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RISS 인기검색어
- 검색키워드
- 저자 : 이성근 ( Sung Keun Lee ) (검색결과 287 건)
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이성근,이광철,이승섭,Lee, Sung-Keun,Lee, Kwang-Cheol,Lee, Seung-S. 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.11
Microlenses and microlens arrays are fabricated using a novel fabrication technology based on the exposure of a resist (usually PMMA) to deep X-rays and subsequent thermal treatment. The fabrication technology is very simple and produces microlenses and microlens arrays with good surface roughness (less than 1 nm). The molecular weight and glass transition temperature of PMMA is reduced when it is irradiated with deep X-rays. The microlenses is produced through the effects of volume change, surface tension, and reflow during thermal treatment of irradiated PMMA. The geometry of the microlens is determined by parameters such as the X-ray dose applied to the PMMA, the diameter of the microlens, along with the heating temperature, heating time, and cooling rate in the thermal treatment. Microlenses are produced with diameters ranging from 30 to 1500 ${\mu}{\textrm}{m}$. The modified LIGA process is used not only to construct hemispherical microlenses but also structures that are rectangular-shaped, star-shaped, etc.
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에너지 효율적인 이더넷에서 개선된 LPI 제어 메커니즘
이성근,장용재,유남현,Lee, Sung-Keun,Jang, Yong-Jae,Yoo, Nam-Hyun 한국전자통신학회 2012 한국전자통신학회 논문지 Vol.7 No.5
IEEE 802.3az LPI mechanism allows an Ethernet link to reduce power consumption by entering a low-power sleeping mode and letting some components being powered off when there is no data to be transmitted through the link. However, if small amount of packets are being sent periodically, such a mechanism can not obtain energy efficiency due to a high overhead caused by excessive mode transitions. In this paper, we propose an enhanced LPI mechanism which can perform state transition adaptively based on the traffic characteristics on transport layer and network status. This simulation result shows that proposed mechanism improves energy efficiency than LPI mechanism with respect to energy consumption rate for various traffic loads.
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미골골절이 있는 암성 회음부통증 환자에 시행한 외톨이 교감신경절 차단
이성근(Sung Keun Lee),차영덕(Young Deog Cha),석민 대한통증학회 1997 The Korean Journal of Pain Vol.10 No.2
The perineum is comprised of diverse anatomic structures with mixed sympathetic and somatic in- nervation. The coccyx is innervated by the coccygeal nerves and branches of the fifth sacral root. Recently, ganglion impar block has been introduced as an alternative means of managing intractable pain of sympathetic origin, coccygodynia by trauma, tenesmus and perineal hyperhydrosis. We managed a 59-year-old female patient who had suffered from perineal pain by metastasis of cervical cancer. Approach to impar ganglion through the anococcygeal ligament was impossible because her coccyx was hyperflexed anteriorly by old fracture. But we could perform ganglion impar block successfully by approach through the separation of sacrum and coccyx.
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참여정부 균특회계 지역개발계정사업의 유사ㆍ중복 실태분석
이성근(Lee, Seong-Keun),안성조(Ahn, Sung-Jo),이관률(Lee, Kwan-Ryul) 한국지역개발학회 2009 韓國地域開發學會誌 Vol.21 No.3
The purpose of this study is to analyze the actual state of similar and overlapping special account for balanced national development promoted by Roh"s participatory government for regional development sub-account project. This study drawn out major results as follows. First, the total special accounts for balanced national development promoted by Roh"s participatory government for regional development sub-account project are 123. Among them, the similar & overlapping appeared by both criteria of project purposes and meas classified 84 projects under 26 projects management, indicated the weight of it as 68.3%. Meanwhile, the result of using the questionnaire-based confirmatory factor analysis was discriminated the final similar & overlapping projects as 84 projects under 35 project management. Second, the similar & overlapping project by sector presented respectively higher in the part of setting up RIS in farm and fishing villages(102.516), and in making the region for being a nice place to live(100.464) in similarity and overlapping index compared with backwater region development(98.457), and activation of regional economy(99.633). Third, the actual state of similar and overlapping project in ministries and offices represented that were higher within the ministry in the Office of Forestry(0.67), Ministry of Culture and Tourism(0.33), Home Affairs Ministry(0.33), Construction and Transportation Ministry(0.11), Agriculture and Forestry Ministry(0.04) in the project, on the other hand the Agrarian Development Office(-0.33), Cultural Properties Administration(-1.00), Fire & Rescue Services(-1.00), Finance and Economy ministry(-1.00), Maritime Ministry(-1.00), the Health and Welfare Ministry(-1.00), and Environment Division(-1.00) were higher in similarity and overlapping with other ministries or offices in carrying on the project.
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