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허선(Hur, Sun),신동민(Shin, Dong Min),남진규(Nam, Jin gyu),이현(Lee, Hyun),김현우(Kim, Hyun Woo) 인하대학교 정석물류통상연구원 2008 인하대학교 정석물류통상연구원 연구총서 Vol.- No.-
Ubiquitous means integration of different networks and under which all operations should be processed in real time and prediction of data generation is not available. In ubiquitous environments, the types of information are vast and their forms are complex. Collection of these data may cause queuing situation and it affects system performances. In addition, most data generated in ubiquitous environments have time constraints, by which they become obsolete as time elapses. Therefore, it is essential to establish systems which accommodate the time constraints as the systems become more complicated. In this paper, we consider the characteristics of information in ubiquitous environments and build an analytical model to provide system performance measures which are required to compose and plan a system. We build a time constrained information processing model which deals with more than one types of information. We also analyze parameters which decide information processing time as one of the system measures and provide a method which satisfies the required level of it. Several numerical computations are given to illustrate the extent of effect that the parameters have on the system.
무선 환경 하에서 Slotted ALOHA 방식의 다중채널 경쟁에 대한 지연시간분석
허선(Sun Hur),김정기(Jeong-Kee Kim),남진규(Jin-Gyu Nam) 한국산업경영시스템학회 2005 한국산업경영시스템학회지 Vol.28 No.1
Slotted ALOHA(S-ALOHA) is widely used in local wireless network. We analyze the performance of contention-based model in wireless LAN using S-ALOHA protocol. We analyze the performance of binary exponential backoff (BEB) algorithm under the slotted ALOHA protocol : whenever a node's message which tries to reserve a channel is involved in a collision for the ith time, it chooses one of the next 2^i frames with equal probability and attempts the reservation again. We derive the expected access delay and throughput which is defined as the expected number of messages that reserve a channel in a frame. A simulation study is performed to verify our method.
운동형태가 유방암 환자의 유방암 발병위험인자 및 종양 표지자에 미치는 영향
허선(Hur, Sun),장재훈(Jang, Jae-Hoon) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.3
The link between tumor marker CA15-3 and exercise needs to be continued, but domestic research is still small. Therefore, this research was intended to analyze the effects on breast cancer risk factors (E₂, IGF-1, IGFBP-3) and tumor marker (CA15-3) by conducting aerobic and resistance movements for 10 weeks, and to present a form of exercise that is useful for preventing breast cancer and preventing recurrence. Among women aged 30 to 60 years old, those who were not exercising regularly were those who did not have any acute or chronic oncological pain that could affect their studies, within six months or more of the time of the end of the post-surgical radiation therapy. These aerobic exercise group of 15 resistance exercise group, 15, 15 separate and entirely random control group. The exercises were divided into aerobic and resistance exercises, and the same exercise intensity (50~70%HRR) was set up three times a week and the exercise time was 70 minutes a week for 10 weeks. As a result of this study, E2, IGF-1 and IGFBP-3 had interaction effects of group and timing. E₂ and IGFBP-3 were significantly lower than comparison groups in the aerobic and resistance movement groups after exercise compared to before. IGF-1 was significantly lower in resistance after exercise than before than in aerobic exercise groups and comparison groups. CA15-3 had interaction effects of group and timing. It was significantly lower than the comparison groups in the aerobic and resistance movement groups after the exercise compared to before. The results of this study showed positive improvement in estradiol, IGFBP-3 and CA15-3 by regularly conducting aerobic and resistance movements. IGF-1 showed that the resistance movement was more effective than aerobic exercise.
