Mechanical Engineering Department Research

Thermo-Fluid

Research Group Members

• Prof. Dr. Hojin Ahn (Erdem An)
• Assoc. Prof. Ali Bahadır Olcay

Thesis Students

• Murat Kahraman (PhD) - Works at Tübitak MAM.
• Ahmet Çağrı Develi (PhD) - Works at GE Aviation company.
• Ahmet Refik Özdemir (PhD) - Works at Arçelik company.
• Sevil İncir (PhD) - Works at Arçelik company.
• Işıl Hergenç - (PhD) - Works at Arçelik company.
• Nihan Uçar (PhD) - Works at Alarko company. 
• Ergin Bayrak (PhD) - Works at Alanya Alaaddin Keykubat University. 
• Hasan Kalkan (PhD) - Works at Yeditepe University as research assistant.
• Sungur Kaan Gökbulak (MSc) - Works at GE Aviation company.
• Emre Can Dokuyucu (MSc) - Works at Yeditepe University as MSc. scholar.
• Metin Mehel (MSc) - Works at TEI company.
• Görkem Güçlü (MSc) - Works at Tübitak project as research scholar.
• Onur Mutlu (Msc) - Works at Tübitak project as research scholar.
• Oğuzhan Gökkaya (MSc) - Works at  Yeditepe University as MSc. scholar.
• Batuhan Topçu (MSc) - Works at ISELKO Heating Cooling Ind. Ltd. Co.
• Burhan Gül (MSc) - Works at İstanbul Metropolitan Municipality / Istanbul Computing and Smart City Technologies Inc.
• Egemen Onan (MSc) 

Projects

• Modeling of Internal Carotid Artery Aneurysms with Computational Fluid Dynamics Using Cerebral Angiographic Image Data Before and After Treatment
• The Effect of Heat Exchanger Blade Geometries on Thermal and Hydraulic Performance
• Development of Precision Computational Diagnostic Techniques for Aortic Heart Valve Defects
• Mechanical Fish Learning to Swim from squid

Biomechanics

Research Group Members

• Prof. Mehmet Akgün
• Asst. Prof. Namık Çıplak
• Asst. Prof. Fethi Okyar
• Assoc. Prof. Bahadır Olcay
• Assoc. Prof. Koray Şafak

Thesis Students

• Volkan Karadağ (PhD)
• Oğulcan Güldeniz (MSc)

Projects

• Finite Element Analysis of the Lumbar Spinal Column
• Research on Fiber Reinforced Viscoelastic Composites
• Determining the Physical Boundaries of Tendon/Ligament Areas on Contractile Media by Optimization
• Parametric CAD Modeling of the Lumbar Spinal Column
• Parametrik Omurga Modelleme Platformu

Publications

• Abstract: For those studying the biomechanical response of the lumbar spine, anatomical meshes obtained from medical imaging data is quite important. However, such models are generally fixed and can only represent a single subject’s geometry. The objective of this study was to improve our previous lumbar vertebral CAD model such that the parameters are now extracted from the CT scan using a semi-automatic procedure. To illustrate the procedure, first, the transverse cross-sections of vertebral bodies were obtained from an individual at three levels, superior, middle and inferior. Parametric contour curves were fitted onto the vertebral body boundaries using an optimization procedure and the fitting errors are reported here. Five lumbar vertebral bodies were then formed using the lofting operation. Hausdorff distance between the CAD and segmentation models was used to assess the accuracy of the resulting models. The means and standard deviations of Hausdorff distances are also reported here. The adopted optimization process was observed to be resulting coefficient of determination values as high as 0.978. Our new model is expected to lead to dramatic reductions in both time and effort required to build a patient-specific biomechanical model.

  Keywords: Parametric model Segmentation Patient specific Lumbar spine Vertebral parameters Spinal curve Medical image processing 

Mechatronics

Research Group Members

• Asst. Prof. Koray K. Şafak
• Asst. Prof. Namık Çıplak
• Asst Prof. Onur Cem Namlı
• Assoc. Prof. Nezih Topaloğlu

Thesis Students

• Can Polay Çıgay (PhD)
• Cevat Volkan Karadağ (PhD)

Projects

• Gait Analysis
• Development of an Indoor Navigation Application/Device
• Literature Survey on Legged Robotics

ME 492 Projects

Fall 2019

• Design of a Height Adjustable Washbasin
• Design of a Hydro Abrasion Test Machine
• Finite Element Analysis of Shape Memory Alloy Based Bending Actuator
• Physical Activity Recognition Using Smartphone Sensors
• Numerical Modelling of Non-Newtonian Fluid Flow
• Mechanical Analysis of Recurved, Composite Bow
• Design of A Linear-To-Rotary Motion Converter for Vibration Energy Harvester Applications
• Research on Fiber Reinforced Viscoelastic Composites
• Finite Element Analysis of the Lumbar Spinal Column
• Controlling The Exit Temperature of Fluid Flow Through a Pipe
• Prototyping of A Flexible, Wearable, and UV-Curable Resin Based Cast Design For Support Of Broken Bones
• Transmissibility Due To Base Excitation In Two Coordinates

Spring 2019

• Finite Element Analysis of a Permanent Based Magnet Vibration Energy Harvester
• Experimental Analysis of Stress Distribution on Tip Loaded Cantilever Beams
• Material Characterization of a UV-Curable Resin
• A New Blade Design for Rotating-Wing Air Vehicles
• Design and Construction of a Tensile Testing Device for Fibrous Materials
• Concept Design of a Very Light Aircraft
• Two-Dimensional Diverterless Supersonic Inlet Design
• Conceptual Design, Production and Testing of an Unmanned Electric Air Vehicle
• Indoor Navigation
• Design and Construction of an Inchworm Robot
• Design and Testing of a Regenerator for a Thermal Engine
• Design and Modelling of an Ejector Pump
• Mode Shape Identification using a Displacement Sensor
• Vehicle Performance Simulation for Eco Shell Marathon
• Electric Vehicle Battery Thermal Management System Simulation
• Natural Convection Experiment on a Wire In Water by Determining the Temperature Coefficient of Resistance of Nichrome Wires
• Turbulent Velocity Profile Using the Law of The Wall
• Design of a Convective Heat Transfer Experiment Setup for Water Flow in a Tube
• Performing Troubleshooting, Testing and Verificaton on a Termodynamicaly Open System
• Designing and Building of a Thermodynamicaly Closed System Experimental Apparatus
• Numerical Investigation on Thermal-Fluid Characteristics of Horizontal and Vertical Upward and Downward Supercritical CO2 Flow Through Rectangular Microchannels
• Effect of Different Coolant Conditions on the Tool Wear, Surface Roughness and Chip Formation for Turning Operations of AlSI 304 Stainless Steels
• Design of Hot Press Machine for Polymeric Test Samples
• Effect of Impact Modifiers on the Mechanical Properties of Glass Fiber Reinforced Composites
• Design of a Corrosive Fatigue Test Machine
• Design of a Brake Lining Test Machine
• Determining the Physical Boundaries of Tendon/Ligament Areas on Contractile Media by Optimization
• Research on Fiber Reinforced Viscoelastic Composites
• Finite Element Analysis of the Lumbar Spinal Column
• Design and Construction of a Vibration Isolator Inspired By a Kangoroo

