• 한국전기전자재료학회논문지
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• 제14권3호
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• pp.228-233
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• 2001

This paper presents the optimized design, fabrication and thermal characteristics of micro-heaters for thermal MEMS (micro elelctro mechanical system) applications usign SOI (Si-on-insulator) and trench structures. The micro-heater is based on a thermal measurement principle and contains for thermal isolation regions a 10㎛ thick Si membrane with oxide-filled trenches in the SOI membrane rim. The micro-heater was fabricated with Pt-RTD (resistance thermometer device) on the same substrate by suing MgO as medium layer. The thermal characteristics of the micro-heater wit the SOI membrane is 280$\^{C}$ at input power 0.9W; for the SOI membrane with 10 trenches, it is 580$\^{C}$ due to reduction of the external thermal loss. Therefore, the micro-heater with trenches in SOI membrane rim provides a powerful and versatile alternative technology for improving the performance of micro-thermal sensors and actuators.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.1243-1248
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• 2008

$CO_2$ emission amount and characteristics of combined heat and power (CHP) plant in industrial complex of Korea is evaluated by using the fuel analysis method. Fuel analysis methods of several foreign countries and developed one which is developed considering the operation characteristics of the surveyed CHP plants are used. The operation data is surveyed for all of the CHP plants in industrial complex and is composed of fuel consumption amount, generation, sale and efficiency of heat and electricity, condensed steam enthalpy, and etc of the each CHP.

• 한국지열·수열에너지학회논문집
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• 제17권3호
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• pp.1-12
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• 2021

In this study, the effects of various operational conditions for floor radiant heating system were researched by experiments. Hot water supply set temperature, indoor air set temperature and supply water flowrate were considered as operational conditions. The control method for this system is On-Off control of automatic thermostatic valve. The purpose of this study is to evaluate indoor thermal control characteristics and energy performance, respectively. As a result, if lower supply water temperature is applied, the supply and return temperature difference is reduced and energy consumption of heat supply is also reduced.

• 한국지열·수열에너지학회논문집
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• 제14권4호
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• pp.13-19
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• 2018

The Effects of hot water supply temperature on indoor thermal characteristics for floor radiant heating system in residential apartment were researched by computer simulation. The parametric study on hot water supply temperatures with different outdoor air temperatures was done with regard to energy performance and control characteristics, respectively. As a result, the maximum overshoot of indoor air temperature and energy consumption were reduced by adjusting the hot water supply temperatures with outdoor air temperatures.

• 전기학회논문지
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• 제56권6호
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• pp.1039-1046
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• 2007

This paper presents the analysis for power consumption, mechanical vibration and acoustic noise characteristics of the Coreless and Slotless Brushless DC motor in Digital Lightening Processor(DLP) Motor with the Air-Dynamic Bearing. The Coreless BLDC motor has not the stator yoke as well as the stator slot to remove the unbalance force by the interaction between the stator yoke and Air-Dynamic Bearing clearance. The assembling tolerance and the processing error make the air-gap difference between the magnet and the stator yoke .which occurs the unbalanced electro-magnetic force in the Slotless BLDC motor. It imposes the air-dynamic bearing on the disturbance force and makes the Air-Dynamic Bearing vibrated and noised. Also, The attractive force between the magnet and the silicon steel stator yoke increases the power consumption. In this paper, the power consumption, mechanical vibration and acoustic noise of the Coreless BLDC motor and the Slotless BLDC motor with the silicon steel stator yoke are simulated, analyzed, and tested using the manufactured proto-type motors with Air-Dynamic bearing. The simulated and tested results present that the Coreless BLDC motor without the silicon steel stator yoke has the lower mechanical vibration and noise ,and lower power consumption than the Slotless BLDC motor with the silicon steel stator yoke in Digital Lightening Processor Motor with Air-Dynamic Bearing.

