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.

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

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>

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>

퇴직공무원의 전문성 활용 필요성과 취업제한 기간에 대한 선호

이재완 ( Lee Jaewan ) 한국행정학회 2021 韓國行政學報 Vol.55 No.2

우리 정부는 공직자의 이해충돌을 방지하기 위한 제도적 장치의 하나로 퇴직공무원 취업제한 기간을 설정하고 있는데, 그 기간을 장기화하면 퇴직공무원의 전문성이 떨어진다는 문제가 있다. 따라서 본 연구에서는 퇴직공무원의 전문성 활용의 필요성이 취업제한 기간 선호에 미치는 효과 및 취업제한의 부패 예방효과가 미치는 조절효과를 분석하고자 하였다. 본 연구에서는 취업제한 기간을 ‘제한기간 폐지’, ‘3년 이하 단축’, ‘3년 유지’, ‘3년 이상 연장’ 등으로 제시하고 여러 대안들 중 하나를 선호하도록 설정하였다. 따라서 취업제한 기간 선호에 미치는 효과를 다항로짓모형으로 분석하였다. 그 분석결과, 기준범주인 ‘3년 유지’에 비해 전문성 활용 필요성을 높게 인식할수록 ‘제한기간 폐지’에 대한 선호가 높았으며, 부패 예방효과를 높게 인식할수록 ‘3년 이상 연장’에 대한 선호가 높았다. 조절효과의 경우 부패 예방효과는 ‘제한기간 폐지’에 대한 전문성 활용 필요성의 긍정적 효과를 약화시켰으며, ‘3년 이상 연장’에 대한 전문성 활용 필요성의 부정적 효과를 약화시키는 것으로 나타났다. 본 연구의 시사점은 전문성 활용과 이해충돌 방지라는 가치 대립 상황에서 퇴직공무원의 취업제한 기간의 변경은 공무원의 부패 수준에 따라 달리 설정되어야 한다는 점이다. This study analyzes the effect of a perceived necessity of leveraging retired civil servants' expertise on a preference for a post-employment restrictive period. In addition, whether a perceived corruption-prevention effect of the restrictive period moderates the relationship is analyzed. A multi-logit model was employed for the analysis. The results reveal that, vis-a-vis the “entrenchment of the status quo,” which is the reference category of this study, the higher the perceived necessity of leveraging retired civil servants, the greater the preference for the “abolition of restrictions on post-employment;” and the higher the perceived corruption-prevention effect of the restrictive period, the greater the preference for the “extended post-employment restriction period to more than three years.” In addition, the perceived corruption prevention effect of the restrictive period attenuates negative effects of the perceived necessity on the “abolition of restrictions on post-employment.” The findings of this study suggest, given that there is an ongoing debate on leveraging retired civil servants' expertise versus preventing conflicts of interest, the extent to which civil servants are exposed to corruption should be considered when making changes to the current post-employment restriction system.

중앙정부의 지방자치단체 유사ㆍ중복 사회보장사업 정비조치에 대한 비판적 고찰

이재완(Lee, Jaewan) 한국지역사회복지학회 2016 한국지역사회복지학 Vol.0 No.56

본 연구는 중앙정부에 의한 지방자치단체 유사·중복 사회보장사업 정비 조치에 대해 중앙과 지방정부의 역할과 기능의 측면에서 비판적으로 검토하였다. 지방자치 20년을 맞이하고 있는 현재 중앙정부가 지방정부의 사회복지사업에 대한 구체적으로 개입하는 것은 지역복지사업의 통제이며 지방자치의 훼손이다. 지방자치하에서 중앙·지방정부의 역할과 기능의 변화 그리고 특징에 대해 살펴보았다. 또한 지방자치단체 유사·중복 사회보장사업 정비에 대해 법률적 측면과 정비사업 및 기준의 측면에서 지역복지 발전을 역행하는 논거를 제시하였다. 중앙정부의 지방정부 사회보장사업 유사·중복 사업에 대한 통·폐합조치는 헌법과 지방자치법, 사회보장기본법 그리고 사회보장급여법 등에서 명시하고 있는 지방자치단체의 주민복지증진에 관한 내용과 충돌이 발생한다. 또한 지방정부 사회보장사업은 중앙정부 사업의 보충적 사업으로 지역현실에 기반하여 복지사각지대 해소와 틈새를 채우는 사업이다. 중앙정부에 의한 지방정부의 사회보장 유사·중복 사회보장정비는 주민의 복지니즈와 선택권 그리고 지역사회의 고유성과 개별성인 지역성을 존중하지 않은 조치이다. 중앙정부와 지방정부는 상호신뢰에 기초하여 복지정책의 융합을 모색해야 한다. 중앙정부는 지방자치의 발전과 지역복지의 활성화를 위해서 분권적 복지행정체계를 확충하는 노력을 해야 한다. This study was critically reviewed in terms of the roles and functions of central and local government for local governments and multiple social welfare like measures by the central government. The central government control of community welfare to intervene in social welfare service of local government is destruction of local self-government. It is worried the central government has been taking actions forcefully by selecting the project, looking at the social welfare measures. There are 1496 social welfare services that the central government determined as Similar and overlapping social welfare service in the local government. This study looked at the changes and characteristics of the roles and functions of the central and local governments. In addition, the problems of multiple and similar social welfare of local governments were evaluated in terms of the legal aspects and policy contents. Actions to refine Social Security regarding similar and overlapping measures of local governments by the central government have not respected the welfare needs and choices of the residents and the locality. Central and local governments based on mutual trust should seek convergence of welfare policy. The central government should make efforts to expand the welfare decentralized administrative system in order to activate the development and welfare of the local governments.

발전용 리니어엔진의 컨덕턴스에 따른 동적특성 및 연소특성에 관한 연구

이재완(Jaewan Lee),오용일(Yongil Oh),김강출(Gangchul Kim),임옥택(Ocktaeck Lim),양지웅(Jiwoong Yang) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11

Linear engine has the advantage in the volume and weight by the crankless structure. Thus, linear engine was easy to apply linear engine to hybrid vehicles. But linear engine was not commercialized because of difficulty of engine control. This study development Power pack of linear engine. The Power pack that constituted linear engine, compressors and linear alternators was 12.8kg. Fuels of propane delivered combustion cylinder through compressors by a carburetor. The conductance was changed from 0.04 to 0.16mho. And the ignition timing was 5.05mm before maximum stroke. As a result, when the conductance increased, frequency, strok, input calories, maximum pressure and thermal efficiency were decreased trends, and IMEP and electric power were increased trends.