• The Transactions of the Korean Institute of Electrical Engineers A
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• v.52 no.11
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• pp.668-674
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• 2003

The electric marketplace is in the midst of major changes designed to promote competition. No longer vertically integrated with guaranteed customers and suppliers, electric generators and distributors will have to compete to sell and buy electricity. Unit commitment (UC) in such a competitive environment is not the same as the traditional one anymore. The objective of UC is not to minimize production cost as before but to find the solution that produces a maximum profit for a generation firm. This paper presents a hi-level formulation that decomposes the UC game into a generation-decision game (first level game) and a state(on/off)-decision game (second level game). Derivation that the first-level game has a pure Cournot Nash equilibrium(NE) helps to solve the second-level game. In case of having a mixed NE in the second-level game, this paper chooses a pure strategy having maximum probability in the mixed strategy in order to obviate the probabilistic on/off state which may be infeasible. Simulation results shows that proposed method gives the adequate UC solutions corresponding to a NE.

• Asian Pacific Journal of Cancer Prevention
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• v.13 no.4
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• pp.1477-1482
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• 2012

Squamous cell carcinoma and adenocarcinoma are the major histological types of non-small cell lung cancer. Because they differ on the basis of histopathological and clinical characteristics and their relationship with smoking, their etiologies may be different; for example, different tumor suppressor genes may be related to the genesis of each type. We used microarray data to construct three regulatory networks to identify potential genes related to lung adenocarcinoma and squamous cell carcinoma and investigated the similarity and specificity of them. In the network, some of the observed transcription factors and target genes had been previously proven to be related to lung adenocarcinoma and squamous cell carcinoma. We also found some new transcription factors and target genes related to SCC. The results demonstrated that regulatory network analysis is useful in connection analysis between lung adenocarcinoma and squamous cell carcinoma.

• Culinary science and hospitality research
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• v.6 no.2
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• pp.291-314
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• 2000

At present, the students majoring in tourism apprach theoretically and practically target human resource development which is blanceded between creativity and specialty. And yet, the initial step of on-the-job tranning has not been worked and the area of tourism and experience in this field are know as a beginning stage. This, this study is focusing on the on-the-job tranning in the area of tourism major in technical college. The issues and alternative solutions are as follows First, many student hope sutible training cost require. Second, An amount of subsidy for trainee is too low, and a trainee is used as substitution for regularem ployee's vacation during summer season and for beginning and end of year during winter season. Third, There is no clear linkage between job training and employment. Forth, many students enter a technical college due to learn professional technique and service, however, many other students go to a technical college as means of transfer to university, Since a tourism bussiness is predicted as a potential industry for the twenty-first century, besides a positive national economy and tourism business, the continuing and active supports and needed as follows First, An active support on tranning provided by tourism companies is required. Second, A continuos driving force and thorough management of job training by technical college and relevant major department are needed. Third, sutible traninging cost would be required. Forth, In order to achive a objectives and practical and effect ive job tranning, students majoring in tourism should enhance a service mind and manner.

• Journal of the Korean housing association
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• v.23 no.2
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• pp.79-87
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• 2012

The purpose of this study was to offer improvements, by deriving practical problems and suggesting ways to improve more realistic solutions in the multi-family housing management industry. This study is conducted in two ways. First, it was performed by reviewing related previous studies and clarifying major issues in the multi-family housing management. Second, it was performed by a questionnaire survey method, focused on the worker's opinions for that matters. The respondents work in an apartment in Seoul and the metropolitan area. A questionnaire distributed via e-mail, and then were collected. And questionnaire did not respond were excluded from the analysis. Finding were as follows -; first, it was possible to clarify four types regarding major issues in the multi-family housing management such as 'management system', 'housing management market conditions', 'management consciousness of resident', 'management performances'. Second, it was found that the competition was fierce in the same kind. And it was quite a high turnover rate of workers because of poor working conditions. Third, the most hard part was that the employee welfare was not good at work.

• Journal of the Korean Institute of Rural Architecture
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• v.13 no.4
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• pp.115-124
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• 2011

This study examines the process of urban formation in the city of Yanji. The analysis is done by the change of street pattern and major facility location in a timely manner by appling space syntax method. This research categorizes the pattern of the urban growth focused on two urban forms, street and major buildings, in the city and is offered of the meaning of the first value on interpretation of the urban growth in the city of Yanji. The result of the research are as follows. First, the period of the city transformation is divided into four stage; intuitive period, grid-iron formative period, consolidation period, and urban expansion period. Second, characteristics of each stage have been analyzed. At the first stage, the city started to frame along both buildings and streets which were placed without a plan. At the second stage, the city was planned and constructed into new grid-iron pattern ignoring existing context by Jananese colony. At the consolidation period, the road system expands from the city center toward suburban. At the last expansion period, the shape of the city has complicated its shape with complex road system. This study contributes to provide a basic analysis and data to investigate how the Yanji city has evolved over period of time. But further continuous research should be done for future urban development of the Yanji city.

