變斷面角柱の空氣力低減メカニズムに關する硏究

김용철 東京大學 2009 해외박사

의미중심 영어 읽기지도에 관한 연구

김용철 西原大學校 大學院 1997 국내석사

保健所 機能 活性化를 위한 資源配分의 適切性 評價

김용철 조선대학교 환경보건대학원 1998 국내석사

Under the slogan of "building up the welfare state", government is giving the priority to health care field in order to give the people health care service equitable and effectively, public sector, which is has been treated negligently under the principle of free market, should be strengthened. Therefore Health Center, which is the care of public sector and the first-line administrative organization for maintaining and improving the health of a community, should play a major role in achieving the goal-"Health For All". In this context this study has been made to analyze and examine the problems in the organization and functions of Health Centers and to suggest the improvement measures. Major findings can be summarized as follows : 1. the order of priority in health center activities is varied according to personal position and role. 2. The historical development process of Health centers in selective countries are varied according to their political, economic and social-cultural factors. Nowadays Health Centers of many countries except for few countries tend to provide the integrated health care services. 3. At present, Health Center includes many problems like the inefficient, weak organizations and management system, the poor budget allocation owing to the low order of priority, the shortage of public health personnels, the absoluteness and scarcity of equipments, facilities and the lack of new public health works. 4. The budget and personnel in Health Center is not distributed appropriately according to the order of priority. In order to solve problems above mentioned and fulfill the health needs of the people effectively, following measures should be taken. 1. The strengthening of organizational system for the performance of the integrated comprehensive public health service. 2. The unification of control and supervision system for the efficiency of Health Center activities. 3. The increase of public health personnel, the reinforcement of equipments, facilities, and the sufficient budget allocation 4. The improvement of remuneration and promotion system for the advancement of manpower productivity. 5. The encouragement of community participation in Health Center activities. 6. Reinforcement of the close connection with civil organization. 7. Security of competent personnels and specialties. 8. Leadership of the head of Health Center. 9. Redesign of organization and job in Health Center. Public health programs are finance and the broad organizational patterns for their implementation are determined governmental policy decisions. When may problems above mentioning is solved, Health Center fulfills its function properly in the health care delivery system.

