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Kim, Gyungock,Park, Jeong Woo,Kim, In Gyoo,Kim, Sanghoon,Kim, Sanggi,Lee, Jong Moo,Park, Gun Sik,Joo, Jiho,Jang, Ki-Seok,Oh, Jin Hyuk,Kim, Sun Ae,Kim, Jong Hoon,Lee, Jun Young,Park, Jong Moon,Kim, Do- Optical Society of America 2011 Optics express Vol.19 No.27
<P>We present high performance silicon photonic circuits (PICs) defined for off-chip or on-chip photonic interconnects, where PN depletion Mach-Zehnder modulators and evanescent-coupled waveguide Ge-on-Si photodetectors were monolithically integrated on an SOI wafer with CMOS-compatible process. The fabricated silicon PIC(off-chip) for off-chip optical interconnects showed operation up to 30 Gb/s. Under differential drive of low-voltage 1.2 V(pp), the integrated 1 mm-phase-shifter modulator in the PIC(off-chip) demonstrated an extinction ratio (ER) of 10.5dB for 12.5 Gb/s, an ER of 9.1dB for 20 Gb/s, and an ER of 7.2 dB for 30 Gb/s operation, without adoption of travelling-wave electrodes. The device showed the modulation efficiency of V(π)L(π) ~1.59 Vcm, and the phase-shifter loss of 3.2 dB/mm for maximum optical transmission. The Ge photodetector, which allows simpler integration process based on reduced pressure chemical vapor deposition exhibited operation over 30 Gb/s with a low dark current of 700 nA at -1V. The fabricated silicon PIC(intra-chip) for on-chip (intra-chip) photonic interconnects, where the monolithically integrated modulator and Ge photodetector were connected by a silicon waveguide on the same chip, showed on-chip data transmissions up to 20 Gb/s, indicating potential application in future silicon on-chip optical network. We also report the performance of the hybrid silicon electronic-photonic IC (EPIC), where a PIC(intra-chip) chip and 0.13μm CMOS interface IC chips were hybrid-integrated.</P>
Kim, Gyungock,Park, Jeong Woo,Kim, In Gyoo,Kim, Sanghoon,Jang, Ki-Seok,Kim, Sun Ae,Oh, Jin Hyuk,Joo, Jiho,Kim, Sanggi Optical Society of America 2014 Optics letters Vol.39 No.8
<P>We present small-sized depletion-type silicon Mach-Zehnder (MZ) modulator with a vertically dipped PN depletion junction (VDJ) phase shifter based on a CMOS compatible process. The fabricated device with a 100 μm long VDJ phase shifter shows a VπLπ of 0.6??Vcm with a 3 dB bandwidth of 50??GHz at -2??V bias. The measured extinction ratios are 6 and 5.3 dB for 40 and 50??Gb/s operation under 2.5??Vpp differential drive, respectively. On-chip insertion loss is 3 dB for the maximum optical transmission. This includes the phase-shifter loss of 1.88??dB/100??μm, resulting mostly from the extra optical propagation loss through the polysilicon-plug structure for electrical contact, which can be readily minimized by utilizing finer-scaled lithography nodes. The experimental result indicates that a compact depletion-type MZ modulator based on the VDJ scheme can be a potential candidate for future chip-level integration.</P>
Real Time Traffic Light Detection Algorithm Based on Color Map and Multilayer HOG-SVM
Sanggi Kim(김상기),Dong Seog Han(한동석) 한국방송·미디어공학회 2017 방송공학회논문지 Vol.22 No.1
Accurate detection of traffic lights is very important for the advanced driver assistance system (ADAS). There have been many research developments in this area. However, conventional of image processing methods are usually sensitive to varying illumination conditions. This paper proposes a traffic light detection algorithm to overcome this situation. The proposed algorithm first detects the candidates of traffic light using the proposed color map and hue-saturation-value (HSV) Traffic lights are then detected using the conventional histogram of oriented gradients (HOG) descriptor and support vector machine (SVM). Finally, the proposed Multilayer HOG descriptor is used to determine the direction information indicated by traffic lights. The proposed algorithm shows a high detection rate in real-time.
Electric Propulsion Naval Ships with Energy Storage Modules through AFE Converters
Kim, So-Yeon,Choe, Sehwa,Ko, Sanggi,Kim, Sungmin,Sul, Seung-Ki The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.2
This paper proposes a novel electric propulsion system for naval ships, which consists of Active Front End (AFE) converters directly connected to battery Energy Storage Modules (ESMs). Employing the proposed AFE converters with ESMs in the power systems of naval ships can enhance the reliability and quality of the electric power. Furthermore, the fuel-efficiency of the generator can be improved by a higher loading factor of the generator and its prime movers. The proposed AFE configuration does not require an additional dedicated DC/AC converter for the ESMs. Instead of that, the AFE converter itself can control the DC link voltage and the discharging and/or charging of the ESMs. A control scheme to achieve these control objectives is also presented in this paper. The overall power system, including the generators and electrical loads of a naval ship, is implemented by a small scaled Power Hardware-In-the-Loop (PHIL) simulator. Through this experimental setup, the proposed system configuration and the power control strategies are verified. It is shown that the fuel-efficiency and transient dynamics can be improved in the normal and contingency operation modes.
하중속도에 따른 SP시험과 FEM해석에 의한 중력주조 AM60B 거동 특성
김상기(Sanggi Kim),양성모(Sungmo Yang),유효선(Hyosun Yu),송준혁(JoonHyuk Song) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Magnesium alloy is the material in which the lightness, the specific strength , the non-rigid, the damping capacity and the shielding. Also it have various strength such as the high effectiveness and the energy-saving of machinery. In recent years, the concern about magnesium alloy increases and the lightness necessity in automotive industry enlarged. So it is considered as the material that can replace the aluminium alloy. Therefore, this research purpose is to see the behavior characteristics of lightweight magnesium AM60B with good property. We deducted fracture deformation and energy by conducting SP test in room temperature and at load speed 0.2, 2, 20㎜/min. Also we understand microstructure and fracture plane through scanning electron microscope and optical microscope. And we design widely used vehicle inner door panel and implement finite element analysis base on data derived from sp test. As a result, according to load speed, we catch the different of AM60B magnesium deformation behavior. we see that the gap of strength is not only denpend on the size of impact bar and braket but also the load speed as important parameter.