실시간 Social Distance 추적에 의한 감성 상호작용 인식 기술 개발

이현우,우진철,조아영,조영호,황민철,Lee, Hyunwoo,Woo, Jincheol,Cho, Ayoung,Jo, Youngho,Whang, Mincheol 한국감성과학회 2017 감성과학 Vol.20 No.3

본 연구는 비콘 기반의 웨어러블 디바이스를 통해 Social Distance로부터 감성 상호작용을 인식하기 위한 기술을 개발하였다. 인식된 상호작용은 Photoplethysmogram(PPG)로부터 추정된 심혈관 동시성과 비교하여 평가되었다. 상호작용은 Social Distance가 일정 시간 이상 유지되었을 경우 인식되었으며, 심혈관 동시성은 PPG로부터 계산된 Beats Per Minute(BPM) 간의 상관분석을 통해 추정되었다. Social Distance로부터 유효한 상호작용을 인식하기 위한 유지시간을 결정하기 위해 상호작용 대상일 때와 아닐 때의 심혈관 동시성에 대해 Mann-Whitney U test를 실시하였다. 15개 집단(집단 당 2명)이 실험에 참여하였으며, 이들은 일상생활에서 비콘 및 PPG 웨어러블 디바이스를 착용하도록 요청받았다. 그 결과, 본 연구에서 인식한 상호작용 대상은 더 높은 심혈관 동시성을 보이는 것으로 나타났으며, 유효 상호작용 시간은 통계적 유의차를 보이는 11초로 결정되었다(p=.045). 결과적으로 실 공간에서의 사회관계망에 대한 실시간 측정과 평가를 할 가능성을 높였다. This study developed a method which recognizes emotional interactions from the social distance by a beacon wearable device. The recognized interaction was evaluated by comparing with the cardiovascular synchrony from photoplethysmogram (PPG). The interaction was recognized when social distance was maintained for a certain period of time. The cardiovascular synchrony was estimated by correlation anaysis between beat per minute (BPM) from PPG. The maintenance time was determined by Mann-Whitney U test between the cardiovascular synchrony of interaction and non-interaction groups. Fifteen groups (2 persons per a group) participated in the experiment and they were asked to wear the beacon and PPG wearable devices in daily life. Experimental results showed that the interaction groups had more higher cardiovascular synchrony than non-interaction groups and the significant interaction time was determined to be 11 seconds (p=.045). Consequently, the real-time measurement and evaluation of the social network in real space was expected to be improved.

시간에 종속되는 스트렝스-스트레스 모형연구 - 스트렝스가 변하지 않는 경우 -

이현우,김재주,Lee, Hyunwoo,Kim, Jae Joo 한국품질경영학회 1996 품질경영학회지 Vol.24 No.3

We treat problems of estimating reliability R(t) = P[Y(t) > X(t)] in the time dependent strength-stress model in which a unit of stress X(t) is subjected to environmental strength Y(t) at time t. In this paper we introduce a special model of R(t) with fixed strength and unaccumulated stress case, and propose a Mann-Whitney-Wilcoxon type estimator of R(t).

국내ㆍ외 자동차 실내공기질 관련 연구 동향

이현우(Hyunwoo Lee),최영태(Youngtae Choi),이광범(Kwangbum Lee),이정기(Jeongki Lee),김광일(Kwangil Kim),이정화(Jeongwha Lee),임종순(Jongsoon Lim),신영복(Youngbok Sin) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

All across our nation, people live, work, and learn in indoor environments and especially, many people spend more time than ever before inside of cars. Recent years have been increasing attention focused on the air contamination inside auto-cabin. The sources of air contamination inside auto-cabin are roughly divided into internal sources(ex. chemical compounds from interior material) and external sources(ex. tail-pipe emission etc.). The Purpose of this research is to examine the status of worldwide auto-cabin air quality study, and to give the information when research is intended to develop methods to mitigate indoor air problem from auto-cabin.

