공정성을 보장한 초기 윈도우 크기 조정을 통한 유무선 환경에서의 TCP 성능 개선

노인호,김영용 延世大學校 電波通信共同硏究所 2002 電波通信論文誌 Vol.6 No.1

TCP(Transmission Control Protocol)는 현재 인터넷 웹 서비스와 이메일 서비스 등에서 널리 사용되는 안정적인 프로토콜이다. 이러한 서비스들은 인터넷의 대부분을 차지하는 서비스이므로 TCP가 결국 인터넷의 대부분의 트래픽을 제어하고 있다. 그런데 이러한 서비스들은 대부분 작은 양의 데이터로 이루어져 있다. 다시 말하면 데이터를 전송하는 동안 TCP 연결이 되었을 때 모든 데이터가 다 전송되는 것은 TCP의 슬로우 스타트 기간동안 끝날 확률이 높다. 따라서 TCP는 사용할 수 있는 대역폭을 충분하게 사용하지 못하게 된다. 이러한 사실에 착안하여 우리는 TCP를 조금 수정하는 것을 제안한다. 이것은 데이터 전송량이 적고 RTT(Round Trip Time)가 긴 링크에서 효과가 좋다. 우리의 제안한 방법은 초기의 슬로우 스타트 구간에서 소비되는 시간을 줄이고 다른 사용자들의 트래픽에 성능에 저하를 주지 않으면서 공정하게 대역폭 사용을 최대화해 준다. 이러한 사실은 모의실험을 통하여 확인하였다. TCP(Transmission Control Protocol) is the prevalent reliable transport protocol used for the most popular Internet service link web browsing and e-mail. Since these services are the dominant applications on the Internet, TCP contorls the majority of today's Internet traffic. These services usually involve transmission of relatively small amount of data^[1]. In other words, when TCP connections are opened for the data transfer, there exists large probability that the whole transfer is completed while the TCP sender is still in the slow start phase. Therefore, the TCP connection never manages to fully utilize the available bandwidth. Motivated on this fact, we proposes a small change to TCP that may be beneficial to short-lived TCP connections and those over links with large RTT(Round Trip Time)s. Our proposed scheme can save serveral RTTs during the initial slow- start phase and maximize the wireless bandwidth utilization guaranteeing fairness without degradation of other traffics. Simulation shows significantly improved performance in TCP throughput.

공간구문론을 이용한 루이스 칸 건축의 공간구조 분석에 관한 연구

노재원,김영욱,이상호 대한건축학회 2003 대한건축학회논문집 Vol.19 No.5

This study is the quantitative analysis which doesn't only focus on Kahn's statement but also the architectural space itself. The purpose of this study is to understand Kahn's architecture with an actual proof with the use of Space Syntax. The results of this study were as follows; Firstly, in the spatial configuration like concentric circle centering around a huge space, the characteristics are, - forming the rank of syntactic value and determining building user's flow - clarifing building user's spatial cognition - representing Kahn's architectural concept from the beginning Secondly, in the spatial configuration with centrality by putting specific spatial unit to the universal spaces without especially integrated or segregated spaces, - spatial configuration would rather be settled by Kahn's architectural concept which has priority to building's function than satisfy the functional demand following building type. Thirdly, Kahn's void space doesn't mean empty space but his point of architectural concept ; 'Room'

