• Proceedings of the KIEE Conference
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• 1995.07a
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• pp.315-317
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• 1995

A simple drive circuit without position sensors for a switched reluctance motor is presented. The turn on and turn off points are determined by detecting the rate of change of the active phase current. The drive circuit consists of a current sensing resistor, RC filter, comparator, OP Amp, and OR gates. It is verified through the experiments that the switched reluctance motor with the proposed sensorless drive circuit is well operated in wide speed ranges.

• Transactions of the Korean Society of Mechanical Engineers
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• v.18 no.9
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• pp.2265-2271
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• 1994

With the improvement of standard of living, requirement for comfortable and quiet environment has been increased and, therefore, there has been a many researches for active noise reduction to overcome the limit of passive control method. In this study, active noise control is performed in a duct system using intelligent control technique which needs not decide the coefficients of high order filter and the mathematical modeling of a system. Back propagation algorithm is applied as an intelligent control technique and control system is organized to exclude the error microphone and high speed operational device which are indispensable for conventional active noise control techniques. Furthermore, learning is performed by organizing acoustic feedback model, and the effect of the proposed control technique is verified via computer simulation and experiment of active noise control in a duct system.

• Proceedings of the KIEE Conference
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• 1995.11a
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• pp.235-237
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• 1995

The demands of minimizing the reactive power and reducing. the current harmonics are increasing nowadays. The inverter airconditioner needs high power and it operates with wide load range. Conventionally, ah huge LC passive filter is used in airconditioner to improve the P.F and to reduce current harmonics which doesn't gives good results. In this paper, a design of active power factor correction(PFC) circuit for inverter air conditioner is described. To improve the P.F and to reduce the THD, an average current controlled active PFC is designed and tested. Experimental results show that the developed system achieves almost unity P.F and low THD for all load range.

• Journal of Korean Academy of Nursing
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• v.13 no.2
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• pp.44-57
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• 1983

The explosion of the aging population is changing the social environment of today's older people. Traditionally in Korea, a large percentage(over 90%) of elderly parents have lived with their married first son. But today, the number of elderly who live with their married sons has decreased(65.6%) The number of those who live in a different situation such as with their married daughter, unmarried offspring, with a spouse or alone has increased (34.4%) We can expect that the number of the elderly who have to live in institution will increase. The objective of this investigation was to determine differences in the number of health Complaints of older people according to their living situation with a view to planning more effective health care. The sample consisted of 231 persons over 65 years of age, 60 living in an Old Age Home ana 171 living in their own home in Kwangju. Data were gathered from July 9 to 26, 1983 by nursing students using a Questionnaire which was a modified form of the Cornell Medical Index. The data were categorized according to the subjects, living, sex, educational level, previous occupation, hobbies and sexual activity. The date were analyzed for statistical significant differences using F and X²tests. findings included the following: 1. There was a higher number of health complaints from persons who live in the institution than those living at home, but the difference was not significant. 2. The highest number of health Complaints were from persons who live alone, followed by those living with their daughters, and then by those living in the institution. Persons who live with their sons had the least Complaints. The difference in the number of Complaints accord-ing to with whom they were living was significant. 3. Women had signincantly more Complaints than men. Persons who were not living with their spouses had significantly more complaints than those living with their spouses.4. The higher eductional level the persons had, the less health Complaints they had. The number of Complaints accoraing to educational level was significantly different. 5. The highest number of health complaints were from persons who had involved in Commerce and industry, followed by those in Agriculture. Persons who were civil servant had the least 6. There were more complains from persons who had no hobby than those with hobbies. The complaints. The difference was significant. difference was significant. 7. Persons who said they were sexually inactive had significantly more complaints than those who said they were sexually active. As age increased, sexual activity significantly decreased. Those who lived with their spouse were significantly more sexually active. 8. The highest number of Somatic Complaints were eye fatigue, followed by nocturnal frequency, lumbago, cramps in extremities, vertigo, stiffness in Shoulder, tinnitus, common cold and constipation. The order of Psychic Complaints from higher to lower were anger. sensitivity, anxiety, depression and loneliness. 9. This group of Elderly persons said they valued Health the most, followed by Harmony, Religion, Money and Honor.

