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.

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

이영일 강원대학교 1997 국내석사

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.

율곡 이이와 하곡 정제두의 신체관 비교 연구

이영일 단국대학교 대학원 1999 국내석사

부동산 개발금융의 신용위험 관리 방안 연구

이영일 단국대학교 대학원 2009 국내석사

2002년 이후 부동산 경기 활황으로 급등하는 주택가격과 투기를 억제하기 위해 정부가 발표한 2004년 10.29대책과 2005년 8.31대책은 국내 부동산 시장을 침체시켰고, 또한 최근 정부의 부동산 안정대책 추진 및 은행의 리스크관리 강화 등으로 부동산 PF의 증가세가 둔화되고 있으며, 이로 인해 지방 중소건설업체의 부동산 개발사업이 위축되고 있다. 이에 본 논문은 부동산 개발금융(프로젝트 파이낸싱)의 개념과 개발금융의 변화과정을 파악하고 더불어 다양한 부동산 개발의 금융기법 및 제도를 연구하고, 그에 따른 위험인자와 근본적인 신용위험 관리 방안을 연구하는데 목적을 두고 있다. 기존의 개발금융은 금융기관들이 주로 대출 형식으로 자금을 공급하던 제한적인 금융거래였지만, 프로젝트 파이낸싱 시장이 확대되면서 자금수요가 늘어나자 은행에 의해 제한된 자금공급만으로는 자금 수요를 충족할 수 없게 되었다. 이에 금융기관을 통한 간접금융 방식 외에 장기간에 걸쳐 상환이 가능한 채권을 발행하거나, 자본시장에서의 주식 발행을 통해 안정적인 자금흐름을 확보하는 직접금융 방식의 자금조달이 나타나게 되었다. 그 방법으로 자산유동화제도로 자금을 조달하고자 하는 자산보유자가 그 자산을 담보로 하여 증권을 발행하는 제도이다. 부동산 PF 유동화는 2004년부터 본격화되기 시작했다. 프로젝트 파이낸싱과 자산유동화를 결합시킴으로써 건설업체는 경기 침체기에도 사업자금을 보다 다양하게 조달할 수 있으며, 금융기관도 대출 자금을 사업의 종료 이전에 신속히 회수할 수 있다. 또한 위험에 대한 안전장치가 강화되기 때문에 프로젝트 파이낸싱과 자산유동화를 결합하는 경우, 기존의 프로젝트 파이낸싱보다 사업참여자들 모두에게 유리한 제도이다. 최근 건설경기 침체로 인한 미분양물량 증가로 시행사의 부도가 이어지고 시공사의 우발채무가 증가하면서 부동산 PF 대출에 대한 금융권의 여신비율의 강화되었으며, 대출금리도 상승하였다. 또한 부동산 프로젝트 파이낸싱 ABS 및 ABCP의 직접조달방식의 자산유동화증권(회사채)의 신뢰도가 하락하여 담보가치가 훼손되고 신용위험이 악화되어 유동성 위험으로 발전할 수 있는 위험요인을 가지고 있다. 부동산 PF의 리스크 헷지 방안으로 시공사의 신용공여를 통한 신용보강을 더욱 강화하고, 유동화증권의 수요확보를 위해 헤지펀드와 같은 해외 민간투자자본을 도입함으로써 유동성 악화를 방지할 수 있을 것으로 보인다. 또한 보험회사 등의 보험증권업무의 확대를 통하여 자산유동화 증권의 신용보강기관의 다양화를 추진해야 할 것이다. 더불어 국내금융권에 한정된 자금조달 뿐만 아니라 해외 자산유동화 시장을 통해 자금조달수단의 다변화를 통해 유동성 문제 및 프로젝트 파이낸싱의 신용위험을 해결해야 할 것이다. 결론적으로 부동산 개발금융의 신용위험을 극복하기 위해 부동산 금융 전문가를 육성하고 제도적인 뒷받침 뿐만 아니라 가장 중요한 자금조달에 있어, 유동화 등 부동산 개발금융구조의 다양화 등 리스크 헷지 방안의 다양한 제도적 뒷받침과 연구가 있어야 한다.

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.

蒐集 貝母의 遺傳變異探索과 優良系統의 器內繁殖

이영일 韓京大學校 産業大學院 2004 국내석사

國內 및 中國에서 收集한 貝母 遺傳資源의 遺傳變異分析 및 優良系統으로부터 器內繁殖 條件을 糾明하고자 PCR fingerprinting 分析과 callus 및 multishoot 誘導條件을 검토한 結果를 要約하면 다음과 같다. 1. 수집한 貝母 유전자원은 총 19계통이며, 乾物重, 種球莖, 種球帳 및 鱗片數 등을 조사한 결과 種球의 크기에서 收集種 간에 다양한 變異를 보였으며, 특히 乾物重에서 範圍는 0.01g에서 0.6g로 상당한 차이를 보였다. 2. 수집한 19系統의 遺傳的 多樣性 分析을 위해 사용된 12개의 URP primer에서 얻어진 多形性 밴드수는 95개로 cluster分析을 통해 遺傳的 類似度를 측정한 결과, 수집계통간 類似度가 가장 큰 값은 0.88이었고, 가장 작은 값은 0.57로서, 遺傳的 類似度 0.75값에서 크게 2개의 그룹으로 나누어졌다. 그중 한 그룹은 平貝母 group, 다른 한 그룹은 切貝母 group으로 잘 분리되는 경향을 보였다. 3. 器內繁殖을 목적으로 우량종구를 선발하여 callus 誘導 條件을 조사한 결과 MS 기본배지에 1ppm 2, 4-D와 0.5ppm Kinetin함유된 처리구에서 가장 양호하였으며, multishoot 誘導 條件을 조사한 결과 MS기본배지에 1ppm NAA과 0.5ppm Kinetin이 함유된 배지에서 가장 양호한 결과를 얻었다. 4. 이상의 결과로 국내 貝母 復原事業을 위해서 수집된 유전자원의 유전적 多樣性의 潛在能力과 優良貝母系統의 育種 program에 많은 도움을 줄 것으로 생각된다. These studies were conducted PCR-fingerprinting analysis and in vitro propagation using superior lines to investigate genetic relationship among collected lines between Korea and China, induce callus and multishoot in MS medium containing various plant hormons using selected lines. These results were summarized as follow: 1. Total 19 lines collected from Korea and China were evaluate for selection of promising lines. These lines were investigate as the characteristics the dry weight of root, root length, root size for evaluation. Root size was different and dry weight of root was showed from 0.01g to 0.6g. 2. A total of 95 polymorphic bands were generated on agarose gel by 12 primers of repeated sequence, grouped by cluster analysis using sample matching coefficients of similarity. Among the collected lines, the minimum genetic distance value was 0.88, maximum genetic distance value was 0.57. Collected lines could be divided into 2 groups at below about 0.75 levels of distance. 3. To induce callus and multishoot in MS medium containing various plant hormons using selected lines, optimal condition of callus formation was obtained in MS medium supplemented with 1ppm 2, 4-D and 0.5ppm Kinetin. Also optimal condition of multishoot formation was obtained in MS medium supplemented with 1ppm NAA and 0.5ppm Kinetin. These results will help to realize more potential of genetic diversity and breeding program in Fritillaria thungergii.

퍼지기법을 이용한 자율수중운동체의 휴리스틱 항행 탐색

이영일 경상대학교 2001 국내석사