Fall 2018

• Blade Shape Optimization for Cooling Fans
• Design of a Corrosive-Fatigue Test Machine
• Design of a Blender Machine for Preparing Animal Feed for Bovine
• Design of A Fan with Morphing Blade with The Help of SMA Wire
• A New Blade Design for Rotating-Wing Air Vehicles
• Design of a Resin Fastener
• Simulation of an autonomous bicycle
• Gait Analysis
• Prototype Production Of An Adaptive Headlight System For Motorcycles
• Design and Construction of a Vibration Isolator Inspired By a Kangoroo
• Design and Construction of a Quasi-Zero-Stiffness Vibration Isolator of a Small Size
• Mode Shape Identification Using a High Speed Camera
• Mode Shape Identification using a Displacement Sensor
• Natural Convection Experiment on a Wire in Water by Determining the Temperature Coefficient of Resistance of Nichrome Wires
• Hydrodynamic Interactions Between Successive Grooves in a Corrugated Channel Flow
• Verification of the Contractile Behaviour Of a Fiber Embedded Muscle Finite Element Model
• Finite Element Analysis of The Lumbar Spinal Column
• Progamming a Software for Pressure Drop Calculations of Various Piping Systems as a Mobile App
• Designing and Building of a Thermodynamicaly Open System Experimental Apparatus
• Thermodynamic Analysis of Blockchain System

Spring 2018

• Design of a Solar Residential System
• Design of a Solar Car Charging Station
• Robotic Surface Roughness Measurement
• Literature Survey on Legged Robotics
• Gait Analysis
• Development of an Indoor Navigation Application/Device
• Investigation of an Evaporator Distributor with CFD
• Adsorption Heat Pump
• Design and Fabrication of a Fixture for Laser Displacement Sensor
• Monte Carlo Method to Calculate View Factors for Radiation Exchange
• Optimization of a Dryer Performance
• Investigation of the Mass Transfer Rate of a Wet Towel
• Improvement and Construction of a Four-Legged Locomotion Mechanism
• Design and Fabrication of a Cantilever Beam with Movable Vibration Axis and End Mass Position
• Literature Survey on Human Energy Harvesting Devices
• Analysis of Piezoelectric Energy Harvesters with Varying Width Profiles
• Design of a Gyroscopically Mounted Anti-vibration box to Transport Delicate Matter
• Design of an Anti-vibration box to Transport Delicate Matter
• Sweeping the Harmonic Frequency Response of a Cantilever Plate subjected to Base Excitation
• Verification and Validation of the Contractile Behaviour of a Computational Muscle Model
• Vertical Axis Wind Turbines with Variable Blade Sections
• Adaptive Headlight Design for Motorcyles
• Wind shield viper design based on air-flow analysis
• Designing and Building of a Peltier Module Experimental Apparatus
• Experimental Study of an Evaporator Distributor
• Performance Evaluation and Troubleshooting of an Air-handling Unit
• Parametric CAD Modeling of the Lumbar Spinal Column

​Fall 2017

• DYNAMICAL MECHANICAL CHARACTERIZATION OF BIOLOGICAL TISSUES
• SYSTEM DYNAMICS AND STABILITY ANALYSIS OF A REMOTELY PILOTED HOVERCRAFT UNDER A FEEDBACK CONTROL SYSTEM (IN CONJUNCTION WITH PROPERF)
• ESTIMATION AND MEASUREMENT OF PROPELLER PERFORMANCE/THRUST OF A HOVERCRAFT (IN CONJUNCTION WITH HOVSTA)
• OPTIMIZATION OF A STRUCTURAL PART
• EXPERIMENTAL STUDY OF AN EVAPORATOR DISTRIBUTOR
• TROUBLESHOOTING OF AN AIR HANDLING UNIT
• DESIGN OF FREE CONVECTION TEST SETUP
• MONTE CARLO METHOD TO CALCULATE VIEW FACTORS FOR RADIATION EXCHANGE
• ENERGY HARVESTING PERFORMANCE OF TAPERED CANTILEVER BEAMS
• DESIGN OF AN IN-PLANE BIDIRECTIONAL ELECTROTHERMAL MICROACTUATOR
• DEVELOPMENT OF INDOOR NAVIGATION APPLICATION
• DEVELOPMENT AND TESTING OF AN IN-SHOE PRESSURE SENSING APPARATUS
• EXPERIMENTAL VERIFICATION OF IDEAL STRING VIBRATIONS
• MEASURING ELECTRICAL RESISTANCE FLUCTUATIONS OF A VIBRATING STRING
• ADDITION OF CHESS PLAYING FEATURE TO AN EXISTING ROBOT
• FINITE ELEMENT ANALYSIS OF INDENTATION RECOVERY DUE TO SHAPE MEMORY EFFECT

