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진미령,최용휴,이세휘,김규상 大韓産業醫學會 1998 대한직업환경의학회지 Vol.10 No.4
The objectives of this study were to investigate the prevalence and risk factors of occupationally related carpal tunnel syndrome(CTS) among workers employed in services and manufacturing industries analysing the sensitivity and specificity of clinical symptoms and signs. Three surveys were made for this study. The first survey was done for 1,447 workers employed by 25 companies. The jobs of the employees were repetitive works at VDT and assembly lines. Therefore, employees could be divided to two groups, doing repetitive works and non repetitive works. The second survey was made for 189 workers who were randomly selected from 517 workers complained some symptoms at their hands and wrists. We examined their symptoms and carried out neurological examinations for CTS(Tinel's sign, Phalen's sign, pin prick test, carpal compressive test, toniquet compression test). The third survey was made for nerve conduction study(NGS) for 57 workers who had shown positive signs for CTS. The main results of this study were as follow: 1. From the first survey, we have found that there were significant statistical differences in getting uncomfortable neuromuscular symptoms by sex, job type, total working hours during a week, duration of current work, and kinds of work. Odds ratio in male vs female, repetitive vs non repetitive, service vs manufacturing companies, total working hours during a week, and duration of current work were 1.867(95% CI=1.467-2.377), 1,680(95% CI=1.121-2.279), 1.663(95% CI=1.123-2.279), 1.016(95% CI=1.006-1.027) and 1.283(95% CI=1.097-1.501) respectively. 2. From the second survey, we have found that 46 peoples (25.0%) were positive for one or more than one signs in neurological examination of NIOSH criteria. Positive findings from neurological examinations were high among workers of low level of education(p-value=0.008), manufacturing jobs(p-value=0.00), long hours a week(p-value=0.028), and long duration of current work(p-value=0.00). 3. From the third survey, we diagnosed 35 peoples (61.4%) had CTS by NCS. They had abnormally delayed latent period or velocity in median nerve conduction velocity.
염미령,김성규 안양대학교 1999 논문집 Vol.18-19 No.-
월드 와이드 웹(WWW) 사용의 급증으로 인해 웹 프락시(proxy) 서버의 캐싱 능력은 그 중요성이 날로 증가하고 있다. 본 논문을 WWW에서 사용되는 캐슁 방법에 대해 살펴보고 캐슁의 필요성과 장 · 단점 그리고 성능 비교에 대해 언급한다. 또한 일관성을 유지하기 위해 사용된 생명주기를 표현하는 Time-To-Live, 문서의 내용이 바뀌면 리모트 서버가 알려주는 콜백 기법의 소개와 각각의 장 · 단점에 대해서도 설명한다. 웹 프락싱을 지원해주고 HTTP 헤더와 특정 오브젝트들의 캐슁 허가 방안과 프락시 캐슁을 위한 또 다른 방법으로, 응답 시간을 줄이고 항상 유효한 문서들을 유지하기 위해 주기적으로 캐쉬된 페이지들을 리프래쉬하는 선반입(pre fetching) 기법과 인기있는 문서들을 클라이언트가 요청하기 전에 미리 캐슁하는 복제 방법을 알아본다.
염미령,김병곤 부천대학 2001 論文集 Vol.22 No.-
웹의 이용률은 폭발적인 증가세에 있으며 대부분의 경제 활동도 웹으로 옮겨가고 있는 추세이다. 그러나, 웹 이용률의 증가에 따른 웹서버의 성능 향상이 뒤따르지 못하면 웹서버는 과적이 된다. 전자상거래에서 웹 서버 과적은 고객 이탈로 이어지므로, 웹 서버는 웹 사용자들을 만족시킬 수 있는 충분한 성능을 보여야 한다. 대규모의 가입자를 보유하고 있는 다수의 인터넷 기업들은 사용자의 증가에 따라 서버의 용량 증가에 많은 비용을 투자하고 있는 실정이며 사용자의 요구를 만족시키기 위해 끊임없이 용량을 늘여야만 하는 상황에 이르렀다. 가장 간단하게 서버의 과적 상태를 해결하는 방법으로는 하드웨어를 추가시키는 업그레이드로 해결 할 수 있다. 그러나 이 방법은 비용이 많이 든다. 본 논문에서는 저 비용의 소프트웨어적인 방법으로 웹 서버의 과적을 줄이고 성능을 향상시키는 방안들을 제시한다. As the number of Web users and the diversity of Web applications continues to explode, performance of web server is an increasingly critical issue in the domain of e-Commerce. To provide the flexibility needed to respond to customer requests, Web pages that support e-Commerce applications typically are dynamically computed. Inevitably, more requests are made of servers than they can immediately handle - the magnitude of user demand outstrips server capacity. The outcome of this situation is that often some users are denied access to the server, or the accessed service is unacceptably slow. The easy way to improve the performance of web server is upgrading and expanding the web server hardware, but this method needs high cost. In this paper, we propose software methods for decreasing the overload and improving the performance of web server.
