경도의 두부 외상 후 사지마비로 발현된 경추부 후종인대 석회화

신병수,서만욱,김영현 대한노인병학회 2002 대한노인병학회지 Vol.6 No.1

캔틸레버형 변단면 포물선 아치의 자유진동

김종만,오상진,이병구 圓光大學校 1993 論文集 Vol.27 No.2

이 논문은 캔틸레버형 변단면 포물선 아치의 자유진동에 관한 연구이다. 아치가 진동할 때 아치미소요소에 작용하는 합응력과 관성력의 동적평형방정식을 이용하여 유도된 지배미분방정식에 포물선 아치를 적용하였다. 아치의 변단면으로는 1차원 변화단면과 2차원 변화단면을 적용하였으며, 단면형상으로는 변화높이 구형단면, 변화폭 구형단면 및 정방형단면을 택하였다. 유도된 미분방정식을 Improved Euler method와 행렬값탐사법으로 수치해석하여 캔틸레버형 변단면 포물선 아치의 고유진동수와 진동형을 산출하였다. 수치해석의 결과로 무차원 고유진동수와 아치높이 지간길이비, 단면비 미 세장비 사이의 관계를 그림에 나타내었으며, 이로부터 1차원 변화단면 아치와 2차원 변화단면 아치의 진동에 대한 강성 및 단면형상이 무차원 고유진동수에 미치는 영향을 고찰하였다. 또한 회전관성이 고유 진동수에 미치는 영향을 고찰하였으며, 진동형의 전형적인 예를 그림에 나타내었다. The main purpose of this paper is to present both fundamental and some higher natural frequencies of cantilevered parabolic arches with variable cross-section. The prime and quadratic parabolic arches are choosed, and three kinds of cross-sectional shape are considered in numerical analysis. As the numerical results, the natural frequencies are presented as the function of nondimensional system parameters: the rise to span length ratio, the section ratio and slenderness ratio. The effects of rotatory inertia and cross-sectional shape on the natural frequencies are investigated. The natural frequencies of prime and quadratic arches are compared and the typical mode shapes are also presented in figures.

단일클론 항 γ-Glutamyltrasferase(GCT) 항체를 이용한 혈뇌장벽 내 GGT의 분포에 관한 연구

이병규,김명곤,신규만,류총근 대한신경외과학회 1995 Journal of Korean neurosurgical society Vol.24 No.3

γ-Glutamyltransferase(GGT: E.C. 2.3.2.2.) is a glycoprotein enzyme which is involved in glutathione metabolism and amino acid transport through the plasma membrane. It is distributed widely in several organs including liver, kidney, pancrease and brain. GGTs derived from the brain of Wister rats and BALB/c mice were biochemically purified to a specific activity of 4246.2, 862.1 units per mg of protein, a purification folds 93.7, 43.8 and the final yield 65.8, 44.0% respectively. Electrophoretic pattern of purified GGTs from rats and mice brain shows very similar protein fraction each other. We have produced six monoclonal antibodies(GGT-MAb 1-6) against 2-acetamidofluorene treated rat liver GGT. Using these GGT-MAb 1-6 we performed immunohistochemistry(IHC) to study the distribution of GGY isozymes in normal tissues of rat brain and in ncoplastic tissues of human brain. The results indicated that human brain GGT was localized in pericytes of blood-brain barrier, especially in the blood-rich portion of the brain(e.g. cerebellum of rat, meningioma and craniopharyngioma of human). Therefore these MAbs may be used to evaluate the distribution of GGT isozymes in different tissues.

等分布 荷重을 받는 變斷面 보의 靜的 解析

李炳求,金憲相,牟正萬 圓光大學校 1992 論文集 Vol.26 No.2

이 論文은 等分布荷重이 작용하고 있는 變斷面 보의 靜的 解析에 관한 연구이다. 보의 변단면은 均一幅 變化높이의 矩形斷面으로 採擇하고 微少 처짐理論에 의한 휨-曲率 관계식을 이용하여 변단면 보의 정적 擧動을 지배하는 微分方程式을 유도하고, 이를 부정적분하였다. 미분방정식에 포함되어 있는 모멘트반력, 垂直反力 및 적분상수는 보의 端部條件에 의하여 결정하였다. 실제의 변단면 보의 해석에서는 힌지-힌지보, 힌지-固定보, 固定-固定보, 고정-힌지보, 固定-自由보의 단부조건을 택하였다. 수치 예의 결과로 斷面比와 모멘트반력, 수직반력, 최대 처짐 및 최대 綠端應力과의 관계를 그림에 나타내었다. 또한 휨 모멘트도 및 彈性曲線의 예를 그림에 나타내었다. An analytical method was developed to solve the tapered beams subjected to uniform loads. The rectangular cross-section with constant width and variable depth, so-called depth taper, was chosen. The differential equation of deflected beams based on the small deflection theory was derived and solved by indefinite integration. The unknown parameters and integral constants were calculated by the boundary conditions. The hinged-hinged, hinged-clmped, clamped-clamped clamped-hinged and clamped-free beams were considered in the numerical examples. As the results of this study, the reaction moments of left ends, the vertical reactions of left ends, the maximum deflection and the maximum stresses versus section ratios were presented in figures. Also both typical bending moment diagrams and deflection curves were presented in figures. It is expected that the results of this study including both all equations and figures can be used in design of the tapered beams.

