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김도식(Do-Sik Kim),김형의(Hyoung-Eui Kim),윤성한(Sung-Han Yoon),강이석(E-Sok Kang) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.3
본 논문은 교정가속수명시험법을 이용하여 액슬구동축의 피로수명을 예측하는 법을 제안한다. 교정가속 수명시험법은 수명예측, 시험시간 절감, 신뢰성 정량화시에 매우 효과적이다. 피로시험은 두 개의 고 부하 수준과 한 개의 저 부하 수준에서 수행되고, 외삽법을 사용하여 사용수준에서의 수명시간을 예측하게 된다. 본 논문에서는 수행시험 결과로부터 획득한 수명시간, 가속지수, 형상모수, 척도모수등과 같은 주요 신뢰성 인자들을 보여주고 있다. 액슬구동축의 수명예측은 부하스펙트럼 데이터와 시험데이터와의 비교 연구를 수행하여 검증하였다. 교정가속수명시험법을 사용한 수명예측법은 짧은 시간내에 수명을 예측하는데 매우 효과적인 방법임을 확인하였다. In this paper, a method to predict the fatigue life of an axle drive shaft by the calibrated accelerated life test (CALT) method is proposed. The CALT method is very effective for predicting lifetimes, significantly reducing test time, and quantifying reliability. The fatigue test is performed by considering two high stress and one low stress levels, and the lifetime at the normal stress level is predicted by extrapolation. In addition, in this study, the major reliability parameters such as the lifetime, accelerated power index, shape parameter, and scale parameter are determined by conducting various experiments. The lifetime prediction of the axle drive shaft is verified by comparing the experimental results with load spectrum data. The results confirm that the CALT method is effective for lifetime prediction and requires a short test time.
고화질 VoD 서비스를 위한 멀티미디어 파일시스템 구현
김갑동(Kap-Dong Kim),석성우(Song-Woo Sok),박유현(Yu-Hyeon Park),이용주(Yong-Ju Lee),김창수(Chang-Soo Kim),김학영(Hag-Young Kim) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.1
고화질의 VoD 서비스를 위한 차세대 인터넷 서버는 디스크 컨트롤러, 네트워크 어댑터와 메모리를 하나의 하드웨어에 집적한 네트워크 스토리지 카드를 기본으로 리눅스 환경에서 개발되었다. 본 시스템에서 제공하는 입출력 경로를 리눅스에서 사용되고 있는 EXT3 파일시스템과 호환이 되도록 설계하고 구현하였다. 본 파일시스템은 기존의 EXT3 파일시스템의 기능을 그대로 사용하면서 대용량의 고화질 멀티미디어 데이터를 고속으로 처리하고, 시스템의 자원을 최소로 사용하면서 VoD 서비스에서 요구하는 데이터 입출력 처리 성능을 제공한다. 본 논문에서는 차세대 인터넷 서버 환경에서 개발된 멀티미디어 파일시스템의 설계, 구현 내용과 성능을 기술한다.
김석태(Sok-Tae Kim),이경수(Kyoung-Soo Lee) 한국무역연구원 2014 무역연구 Vol.10 No.2
The objective of this paper is to perform a case study on some of Korean firms which undertake overseas resources development and to set up a ground for effective risk management policies from firms and government s perspective. Risks associated with overseas resources development can be classified into three categories such as technical risk, financial risk and political risk. For in-depth case study, the most active top 10 firms are selected and closely surveyed The result shows that most of the firms studied maintain sort of technical risk management system, even mostly relying on outsourcing. As for the financial risk management, simple hedging method using forward contracts are implemented in most of the firms and no other systematic risk management systems are attempted. Only political risks are found to be monitored in a continuous manner. This study suggests some policy implications such as improving technical capability, establishing independent risk management system, and introducing well orchestrated government s efforts with related finns.
운동이상형 소화불량증을 호소하는 당뇨병 환자에서 주석산 시사프리드의 효과
김선명(Sun Myung Kim),추교영(Kyo Young Choo),최명규(Myung Gyu Choi),김진일(Jin Il Kim),방춘상(Choon Sang Bhang),한석원(Sok Won Han),김병욱(Byung Wook Kim),최황(Hwang Choi),김성수(Sung Soo Kim),이동수(Dong Soo Lee),최규용(Kyu Yong Ch 대한소화기기능성질환·운동학회 2001 Journal of Neurogastroenterology and Motility (JNM Vol.7 No.1
N/A evaluated the effects of cisapride tartrate on gastrointestinal symptoms and gastric emptying times in diabetic patients with dysmotility like dyspeptic symptoms. Methods: Cisapride was administered before each meal in 61 patients for 4 weeks. The intensity of gastrointestinal symptoms before and after cisapride administration was scored from 0 to 4, in the order of increasing severity of symptoms. In addition, a gastric emptying test was performed. Results: A significant reduction in the total intensity score of symptoms was observed during the first two weeks, from 8.5±2.1 to 4.0±3.0 (p<0.05), and a further reduction was noted during the next two weeks, to 2.8±2.8 (p<0.05). Good to excellent improvement was obtained in 70.4% of the patients, but the improvement in symptoms was not related to age, duration of diabetes, glucose, Hb A1c, neuropathy, or retinopathy. Treatment with cisapride induced a significant regression of symptoms and a significant improvement of delayed gastric emptying from 104.0± 31.7 minutes to 79.5±17.1 (p<0.05). However, there was a lack of association between the changes in gastric emptying times and improvements in symptoms(r2=0.00186). Only 3 patients complained of loose stool, nausea, or dizziness. Conclusions: Cisapride was effective in improving dysmotility like dyspeptic symptoms in diabetic patients without serious side effects. (Korean Journal of Gastrointestinal Motility 2001;7:56-64)
김석태(Kim Sok-Tae),김태인(Kim Tae-In) 조선대학교 지식경영연구원 2006 지역개발연구 Vol.11 No.2
The objective of this paper is to analyze the competitiveness of the Cargo Management improvement of FTZ(Free Trade Zone) in East Asia and to suggest several measures to improve it. To the end, various comparisons are made between the FTZ of Incehon and those in Hongkong, Taiwan, Shanghai. Competitive advantages of Incheon’s FTZ over others lie in its better contiguity, frequency, quality service, and convenient connections associated with the airport. To be viable, however, the Incheon’s FTZ needs to have strong supports from the central government such as more SOC investment, early introduction of RFID/UBIQUITOUS, improvement of customs process and logistics system, and competitive incentives to bring in more international channel hubs to this area. With these implemented promptly as suggested, the Incheon’s FTZ will draw its competitive advantages over those in Taiwan and Shanghai and will play an vital role to bring in more MNEs to Korea