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      • 점성토(c-ø흙)로 뒤채움된 중력식 옹벽에서의 인장균열 및 수평토압

        오병수 동아대학교 대학원 1997 국내석사

        RANK : 1839

        옹벽을 설계하기 위하여 실무에서는 일반적으로 Coulomb의 토압이론을 대부분 사용하고 있는 반면에, Coulomb의 토압이론에서도 전토압의 작용점위치를 얻을 수 없으므로 토압을 삼각형분포라고 가정하였다. 그러나, 수많은 실내 및 현장실험의 결과를 보면, 토압분포가 삼각형분포가 아니므로 전토압의 작용점위치는 옹벽저판으로부터 H/3지점에 있지 않음을 실험적으로 입증하였다. 따라서, 본 연구에서는 c-ø흙으로 뒤채움된 지표면이 경사지고, 옹벽배면이 경사진 중력식옹벽에 작용하는 토압이론식을 인장균열을 무시한 경우와 고려한 경우에 대하여 Coulomb의 흙쐐기와 아칭개념을 이용하여 배수 및 비배수해석으로 토압이론식을 각각 유도하였으며, 또한 기존의 이론식과 비교하였다. 새로이 제안된 이론식의 해석결과, 제안된 이론식의 토압분포는 δ=0 및 δ=ø인 경우를 제외하고는 포물선 및 확산형의 토압분포를 나타내었다. 새로이 제안된 이론식의 토압분포는 부착력 (c_(w)) 및 벽면 마찰각 (δ)의 크기보다 벽체의 경사각 (α), 내부마찰각 (ø), 뒤채움경사각 (β) 및 점착력(c)의 변화에 따라 주로 좌우되었다. 새로이 제안된 이론식에 의한 전수평토압은 비배수해석 시에는 Rankine의 이론을 제외하고, 그 밖의 기존의 이론식들과 좋은 일치를 보였으나, 배수해석 시에는 기존의 이론식들과는 상이한 결과를 나타내었다. Coulomb's theory has been usually used in practice for design of retaining walls. This theory assumed that the lateral earth pressure was a triangular distribution, then the point of applying the thrust could not be abtained. However, the results of laboratory and field' tests proved that the lateral earth pressure was not a triangular distribution. In this study, for gravity walls with inclined backface and surface, backfilled c-ø soils with inclined surface, an analytical method for earth pressure has been derived by using the flat arching concept and the Coulomb's wedge, under drained and undrained conditions, for the cases of neglecting and considering tension crack, respectively. In addition, this paper is dealing with comparing the new analytical solution with existed theories for such cases. The results of analysis by the new formulae are as follows: Firstly, the lateral earth pressure by the new formulae is not a linear but a non-linear distribution, for both cases of neglecting and considering the tension crack. Secondly, lateral earth pressure distribution of the new formulae depend mainly upon the angle of backface of wall (α), the sloping angle (β), internal friction angle (ø) and cohesion (c). However, the adhesion (c_(w)) and the angle of well friction (δ) are minor factors. Finally, the thrust obtained by the suggested formulae herein agrees well with those by the existed theories under undrained condition, except the Rankine's solution. But, under drained condition it is not such.

      • 太陽追跡 실린더型 抛物面集熱器의 熱解析

        오병수 全南大學校 大學院 1980 국내석사

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        A simple theoretical anaylisis and an experiment are carried out for a modified concentrating collector which consists of a sun tracking cylindrical parabolic reflector, a copper tube centered along the focal line and liquid which flows in the copper tube to absorb the concentrated solar beam radiation. The analytical and experimental vesults proved as follows. Important factors of efficiency drop are the reflectivity and the difference between absorptivity and emissivity. Exact sun tracking and cloud cover effect are very important factors in absorbed solar energy.

