SEMINAR

12 Apr 15.00
Sedat Nizamoğlu
Electrical and Electronics Engineering, Koç University
Abstract: I will present a wide variety of novel optoelectronic devices for energy harvesting, neural interfaces, light generation and wound closure. Colloidal quantum dots offer attractive electronic, optical and surface properties. In the last decade indium-based colloidal quantum dots have attracted significant attention as a biofriendly alternative to cadmium-based ones with their tunable electrical and optical properties. I will demonstrate biofriendly quantum dots based luminescent solar concentrators for low-cost, large-area and high-efficiency energy harvesting and neural interfaces for nervous system diseases. Moreover, I will discuss the formation and characteristics of self-assembled biopolymer- based lasers that are formed via coffee stain effect. In addition, I will discuss bioabsorbable optical waveguides for wound closure.
 
 
About the Speaker: Sedat Nizamoglu received his B.Sc. degree in Electrical and Electronics Engineering (EEE) in 2005, M. Sc. degree in Physics as a Valedictorian in 2007 and his Ph.D. in EEE in 2011 at Bilkent University. Immediately after graduation, he continued as a research fellow with a joint affiliation with Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital in USA. Before joining Koç University, he was a faculty member at Özyeğin University. His research focuses on the demonstration of innovative devices and interfaces for the applications to energy, medicine, and environment. He has published more than 40 research papers in prestigious journals including Nature Communication, Nature Photonics, Advanced Materials and Nano Letters. He was recognized by MIT Technology Review as Innovator Under 35 Turkey, he recevied Outstanding Young Scientist Award by Turkish Academy of Sciences and Science Academy. In addition, he was awarded an ERC (European Research Council) Starting Grant.
12 Mar 15.00
Dr. Ahmet C. Durgun

Impact of Fiber Weaves On the Electrical Performance of Glass Epoxy Packages

Today’s microelectronics manufacturing industry is facing several challenges as the market marches towards smaller form factor and higher bandwidth products. One of the key challenges associated with these devices is to achieve the necessary electrical performance with sufficiently low-cost packaging solutions. In order to minimize packaging costs, engineers continuously attempt to shrink the size of the package, which imposes a set of challenges on maintaining the electrical performance. Furthermore, the ever-increasing bus speeds drive increasingly stringent requirements on the current and next-generation high-speed communication channels, both at the system and component levels. Some of the low-cost packaging technologies utilize glass epoxy substrates that are composed of glass fiber bundles and epoxy resin, which have different electrical properties. These differences result in variations in characteristic impedance and propagation speeds, which may be detrimental at high data rates. The insertion loss, within-pair skew, differential to common mode conversion ratio, and crosstalk of transmission lines may drastically increase due to the fiber weave effect. Consequently, the link budget of high-speed communication channels may be significantly hindered. In this seminar, the package level impact of fiber weaves on the electrical performance of high-speed buses will be addressed, in the light of current microelectronic demands, and some mitigation techniques will be discussed.

 

 

Ahmet Cemal Durgun received the B.S.E.E. and M.S.E.E. degrees from Middle East Technical University, Turkey, Ankara, in 2005 and 2008, respectively, where he completed the double major program in mathematics and received the B.S. degree, in 2006. He completed his Ph.D. studies, related to flexible antennas and high impedance surfaces, at Arizona State University, Tempe, AZ, USA, in 2013. Currently, he is with the Intel Corporation, Assembly and Test Technology Development Department, working as a Sr. Analog Engineer. His research interests include microelectronic packaging, design of high-speed communication channels, high routing density interconnects, signal integrity, and applied electromagnetics.

05 Mar 15.00
Dr. Eren Balevi
The University of Texas at Austin, Electrical and Computer Eng. Dept.

Designing and managing large-scale wireless networks using stochastic geometry and machine learning are discussed for one intriguing network architecture, which is composed of cloud and fog nodes, and dubbed as cloud-fog-thing network architecture, that is under consideration for 5G. Some important points of this architecture that are the optimum number of fog nodes and their locations are determined in an attempt to increase the average data rate and decrease the transmission delay using stochastic geometry and machine learning. Interestingly, these results may be adapted to increase the understanding of the role of spinal cord plasticity in learning when brain and spinal cord are treated as a cloud and fog network, respectively. This may ultimately suggest new means of treating central nervous system disorders associated with the spinal cord plasticity. Based on this duality, a modified coded caching policy is proposed as well for wireless networks inspired from the central nervous system, i.e., from the cooperation between brain and spinal cord. Lastly, the importance of machine learning in wireless communications and their application areas in large-scale wireless networks are emphasized in this seminar.

 

ABOUT SPEAKER:

Eren Balevi received his B.Sc., M.Sc. and Ph.D degree from the Electrical and Electronics Engineering Department of Middle East Technical University. He worked as an instructor in the Electrical Engineering Department of University of South Florida. Now, he is working as a post-doctoral researcher in the University of Texas, Austin in the wireless networking and communications group.  

 

26 Feb 15.00
Dr. Alper Koz
ODTÜ, İmge Analiz Merkezi

26 Feb 15.00
Dr. Alper Koz
ODTÜ, İmge Analiz Merkezi

21 Feb 9.00
Günay Turan

Tez Danışmanı     : Prof. Dr. Z. Yasemin Kahya
Tez Eş Danışmanı: Prof. Dr. Mehmet Akar

Yer: Yorgo Istefanopulos Seminer Salonu

21 Feb 9.00
Günay Turan

Tez Danışmanı     : Prof. Dr. Z. Yasemin Kahya
Tez Eş Danışmanı: Prof. Dr. Mehmet Akar

Yer: Yorgo Istefanopulos Seminer Salonu

01 Feb 14.00
Dr. Bülent Başol
Co-Founder/CEO of Active Layer Parametrics (ALP)

Photovoltaics (PV) market has shown tremendous growth since year 2000 reaching over 90GW in 2017. Thin film solar technologies, which were once considered to be the future of low cost PV, however, have had smaller and smaller portion of this booming market, after they peaked at around 20% market share in 2009. This talk, while touching upon the reasons for apparent failure of thin film PV in the market place, will review the impressive conversion efficiency gains researchers demonstrated for CdTe and CIGS based solar cells. These new developments, which resulted in over 22% efficient laboratory devices, will be reviewed and explained through device physics considerations. 

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