위상 변조기를 이용한 펄스 압축

명승일,한상진,서동선 明知大學校 産業技術硏究所 1999 産業技術硏究所論文集 Vol.18 No.-

We describe a chirped pulse compression in which a sinusoidally driven phase modulator generates frequency chirped pulse that are subsequency compressed by a dispersive fiber. In contrast to other methods such as self-phase modulation, this approach of pulse compression does not depend on the optical power and thus shows promise for application to low-power lasers. Using this method we produce nearly transform-limited pulses of ∼14 ps at 10㎓.

뇌공승 煎湯液이 마우스의 免疫抑制에 미치는 影響

明成俊,金炯均,宋峰根 圓光大學校 韓醫學硏究所 1994 원광한의학 Vol.4 No.1

이득 스위칭 반도체 레이저의 직접 변조

명승일,이상훈,엄정현,서동선 명지대학교 대학원 1997 대학원논문집 Vol.1 No.-

본 논문에서는 이득 스위칭 반도체 레이저의 직접 변조에 의한 1Gbps RZ 데이터 펄스 발생에 관한 이론적 분석 및 실험 결과를 발표한다. 데이터의 패턴 의존 효과를 제거하기 위해, DC 바이어스, NRZ 데이터, 및 RF 신호 전류로 적절히 조합된 전류 파형으로 페이저를 동작시켰다. 각 전류 성분의 변화가 변조 출력에 미치는 영향을 탐구하여 최적 값을 결정하였다. 출력의 눈 패턴은 DC 바이어스 및 NRZ 데이터 전류 변화에 민감한 것으로 나타났으며, RF 신호 전류에는 비교적 덜 민감하게 나타났다. We present our numerical and experimental results of 1 Gbps return-to-zero data pulse generation by direct modulation of a gain-switched semiconductor laser. To eliminate data pattern dependent effects, the laser is operated by a current waveform which deliberately combines DC bias, RF sinusoidal, and NRZ data currents. The effects of change in each current component on the modulated output are explored and the optimum value of the current is determined. Our results show that the eye pattern of the output is more sensitive to the DC bias and NRZ data current and relatively less sensitive to the RF current.

심한 변비와 복부팽만으로 발견된 소아 크론병 1예

성명순,강석정,최광해 영남대학교 의과대학 2008 Yeungnam University Journal of Medicine Vol.25 No.2

Crohn's disease is a chronic inflammatory bowel disease that mainly affects children and young adults, Its cause remains unknown. The incidence of pediatric Crohn's disease is increasing, so it is important for clinicians to be aware of the presentation of this disease in the pediatric population The majority of patients complain of abdominal pain (72%), with only 25% Presenting with the 'classical triad' of abdominal pain, weight loss, and diarrhea. Many children with Crohn's disease present in a 'non-classical' manner, with vague complaints such as lethargy or anorexia, which may be associated with only mild abdominal discomfort Other symptoms include fever, nausea, vomiting, growth retardation, malnutrition, delayed Puberty, Psychiatric symptoms, arthropathy, and erythema nodosum. Severe constipation and abdominal distension are uncommon symptoms at diagnosis. We report a case of pediatric Crohn's disease, which was diagnosed after the patient presented with severe constipation and abdominal distension.

樹木의 水分特性에 關한 生理 ·生態學的 解析(XI) : 落葉 闊葉澍 21種의 分枝部의 氷分通導性의 比較

韓相燮,金宣憙,李明鐘 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-

이 硏究는 우리 나라 主要 落葉 關葉樹 21種에 대하여 分枝部(branch junctions)의 相對水分通導性(relative conductivity, RC), leaf specific conductivity(LSC), Huber value(HV), specific conduc-tivity(SC) 등의 水分通導性(hydraulic conductivity, HC), 그리고 邊材部의 平均 導管直徑(㎛)과 導管數(No./m㎡) 등을 測定하여 分枝部의 水分通導 This study was performed to compare the characteristics of hydraulic conductivity such as relative conductivity(RC), leaf specific conductivity(LSC) , Huber value(HV), specific conductivity(SC), anddiameter of vessels(㎛) and number of vessels(No. /㎟) in branch junctions of the twenty-one decidu-ous broad-leaved species. The hydraulic conductivities of branch junctions decreased with increasing junction angle between stem and branch, and with decreasing diameter of branch, The RC and LSC of branch junctions related to branching types(ㅏ, Y, Ψ type) were much lower in ㅏ and Ψ types than in Y type, The diameter and number of vessels remarkably reduced in branch junctions as compared with the stem and branch.

DMA 가스 검지를 위한 ZnO 박막의 aging 효과

김성우,최혁환,이명교,권태하 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

The DMA(Dimethylamine) gas sensors were fabricated with the ZnO-based thin films grown by a RF magnetron sputtering method. The characteristics of the sensors to aging conditions were investicated. The sensors with ZnO-based thin films aged for 72hrs at a temperature of 330 ℃ in oxygen showed high sensitivity, low working temperature and good linearity. The sensors with ZnO-based thin film doped with 0.1 wt.% Pt catalytics and aged for 72hrs at a temperature of 330 ℃ in oxygen showed the maximum sensitivity of 90 at a working temperature of 150 ℃ and to DMA gas of 160 ppm. The sensor was electrically stablized.

