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This paper, when we are trying to solve in the natural cross ventilation arrangement the unfavorable imperssion generated because of the serious indoor pollution and high temperature and humidity, aims to seek for the condition to raise the wind velocity inside buildings and which stream of air turns to advantage of the ventilation arrangement. And also it persents the condition resulted in the wind as well as the opening and it stands a certain conception on the pattern of a stream of air inside buildings, as the indoor air current of those condition studied. In order to attain the above-mentioned purpose the following experiments on the model wind tunnel execute. 1. Experiment on the indoor wind speed and stream of air in accordance with the outside wind speed and the length of a room. 2. Experiment on the indoor air speed and stream of air in accordance with the direction of the wind and the place of the opening. 3. Experiment on the indoor wind speed and stream of air in accordance with the size of the opening. 4. Experiment on the indoor wind speed and stream of air in accordance with the place of before and behind the opening. 5. Experiment on the indoor wind speed and stream of air in accordance with the rate of floorside of a room. The conclusion gained by the experiment 1-5 the following are. 1. the outside speed and the indoor wind speed are proportional. But the influx wind speed and the wind speed of the mainstream are different size-rate front and back opening and they are proportioned directly and the other parts of indoors are different in the places of the opening as well as the direction of the wind. In other words, when the mainstream proceed straightly from influx opening to outflow opening, the mainstream is influenecd but the areas have a weak influence. But in the places of the wind and the opening raised rotation air stream the influence has a equal influence in the shade. 2. If the length of a room in lengthened, the average wind speed in the shade is droped little by little and the spread of the wind speed in the backside is raised better than the front side. 3. The direction of the wind in the building, against the ventilation is an incline of 65-70˚: but it is suitable an incline of 90˚ in the side ventilation and if the indoor wind speed and the distribution of the wind speed even. 4. The position of the influx opening in order to be profitable to the wind speed in the shade and stream of air, is desirable an lee-ward side. The position of the outflow opening is less important than the influx opening for the stream of air and the wind speed in the shade, but it has an influence of the direction of the indoor air current. 5. In order to raise the indoor wind speed, it is certain that the front and back opening must be increased at the same time, if one of them increase, it is uncertain. Namely under the situation on m=l, if the front opening increases, the indoor wind speed decrease and if the back opening, it decrease little by little. While, under the situation on m<l, the increase of the back opening increases rapidly the indoor wind speed until m=l, on contrary the increase of the front opening decreases little by little. And also, under the state on m>1, the increase of the back opening increases the indoor wind speed little by little and the increase of the front opening increases rapidly until m= 1. 6. In case of m>1, the wind speed of the influx opening can be raised about one point five times than the outside wind speed. m=l, it raises about one point two five times than the out side wind speed. m<1, it decreases. The relation of the opening rate and the influx wind speed gained by the above experiment wase m=0.226_(e)^(1 66v) 7. If the rate on the length of a room increases, the average of the wind speed in the shade is raised at the rate of the area on the mainstream from one point. And it almost shaved no change below one point.
분광광도법을 이용하여 trans -〔 Cr (tmd)₂FX 〕^+ (X=F^-, Cl^-) 착이온의 압력과 온도변화에 따른 수화반응의 속도상수를 구하였다. 속도상수의 변화로부터 열역학적 파라미터를 구하고 이 값을 이용하여 두 착물의 반응메카니즘을 규명하였다. 수화반응의 속도는 온도와 압력이 증가함에 따라 증가하였으며, 이 반응의 활성화부피는 trans -〔 Cr (tmd)₂F₂〕^+ 착이온의 경우는 -3∼-2cm³mol^-1 이고, trans -〔 Cr (tmd)₂ FCl〕^+ 착이온의 경우는 -8∼-7cm³mol^-1 이었다. 이 값들로 보아 trans -〔 Cr (tmd)₂F₂〕^+ 의 수화반응은 교환 해리메카니즘(Id)으로 진행되고 trans -〔 Cr (tmd)₂FCl 〕^+ 의 수화반응은 해리메카니즘(D)으로 진행되는 것으로 생각된다. The rate for the aquation of traps-[Cr(tmd)₂FX]^+ (X=F^-Cl) ion in aqueous acidic solution had been measured by spectrophotometric method at various temperatures and pressures. The rate constants are increased with increasing temperatures and pressures. Activation volumes have all negative values and lie in the limited range -3 ∼ -2cm³ mol^-1 for trans-[Cr(tmd)₂F₂]^+ and -8 ∼ -7cm³mol^-1 for traps-[Cr(tmd )₂FCl]^+ion. From the above results, we may deduce that the mechanism for the aquation of traps-[Cr(tmd)₂F₂]^+ and traps-[Cr(tmd)₂Fl]^+ ions is Interchange-dissociative mechanism and Dissociative mechanism respectively.
