수소연료전지 자동차 세계기술규정 제정 현황 고찰

이재완(Jaewan Lee),이광범(Kwangbum Lee),이종현(Jonghyun Lee),용기중(Geejoong Yong) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

실사고 데이터를 이용한 EES에 따른 인체상해도 경향성 분석

이승상(Seungsang Lee),송영준(Youngjun Song),윤영한(Younghan Youn),이재완(Jaewan Lee),김시우(Siwoo Kim),이강현(Kanghyun Lee),이희영(Heeyoung Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5

Currently frontal crash safety evaluation is conducted by crashing a vehicle against a rigid barrier in Korea. It evaluate crash performance of a vehicle in a barrier test in terms of vehicle stiffness and strength. But this method is basic test. Probably, This test isn’t matched in Real World Crash Collision about occupant injury. So The availability of in-depth accident data is prerequisite for each efficient traffic safety management system. In this study, As using photo modeler program, It finds out relationship between occupant injury based on AIS and Estimated Energy Equivalent Speed in the real world in-depth accident data and compares crashing a vehicle test against a rigid barrier by using Madymo to Estimated Energy Equivalent Speed in the Real World in-depth accident data. Using Real World in-depth accident data is essential part of improving vehicle safety and reduction of traffic fatality in Korea.

A phase-modulated laser system of ultra-low phase noise for compact atom interferometers

Lee, Ki-Se,Kim, Jaewan,Lee, Sang-Bum,Park, Sang Eon,Kwon, Taek Yong Korean Physical Society 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.2

<P>A compact and robust laser system is essential for mobile atom interferometers. Phase modulation can provide the two necessary phase-coherent frequencies without sophisticated phase-locking between two different lasers. However, the additional laser frequencies generated can perturb the atom interferometer. In this article, we report on a novel method to produce a single high-power laser beam composed of two phase-coherent sidebands without the perturbing carrier mode. Light from a diode laser is phase-modulated by using a fiber-coupled electro-optic modulator driven at 3.4 GHz and passes through a Fabry-Perot cavity with a 6.8 GHz free spectral range. The cavity filters the carrier mode to leave the two first-order sidebands for the two-photon Raman transition between the two hyperfine ground states of Rb-87. The laser beam is then fed to a single tapered amplifier, and the two sidebands are both amplified without mode competition. The phase noise is lower than that of a state-of-the-art optically phase-locked external-cavity diode laser (-135 dBrad(2)/Hz at 10 kHz) at frequencies above 10 Hz. This technique can be used in all-fiber-based laser systems for future mobile atom interferometers.</P>

Electrical and mechanical property of ZnO wire using catalyst-free chemical vapor deposition

Lee Jinkyung,Jung Unseok,Kim Hakseong,Yun Hoyeol,Seo Miri,Jonathan Ho,MiriChoi Jaewan,Kim Gyutae,Lee Sangwook 한국진공학회 2011 한국진공학회 학술발표회초록집 Vol.40 No.0

Advanced braking algorithm for robust longitudinal risk management

Lee, Taeyoung,Kim, Taewoo,Kim, Beomjun,Yi, Kyongsu,Lee, Jaewan Professional Engineering Publishing Ltd 2016 Proceedings of the Institution of Mechanical Engin Vol. No.

<P>This paper describes an advanced braking algorithm for robust longitudinal risk management to prevent or mitigate rear-end collisions. Since the proposed safety system works in conjunction with a human driver, the longitudinal safety system must be acceptable to the driver. The key to achieving this is to ensure that control signals are given at the appropriate time. In order to construct an suitable control system, a new longitudinal safety index was developed by using the time to collision and the warning index, which are well-known safety parameters in longitudinal safety control. The clearance and the relative velocity constitute essential signals for safety monitoring in longitudinal safety control. These measured sensor signals include the uncertainty in the measurement noise. To design a robust safety monitoring and control mode decision, information consisting of fusion of the measurement signals was obtained. In addition, an expected error range of the proposed safety index from the measurement noise can be defined from the covariance matrix of the Kalman filter and the deviation of the function of the new longitudinal safety index. The control performance of the proposed algorithm was evaluated by analysis of the simulation results. From this analysis, it can be concluded that the proposed advanced braking algorithm can substantially enhance the longitudinal safety and can guarantee a robust performance with respect to the sensor uncertainty.</P>

