압전 소자 THUNDER를 이용한 에너지 회수에 관한 연구

李英日 강원대학교 2006 국내석사

A target of this paper is to get some elementary experimental data on the energy harvesting using a piezoelectric material. A THUNDER series piezo material (TH7-R), which has been developed by NASA engineer is selected for this study. In order to provide a mechanical energy to the piezoelectric material, a mechanical motion vibrator and its driving electronics are designed. Using a simple PWM control, the excitation frequency of vibrating mechanical motion is varied. The generated electric power as a function of the excitation frequency is monitored and analyzed. This initial experiment shows a possible energy source using a piezoelectric material for the application to low-power consumed small electronic devices such as RFID, MEMS, and etc.

La_(x)Ce_(1-x)Co_(y)Cu_(1-y)O_(3-α) Perovskite 촉매의 선택적 CO산화반응 및 특성분석에 관한 연구

이영일 전북대학교 대학원 2008 국내석사

Proton-exchange membrane(PEM) fuel cell has many advantages such as no emission of pollutants, low operating temperature, long stack life, and soon. The ideal fuel for PEMFC is pure hydrogen with less than 10 ppm CO. In our study, Perovskite catalysts (LaxCe1-xCoyCu1-yO3-α, x=0.1, 0.3, 0.5, y=0.1, 0.3, 0.5) were synthesized by coprecipitation method at pH 7 and, pH 11, and its catalytic activity of CO oxidation and selective CO oxidation and characterization were investigated. The characteristics of perovskite catalysts were analyzed by N2 adsorption, X-ray diffraction (XRD), SEM, and O2-TPD. N2 adsorption results showed that the surface area decreased with increasing the amount of Cu substituted to Co location. The maximum surface area was 18.6m2/g of La0.5Ce0.5CoyCu1-yO3 calcined at 600℃. From the XRD results of LaCoO3 calcined at 600℃, 700℃, and 800℃, LaCoO3, La2O3 and Co3O4 crystal were observed together. This indicates that they exist in a single metal oxide form (La2O3, Co3O4) rather than a uniform LaCoO3 perovskite oxide form. The adsorptive behaviors of O2 were also studied using the thermal programmed desorption on the LaxCe1-xCoyCu1-yO3(x=0.9, 0.7, 0.5, y=0.9, 0.7, 0.5). The LaxCe1-xCoyCu1-yO3, O2 were desorpted at 150~720℃. Among the different α-oxygen species, the oxygen species evolved between 500℃ and 600℃, gave better catalytic performance for selective CO oxidation. The catalysts prepared at pH 7 showed better catalytic activity compare to that prepared at pH 11. The maximum CO conversion of 100% observed LaCoO3 synthesized at pH 7 and calcined 600℃. The substitution of Ce for La improved the catalytic activity for CO oxidation and best activity was observed for La0.5Ce0.5CoO3(230℃, 100%). In contrast to the enhancement effect by Ce substitution, the partial substitution of Cu for CO conversion decreased catalytic activities for CO oxidation. For selective CO oxidation, the best CO conversion was 95% at 230℃ for La0.5Ce0.5CoO3 synthesized at pH 7. After maximum CO conversion, LaxCe1-xCoO3 were rapidly decreased. But LaCoyCu1-yO3 were showed low CO conversion below 200℃ and maximum CO conversion was 86% at 230℃ for LaCo0.9Cu0.1O3. Also, LaxCe1-xCoyCu1-yO3 catalysts were tested for selective CO oxidation. CO, O2 conversion and O2 selectivity was evaluated, where CO and O2 conversion increased with increase temperature. In the case of Ce=0.1, CO conversion were decreased with increased the fraction of Cu-substitution. O2 selectivity was increased 73% at 200℃ and the decreased with further temperature increase. In the cases of Ce=0.3, 0.5, Maximum CO conversion of 83% and 95% were obtained at 260℃ for La0.7Ce0.3Co0.7Cu0.3O3 and La0.5Ce0.5Co0.7Cu0.3O3, respectively. O2 selectivity was decreased with an increase temperature. due to the reaction not only CO but also H2 and O2.