• 한국언론정보학보
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• 제40권
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• pp.221-248
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• 2007

본 연구는 다양한 영화 창구별 소비 특성 및 후속 시장에서의 소비 특성을 살펴보기 위한 것이다. 본 연구의 주요 분석 결과는 다음과 같다. 첫째, 응답자에게 영화 소비 선호 창구를 질문한 결과, 극장, 비디오, DVD, 지상파TV, 케이블TV, 인터넷 등을 포함하는 6개 영화 소비 매체별 조합이 48개로 나타났다. 극장은 자체만의 창구 시장 점유율은 33.5% 정도로 추정되지만, 비디오와 DVD, 지상파TV, 케이블TV, 인터넷 등의 후속 창구와 연계될 때에는 총 64.50%까지 시장이 확대되는 것으로 나타났다. 이는 영화가 다른 후속 창구와의 의존도가 높다는 것을 의미하기도 한다. 둘째, 인구통계학적 특성별 영화 소비 창구 특성을 살펴보았다. 연령별로 영화 소비 창구 조합의 특성을 살펴보면, 40대 응답자들은 극장이 차지하는 비중이 가장 높게 나타난 반면, 10대 응답자들은 극장 비중이 낮게 나타났다. 학력별로 살펴보면, 대졸 이상 응답자들이 극장을 영화 소비 창구로 선택하는 비율은 34.3%인 반면, 고졸 이하 응답자들은 13.1%로 나타났다. 소득별로 영화 소비 창구 조합의 특성을 살펴보면, 400만 원 이상의 고소득 계층에 속하는 응답자들은 극장 비중이 48.9%로 매우 높은 반면, 기타 다른 시장이 차지하는 비중은 낮은 것으로 나타났다. 100만 원 미만의 소득을 갖는 응답자들은 극장 및 후속시장 2개의 비중이 16.8%로 다른 집단에 비해 높은 것으로 나타났다. 영화 소비량별로 영화 소비 창구 조합의 특성을 살펴보면, 영화 소비량이 증가할수록 극장 의존도가 감소하는 것으로 나타났다. 셋째, 극장에서는 일차 소비만으로 더 이상 영화를 소비하지 않는 응답자 비율이 47.7%로 나타난 반면, 개별 후속 시장에서는 그 비중이 0.8%로 나타났다. 이는 후속 시장에서 영화를 소비한 응답자들은 다른 창구에서도 계속적으로 영화에 접근한다는 것을 의미한다.

• 한국생활과학회지
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• 제20권5호
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• pp.1047-1057
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• 2011

The purpose of this study was to investigate the differences is food consumption behavior based on singles' food-related lifestyle. A survey was conducted with singles(age 25~54) in the Seoul metropolitan area. Out of 2,051 questionnaires distributed, 300 were analyzed(15.21% response rate). The data was analyzed using SPSS windows(ver. 17.0). Singles' food-related lifestyles were categorized into three groups. In addition, the respondents were divided into three groups by cluster analysis: convenience oriented group, wellbeing dining-out oriented group, and uninvolved group. The food consumption behavior of each group was significantly different in terms of considerations of food consumption, preference of food product types, and breakfast types. The convenience oriented group prefered to buy ready to cook food, ready to heat food and ready to eat food. Moreover, they often eat instant food. The wellbeing dining-out group is more interested in foods and their health than other groups. The uninvolved group was not concerned about food. This study suggests that the food industry the characteristics of singles' needs to be analyzed more systematically. By analyzing the characteristics of singles', the food industry can use the data to establish a marketing strategy for them.

