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OFDMA 시스템 상향링크의 레인징 부호 검출 성능 향상 기법
김기남,김진호,조성준,Kim Ki-Nam,Kim Jin-Ho,Cho Sung-Joon 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.6A
Orthogonal Frequency Division Multiple Access(OFDMA) 시스템에서 사용자는 초기 레인징 과정을 통해서 상향링크의 시간 동기를 획득한다. 기지국 수신기는 특정 사용자의 심볼에 시간 동기화하고 나머지 사용자들의 심볼들은 동기화된 시간과의 오차만큼 Symbol Timing Offset(STO)이 존재한다. 각 사용자의 STO에 의해서 한 OFDMA 심볼 내에 선형적인 위상 성분이 발생하고, 이 위상 성분들이 합성되어 다중 접속 간섭(Multiple Access Interference : MAI)으로 작용한다. 이런 MAI는 기지국 수신기의 레인징 부호 검출 성능을 열화 시키는 원인이 된다. 본 논문에서는 각 사용자의 STO에 의해 발생하는 위상 성분의 추정 및 보상을 위한 공통 레인징 부호를 사용하는 초기 레인징 심볼 구조를 제안한다. 공통 레인징 부호를 사용해서 각 사용자의 STO에 의해 발생한 위상 성분의 평균을 추정하고 보상한다. 이 방식은 MAI의 영향을 억제하여 기존 방식보다 더 향상된 레인징 부호 검출 성능을 제공한다. In Orthogonal Frequency Division Multiple Access (OFDMA) systems, timing synchronization in uplink is accomplished by an initial uplink synchronization called an initial ranging process. The Base Station's receiver synchronizes the symbol timing to specific user's symbol and the other user's symbols have some Symbol Timing Offset (STO). Linear phase shift is occurred by each user's STO in an OFDMA symbol. The Multiple Access Interference (MAI) caused by the summation of each user's linear phase shift degrades the performance of ranging code detection. In this paper, we propose an initial ranging symbol structure with common ranging code for phase shift estimation and compensation. We car estimate the average of phase shift that is generated by each user's STO and compensate this phase shift by using common ranging code. This scheme will suppress the MAI and provide better detection performance than conventional process.
김기남(Ki Nam Kim),백영아(Young Ah Baek),조진숙(Jin Suk Cho) 충북대학교 생활과학연구소 2009 생활과학연구논총 Vol.13 No.1
A survey was carried out to investigate relationship between stress level and dietary behavior of university students, in order to obtain baseline data for the development of an education program. Subjects included 214 male and female students who attended Chungbuk National University. The gender distribution of subjects was 43.0% males and 57.0% females, and BMI showed 16.8% overweight and 9.4% obesity. For the 26 items of stress test, stress scores were highest in the order of body images(2.37), future career(2.29) and the same gender friend(2.20) out of 4.0 in females, and academic problem(2.30), future career(2.21) and economic problem(2.20) in males. For dietary behaviors, skipping breakfast(48.1%) and 'eating too much in the evening' were the main problems of them. In the relation between stress and dietary behavior, higher stress level influenced negatively on dietary behavior significantly : especially each stress due to future career, body image, academic or economic problem influenced on the degree of concern about high caloric food consumption and regret for eating too much. In conclusion, an education program should be developed and offered for each high stress group, in order to improve dietary behavior for university students.
IP 네트워크를 기반으로 하는 스토리지 네트 워크 통합 관리 시스템 설계 및 구현
김기남 ( Ki-nam Kim ),허민영 ( Min Young Heo ),김진환 ( Jinhwan Kim ),송용호 ( Yong Ho Song ) 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.1
대용량 데이터의 효율적인 저장 및 접근을 위해 전용 네트워크를 이용한 스토리지 시스템의 사용이 증가하고 있다. 일반적으로 스토리지 네트워크는 IP 네트워크와 연동하여 운영된다. 하지만 두 네트워크 관리 방식의 차이로 인해 통합 관리에 어려움이 있다. 본 논문에서는 관리의 일관성과 효율성을 향상시키기 위해 SNMP 기반 IP 네트워크 관리시스템과 WBEM 기반 SAN 네트워크 관리시스템을 연결하는 SNMP-WBEM 게이트웨이를 제안한다. 제안된 게이트웨이 시스템은 IP 네트워크를 기반으로 SAN 네트워크 시스템에 대한 통합관리를 가능하게 함으로써 네트워크 관리의 효율성을 증대시킬 뿐 아니라, 네트워크 관리 시스템의 통합에 따른 문제점을 분석하고 이에 대한 해결책을 제시한다.