직장암의 림프절 전이에 대한 고찰

노정호,김영진 대한대장항문학회 1994 Annals of Coloproctolgy Vol.10 No.1

펄스 강자장 발생 연구

이장로,이용호,신용돌,이영희 숙명여자대학교 자연과학연구소 1993 자연과학논문집 Vol.- No.4

고전압 대용량의 전해축전기에 축적된 전하를 다층 솔레노이드에 순간적으로 방전할 때 흐르는 대전류에 의하여 솔레노이드 내부에 순간적인 강자기장을 발생시켰다. 코일의 형상, 회수 및 축전기의 전기용량과 충전전압에 따르는 방전전류, 발생자장, 발생열량 등을 계산하였다. 제작된 장치는 300 V로 충전된 0.01 F의 축전기의 전하를 내경 14 mm, 길이 40 mm, 회수 217회의 솔레노이드에 방전하여 최대전류 750 A, 최대자장 4.52T, 반주기 8 ms의 결과를 얻었다. Pulsed high magnetic fields were generated by discharging a large capacitance charged with high voltage into air solenoid. The relations between intensity of discharged current, generated magnetic field intensity, thermal dissipation, capacitance, charged voltage and geometry of solenoid were obtained with computer simmulation. A small scale apparatus was built to get the data for regular scale device. The maximum field of 4.52T, maximum current of 750A and 8ms half period was obtained by discharging a 300V, 0.01F capacitance into a solenoid 14mm inner diameter, 40mm long and 217 turns.

體育高等學校 學生들의 運動種目別 體力 比較硏究

진연호,노영태 釜山大學校 附設 體育科學硏究所 1994 體育科學硏究所 論文集 Vol.10 No.-

The purpose if this study was to compare and analyze the physical fitness of the different sport groups in high school athletes. The subjects were 120 athletes in P high school of Physical education. The results of measurement on six factors and twelve items, the conclusions were as follows: 1. In the factor of strength, the best performed athlete groups were ju do, sprinter, and weight lifting, on the other hand, the worst were tae kwon do, long distance runner, and boxing. In the item of back strength, between the athlete groups of weight lifting and tea kwon do were shown a significant difference at the level of 5%. 2. In the factor of muscular endurance, the best performed athlete group was gymnastics, on the other hand, the worst was tae kwon do. In the item of pull-up, between the gymnastics group and the other group were significant difference at the level of 5%. 3. In the factor of power, while the best performed athlete groups were sprinter, weight lifting, and gymnastics, the worst were ju do, boxing, and archery. The athlete groups of between sprinter and weight lifting were shown a significant difference at the level of 5%. 4. In the factor of agility, the best performed athlete groups were sprinter and boxing, on the other hand, the worst were ju do, archery, and shooting. Between the athlete groups of sprinter and ju do were shown a significant difference at the level of 5%. 5. In the factor of flexibility, the best performed athlete groups were gymnastics and shooting, on the other hand, the worst were boxing and archery. And there was a significant difference between gymnastics and other athlete group at the level of 5%. 6. In the factor of balancer, while the best performed athlete group was gymnastics, the worst were ju do. But, among the athlete groups, a significant difference was not shown.

펄스전자석에 의한 자기이력곡선측정기

이용호,신용돌,이영희,이장로 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.16 No.-

보자력이 큰 강자성체의 자기이력곡선, 자기변형, 자기이방성등의 측정에 사용할수 있는 펄스전자석을 설계제작하였다. 철심의 형상이 주어졌을때 권선의 회수에 다른 전사석의 여러특성과 축전기 방전시의 전류진폭 감쇄비등을 계산하는 일반식을 유도하고 그것에 의하여 철심단면적 46 mm × 32 mm, 공기간격 28 mm의 전자석을 설계 제작하여 20 mT/A의 기울기로 0.49 T 까지 직선적인 자기장대 전류특성을 얻었다. 이 전자서에 애너로그 적분기에 의한 자속계를 부쳐서 박막 또는 박대시료의 major 및 minor 이력곡선을 단번에 쉽게 얻을 수 있는 자기이력곡선 측정기가 구성되었다. A pulsed electromagnet with silicon steel core driven by alternating current or oscillatory decaying current using capacitor discharging method for measuring magnetic hysteresis loops, magnetostriction and magnetic anisotropy of high coercivty magnetic sample is built The general formuli for various chariteristics of the electromagnet with given geometry of iron core and turns of copper wire are presented. Using these formuli, an electromagnet with 46 mm × 32 mm of core's cross section and 28 mm of air-gap is designed and built, its magnetic field to current ratio of 20 mT/A is linear up to 0.49 T. Combining this electromagnet with an analog integrated fluxmeter, a magnetic hysteresis loop can be easily displayed major and minor loops of thin film or strip at once.