• Economic and Environmental Geology
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• v.11 no.4
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• pp.143-167
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• 1978

The Sangdong tungsten (mostly scheelite) mine is located on the southern limb of a major syncline, the Hambaeg syncline, in a thick sequence of lower Paleozoic sedimentary rocks in the mideastern part of south Korea. Productive scheelite mineralization in Sangdong area is confined to one single formation, the Myobong Slate. Four major ore beds, which have an lateral extension over than 1 km and were not heavily subjected to spatial disturbance, are developed in the Myobong Formation. The original materials of the ore-comprising horizones were probably of either calcareous or silceous sediments. The four ore beds, especially in the case of Main ore bed, display both lateral and vertical zoning. Association quartz-mica-scheelite is predominant in the central, while association hornblende-quartz-diopside-scheelite, diopside-garnet and wollastonite-garnet are developed in this order towards the periphery of the ore beds. Petrologically, two phases of thermometamorphism are recognized. The first phase is represented by the association wollastonite-garnet and diopside-garnet, while the second phase by the association hornblende-quartz-diopside-scheelite and quartz-mica-scheelite. The associations of the second phase do constitute prodctive ore. The high background value of tungsten in the area surrounding the Sangdong mine reveals that the area can be considered a geochemical zone enriched in tungsten. Studies on the trace element patterns were carried out to draw useful criteria for the purpose of future geochemical exploration in the area. The increasing trend of the ratio Rb $({\times}1000)/K_2O$ of the Myobong Slate towards the known mineralization area proved to be indicative for the presence of tungsten mineralization.

• Korean Institute of Interior Design Journal
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• v.13 no.5
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• pp.173-180
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• 2004

The cultural identity of each nation has appeared as a major issue in this multi-cultural era, and needs to define It clearly through comparisons with other cultures have been raised. The purpose of this study is to figure out ‘similarity’ and ‘dissimilarity’ on design characteristics of traditional storage furniture in interior context of Korea, China and Japan. Comparative analysis of traditional furniture was conducted in two terms, in terms of inner space, first, spatial elevation and front patterns, second, flooring materials of the interior space and types of furniture legs. Result of first comparative analysis showed that composition of windows, one of the major decorative elements of interior space, positively influenced on furniture, and reflected unique patterns of each country. Second comparative analysis showed that structures and shapes of traditional furniture vary depending on flooring materials. As a result of it, Korean furniture has the structure of ‘punghyeol’ and Chinese furniture has the structure of ‘aja’ with ‘takni’ , a combination of legs. In contrast to the two countries, Japanese furniture has rarely legs. The result of analysis is expected to act a role of establishing the cultural identity of our own country.

• Korean Journal of Clinical Laboratory Science
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• v.36 no.2
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• pp.233-238
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• 2004

This study was conducted to investigate an attitude related to clinical laboratory science students' clinical practice. Data for this analysis was gathered from March to May, 2004 by the questionnaires of 348 students who are in their third year in 5 colleges and have experienced clinical practice. The students were satisfied with the term of clinical practice (70.4%) and the first factor influencing them in clinical practice was sincerity (45.1%), and the second was basic knowledge (19.8%). In the contents of clinical practice, 53.2% were satisfied but 43.3% of them showed negative responses because their practice was limited and they were simply assistants. 74.1% were satisfied after experiencing clinical practice and the first factor was improvement of understanding and interest in their major (65.9%) and the second was the gain of confidence (20.1%). Among anxieties in the clinical practice, a shortage of self-confidence (47.7%) was the highest. 81.3% of them wanted to maintain medical technologist's life continuously. It appeared that the more satisfied with their major, the more satisfied with the clinical practice (p<0.05). As a result, the students were satisfied with the clinical practice and fresh experience generally. But they were relatively unsatisfied with the practicality, and connection with the lecture. As a part of efforts to formulate an effective system for clinical practice, it is necessary to establish concrete goals and detail check lists to guide these students among professors, trainers and students.

• The Mathematical Education
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• v.45 no.2 s.113
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• pp.217-230
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• 2006

The purpose of this study is to inquire the building process of Pedagogical Content Knowledge of prospective mathematics teachers about the function concepts. For this purpose, We performed the following steps; First, we performed the survey relaying to the prospective mathematics teachers' teaching experiences, capabilities of their error evaluation of the students, and viewpoints about the function concepts. Second, we performed the survey on the subject-matter knowledge about the function concepts and the key items of designing teaching plans about the function concepts. And then, we interviewed the participants to check the results of the surveys and to supplement the necessary contents. The collected data was relatively correlative and analyzed in the process. As a result, we found the followings; First, subject-matter knowledge of prospective mathematics teachers about the function concepts is different depending on the grades. Second, prospective mathematics teachers are building more extended function concepts through the major subjects. Third, the major subjects are important to build the Pedagogical Content Knowledge of function concepts. Fourth, teaching experience plays an important role in transforming subject-matter knowledge of function concepts to Pedagogical Content Knowledge of it. Fifth, building the Pedagogical Content Knowledge means transferring the teacher's viewpoint from himself/herself to the learner.

• Journal of Korean Elementary Science Education
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• v.18 no.1
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• pp.65-73
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• 1999

The purpose of this study is tile development of tile observation Assessment criteria that is used to assess manipulative skills in elementary science. The procedures of developing observation Assessment criteria are as follows. First, we investigated the actual condition about science process skills assessment with tile questionnaire. Second, we selected 7 experimental apparatus through the analysis of the science textbooks. The selected experimental apparatus are dropper, alcohol lamp, thermometer, test tube, filtering device, able balance, graduated cylinder Third, the observation Assessment criteria arc developed through tile analysis of the related experimental textbooks, the demonstrations, and the questionnaire, Forth, tile validity is verified by science education specialists and graduate students who major in science education. Fifth, the first jilter-rater agreement is investigated in the result of the field with observation criteria of which the validity was verified. The second inter-rater agreement is investigated through the revision and the addition of the criteria with the low agreement. In result, the jilter-rater agreement ranged from 0.86 to 0.98. One of the major problems in observation assessment is the rater's subjective viewpoint. So, this research shows a more specified scale and criteria for the assessment. This suggests that the observation Assessment criteria developed in tile study satisfies the high reliability and validity requirements. Considering the results, this criteria call be used effectively for assessing manipulative skills of elementary school students.