Strain rate을 고려한 크롬몰리브덴강의 고온저주기 피로특성 연구

이현우(Hyunwoo Lee),홍상혁(Sanghyuk Hong) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Isothermal fatigue characteristics of Cr-Mo heat resisting steel were investigated at high temperature. Isothermal low cycle fatigue tests at 300℃, 400℃ and 500℃ were performed with strain rates of 4×10?³/s, 4×10?⁴/s, 4×10??/s using smooth cylindrical specimens. Regardless of strain level, cyclic softening behavior was observed. The differences in fatigue lives were dependent on the magnitudes of plastic strain and total strain ranges. Plastic strain ranges were increased by increasing temperature and this plastic strain ranges together with ultimate strength can be used as the temperature compensation parameters.

HEV 시스템(모터/인버터) 효율 영향 요소 비교 시험 연구

이현우(Hyunwoo Lee),정원식(Wonsik Jeong),엄대식(Daesik Eom) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6

Since the past, social issues related to environmental issues are a problem that has been continuously contemplated worldwide, and various environmental regulations have been created and existing environmental regulations are also being strengthened. The automobile industry has also been producing products in accordance with these environmental regulations, but it is becoming increasingly difficult to match technology and production cost to produce in response to increasingly environmental regulations. For this reason, it is estimated that the speed of the transition from internal combustion engines to the era of electric vehicles is accelerating. The improvement of fuel efficiency of a vehicle is one of the important factors, and it is also an important research and development factor to develop electric and hybrid vehicles by minimizing the power loss compared to the mileage. Therefore, research on reducing the energy loss of the driving motor, which is a key component of electric vehicles and hybrid vehicles, is being actively conducted, and many manufacturers are studying motor efficiency improvement in the main use area. In this paper, the test factors related to mechanical and electrical efficiency of motors are classified, the effect of each factor on the efficiency is confirmed as the test results, and efficiency improvement is compared and analyzed. This study used a hybrid vehicle motor and inverter, and it is the result of comparative analysis of only some elements that can be changed in the test, excluding efficiency changes due to hardware changes such as a separate core or coil.

소형디젤엔진용 전자식 EGR밸브 개발과 차량적용에 관한 연구

이현우(Hyunwoo Lee),이창훈(Changhoon Lee),양갑진(Kabjin Yang),정용일(Youngil Jeong),이진욱(jinwook Lee) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1

Global demands related to vehicle emission from environmental protection organizations and governments have been increasing, resulting in the introduction of more severe emission regulation. In order to analyze the characteristics of Electric EGR valve, the EGR simulator was designed to control the now rate, pressure difference and temperature of EGR route and now rate of heat exchanger. In this paper shows the research of engine performance during EGR for the application of Electric EGR to SMART car and engine. It was installed a 3-cylinder turbo-charger light duty diesel engine with an electric EGR valve.

GSMP 개방형 인터페이스 기반의 병렬형 OBS 제어

이현우 ( Hyunwoo Lee ),권태현 ( Taehyun Kwon ),김춘희 ( Choonhee Kim ),차영욱 ( Youngwook Cha ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.2

광 버스트 스위칭(OBS) 기술은 광 회선 스위칭에서 발생하는 자원의 비효율적인 사용을 개선시키며, 광 패킷 스위칭에서 해결해야 할 과제인 광 버퍼링의 요구사항을 최소화한다. GSMP는 제어기와 레이블 스위치 사이에서 연결, 구성, 성능, 장애관리 및 동기화 기능을 제공하는 개방형 인터페이스이다. 개방형 인터페이스는 광 전달망과 제어평면의 기술을 독립적으로 진화되게 하며 스위치의 구현을 단순화시키지만, GSMP 프로토콜의 실행 오버헤드로 인하여 연결설정을 증가시키는 단점이 있다. 본 논문에서는 OBS의 제어를 위한 GSMP 개방형 인터페이스의 사용 방안과 연결설정의 지연을 개선시키기 위한 병렬형 연결설정 메커니즘을 제안한다. OBS 신호 프로토콜과 GSMP 인터페이스의 구현을 통하여 병렬형 제어 메커니즘의 실현성을 확인하며, 기존 스위치-대-스위치 제어와 GSMP 기반 병렬형 연결제어의 연결설정 지연을 측정한다.

