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CDMA2000 1x 망에서 RLP NAK를 사용한 전송 품질 측정
이준희(Joonhee Lee),차호정(Hojung Cha) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1C
본 논문에서는 CDMA 2000 1x망에 기반한 유무선 통합망에서 무선망의 품질을 측정하기 위해 RLP NAK Rate를 사용하는 방법을 제안한다. 무선망은 유선망과 다른 특성을 가지며 무선망에 적절히 대응하는 적용 알고리즘을 적용하기 위해서는 무선망의 정확한 품질 측정이 필요하다. 이를 위해 유무선 통합망에서 유선의 영향없이 무선망의 품질만을 측정할 수 있는 RLP NAK Rate를 제안하고, 이를 통하여 무선망의 품질을 확인할 수 있음을 실험을 통해 밝힌다.
이준희(Joonhee Lee),이진화(Jinhwa Lee),한성제(Sungje Han) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Since rear torsion beam axle became a popular system of small segment, suspension system has not being developed as rapid as other function like as electrical handling enhancement assist. Relatively this system does not have many control factors to define the performance, in there the bushing is the most critical component to identify vehicle dynamic performance. Also automotive companies choose each their own different direction of rear axle bushing to fulfill their performance target. This paper shows why rear axle bushing direction should be decided first before having a different rubber characteristics, consequently performance development effort will be efficient to meet the target of ride performance, steering performance as well as handling performance in time.
주사음향현미경을 이용한 코발트기 초내열합금 미세조직에 관한 장시간 열영향에 대한 비파괴평가
이준희 ( Joonhee Lee ),김정석 ( Chungseok Kim ) 한국열처리공학회 2019 熱處理工學會誌 Vol.32 No.3
The aim of this study investigates the feasibility of scanning acoustic microscope (SAM) with high frequency transducer for material degradation. The test specimen was prepared by artificial heat treatment of Cobase superalloy. The high frequency 200 MHz acoustic lens was used to generate the leaky surface acoustic wave (LSAW) on the test specimens. The matrix precipitates coarsened with thermal aging time, and then grow up to several tens of micrometers. The velocity of LSAW decreased with increasing aging time. Also, it has a good correlation between LSAW and hardness. Consequently, V(z) curve methods of SAM using high frequency transducer is useful tool to evaluate the heat treatment effects on microstructure. (Received May 8, 2019; Revised May 16, 2019; Accepted May 22, 2019)
이준희(Joonhee Lee),신민철(Mincheol Shin),장용일(Yongil Jang),박상현(Sanghyun Park) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.11
SQLite is a popular relational database management system(RDBMS) mainly used in local application, embedded device, and smartphone. In order to preserve transactional atomicity and durability, SQLite uses recovery schemes that are based on physical logging. Physical logging generates large log file, because whole page is stored even if only a small portion of page is modified. Therefore, log maintenance cost of physical logging is expensive, and it causes delay in applications that use SQLite. In this paper, we propose a new recovery scheme for SQLite, Delta-WAL. Delta-WAL is a recovery scheme based on logical logging, and reduces log size by storing only operation code and input values. In experiment, Delta-WAL generated smaller log compared to existing recovery schemes, and also showed improved transaction throughput.
폐지를 활용한 흡음재의 환경성능 비교를 위한 기초 연구
이준희(Lee Joonhee),양관섭(Yang Kwan-seop),연준오(Yeon Joon-oh),김경우(Kim Kyung-woo) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(계획계)
Widely used sound absorbers in the building such as rock wool and glass wool are not regarded as eco-friendly materials because they consume great amounts of energy and emit considerable greenhouse gases. Therefore, this paper aims to develop eco-friendly acoustic absorbers by using recycling paper. Nowadays, even though many eco-friendly absorbers are being developed, they don’t present any quantitative data to prove their environmental excellence. Thus, this paper presents comparison and analysis of the used energy amounts and emitted greenhouse gases of typical sound absorbers in the market to assess the developed absorber of this research.