Duality in entanglement of macroscopic states of light

Lee, Su-Yong,Lee, Chang-Woo,Kurzyń,ski, Paweł,Kaszlikowski, Dagomir,Kim, Jaewan American Physical Society 2016 Physical Review A Vol.94 No.2

<P>We investigate duality in entanglement of a bipartite multiphoton system generated from a coherent state of light. The system can exhibit polarization entanglement if the two parts are distinguished by their parity, or parity entanglement if the parts are distinguished by polarization. It was shown in Phys. Rev. Lett. 110, 140404 (2013) that this phenomenon can be exploited as a method to test indistinguishability of two particles and it was conjectured that one can also test indistinguishability of macroscopic systems. We propose a setup to test this conjecture. Contrary to the previous studies using two-particle interference effect as in the Hong-Ou- Mandel setup, our setup neither assumes that the tested state is composed of single particles nor requires that the total number of particles be fixed. Consequently, the notion of entanglement duality is shown to be compatible with a broader class of physical systems. Moreover, by observing duality in entanglement in the above system one can confirm that macroscopic systems exhibit quantum behavior. As a practical side, entanglement duality is a useful concept that enables adaptive conversion of entanglement of one degree of freedom (DOF) to that of another DOF according to varying quantum protocols.</P>

Any multipartite entangled state violating the Mermin-Klyshko inequality can be distilled for almost all bipartite splits

Lee, Soojoon,Lee, Jinhyoung,Kim, Jaewan American Physical Society 2009 Physical review. A. Atomic, molecular, and optical Vol.79 No.3

<P>We study the explicit relation between violation of Bell inequalities and bipartite distillability of multiqubit states. It has been shown that even though for N >= 8 there exist N-qubit bound entangled states which violates a Bell inequality [W. Dur, Rev. Lett. 87, 230402 (2001)], for all the states violating the inequality there exists at least one splitting of the parties into two groups such that pure-state entanglement can be distilled [A. Acin, Rev. Lett. 88, 027901 (2002)]. We here prove that for all N-qubit states violating the inequality the number of distillable bipartite splits increases exponentially with N, and hence the probability that a randomly chosen bipartite split is distillable approaches 1 exponentially with N, as N tends to infinity. We also show that there exists at least one N-qubit bound entangled state violating the inequality if and only if N >= 6.</P>

최근 우주법의 주요 문제

이재완(Lee Jaewan) 한림대학교 법학연구소 2004 한림법학 FORUM Vol.14 No.-

Even with no work of codifying treaty or principle relating to outer space and no concrete progress in the discussion of the definition and delimitation of outer space since the UNISPACE Ⅲ, the Legal Subcommittee of COPUOS has played a pivotal role of clarifying and elaborating main concept and principle of space law through its constructive process of discussions. First of all, character and utilization of Geostationary Orbit(GSO) has been determined as a result of compromise between space-faring and non-space-faring countries. In return for giving up its persistent claim of sovereignty or preferential right towards GSO, developing countries have been acquired equitable access to GSO. This will be recorded as a good precedent of how the principle of international cooperation can be realized in the area of space law. Driven by recent increase in space activities of private company, current space law has manifested its limitations in application. The Legal Subcommittee has recently adopted a draft UN General Assembly resolution relating to the concept of launching State, to be submitted to the 59th UN General Assembly in 2004. When such draft will get approval from UN General Assembly, it will certainly stimulate the codification of domestic legislation on outer space for all UN Members and will contribute toward enhancing the effectiveness of space law through harmonizing each domestic space law on a voluntary basis. Another issue deserving consideration that is still under way of discussion in the Legal Subcommittee is the preparation for a space asset protocol. This protocol aims at facilitating funding for owner of space objects through establishing an international registry. Discussions in the Subcommittee focus on (a) the appropriateness of UN as a Supervisory Authority in the protocol and (b) relationship of such protocol with the existing space law. They will be expected to contribute to the expansion of the area of current space law and to bringing about the clarification and elucidation of main concepts of space law through constructive dialogue between public and private sides of space law.

