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Threshold Voltage Variations Due to Oblique Single Grain Boundary in Sub-50-nm Polysilicon Channel
Jungsik Kim,Taiuk Rim,Junyoung Lee,Chang-Ki Baek,Meyyappan, Meyya,Jeong-Soo Lee IEEE 2014 IEEE transactions on electron devices Vol.61 No.8
<P>We investigate the effect of single grain boundary (SGB) with arbitrary angles on the threshold voltage (V<SUB>th</SUB>) variation in sub-50-nm polysilicon (poly-Si) channel devices using 3-D simulation. An SGB in the poly-Si channel causes changes in potential barrier profile resulting in the variation of V<SUB>th</SUB>. As the planar devices scale down to 20-nm, oblique SGB can significantly increase the whole potential barrier profile and cause large V<SUB>th</SUB> variation. However, due to superior gate controllability, the gate-all-around devices show relatively small increase of the conduction energy band, and thus mitigate the V<SUB>th</SUB> variation even in 20-nm poly-Si channel.</P>
Competition in Two-sided Platform Markets with Direct Network Effect
Jungsik Hyun 서울대학교 경제연구소 2016 Seoul journal of economics Vol.29 No.3
In light of recent trends in social networking services that encourage users of platforms to “share,” “recommend,” and “do activities” with others, this work analyzes platform competition in two-sided markets that exhibit direct (or within-) network effect in addition to conventional cross-network effect. Introduction of direct network effect to one group (buyer-side) in a two-sided market generates two counteracting effects: demand-augmenting effect and demand-sensitizing effect. The former allows platforms to raise buyer-side price, thereby increasing the sum of prices charged to buyers and sellers, whereas the latter causes platforms to lower them. I show that demand-augmenting effect dominates demand-sensitizing effect under the monopoly platform, whereas introducing competition between platforms under sufficient direct network effect relatively strengthens the demandsensitizing effect, which lowers the price charged to buyers.
H-Band Power Amplifier Integrated Circuits Using 250-nm InP HBT Technology
Jungsik Kim,Sanggeun Jeon,Moonil Kim,Urteaga, Miguel,Jinho Jeong IEEE 2015 IEEE transactions on terahertz science and technol Vol.5 No.2
<P>In this paper, H-band (220-325 GHz) power amplifier (PA) integrated circuits (ICs) are presented using 250-nm InP HBT technology, where a cascode topology was adopted to achieve high gain and high output power. Three PAs were designed: PA1 was implemented with two-stage cascode HBTs, PA2 combined two PA1s, and PA3 combined four PA1s, by using Wilkinson couplers without isolation resistors. Electromagnetic simulations were carried out for the accurate design of passive circuits such as a microstrip line, a capacitor, and RF pads. The measured insertion loss of the RF pad and Wilkinson coupler was as low as 0.24 dB and 0.70 dB, respectively, at 300 GHz. The three PAs exhibited a measured gain higher than 15 dB with good return losses at 300 GHz. The output powers scaled well with total emitter area of the PAs. PA3 exhibited a maximum output power of 13.5 dBm at 301 GHz. To the best of the authors' knowledge, this corresponds to the highest output power among the previously reported solid-state PAs in this frequency range.</P>
Universal view synthesis unit for glassless 3DTV
Jungsik Park,Ji-Youn Choi,In Ryu,Jong-Il Park IEEE 2012 IEEE transactions on consumer electronics Vol.58 No.2
<P>As 3D content is becoming popular, the data size of such content is getting larger, which may cause a critical bandwidth problem in deploying 3D broadcast services. View synthesis using depth maps can play a key role in avoiding the bandwidth problem. In this paper, we propose a universal view synthesis unit (UVSU), which allows depth image-based fast view synthesis by parallel processing using a programmable graphic process unit (GPU). Assuming that a few stereo images and their corresponding disparity maps are given, we synthesize multiple virtual viewpoint images in realtime. Moreover, the proposed UVSU can freely adjust various requirements, such as the number of virtual viewpoints, their positions, and the intervals of each virtual viewpoint depending on 3D display devices. The effectiveness of our approach is verified through many experiments with various real images.</P>
Evaluation of Telerobotic Shared Control Strategy for Efficient Single-Cell Manipulation
Jungsik Kim,Ladjal, H.,Folio, D.,Ferreira, A.,Jung Kim IEEE 2012 IEEE transactions on automation science and engine Vol.9 No.2
<P>Microinjection is a method for the delivery of exogenous materials into cells and is widely used in biomedical research areas such as transgenics and genomics. However, this direct injection is a time-consuming and laborious task, resulting in low throughput and poor reproducibility. Here, we describe a telerobotic shared control framework for microinjection, in which a micromanipulator is controlled by the shared motion commands of both the human operator and the autonomous controller. To determine the weightings between the operator and the controller, we proposed a quantitative evaluation method using a model of speed/accuracy trade-offs in human movement. The results showed that a 40%-60% weighting on the human operator (or the controller) produced the best performance for both speed and accuracy of guiding and targeting task in microinjection suggesting that some level of both automation and human involvement is important for microinjection tasks.</P>
Range-Adaptive Wireless Power Transfer Using Multiloop and Tunable Matching Techniques
Jungsik Kim,Jinho Jeong IEEE 2015 IEEE transactions on industrial electronics Vol.62 No.10
<P>In this paper, a range-adaptive wireless power transfer (WPT) system is proposed to achieve high efficiency over a wide range of distances by using tunable impedance matching techniques. A multiloop topology is employed to greatly reduce the variation in the input impedance of the WPT system with respect to the distance, where one of the four loops with a different size is selected, depending on the distance. It enables the design of a simple tunable matching circuit using a single variable capacitor. An algorithm is written to find the optimum loop and capacitance in the matching network, based on the measured input return loss using a directional coupler and rectifiers. The fabricated WPT system shows a range-adaptive operation with high efficiency over a wide range of distances. It attains 48% efficiency at a distance of 100 cm with a maximum efficiency of 92% at a distance of 10 cm.</P>