지방공기업 운영에 관한 연구 : 신설 지방공사를 중심으로

김용철 경남대학교 경영대학원 2011 국내석사

우리나라 지방공기업은 1969년 지방공기업법이 제정된 이후, 1970년 7개 사업에서 2000년 약 300개 사업으로 괄목할 만큼 증가하였고, 2000년 결산기준으로 약48조 4,759억 원의 자산을 보유하였다. 그리고 2009년 현재 약 119조 5,030억 원의 자산을 보유하고 있다. 이러한 지방공기업의 외형적 성장으로 인한 방만한 경영으로 내실을 기하지 못하고 비효율적인 운영으로 오히려 지역주민들에게 부담을 가중시키는 결과를 초래하고 있다. 현행 지방공기업의 제도는 관료제적 운영방식에서 크게 탈피하고 있지 못하여 지방공기업의 경영형태에 따라 상이한 통제가 이루어짐으로써 기업으로서의 자율성과 책임경영체제를 구축하고 있지 못하고 있다. 특히 신설지방공기업에 대한 사후관리의 부재로 신설지방공기업들의 부실 경영으로 인한 어려움은 가중되고 있다. 2008년 이후 만든 지방공기업 16곳을 대상으로 한 신설 지방공기업 경영상태 전수조사에서 행정안전부는 설립타당성 및 사업운영 적절성, 관련법령 및 지침 준수 여부, 기타 운영상 문제점 등을 점검한 결과 신설 지방공기업 16곳 모두 관련 기준을 어긴 채운영되거나 부적절하게 사업을 추진하고 있는 것으로 나타났다. 2008년 이후 전국에 신설된 지방공기업 중 지방공사 평택시, 양평군, 안산시, 함안군 등 4개의 지방공사와 공단을 대상으로 나타난 문제점은 첫째, 기획·설립단계의 문제로는 설립부문의 문제, 사업 및 활동영역 부문의 문제가 있으며, 둘째, 관리·운영단계의 문제, 셋째, 평가·환류단계의 문제가 발생하였다. 이러한 각 단계별의 문제를 해결하기 위해서는 첫째, 지방공기업 설립타당성 검토 결과의 적용을 강화하기 위한 방안으로 지방공기업법 시행령에 규정된 최소요건만 충족하면 조달청 공개입찰을 통한 무작위 추첨식 전문기관의 선정방식 등의 재고와 500억 이상의 신규 사업의 경우 외부전문기관의 사업타당성 조사의 의무화, 타당성조사 결과에 대해 투자심의위원회 심의 및 이사회 의결을 거치도록 개선 등이 이루어져야 한다. 그리고 지방공기업법 적용대상의 명확성을 위해 사업의 성격 및 공공성·수익성의 비중에 따라 사업방식이 결정되어야 한다. 둘째, 지방공기업의 자율성 행사를 위해 이사회 구성 중 당연직 이사를 폐지하거나 당연직 이사인 현직 공무원들의 비율을 최소화하고 가급적 민간부문의 전문성을 보유하고 있는 이사들을 적극적으로 확대하는 등 이사회 구성의 재검토가 이루어져야 한다. 또한 사장추천위원회의 구성 및 운영개선으로 사장추천위원회의 구성을 중립적인 인사로 구성할 수 있도록 조례로 명문화하고, 사장추천위원회의 구성방식을 경영평가 시 하나의 평가지표로 활용하는 방안을 고려해야 하며, 조직 및 정원변경 인가 제도를 폐지하여야 한다. 그리고 지방공기업 운영에는 무엇보다 경영마인드가 전제되어야 한다는 점에서 공무원뿐만 아니라 외부 전문가도 채용이 가능하도록 개정되어야 할 것이다. 따라서 지방공사 사장의 선정 시 전문성과 자질을 갖춘 공정하고 객관적인 선정이 이루어져야 하며, 지방자치단체장과 지방공사 사장의 임기를 동일하게 하여 지역 발전에 동참할 수 있는 방안이 필요하다. 그리고 효율적인 경영을 위한 업무 매뉴얼을 지방자치단체 및 지방공기업의 실정에 맞도록 개발되어야 한다. 셋째, 경영평가전담기관의 독립성과 법적 위상의 확보와 기관의 특성을 고려한 평가지표를 적용하고 평가기관은 피평가기관인 지방공기업들에 대하여 효율적인 성과주의 경영체제 구축을 위한 방향 및 성공사례를 제시해주고 그 수단의 선택은 기관의 특성, 기관 간 비교 등을 통해 피평가기관이 판단하도록 해야 한다. Since the local public enterprise was established in 1969, originally consisting of seven major businesses, it has achieved phenomenal development. In 2000, the local public enterprise expanded its own business to about 400 major businesses, and they had capital assets worth around 48.5 trillion won. In 2009, their capital assets increased to 119.5 trillion won. However, despite its remarkable growth, the management became reckless and internal instability increased. As a result, residents felt the burden of the local enterprise's inefficient management. Because of the local public enterprises' bureaucratic system, the autonomy and responsibility based management system of the local public enterprises has been hard to establish. For the newly established local public enterprises, there is an absence of accountability for management and, as a result of this, the management becomes poor and it causes more problems. In the state census held by the Public Administration and Security, which established standards regarding the feasibility of business operations, adequacy, compliance with applicable laws and guidelines, and other operational issues, the 16 newly established local public enterprises since 2008 failed to meet the relevant standards or improperly promoted business practices. Since 2008, problems of newly established local public enterprises across the country, especially Pyeongtaek, Yangpyeong, Ansan, and Haman's, reveal issues in several phases: 1) the problem of planning and establishment phase, 2) the problem of management and operational phase 3) the problem of evaluation and reflux phase. In order to solve these problems, first of all, for the local public enterprises' establishment phase, if the minimum requirements of the local public enterprise's law are fulfilled, a random draw of professional enterprise as a method of selection through the Public Procurement Service's open bidding has to be reconsidered. Also, in case of more than 500 billion won businesses, the evaluation of the validity of the business by external professional enterprises has to be mandatory and the result of the evaluation of the business should be passed through the resolution of Investments Board and the Board of directors. For the clarity of the eligibility of the local public enterprise's law, the method of the business has to be decided through the nature, publicness and profitability of the business. Second, for the autonomy of the local public enterprise, the Board of directors must be reconstructed. For example, the current method of appointment by job title, including government officials, should be abolished. Instead, there needs to be an increase in appointments given to those in the private-sector. Also, to maintain neutrality, the composition of the CEO Recommendation Committee must be expressly stipulated in the text by ordinance. For an evaluation index of evaluation of management, the composition of the CEO Recommendation Committee has to be useful, and the system of the modification of the organization and the prescribed number of employees must be abolished. Because the management of the local public enterprise is based upon a premise of management expertise, outside experts have to be hired as government officials. Therefore, in case of the selection of a director of a local public enterprise, the speciality and ability as an expert have to be considered and it has to be fair and objective. Also, municipal mayors and corporate presidents should share closely related terms in order to effectively work together. The work manual should be amended by the corporate president to reflect these changes. Third, the management assessment phase should be conducted by an autonomous agency that specializes in the relevant field. This agency should be a legal entity. The agency should provide case works of successful business cases in order to serve as examples. These examples will teach local enterprises efficient performance-based management styles and serve as a benchmark for companies.