      • 進路敎育 프로그램이 進路 價値觀에 미치는 影響

        오병수 建國大學校 社會科學大學院 1992 국내석사

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        A. The necessity and aim of study In 2000's. to adapt to the highly-industrialized society and informationized ages, the necessary information to future career should be proveded and so the ability and valuation to be required in career life should be cultivated. Therefore this research aims at providing the proved materials about the guidance for career, for which the value orientation to career between the application group and the non-application group has been compared and analyzed. B. The subject of study In order to verify the effect of career education program, the subjects were set up as these 1. There may be the difference in value orientation to career between the application group and the nonapplication group to the career education program. 2. There may be the difference in value orientation to career among reqions, jobs, and school career of parents. 3. There may be the difference in value orientation to career between sex distinction and grades of students. C. The method of study The 600 boy and girl students who are in the second and third graders in township(Myon), towns and cities of Chungbuk Province were selected as the sampled object of the non-application group, and students who are in Uˇmsoˇng High School were chosen as the objects of the application group to this program. The 50 questionaires, the experiment tool, were divided into 10 lower variables and both groups were analyzed through t-test by variables. As the experiment procedure and the method of verification, the subject 1, 2 and 3 were analyzed by t-test and the analysis of variance, with the before-experiment test and the after-experiment test. D. The result of study The value orientation to career between the application group and the non-application group to career education program, compared and analyzed after the before and alteresperiment t-test. 1. In the regional value orientation to career, the experiment group, compared with the city group, showed the significant difference at the level of p<.02 and at the level of p<.005, compared with the town and the township (Myorl) group. 2. In the comparison of the male and female value orientation to career, the result having investigated the value orientation to career between the experiment group which it was abjusted to and the comparison group revealed the significant difference at the significant level p<.02(boy students) and p<.01 (girl students). 3. In the grade comparison of the career orientation to career, the result of t-test showed the significant difference of p<.001(both the second and third graders), and the third graders showed a more significant difference than the second graders. 4. In the comparison about the school career of parents, the students brought up by parents with higher school career showen more interest in the recognition of value orientation to career. In the comparison about the students brought up by the parents who graduated from the primary school and those who were brought up by the parents whose school career was college, the significant difference at the level of p<.05 was revealed. 5. In the analysis about the value orientation to career according to the parental job, as a result of the investigation divided into 7 fields, the children of the company employees showed the significant difference at the level of p<.05. and those of the public officials did so at the high level. The children of the company employees and those of the peasants and so showed the significant difference at the level of p<.01. 6. In the comparison of the 10 lower variables, the experiment group showed the significant difference at the level of p<.02 and only in the money variable the comparison group showed the more significant difference than the experiment group at the level of p<.02 in the recognition about the money, the outer value. 5. The conclusion On the basis of the result acguired from the above study, the following conclusion was derived. 1. The selection of the career education aim and the system model could be sought and planned, and the appropriate input method and evaluation method of the career education program could be sought. 2. The ability and attitude to acguire the various career information about jobs or the courses of college, and to reasonably decide their own career were expanded. 3. In the change of valuation measure between the variables except the money variable, the outer value, the affirmative reaction appeared, and the value orientation to career of the application group was much extended.

      • 硏究系知識分子群體的國家建設構想及其實踐(1911-32)

