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김도윤(Doyoon Kim),이재훈(Jaehoon Lee),유동현(Dong Hyun Yoo),박현우(Hyunwoo Park),남동균(Dongkyun Nam),박주영(Jooyoung Park) 대한전기학회 2010 정보 및 제어 심포지엄 논문집 Vol.2010 No.4
차량 위치 파악은 도로 교통 흐름을 파악하고 운전자에게 효과적인 길안내를 위해 중요한 기술로 현재 ITS 및 텔레매틱스 분야에서는 GPS 위성을 이용하여 서비스를 제공하는 방식이 일반적이다. 전파를 이용하는 GPS 방식의 경우 전파의 다중 경로 현상 및 전파가 도달하지 못하는 터널, 지하, 건물 내에서는 사용이 불가능하다는 단점이 있다. 기존 많은 연구에서는 관성측정장치(Inertial Measurement Unit, IMU)와 센서 융합을 통해 이러한 단점을 극복하려는 시도가 계속되고 있다. 본 연구에서는 GPS, IMU 뿐만 아니라 차량 자체에 내장되어 있는 ECU에서 출력하는 차량 속도 정보 및 고도센서의 정보를 이용하여 보다 정밀한 차량 위치 추정 및 GPS 신호가 불량한 경우에도 차량의 위치를 추정할 수 있는 다중 센서 융합 시스템을 제안하고 실제 시스템을 구성하여 성능을 비교 평가하였다.
김도윤(Doyoon Kim),정호성(Hosung Jung),박영(Park Young),박현준(Park Hyun-June),김형철(Hyung Chul Kim),최원석(Choi Won Seok) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
The power facilities of urban rail transit is remarkably essential part. Since it is directly related to the train's safe operation. Currently, the power facilities are being cared by just the naked eye and TBM (Time Based Maintenance). It is not enough for the preservation of the power facilities and need more sensible and reasonable plan for management. In this paper, scientific and systemic ways to figure out times to replace and check of power facilities are suggested. It is based on environmental factors of each line, the number of daily trips and the deterioration level of power facilities by surveying and analyzing the periodic check and improvement of domestic and foreign Metropolitan Subway Corporation. Also, the way of forming the best maintenance plan by using the real-time observation data that compiled from the condition monitoring and control system is suggested.
김도윤(Kim Doyoon),정호성(Jung Hosung),박영(Park Young),박현준(Park Hyun-June),박영재(Park Youngjae),김성태(Kim Sungtae) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
Power facilities of urban rail transit substation is deterioration, and endurance limitation is coming, so urban rail transit facilities should take any necessary measure for maintenance and repair. In this paper proposes online monitoring system using the wireless communications for the urban rail transit. This system is constructed various departments; such as sensor, measurement, data communication, host computer, and power departments. It is designed to collect and save AI (Analog Input) information of the power facilities, and to analyze and display them. As a result, it is possible to prevent from any unexpected power cuts and monitor any abnormalities in real time, and to collect accumulated data for creating a better management system.
A $D$ -Band CMOS Amplifier With a New Dual-Frequency Interstage Matching Technique
Kim, Dong-Hyun,Kim, Doyoon,Rieh, Jae-Sung Professional Technical Group on Microwace Theory a 2017 IEEE Transactions on Microwave Theory and Techniqu Vol. No.
<P>A new interstage matching technique has been proposed and successfully applied to a D-band amplifier in a 65-nm CMOS technology. The proposed technique is based on a simultaneous conjugate matching at the interstages of multistage amplifiers at two frequencies, resulting in an increased bandwidth. The six-stage amplifier designed based on this technique shows a peak gain of 13.8 dB at 113.7 GHz with a 3-dB bandwidth of 11.2 GHz (110.6-121.8 GHz) without balun loss compensation, while consuming a dc power of 40 mW. Measured noise figure shows a minimum value of 10.8 dB at 115 GHz. The output P-1 dB and the saturation output power P-sat are -14 and -3 dBm, respectively. The circuit occupies an area of 1100 x 550 mu m(2).</P>
Long-term reliable physical health monitoring by sweat pore-inspired perforated electronic skins
( Hanwool Yeon ),( Haneol Lee ),( Yeongin Kim ),( Doyoon Lee ),( Youngjoo Lee ),( Jong-sung Lee ),( Jiho Shin ),( Chanyeol Choi ),( Ji-hoon Kang ),( Jun Min Suh ),( Hyunseok Kim ),( Hyun S. Kum ),( Ja 한국피부장벽학회 2022 한국피부장벽학회지 Vol.24 No.2
Electronic skins (e-skins)―electronic sensors mechanically compliant to human skin―have long been developed as an ideal electronic platform for non-invasive human-health monitoring. For reliable physical health monitoring, the interface between the e-skin and human skin must be conformal and intact consistently. However, conventional e-skins cannot perfectly permeate sweat in normal day-to-day activities, resulting in degradation of the intimate interface over time and impeding stable physical sensing. Here, we present a sweat pore-inspired perforated e-skin that can effectively suppress sweat accumulation and allow inorganic sensors to obtain physical health information without malfunctioning. The auxetic dumbbell through-hole patterns in perforated e-skins lead to synergistic effects on physical properties including mechanical reliability, conformability, areal mass density, and adhesion to the skin. More importantly, the perforated e-skin allows one to laminate onto the skin with consistent homeostasis, enabling multiple inorganic sensors on the skin to reliably monitor the wearer’s health over a period of weeks.