ZnO를 이용한 압전형 마이크로폰 설계 및 제작 공정에 대한 연구

김용철 포항공과대학교 2003 국내석사

自願奉仕 活性化 方案에 관한 硏究

김용철 한양대학교 행정대학원 1996 국내석사

CFT 기둥과 Flat Plate 슬래브 접합부 거동에 관한 유한요소 해석

김용철 고려대학교 대학원 2004 국내석사

1990년대 이후로 고층 건물의 건설은 크게 증가되었다. 이러한 고층 건물에 있어서 층고 문제는 건물의 경제성을 결정짓는 중요한 요소로 인식되고 있다. 저자를 포함한 몇몇 연구자들은 건물의 층고를 줄일 수 있는 여러 시스템에 대해 연구한 결과 현재 고층 건물에서 효과적으로 적용되고 있는 CFT 기둥과 Flat Plate 슬래브가 층고를 낮출 수 있는 구조 시스템이라는 결론을 얻었다. 이들 각 부재에 대한 성능과 사용성은 이미 검증이 끝난 상태이고 우수한 구조 부재로 인식되고 있으나, 이들 접합부에 대한 연구는 해외의 몇몇 연구가 있었을 뿐 국내에는 전무한 상태이다. 따라서 본 논문에서는 CFT기둥과 Flat Plate 슬래브로 이루어진 라멘구조에 대해 적용 가능한 접합부 디테일을 제안함과 동시에 기존 설계 방법에 의해 설계가 불가능한 부분에 대해서는 유한요소해석을 통해 응력집중, 힘의 흐름 그리고 강관의 면외변형등 접합부의 변형 특성을 고려해 접합부 설계식을 제안하도록 하겠다. 유한요소해석결과 다음과 같은 결론을 얻었다. 1. 최종 접합부 디테일로 한 방향으로는 철근정착형 접합부를, 다른 한 방향으로는 철근관통형 접합부를 사용한다. 2. 기존 설계식에 의해 설계가 불가능한 부분에 대해 응력집중과 면외변형 등 접합부의 변형 특성을 조사하기 위해 유한요소해석을 수행하였다. 그 결과 접합부 강도는 강관 폭 (b_(c)), 강관 두께 (t_(c)), 플레이트 길이 (l_(p)), 플레이트 두께 (t_(p)), 항복비 (_(c)f_(y)/_(p)f_(y))에는 비례하지만, 연단거리 (l_(s))와는 반비례함을 알 수 있었다. 3. 접합부 설계식을 제안함에 있어서 접합부의 극한상태를 기존 논문과 유사한 디테일을 가진 실험 결과를 고려하여 강관의 면외변형이 5mm일 때로 가정하였다. 접합부 강도에 영향을 주는 변수로는 강관 폭 (b_(c)), 강관 두께 (t_(c)), 플레이트 길이 (l_(p)), 플레이트 두께 (t_(p)), 강관과 플레이트이 항복비 (_(c)f_(y)/_(p)f_(y)), 그리고 연단거리(l_(s))로 가정하여 철근정착부의 강관과 플레이트를 중심으로 유한요소해석을 수행한 결과 다음과 같은 접합부 설계식을 얻었다. ◁수식삽입▷(원문을 참조하세요) Since 1990s, the construction of tall buildings has been increased greatly. For the tall buildings, the story height is an important factor to accomplish economic buildings. Several researchers including authors have studied for the structural systems reducing a story height of the buildings. A structural system consisting of concrete filled tube column and flat plate slab is one of the story reducing structural systems, in which each element has been used as an efficient component for tall buildings. However, the structural behaviour of the connection has not been explored clearly. Therefore, the finite element analysis method is used to verify the stress concentration, load flow and excessive deformation on the connection. Three types of connection detail are compared and the better one is obtained. The design equation for the adopted connection detail is also proposed by the FEM analysis. The following conclusions were attained. 1. The final connection detail is shown below. The reinforcing bar anchored plate was used for one direction, and the through reinforcing bar was used for the other. 2. Finite element analyses was carried out to verify the stress transfer of the reinforcing bar anchored portion. From the results, we discover that design strength is proportional to the width and the thickness of the column tube and to the length and thickness of the plate, and the yield strength ratio. However, it is inversely proportional to the edge distance since the tensile force is directly transferred to the column web. 3. In calculating the yield strength, it is assumed that the limit state of connection is reached when the out-of-plane deformation of the column equals to 5mm. The variables that can influence the yield strength of the connection are assumed as the width and thickness of column, the length and thickness of plate, and the yield strength ratio of both column and plate. Using the results from the finite element analyses, we propose a design strength through the multiple linear regression analysis: ◁수식삽입▷(원문을 참조하세요)