BCI, VR기기를 활용한 단편 영화 관람객의 감정 및 몰입도 분석

박재완(Jaewan Park),이성은(Sungeun Lee),강두혜(Duhye Kang),김소연(Soyeon Kim),이상원(Sangwon Lee) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2

본 논문에서는 뇌과학 분야에서 활용되는 Brain Computer Interface(BCI)와 가상현실(Virtual Reality, VR) 장비를 활용하여 관람객의 감정상태, 몰입도를 분석한다. 비교실험설계를 위해 실험군은 가상현실 장비를 활용하여 단편 애니메이션을 시청한 관람객 대상이며, 대조군은 13 인치 노트북에서 단편 애니메이션을 시청한 관람객으로 선정하였다. 비교분석은 BCI 장비를 통하여 뇌파 EEG 데이터를 추출하며 신호를 주파수 대역별 (알파, 베타, 델타, 세타, 감마파)로 분류하여 분석한다. 감정분석으로 각 파형의 신호 특징을 파악하여 내면 심리, 표면 심리상태를 결과를 도출, 몰입도는 관람객이 집중할 때 활성화되는 알파, 베타파 분석을 통하여 결과를 확인한다. 이후 실험군과 대조군의 결과를 통합적으로 분석하여 감정변화 양에 따른 몰입도의 차이와 VR 장비의 유용성에 대해서 논의한다. 뇌과학 응용 실험을 위한 초석을 다져 후배 연구자들이 보다 더 쉽게 뇌과학 응용분야를 쉽게 접근할 수 있게 하는 것을 목표로 하고 있다.

도암호 상류 흙탕물 발생 원인 파악을 위한 하천 수질 정밀 모니터링

이재완 ( Jaewan Lee ),홍은미 ( Eunmi Hong ),권혁준 ( Hyeokjoon Kwon ),임경재 ( Kyungjae Lim ),임정하 ( Jungha Lim ),류동우 ( Dongwoo Ryu ),정동성 ( Dongseong Jeong ) 한국농공학회 2019 한국농공학회 학술대회초록집 Vol.2019 No.-

강우 시 주로 유출되는 비점오염원은 주로 기후에 의해 간헐적이거, 분사된 형태로 호소로 유 입되며, 오염원이 분산되어 분포하기 때문에 유입 경로를 파악하기 어렵고, 측정 및 영향 평가가 용이하지 않아 많은 연구가 필요하다. 국내의 대표적 고랭지 농업지역인 도암댐 유역은 강우시 토양의 침식과 더불어 고농도의 탁수가 발생하고 있다. 특히 탁수를 유발하는 토양유실은 강수요인 (강수량, 강우 지속시간, 강우강도)과 영농조건 (재배작물, 경운방법) 그리고 경사도 등 환경조건의 영향을 받기 때문에 발생원에서 토양유실을 제어할 수 있는 대책이 보다 효율적일 수 있다. 따라서, 본 연구에서는 도암호 유역 상류 지역에서 강우시 흙탕물 발생 원인 파악을 위하여 2018년 8월 15일 태풍 크로사 발생에 따른 흙탕물 발생 경로 및 하천 수질의 정밀 모니터링을 수행하였다. 상류 지류, 지천의 합류지점이며 동시에 도암대 유입 지점인 송천 (S5)에서부터 정밀 모니터링을 시작하여 도암호 유역의 송천, 차항천, 횡계천, 용산천의 본류 및 지류를 따라 상류지점으로 올라가며 48개의 지점에서 흙탕물 발생지점을 현장 확인하여, 흙탕물 발생 원인을 파악하고, 수질 시료를 채취하여 총인 (TP), Suspended Solids (SS), 탁도 등을 분석하였다. 하천 수질 정밀 모니터링 결과, 하천의 하류 지점이 상류지점과 비교하여 전반적으로 탁도가 높았으나, 하천의 상류 지점도 퇴적된 토사, 고랭지 농업, 노출된 산림에서의 산사태 등으로 흙탕물이 다량 발생하였다. 본 정밀 모니터링 결과를 활용하여 탁수 및 흙탕물 발생 수질오염 유발 가능 지역에 대한 파악이 가능할 것으로 판단된다.