• 한국수소및신에너지학회논문집
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• 제25권2호
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• pp.139-144
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• 2014

A Fuel Cell is one of the solving to reduce greenhouse gases. Despite the high efficiency and environmental friendly of Household Fuel Cell System it has hardly obtained popularity mainly due to its high prices. In order to encourage use of the system prices and operational expenses need to become economical. In this study, optimization through simulation was conducted to find out the optimal operational condition. As a result of simulation the system is operated with DSS operation from 5 O'clock until 19 O'clock for 13 hours at the constant output of 0.4kW to maximize reduction of energy rate. Furthermore, instead of the domestic system with the rated output of 1kW, rated output of the system should be reduced to 0.4 - 0.6kW which can promote installation of household Fuel Cell System.

• Journal of Electrical Engineering and Technology
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• 제13권5호
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• pp.1821-1830
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• 2018

With the wide application of intelligent household appliances, the optimization of electricity behavior has become an important component of home-based intelligent electricity. In this study, a multi-objective optimization model in an intelligent electricity environment is proposed based on economy and comfort. Firstly, the domestic consumer's load characteristics are analyzed, and the operating constraints of interruptible and transferable electrical appliances are defined. Then, constraints such as household electrical load, electricity habits, the correlation minimization electricity expenditure model of household appliances, and the comfort model of electricity use are integrated into multi-objective optimization. Finally, a continuous search multi-objective particle swarm algorithm is proposed to solve the optimization problem. The analysis of the corresponding example shows that the multi-objective optimization model can effectively reduce electricity costs and improve electricity use comfort.

• The Journal of Asian Finance, Economics and Business
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• 제8권3호
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• pp.821-832
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• 2021

Economic deprivation of households remains a significant economic issue in the world. Researchers have shown great concern in identifying crucial factors to enhance poor households' socio-economic performance. Therefore, this paper aims to develop a new conceptual framework to investigate the influence of different microfinance services on households' socioeconomic performance using moderated mediation analysis of various crucial factors. Focus-group interviews with managements of the microfinance institution, i.e. Amanah Ikhtiar Malaysia (AIM), and a systematic literature review were conducted for this purpose, and a new framework for the future study has been developed. The result from focus-group interviews and systematic literature review propose microfinance financial services, training programs, and business coaching as independent factors, whereas household socioeconomic performance as a dependent factor in the proposed model. Specifically, this study provides the direction to scholars to empirically test the direct relationship between financial services and household socioeconomic performance and the indirect relationship between training programs, business coaching, and household socioeconomic performance. Further, microfinance institutions' service efficiency is also included as a moderator that can strengthen microfinance services' effectiveness. The study also provides useful implications for policymakers, financial institutions, households, micro-enterprises, and researchers to better understand microfinance interventions and household economic mechanisms.

• International Journal of Air-Conditioning and Refrigeration
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• 제17권3호
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• pp.107-113
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• 2009

The objective of this study is to investigate performance characteristics of a household refrigerator using a two-stage compression cycle. The performance of the two-stage compression cycle was measured by varying the compressor speed, condensing temperature, and evaporating temperature. The COP of the two-stage compression cycle was analyzed and then compared with that of the single-stage compression cycle. The optimum combination of compressor speeds for a low- and a high-stage was determined. The COP of the two-stage compression cycle using a PTC (parallel two-stage compression) method was 5.85% higher than that of a STC (serial two-stage compression) method at optimum operating conditions.

• 수산경영론집
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• 제15권1호
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• pp.96-113
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• 1984

It has been appeared since 1979 that the pattern of laver culture changes from household management to entrepreneurial management. The typical entrepreneurial laver culture management (ELCM) can be defined as a management by the floating aquaculturing method and mechanical processing system. Historical studies show that the ELCM could be operated only under the following condintions; \circled1 securing capital, labor and aquaculturing farm. \circled2 Leveling up of technology to combine these resources effectively. \circled3 Realizing its true value of products for good profits. In turning from household mangement to ELCM, there are some obstacles as follows ; \circled1 Uncertainty, which cannot maintein the merit of mass production because the object of laver culture is living in the sea. \circled2 Immaturity of management owing manly to the lower level of technology and scarcity of competent managers. \circled3 Social problems ; lack of aquaculturing farm, overpopulation in fishing villiage, side-job with agriculture etc. For these reasons, there has been household management with overlabor and underconsumption in fishing village. In order that ELCM can enter the stage of maturity, those problems should be solved. Because ef laver industrial inferiority, these can be solved by the support assistance of government. As the required conditions in ELCM are filled by the government policy, ELCM are increased recently in its numbers.