        吳炳守 復旦大學 2001 해외박사

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        This thesis is to understand the process of China's nation-building during the republican period of 1911-49 by looking at the development of intellectuals' ideas on nation-building and the structure of the 'opinion venue' in which the ideas competed one another. For this end, I tried to make a concrete analysis on the nation-building idea and practice of the intellectuals of the 'research circles'. The legitimacy (or the basis of governing) of a modern nation lies in the protection of happiness and security of the governed not by the transcendent morality or absolute value but by the concrete political behaviour. And the process of nation-building consists of two different processes i.e. the establishment of state apparatus and the making of modern national. Depending on the power of culture, the intellectuals play a very important role in the emergence of modern national, firstly, by interpreting all the changes which occur during the long and complicated process of nation-building and, secondly, by showing the path of right evolution. Therefore, the opinion venue in which various ideas on nation-building compete one another shows well the characteristics of the process of nation-building. This paper is to understand the process of nation-building through the explanation of the role of the intellectuals in it as they were a nucleus of social integration. The terminology of 'research circles' (RC) did not represent a concrete object or concept. It was an abstract one which came out of the 'opinion venue'. It contained three implicit meanings which were all negative and different from one another in mentioning their respective object. Among them the intellectuals of the RC did stand out 梁계超Liang Qi-chao. He dominated the 'opinion venue' on the basis of the power of culture which had been rapidly and broadly formulated after May 4th Movement. Others included 張동선 Zhang Dong-sun, 張君매Zhang Jun-mai, 난公武Lan Gong-Wu, Jiang Fang-zhen and their sympathizers. The intellectuals of the'RC(RCI) were formed as they actively joined the politics in the beginning of the republican era but the origin of the circles could go back to the traditional gentry class in China. Afterwards they established the State Socialist Party and pursued the politics governed by reason, which, in turn, would limit state power through the autonomy of society. Naturally, they were very critical of the rule and its legitimacy of the Nationalist Government. This thesis analyses the changes of their ideas on nation-building and practice over time from the three major perspectives. Firstly, it analyses their thoughts on the relation between state and society, especially on the basis of social integration and legitimacy. Secondly, it pays attention to the dynamic relation between their ideas on nation-building and the 'opinion venue'. Through this, the thesis tries to show that the process of nation-building could be understood as a structural process in which various factors joined in the formation of nation while competing one another. Thirdly, it also tries to look at the issue of their self-consciousness and social role as an intellectual in this process. Further, it shows through their process of politicization how they overcame their traditional gentry class origin and reached a level of universal value. The research results are as follows; The RCI began to form as they had actively spread their political ideas which took shape largely under Yang's influence in the political arena at the beginning of the republican era. Yang strongly advocated the party politics from the start. Yang's political ideas was to put an emphasis upon the role of intellectuals under the condition of China's lack of citizen society in adjusting the conflicting interests among various political forces and checking the Revolutionary and Yuan Shi-kai. He regarded the intellectuals as a representative of social reason armed with political knowledge and morality and a main force of social integration. In other words, the intellectuals should check the state power for politically unmature people, speak for the interest of people through joining the parliamentary politics and guide the opinion of people. To this end the research circles advocated the party politics and the drawing-up of a constitution. However, the Yuan Shi-kai's dictatorship crushed the party politics and, accordingly, the RCIs' political ideas and action had to change. They interpreted the Yuan's dictatorship as both the personalization and the unlimited expansion of state power. Therefore, they made various political moves in order to fight the state power through the gathering of social forces. They advocated a new culture movement to separate morality and literature from politics. And they also maintained to reduce the state power within the administrative arena through cabinet and federation system and to rearrange the governing unit of people to the minimum in which the autonomy of people itself would be possible. Particularly they advocated the coalition of the progressives in order to confront the political collusion of the state power and the reactionaries and endeavored to link the forces of the progressives through the publishment of ChenZhongBao. This provided a basis for Yang, afterwards, to develop his ideas of 'no-party-ism'. However, their political objective was the recovery of a politics based on a constitution and the intellectual was still regarded as a 'wise man' to speak for the interests of unmature people. They started to think the relation between state and society from a new perspective as the parliamentary experiment collapsed in China and the new thoughts from the west began to be accepted after W W I. Particularly they consumed Kantism and Guild Socialism with the background of no legitimacy of regime in China and the advocacy of self-determination, and pursued the formation of ethical citizenship and systemization of social forces of reason. Their ideas were often transformed in a practical level, for instance, into a job-representative system, federationism or cooperationism. They dominated the opinion venue, advocating the coalition of the intellectuals, which was the influence of Kantism. But they only maintained the political awareness of people and the enhancement of autonomy power but failed to realize these as a political means. The intellectuals were merely regarded as a group to instigate and heighten the reason of society. The civil wars between warlords and the rapid development of Nationalist Revolution again made them rethink the importance of state, which was embodied as their establishment of the State Socialist Party in 1932. However, while admitting the leadership of state in the economic development planning, they maintained the reasonization of state through the protection of human rights and the introduction of a constitution. There was no change in their argument that the legitimacy of state came from the guarantee of society autonomy and individual creativeness and that the state power should be limited by reason. Though their establishment of the State Socialist Party had a meaning in folding the intellectuals through a concrete party regulation which used to be loosely connected through a person acquaintance, they failed to develop their party into a mass political body based on citizenship. They solicited many intellectuals who were critical of the Nationalist Party and this became a basis to found the Democratic Political Alliance later. As we can infer from the charateristics of China's nation-building which lacked the experience of a rule under a constitution, their ideas that the state power should be limited by the reason of society did not carry much weight in the real politics. They only succeeded in realization of their political manifesto through the establishment of a political party. The Chinese revolution was accomplished as the peasant class was organised as an army and as the demand by the forces of the reason of society was accepted in a form of manifesto. The destruction of manifesto means the crushing of the forces of the reason of society. The criticism on this goes back to the tradition of the continuous maintenance of the rule under a constitution by the research circles. The ideas and thoughts of the research circles still shed some light on the reality of China which has been looking for the construction of socialist civilization as a social integration since its opening of 1978.