김기남(Ki Nam Kim),이영주(Yung Ju Lee),이지연(Jee Yun Lee),조진숙(Jin Suk Cho) 충북대학교 생활과학연구소 2006 생활과학연구논총 Vol.10 No.1
The purposes of this study were to analyze the characteristics of health & functional food advertisements in woman"s magazines, and to collect some basic data of nutrition education for consumers. The samples were 76 food advertisements among three famous woman"s magazines. Results were as follows : in health claims, the frequency of "diet" related advertisement was the most frequent(23.0%), in advertising method, distribution of "free of charge" was most frequent(25.0%), in the classification according to the standard of false and/or exaggerative advertisement, Woman Chosun was most frequent by 51.8% and in the messages that was exposed most frequently, "emphasis on the product"s superiority without scientific proof" was most frequent(26.0%). In the product type, tablet was most frequent(32.9%), in the manufacture country, Korea was most frequent(76.3%), but Korean marking on the packages among the languages was 22.4%. In the components of the product, nutrition components were more mentioned(194 times) than non-nutrition components(132 times), but lots of component"s names were very special and hard to understand. In conclusion, tighter supervision of food advertisements and nutrition education is required to protect the consumers from false and exaggerative advertisements.
김기남(Kim Ki-Nam),김은경(Kim Eun-Kyung),신은화(Sin Eun-Wha) 충북대학교 생활과학연구소 2004 생활과학연구논총 Vol.8 No.1
Food advertising influences consumer"s food choices, and it likely has either positive of negative effects on food choices. Therefore, supervision and monitoring toward food advertising is needed to protect the consumers from selecting inadequate foods. This investigation analysed the messages delivered in food advertisements broadcast by Korean three TV channels(KBS1, KBS2 and SBS). Advertisements broadcast during one week of August 2002 were recorded and the messages in each adv were coded for content analysis. The messages appeared in food adv were categorized into two areas(nutrition or non nutrition area), and each area was divided into several sub-groups. Every message in food adv was counted, and the data counted were calculated as frequency(%). The results obtained from this study were as follows. Total messages counted were 254, and nutrition related information was less than non-nutrition information. Non-nutrition related messages(77.5%) were three fold higher than nutrition related messages(22.5%). The messages most often used to promote the sale of a product referred to interest(15.9%), followed by taste(13.9%), mood(6.5%) and company image(6.5%) in non-nutrition information. The products that most frequently used non-nutrition related messages were drink products, milk & milk products and fast foods. Nutrition related information most frequently mentioned were "containing special ingredients"(7.4%), health(5.7%) and "containing special nutrients"(4.1%). The products that did not contain at least one nutrition message were fish product, ice cream, retort foods, vegetable oils, and fast foods. In conclusion, nutrition education to protect consumers should be required, and continuous supervision and monitoring should be needed.
계피식이가 고지혈증 유도 흰쥐의 지질대사 및 혈소판 응집에 미치는 영향
김기남(Ki Nam Kim),박양순(Yang Soon Park),장나리(Na Ri Chang),전진영(Jin Young Cheon),강은경(Eun Kyoung Kang) 충북대학교 생활과학연구소 2007 생활과학연구논총 Vol.11 No.2
The purpose of the present study was to investigate effect of dietary cinnamon on serum lipids and platelet aggregation in hyper-cholesterolemic rats. Sprague-Dawley rats were fed with hyper-lipidemic diet for 4 weeks in order to induce hyper-lipidemia, followed by feeding experimental diets for additional 4 weeks. Cinnamon in experimental diets was prepared by drying and milling. Cinnamon powder was added to experimental diets at the level of 2% and 5%. ALT and AST was significantly decreased in both cinnamon 2% and cinnamon 5% groups compared to control group. HDL-cholesterol was increased significantly while LDL-cholesterol was significantly decreased in both cinnamon 2% and 5% groups. Platelet aggregation was decreased significantly in cinnamon 5% group. The present observation indicates that cinnamon might be helpful for the prevention and treatment of hyper-lipidemia and platelet aggregation.
고 콜레스테롤 식이를 먹인 흰쥐에 있어서 솔잎의 급여가 체내 콜레스테롤과 중성지방 수준 및 혈소판 응집에 미치는 영향
김기남(Ki Nam Kim),전지혜(Jee He Jeon),허소정(So Jong Heo),강은경(Eun kyoung Kang) 충북대학교 생활과학연구소 2007 생활과학연구논총 Vol.11 No.2
This study was conducted to investigate hypo-cholesterolemic effect of dietary pine in rats fed cholesterol supplemented diets. Sprague-Dawley rats were fed with hyperlipidemic diet for 4 weeks in order to induce hyperlipidemia, followed by the feeding of experimental diets for additional 4 weeks. Pine of experimental diets was prepared by drying and milling. Pine powder was added to experimental diets at the level of 5% and 10%. Serum total cholesterol was significantly decreased in pine 5% group compared to control or pine 10% groups. Serum triglycerides was significantly decreased in pine 10% group. Platelet aggregation was significantly decreased by pine 5% and 10% supplementation. In conclusion, dietary pine might be helpful for the prevention and treatment of hyper-lipidemia and platelet aggregation.