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CO_2 레이저빔을 이용한 TFT-LCD 도광판의 패턴 제작에 관한 연구
김경동,백창일,송철기,안성훈 경상대학교 생산기술연구소 2002 工學硏究院論文集 Vol.2 No.-
A light guide panel is an element of the LCD backlight module that is often used for the display of compact electronic devices. In this study, a laser marking system is proposed to fabricate light guide panel, which can replace other manufacturing methods such as silk printing, stamping, or v-cutting methods. The objective of this research is to evaluate the process parameters of the laser marking system. Light guide patterns were marked with a 50W CO_2 laser(CW) to understand the effects of average power and scanning speed on the geometry and quality of groove pattern. The width of the fabricated grooves increases with increasing laser power and decreasing scan speed. In order to analyze surface characteristics and optical properties(luminance, uniformity), SEM photography and BM7(luminance measuring system) were used. As a result, the optimal conditions of the process parameters that provide high luminance was obtained.
DNS Resolution with Renewal Using Piggyback
Jang, Beak-Cheol,Lee, Dong-Man,Chon, Kil-Nam,Kim, Hyun-Chul The Korea Institute of Information and Commucation 2009 Journal of communications and networks Vol.11 No.4
Domain name system (DNS) is a primary identification mechanism for Internet applications. However, DNS resolutions often take an unbearably long time, and this could seriously impair the consistency of the service quality of Internet applications based on DNS such as World Wide Web. Several approaches reduce DNS resolution time by proactively refreshing expired cached records or prefetching available records beforehand, but these approaches have an inherent problem in that they cause additional DNS traffic. In this paper, we propose a DNS resolution time reduction scheme, named renewal using piggyback (RUP), which refreshes expired cached records by piggybacking them onto solicited DNS queries instead of by issuing additional DNS queries. This method decreases both DNS resolution time and DNS traffic since it reduces the number of queries generated to handle a given DNS resolution without generating additional DNS messages. Simulation results based on two large independent DNS traces show that our proposed approach much reduces not only the DNS resolution time but also the DNS traffic.
이동철,백승희,손욱진,신규식,한재형 대한슬관절학회 2002 대한슬관절학회지 Vol.14 No.2
목적: 퇴행성 슬관절염에서 골관절염의 정도, 비만도, 대퇴 경골 정렬에 따른 히야루론산의 임상효과를 알아보고자 하였다. 대상 및 방법: 퇴행성 슬관절염 환자 73명을 대상으로 53명에게는 히야루론산(히야루론산 Purpose: The Purpose was to evaulate the efficacy of sodium hyaluronate (HA) according to the degree of osteoarthritis, body mass index and tibiofemoral alignment. Materials and Methods: 53 of 73 patients who had osteoarthritis of the knee were underwent intraarticular injection weekly for 5 weekly for 5 weeks with hyaluronic acid (HA, hyruan®, MW:1MDa) and 20 of 73 ticular injection weekly for 5 weeks with placebo (normal saline). The patients were followed for 27 weeks. Results were evaluated with wvisual analogue scale for pain, Lequesne algofunctional index for functional severity and Tegner activity score for activity. The degree of severity of osteoarthrtis of knee was stratified by Kellgren classification. Results: In the group treated with HA, the patients classified as Kellgren classificanton Ⅱ and Ⅲ showed much better improvement in efficacy for pain, function and activity compared with group Ⅳ. In the femorotibial alignment, neutral and valgus alignment group showed better results that varus group. There is no statistical significance in the knee pain and function between normal and overweight group. Best symptomatic improvement according to the subjective symptom revealed at 3 week in 25 patients (47.2%). Placebo treated patients had slight pain and improved functional perfomance but less effect in compared with HA treated patients. Conclusion: Intraarticular administration of HA relieve the symptom of osteoarthritis and improve the function of knee joint. Especially, the patients classified with Kellgren classification Ⅱ, Ⅲ and valgus, neutral tibiofemoral alignmen groups showed much better improvement than grade Ⅳ and varus group.
Kim, Hyun-Chul,Lee, Dong-Man,Chon, Kil-Nam,Jang, Beak-Cheol,Kwon, Tae-Kyoung,Choi, Yang-Hee The Korea Institute of Information and Commucation 2010 Journal of communications and networks Vol.12 No.1
Since large objects consume substantial resources, web proxy caching incurs a fundamental trade-off between performance (i.e., hit-ratio and latency) and overhead (i.e., resource usage), in terms of caching and relaying large objects to users. This paper investigates how and to what extent the current dedicated-server based web proxy caching scheme is affected by large file transfers in a high bandwidth campus network environment. We use a series of trace-based performance analyses and profiling of various resource components in our experimental squid proxy cache server. Large file transfers often overwhelm our cache server. This causes a bottleneck in a web network, by saturating the network bandwidth of the cache server. Due to the requests for large objects, response times required for delivery of concurrently requested small objects increase, by a factor as high as a few million, in the worst cases. We argue that this cache bandwidth bottleneck problem is due to the fundamental limitations of the current centralized web proxy caching model that scales poorly when there are a limited amount of dedicated resources. This is a serious threat to the viability of the current web proxy caching model, particularly in a high bandwidth access network, since it leads to sporadic disconnections of the downstream access network from the global web network. We propose a peer-to-peer cooperative web caching scheme to address the cache bandwidth bottleneck problem. We show that it performs the task of caching and delivery of large objects in an efficient and cost-effective manner, without generating significant overheads for participating peers.
Song, Kwan-Jeong,Beak, Dong-Chul,Kim, You-Wang,Kim, Young-Geol,Lee, Min-Seok,Lee, Sam-Pin,Kim, Chan-Shick The Korean Society of Food Science and Nutrition 2010 Preventive Nutrition and Food Science Vol.15 No.3
Caffeine and catechins from the Yabukita, Yutakamidori, Saemidori, Okumidori, and Fushun varieties of tea leaves picked during different harvesting seasons from April to October were evaluated using HPLC. Total content of catechins increased greatly with the later harvesting time of tea leaves (i.e., picking the leaves in September versus in April) and decreased slightly after September. Yabukita tea leaves picked in August contained 43.1 mg% catechins including EGC, EC, ECG, and EGCG, with the ECGC levels constituting greater than 50% of those four compounds. Yutakamidori and Okumidori varieties picked in September contained the highest catechin values, at 43.6 mg% and 31.0 mg%, respectively. Fushun and Saemidori varieties contained lower catechin concentrations of 14.5 mg% (July) and 11.7 mg% (August) compared to other varieties. The EGCG levels gradually decreased in the late harvesting season, while levels of the other catechins, EC, EGC, and ECG, gradually increased. All varieties of green tea showed a gradual decrease in caffeine content toward the end of our harvesting efforts in October, with levels of 58~68 mg% in April and 28~57 mg% in October. Yabukita, Saemidori, and Okumidori varieties reached their highest caffeine levels in late spring/early summer, with Yabukita and Okumidori varieties reaching a high of 73.4% and 63.5% caffeine, respectively, in May, and Saemidori at 64.0% in June. In particular, Fushun still contained high caffeine of 66.8 mg% (September) during the late harvesting season.