특수 체육의 이해와 발전 방향에 관한 연구

전동호,노영태 釜山大學校 附設 體育科學硏究所 1997 體育科學硏究所 論文集 Vol.12 No.-

The equal opportunity of education is one of the basic rights of democracy. That means the handicapped also have the same rights as the physical education, physical programs for the handicapped, including adaptde physical education, Developmental physical education and corrective physical education, helps the disabled to live ordinary lives mentally and socially as well as physical education plays roles such as the promotion of health and social and intellectul development, treatment, the preservation of mental and emotional stability and adaptation, etc. In addition, being a counselor is one of the things required of a special physical teacher. Finally we should stop our attitude of prejudice toward the handicapped and help them to be equal members of our sociaty.

상아질에 대한 자가 산부식 접착제의 전단결합강도와 SEM 분석 비교

조영곤,노기선,김수미,이영곤,정진호,기영재 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.3

The purpose of this study was to compare shear bond strength and interfacial pattern of composite bonded to dentin using self-etching adhesive systems. Sixty extracted human molars with exposed occlusal dentin were divided into four groups and bonded with four adhesives and composites: Single Bond/Filtek Z 250(SB), Tyrian SPE-One-Step Plus/Aelitefil(TY), Prompt L-Lpop/Filtek Z 250(LP), and one-Up Bond F/Palfique Toughwell(OU). The results of this study were as follows; 1. Shear bond strength for OU was significantly lowet than that of other groups(p<0.05). No significant difference was founded among SB, TY, and LP. 2. Failure modes to dentin showed adhesive and mixed for SB, TY, and LP, but them for OUT showed adhesive in all spceimens. 3. Dentin-resin interface showed close adaptation for SB, TY, and LP, but it showed gap for OU. 4. The hybrid layers for TY, LP, OU were thinner than that of SB. Adhesive layers were observed between composite and hybrid layer, which were 5 ㎛ thick for TY and 10 ㎛ thick for OU.

펄스전자석에 의한 자기이력곡선측정기

이장로,이용호,신용돌,이영희 숙명여자대학교 자연과학연구소 1993 자연과학논문집 Vol.- No.4

보자력이 큰 강자성체의 자기이력곡선, 자기변형, 자기이방성등의 측정에 사용할 수 있는 펄스전자석을 설계제작하였다. 철심의 형상이 주어졌을 때 권선의 회수에 따른 전자석의 여러특성과 축전기 방전시의 전류진폭 감쇄비등을 계산하는 일반식을 유도하고 그것에 의하여 철심단면적 46mm×32mm, 공기간격 28mm의 전자석을 설계 제작하여 20mT/A의 기울기로 0.49T까지 직선적인 자기장대 전류특성을 얻었다. 이 전자석에 애너로그 적분기에 의한 자속계를 부쳐서 박막 또는 박대시료의 major 및 minor 이력곡선을 단번에 쉽게 얻을 수 있는 자기이력곡선 측정기가 구성되었다. A pulsed electromagnet with silicon steel core driven by alternating current or oscillatory decaying current using capacitor discharging method for measuring magnetic hysteresis loops, magnetostriction and magnetic anisotropy of high coercivity magnetic sample is built. The general formuli for various characteristics of the electromagnet with given geometry of iron core and turns of copper wire are presented. Using these formuli, an electromagnet with 46mm×32mm of core's cross section and 28mm of air-gap is designed and built, its magnetic field to current ratio of 20mT/A is linear up to 0.49T. Combining this electromagnet with an analog integrated fluxmeter, a magnetic hysteresis loop can be easily displayed major and minor loops of thin film or strip at once.

생산전략에 의한 기업성과에 관한 실증적 연구

이성호,오영진,박노국 尙志大學校 生産技術硏究所 1997 生産技術論叢 Vol.- No.1

The growth and survival of a business depend upon its proper strategic capability against the rapid change in environment. The business that well accommodates the changing environment and properly uses the resources will continue its growth. The problems in accommodating business environment are how to focus the limited corporate strategy on certain point. This study analyzed the performance of corporate and lower level functional strategy to produce the competitiveness of manufacturing company and to recommend the corporate strategic directions from the results. Consequently, business competitiveness depends upon how a business consistently precedes the alternatives of corporate strategy and the focused factory strategy. Therefore, top management should pay attention to the focused factory in product manufacture.