연 착화제 효능에 관한 동물실험적 연구

서병성,김준연,김정만,김용규,정갑열,김성환,김인식,김병권 동아대학교 부설 산업의학연구소 1997 산업의학연구소 논총 Vol.- No.3

This experiment was carried out to compare the efficacy of 2,3-dimercaptosuccinic acid(DMSA) and calcium ethylenediamine tetraacetate(CaEDTA) as chelating agents for lead poisoning. The rats had been fed water containing 0.5% lead acetate for 3 months and randomly divided into three groups. We administered DMSA only for group I(n=5), CaEDTA only for group II(n=5), and both DMSA and CaEDTA for group III(n=10), for 4 days. We evaluated urinary lead(PbU) level, blood lead(PbB) level and blood zinc protoporphyrin(ZPP) level before and after administration of the chelating agents. The results obtained were as follows; 1. After administration of chelating agents, the mean PbU levels, which were 248.2㎍/dl, 252.6㎍/dl and 270.0㎍/dl in group I, II and III before administration, were increased to 484.6㎍/dl, 479.9㎍/dl and 1,792.1㎍/dl in group I, II and III, respectively(p<0.05). 2. After administration of chelating agents, the mean PbB levels, which were 67.4㎍/dl, 59.9㎍/dl and 62.5㎍/dl in group I, II and III before administration, were decreased to 38.1㎍/dl, 36.3㎍/dl and 31.3㎍/dl in group I, II and III, respectively(p<0.05), but there were no different changes of ZPP level among groups. 3. The blood lead clearances, which were calculated by PbB level before and after administration of chelating agents, were 49.8%, 43.5% and 39.5% in group III, I and II, respectively.

노동복지의 국가별 접근유형에 관한 비교연구 : 북유럽,미국,일본을 중심으로

이병훈,류만희 한국산업노동학회 2002 산업노동연구 Vol.8 No.2

이 논문에서는 북유럽 국가(스웨덴과 노르웨이), 미국, 그리고 일본을 중심으로 노동복지에 대한 국가별 정책적 접근유형을 비교하고 있다. 스웨덴·노르웨이는 강력한 노동조합운동의 정치적 영향력과 사민당 정부의 보편주의적 사회복지정책기조를 배경으로 제한적인 비중의 민간 기업복지 조차 국가복지로 '도약'하여 수렴됨으로써 국가복지 수렴형의 노동복지체제로 특징지을 수 있다. 반면에, 미국의 경우에는 실리주의 노선의 노동조합운동 전통과 국가복지 확대에 대한 정부의 미온적인 정책입장 등으로 인해 민간 기업복지 중심의 시장의존적인 노동복지체제, 즉 기업들의 시장지배력에 연동되어 노동자들에 대한 부가급여의 제공수준이 결정되는 기업복지 주도형의 복지모델이 고착화도어 왔다. 그 결과, 스칸디나비아국가에서는 노동자계층 내부의 복지격차는 원천적으로 억제될 수 있었던 것에 반해, 미국에서는 이러한 노동복지의 격차문제가 방치되거나 오히려 확대되는 것을 정책적으로 조장하기까지 하고 있다. 일본의 경우에는 전후 경제성장연대의 기간에는 민간 기업복지 중심의 노동복지체계가 구축되었으나, 1980년대 이후 복지격차를 완화하기 위한 정책적 노력의 일환으로 사회보장체계의 점진적 확대적용을 통한 법정화된 기업복지의 비중 중대와 중소기업근로자복지서비스센터에 대한 설립 및 운영의 지원이 이루어지면서 준공공복지의 영역이 확대되어 취약한 국가복지를 보완하고 있는 것으로 드러났다. 이 글의 결론에서는 일본의 준 공공복지 보완모델이 국내 노동자계층내부의 복지격차를 해소하기 위한 현실적인 대안이 될 수 있다는 점을 제언하고 하고 있다. This study compares and classifies national policy approaches to labor welfare among Northern European states(i.e. Sweden and Norway), US, and Japan. In Sweden and Norway, the labor welfare regime is categorized as the “state welfare-convergency” model, in that the limited private company welfare has been frog-leaped and converged into the public state welfare against the backdrop of labor union’s strong political influence and the SDP-led government’s univeralistic welfare policy. By contrast, the “private company welfare-driven” model, in which the level of welfare compensation, given to workers, is primarily determined by the market power of companies, has been forged in the US, because of the tradition of business unionism and the government’s inactive position on the expansion of public state welfare. As a consequence, the welfare gap in the working class has to a large extent been constrained in those Scandinavian countries, whereas the discrepancy of labor welfare in the US has been taken for granted and even widened by the government’s policy to encourage the diffusion of private welfare packages. In Japan, where the private company welfare-dominated model was formed during the post-war period of economic development, the semi-public welfare system has since 1980s been expanded by assisting the weak state welfare with the government’s policy to gradually increase companies’ legal contribution of social welfare and promote the establishment and operation of non-government labor welfare service centers for workers of small-sized companies. It is suggested as a conclusion that the “semi-public welfare-aided” model, illustrated in Japan, need to be considered as a meaningful policy approach for resolving the widening discrepancy of labor welfare among workers in Korea.