Journal Papers

• Unal, E., Ahn, H. and Sorguven E., Experimental Investigation on Flows in a Corrugated Channel, ASME J. Fluids Eng ; doi:10.1115/1.4032754, 2016.
• Sivas, D., Olcay, A.B. and Ahn, H., 2016, "Investigation of a corrugated channel flow with an open-source PIV software," EDP Sciences, 114, 02107, DOI: 10.1051/epjconf/201611402107.
• Ahn, H., Wave Propagation in Rapid Granular Flows, Journal of Applied Mechanics, 80, No.5, 051008, DOI: 10.1115/1.4023538, 2013.
• Ahn, H., Basaranoglu, Z., Yilmaz, M., Bugutekin, A., and Gul, M. Z., Experimental Investigation of Granular Flow Throughan Orifice. Powder Technology, 186, 2008, 65-71. 
• Ahn, H., Computer Simulation of Rapid Granular Flow Through an Orifice, Journal of Applied Mechanics, 74, 2007, 111-118. 
• Ahn, H., Brennen, C. E. and Sabersky, R. H., "Analysis of the Fully Developed Chute Flow of Granular Materials", Journal of Applied Mechanics, 59, 1992, 109-119. 
• Ahn, H., Brennen, C. E. and Sabersky, R. H., "Measurements of Velocities, Velocity Fluctuations, Density, and Stresses for Chute Flows of Granular Materials", Journal of Applied Mechanics, 58, 1991, 792-803.
• Matthys, E. F., Ahn, H. and Sabersky, R. H., "Friction and Heat Transfer Measurements for Clay Suspensions with Polymer Additives", Journal of Fluids Engineering, 109, 1987, 307-312. 
• Papila, M. and Akgün, M. A., "Post-Buckling of Composite I-Sections, Part 1: Theory", J. of Composite Materials, 35, 2001, 774-796.
• Papila, M., Akgün, M. A., Xiaokai, N. and Ifju, P., "Post-Buckling of Composite I-Sections, Part 2: Experimental Validation", J. of Composite Materials, 35, 2001, 797-821.
• Akgün, M. A., Garcelon, J. H. and Haftka, R. T., "Fast Exact Linear and Nonlinear Structural Reanalysis and the Sherman-Morrison-Woodbury Formulas", Int. J. for Numerical Methods in Engineering, 50, 2001, 1587-1606.
• Akgün, M. A., Haftka, R. T., Wu, K. C., Walsh, J. L. and Garcelon, J., "Efficient Structural Optimization for Multiple Load Cases Using Adjoint Sensitivities ", AIAA Journal, 39(3), 2001, 511-516.
• Liu, B., Haftka, R. T., Akgün, M. A. and Todoroki, A., "Permutation Genetic Algorithm for Stacking Sequence Design of Composite Laminates", Computer Methods in Applied Mechanics and Engineering, 186 (2-4), 2000, 357-372.
• Liu, B., Haftka, R. T. and Akgün, M. A., "Two-Level Composite Wing Structural Optimization Using Response Surfaces", Structural (and Multidisciplinary) Optimization, 20, 2000, 87-96. 
• Mutlu, O., Olcay, A. B., Bilgin, C. and Hakyemez, B., “Evaluating the Effect of the Number of Wire of Flow Diverter Stents on the Nonstagnated Region Formation in an Aneurysm Sac Using Lagrangian Coherent Structure and Hyperbolic Time Analysis,” World Neurosurgery, accepted, 2019.
• Kahraman, M., Olcay, A. B. and Sorguven, E. “Thermodynamic and thermoeconomic analysis of a 21 MW binary type air-cooled geothermal power plant and determination of the effect of ambient temperature variation on the plant performance,” Energy Conversion & Management, vol. 192, p. 308 - 320, 2019.
• Mutlu, O., Olcay, A. B., Bilgin, C. and Hakyemez, B., “Evaluating the effectiveness of two different flow diverter stents based on the stagnation region formation in an aneurysm sac using lagrangian coherent structure,” World Neurosurgery, vol. 127, p. 727-737, 2019.
• Varıcıoğlu, G.S., Ethemoğlu, S., Olcay, A. B., Yılmaz, B. and Özilgen, M. “Thermodynamic assessment of the use of alternative metabolic energy resources on work performance efficiency of spontaneous rat myometrium contractions,”  International Journal of Exergy, vol. 30, No. 1, p. 1 - 25, 2019.
• Olcay, G. A., Öner, M. A., Olcay, A. B. “A Conceptual View of Exergy Destruction in Mergers and Acquisitions,” Technological Forecasting & Social Change, vol. 143 p. 336 - 352, 2019.
• Bayrak, E., Olcay, A. B., Serincan, M. F. “Numerical investigation of the effects of geometric structure of microchannel heat sink on flow characteristics and heat transfer performance,” International Journal of Thermal Sciences, vol. 135, p. 589-600, 2018.
• Olcay, A. B. , Amindari, A., Kirkkopru, K., Yalcin, H. “Characterization of disturbed hemodynamics due to stenosed aortic jets with a Lagrangian Coherent Structures technique,”  Journal of Applied Fluid Mechanics, vol. 11, No. 2, p. 375-384, 2018.
• Okbaz, A., Pinarbasi, A., Olcay, A. B. and Aksoy, M. H. “An experimental, computational and flow visualization study on the air-side thermal and hydraulic performance of louvered fin and round tube heat exchangers,” International Journal of Heat and Mass Transfer, vol. 121, p. 153-169, 2018.
• Çatak, J., Özilgen, M., Olcay, A. B., Yılmaz, B. “Assessment of the work efficiency with exergy method in aging muscles and healthy and enlarged hearts,” International Journal of Exergy, vol. 25, No. 1, p. 1-33, 2018.
• Bilen, K., Gok, S., Olcay, A. B., Solmus, I. “Investigation of The Effect Of Aluminum Porous Fins On Heat Transfer,” Energy, vol. 138, p. 1187-1198, 2017.
• Olcay, A. B., Avci, P., Bayrak, E., Dalkılıç, A. S., Wongwises, S. “Experimental Investigation of Frost Issue on Various Evaporators Having Different Fin Types,” International Communications in Heat and Mass Transfer, vol. 86, p. 190-198, 2017.
• Olcay, A. B., Malazi, M. T. Okbaz, A., Heperkan, H., Firat, E., Ozbolat, V. Gokcen, M. G., Sahin, B. “Experimental and Numerical Investigation of a Longfin Inshore Squid’s Flow Characteristics,” Journal of Applied Fluid Mechanics, vol. 10, No. 1, p. 21-30, 2017.
• Yayla, S., Ibrahim, S.S. and Olcay, A. B. “Numerical investigation of coalescing plate system to understand the separation of water and oil in water treatment plant of petrolum industry,” Engineering Applications of Computational Fluid Mechanics, vol. 11, p. 184 - 192, 2017.
• Olcay, A. B. and Malazi, M. T. “The effects of a longfin inshore squid's fins on propulsive efficiency during underwater swimming,” Ocean Engineering, vol. 128, p. 173-182, 2016.
• Olcay, A. B., Kahraman, M. and Ataş, S. “Numerical and experimental investigation of a pulverized coal mill duct system in the Soma B Thermal Power Plant by plant performance tests,” Journal of Science and Technology, 36, 2, 135-146, 2016.
• Yalçınkaya, B. H., Erikli, Ş., Özilgen, B. A., Olcay, A. B., Sorgüven, E., Özilgen, M., “Thermodynamic analysis of the squid mantle muscles and giant axon during slow swimming and jet escape propulsion,” Energy, vol. 102, p. 537 - 549, 2016.
• Olcay, A. B., “Investigation of a wake formation for flow over a cylinder using lagrangian coherent structures,” Progress in CFD, vol. 16, p. 126 - 130, 2016.
• Tabatabaei, M. M. and Olcay, A. B., “Investigation of a longfin inshore squid's swimming characteristics and an underwater locomotion during acceleration,” Applied Ocean Research, vol. 55, p. 76 - 88, 2016.
• Tabatabaei, M. M., Okbaz, A., Olcay, A. B., “Numerical investigation of a longfin inshore squid's flow characteristics,” Ocean Engineering, vol. 108, p. 462 - 470, 2015.
• Olcay, A. B., Pottebaum, T. S. and Krueger, P. S., “Sensitivity of LCS identification to flow field resolution and random errors,” Chaos, vol. 20, 017506, 2010.
• Olcay, A. B. and Krueger, P. S., “Momentum evolution of ejected and entrained fluid during laminar vortex ring formation,” Theoretical and Computational Fluid Dynamics, vol. 24, p. 465 - 482, 2010.