반도체 클러스터 장비에서 웨이퍼 이동지연을 허용하는 스케줄링 방법
허선(Sun Hur),이현(Hyun Lee),박유진(You-Jin Park),양선호(Sun-Ho Yang) 한국생산관리학회 2011 한국생산관리학회지 Vol.22 No.4
차세대 반도체 생산을 위한 450㎜ 웨이퍼 제조공정의 가장 큰 특징은 모든 제조공정이 완전자동화로 이루어진다는 것이다. 이러한 완전자동화로 인해 작업자의 공정개입이 불가능하게 되고 개별 웨이퍼의 중요도가 증가하므로 완전자동화를 지원할 수 있는 보다 우수한 스케줄링 방법과 시스템이 요구된다. 즉, 450㎜ 웨이퍼 생산을 위한 스케줄링 시스템은 개별 웨이퍼와 클러스터 장비의 공정 상태를 실시간으로 반영하여 생산성을 향상시킬 수 있는 견고한 스케줄링 기법을 적용해야 한다. 본 연구에서는 450㎜ 웨이퍼 생산환경에서 중요하게 사용되는 클러스터 장비와 그 특성들을 소개하고 timetabling 방법에 기반을 둔 효과적인 실시간 스케줄링 기법을 제시하고자 한다. 특히 웨이퍼가 공정완료 이후 chamber에서 일정한 시간동안 대기할 수 있는 웨이퍼 이동지연을 고려하여 FOUP 단위의 사이클 타임(cycle time)과 개별 웨이퍼의 공정 시작시간을 결정할 수 있는 방법을 제시한다. In the next generation fab environment for 450㎜ wafer production, one of the most significant features is the adoption of full automation to the whole manufacturing processes involved. So, it is necessary to construct more robust scheduling system for the entire semiconductor manufacturing processes since the full automation system prevents the process engineers from intervening the manufacturing processes as much as possible and the importance of each individual wafer noticeably increases. The scheduling system for 450㎜ wafer production also should be capable of monitoring the status of each individual wafer and collecting useful fab data in real time. In this study, we first introduce the cluster tool mainly used in 450㎜ wafer production, and then propose an effective real-time scheduling algorithm based on the timetabling method. Especially, our method considers the case that the wafer is assumed to be able to stay at the current chamber prior to proceed to the next chamber for a while, which increases the flexibility to assign the starting times of the processes.
12주간 유산소 운동이 중년여성의 대사증후군 위험인자와 C-반응성단백질 및 호모시스테인에 미치는 영향
허선(Hur, Sun) 대한운동학회 2013 아시아 운동학 학술지 Vol.15 No.2
[서론] 이 연구는 대사증후군을 지닌 중년여성을 대상으로 유산소 운동을 실시하였을 때 신체구성, 대사증후군 위험인자, CRP 및 호모시스테인에 미치는 영향을 알아보고자 하였다. [방법] K시에 거주하는 중년여성 중 대사증후군 기준을 근거로 선별한 24명을 무작위로 운동집단 12명과 비교집단 12명으로 분류하였다. 12주간 유산소 운동프로그램은 최대심 박수의 60-70% 운동 강도로 러닝머신 위에서 걷기 및 달리기를 50분 동안 주 3회 실시하였다. [결과] 12주간의 유산소 운동은 신체구성, 대사증후군 위험인자, CRP 및 호모시스테인 농도에 긍정적인 영향을 보였고 대사증후군의 위험인자 수도 감소하였다. 유산소 운동 후 호모시스테인 변화량은 인슐린 변화량과 높은 정적 상관관계를 보였으며, CRP 변화량은 체질량지수, 총콜레스테롤, 저밀도지단백콜레스테롤 변화량과 높은 정적 상관관계를 보였다. 특히, 인슐린 변화량은 호모시스테인 변화량에, 체질량지수 변화량은 CRP 변화량에 높은 영향력을 미치는 것으로 나타났다. [결론] 본 연구에서 실시한 유산소 운동은 에너지 소비 증가, 지방사용 증가를 통해 체중감소와 지방분해를 일으켜 대사증후군을 지닌 중년여성의 대사증후군 위험인자와 CRP 농도 및 호모시스테인 수준을 감소시키고 대사증후군을 개선하는데 효과적인 영향을 미친 것으로 생각된다. [INTRODUCTION] The purpose of this study was designed to determine the effect of 12 weeks aerobic exercise training on metabolic syndrome risk factors, C-reactive protein and homocysteine in middle-aged women. [METHOD] Twenty-four middle-aged women with metabolic syndrome volunteered in this study. The subjects of each middle-aged women with metabolic syndrome were randomly divided into exercise group (n=12) and control group (n=12). Exercise group participated in the aerobic exercise training program for 12 weeks (3 days a week) consisting of aerobic exercise (60-70% HRmax, 50 minutes a day). [RESULT] After 12 weeks of exercise training, body weight, BMI, percent of body fat, waist circumference, TC, TG, LDL-C, diastolic blood pressure, fasting insulin, fasting glucose, HOMA-IR, CRP and homocysteine levels were significantly decreased in exercise group. HDL-C was significantly increased and metabolic syndrome risk factor number were significantly decreased after exercise training in exercise group. Also, △homocysteine was a significant positive correlation with △insulin. △ CRP levels was a significant positive correlation with △BMI, △TC, △LDL-C. In terms of the correlation between △insulin was positive correlation with △homocysteine with 42.1 percent of influence. △BMI also showed positive correlation with △CRP with 73.2 percent of influence. [CONCLUSION] These findings indicate that the aerobic exercise program was effective to prevent metabolic syndrome risk factors, CRP and homocysteine levels and the prevention of metabolic syndrome.