• 대한전자공학회논문지TC
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• 제45권10호
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• pp.10-16
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• 2008

보통 저궤도를 선회하는 위성은 자기장으로 연결된 반알렌대를 통과하며, 이 안에 갇혀 주기적인 운동으로 남극과 북극을 이동하는 하전입자에 의해 부품이 손상되고 수명이 단축되는 악 영향을 받고 있다. 그중 방사선에 의한 SEU (Single Event Upset) 등은 우주선에 탑재된 반도체 소자의 오동작 유발의 원인이 되고 있다. 본 연구에서는 우주환경 방사선에서 고려해야 할 점들 중에서 특히 과학기술위성 1호 탑재 컴퓨터(On-board Computer, OBC)에서의 싱글이벤트업셋(Single Event Upset, SEU)의 영향을 고찰해 보고 거기에서 극복할 수 있는 알고리즘을 제시하고 있다. SEU 누적을 방지하기 위하여 매 일정한 시간마다 전체 메모리를 읽고/쓰는 과정(memory wash)이 필요하며 워쉬 주기 선정에 대해서도 고찰했다. 이러한 실험은 과학기술위성 시리즈 및 저궤도 위성용 탑재 컴퓨터의 성능 저하를 이해하는데 도움을 줄 수 있을 뿐만 아니라, 다목적 실용위성 시리즈의 각 모듈 개발에도 적극 활용 할 수 있을 것으로 기대된다.

• 한국항공우주학회지
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• 제32권1호
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• pp.98-105
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• 2004

• Journal of Ginseng Research
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• 제31권1호
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• pp.34-43
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• 2007

Background: Previous research has suggested that single doses of a standardised Panax ginseng extract can decrease fasted blood-glucose levels and modulate cognitive performance in healthy young volunteers. The latter has generally been seen in terms of improved secondary memory performance. However, both the cognitive effects of chronic administration of ginseng and the potential modulation of working memory have received comparatively little research attention. Aims: The current double-blind, placebo-controlled, balanced cross-over study investigated the effects of 8-weeks administration of Korean ginseng extract (200 mg) on cognitive performance, gluco-regulatory parameters and ratings of subjective mood and 'quality of life'. Methods: 'Eighteen healthy young participants were assessed pre-dose and 3 hours post-dose on the mornings of Day 1, Day 29 and Day 57 of 8 week treatment regimens of both placebo and ginseng. A four-week placebo wash-out separated the treatment phases. Each assessment included the Cognitive Drug Research battery, computerised working memory tasks, and Bond-Lader mood scales. The WHO Quality of Life scale (WHOQOL-BREF) was completed once per visit. Gluco-regulatory parameters were assessed with assays of blood glucose, insulin and HbA1c. Results: Data from the 16 participants that completed the study showed that there were no significant, acute treatment related differences on Day 1 of treatment, or in gluco-regulatory parameters throughout the study. However, time related performance improvements were evident following chronic administration of ginseng on the '3-Back' and 'Corsi-block' computerised working memory tasks. Ginseng was also associated with an improved score on the 'social relations' subscale of the WHOQOL-100, and a significant shift on the 'calm' factor of the Bond-Lader mood scales (from calm/relaxed towards excited/tense). Conclusion: The results of the current study suggest that Korean ginseng extract can modulate working memory performance and subjective ratings of 'quality of life' and mood. Replication with a larger sample size may further elucidate the actions of this product.

• 비교문화연구
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• 제33권
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• pp.53-75
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• 2013

It is well-known that Chinese saw themselves as the centre of the world until the early 20th century. Since the Opium War 1840, however, belong to the 'general world' the past century. The Opium War made China break away from the Sinocentric spirit. This writing(essay) examines movies from China and the World concern the historical event 'the Opium War.' It also discusses desires that are inherent in narration of each movie and how accord with the real world. The movie The Opium War(1997) directed by XieJin is a work that intended: to wash off the memory of history of disgrace and; to successfully put a disparate piece, Hong Kong, of a puzzle named China together. The Japanese movie Wànshìliúfāng(1943)and The Opium War(1943) were also made for the victory of the Pacific War. They were part of project for uniting the domestic Japan and the colonial outlands - Manchuria and Joseon - that reenacted humiliating history of China, which had been the suzerain of the East Asia The Korean movie The Opium War(1964) was not recalled due to the demand for a lesson from China's painful history, but was recreated by imitating Hong Kong, into where capitalism was transplanted through the Opium War before Korea. History is eventually recalled to the present and the histories, that each different present invokes, are recreated in respective fashion. From their plan to wash off the history of disgrace and successfully return Hong Kong to its native country, China, Japan, and Korea portrayed China, once their cultural suzerain, as impotent East Asia. From their proposition that they should resist the present enemy, the West, together, they imitated the west of the East, which lead the way to achieve modernity. Finally, from their ambition to deviate from their status as developing country, they recalled and reorganized the history, the Opium War.

• Journal of Acupuncture Research
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• 제28권2호
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• pp.107-116
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• 2011

Objectives : This study was performed to investigate the effects of fixed-intensity and varied-intensity electroacupuncture on heart rate variability in healthy people with stress task. Methods : Forty healthy subjects were randomly assigned to either group A or group B or C. Group A received fixed-intensity electroacupuncture(F-EA) at $ST_{36}$ and $ST_{37}$. After 1 week wash out period to prevent overlapping residual effects, they received varied-intensity electroacupuncture(V-EA) in which the intensity was changed every two minutes based on individual heart rate variability at the same points. Group B received the treatments in reverse order. Group C received no intervention as a control group. Results : Control group showed a significant increase of LF and LF/HF during the 2nd working memory task, while both F-EA and V-EA did not. In addition, V-EA showed a significant increase of HF during 2nd rest while F-EA did not. Conclusions : These results suggest that F-EA and V-EA can inhibit sympathetic activation more than control group and that V-EA can enhance parasympathetic activation more than F-EA.