• Olcay, A. B. and Krueger, P. S., “Measurement of ambient fluid entrainment during vortex ring formation,” Experiments in Fluids, vol. 44, p. 235-247, 2008.
• Saniei, N., Erturan, E. D. and Olcay, A. B., “Heat transfer augmentation of a co-rotating disk assembly-emphasis on the lower disk,” Journal of Heat Transfer Engineering, vol. 25, no. 4, p. 80-89, 2004.
• Olcay, A. B. and  Develi, A. Ç., “Hidrodinamik yağlamada kullanılan mikro-doku yüzeyler üzerinde akışkanın, diskin açısal hızının ve boşluk sayısının direnç azalmasına etkilerinin sayısal incelenmesi,” Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, Cilt 21, Sayı 5, DOI: 10.16984/saufenbilder.296712, 2017.
• Olcay, A. B., Ural, O. F., Süslü, B., Hakyemez, B., “Beyin Anevrizmalarının Hemodinamik Yapılarının Kanın Newton Tipi ve Newton Tipi Olmama Durumlarının Hesaplamalı Akışkanlar Dinamiği ile İncelenmesi,” Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi, DOI: 10.19113/sdufbed.20794, 2017.
• Yayla, S., Ibrahim, S.S. and Olcay, A. B. “CFD simulation of designed coalescing plates to seperating water and oil in water treatment plants used petroluim projects,” Pamukkale University Journal of Engineering Sciences, DOI: 10.5505/pajes.2016.67944, 2016.
• Okbaz, A., Onbaşıoğlu, H., Olcay, A. B., Pinarbasi, A. “Panjur kanatlı ısı değiştiricilerinin performansının deneysel ve hesaplamalı akışkanlar dinamiği yaklaşımı ile incelenmesi,” Mühendis ve Makina, vol. 58, no. 687, pp. 41-55, 2017.
• Olcay, A. B. “Kalamardan Yüzme Öğrenen Mekanik Balıklar,” Tübitak - Bilim ve Teknik Dergisi, Sayı 587, p. 36 - 37, 50. Yıl, Ekim, 2016.
• Yayla, S., Yaseen, S. and Olcay, A. B. “Numerical investigation of cavitation on different venturi models,” Yuzuncu Yil University Journal of Institute of Natural & Applied Sciences,  20 (1-2) 22-33, 2015.
• Şafak, K.K., “Dynamics, stability and actuation methods for powered compass-gait walkers”, Turkish Journal of Electrical Engineering & Computer Sciences, vol. 22, n. 6, 2014
• Bozkurt, S., Safak, K.K., “Evaluating the Hemodynamical Response of a Cardiovascular System under Support of a Continuous Flow Left Ventricular Assist Device via Numerical Modeling and Simulations”, Computational and Mathematical Methods in Medicine, Article Number: UNSP 986430, 2013.
• Şafak, K.K., Adams, G.G., “Dynamic Modeling and Hydrodynamic Performance of Biomimetic Underwater Robot Locomotion”, Autonomous Robots, v. 13, n. 3, pp. 223-240, 2002.
• Şafak, K.K., Adams, G.G., “Modeling and Simulation of an Artificial Muscle and its Application to Biomimetic Robot Posture Control”, Robotics and Autonomous Systems, v. 41, n. 4, pp. 225-243, 2002.
• Şafak, K.K., Türkay, O.S., “Experimental Identification of a Universal Motor Dynamics Using Neural Networks”, Mechatronics, v. 10, n. 8, pp. 881-896, 2000.
• C. V. Karadag and N. Topaloglu, "A self-sufficient and frequency tunable piezoelectric vibration energy harvester," Journal of  Vibration and Acoustics, Vol. 139(1), 011013-011013-8.
• A. A. Aksekili and N. Topaloglu, "Design and Experimental Verification of Position Dependent Passive Electromagnetic Damping," Journal of Dynamic Systems, Measurement and Control, Vol. 138(6), March 2016, 061003.
• N. Topaloglu, P. M. Nieva, M. Yavuz and J. P. Huissoon, "An Effective Thermal Conductance Tuning Mechanism for Uncooled Microbolometers", Infrared Physics & Technology, Vol. 57, March 2013, pp. 81–88.
• N. Topaloglu, P. M. Nieva, M. Yavuz and J. P. Huissoon, "Modeling of Thermal Conductance in Uncooled Microbolometer Pixel", Sensors and Actuators A: Physical, Vol. 157(2), February 2010, pp. 235-245.
• C. Elbuken, N. Topaloglu, P. M. Nieva, M. Yavuz and J. P. Huissoon. “Modeling and analysis of a 2-DOF bidirectional electro-thermal actuator,” Microsystem Technologies, Vol. 15(5), May 2009, pp. 713-722.
• Okyar, F., Karadag, V., Akgun, M., Ciblak, N., "Leveraging artificial neural networks to mesh frog gastrocnemius muscle from digital photography", Computer Methods in Biomechanics and Biomedical Engineering: Imaging and Visualization, (2019).
• Fethi Okyar, Ogulcan Guldeniz & Basar Atalay, "A holistic parametric design attempt towards geometric modeling of the lumbar spine", Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization, (2019).
• Bayoglu, R., Okyar, A.F., "Implementation of boundary conditions in modeling the femur is critical for the evaluation of distal intramedullary nailing", Medical Engineering and Physics, (2015) 37 (11), pp. 1053-1060.
• Okyar, A.F., Uzunsoy, D., Ozsoy, B., "Comparison of fatigue crack growth rate of selective laser sintered RapidSteel via computational fracture mechanics", International Journal of Materials Research, (2014) 105 (6), pp. 552-556.
• Okyar, A.F., Bayoglu, R., "The effect of loading in mechanical response predictions of bone lengthening", Medical Engineering and Physics, (2012) 34 (9), pp. 1362-1367.
• Bekler, H., Bulut, G., Usta, M., Gokce, A., Okyar, F., Beyzadeoglu, T., "The contribution of locked screw-plate fixation with varying angle configurations to stability of osteoporotic fractures: An experimental study", Acta Orthopaedica et Traumatologica Turcica, (2008) 42 (2), pp. 125-129.
• Gosz, M., Okyar, A.F., Nair, S., "A crack driving force criterion for the prediction of interface crack kinking in thin-film composites", Interface Science, (2003) 11 (3), pp. 329-338.
• Okyar, A.F., Gosz, M., "Finite element modeling of a microelectronic structure under uniform thermal loading", Finite Elements in Analysis and Design, (2001) 37 (11), pp. 961-977.
• Gosz, M., Okyar, A.F., "Analysis of interfacial fracture in thin films subjected to thermal loading", American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, (1999) 398, pp. 145-151.
• Gosz, M., Okyar, A.F., "Effect of diffusionally accommodated interfacial sliding on the stress and deformation in copper/polyimide high density interconnects", Mechanics of Materials, (1999) 31 (5), pp. 317-329.
• 2013, “Variable Tension, Large Deflection Ideal String Model For Transverse Motions,” arXiv. arXiv:1310.1019 [physics.gen-ph].
• 2012, “Design, Manufacturing, and Testing of an Autonomous Waste Sorter for Residential Use”, Int. Conference on Recycling and Reuse, Istanbul, Turkey.
• 2010, “Workspace Optimization Of A Six Degrees Of Freedom Parallel Manipulator For Micromachining”, ESDA 2010, Istanbul, TURKEY
• 2010, “An Investigation Of Microstructure And Mechanical Properties Of Aluminum Matrix Composites Reinforced With B4C Particulates Manufactured By Powder Metallurgy Method”, World PM 2010, Florence, ITALY.
• 2008, “Modeling and Control of a Parallel Robot”, 50. Otomatik Kontrol Ulusal Toplantısı (TOK), Istanbul, Turkey.
• 2007, “Determining the Angular Motion of a Rigid Body Using Linear Accelerometers Without Integration”, 3rd Int. Conference on Recent Advances in Space Technologies, Istanbul, Turkey.
• 2007, “Development of the First Implantable Axial Left Ventricular Assist System in Turkey”, 13th Biomedical Science and Technology Symposium (BIOMED-2007), Istanbul, Turkey.
• 2003. "Design and Analysis of Remote Center of Compliance Structures," Journal of Robotic Systems, v. 20, pp. 415-427.

