• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.791-794
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• 2008

최근 홈오토메이션 시스템(Home Automation System) 즉, 가정 자동화 시스템에 대한 관심과 수요가 커지면서 이를 위한 네트워크 구축에 관한 여러 연구 및 개발이 활발히 이루어지고 있다. 홈오토메이션 시스템이란 가정에서 사용되는 여러 가전기기 및 센서장비를 이용하여 집 안의 기기를 제어함으로써 가정을 안전하게 관리하고, 사용자의 편의를 극대화하여 인간의 생활수준을 향상시키는 기술을 말한다. 본 논문에서는 Cypress사의 PSoC 기반으로 가정 내에서 사용할 수 있는 온도, 습도, 가스검출, 불꽃감지와 같은 여러 환경 센서 및 인체감지센서를 이용한 방범 센서 장치 구현방법을 제안하고, PSoC 기반의 WirelessUSB를 이용하여 센서 및 호스트 PC와의 네트워크 시스템을 구축한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.01a
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• pp.341-345
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• 2009

We present an augmented reality (AR) application for cell phone where users put a virtual pet on their palms and play/interact with the pet by moving their hands and fingers naturally. The application is fundamentally based on hand/palm pose recognition and finger motion estimation, which is the main concern in this paper. We propose a fast and efficient hand/palm pose recognition method which uses natural features (e.g. direction, width, contour shape of hand region) extracted from a hand image with prior knowledge for hand shape or geometry (e.g. its approximated shape when a palm is open, length ratio between palm width and pal height). We also propose a natural interaction method which recognizes natural motion of fingers such as opening/closing palm based on fingertip tracking. Based on the proposed methods, we developed and tested the AR application on an ultra-mobile PC (UMPC).

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.330.1-330.1
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• 2014

개인용 노트북, 태블릿 PC, 핸드폰 기술 발전에 의해 언제 어디서나 데이터를 작성하고 기록하는 일들이 가능해졌다. 특히 cloud 시스템을 이용하여 데이터를 휴대기기에 직접 저장하지 않고 server에 기록하는 일들이 가능해짐에 따라 server 기기의 성능, server-room power 및 space 에 대한 관심이 증가하였다. Storage class memory (SCM) 이란 memory device와 storage device의 장점을 결합한 memory를 일컫는 기술로 현재 소형 디바이스 부분부터 점차 그 영역을 넓히고 있다. 그중 phase change material을 이용한 phase change memory (PCM) 기술이 가장 각광받고 있다. PCM의 경우 scaling됨에 의해 cell간의 열 간섭으로 인한 data 손실의 우려가 있어 cell의 면적을 최소화 하여 소자를 제작하여야 한다. 기존의 sputtering등의 PVD 방법으로는 한계가 있어 ALD 공정을 이용한 PCM에 대한 연구가 활발히 진행중이다. 특히 tellurium 원료기체로 silyl 화합물 [1]을 사용하여 주로 $Ge_2Sb_2Te_5$의 조성에 초점을 맞춰 진행되고 있으나, 세부 공정에 대한 기본적인 연구는 미비하다. 본 연구에서는 Ge-Sb-Te 3원계 박막을 형성하기 위한 Sb-Te 화합물의 증착 공정에 대한 연구를 수행하였다. 특히 원료기체로 Si이 없는 새로운 Te 원료기체를 이용하여 조성 조절을 하였고, 박막의 물성을 분석하였다. 또한 공정온도에 따른 박막의 물성 변화를 분석하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.07a
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• pp.181-184
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• 2003

In this paper, we investigated the position-dependent stress distribution of indium-tin-oxide (ITO) film on Polycarbonate (PC) substrate by external bending force. It was found that there are the maximum crack density at the center position and decreasing crack density as goes to the edge. In accordance with crack distribution, it was observed that the change of electrical resistivity of ITO islands is maximum at the center and decrease as goes to the edge. From the result that crack density is increasing at same island position as face-plate distance (L) decreases, it is evident that the more stress is imposed on same island position as L decreases.