퍼즐 게임 환경에서 에이전트가 시작 상태로부터 목표 상태에 도달하기 위한 경로를 찾는 방법으로 트리 탐색 기법을 사용한다. 대표적인 트리탐색 기법으로 Brute-force 탐색과 휴리스틱(heuristic) 탐색이 있다. Brute-force 탐색의 경우 노드의 확장 과정에서 목표 상태와 가까워졌는지 확인할 수 없기 때문에 문제에 대한 해를 제공하지만 너무 많은 노드를 확장하게 되므로 소모적인 방법이다. 반면 휴리스틱 탐색은 휴리스틱 평가 함수(evaluation function)를 통해 우선순위를 평가하여 가장 바람직한 자식 노드로 확장시켜 나가는 탐색 방법이다. 따라서 좋은 휴리스틱 평가 함수를 설계하는 것이 휴리스틱 탐색의 효율을 높일 수 있다. 탐색 과정에서 발생할 수 있는 Dead-end 및 교착상태(deadlock) 상태는 목표 상태에 도달하지 못하게 만드는 주요 원인이다. 되추적(backtracking)과정은 Dead-end 상태를 극복하는 좋은 방법이지만, 교착상태 발생 시 불필요한 되추적 과정이 반복되어 많은 비용을 소모하게 된다. 본 논문에서는 퍼즐 게임 환경에서 허용 가능한 수준의 자원을 사용하여 목표 상태의 발견을 위한 알고리즘에 대하여 소개한다. 뿐만 아니라 체계적(systematic) 탐색 방법과 비체계적(nonsystematic) 탐색 방법을 비교 실험하여 최적 해를 발견위한 트리 탐색 알고리즘에 대하여 연구 하였다. 본 연구에서는 퍼즐 게임인 Prime Miner에서 휴리스틱 탐색의 성능을 측정하였고, 기존의 탐색 방법과 비교하여 성능 향상을 확인 하였다.
본 연구는 Buck-boost 컨버터와 Flyback 컨버터를 결합하여 단일 독립 DC 전압원으로 Cascaded 멀티 레벨 인버터의 구동할 수 있는 회로 구조를 제안한다. 기존 Cascaded 멀티 레벨 인버터는 출력 전압 레벨이 많을수록 정현파에 가까운 출력전압을 생성시킬 수 있어 H-bridge 모듈을 2개 이상 결합하여 출력전압을 생성했다. 하지만 이를 위해서는 H-bridge 모듈 수의 증가가 불가피하고, 각각의 H-bridge 모듈은 반드시 독립된 DC 전압원 확보가 필요한 문제점을 가졌다. 이러한 독립 DC 전압원 개수의 증가 문제를 해결하기 위해 본 논문에서 Buck-boost 컨버터와 Flyback 컨버터를 결합시켜 단일 DC 전원으로 5-Level을 출력할 수 있는 회로구조를 제안하였다. 제안된 컨버터의 동작원리를 이론적으로 분석하고 타당성 검증을 위해 PSIM 시뮬레이션 프로그램과 시작품의 실험을 통해 검증하였다.
Today, the world is being transformed into a knowledge and information society. Human beings should be able to actively cope with change with an open mind, and to develop creativity so that they can continually create ideas of judgment, thinking power, and novel ideas. The ultimate goal of art education is to help people to appreciate and understand art, and to cultivate civic qualities so that they can live a more affluent life than now. In this way, representative education for raising civil qualities in modern society can be practiced through smart education. By positively using smart devices, it is possible to show the turning point of new and improved education, to expand the range of experiences and thoughts for students, and to use various information networks You will get an opportunity to get in touch. The purpose of this study is to find effective ways of appreciation by using smart education in art appreciation class. The following conclusions were obtained from the results of the smart training exercise. First, after introducing the Cyber Museum site, the learner selected and watched each of them. As a result, the learner was able to search various information by using the smart device, not only from the viewpoint but also from the characteristics of the work, the history of the writer, . In the past, when information was obtained through dictionary or expert books, smart education could search for smart information devices and use them instantaneously regardless of location and time through advanced communication infrastructure. The cost reduction effect was obtained. Second, 72.4% of the learners who were interested in the class using the smart device were able to get the result that the class was not boring. If the existing teaching method was a textbook oriented class focused on knowledge injection, smart education would be able to acquire interesting knowledge by easily understanding difficult concepts while listening to ears, , And the self-directed learning was achieved by sharing and providing the data to the web space. In this way, smart education can induce learner 's participation and increase interest, so that both learner and educator can have high learning satisfaction. Third, the learner 's learning achievement, cooperative learning, discussion learning, and online learning were found to affect the academic achievement through the smart device. More than 80% of learners expressed their desire to continue teaching using smart devices, and this is because smart education is a lesson for today's generation of learners in the rapidly changing information age. In recent years, development of portable smart devices has made APP available for teaching. With various interesting contents, it can induce students' interest in education, so that students can voluntarily participate in classes and conduct effective teaching. A quick feedback using a program like CLICKER APP can be a highly satisfying lesson because of the interaction between the teacher and the student. By using these programs, I am confident that if we conduct smart education, we will be able to make efficient classes from the school environment and various difficulties and create a good educational environment suitable for the new generation.