• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.2108-2111
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• 2005

The mission life of a satellite determines the amount of fuel required on-board, while the total mass requirement limits the fuel to be loaded. Hence, for the design of thruster control loop, not only the satellite pointing accuracy but the saving of fuel is to be considered. In this paper, a two-step fuzzy controller is proposed for the thruster control loop to save fuel consumption. This approach combines requirements for pointing control accuracy with minimum fuel consumption into a fuzzy controller design. To demonstrate this approach, we have designed a fuzzy controller for the Sun point Mode of KOMPSAT-2. The performance of this fuzzy controller design is compared with that of PD controller used for KOMPSAT-2.

• Proceedings of the KIEE Conference
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• 2002.07d
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• pp.2388-2390
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• 2002

Small type electric energy saving system is proposed in this paper. The system improves power factor fastly according to load variation of each customer. Phases of voltage and current are detected as 1[ms] unit. Phase coincident algorithm is applied for power factor improvement. Capacitance is controlled for optimal power factor correction. Series reactor is controlled for harmonics reduction. Non-contact device is used for fast response and long life. Test result shows the effect of this system. Power factor of 40[W] electric fan is improved from 95[%] to 100[%]. In the case of electric light, power factor is improved from 82[%] to 100[%]. Response time for load variation is less than 1[ms].

• Journal of Families and Better Life
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• v.17 no.1
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• pp.167-178
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• 1999

The purpose of this study were to 1) classify the domain according to the level f housework sociaklization and 2) illuminate the determinants on it. The subjects of this study were 564 married women living in Seoul. A questionnaire was used as survey method. Frequenciaes percentiles mean and regression were employed for data analysis. major findings were as follows; 1) The domain according to the level of housework socialization were purchases of storage food convemience food dining-out clothes repairing services and laundry wervices 2) Of market goods characteristics quality and time-saving characteristics were influencing variables in the level of storage food purchases. The affecting variables in the level of convenience food purchases dining-out and clothes repairing services purchases was quality of market goods. In the level of laundry services time-saving characteristics was significant.

• Proceedings of the KIEE Conference
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• 1998.07c
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• pp.838-840
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• 1998

The power demand has increased the groth of industry and improvement of life. Otherwise the power supply is more difficult. because of regional egoism, reinforcement for environment, and investment of money. The load installation should be promoted to rational power management, according to the network, inteligent, and high-function. Therefore, this paper is made a study for the method of energy saving and for energy saving of medium-small type small type-below 500kW medium type-between $500{\sim}1.000kW$.

• Korea Science and Art Forum
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• v.19
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• pp.561-568
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• 2015

A lot of electrical energy is used in our daily life. While energy saving concerns are overall, consumption practices of people in general are very different. People want to control their energy use and by knowing the amount of energy they use. Smart plug is a new device that measures electricity usage through each plug at an outlet with on/off control. User experience for electrical devices in regards to electricity usage should be newly designed. In this study, based on the survey, personas have been devised and their energy use experience in relation with smart plugs have been designed. Service models have been designed as well. By designing service with smart plug, user could enhance the experience of energy usage and saving and energy consumption practices could be improved in a sustainable manner.

• Journal of Families and Better Life
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• v.25 no.2 s.86
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• pp.23-36
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• 2007

Or this research, it was investigated the differences in the pro-environmental behaviors in purchase, use and management, and disposal of clothing by socio-demographic characteristics and other variables. In addition, it was classified Korean consumers into several comsumer groups based on the different purchase behavior style, and then investigated the difference among these consumer groups in purchase, use and management, and disposal of clothing in light of the pro-environmental behavior. The following is the summary of the main results. First, consumers with high income and ha41g a lot of clothing were less likely to purchase used-clothing while consumers who were non-married and in low-income status were more likely to rent clothing. In additions, female, married consumers, and consumers with less-educated were more likely to manage their clothing frequently. Second, it was classified consumers into several groups based on the different purchase behavior style, these were "rational purchasing", "saving-money purchasing", "regretting for their purchasing", and "over-purchasing". Third, "saving-money purchasing" group showed a high expenditure rate in the purchase of used-clothing but a low rate in "over-purchasing" group. The frequency of management of clothing was the highest in the group of "over-purchasing" and the next in the group of "saving-money purchasing". The group of "over-purchasing" were more likely to show irrational decision-making style, manage and disposal their clothing frequently, "saving-money purchasing" purchased used-clothing frequently, and the level of management of clothing were less in the group of "regretting for their purchasing".

• The Journal of Asian Finance, Economics and Business
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• v.7 no.5
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• pp.279-290
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• 2020

This study examines how economic preparation for later life directly influences life after retirement. As people's life cycle is gradually getting longer, preparation for the later time with less economic activity after retirement is becoming more important. Thus, this study analyzes the factors influencing life after retirement. Data comes from the Korean Retirement and Income Study (KReIS) surveyed carried out by the National Pension Research Institute in 2015. The analysis includes Cronbach's alpha, Pearson Product Moment Correlation Coefficient and Sobel Test. This study confirms that voluntary retirement has a positive influence on life satisfaction. Results are in line with previous research about the relationship between voluntary retirement and retired life. When a person retires voluntarily, financial preparation can be made in advance for retirement. In case of involuntary retirement, people may experience a sense of loss in personal standing and financial difficulties due to the unexpected situation. Especially, early retirement from the main workplace leads to unstable later life. The study's policy recommendation, in particular, calls on government and businesses to agree on social responsibility for helping employees to retire in the predictable retirement time and, thus, enabling the retiree to decide all aspects of the path after retirement.

• Journal of the Korean housing association
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• v.17 no.4
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• pp.73-81
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• 2006

The aim of this study is to clarify the provision for later life and needs for elderly housing according to the cognitional attitude about the elderly housing. 420 middle aged who lived in Kyungnam area were responded to self-questionnaire. Two groups are divided by the cognitional attitude about the elderly housing, one is positive group and the other is negative. The positive group is higher monthly income, upper college school career and apartment housing types. Economic means to provide for their later life are an insurance, a saving, a pension etc. The positive group is willing to do higher economic expenses for elderly housing in downtown or suburban area. And the positive group prefers rental with a deposit to ownership type for residing elderly housing.

• Transactions of Materials Processing
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• v.7 no.3
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• pp.282-290
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• 1998

In bulk metal forming processes prediction of tool life is very important for saving production cost and achieving good material properties. Generally the service life of tools in metal forming process is limited to a large extent by wear, fracture and plastic deformation of tools. In case of hot and warm forging processes tool life depends on wear over 70%. In this study finite element analyses are con-ducted to warm and hot forging by adopting suggested wear model. By comparison of simulation and eal profile of die suggested wear model. By comparison of simulation and real profile of die suggested model is verified.

• 한국약용작물학회:학술대회논문집
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• 2009.05a
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• pp.161-162
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• 2009