개량 메주 및 황련 뿌리 추출물 급여가 흰쥐의 지방질 대사에 미치는 영향

이영일 강원대학교 1997 국내석사

工業高等學校의 技能學習을 爲한 硏究 : NC 技能士 中心으로

이영일 慶熙大學校 1989 국내석사

初等學校 精神遲滯 兒童의 語彙發達

이영일 公州大學校 1999 국내석사

해양자율항체를 위한 퍼지관계곱 기반 지능형 충돌회피시스템

이영일 경상대학교 대학원 2005 국내박사

Increasing disasters at sea caused by large scaled vessels and heavy traffic density are highlighted to the cause of loss in human and finance as well as the cause of sea contamination. Such a disaster at sea is classified into "stranding and sinking" caused by the shortage of navigation skill, the uncertainty of chart, and the absence of weather report, and "collision with another vessel" caused by human's mistake which comes from low visibility and carelessness. The rate of "stranding and sinking" has been remarkably decreased by the advancement of navigation skill and meteorology since the late nineteenth century. On the other hand, the rate of "collision with another vessel" has been gradually increasing as a result of the rise in traffic density at sea. A study for reducing the collision-by automating the ability of domain experts such as the detection of obstacle, the computation of collision risk, and the decision making for obstacle clearance-brings about the development of collision avoidance system. Unlike collision avoidance system of other autonomous vehicles, the collision avoidance system for autonomous ship aims at not only deriving a reasonable and safe path to the goal but also keeping COLREGs (International Regulations for Preventing Collisions at Sea, 1972). Two kinds of collision avoidance techniques for autonomous ship have been studied to achieve the aim. One approach to the collision avoidance method is based on a knowledge-based system using knowledge and inference procedures to solve problems. The knowledge-based system embodies the collision avoidance technique by using COLREGs and user interface. The other approach to collision avoidance method is based on a heuristic search technique. It defines candidate successor set which consists of possible next nodes, then estimates all elements of candidate successors set with evaluation function in terms of safety and optimality, and selects lastly a reasonable node as next node to move. COLREGs describe rules applied to avoid collision only for one-to-one meeting case. Due to this fact, the knowledge-based system using COLREGs cannot take a reasonable action which takes into account the all approaching obstacles in many-vessels case. The simplified collision avoidance technique to one-to-one meeting case could cause the development of more dangerous situation because it cannot consider simultaneously many obstacles. The heuristic search technique, the other approach to collision avoidance method, has an advantage that the vessel could take into account all approaching obstacles. On the other hand, it has also a disadvantage that the vessel could take unreasonable action breaking COLREGs. Consequently, the most reasonable choice is to develop a new type collision avoidance system which takes only advantage of previous two approaches. In this paper we suggest a heuristic search technique for collision avoidance system of autonomous ship, which integrates the property of knowledge-based system: keeping the COLREGs. In order to derive a reasonable and safe path, we adopt the heuristic search based on the fuzzy relational products and the evaluation function representing heuristic information of domain experts. Also in order to observe the COLREGs, we adopt the rules of action to avoid collision stipulated in the COLREGs which are stored in knowledge base. The suggested collision avoidance system consists of two independent modules such as CSSM (Candidate Sector set Selection Module) and KBSM (Knowledge-Based System Module). The CSSM aims at selecting a candidate sector guaranteeing optimized collision avoidance out of component sectors of each candidate valley, which has five sub-components such as virtual obstacle module, relative grid module, polar histogram module, candidate valley module, and candidate sector module. KBSM makes the selection of one element keeping COLREGs out of candidate sector set generated in the CSSM. It is possible to apply COLREGs, which every seagoing vessel must keep, to the collision avoidance by adopting a knowledge-based system. A simulation is conducted with scenarios in view of optimality and safety so as to verify the performance of proposed collision avoidance system. Scenarios are composed of different encounter situations classified in COLREGs. The optimality of path derived by a search method can be measured by the cost difference of its path. In order to show the optimality of path generated by the proposed heuristic search technique performing collision avoidance, it is compared with the path generated by search algorithm. Also, keeping the rule of action to avoid collision stipulated in the COLREGs is used as measure of the safety of derived path. The analysis of simulation result shows that the search technique of proposed collision avoidance system has excellent performance with respect to optimality and safety of derived path.

