[논문]Operational Characteristics of CO2 Laser Adopted by Superposing-Discharge

Hee-Je Kim,Hyun-Ju Chung,Byoung-Dae Min,Jong-Han Joung,Sung- lun Park 釜山大學校生産技術硏究所 2003 生産技術硏究所論文集 Vol.62 No.-

오늘날 현저한 CO2 레이저의 응용 추세에 발맞추어 보다 다양한 형태의 출력 제어 기술이 대두되고 있다. 본연구에서는multi-Pulse Superposing-Discharge 기술을 이용하여 다양한형태의 CO2 레이저의 펄스를 성형 하였다. 펄스 성형을 위한 방법으로 PIC one-chip microprocessor를 이용하여 삼중 PFN 모률의 SCR을 각각 고유의 지연시간을 가지도록 제어하였다. 실험에 사용된 삼중 PFN 모률의 전원 회로는 각각 캐패시터 인덕터,SCR,고압 펄스 트랜스 그리고 고압 트랜스 2차측에 브릿지 정류기로 구성 하였다. 고압 펼스 트랜스의 1차측을 제어하므로서 PFN 모률의 동작을 저 전압에서 수행 할 수 있다. 트랜스의 2차측에 연결된 전파 정류기는 펄스 에너지를 부하에 지속적으로 전달한다. 본 연구에서는 삼중 PFN 모률의 각각의 SCR을 다른 시간 가격을 두고 트리거 하므로서 다양한 Long pulse shaping을 실현하였다. 또한 약 250-1000μs 의 주기를 가지는 다양한 펄스형 레이저 빔을 얻었다.

만성 심부전환자의 혈액에서 측정한 Tumor necrosis factor-α 및 Interleukin-6의 임상적 의의

김명구,김성구,박상호,한대희,강진환,변정득,심규혁,최병조,방덕원,온영근,현민수,권영주 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background and objectives: Many conditions are responsible for the pathophysiology and progressive mechanisms of congestive heart failure. More recently, it has also become evidence that another class of biologycally activated molecules generically reffered to as cytokine these are also over expressed in congestive heart failure. Therefore, the purpose of this study was to measure concentrations of tumor necrosis factor-α(TNF-α), interleukin-6(IL-6) in mild to severe symptoms of heart failure and compare their values with those found in normal control and analysed correlation relationship between cytokine level, clinical findings and hemodynamic indicies. Subjects and Methodology: Levels of TNF-α and IL-6 were measured on pulmonary artery during cardiac catheterization in heart failure patients(n=32) and normal subjects(n=8) as well as physical examination and echocardiogram. Cytokines assay were performed on plasma using commercially available ELISA(Enazyme-Linked Immunosorbent Assay) kits. Results: Although the levels of TNF-α and IL-6 tend to increase in congestive heart failure group, the cytokines level was not made significantly statistical difference between congestive heart failure group and controls. When analyzing the correlation between the levels of PCWP(pulmonary capillary wedge pressure) and cytokines(TNF-α, IL-6), respectively, there were statistically significant correlation coefficient 0.32,(p<0.05), 0.39(p<0.01). The cytokine IL-6 and pressure of pulmonary artery were significant correlation.(correlation coefficient 0.36, p<0.02) More significantly, there was correlated with TNF-α and IL-6.(correlation coefficient 0.57, p<0.001) Conclusions: There was tended toward high concentration of TNF-α & IL-6 in congestive heart failure and significant difference for PCWP between TNF-α & IL-6, thus may be correlated with development and progression in congestive heart failure.

항공기 사고, 생존 그리고 구조

김대중,박병옥 공군본부 의무감실 1992 항공의학 Vol.40 No.1-2

Narrow Band UVB로 치료한 진행성 반상 저색소증 1예

김병대,정예리,이근수,한승경 대한피부과학회 2003 대한피부과학회지 Vol.41 No.12

Progressive macular hypomelanosis is an idiopathic acquired hypopigmentary disorder first descri-bad in 1988. The disorder is characterized by ill-defined, non-scaly, round to oval, hypopigmented patches symmetrically localized on the trunk. No clinical symptoms have been observed. Currently, diagnosis is made on clinical grounds and any histological, laboratory investigations are not diagenositc. This disorder does not respond to conventional treatment and its clinical course is variable. We experienced a case of progressive macular hypomelanosis that was successfully treated with narrow band UVB phototherapy. (Korean J Dermatol 2003;41(12):1664~1666)

여가활동 유형이 여가만족에 미치는 영향

김의영,김의영,김영숙,윤대중,이병기 龍仁大學校 武道硏究所 2002 武道硏究所誌 Vol.13 No.1

This research is designed to make a comparative analysis of the types of leisure activities and the degree of leisure satisfaction by demographic background variable and to present basic materials necessary for the development of programs for local policies on leisure in accordance with the local autonomous system with a view to determining the relationship between leisure and life satisfaction by type of leisure activity. The following are the findings. First, the survey on testing the difference of leisure satisfaction by gender failed to test the difference in psychological and physiological satisfaction, but there were a statistically significant difference in educational, social and relaxation satisfaction at a level of 1 percent. And the survey failed to test the difference in psychological satisfaction by age, but there was a statistically significant difference in leisure satisfaction by society, education, job, monthly income, and health. Second, the survey on the influences of the types of leisure activities on leisure satisfaction revealed that there was a statistically significant influences in all the subordinate variables of leisure satisfaction.