Conference Papers

• Ergin BAYRAK, Ali Bahadır OLCAY, Hojin AHN, Oğuzhan GÖKKAYA, Numerical investigation on thermofluid characteristics of vertical upward supercritical CO2 laminar flow through a circular microchannel, Proceedings of 22nd Ulusal Isı Bilimi ve Tekniği Kongresi (ULIBTK), Kocaeli, 11-14 September 2019.
• Sivas, D., Olcay, A.B., Ahn, H., Investigation of a corrugated channel flow with an open-source PIV software, Experimental Fluid Mechanics Conference, Prague, Czech Republic, 2015.
• Ahmet Cagri Develi and Hojin Ahn, 2015, Experimental Investigation on Friction and Acoustics in Corrugated Pipes, International Conference on Advances in Mechanical Engineering, Istanbul 2015 – ICAME2015-298.
• Hojin Ahn, Burhan Gul, Yavuz Sahin and Onur Hartoka, Experimental Investigation on the Condensation Efficiency of Humid Air in a Cross-Flow Condenser, Proceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE2013-64331, 2013, San Diego, USA.
• Hojin Ahn, Ibrahim Uslu, Experimental Investigation on Pressure Drop in Corrugated Pipes, Proceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE2013-66061, 2013, San Diego, USA.
• Efe Unal, Esra Sorguven and Hojin Ahn, Computational Investigation of Vortex Structure in the Corrugated Channel, Proceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE2013-66062, 2013, San Diego, USA.
• Efe Unal, Hojin Ahn and Esra Sorguven, Experimental Investigation of Vortex Structure in the Corrugated Channel, Proceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE2013-66063, 2013, San Diego, USA.
• Burhan GÜL , Hojin AHN, Yavuz ŞAHİN, Onur HARTOKA, Kondanser Kanal Boyutlarının Havada Bulunan Su Buharının Yoğuşmasına Etkilerinin Deneysel Araştırılması, Proceedings of 19th Ulusal Isı Bilimi ve Tekniği Kongresi (ULIBTK), Samsun, Turkey, ULIBTK13-037, 848-853.
• H. Ahn, Numerical Analysis of Convective Heat Transfer to Granular Flow, Proceedings of 18th Ulusal Isı Bilimi ve Tekniği Kongresi (ULIBTK), Zonguldak, Turkey, September 2011, ULIBTK2011-143. 
• Selim Bozkurt, Koray K. Safak, Esra Sorguven, Suha Kucukaksu, Namik Ciblak, A. Fethi Okyar, Mehmet A. Akgun, Hojin Ahn, Nilufer Egrican and Ismail Lazoglu, Sol Karıncık Destek Cihazları İçin Kontrol Yöntemleri,  Control Strategies for the Left Ventricular Assist Devices, 48, BIYOMUT 2009. 
• Kocatepe, Y., Ahn, H., Aydın, C., Karacasu, A., Experimental investigation of a heat exchanger with a helical coil made of corrugated tubes, Proceedings of 17th Ulusal Isı Bilimi ve Tekniği Kongresi (ULIBTK), Sivas, 24-27 June 2009, ULIBTK09-ISI-082. 
• H. Ahn, E. Yılmaz, M. Yılmaz, A. Büğütekin, Discharge of Granular Materials from Hoppers with Various Exit Geometries, Proceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE2007-41804, 2007, Seattle, USA. 
• Sorguven, E., Ciblak, N., Okyar, A.F., Akgun, M.A., Egrican, A.N., Safak, K.K., Ahn, H., Lazoglu, I., Kucukaksu, S., Flow simulation and optimization of a left ventricular assist device, ASME International Mechanical Engineering Congress and Exposition, IMECE2007-41747, 11-15 November 2007, Seattle, USA . 
• Ciblak, N., Okyar, A.F., Sorguven,E., Akgun, M.A., Kucukaksu, S., Ahn, H., Safak, K.K., Egrican, N., Ozsoy, B., Yenigul, O., Sehirlioglu, M., Lazoglu, I., Budak, E., Analysis and development of Heart Turcica Axial: Development of the first implantable axial left ventricular assist system in Turkey, 1. Ulusal Yapay Organlar ve Destek Sistemleri Kongresi, 15-17 June 2007, Istanbul, Turkey. 
• Lazoglu, I., Demir, O., Yildiz, G., Kucukaksu, S., Okyar, A.F., Cıblak, N., Akgun, M., Sorguven, E., Ahn, H., Safak, K.,Egrican, N., From Concept to the Prototype of Heart Turcica Centrifugal: Development of the First Implantable Centrifugal Left Ventricular Assist System in Turkey, 1. Ulusal Yapay Organlar ve Destek Sistemleri Kongresi, 15-17 June 2007, Istanbul, Turkey.
• Küçükaksu, S., Göksedef, D., Bülbül, S., Yıldız, C.E., Çıblak, N., Lazoğlu, I., Sorgüven Öner, E., Akgün, M., Okyar, A.F.,Şafak, K.K., Ahn, H., Şehirlioğlu, M., Uçak, C., Eğrican, N., The prototype of the first Turkish axial pump for the treatment of end-stage cardiac failure, International Society for Rotary Blood Pumps (ISRBP) 14th Congress, 31 August-2 September 2006, Leuven, Brussels. 
• Ahn, H., An Implicit Method for Numerically Stiff Venting Problems in Honeycomb and Other Multicell Configurations, AIAA-94-2361, 25th AIAA Fluid Dynamics Conference, 1994. 
• Ruth, E. K., Ahn, H., Baker, R. L. and Brosmer, M. A., Advanced Liquid Rocket Engine Transient Model, AIAA-90-2299,26th AIAA/ASME Joint Propulsion Conference, 1990. 
• Ahn, H., Brennen, C. E. and Sabersky, R. H., Experiments on Chute Flows of Granular Materials, Proceedings of the US-Japan Seminar on Micromechanics of Granular Materials, 1987, Sendai-Zao, Japan. 
• Matthys E.F., H. Ahn, and R.H. Sabersky. 1986. Experimental heat transfer and friction results for clay suspensions and their combination with polymers, International Symposium on Slurry Flows,1986, Vol. FED-38, pp. 203-209. New York: American Society of Mechanical Engineers. 
• Mehmet A. Akgün, Cem Tutcu, Anıl Özdemirli, "Design of a Live-Muscle-Tissue-Actuated Mechatronic Device", poster, 7th World Congress of Biomechanics (WCB2014), 6-11 July 2014, Boston, USA
• Cem Tutcu, Mehmet A. Akgün, Anıl Özdemirli, Yalçın Günal, "Characterization of Animal Muscles as Actuators for Bio-Mechatronic Systems", poster, XXIV Congress of the International Society of Biomechanics (ISB2013), 4-9 August 2013, Natal, Brazil
• Akgün, M. A., Tutcu, C., Okumus, B. C. Cıblak, N., “Design and Construction of an Unmanned Air-Cushion Vehicle for Minesweeping”, CD of Proceedings, 6th Ankara International Aerospace Conference, 14–16 September 2011, METU, Ankara, Turkey.
• Akgün, M. A. and Ünlü, U. M., “Numerical and Experimental Investigation of Composite Plates with Internal Ply-Drop”, CD of Proceedings, The 13th International Conference on Machine Design and Production (UMTIK 2008), 3-5 September 2008, Istanbul, Turkey.
• Akgün, M. A. and Ünlü, U. M., “Numerical and Experimental Investigation of Composite Plates with Internal Ply-Drop”, CD of Proceedings, The 13th International Conference on Machine Design and Production (UMTIK 2008), 3-5 September 2008, Istanbul, Turkey.
• Sökmen, Ö. and Akgün, M. A., “Structural Optimization of a Composite Wing Under Four Different Flight Conditions”, CD of Proceedings, Session 1a, International Conference on Modelling and Optimization of Structures, Processes and Systems (ICMOSPS ’07), 22-24 January 2007, Durban, South Africa.
• Akgün, M. A., Kavukcuoglu, K. and Oktay, E., “An Uncoupled Procedure for Wing Flutter Analysis”, CD of Proceedings, Paper No: AIAC-2005-089, Ankara International Aerospace Conference, 22-25 August 2005, Ankara, Turkey.