      • 활성탄을 사용한 오존/촉매 공정의 메카니즘 규명 및 폐수처리 적용에 관한 연구

        오병수 연세대학교 대학원 2003 국내석사

        RANK : 1839

        본 연구에서는 활성탄을 이용하여 오존 분해에 대한 반응기작을 규명하고자 하였으며, 실 공정에 대한 적용성을 알아보기 위하여 폐수를 대상을 처리 효율을 평가하였다. 또한 촉매로서 효율을 향상시키고자 활성탄에 금속(망간, 철)을 담지 하여 오존 분해 및 유기물 제거에 대한 평가를 수행하였다. 활성탄에 의한 오존의 분해 반응에 대한 kinetic 연구가 회분식과 반회분식 조건에서 수행되었으며, 활성탄에 의한 오존 분해 속도상수인 k_(GAC)값이 각 조건에서 계산되었다. 다양한 pH 조건에서 오존의 물질전달 반응을 고려하여 오존 분해를 비교한 결과, pH4.3에서 가장 높은 반응성을 보였다. 이에 대한 반응기작으로서 오존과 활성탄의 반응성에 따라 세 영역으로 나누어 설명하였고, 최종적으로 활성탄에 오존이 흡착되어 H+이온에 의해 활성탄 표면에서 하이드록실 라디칼(OH°)을 생성하여 bulk 영역에서와 유사한 radical chain cycle을 형성하는 반응기작을 제안하였다. OH°의 생성량을 간접적으로 측정할 수 있는 Rct 값에서 망간 담지 활성탄이 가장 높은 값을 나타내었다. Promoter/Inhibitor ratio (P/I ratio)를 달리하여 오존 분해에 대한 각 촉매의 효율을 비교하였을 때 망간 담지 활성탄의 가장 높은 효율을 알 수 있었으며, 강산조건(pH2)에서 오존/촉매 공정에 promoter를 첨가하였을 때 오존 분해속도는 활성탄에 의해 증가하지 않은 반면, 금속 담지 활성탄은 망간과 철 모두에서 오존의 분해속도를 증가하는 사실을 알 수 있었다. 폐수처리에 오존/촉매 공정의 적용 시 망간 담지 활성탄에 의해 가장 높은 효율을 보였으며 활성탄의 표면에 흡착된 유기물은 오존과 활성탄의 표면반응에 의해 2차 산화에 의해 제거될 수 있다는 것을 입증하였다. This study was to investigate the mechanism of the ozone decay reaction by GAC(Granular Activated Carbon) as a catalyst and to evaluate the treatment efficiency of the wastewater for the practical use. Also, GAC was doped with Mn and Fe to enhance the ability of catalyst for the oxidation of organics during ozonatoin. The kinetic study for the reaction between ozone and GAC was conducted in the condition of batch and semi-batch reactors and k_(GAC) (ozone decay rate constant by GAC) was calculated in each experimental condition. In variety of pH, the GAC showed the highest reactivity for ozone decomposition at pH4.3. To propose the mechanism of the reaction between ozone and GAC, the fate of ozone mass transfer in prresence of GAC was explained in the three regions. Finally, it could be proposed that the ozone molecular adsorbed on the surface of GAC is converted into OH radical forming radical chain cycle like the bulk phase. The comparison between GAC and metal doped-GAC as a catalyst for ozone/catalyst process was performed by considering Rct value and P/I ratio. As the results, Mn doped-GAC was more effective than other catalysts used in this study. In the acidic condition(pH2), ozone decay rate was not increased by dosing promoter in presence of GAC, but metal doped-GAC showed the different result, which promotes the ozone decomposition in presence of it. Mn doped-GAC was evaluated as a best catalyst for removing COD and TOC of wastewater. It was also found that the organics adsorbed by GAC could be secondarily oxidized by the surface reaction between ozone and GAC.