퍼지기법을 이용한 자율수중운동체의 휴리스틱 항행 탐색

이영일 경상대학교 2001 국내석사

불평 보상에 따른 인지와 감정 반응이 소비자의 행동 의도 회복에 미치는 영향

이영일 서강대학교 2007 국내박사

한국 경제의 금융화에 대한 연구

이영일 경상대학교 대학원 2011 국내석사

The global economic crisis from 2007 to 2009 was the most serious crisis since the Great Depression of the 1930s, and gave the global economy a large shock. It evoked not only the problems of privatization of profits, which are accompanied by socialization of the losses, but also provoked debates on the cause and solution of the crisis. There are many theories regarding the cause of the crisis: one theory is based on failure of regulation, and attributes the cause to the lack of supervision in the financial markets. Another theory attributes the cause to financialization followed by an unstable expansion of finance. Yet another theory is based on Marxian crisis theory of falling rate of profit, which views decrease of the rate of profit since 1970s in major developed countries as the main cause of the crisis. This study focuses on whether financialization can explain the change in Korean economy. According to this theory, financial instability is a key factor that causes economic crisis in a system dominated by finance. Korean economy has rapidly developed thanks to a series of measures favorable to financialization that are based on the American financial model, including liberalization of the interest rate in 1991; and since 1997, restructuring of the financial industries; the open financial market; and the abolition of various regulations. Some data suggest that financialization gave rise to larger instability and less investments, and subsequently led to an overall recession in Korean economy. But contrary to these explanations, the amount of the corporate financing has been growing steadily and also, the decrease in investments by firms was caused not by financialization but by demand-side factors or/and the decline of profitabilities. Meanwhile, there are arguments that the Korean economy has to move from a bank-oriented system to the Anglo-American market-oriented system. But the collapse of the five biggest investment banks has debunked this belief. Empirical studies on the financialization of Korean economy with the indicators applied to the analyses of American economy show that the level of the financialization in Korea is insignificant. In terms of dominance of finance, except for the growth of the ratio of the volume of financial assets to tangible assets in non-financial corporate after 2000, there is no symptom that indicates financialization or the establishment of finance-led accumulation regime. The study was done using figures such as ratio of operating surplus of non-financial firms to financial firms, ratio of financial outflow to operating surplus in non-financial firms, non-financial to financial profitability in manufacturing firms, and debt ratio in non-financial firms. In terms of the change of the financial structure, although a trend of growing financial industries is indicated by some figures related to the scale of the stock market, share of institutional stock holders, and the ratio of the volume of stock to debt in non-financial firms, it is not enough to support that the system of Korean economy moved from a bank-base to a capital-market-base. This study points out the deficiencies of the financialization thesis, which suggests that the financial instability or financial fragility were the causes of the global economic crisis during 2007-2009 and argue that we have to consider the long-term decline of major developed countries since the 1970s in order to find an accurate solution. In addition, I argue that the thesis of finance-led accumulation regime cannot explain the characteristics of the change of Korean economy by using time-series analysis of finincialization including data during the 2007-2009 global economic crisis.