Long-term reliable physical health monitoring by sweat pore-inspired perforated electronic skins
( Hanwool Yeon ),( Haneol Lee ),( Yeongin Kim ),( Doyoon Lee ),( Youngjoo Lee ),( Jong-sung Lee ),( Jiho Shin ),( Chanyeol Choi ),( Ji-hoon Kang ),( Jun Min Suh ),( Hyunseok Kim ),( Hyun S. Kum ),( Ja 한국피부장벽학회 2022 한국피부장벽학회지 Vol.24 No.2
Electronic skins (e-skins)―electronic sensors mechanically compliant to human skin―have long been developed as an ideal electronic platform for non-invasive human-health monitoring. For reliable physical health monitoring, the interface between the e-skin and human skin must be conformal and intact consistently. However, conventional e-skins cannot perfectly permeate sweat in normal day-to-day activities, resulting in degradation of the intimate interface over time and impeding stable physical sensing. Here, we present a sweat pore-inspired perforated e-skin that can effectively suppress sweat accumulation and allow inorganic sensors to obtain physical health information without malfunctioning. The auxetic dumbbell through-hole patterns in perforated e-skins lead to synergistic effects on physical properties including mechanical reliability, conformability, areal mass density, and adhesion to the skin. More importantly, the perforated e-skin allows one to laminate onto the skin with consistent homeostasis, enabling multiple inorganic sensors on the skin to reliably monitor the wearer’s health over a period of weeks.
Controlled crack propagation for atomic precision handling of wafer-scale two-dimensional materials
Shim, Jaewoo,Bae, Sang-Hoon,Kong, Wei,Lee, Doyoon,Qiao, Kuan,Nezich, Daniel,Park, Yong Ju,Zhao, Ruike,Sundaram, Suresh,Li, Xin,Yeon, Hanwool,Choi, Chanyeol,Kum, Hyun,Yue, Ruoyu,Zhou, Guanyu,Ou, Yunbo American Association for the Advancement of Scienc 2018 Science Vol.362 No.6415
<P><B>Cleaving with a metal handle</B></P><P>Using adhesive tape to pull off monolayers of two-dimensional (2D) materials is now a well-established approach. However, the flakes tend to be micrometer scale, and the creation of multilayer stacks for device application can be challenging and time consuming. Shim <I>et al.</I> show that monolayers of a variety of 2D materials, including molybdenum disulfide and hexagonal boron nitride, can be cleaved from multilayers grown as 5-centimeter-diameter wafers. The multilayer is capped with a nickel layer, which can be used to pull off the entire grown stack. The bottom of the stack is again capped with nickel, and a second round of cleaving leaves the monolayer on the bottom nickel layer. The monolayers could be transferred to other surfaces, which allowed the authors to make field-effect transistors with high charge-carrier mobilities.</P><P><I>Science</I>, this issue p. 665</P><P>Although flakes of two-dimensional (2D) heterostructures at the micrometer scale can be formed with adhesive-tape exfoliation methods, isolation of 2D flakes into monolayers is extremely time consuming because it is a trial-and-error process. Controlling the number of 2D layers through direct growth also presents difficulty because of the high nucleation barrier on 2D materials. We demonstrate a layer-resolved 2D material splitting technique that permits high-throughput production of multiple monolayers of wafer-scale (5-centimeter diameter) 2D materials by splitting single stacks of thick 2D materials grown on a single wafer. Wafer-scale uniformity of hexagonal boron nitride, tungsten disulfide, tungsten diselenide, molybdenum disulfide, and molybdenum diselenide monolayers was verified by photoluminescence response and by substantial retention of electronic conductivity. We fabricated wafer-scale van der Waals heterostructures, including field-effect transistors, with single-atom thickness resolution.</P>