      • 굴삭기용 사판식 액셜피스톤 펌프의 맥동 해석 및 브랜치호스 적용에 관한 연구

        오병수 울산대학교 자동차선박기술대학원 2006 국내석사

        RANK : 1839

        건설기계에 많이 이용되는 사판식 액셜피스톤 펌프는 고효율, 저렴한 운전비용, 고압에서의 사용이 가능하기 때문에 널리 사용되고 있으나, 가격이 고가이고, 토출 압력 맥동에 의한 문제를 지니고 있다. 본 연구에서는 사판식 액셜피스톤 펌프의 맥동 발생 메커니즘을 수학적 모델로 도출하고, 관로에서의 유량 맥동을 전달 매트릭스법을 사용하여 표현하였다. 맥동 발생 메커니즘의 수학적 모델을 상용해석 툴인 AMEsim을 이용하여 시뮬레이션 프로그램을 만들었다. 시뮬레이션 프로그램의 정확도를 검증하기 위하여 굴삭기 실차 시험을 실시하였으며, 펌프 맥동을 해석하는 데 적합하다는 결론을 얻었다. 여기에서 만든 시뮬레이션 프로그램을 이용하여 펌프 내부와 관로에서의 유압 회로 구성 요소 또는 맥동 감쇠기의 설계 파라미터에 따라 변하는 경향을 파악하였다. 유압 펌프의 맥동 감쇠 경향을 파악하기 위해 사이드블랜치 호스의 길이를 변화와 직경 변화에 따라 맥동 감쇠 특성을 비교하였고, 펌프 토출 유량의 흐름 방향을 기준으로 사이드블랜치 호스를 브랜치 방향과 임팩트 방향으로 구분하여 성능을 비교하였다. 시뮬레이션 프로그램과 실차 확인 시험을 통하여 사판식 액셜 피스톤 펌프의 맥동은 엔진 회전수와 작업 부하 압력에 영향을 받으며, 사이드브랜치 호스의 길이를 조절하여 펌프 맥동을 감쇠할 수 있음을 확인하였고, 사이드브랜치 호스의 직경은 본 연구에서 사용한 액셜피스톤 펌프의 경우에는 직경이 큰 것이 우수한 성능을 나타내지 못하는 등 반드시 맥동 감쇠 성능이 우수하지는 않다는 것을 알 수 있었고, 브랜치 호스의 장착 방향은 펌프의 유량 토출 흐름 방향에 브랜치 방향으로 장착하는 것이 펌프 맥동과 관로에서의 유량 맥동을 감쇠하는데 효과적이라는 것을 확인 하였다. The swash plate type axial piston pump have been commonly used in hydraulic systems for construction equipment, because of best efficient, low operating costs, high pressure level, The other side, they have a few demerits like that they have relatively high number of moving parts and more discharge pressure pulsation. Especially, the discharge pressure pulsation bring about vibrations and noise in hydraulic system components such as connecting pipe and control valves, so that these deteriorate the stability and accuracy of the system. Therefore, the hydraulic systems having the swash plate axial piston pump require the methods to reduce the discharge pressure pulsation. So, the purpose of this paper is pulsation-analysis of the swash plate type axial piston pump for excavator and the method of side branch hose application, which is used normally in construction equipments. In this paper, draw the mathematical modeling for pressure pulsation mechanism of the swash plate type axial piston pump for excavator, expression the flow pulsation in the pipelines by transfer matrix method, programmed simulation for pulsation by AMEsim software, and the reliability of that was verified by the comparison with the experimental results. And, fulfilled simulations of the performance evaluation of pulsation attenuation according to the variation of the side-branch design parameter, like as length, diameter, and connecting direction of the side branch hose, and then analyzed the results. As a result of this paper, suitable side branch hose length is controlled by engine speed and load pressure, the diameter of the side branch hose is not profit use bigger size than normal pipeline of this case and, branch type connection is effective than impact type to reduce the pulsation of the pump and pipelines.

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