복합 네트워킹을 통한 서울시 소규모 문예회관 활성화 방안

이영일 한국예술종합학교 협동과정 2011 국내석사

지역 내 가장 중요한 문화기반시설 중 하나인 문예회관 운영의 효율성·효과성에 대한 의문은 오랜 시간동안 반복적으로 꾸준히 제기되어왔다. 그리고 이에 대한 해결책을 찾기 위하여 많은 연구들이 이어졌으며 그 내용은 크게 ‘운영주체/재정/프로그램/네트워킹’의 4가지 범주 안에서 구성된다. 필자는 이 중 ‘네트워킹’ 부문에 중점을 두어 서울시 자치구의 소규모 문예회관들이 ‘3단계 네트워크 시스템’의 장착을 통해 지역 문화예술계의 ‘살아숨쉬는 유기체’로 변화함으로써 지역주민들과 대면하고 소통하며 특성화할 수 있는 수요자적 관점의 문예회관 운영활성화 방안을 제시하고자 하였다. 이를 위하여 우선 문예회관의 개념과 관련한 제법규 및 선행연구 검토를 통하여 문예회관의 성격·법적 근거 등을 살펴보았으며, 아울러 서울시 자치구 27개 문예회관에 대한 현황을 2009년말 기준으로 정리·분석하여 ‘아트센터형-문예회관형-구민회관형’의 3가지로 구성되는 유형 분류를 실시하였다. 그리고 이러한 사전 검토내용을 기반으로 하여 서울시 소규모 문예회관 운영활성화를 위한 방안 세 가지(3단계 네트워크)를 다음과 같이 제시한다. 첫 번째는 문예회관과 문예회관 주변에 위치한 이해관계자(기획·운영 등 민간위원회, 회원·자원봉사조직, 지역 예술단체 및 문화예술동아리 등)들이 서로 관계를 맺는 기초 단위 네트워크로서의 ‘열린 조직/ 열린 운영 시스템’이다. 그리고 세부적으로 이러한 각각의 체계와 관련된 실제 사례들을 통하여 논지를 뒷받침하는 것과 더불어 오늘날 소규모 문예회관들이 직면하게 된 세 가지 운영원리(효율성·효과성·책임성)의 관점에서 이러한 운영체계의 장점 및 의의를 추가적으로 고찰한다. 두 번째는 이러한 기초 단위 네트워크가 권역 단위에서도 원활하고 효율적으로 기능할 수 있도록 해주는 ‘문화권역 내 문예회관 간 분·협업체계(권역 단위 네트워크)’이다. 이를 위하여 세부적으로 생활권에 기반한 ‘문화권역’의 개념을 우선 도출한 후 ‘아트센터형-문예회관형-구민회관형’에 이르는 3단계 유형 분류 체계에 맞추어, 문화권역 내 공동미션 수립 및 문예회관 간 세부 포지셔닝을 실시함으로써 분·협업체계를 구축한다는 내용을 담는다. 세 번째는 서울시 자치구 문예회관 간 네트워크(광역 단위 네트워크) 활성화로서, 그 내용으로는 우선 서울시에서 매년 실시하고 있는 《서울시 자치구 문화분야 인센티브사업 평가 제도》를 분석하고 그 개선안을 제시하여 개별 문예회관들로 하여금 벤치마킹 등을 통한 실용적 네트워크 형성에 대한 동기를 부여하고자 하는 것이 있다. 또한 문화권역 내 무임승차를 방지하고 개별 문예회관 고유역할의 성실한 수행으로 분·협업체계의 효과성을 극대화할 수 있도록 《서울시 자치구 문예회관 활동성과 평가》를 새로이 추가할 것을 제안하고 있다. 아울러 서울시 자치구 문예회관 간 네트워크 허브로서의 본래 기능을 원활하게 수행할 수 있도록 서울문화예술회관연합회의 기능 및 위상을 강화하는 내용을 제시한다. The question about the efficiency & effectiveness of managing a culture & art center which is one of the most important public cultural facilities has been proposed steadily and repeatedly for a long time. To solve this problem a lot of researches have been done and their prime contents were composed in four catagories-'Operating body / Finance / Program / Networking' The present writer, focusing on the 'networking' catagory, desired to suggest revitalization strategics of small-scale culture & art centers of autonomous districts in Seoul derived from consumer's perspective which convert local culture & art centers into "an alive organism" in local culture & art field by installing 'three-step network system' and make them contact, communicate with local residents and specialize. To accomplish this aim it was done searching culture & art centers' character and legal basis etc. by looking for all legislations and preceeded researches in relation to concept about them, and classifying them into three types(art center type-culture & art center type-public community center type) based on 27 culture & art centers' current status data of the end of the year 2009. On the basis of these examined contents in advance there are three revitalization strategics(three-step network system) of small-scale culture & art centers of autonomous districts in Seoul in this research. The first thing is the 'open organization system/ open operation system' as a basic area unit network which relates a culture & art center to stakeholders(planning/operating civil committee, membership/volunteer group and local art groups/culture & art clubs etc.) around it each other. In detail actual cases associated with the open system sustain the argument and the advantage/meaning of this system is considered from the viewpoint of three management principles(efficiency, effectiveness, accountability) which small-scale culture & art centers face with today. The second thing is the 'specialization/cooperation system' among culture & art centers in a cultural area(a regional area unit network) to make a basic area unit network operate smoothly and efficiently in a wide area equally. For this purpose in detail it is needed to draw concept about the 'cultural area' based on the 'life zone' in advance, to establish the common mission and detail positioning among culture & art centers in a cultural area and to forge the specialization/cooperation system by the three-step classification(art center type-culture & art center type-public community center type). The last thing is activating the network among culture & art centers of autonomous districts in Seoul(a wide area unit network). It contains first analyzing 《The valuation system of the incentive business in cultural field of autonomous districts in Seoul》 and suggesting a reform plan by which each culture & art center desires to form a practical network through benchmarking etc.. It contains also proposing to add newly 《The measurement of the performance of culture & art centers of autonomous districts in Seoul》 for preventing a free ride in a cultural area, sincere accomplishing each own role of culture & art centers and maximizing effectiveness of the specialization/cooperation system. And it contains finally reinforcing the function and status of the Association of Arts Centers in Seoul(AACS) to carry out its indigenous function smoothly as a network-hub among culture & art centers of autonomous districts in Seoul.