• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.804-805
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• 2006

Electric scroll-compressor drives are commonly used for e.g. home appliance cooling units. The recent development of hybrid cars with internal combustion engine in combination with electrical propulsion requires new solutions to be able to cool the passenger compartment of cars at stand-still. Both application areas demand efficient motor drives to reach good economy and efficient use of limited battery power as well as competitive volume/weight for a given output. The BLDC motor is a controllable and efficient solution. A major part of the motor is the soft-magnetic core. The powder based $Somaloy^{(R)}$ material shows high resistivity and induction as the result of engineered iron particles with in-organic coating. The unique features of compacted $Somaloy^{(R)}$ components can be utilized to enhance the shape and total volume of the BLDC motor with at least maintained efficiency compared to the use of traditional laminated steel sheet cores. A careful design of the $Somaloy^{(R)}$ components can also simplify assembly and positively influence the coil configuration. This study shows a comparison between a typical laminated BLDC motor and a redesigned, $Somaloy^{(R)}$ based version adapted for a scroll-compressor application.

• The Journal of Asian Finance, Economics and Business
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• 제7권10호
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• pp.523-530
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• 2020

The efficient market hypothesis explains the random walk hypothesis suggesting that stock prices are independent of each other, hence, it is impossible to earn abnormal profits. The positive effect of a well-functioning and highly efficient stock market on the performance of an economy motivated the Philippine Stock Exchange to pursue massive modernization initiatives. This research provides evidence of the existence of random walk in the Philippine stock market employing the Augmented Dickey-Fuller (1981) and Phillips-Perron (1988) unit root tests, the Lo-MacKinlay's (1988) conventional variance ratio test, and Chow-Denning's (1993) simple multiple variance ratio test. Results of the ADF and PP unit root tests confirm the necessary condition for a random walk. The Chow-Denning (1993) maximum /z/ statistic and the Wald test statistic as in Richardson and Smith (1991) for the joint hypotheses and the Lo and MacKinlay (1988) individual statistics variance ratio test generally accepted the null hypothesis of a random walk. That is, the unit root and variance ratio tests consistently indicate that the null hypothesis of random walk cannot be rejected. The existence of a random walk in weak-form efficiency can be attributed to market liquidity as a result of continuous development and modernization of the Philippine equity market.

• 안보군사학연구
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• 통권2호
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• pp.23-89
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• 2004

The protective area of military installations can be a essential investment goods for producting public goods like military installations and national security. For the purpose of this, The protective area of military installations are set up and applicated at important strategic areas. It causes colplications and frictions among the people, government and army inevitably to set up the protective area of military installations, as the relation between the army which produces security or public goods and the people that make and use valuable goods is opposed and contradictory to each other. Heretofore, the civil petition of the protective affair to military installations has been presented individually. As local self- government is fixed, a local selg-governing body presents many civil petitions now. Therefore the protective affair to military installations came to be examined carefully in the aspecs of improving the relationship between the civil and army, raising natinal competitiveness, and increasing efficiency of military operations. Though the relationship between the civil and army is opposed and contradictory, it is required to be in keeping with each other with a situation around society, that is, changes and trend of national security, politics, economy, society. Accordingly, if you drive plans of rational management to the protective area of military installations, you can not only achieve successful military installations, but also be a great help to growth of a local community. Then 「The Army with the people」worthy of the name can be real.

• KIEAE Journal
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• 제9권5호
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• pp.29-37
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• 2009

As with the January 2005 amendment of the Act on Private Participation in Infrastructure, schools are now included in the scope of privately-funded infrastructure projects. According to the announcement made by the Ministry of Education, Science and Technology in 2007, a total of 1.1 billion-won stimulus package has been proposed and is being implemented to operate private investments in social infrastructure helping to secure sufficient educational facilities for a period of five years from 2005 to 2010. Private participation offers first-priority infrastructure in a timely manner, raises efficiency with creative project conception and design, and stimulates economy by tapping into unemployed fund. This study limited its scope to new school construction projects in Gyeonggi Province which have been implemented via BTL system since January 2005. And using field-inspection and interview techniques, the study proposed improvement schemes applicable to the field. The results will be fully incorporated into new school construction projects to be carried out in the future, to help build creative learning space-student-oriented quality structures-where in Korea's leaders of the 21st century knowledge-based society will be educated.

• 복식
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• 제60권10호
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• pp.146-162
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• 2010

The purposes were to identify clothing shopping orientation and service perception of online shopping mall according to Mongolian's internet lifestyle. A questionnaire developed by researchers was used and 310 Mongolian in 20's were the subjects. Survey was done during Jan. and Feb. 2010. Most Mongolian used internet at home or office and had used internet less than one year. Half of Mongolian visited online shopping mall less than 5 times during last year. Most Mongolian did not buy any fashion items at online mall but had higher intention to shop at online mall. Factors of Mongolian's internet lifestyle were information search, shopping pursuit, and utilizing ability and segmented into internet heavy users and light users. Factors of fashion shopping orientation were individuality & brands, fashion, diversity, economy, pleasure, and efficiency and factors of online shopping mall service were order & delivery and products. Internet heavy users were found more frequently among married men with high income, experienced online shopping more, showed higher fashion shopping orientation, and pursued online shopping mall service more. Internet light users were among unmarried women with low income, not experienced online shopping, showed lower fashion shopping orientation, and pursued online shopping mall service less.