연 착화제 효능에 관한 동물실험적 연구

김정만,김병권,김성환,서병성,김인식,김용규,정갑열,김준연 동아대학교의과대학 1997 동아의대학술지 Vol.9 No.1

양단힌지 비대칭 포물선아치의 자유진동에 관한 연구

이병구,남궁문,김종만 圓光大學校 1986 論文集 Vol.20 No.2

양단힌지 비대칭 포물선아치의 자유진동을 지배하는 미분방정식가 경계조건을 D'Alembert원리와 평형방정식을 이용하여 유도하였다. 유도된 미분방정식에는 회전관성의 영향을 고려하였다. 위의 미분방벙식을 수치적분하기 위하여 Runge-Kutta Method가 이용되었으며, 고유 진동수 매개변수의 값F를 찾기 위하여 시행착오적 고유치문제가 이용되었다. 상세연구로는 양단힌지 포물선아치의 최저차의 3개의 고유진동수를 해석하였다. 회전관성이 고유진동수에 미치는 영향은 무시할 정도로 작았다. 또한 수치해석의 결과로 고유진동수-아치 지간길이의 관계를 그림에 나타내었다. The governing differential equations and the boundary conditions for the free vibration of hinged ended unsymmetric parabolic arch are derived on the basis of the equilibrium equations and the D'Alembert principle. The effect of rotary inertia as well as extentional and flexural deformations is considered in governing differential equations. A trial eigen value method is used for determining the natural frequencies. The Runge-Kutta method is used in this method to perform the integration of the differential equations. The detailed studies are made of the lowest three vibration frequencies for the hinged ended unsymmetric parabolic arches. The effect of the rotary inertia is analyzed and it's numerical data are presented in table. And as the numerical result the frequency versus the span length of arch is presented in figure.

二重歸還方式을 理用한 廣帶域 增幅回路의 設計

田炳實,趙正萬,김종교 全北大學校 1978 論文集 Vol.20 No.-

Many advantages are to be obtained from the use of negative feedback, at the cost of gain. These are as follows; the increase of frequency band-width, the improvement of amplification stability, the decrease of nonlinear distortion and noise, and the simplicity of impedance matching, etc. Many of electronic devices require wide frequency bands. For example, a cathode-ray oscilloscope, in order to cover the frequency range of 0 to 20 MHZ, requires an amplifier with the frequency band over 20 MHZ. Moreover, communication devices require the very wide frequency bands of several hundreds MHZ. A negative feedback is used widely in order to obtain the devices with wide frequency bands. This paper describes the analysis and the practical synthesis procedure of the design of shaped gain, wide-band, impedance matched, dual loop feedback amplifier that uses a cascade of two common emitter transistor stages. An amplifier is designed to have the lower cut-off frequency of 50MHZ. Experimental results are coincident to the specified characteristics as well.

중학교 체육수업시 수행평가 실행에 대한 학생들의 의식 분석

이병관,윤만형 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.2

The purpose of this study was to investigate the effective plans of performance assessment from an analysis of students' positive and negative perceptions, expectant mode on performance assessment in middle school physical education class. Participators of this study were 275 middle school students from purposive sampling. The contents of this study consisted of positive perceptions, negative perceptions, and expectant mode on physical education performance assessment. And the data was inductively examined through four steps. The conclusions of this study were as follows. The positive perceptions' dimensions of physical education performance assessment were 6 categories; (l)the upgrade of participant intention (2)the progress of motor-performance (3)the assessment of individual's differences (4)the assessment of various factors (5)the effective management of classes (6)the others. The negative perceptions' dimensions of physical education performance assessment were 5 categories; (1) psychological stress (2)insufficient exercise time (3)excessive assessment's criterion (4)the insufficient management of classes (5)the others. And the plans of physical education performance assessment were 5 categories; (l)the proposals of suitable assessment's criterion (2)the proper selection of events (3)the perfect management of classes (4)the assessment of various factors (5)the others. Consequently, middle school students who are doing physical education performance assessment participate intentionally in a class and progress the motor-performance, but they experience psychological stress and insufficient exercise time. Therefore, the future of physical education performance assessment should be carried out four factors; the proposals of suitable assessment's criterion, the proper selection of events, the perfect management of classes, and the assessment of various factors.