• 한국실내디자인학회논문집
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• 제18권6호
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• pp.221-228
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• 2009

Recently severity of ecological adaptation and climatic change due to global warming grows larger. According to the fourth report of IPCC in 2007, emission quantity of the earth greenhouse gas(GHGs) generated by activity of mankind increased with 80% since 1970. And it is forecasted that worldwide greenhouse gas will be increased with 25~90%(corresponding to $CO_2$) between 2000 and 2030. This increment of greenhouse gas($CO_2$) is expected to raise average temperature of the earth with the maximum $6.4^{\circ}C$, and sea surface with 59cm in 2090. Like this, destruction of environment by greenhouse gas is regarded as universal problem threatening the existence, not only the problem of one nation. Consequently, systematic correspondence to the global warming at the aspect of energy consumption is also needed in Korea. From the analysis result of 'Statistics of Energy Consumption' published by Green Korea in 2007, energy consumption increment of domestic universities was higher as many as 3.7 times than 22.5% of the whole energy consumption increment in our country. This says to be the direct example which shows that universities are huge sources of greenhouse gas emission. New constructing and enlarging buildings of each universities within campus are the most major reason for such a large increment of energy consumption in universities. The opinion that the possibility of causing energy waste and efficiency reduction is raised by increased buildings of universities has been propounded. That is, universities should make concrete goal and the plan for reducing emission of green house gas against climatic change, and should practice. Accordingly, there is the meaning that 2 aspects of environment-friendly design characteristics, that is application of energy utilizing technology, material usage of energy efficiency-side and environment-side, and introduction of natural element in the environmental aspect, were analyzed for facilities of university campus designed in environment-friendly point of view from initial stage of plan, and direction of environment-friendly design of university facilities in the future was groped in order to grasp environment-friendly design tendency of internal and external University facilities based on this analysis of this paper.

• 한국의류산업학회지
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• 제23권2호
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• pp.186-199
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• 2021

SNS (social networking service) plays an important role in delivering information regarding fashion brands and providing a space for communication between fashion retailers and SNS users, as well as between users. This study primarily focuses on exploring the relationships among the motivation of SNS users and social comparison, clothing purchasing behaviors and the difference in the relationships according to individual characteristics. An online survey was conducted on Chinese female consumers in their 20's and 30's who had experience in fashion SNS. A total of 297 women completed online survey. The results of the study revealed that: (1) consumers who have stronger motivation of information seeking and interpersonal communication through fashion SNS reached more active upward comparison and peer comparison accordingly; (2) upward comparison had a significant effect on conspicuous consumption and bandwagon, while peer comparison had no significant effect; and (3) the self-esteem of fashion SNS users significantly moderated the effect of social comparison on conspicuous consumption and conformity consumption. This study contributed to expanding the knowledge on the relationships among the motivations of SNS users and social comparison, and shed light on Chinese SNS users' characteristics and purchasing behaviors in the fashion SNS context. This study also provides vital implications to fashion brands and retailers.

• Human Ecology Research
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• 제57권1호
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• pp.143-157
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• 2019

This study analyzed per capita expenditure (food expenses, housing expenses, health care costs, and cultural & entertainment expenses) by the consumption quintile for middle and older elderly households in addition to personal characteristics, household characteristics and economic factors affecting it. A sample collected from the 6th KLoSHA in 2016, was 2,983 households. First, among each per capita expenditure, the largest expenditure was food expenses, followed by housing expenses, health care costs and cultural & entertainment expenses. Compared with the first quintile of personal consumption expenditure, the largest increase in the fifth quintile was food expenses, followed by cultural & entertainment expenses, housing expenses, and health care costs. Second, compared to the fifth quintile of per capita food expenses, all other quintile had negative effects, and only the first quintile showed a negative effect compared to the fifth quintile of per capita housing expenses. The first, the second, and third quintile had a negative effect compared to the fifth quintile of per capita health care costs. Compared with the fifth quintile of per capita cultural & entertainment expenses, only the third quintile showed a negative effect. Third, in all quintile of per capita food expenses, the most influential variable from the first quintile to the third quintile was marital status, while in the fourth and fifth quintile included household income. In all quintile of per capita health care costs, health status was the most influential variable from the first quintile to the fourth quintile, and residence was in the fifth quintile.