두경부 악성 림프종의 면역조직화학적 유형분석 및 Epstein-Barr virus의 검출

김성현,전세영,임동명 조선대학교 부설 의학연구소 1999 The Medical Journal of Chosun University Vol.24 No.1

Background and Objectives : The Epstein-Barr virus(EBV) is a human herpes virus which causes infectious mononucleosis and is associated with such human cancers as Burkitt's lymphoma and nasopharyngeal carcinoma. However, the role of EBV as a causative factor in other head and neck tumors is not fully elucidated. Malignant lymphoma is a tumor of the immune system which is commonly known as a non-epithelioid tumor of the head and neck region. Recent studies have suggested a probable etiologic association between EBV and lymphomas. This study was performed to investigate the strength of the association of EBV with malignant lymphoma and to carry out an immunohistochemical classification. Materials and Methods : Twenty one cases of non-Hodgkin's lymphoma tissues in the head and neck were used. Immunohistochemical staining was carried out with EBV protein, CD20 and CD3. Results : Among the 21 cases of malignant lymphoma, 9(43%) of the cases were of B cell lineage, 10(48%) of the cases of T cell lineage and 2(10%) of the cases were of an unclassifiable type. The commonest histopathologic type were diffuse large cell types and diffuse mixed types in 8(38%) of the cases. All 6 cases(100%) of nasal/paranasal sinus lymphoma were T-cell lymphoma. The detection rate of EBV in malignant lymphoma tissue was 52%. EBV was detected in 5 cases(56%) of B-cell lineage and 6 cases(60%) of T-cell lineage. Among 6 cases of nasal/paranasal sinus T-cell lymphoma, 4(67%) were positive for anti-human EBV protein. In the positive cases, a large number of the neoplastic cells and infiltrated lymphocytes showed strong nuclear signals. Conclusion : These results suggest that most nasal/paranasal sinus lymphomas are T-cell type neoplasms and EBV probably plays an etiologic role in the pathogenesis of group nasal/paranasal sinus T-cell lymphomas.

도시지역 소외계층 교육복지 문제점과 발전과제

신상명,신윤섭 경북대학교 사범대학부속 중등교육연구소 2003 중등교육연구 Vol.51 No.2

This paper purposes to study the presentation of education welfare and development tasks for a class of alienation in urban area. Education is essential of human life and a nation is in charge of that. So, the commitment for the class of alienation is inevitable duty of welfare states. Our nation`s educational welfare policy staying passive welfare like supplying school expenses or school free meals. Through the passive welfare policy, a nation can`t accomplish nation's development of human resource illumination and integration of society. Now a nation needs positive educational welfare policy for the class of alienation in urban area. The ultimate goal of positive educational welfare prepose of student's whole man development. The whole man development of student is accomplished by academic achievement, physical development, characteristic development. First, basic learning capacity development, expansion of scholarship and learning condition are to be equipped for security of academic achievements. Second, school execute medical benefits and expand school free meals for the physical development. Third, the nation must develop family faculty supporting programs and serve diverse cultural experiences for the characteristic development.

부산 금정산일대 용천수, 지하수 및 지열수의 지화학적 특성

조명희,함세영,한석종,성익환,이병대,조병욱 부산대학교 환경문제연구소 1999 環境硏究報 Vol.17 No.1

Spring, groundwater and thermal water from the area and the vicinity of Mt. Geumjeong and Mt. Baekyang, Pusan city, has been sampled and analyzed for major and minor elements. According to the Piper diagram, spring water belongs to Ca^2^+-HCO_3^- and Na^+-HCO_3^- types, groundwater to Ca^2^+-HCO_3^- type, and thermal water to Na^+-CI^- type. Based on the phase stability diagrams of [Ca^2^+I/[H^+]^2, [Mg^2^^+I/[H^+]^2, and [Na^+I/[H^+] vs. [H_4SiO_4], spring water, groundwater and thermal water are mostly in equilibrium with kaolinite. The result of factor analysis shows three factors (factor 1,2 and factor 3) for the spring water, the groundwater and the thermal water which are represented by the influence of the dissolution of feldspar, calcite, anthropogenic sources (domestic and industrial wastes) and salt water.

기업규모와 연구개발 활동간의 관련성에 관한 연구

반성식,김동훈,이동명 진주산업대학교 1999 산업과학기술연구소보 Vol.- No.6

The purpose of this study is to examine empirically the relationship between firm size and R&D activity. The samples consist of 73 korean manufacturing firms listed on the Korea Stock Exchange on march 1997. The dependent variables are R&D expenditures, R&D to sales, the number of Korea invention patents issued. Independent variables include two measures of firm size(firm sales), sales growth. Correlation analysis and multiple regression(linear regression and nonlinear regression)analysis were performed to test the relationship between R&D investment and firm size, and that between patents and firm size, linear and nonlinear quadratic regression methods were performed. The results show a tendency that firm size relate to R&D activity. The conclusion of this study is as follows: (1)Inventive outputs(R&D expenditure and patents) increase with firm sales, but decrease at a peak point.(2)Inventive outputs appear not to be systematically related to variations in sales growth.