菱田春草の作品世界に關する硏究

김용철 東京大學 大學院 1999 해외박사

강섬유 인장강도 및 형상비에 따른 고강도 콘크리트의 휨 특성

김용철 忠南大學校 産業大學院 2018 국내석사

Concrete, in general, has exceptional resistance to compression but is vulnerable to bending, which causes microcracks during flexural loading and leads to brittle fracture. To improve the brittle fracture behavior of concrete and mitigate the complex details of the components, studies on steel fiber reinforced concrete(SFRC) have been actively conducted in Korea and abroad. Fibers dispersed in concrete control the growth of local cracks during flexural loading through the crosslinking action and improve the tensile resistance of the concrete. Moreover, when steel fiber is mixed with concrete, the ductility, fatigue resistance, impact resistance, and shear strength of concrete improves. Therefore, this study evaluates the mechanical properties, tensile strength, and aspect ratio of high strength SFRC depending on the fiber content. Based on the results of this evaluation, the possibility of the practical use of SFRC in high strength concrete will be discussed. To evaluate the effect of steel fiber properties on the compressive characteristics of high strength SFRC, columnar specimens of size Φ150×300mm were prepared for each formulation. The test was conducted using a universal test machine(UTM) with a capacity of 2,000kN according to KS F 2405 by using a load control method (0.5MPa/s). Moreover, concrete gauges were attached to four sides of the specimen to measure the transverse and longitudinal strains. Subsequently, to evaluate the bending characteristics, a 150×150×550mm square test specimen was prepared according to EN-14651 standard. A 3-mm-deep and 25-mm-thick notch was formed to measure the crack mouth opening displacement(CMOD), the size of the crack of the bottom center, 24h before the test. The flexural characteristics were evaluated using a universal material testing machine with a capacity of 200kN. Because EN-14651 proposes the force speed based on the CMOD increase rate, in this study, the experiment was conducted at a pulling speed of 0.3mm/min. The CMOD was also measured using a linear displacement meter. As a result of the evaluation of the unconfined concrete owing to the incorporation of steel fiber, the slump flow value decreased as the fiber content increased, and the difference in fiber aspect ratio was not significant. As a result of the air content measurement, the amount of air increased in common with the previous SFRC study owing to the incorporation of the fibers, which is considered to be due to the formation of voids in the steel fiber within the composite. As a result of evaluating compressive characteristics, relatively soft fracture patterns were exhibited owing to the fiber incorporation. It is considered that brittle fracture does not occur because the range of the cross-linking action of the fibers is expanded, thereby suppressing the force of expansion due to the compressive force. Subsequently, the Poisson's ratio was also observed to be slightly increased owing to the incorporation of the steel fiber. This is also considered to be the result of the fact that the steel fibers dispersed in the concrete retain the energy until the final failure as the transverse expansion through the cross-linking between the matrix increases. In the research by Choi and Se-jin, the same result, which demonstrates that the Poisson's ratio increases owing to the incorporation of steel fiber, has been reported. Further, the compressive strength and the modulus of elasticity demonstrated irregular changes with the incorporation of the steel fiber. It is believed that the steel fiber incorporation does not affect the compressive properties of the high strength SFRC significantly. Finally, bending tests were conducted in accordance with EN-14651. The experimental results indicate that the flexural properties of the steel fiber improved owing to the increase in the tensile strength, aspect ratio, and fiber content. In particular, the flexural behavior of the high-tensile-strength fibers improved, and the flexural stress also increased as the CMOD increased after the initial cracking, even at a low incorporation rate of 0.5%. Based on the bending test result, the results of the bending performance test proposed in the standard of fib model code 2010 indicated that only fiber incorporation at a tensile strength of 1,600MPa satisfies the criteria proposed in the standard. Therefore, it is considered that upon using steel fibers with high tensile strength, exceptional bending properties can be obtained even at a low mixing ratio, and the workability can be improved significantly by lowering the fiber content.