• Journal of KIISE:Computer Systems and Theory
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• v.32 no.11_12
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• pp.705-716
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• 2005

There exist many feature point detection algorithms that developed in pattern recognition research . However, interactive applications for the pen-input displays such as Tablet PCs and LCD tablets have set different goals; reliable segmentation for different drawing styles and real-time on-the-fly fieature point defection. This paper presents a curvature estimation method crucial for segmenting freeHand pen input. It considers only local shape descriptors, thus, peforming a novel curvature estimation on-the-fly while drawing on a pen-input display This has been used for pen marking recognition to build a 3D sketch-based modeling application.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.837-840
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• 2003

PDA와 같은 휴대용 컴퓨터는 장소에 구애받지 않고 어디에서든지 사용할 수 있다는 장점이 있다. 본 논문에서는 이러한 PDA의 장점을 살려 여행자들이 여행을 하는 도중 어디서든지 부산경남 지역의 문화 관광 정보 및 숙박 시설 등에 대한 정보를 안내받을 수 있는 휴대용 문화관광 안내 시스템을 개발하였다. 개발된 시스템은 ADOCE(Microsoft ActiveX Data Objects for Windows CE)를 이용 데이터베이스와의 연동으로 부산 경남의 문화 관광 정보, 테마 언행, 숙박시설, 교통, 먹거리 등에 대한 정보들을 단순한 텍스트 정보만이 아닌 동영상, 음성, 지도 정보 등으로 제공한다. 여행자들에게 현 위치에서 다른 위치로 이동하고자 한 때 필요한 대략적인 지리 정보와 이동 거리 등에 대한 정보를 제공한다. 또한 여행자들이 관광지에 대한 여행기를 펜과 음성으로 기록하여 PC로 전송할 수 있는 기능을 제공한다.

• 한국신재생에너지학회:학술대회논문집
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• 2009.11a
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• pp.247-250
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• 2009

This study considers the feasibility of using the low cost assembled separator. The graphite plate has been widely used as the separator in the field of PEMFCs(Polymer electrolyte membrane fuel cell) industry because of its excellent material properties such as good corrosion resistance, good electrical conductance and so on. However, there are some problems for the commercialization due to its poor cost effectiveness for the large volume manufacturing and lack of mechanical strength. From this respect, this study has focused on the manufacturing technology in order to reduce the price for the commercialization of separator. This study also shows that the assembled separator of the suggested structure, which is composed of grafoil and PC(PolyCarbonate) materials, could be manufactured at low cost enough for the mass production. The flow fields produced by cutting foils and the base plates of the separators were simply made by mechanical work.

• Journal of the Korean Society for Precision Engineering
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• v.32 no.7
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• pp.653-660
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• 2015

This paper describes the design of the force measuring system for an industrial robot's deburring work. The force measuring system is composed of a three-axis force sensor, a measuring device, a housing and a cover. The three-axis force sensor can detect x-direction force, y-direction force and z-direction force at the same time. The measuring device is designed using DSP(Digital Signal Processor), and have a RS-232 and a RS-485 communication port for sending force data to PC or other controller. As a result of test, the repeatability error and the non-lineality error of the three-axis force sensor are less than 0.03%, and the interference error of the sensor is less than 0.95%. It is thought that the force measuring system can be used for an industrial robot's deburring work.

• International Journal of Aeronautical and Space Sciences
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• v.4 no.1
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• pp.34-44
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• 2003

An advanced aeroelastic analysis using a computational structural dynamics (CSD), finite element method (FEM) and computational fluid dynamics (CFD) is presented in this Paper. A general aeroelastic analysis system is originally developed and applied to realistic design problems in the transonic flow region, where strong shock wave interactions exist. The present computational approach is based on the modal-based coupled nonlinear analysis with the matched-point concept and adopts the high-speed parallel processing technique on the low-cost network based PC-clustered machines. It can give very accurate and useful engineering data on the structural dynamic design of advanced flight vehicles. For the nonlinear unsteady aerodynamics in high transonic flow region, Euler equations using the unstructured grid system have been applied to easily consider complex configurations. It is typically shown that the advanced numerical approach can give very realistic and practical results for design engineers and safe flight tests. One can find that the present study conducts a virtual flutter flight test which are usually very dangerous in reality.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.9C
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• pp.1306-1315
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• 2004

UWB, which is now in a process of being standardized in WPAN communication, has some problems such as difficulty of implementation and interference with existing systems. To overcome these problems we will explain the MIMO structure to alleviate difficulties of implementation. In this paper we propose the UWB transceiver structure using multiband scheme to mitigate narrow band interference from PCS Of WLAN which is widely used these days and analyze the effect of noise and narrow band interference by simulation based on numerical analysis.