• World Technopolis Review
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• 제3권1호
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• pp.39-54
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• 2014

Recently, investment to basic science has been increased and infrastructure of science and technology has been expanded in developed countries like U.S.A, UK and Japan to foster high-tech industries. Science and research parks are built and under operation to acquire national competitive power and to activate regional economy over the world today. It is argued that more synergy effects are generated when science and research parks are operated in cooperation with related organizations and facilities such as firms, universities, research institutes and governments than it is operated by one organization. The aim of this paper is to develop a governance model of science and research parks. One comprehensive model and three individual governance models were developed according to the structure and relations of industry-science/research park-supporting organization interactions. When governance model of science and research parks is established and properly managed, national development capacity would be greatly enhanced through the acceleration of technology transfer, industrial production rise and enhancement of efficiency in the area of R&D and supporting system etc. One of the key factors in building governance system for science and research parks is establishing a control tower that supervises governance system comprehensively and systematically.

• 설비공학논문집
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• 제26권6호
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• pp.287-293
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• 2014

Internal combustion engines release 30~40% of the energy from fossil fuels into the atmosphere in the form of exhaust gases. By utilizing this waste heat, plenty of energy can be conserved in the auto industry. Thermoelectric generation is one way of transforming the energy from engine's exhaust gases into electricity in a vehicle. The thermoelectric generators located on the exhaust pipe have been developed for vehicle applications. Different experiments with thermoelectric generators have been conducted under various test conditions as following examples: hot gas temperature, hot gas mass flow rate, coolant temperature, and coolant mass flow rate. The experimental results have shown that the generated electrical power increases significantly with the temperature difference between the hot and the cold side of the thermoelectric generator and the gas flow rate of the hot-side heat exchanger. In addition, the gas temperature of the hot-side heat exchanger decreases with the length of the thermoelectric generator, especially at a low gas flow rate.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.412-417
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• 2005

To ensure the safety of the tunnelling without the loss of economy, the tunnel seismic profiling(TSP) method for the prediction ahead of tunnel face, begins to be used routinely in these days. TSP method does not interfere the tunnelling works while the horizontal drilling does, and its prediction length is longer than that of the drilling. Yet the most frequently adopted technique of TSP in Korea is the multi-shot and 2 receiver array using in-hole receivers, even though this array requires as many as 26 drill-holes for receiver installation and ballasting, which results in 3-6 hours of suspension in excavation work. In this paper, multi-receiver and lesser shot array using side-wall attached 3 component geophones is to be described to prove the efficiency in terms of the survey time as well as the reliability of the method by comparison of the predicted weak points and the face mapping results. The predictions mostly agreed with the real fractures or joint developed zones which have been confirmed during the excavation. It also has been found that TSP method can be effectively applied to perform draining ground water ahead of tunnel face by imaging the geologic discontinuities.

• 수산경영론집
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• 제44권1호
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• pp.39-57
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• 2013

This study aims to examine problems of retail business operated by primary fisheries cooperatives and provide some suggestions for enhancing their retail business function. It reveals that although sales business function of fisheries cooperatives is very important for the members of Korean fisheries cooperatives, their performance and efficiency outcomes have been disappointing. The research offers six suggestions in two categories to resolve the issues. In the first category as a marketing plan for retail business of primary fisheries cooperatives, first, enhance of marine products business using local specialty goods. second, expanded of on-line shopping mall and third, joint marketings among primary cooperatives are necessary. In second category as an assistance plan of National Federation of Fisheries Cooperatives(NFFC) for primary fisheries cooperatives, First, we needed to making logistics system for fisheries. Second, conducting retail business consulting for primary fisheries cooperatives. Finally, human resource development programs are needed. Primary fisheries cooperatives have to discipline faithfully as a cooperatives for NFFC roles as a cooperatives. So making marine products sales business as a core of a economy business of primary fisheries cooperatives in Korea is very important.

• 한국건축시공학회지
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• 제13권4호
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• pp.416-423
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• 2013

An adjusted assessment model based on benefit-cost analysis (BCA) is proposed for evaluating the economic efficiency of automated construction technologies. In contrast to conventional BCA, the model does not compare monetary values, but the differences in benefits and costs between traditional and automated construction methods. To verify the usefulness of the model, it was applied to a real-scale building construction project that used a fully automated building construction system, and the face validity of the model was confirmed. The results indicate that the model can support decision makers in identifying valuable benefit factors and in assessing the cost effectiveness of the system.