• 문화기술의 융합
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• 제9권2호
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• pp.399-405
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• 2023

코로나블루 발생 원인을 분석해 우리 사회의 정신건강 증진 방안을 찾아보았다. 여성이 남성보다 코로나블루가 더 심했으며, 연령에 따른 차이는 없었다. 코로나19 이후 외부활동이 줄고, 가계경제는 어려워져 코로나블루가 늘었다. 늘어난 미디어이용량과 부정적인 미디어정보문제는 코로나블루를 증가시켰다. 온라인활동은 코로나블루에 영향을 주지 않았다. 미디어이용으로 증가한 사회문제관심은 미디어이용이 코로나블루에 영향을 주는 과정에서 부분매개효과를 갖고 있었다. 우울증을 줄이기 위해서는 개인의 외부활동을 늘리고, 여성과 경제적 약자의 사회 경제적인 여건을 더 개선하고, 미디어의 재난정보 품질을 높이고, 수용자는 미디어를 적정하게 이용해야 한다고 강조했다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 추계학술대회
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• pp.509-510
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• 2022

현재 경증치매를 갖고 있는 노인은 노인장기요양보험법에 의해 치매안심센터나 지역의 주간보호센터에서 인지프로그램을 제공받을 수 있지만, 지역의 독거노인은 치매 고위험군이면서 장기요양제도의 혜택은 받지 못하고 있는 상황이다. 독거노인의 비율은 점차로 높아져 가고 있지만 자립생활을 위한 일상생활능력향상 프로그램이나 치매예방을 위한 인지프로그램의 제공은 상당히 미미한 상황이다. 본 논문에서는 지역의 독거노인을 대상으로 ICT나 VR을 활용한 인지프로그램 개발의 필요성과 활용성을 조사, 분석하였다. 독거노인들은 새로운 기술에 대한 호감이 높았고, 기술활용에 대한 두려움과 호기심을 가지고 있었다. 다만, 새로운 기구나 기술을 접목할 때의 인간 관계와 유대감이 매우 필요함을 알 수 있었다.

• 대한화장품학회지
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• 제45권1호
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• pp.95-103
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• 2019

입술은 각질층이 매우 얇아 수분증발에 취약하며, 노화 과정에서 주름이 증가하고, 붉은색을 잃으며, 볼륨이 감소하게 된다. 매력적인 입술을 가지기 위해 시행되는 지방이식, 필러 주입을 대체하기 위한 성분에 대한 연구는 아직 보고된 바가 거의 없으며, 최근 새로운 지방세포의 수를 증가시키는 것이 인체 내 지방을 늘릴 수 있는 방법으로 제안되고 있다. 우리는 선행연구에서 지방줄기세포를 지방세포로 분화 유도하는 천연물질로써 요엽후박나무 추출물(Magnolia officinalis bark extract)의 우수한 효능을 확인하였다. 본 연구에서는 요엽후박나무 추출물이 바이오 프린팅으로 제작한 지방 유사 구조체에서 지방(lipid droplet)의 양을 증가시키면서 분화를 촉진시킴을 3D 수준에서 확인하였다. 다음으로 입술 주름에 미치는 영향을 확인하기 위해 주름 사진으로 부터 명암값의 표준편차(SDGV)를 J 이미지 소프트 웨어를 사용하여 측정함으로써 객관적 측정 방법을 확립하였고, 주름 정도에 따른 입술 주름 그레이드를 도출하여 정량화하였다. 결과적으로 요엽후 박나무 추출물 1%를 함유한 제품을 12주간 사용했을 때, 입술 주름을 유의하게 개선시킬 수 있음을 확인하였다. 본 연구 결과는 요엽후박나무 추출물이 지방줄기세포를 지방세포로 분화 유도하는 효능을 가지며, 이러한 효능이 입술 주름을 개선하는데 도움을 줄 수 있다는 점을 시사하고, 따라서 요엽후박나무 추출물은 입술 주름과 볼륨을 개선하는 화장품 후보 소재로 적용 가능하다는 것을 보여준다.

• Journal of Electrical Engineering and Technology
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• 제9권3호
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• pp.796-802
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• 2014

South Korea is recently under serious situation in supplying electricity with enough power reserve. A single fault of power plant at a peak-load time may lead to a total blackout for whole area connected by a single electric grid and isolated from other grids. Despite of the seriousness of blackout, however, there are scarce studies with ex-ante analysis of the economic costs from blackout. In order to evocate the seriousness, we calculate the economic costs for both industrial and household sectors with using some survey data and statistical methodologies. As a result, total economic costs are 39.23 trillion KRW (35.83 trillion KRW for industrial sector, 3.40 trillion KRW for household sector).

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 A
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• pp.330-332
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• 2004

Reliance on electric power has increased together with customer's demand for delightful and convenient linging. Recently, as appeared in the rapid growth of the technology of power electronics, the installation and apparatus using semiconductor applicotion is widly supplied and used from a household goods to industrial goods. However, these machine generate harmonics current and voltage for electric power system. The harmonics current is increased voltage distortion and generate a lot of interference in the electric power system. In this paper, the trend of the trend of suppression technology of harmonics outflow and the fundamental theory about the suppression of harmonics current in the distribution system are investigated and evaluated Therefore we look forward to supply electric power of good quality to satisfy the harmonics current guide line which is applied to household goods in the world.