4호선 전기동차 LED 안정기 고장 분석에 관한 연구

김용철 서울과학기술대학교 2018 국내석사

전 세계적으로 저 탄소 녹생성장 및 녹색에너지 정책과 지속적인 국제 유가 상승으로 인해 전 세계적으로 에너지 제한제도를 실시하고 있다. 이에 따라 친환경 고효율 에너지 사용의 관심이 증대되고 있다. 특히, LED(Light Emitting Diode) 기술이 발전함에 따라 낮은 소비전력으로도 기존의 등기구보다 더 뛰어난 성능을 갖춘 LED 등기구를 다양한 분야에 적용하고 있는 움직임이 활발히 일어나고 있다. 최근 에너지 절감에 따른 LED 등기구의 수요가 증가하면서 기존에 전기동차 객실 내 설치되어 있는 형광등 기구를 이러한 추세에 맞추어 2010년부터 AC220V와 DC100V 객실등을 LED 조명으로 순차적 변경 적용 확대하고 있다. 그러나 최근 LED 안정기 불량이 증가하고 있는 추세이며, 특히 AC220V용 안정기 고장이 DC100V용 안정기 대비 2.3배 많은 것으로 코레일 수도권서부본부 시흥차량사업소 2016년도 불량품 검토 결과 확인되었다. 특히, 2011~2015년도에 제작된 AC220V 안정기가 절연파괴 되는 불량이 높음을 알 수 있다. 본 연구에서는 2016년 9월부터 2016년 12월까지 취합된 AC220V의 LED안정기 불량을 분석하고자 한다. 특히, AC220V 안정기에서는 주요 불량시료 동작 및 외형 확인하여 절연파괴에 대한 불량 원인을 고찰하고, 고장 분석을 통하여 주요 고장 원인인 기본 절연거리 Margin 부족과 고압 Switching 부위의 불규칙적인 액형 에폭시 몰딩의 계면 절연파괴에 의한 방전 누적 트래킹에 기인한 고장 예방을 위한 설계가 충분히 고려되었는가를 확인하며, 아울러 안정기 내부에 에폭시 몰딩 재질에 대한 성분 분석을 통하여 부식 가속 원인을 확인하고자 한다. 본 연구를 통해 얻어진 다양한 실험값들은 앞으로 AC220V LED안정기 제품을 개발 및 생산하는 제조업체에 안전에 대한 기본적인 가이드라인을 제시하고 기술개발을 통한 설계와 시공하는데 많은 활용이 될 것으로 사료된다. 또한 차후 코레일 관련 안전 기준들이 보완되고 안전 규격을 제정하는데 도움이 되고자 한다. 이로써 LED 안정기 고장으로 인한 피해가 최소화되어 내 ․ 외부 고객 만족도를 향상시키고, 최적의 차량정비운영 환경이 구축되어 전기동차의 유지보수 품질이 향상되기를 기대한다. Globally, energy-constrained systems are being implemented globally due to low carbon green generation and green energy policies and steady increases in international oil prices. As a result, interest in using environmentally friendly, highly efficient energy is increasing. In particular, with the development of LED (Light Emitting Diode) technology, there have been active moves to apply LED luminaires that have better performance than conventional luminaire to various fields with low power consumption. Recently, as the demand for LED luminaire has increased due to energy saving, the fluorescent lamp equipment installed in the electric room has been adapted to this trend and the AC220V and DC100V rooms have been gradually changed and applied to LED lighting from 2010. However, the defective LED ballast has been increasing recently. Especially, the defective ballast for AC220V is 2.3 times more than the ballast for DC100V. In particular, it can be seen that the AC220V ballast manufactured in the 2011 ~ 2015 period has a high degree of defective insulation. In this study, we analyze the defective LED ballasts of AC220V from September, 2016 to December, 2016. Especially, in the AC220V ballast, we investigated the cause of the failure of the insulation failure by examining the operation of the main failure sample and the appearance of the defective sample. Through the analysis of the failure, the basic insulation distance, the shortage of Margin and the interfacial insulation breakdown of the irregular liquid epoxy molding In addition, we investigate the causes of accelerated corrosion by analyzing the composition of the epoxy molding material inside the ballast. Various experimental data obtained through this study will be used for the design and construction of technology through the development of the AC220V LED ballast and the basic guideline for safety. In addition, KORAIL-related safety standards will be supplemented and safety standards will be formulated. This minimizes the damage caused by LED ballast failure. We expect to improve the external customer satisfaction and improve the maintenance quality of the electric vehicle by establishing the optimum vehicle maintenance operating environment.