SUBNORMAL WEIGHTED SHIFTS WHOSE MOMENT MEASURES HAVE POSITIVE MASS AT THE ORIGIN
MI RYEONG LEE,KYUNG MI KIM 한국산업응용수학회 2012 Journal of the Korean Society for Industrial and A Vol.16 No.4
In this note we examine the effects on subnormality of adding a new weight or changing some weights for a given subnormal weighted shift. We consider a subnormal weighted shift with a positive point mass at the origin by means of continuous functions. Finally, we introduce some methods for evaluating point mass at the origin about moment measures associated with weighted shifts.
Distributed Coordination Protocol for Ad Hoc Cognitive Radio Networks
Kim, Mi-Ryeong,Yoo, Sang-Jo The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.1
The exponential growth in wireless services has resulted in an overly crowded spectrum. The current state of spectrum allocation indicates that most usable frequencies have already been occupied. This makes one pessimistic about the feasibility of integrating emerging wireless services such as large-scale sensor networks into the existing communication infrastructure. Cognitive radio is an emerging dynamic spectrum access technology that can be used for flexibly and efficiently achieving open spectrum sharing. Cognitive radio is an intelligent wireless communication system that is aware of its radio environment and that is capable of adapting its operation to statistical variations of the radio frequency. In ad hoc cognitive radio networks, a common control channel (CCC) is usually used for supporting transmission coordination and spectrum-related information exchange. Determining a CCC in distributed networks is a challenging research issue because the spectrum availability at each ad hoc node is quite different and dynamic due to the interference between and coexistence of primary users. In this paper, we propose a novel CCC selection protocol that is implemented in a distributed way according to the appearance patterns of primary systems and connectivity among nodes. The proposed protocol minimizes the possibility of CCC disruption by primary user activities and maximizes node connectivity when the control channel is set up. It also facilitates adaptive recovery of the control channel when the primary user is detected on that channel.
Kim Jeong-Min,Kim Heui Man,Lee Eun Jung,Jo Hye Jun,Yoon Youngsil,Lee Nam-Joo,Son Junseock,Lee Ye-Ji,Kim Mi Seon,Lee Yong-Pyo,Chae Su-Jin,Park Kye Ryeong,Cho Seung-Rye,Park Sehee,Kim Su Jin,Wang Eunbye 질병관리본부 2020 Osong Public Health and Research Persptectives Vol.11 No.3
Objectives Coronavirus Disease-19 (COVID-19) is a respiratory infection characterized by the main symptoms of pneumonia and fever. It is caused by the novel coronavirus severe acute respiratory syndrome Coronavirus-2 (SARS-CoV-2), which is known to spread via respiratory droplets. We aimed to determine the rate and likelihood of SARS-CoV-2 transmission from COVID-19 patients through non-respiratory routes. Methods Serum, urine, and stool samples were collected from 74 hospitalized patients diagnosed with COVID-19 based on the detection of SARS-CoV-2 in respiratory samples. The SARS-CoV-2 RNA genome was extracted from each specimen and real-time reverse transcription polymerase chain reaction performed. CaCo-2 cells were inoculated with the specimens containing the SARS-COV-2 genome, and subcultured for virus isolation. After culturing, viral replication in the cell supernatant was assessed. Results Of the samples collected from 74 COVID-19 patients, SARS-CoV-2 was detected in 15 serum, urine, or stool samples. The virus detection rate in the serum, urine, and stool samples were 2.8% (9/323), 0.8% (2/247), and 10.1% (13/129), and the mean viral load was 1,210 ± 1,861, 79 ± 30, and 3,176 ± 7,208 copy/µL, respectively. However, the SARS-CoV-2 was not isolated by the culture method from the samples that tested positive for the SARS-CoV-2 gene. Conclusion While the virus remained detectable in the respiratory samples of COVID-19 patients for several days after hospitalization, its detection in the serum, urine, and stool samples was intermittent. Since the virus could not be isolated from the SARS-COV-2-positive samples, the risk of viral transmission via stool and urine is expected to be low.