LLR의 분산값을 적용한 효율적인 반복중단 알고리즘

심병섭,정대호,김환용 원광대학교 공업기술개발연구소 2003 工業技術開發硏究誌 Vol.23 No.-

In this paper, it proposes the efficient iterative decoding stop criterion using the variance value of LLR. It is venfying that the proposal iterative decoding stop criterion can be reduced the average iterative decoding number compared to conventional schemes with a negligible degradation of the error performance. The proposal algorithm and hardware synthesize to use the Synopsys Tool, performance validations perform through the ModelSim.

계열화 및 전공코스제 운영방안

최병태,이형민,홍성준,정두진,김대곤 대구산업정보대학 2000 논문집 Vol.14 No.2

This paper is an attempt to propose our study that draw up a plan about faculty and major course to the Daegu Polytechnic College authorities. Our approach is a mixture of methods. It is systematic, in that it attempts to treat a college as a system. Through the second chapter, we examine the periodic, social, environmental, governmental, and economic context within which the College's developing effort must progress. Chapter three examines how the college systems actually design about faculty and major course. Thus, chapter four discusses how new faculty and major course participants attempt to compose a curriculum; chapter five accesses the institutions available in the College to distribute these designs. In conclusion, this paper presents that the College system would be better nine faculty; education and nurse·health field only be in administration unit, an information field be better divided into two parts: internet computer and information communication, and business and computer design faculty is established as intimate information. After all, the system will be characteristic in its information traits.

BOM에서의 조립 순서 생성을 고려한 확장성에 관한 연구

장현수,김대형,이병기 明知大學校 産業技術硏究所 2000 産業技術硏究所論文集 Vol.19 No.-

BOM has been widely used to manufacturing, product design and scheduling. There are several bug differences between Manufacturing BOM and Engineering BOM, which cause a lot of problems. A study to integrate both manufacturing BOM and Engineering BOM is researching to solve those problems. This thesis presents a extended Engineering BOM concepts considering assembly sequence model.

친환경 방염액의 연구

이순홍,김병량,문명욱,이대정,정영호 안양대학교 산업기술연구소 2004 自然科學硏究 Vol.11 No.1

대구 지하철 참사 이후 사회 전반적으로 방염에 대한 관심이 증대되어 방염제에 대한 연구가 활발하게 진행되고 있는 실정이다. 기존의 할로겐화 방염제는 방염제 자체의 독성으로 인해 인간의 건강과 환경에 유해성이 확인됨에 따라 이를 대체할 친환경 방염제의 연구가 부각되고 있는 시점이다. 본 연구에서는 친환경 대체 방염제의 일환으로 인계와 무기계 방염제를 혼합 사용하여 우수한 방염성능 및 연소시 유독가스가 발생되지 않는 친환경 방염제의 조성을 설계하고자 하였다. 인계 방염제로서 제1인산암모늄, 제2인산암모늄을 사용하였으며, 무기계 방염제로서 붕산과 붕사를 사용하여 각 조성 배합비의 함량 변화 실험을 통한 방염 특성 평가를 수행하였다. 이와 더불어 방염제의 부착률에 따라서 방염효과가 달라지는데, 최적의 조성으로 부착률을 달리하여 경제성과 법적인 측면을 고려하여 가장 효율적인 부착률을 알아보았다. The purpose of this research is to make a non toxic flame retardants as a substitute material for toxic halogen type, and to evaluate burning area, adhesion rate and flammability of non toxic flame retardants. The non toxic flame retardants were prepared by mixing processes of ammonium phosphate monobasic, ammonium phosphate dibasic, boric acid and borax under the various preparation conditions. Flammability of polyester fabrics treated with these mixed flame retardants was investigated through measurement of burning area and adhesion rate. The burning area values were decreased with increase of the Ammonium phosphate monobasic and ammonium phosphate dibasic content of flame retardants. For economic and legal reasons, the optimum adhesion rate of flame retardants on the polyester fabrics was 50%.

ULSI DRAM의 BIST 알고리즘을 위한 패턴발생회로 설계

온정근,김대익,도경주,이영훈,이창기,전병실 전북대학교 전자산업개발연구소 1991 전자산업연구 Vol.2 No.-

Lately, more developed semiconductor technolgy is, higher integration per one chip is rapidly. Mow 64 Mb DRAM is used 0.3㎛ techonology. This very large integration is caused faults of new type, and exhaused much time for test. So algorithms which distiguish at higher faults coverage. less time and cost of test is reported. In this paper control circuit of Built-In Self Test(BIST) Algorithm was designed for ULSI DRAM. This circuit generates patterns of the algorithm by input clocks.