스마트팩토리 해킹 및 취약점에 대한 베이즈 필터기반 AI 보안 방안 연구

이현우(HyunWoo Lee),김민지(Minji Kim),김연준(Yeonjun Kim),이다현(DaHyun Lee),황진성(JinSeong Hwang),지승한(SeungHan Ji) 한국정보기술학회 2021 Proceedings of KIIT Conference Vol.2021 No.11

본 논문에서는 기존 보안 방안에서 트래픽에 대한 구분이 어려운 점을 베이즈 정리를 바탕으로 스마트팩토리에서 오고 가는 트래픽들에 대해 명확히 구분할 수 있는 방안에 대해 연구하고자 하였다. In this paper, since it is difficult to distinguish ambiguous traffic from existing security measures in smart factories, we studied ways to clearly distinguish traffic coming and going from smart factories based on Bayes" theorem.

H.264/AVC에서의 효율적인 고속 다중 참조 프레임 선택 기법

이현우(Hyunwoo Lee),유종민(Jongmin Ryu),정제창(Jechang Jeong) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.10C

H.264/AVC 동영상 부호화 표준은 높은 부호화 효율을 위해서 가변 블록 크기 부호화, 1/4 화소 정확도의 움직임 예측, 다중 참조 프레임 사용, 율-왜곡 최적화 등과 같은 기법을 도입하였다. 그러나 이러한 부호화 방법들은 움직임 예측에 필요한 복잡도를 크게 증가시키는 단점이 있다. 특히 다중 참조 프레임 움직임 예측을 수행함으로써 증가되는 계산량은 탐색되는 참조 프레임의 개수에 따라 선형적으로 비례하여 늘어난다. 따라서 본 논문에서는 다중 참조 프레임 움직임 예측에서 탐색되는 참조 프레임의 개수를 효율적으로 조절함으로써 복잡도를 크게 줄일 수 있는 방법을 제안한다. 제안하는 알고리듬은 인터 16×16 모드와 인접 블록의 최적 참조 프레임 정보를 이용하여 나머지 화면간 모드들에서의 불필요한 탐색 과정을 생략한다. 실험 결과는 제안하는 방법을 적용함으로써 영상의 화질과 비트율의 큰 변화 없이 부호화 수행 시간을 평균 58.54% 정도의 큰 폭으로 감소시킴을 보인다. 또한 이 방법은 다른 고속 움직임 예측 알고리듬을 같이 적용함으로써 추가적인 성능 향상을 얻을 수 있는 확장성을 가진다. In order to achieve high coding efficiency, H.264/AVC video coding standard adopts the techniques such as variable block size coding, motion estimation with quarter-pel precision, multiple reference frames, rate-distortion optimization, and etc. However, these coding methods have a defect to greatly increase the complexity for motion estimation. Particularly, from multiple reference frame motion estimation, the computational burden increases in proportion to the number of the searched reference frames. Therefore, we propose the method to reduce the complexity by controlling the number of the searched reference frames in motion estimation. Proposed algorithm uses the optimal reference frame information in both P16×16 mode and the adjacent blocks, thus omits unnecessary searching process in the rest of inter modes. Experimental results show the proposed method can save an average of 57.31% of the coding time with negligible quality and bit-rate difference. This method also can be adopted with any of the existing motion estimation algorithm. Therefore, additional performance improvement can be obtained.

자동화수동변속기용 유압 액츄에이터 시스템에 관한 연구

이현우(Hyunwoo Lee),이창훈(Changhoon Lee),양갑진(Kabjin Yang) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Recently, with increased the demand of drivers about safety, convenience, and the need of next-generation vehicles for the enforced regulation to protect the global warming make the trend of the development of the anto-transmission or CVT(Continuous Variable Transmission)that have the maximized and adjusted efficiencies rise continuously. And besides, the traffic jam is getting worse in the city-driving annually all over the world and the driver who is motoring in the city or not good at driving want the vehicle have the auto-transmission to decrease the physical fatigue or inconvenience from the frequent shin and the danger.<br/> In this paper, the development of Automatic Manual Transmission(AMT) and the test facilities is produced for the reverse engineering of the hydraulic actuator system of the AMT in the first year. the mechanism of the auto-clutch system and the control system of manual transmission is understood. On the basis of the above, the research is accomplished that the concept of the part design and manufacturing to develop the hydraulic control system that can make the target manual transmission automatic.<br/>