• Sümer, B., Akgün, M. A. and Tuncer, I., “A Computational Static Aeroelastic Analysis Procedure For Aircraft Wings”, CD of Proceedings, Paper No: AIAC-2005-085, Ankara International Aerospace Conference, 22-25 August 2005, Ankara, Turkey.
• Acar, E., Kale, A. A. and Akgün, M. A., “Reliability-Based Design and Inspection Scheduling Optimization of an Aircraft Structure Containing Multiple Site Damage”, New Trends in Fatigue and Fracture IV (NT2F4), 10-12 May 2004, Aleppo, Syria, CD of Proceedings.
• Acar, E. and Akgün, M. A., "Life Assessment of a Jet Engine Component", paper no: 399 on CD of proceedings, International Conference on Computational & Experimental Engineering & Sciences, ICCES, 2003, 24-29 July 2003, Corfu, Greece; CD of Proceedings.
• Akgün, M. A., “A Nonlinear Structural Reanalysis Method Based on the Sherman-Morrison-Woodbury Formulas”, CD of Proceedings, Fourth World Congress of Structural and Multidisciplinary Optimization, 4-8 June 2001, Dalian, China, CD of Proceedings.
• Akgün, M. A. and Haftka, R. T., "Damage Tolerant Topology Optimization Under Multiple Damage Configurations", Topology Optimization of Structures and Composite Continua, NATO ARW, 8-12 May 2000, Budapest, Hungary; proceedings published by Kluwer Academic Publishers as Vol. 7 of sub-series Mathematics, Physics and Chemistry in NATO Science Series, eds., G. I. N. Rozvany and N. Olhoff, 2000, 317-325.
• Akgün, M. A. and Haftka, R. T., "Damage Tolerant Topology Optimization Under Multiple Loas Cases", AIAA paper no: 2000-1389 on CD of proceedings, 41st Structures, Structural Dynamics and Materials Conference, 3-6 April, 2000, Atlanta, GA, USA.
• Rosca, R., Haftka, R.T., Akgün, M. A. and Nikolaidis, E., "Block Toppling Model For Testing Procedures For Design Against Uncertainty", AIAA paper no: 2000-1717 on CD of proceedings, 41st Structures, Structural Dynamics and Materials Conference, 3-6 April, 2000, Atlanta, GA, USA.
• Mutlu O., Olcay, A. B., Bilgin, C. and Hakyemez, B. “Investigation of the effect of flow diverter's pore density on stagnation fluid flow zones inside a giant aneurysm using a lagrangian coherent structure technique,” 15th Congress of the World Federation of Interventional and Therapeutic Neuroradiology, October 21-24, 2019, Naples, Italy.
• Mutlu O., Olcay, A. B., Bilgin, C. and Hakyemez, B. “Understanding the effect of the number of wire on stagnation flow zones inside a giant aneurysm using a computational fluid dynamics technique,” 17th Balkan Congress of Radiology, October 17-19, 2019, Heraklion, Greece.
• Tercanlı, M. F., Mutlu O., Olcay, A. B., Bilgin, C. and Hakyemez, B. “Numerical study of a simplified cerebral aneurysm using a two different flow diverter stent modeling,” Tıp Teknolojileri Kongresi-TIPTEKNO’19, 3-5 Ekim 2019, Kuşadası, Turkey.
• Güçlü, G. Günaydın, M. T., Ünsal, C., Olcay, A. B., Bilgin, C. and Hakyemez, B. “Investigation of Blood Flow Behavior in an Aneurysm Sac Using Computational Fluid Dynamics,” Tıp Teknolojileri Kongresi-TIPTEKNO’19, 3-5 Ekim 2019, Kuşadası, Turkey.
• Tercanlı, M. F., Olcay, A. B., Bilgin, C. and Hakyemez, B. “Investigation of a simplified cerebral aneurysm model with non-Newtonian fluid models for three different aneurysm neck sizes using computational fluid dynamics,” 22nd Congress on Thermal Science and Technology (ULIBTK 2019), 11-14 September 2019, Kocaeli University, Kocaeli, Turkey.
• Ergin, O., Güler, Ü., Olcay, A. B., Bilgin, C. and Hakyemez, B. “Investigation of a simplified cerebral aneurysm model with three most common flow diverter stent models using computational fluid dynamics,” 22nd Congress on Thermal Science and Technology (ULIBTK 2019), 11-14 September 2019, Kocaeli University, Kocaeli, Turkey.
• Bayrak, E., Olcay, A. B., Ahn, H. and Gökkaya, O. “Numerical investigation on thermal-fluid characteristics of horizontal and vertical upward and downward supercritical CO2 flow through circular microchannels,” 22nd Congress on Thermal Science and Technology (ULIBTK 2019), 11-14 September 2019, Kocaeli University, Kocaeli, Turkey.
• Okbaz, A., Sökücü, S., Onbaşıoğlu, H. and Olcay, A. B. “Experimental investigation of evaporators with smooth and inner grooved tubes using CO2 as a refrigerant,” International conference, Ammonia and CO2 Refrigeration Technologies, April 11-13, 2019, Ohrid, Republic of Macedonia.
• Bayrak, E., Tüzün, A. H. and Olcay, A. B. “Recent developments in passive heat transfer enhancement techniques in micro-cooling technology,” International academic research congress, INES 2017, 1376 – 1383.
• Çatak, J., Yılmaz, B., Olcay, A.B., Özilgen, M. “İnsan sağ ve sol ventrikül kaslarında iş, ekserji ve entropinin termodinamik analizi,” Türk Fizyoloji Bilimler Derneği, 43. Ulıusal Fizyoloji Kongresi, Pamukkale Üniversitesi Kongre Merkezi, 7 - 10 Eylül 2017, Pamukkale, Türkiye.
• Sokucu, M.,Unal, M.C.,Olcay, A.B., Onbasıoglu, H. “Numerical investigation on two-phase fluid flow characteristics of evaporator distributor with R404a and R744 refrigerants,” INTERNATIONAL CONFERENCE, Ammonia and CO2 Refrigeration Technologies, May 11-13, 2017, Ohrid, Republic of Macedonia. 
• Okbaz, A., Pinarbasi, A., Onbaşıoğlu, H. and Olcay, A. B. “Panjur kanatlı ısı değiştiricilerinin performansının deneysel ve hesaplamalı akışkanlar dinamiği yaklaşımı ile incelenmesi,” 13. ULUSAL TESİSAT MÜHENDİSLİĞİ KONGRESİ – TESKON - 19-22 Nisan 2017, İzmir, Türkiye.
• Okbaz, A., Pinarbasi, A., and Olcay, A. B. “3D computational analysis of thermal&hydraulic performance of louvered fin heat exchanger with variable louver angle and louver pitch,” Proceedings of the ASME 2016 International Mechanical Engineering Congress and ExpositionICONE14, IMECE 2016, November 11-17, 2016, Phoenix, Arizona, USA.
• Okbaz, A., Olcay, A. B., Cellek, M. S. and Pinarbasi, A., “Computational investigation of heat transfer and pressure drop in a typical louver fin-and-tube heat exchanger for various louver angles and fin pitches,” Experimental Fluid Mechanics Conference, 15th - 18th November 2016, Marianske Lazne, Czech Republic.
• Ural, O. F., Süslü, B., Olcay, A. B. and Hakyemez, B. “Beyin anevrizmalarının hemodinamik yapılarının kanın Newton tipi ve Newton tipi olmama durumlarının hesaplamalı akışkanlar dinamiği ile incelenmesi,” XX. Biyomedikal Mühendisliği Ulusal Toplantısı, 3-5 Kasım, İzmir, Türkiye.
• Bilen, K., Gök, S. and Olcay, A. B. “Investigation of the effect of aluminum porous fins on the heat transfer,” 9th International Conference on Sustainable Energy & Environmental Protection 22-25 September 2016, Kayseri-Turkey.
