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전기방사기법으로 제작된 인공지지체 내부의 확산현상 측정 및 시뮬레이션
이승열(SeungYoul Lee),이종완(Jongwan Lee),채상민(SangMin Chae),김성준(Seongjun Kim),정영훈(Young Hun Jeong),김중경(JungKyung Kim),진송완(Songwan Jin) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In this study, we made line patterns of nanofiberous structures using electrospinning technique and alginate hydrogel and we measured local diffusion coefficient of 3 kDa FITC-dextran using the fluorescence recovery after photobleaching(FRAP) technique. As results of the FRAP measurements, we didn’t observe any significant differences in the diffusivity among the samples. Calculated diffusivity of the electrospun line patterns and alginate hydrogel based on the measured oxygen diffusivity appeared to be about 92?94% as compared with the oxygen diffusivity in water. We also conducted the simulation of oxygen diffusion phenomena within the 3D model scaffold which is consisted that oxygen permeable line structures scaffold and solid scaffold with various oxygen diffusivity.
박경창(Kyung-Chang Park),김한벼리(Hanbyeori Kim),이상진(Sang-Jin Lee),김승열(Seungyoul Kim),박래현(Raehyeon Park),김용대(Yongdae Kim),유영갑(Younggap You) 大韓電子工學會 2009 電子工學會論文誌-TC (Telecommunications) Vol.46 No.11
This paper presents a tag emulator for a UHF band RFID system. The tag emulator supports the 1800-6C and EPC global class 1 generation 2 standards. The transmitted signal from a reader is generated using the PIE coding and ASK modulation methods. Signals of a tag are from the FM0 coding and ASK modulation methods. The ARM7 processor carries out the overall control of the system and signal analysis of incoming data. The verification of the tag emulator employs the application platform implemented in C++. Users can define parameter values for protocol during the application run. The tag emulator presented in this paper allows evaluating various design alternatives of the target RFID system in real applications. 본 논문은 UHF 대역 RFID 시스템의 태그 에뮬레이터를 제안한다. 태그 에뮬레이터는 18000-6C와 EPC global class 1 generation 2 표준을 지원한다. 리더로부터의 송신신호는 PIE 부호화 방식과 ASK 변조방식을 사용하였으며, 태그로부터의 송신신호는 FM0 부호화 방식과 ASK 변조방식을 사용하였다. 송?수신 신호 전달에 대한 처리는 상용 송?수신 칩을 사용한다. 태그 에뮬레이터의 전체 제어와 신호 해석 및 처리는 ARM7 프로세서가 담당한다. 태그 에뮬레이터의 기능 검증은 구현된 C++ 기반의 어플리케이션을 통해 하였다. 프로토콜에 따른 각 파라미터 값은 어플리케이션에서 사용자가 지정하여 검증할 수 있다. 본 논문에서 제안된 태그 에뮬레이터는 여러 가지 설계가능성을 실제적인 환경에서 쉽고 빠르게 평가할 수 있도록 한다.
김영웅(Youngwoong Kim),정종현(Chonghyeon Cheong),용승열(Seungyoul Yong) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Time-resolved calculation during the cold start period of FCC and BCC has been tried in view of HC emission and energy. Light off time (LOt) calculation of NEDC was implemented for the first time. Category in this first cycle of mode was discerned four kinds of regions: 1) key-on and 11sec idle, 2) short acceleration which BCC`s power is demanded and start of catalyst warm-up,, 3) steady and declined speed which catalyst warmed-up, 4) re-idle which Lot of FCC is reached. Test for temperature measurement was implemented on the different loadings of FCC. Calculation of FCC bed can actually be conducted according to the simplified region area done previous FTP vehicle. Result was shown with good differentiations. AU53 measure, which was firstly applied to the Euro-5 vehicle with low speed, indicated a good correlation with measured data besides FTP driven vehicle with high speed is applied in calculation. Consequently by combined major variables comprising of FCC we could forecast Lot values by modulation of major variables like A/F and RPM of Vehicle, heat capacity of FCC.
자동차 거주성 평가를 위한 감성공학/인간공학적 가이드라인 개발
이승환(Seunghwan Lee),김수환(Soohwan Kim),박범(Peom Park),이동하(Dhongha Lee),유재우(Jaewoo Yoo),나건(Keoun Nah),백승렬(Seungyoul Paik) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Consumers have benn interested in Roominess of car. Almost every car makers direct their efforts to enlarge vehicle interior roominess. Until now, the first method of enlarging roominess of vehicle is only enlarging interior dimensions; Legroom, Headroom, Shoulder room and so on. Many consumers do not feel so large despite of large interior physical dimensions. Therefore, we determine the definition of roominess as a perception and find the relation between roominess as a perception and physical dimension which applied in the early period of vehicle design by consumer's survey. Statistics methods have been used for analyzing survey results.
Fault TolII. 데이터 재배열과 오류 정정erant Encryption and Data Compression under Ubiquitous Environment
유영갑(Younggap You),김한벼리(Hanbyeori Kim),박경창(Kyungchang Park),이상진(Sangjin Lee),김승열(Seungyoul Kim),홍윤기(Yoonki Hong) 한국콘텐츠학회 2009 한국콘텐츠학회논문지 Vol.9 No.8
본 논문은 암호화된 영상 데이터가 유비쿼터스 환경 하에서 무선 간섭에 의한 랜덤 오류를 가질 때 복호화 과정의 오류 산사태에 대한 해결책을 제시하였다. 영상 획득 장치는 영상 압축과 암호화 기능을 가지고서 데이터 트래픽 양을 줄이고 개인 정보를 보호하도록 구성한다. 블록 암호 알고리즘은 암호문의 단일 비트 오류가 여러 개의 픽셀 결함을 유발하는 산사태 효과를 겪을 수 있다. 새로운 고장 극복 방식은 오류의 산사태 효과를 다루는데 3 차원 데이터 셔플을 활용하여 에러 비트를 여러 프레임으로 분산시켜서 고립된 영상 결함으로 나타나도록 한다. 인접 화소 값에 대한 평균화 또는 다수결 회로는 에러정정을 위한 데이터 증가 없이 두드러져 보이는 화소 결함을 극복하도록 한다. 이 방식은 기존 Hamming code 방식보다 33% 적은 데이터 트래픽 부하를 가진다. This paper presents a solution to error avalanche of deciphering where radio noise brings random bit errors in encrypted image data under ubiquitous environment. The image capturing module is to be made comprising data compression and encryption features to reduce data traffic volume and to protect privacy. Block cipher algorithms may experience error avalanche: multiple pixel defects due to single bit error in an encrypted message. The new fault tolerant scheme addresses error avalanche effect exploiting a three-dimensional data shuffling process, which disperses error bits on many frames resulting in sparsely isolated errors. Averaging or majority voting with neighboring pixels can tolerate prominent pixel defects without increase in data volume due to error correction. This scheme has 33% lower data traffic load with respect to the conventional Hamming code based approach.