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센서 네트워크의 데이터 수집기에 대한 프로토콜 설계 및 구현
이재권(JaeKwon Lee),곽윤식(Yoonsik Kwak) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.5
In this paper, in order to effectively communicate with data between data collectors and sensor tags, and monitoring system, we designed and implemented the protocols of data collector in sensor network systems. Also, in order to shirk the collision of signals to be simultaneously happened by sensor tags, we implemented and adapted the algorithm of wireless collision avoided type ? random delay algorithm by vibration during moving, synchronizing Beacon algorithm for collectors. As a result of experiment, we could obtain the consistency, reliability, and stability of systems. Also, through operating and deploying sensors and communication devices at apple’s farms, proposed protocols were identified the possibility for goods.
Design and Implementation of a Data Extraction Tool for Analyzing Software Changes
Yong-Hyeon Lee(이용현),Kisub Kim(김기섭),Jaekwon Lee(이재권),Woosung Jung(정우성) 한국컴퓨터정보학회 2016 韓國컴퓨터情報學會論文誌 Vol.21 No.8
In this paper, we present a novel approach to help MSR researchers obtain necessary data with a tool, termed General Purpose Extractor for Source code (GPES). GPES has a single function extracts high-quality data, e.g., the version history, abstract syntax tree (AST), changed code diff, and software quality metrics. Moreover, features such as an AST of other languages or new software metrics can be extended easily given that GPES has a flexible data model and a component-based design. We conducted several case studies to evaluate the usefulness and effectiveness of our tool. Case studies show that researchers can reduce the overall cost of data analysis by transforming the data into the required formats.
UHD 난시청 해결을 위한 UHD-TVR 국산화 개발 및 필드테스트
박승근(Park Seungkeun),이재권(Lee Jaekwon),고우종(Koh Woojong),장호진(Jang Hojin),박민호(Park Minho),정종완(Jeong Jongwan),정재갑(Jung Jeagab),전성상(Jung Sungsang),김재만(Kim Jaeman),김형석(Kim Huengsug),김재경(Kim, Jaekyung) 한국방송·미디어공학회 2019 한국방송공학회 학술발표대회 논문집 Vol.2019 No.11
국내 지상파 방송 3사는 세계최초로 2017년에 지상파 UHD 본방송 서비스를 시작하였다. 지상파 UHD 방송은 ATSC 3.0 표준 기반으로 단일주파수로 방송망을 구축할 수 있으므로, 각 송신소별 커버리지 중첩지역에서 방송망을 효율적으로 설계하는 것이 필요하다. 또한, ATSC 3.0 송신 장비를 실 방송환경에서 운용하기 위해서는 H/S와 같은 안정적인 형태로 장비가 구축되어야 한다. 본 논문에서는 2017년 수도권 UHDTV 본방송이 진행된 이후, KBS에 구축한 수도권 UHD-TVR 구축 과정과 수도권 UHDTV 방송망 분석을 위한 필드테스트 결과에 대해 살펴보고자 한다.
안압조절용 마이크로 체크밸브의 설계변수에 따른 특성평가
임성민(Seongmin Im),문승환(Seunghwan Moon),이재권(Jaekwon Lee),이종현(Jonghyun Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
A novel glaucoma drainage device (GDD) for the regulation of intraocular pressure is presented. The device features a passive micro check valve, consisting of three biocompatible polymer layers. Finite Element Analysis (FEA) was performed to find an optimal design of the device. The cracking pressure of the fabricated polymeric micro check valves was found as 1.80㎪, 1.66㎪, and 1.49㎪, all of which met the requirement of target pressure of 1.3~2 ㎪ for in-vivo experiment. It is confirmed that the proposed micro check valve can effectively regulate the intra ocular pressure in the treatment of glaucoma disease.