• Yayla, S., Yaseen, S., Olcay, A. B., “CFD simulation for designing two different shapes of the venturi for showing cavitation in two phase flow,” 2nd International Conference on Advances in Mechanical Engineering, ICAME 2016, 10-13 May, 2016, Istanbul, Turkey. 
• Yayla, S., Ibrahim, S.S., Olcay, A. B., “The Separation of Water and Oil in Water Treatment Plant in Petroleum Project Using Coalescing Plate Seperator and CFD Simulation,” International Congress on Engineering and Information, 10-12 May, 2016, Osaka, Japan.
• Erikli, S and Olcay, A. B., “Hidrosiklon Ayırıcılarda Vorteks Yakalayıcı Kanalı Konumunun Ayrıştırma Performansı ve Enerji Verimliliğine Etkilerinin İncelenmesi,” 9. Pompa Vana Kompresör Kongresi, 5-7 Mayıs, 2016, İstanbul, Türkiye.
• Sivas, D., Olcay, A. B., Ahn, H., “Investigation of a corrugated channel flow with an open-source PIV software,” EPJ Web of Conferences, 114, 02107, 2016.
• Süslü, B., Olcay, A. B. and Hakyemez, B., “Examination of Brain Aneurysm based on Computational Fluid Dynamics (CFD) Simulations,” Biomedical Engineering Meeting (BIYOMUT), 19th National, p. 1 - 4, (DOI 10.1109/BIYOMUT.2015.7369450), 2015.
• Erikli, S and Olcay, A. B., “Inlet Diameter and Flow Volume Effects on Separation and Energy Efficiency of Hydrocyclones” IOP Conf. Ser.: Mater. Sci. Eng. 90 012074, London, England, 2015.
• Olcay, A. B., Tabatabaei, M. M., Gokcen, M. G. and Heperkan, H., “Drag force and jet propulsion investigation of a swimming squid,” EPJ Web of Conferences, 92, 02092, 2015.
• Okbaz, A., Olcay, A. B. and Pinarbasi, A., “Numerical Investigation of Fin Rows Number Effects on Thermal and Hydraulic Characteristics of Louvered Fin Heat Exchangers for Experimental Designs,” Experimental Fluid Mechanics Conference, Cesky Krumlov, Czech Republic, 2014.
• Topkara, A., Ökeer, E., Hakyemez, B., Işık, E. Ö. and Olcay, A. B., “Time-of-Flight Manyetik Rezonans Anjiyografi Görüntüleri Üzerinde Hesaplamalı Akışkanlar Dinamiği Simülasyonları,” Biomedical Engineering Meeting (BIYOMUT), 18th National, Boğaziçi Üniversitesi Biyomedikal Mühendisliği Enstitüsü, İstanbul, Türkiye. 
• Tabatabaei, M. M., Olcay, A. B., Gokcen, M. G., Okbaz, A. and Heperkan, H., “Investigation of hydrodynamic drag in a swimming squid,” Suleyman Demirel University, Journal of Engineering Sciences and Design, 2(3),SI:BioMechanics, 287-291, 2014.
• Olcay, A. B., Tabatabaei, M. M., Gokcen, M. G., Okbaz, A. and Heperkan, H., “Understanding flow characteristics of swimming squid using 2D axisymmetric numerical model,” Suleyman Demirel University, Journal of Engineering Sciences and Design, 2 (3), SI:BioMechanics, 293-297, 2014.
• Gokcen, M. G. and Olcay, A. B., “Bir Kalamarın 3-Boyutlu Sonlu Elemanlar Modelinin Bilgisayarlı Tomografi Yardımıyla Oluşturulması,” Suleyman Demirel University, Journal of Engineering Sciences and Design, 2(3), SI:BioMechanics, 181-184, 2014.
• Okbaz, A., Olcay, A. B. and Pinarbasi, A., “Effect of Louver Angles on Thermal & Hydraulic Performance of Louvered Fin Heat Exchangers,” International Conference for Academic Disciplines, 30 June – 3 July 2014, Venice, Italy.
• Gökçen, M. G., Olcay, A. B. and Adıgüzel, Ö., “Numerical Investigation of the Irrigant Flow Inside the Real Dental Root Canal,” BİYOMUT 2012, 17. Biyomedical Toplantısı, Ekim 2012, Boğaziçi Üniversitesi Biyomedikal Mühendisliği Enstitüsü, İstanbul, Türkiye.
• Çakıcı, F., Yalçın, H. Ç. and Olcay, A. B., “2D numerical investigation of leaflet lenght and leaflet’s Young’s modulus on regurgitation,” BİYOMUT 2012, 17. Biyomedical Toplantısı, Ekim 2012, Boğaziçi Üniversitesi Biyomedikal Mühendisliği Enstitüsü, İstanbul, Türkiye.
• Olcay, A. B., Gökçen, M. G. and Adıgüzel, Ö., “Numerical Investigation of the Effect of Needle Tilting Angle on Irrigant Flow Inside the Tooth Root Canal,” Bulletin of TIPTEKNO11 and BİYOMUT 2011, 16. Biyomedical Toplantısı, Ekim 2011, Antalya, Türkiye.
• Masoom, A., Olcay, A. B., and Masoom, F., “Bridging the Gap Between High School and Engineering Freshmen,” Proceedings of the 2009 ASEE North Midwest Sectional Conference.
• Olcay, A. B., Masoom, A. and Masoom, F., “Effect of Math Competency on Success in Engineering Science Courses: Work in Progress,” Proceedings of the 2008 ASEE North Midwest Sectional Conference.
• Olcay, A. B., Saniei, N. and Yan, X., “Particle image velocimetry and heat transfer measurements of a disk at high rotational speeds,” ASME International Mechanical Engineering Congress & Exposition, November, 2002, New Orleans, LA.
• Çıgay C.P., Şafak K.K. and Karadağ V. "İki Ayaklı Düzlemsel Robot İçin Kuvvete Duyarlı Direnç Türü Sensörler İle Denge Kontrolü" Otomatik Kontrol Ulusal Toplantısı (TOK’15), pp. 1120-1124.
• Doğan U., Ağaoğlu A., Şafak K.K., Biomechanical Analysis of Sit-to-stand Motion Towards Design of a Mobility Assist Device for Physically Impaired People, VI. Ulusal Biyomekanik Kongresi, 27-29 Eylül 2012, Sakarya.
• Karadağ C.V., Şafak K.K., İki Ayaklı Robot Eklem Eyleyicisinin Modellenmesi, Tanılanması, Simülasyonu ve Deneysel Başarımı, Otomatik Kontrol Ulusal Toplantısı (TOK 2011), İzmir, 568-573, (2011).
• Karadağ C.V., Şafak K.K., İki Ayaklı Düzlemsel Bir Robot İçin Sensör Füzyon Uygulaması, Otomatik Kontrol Ulusal Toplantısı (TOK 2011), İzmir, 574-578, (2011).
• Şafak, K.K., Baturalp, T.B.,  “Design And Analysis of a Foot Contact Sensor for Posture Control of a Biped Robot”, ASME 10th Biennial Conference of Engineering Systems Design and Analysis (ESDA 2010). July 12-14, 2010, Istanbul, Turkey.
• Okyar F., Şafak K.K., Eğrican N., “Mechanical Design and Prototyping Considerations for an Intramedullary Nail for Extending Bone Sections”, ASME 10th Biennial Conference of Engineering Systems Design and Analysis (ESDA 2010). July 12-14, 2010, Istanbul, Turkey.
• Ağaoğlu, A., Çıblak, N., Şafak, K.K., “Workspace Optimization Of A Six Degrees Of Freedom Parallel Manipulator For Micromachining”, ASME 10th Biennial Conference of Engineering Systems Design and Analysis (ESDA 2010). July 12-14, 2010, Istanbul, Turkey.
• Onbaşıoğlu, E., Soydan, A., Atalay, B., Goularas, D., Safak, K.K., Okyar, F., “Visualisation of Burring Operation in Virtual Surgery Simulation”, ASME 10th Biennial Conference of Engineering Systems Design and Analysis (ESDA 2010). July 12-14, 2010, Istanbul, Turkey.
• S. Bozkurt, K. K. Şafak., E. Sorgüven, S. Küçükaksu, N. Çıblak, A. F. Okyar, M. A. Akgün, H. Ahn, A. N. Eğrican, İ. Lazoğlu, "Sol Karıncık Destek Cihazları İçin Kontrol Stratejileri”, Biyomedikal Mühendisliği Ulusal Toplantısı, Mayıs 2009.
• S. Bozkurt, K. K. Şafak., E. Sorgüven, S. Küçükaksu, N. Çıblak, A. F. Okyar, M. A. Akgün, H. Ahn, İ. Lazoğlu, A. N. Eğrican," Sol Ventrikül Destek Cihazları ile Dolaşım Sisteminin Modelleme ve Simülasyon Çalışmaları, Ulusal Yapay Organlar ve Destek Sistemleri Kongresi, Nisan 2009.
