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김재하(Kim, Jaeha),안기현(Ahn, Kee-Hyun) 대한건축학회 2016 대한건축학회 학술발표대회 논문집 Vol.36 No.2
This study looks for the new purpose of senior center through analysis of existing facilities which senior use. Based on the analysis, the design direction is decided ; ‘1.Related with local community 2.Generate senior’s economic income 3.Communicate with other age groups 4.Support living and medical care to senior’. Following this direction, the study searches one appropriate design of senior center in the middle of multi family housing buildings. As a result of this study, the senior center examined new purpose as supporting senior’s living in urban area unlike silver town or sanatoriums.
통계적 기법을 활용한 실내 환기성능 평가 기초 프레임워크 개발
김재하(Jaeha Kim),최대인(Daein Choi),김병곤(Byung-gon Kim),채장범(Jang-Bum Chae) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
The purpose of measuring ACH(air change rate) using tracer gas dilution is generally divided into two points of view. Firstly, it can be possible to confirm the factors that affect the cooling and heating loads by HVAC system in residential and commercial facility. Secondly, the inflow of radioactive and toxic chemicals can be indirectly assessed in nuclear and chemical equipment industries to protect workers. However, in the latter case, it entirely cannot help depending on the experience and judgment of skilled test performer whether the concentration data obtained from industrial sites are valid or not in estimating ACH because of the fact that the space has large volume and many occupants frequently go in and out. In this paper, we proposed the statistical framework which is the foundation of diagnosis system for indoor performance measurement. Also, as a case study, the results from before and after application of the framework was compared. This framework can be great contribution to improving reliability of the measurement results of not only ACH but other IAQ(indoor air quality) parameters such as air exchange efficiency and age of air.
Directionally Transparent Energy Bounding Approach for Multiple Degree-of-Freedom Haptic Interaction
김재하(Jaeha Kim),김종필(Jong-Phil Kim),서창훈(Changhoon Seo),류제하(Jeha Ryu) 한국HCI학회 2009 한국HCI학회 학술대회 Vol.2009 No.2
This paper presents a multiple degree-of-freedom (dof) energy bounding approach (EBA) to enhance directional transparency while guaranteeing stability for multiple-dof haptic interaction. It was observed that the passivity condition for multiple ports may lead to some oscillatory limit cycle behaviors in some coordinate directions even though the total sum of energy flow-in is positive, meaning that the system is passive. The passivity condition, therefore, needs to be applied to each coordinate in order to avoid oscillatory behavior by keeping each energy flow-in always positive. For guaranteeing passivity, which in turn, stability in each coordinates, the EBA is applied. For multiple-dof haptic interaction, however, the EBA in each coordinate may distort the direction of the force vector to be rendered since the EBA may cut down the magnitude of the force and torque vectors to be rendered in order to ensure the passivity. For avoiding this problem, a simple projection method is presented. The validity of the proposed algorithm is shown by several experiments.
류제하(Jeha Ryu),김재하(Jaeha Kim),서창훈(Changhoon Seo),임요안(Yo-An Lim),김종필(Jong-Phil Kim) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.4
Haptics technology allows one to interact with virtual environments, augmented environments, and real environments providing tactual sensory information. Science and technology of haptics can in general be classified into three groups: machine haptics, computer haptics, and human haptics. This paper surveys the state-of-the-art of haptic control technology for virtual environments and teleoperation (real environments) and then proposes possible future research directions in the following areas: haptic stability control, bilateral teleoperation control, and stability enhancement control.
서영석(Youngseok Seo),안석(Seok An),김재하(Jaeha Kim),강영길(Younggil Kang),김병기(Byunggi Kim) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.1A
본 논문에서는 MT와 BS에서의 비동기식 전송방식인 MAC에 관한 연구로서 MT와 BS에서의 처리절차를 비교설명하면서 서로의 동작과 차이점에 대한 연구와 후에 성능평가를 할 예정이다. MT의 링크계층은 LAC부계층과 MAC부계층으로 구성된다. LAC부계층은 C-Plane상의 Signaling정보의 신뢰성 있는 송수신을 담당하며, MAC부계층은 C-Plane상의 Signaling정보와 U-Plane상의 User정보를 물리계층을 통하여 BS와 송수신한다. MT의 링크계층은, 링크 계층 사용자가 L3 프로토콜 엔티티일 경우, 이 프로토콜 엔티티와 BS의 L3 프로토콜 엔티티가 메시지를 교환할 수 있도록 MT와 BS 사이의 링크를 제어하는 기능을 수행한다. MT와 BS 사이의 링크 제어는 MAC 부계층이 수행한다. MT의 링크 계층 사용자가 CC, MM, 또는 RRC 프로토콜 엔티티일 경우, 이들 프로토콜 엔티티는 RNC 또는 MSC/SSP에 위치하는 동위 프로토콜 엔티티와 메시지를 교환하여야 한다. MT의 링크 계층은 네트워크 계층 메시지를 RNC까지 전달할 수 있도록 하위의 MAC 부계층에서 MT와 BS 사이의 링크를 제어하는 기능을 제공하고 상위의 LAC 부계층에서 MT와 RNC 사이의 링크를 제어하는 기능을 제공한다. BS의 링크계층은 MT와의 접속부와 RNC와의 접속부로 나누어 진다. MT와의 접속부는 MAC(Medium Access Control) 부계층으로만 구성된다. MAC 부계층은 RFTR의 제어를 받으며, 송수신 되는 네트워크 계층 메시지의 종단점에 따라 메시지를 L3 프로토콜 엔터티로 전달하거나 또는 RNC로 전달하기 위해 Relay를 통해 FCL로 전달한다. RNC와의 접속부는 ATM계층, AAL부계층, FCL부계층, SSCOP부계층, SSCF부계층으로 구성된다.