• Proceedings of the KIPE Conference
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• 1998.10a
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• pp.677-682
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• 1998

A Single-phase Active Rectifier (SAR) [4-6] with high power factor capability is adopted to satisfy the international harmonic current standards such as IEC 1000-3-2. To minimize the input current distortion and to apply the control IC, such as FA5331, UC3854, ML4821 and so forth, the new adequate sensing circuits of the input voltage and current are proposed. There are tow methods applicable the SAR to inverter air-conditioner from the viewpoint of both efficiency and cost. The selecting methods of the passive components are presented for the two approaches. Using the determined components, the loss analyses are carried out. The prototype SAR circuits of these two approaches with 3kW power consumption are built and the operation and performance of the circuits with power factor correction capability are verified through the experimental results.

• Asian Oncology Nursing
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• v.12 no.1
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• pp.92-99
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• 2012

Purpose: The study was to examine the relationships between stress, ways of coping and burnout among family caregivers of cancer patients. Methods: Data were collected by self-reported questionnaires from 207 family caregivers of cancer patients at one university hospital and one general hospital in Busan, Korea. The instruments included a Stress Scale, a Ways of Coping Scale and a Burnout Scale. The collected data were analyzed using frequency, percentage, t-test, ANOVA, Scheffe's test, and Pearson's correlation coefficients with the SPSS WIN 19.0 program. Results: Stress was found to have significant relationships with age, relation to the patient, education, monthly income, degree of care-giving, financial burden and activities of daily living of patient. In active coping, there were significant differences according to education and religion. Passive coping was significantly related to gender. In burnout, there were significant differences according to age, relation to the patient, education, occupational status, monthly income, degree of care-giving, financial burden and activities of daily living of patient. Stress and burnout showed a positive correlation, while there was a negative correlation between burnout and active coping. Conclusion: These results suggest that promoting active coping would better support family caregivers of cancer patients in managing burnout effectively.

• Special Issue of the Society of Naval Architects of Korea
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• 2015.09a
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• pp.96-99
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• 2015

Norwegian Continental Shelf(NCS) is known as rich oil & gas reservoir and takes one third(1/3) of total continental shelf of Europe.(As of year 2013, Norway ranked third in the world in terms of exporting natural gas.) Until recent low oil price stream, development of oil & gas in NCS was active and perceived as profitable business. This paper describes study of living quarter fire protection for PSA AoC to prepare for likely increasing demands of offshore projects in NCS field.

• Korean Architects
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• s.639
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• pp.140-145
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• 2022

• Proceedings of the Polymer Society of Korea Conference
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• 2006.10a
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• pp.93-94
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• 2006

This lecture will present an overview of recent advances in our transition metal-mediated living radical polymerization, particularly focused on catalyst design and precision synthesis of functional polymers. Selected topics will include: (A) Design of Transition Metal Complexes: Evolution of Catalysts (B) New Ruthenium and Iron Catalysts: Active and Versatile (C) Functional Methacrylates for Advanced Functional Polymers (D) Functional Star Polymers: Microgel Cores for Metal Catalysts.

• Journal of the Korean Society of Clothing and Textiles
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• v.33 no.10
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• pp.1590-1600
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• 2009

This study investigates the fashion lifestyles and the effect on clothing purchase behavior by female consumers living in Mumbai India. Data were collected from 129 Indian women in their teens to thirties living in Mumbai and were analyzed by factor analysis, cluster analysis, one-way ANOVA, Duncan test, ${\chi}^2$-test, frequency analysis using SPSS 12.0. The results of this study are as follows. Five factors of fashion lifestyle are identified: fashion consciousness, price orientation, advertisement/brand orientation, being aware of others, and tradition orientation. Female consumers were classified into four groups based on fashion lifestyle factors: display/brand oriented group, active profit seeking group, fashion oriented group, and a tradition oriented group. There were significant differences among the fashion lifestyle groups on five criteria (latest fashion, price, commonality with existing clothing, size, and the distance to the store) out of the 13 criteria. The display/brand oriented group showed high scores on the latest fashion and size. The active profit-seeking group generally showed high scores on all five factors. The fashion oriented group showed high scores on latest fashion and commonality with existing clothing when buying clothes. Finally, the tradition oriented group showed high scores only on the distance to the shop, while they (the tradition oriented group) showed low scores on the other criteria. The examination on the actual conditions of clothing purchase among fashion lifestyle groups showed that only the monthly expenditure for clothing is significantly different. The display/brand oriented group and active profit seeking group spent more on clothing than the other two groups.