• Koray K. Şafak, T. Batuhan Baturalp, “İki Ayaklı Biyomimetik Yürüyen Robot için Yürüyüs Sentezi Yöntemleri ve Tasarım Ölçütlerinin Belirlenmesi”, Otomatik Kontrol Ulusal Toplantısı (TOK’08), pp. 258-262, 13-15 Kasım 2008, İstanbul.
•  Kaplanoglu, E, Şafak, K., Varol, H.S “Real-Time Parameter Estimation of a MIMO System”, International MultiConference of Engineers and Computer Scientists 2008 (IMECS 2008). March 19-21,2008 Hong Kong.·         Witting, J.H., Ayers, J. and Şafak, K. K., “Development of a Biomimetic Underwater Ambulatory Robot: Advantages of Matching Biomimetic Control Architecture with Biomimetic Actuators”, Proceedings of SPIE, 2000, 54-61.
• Şafak, K. K. and Türkay, O.S., “Identification of a Universal Motor Dynamics using Artificial Neural Networks” (in Turkish) , National Conference of Automatic Control , Oct. 15-16, 1998, Istanbul, Turkey.
• Şafak, K. K. and Erçil, A., “Surface Quality Control of Textile Products using Artificial Neural Networks” (in Turkish) , Signal Processing and Applications Conference , May 28-30, 1998, Ankara, Turkey.
• C. V. Karadag and N. Topaloglu, "Doğrusal Olmayan Rezonatörler için Bir Parametre Kestirim Tekniği," UMTS 2019, 19. Ulusal Makine Teorisi Sempozyumu, September 4-6, 2019, İskenderun, Hatay.
• S. Ertarla, C. V. Karadag and N. Topaloglu, "Axial and transverse vibration of a cantilever beam energy harvester with a tip mass with axial and transverse eccentricity," ICOVP 2019, 14th International Conference on Vibration Problems, September 1-4, 2019, Crete, Greece.
• S. Ertarla, C. V. Karadag and N. Topaloglu, “Analytical Modeling of a Cantilever Beam Type Vibration Energy Harvester with a Lever Mechanism” ISMA 2018, International Conference on Noise and Vibration Engineering, September 17-19, 2018, Leuven, Belgium.
• C. Yesilkaya, N. Topaloglu and N. Ciblak, “Modeling, Analysis of, and Experimentation on an Energy Harvester Device for Direct Tire Pressure Monitoring Systems,” OTEKON 2018, 9th International Automotive Technologies Congress, May 7-8, 2018, Bursa, Turkey.
• Ç. Seckin, N. Topaloglu and K. Safak, "Pasif ve Aktif Motor Takozlarının Modellenmesi ve Analizi," TOK 2015 Otomatik Kontrol Türk Milli Komitesi Ulusal Toplantısı, Denizli, 10-12 Eylül 2015.
• O. Kaya and N. Topaloglu, Sonlu Eleman Analizi Kullanarak Solenoid Modellenmesi, TOK 2015 Otomatik Kontrol Türk Milli Komitesi Ulusal Toplantısı, Denizli, 10-12 Eylül 2015.
• C. V. Karadag and N. Topaloglu, 2013, “A Piezoelectric Cantilever Beam with Tunable Natural Frequency,” IWPMA 2013 and 8th Annual Energy Harvesting Workshop, Jul. 14-18, 2013, Hannover, Germany.
• C. V. Karadag and N. Topaloglu, 2013, “Comparison of Amorphous Metal and Aluminum as a Structural Material for a Cantilever Beam Vibration Energy Harvester,” 6th ECCOMAS Conference on Smart Structures and Materials, Jun. 24-26, 2013, Torino, Italy.
• N. Topaloglu, A. A. Aksekili and B. Yegin, 2011, “An Optimized Damping Model for Vibration Based Energy Harvesters with Constrained Proof Mass Motion,” IWPMA 2011 and the 6th Annual Energy Harvesting Workshop, Aug. 7-11, 2011, Roanoke, VA, USA. 
• N. Topaloglu, A. A. Aksekili and B. Yegin, 2011, “A Displacement Dependent Damper For A Vibration Based Energy Harvester,” SET ’11, 10th International Conference on Sustainable Energy Technologies, Sep. 4-7, 2011, Istanbul, Turkey.
• N. Topaloglu, P. M. Nieva, M. Yavuz and J. P. Huissoon, 2008, “A pixel-by pixel thermal conductance tuning mechanism for uncooled microbolometers,” MNRC’08 1st Microsystems and Nanoelectronics Research Conference, pp. 201-204, Oct. 15, 2008. 
• N. Topaloglu, P. M. Nieva, M. Yavuz and J. P. Huissoon, “Thermal modeling of thermally isolated microplates,” Proc. SPIE Vol. 6926, 692633 (Apr. 3, 2008), NDE’08, San Diego, US. 
• N. Topaloglu, C. Elbuken, P. M. Nieva, M. Yavuz and J. P. Huissoon, “Modeling and simulation of a 2-DOF bidirectional electrothermal microactuator,” Proc. SPIE Vol. 6926, 692605 (Apr. 3, 2008), NDE’08, San Diego, US.
• N. Topaloglu, P. M. Nieva, M. Yavuz and J. P. Huissoon,2007, “A novel method for estimating the thermal conductance of uncooled microbolometer pixels,” ISIE’07 IEEE International Symposium on Industrial Electronics, pp. 1554-8, June 4-7, 2007.
• N. Topaloglu, P. M. Nieva, M. Yavuz and J. P. Huissoon, 2007, “Thermal Conductance Estimation for Uncooled Microbolometer Pixels,” Proc. of 21st Canadian Congress of Applied Mechanics (CANCAM'07), pp. 740-741, Toronto, ON, June 3-7, 2007.
• N. Topaloglu, M. Yavuz, J. P. Huissoon and P. M. Nieva “Semiconducting YBa2Cu3O6+x based uncooled microbolometer,” Emerging Materials Knowledge Conference, Toronto, June 2005 (poster presentation).
• Güldeniz, O., Karadağ, V., Fethi Okyar, A., "A Semi-automatic Parameter Extraction Process for Modeling of Lumbar Vertebral Body Segments", Lecture Notes in Computational Vision and Biomechanics, (2019) 34, pp. 649-658.
• Okyar, A.F., Safak, K.K., Egrican, N., "Mechanical design and prototyping considerations for an intramedullary nail for extending bone sections", ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010, (2010) 1, pp. 725-732.
• Onbasioǧlu, E., Atalay, B., Goularas, D., Soydan, A.H., Şafak, K.K., Okyar, F., "Visualisation of burring operation in virtual surgery simulation", ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010, (2010) 1, pp. 805-812.
• Bozkurt, S., Şafak, K.K., Sorgüven, E., Küçükaksu, S., Çiblak, N., Okyar, A.F., Akgün, M.A., Ahn, H., Eǧrican, A.N., Lazoǧlu, I., "Control strategies for the left ventricular assist devices [Sol karincik destek cihazlari i̇çin kontrol stratejileri]", Proceedings of 2009 14th National Biomedical Engineering Meeting, BIYOMUT 2009, (2009) art. no. 5130335,.
• Sorguven, E., Ciblak, N., Okyar, A.F., Akgun, M.A., Egrican, A.N., Safak, K.K., Ahn, H., Lazoglu, S., Kucukaksu, S., "Flow simulation and optimization of a left ventricular assist device", ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), (2007) 8, pp. 1401-1407.

Other Papers

• H. Ahn, 1996, “Implicit Multicell Venting Code User’s Manual.”  Prepared for Space and Missile Systems Center - Air Force Material Command (Contract No. F04701-93-C-0094), Aerospace Report No. TOR-96(1414)-11 
• H. Ahn and C. E. Brennen, 1992, Channel flows of granular material and their rheological implications. Particulate Two-phase Flow, (ed. M. C. Roco), Butterworth-Heinemann, 210-243.
• H. Ahn, 1989, “Experimental and analytical investigations of granular materials: shear flow and convective heat transfer.” Ph.D. Thesis, California Institute of Technology.