• 대한전기학회:학술대회논문집
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• 대한전기학회 1992년도 하계학술대회 논문집 B
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• pp.1133-1135
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• 1992

This paper describes high frequency inverter using zero voltage switching(ZVS). The ZVS operation is achieved to reduce the switching stress and switching loss under high speed switching. The proposed circuit configuration and performance are discussed. Its operation characteristics are evaluated through computer-aided simulation.

• 복식문화연구
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• 제9권3호
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• pp.357-374
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• 2001

This study analyzed the trends of fashion market in 15 branch stores of 3 major department stores in Seoul. The purposes of this study were to classify fashion zone and brands in each floor of the department stores, and to analyze the rate which a fashion brand was located department store. The results were as follows : 1. There were sundry goods on main floor, women\`s clothings on 2-4th floor, sports & golf wears and infants & children\`s clothings from 6th floor to the top in most department stores. 2. Lotte Chamshil branch had the largest number of fashion brands in it, the nest was Lotte Main store and followed by Hyundai Chunhoe branch, Shinsegae Gangnam branch, Hunndai Shinchun branch, Lotte Gangnam branch, Hyundai Main store, Hyundai Muyeuk-Center branch, and Lotte Youngdeungpo branch, etc. 3. The fashion categories of the Lotte Department stores were segmented as the Casuals (character, young, young basic, career, town, jean, city), Young worlds, Imported beautique, Madams, Designers(beautique), Intelligences, Unisex, Ladies formal wears, the Seasonables, and the Formals, Missy Careers. This was the most various fashion market segments among 3 major department stores. This store had 667 Women\`s fashion and Casual brands. The Chamshil branch and Main store were intensified the Casual & sundry goods on 5th floor. 4. The fashion categories of the Hundai Department stores were segmented as Women\`s wears, Women\`s casuals, Young-Adult, Young live, Women\`s former wears, Royal beautique and Young characters. It was less segmented than other Department stores. Total number of Women\`s fashion and casual brands were 471 brands. The market segmentation of fashion zone was well done at Chunho branch and Shinchun branch. It was intensified that Fashion sundry goods at Muyeuk-Center branch and The Women and Young fashion zone at Chunho branch. 5. The fashion categories of the Shinsaegae Department stores were segmented as Casuals (young, young character, X-, missy, career, character), Imported beautique, Designer\`s characters, Young basics, Elegance, Missy, Young weave, Original brands. This store had 304 Women\`s fashion and Casual brands. Shinsaegae has also developed it\`s own brand(PB items) and classified as the Original zone which differentiated it from other Departments. 6. The Deco was the most popular brand in the department stores, the next were Micha/Botticelli, and followed by Darks/System/lzzat Baba, Givy/Obzee/Lee won jae/Kim yeon Joo, and so on. The target of 6 out of 10 brands which were included in here were career women of age 20 to 30 ages. The price rate were from 200,000 won to 300,000 won.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제25권1호
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• pp.39-48
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• 2018

In this work, by applying the binomial expansion, some refinements of the Young and Heinz inequalities are proved. As an application, a determinant inequality for positive definite matrices is obtained. Also, some operator inequalities around the Young's inequality for semidefinite invertible matrices are proved.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.657-659
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• 2008

The purpose of this study is to investigate the characteristics of disaster preparedness for young children in educare curriculum and accreditation criteria. As a result, it is revealed that educare curriculum and accreditation criteria had the content of disaster preparedness for children. In addition, it is necessary to pay attention to the disaster preparedness for young children.

• Clinics in Shoulder and Elbow
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• 제24권1호
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• pp.27-31
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• 2021

A hemiarthroplasty with biologic resurfacing of the glenoid is one procedure that can be performed in young patients where total shoulder arthroplasty may be difficult. The authors introduced two cases in which this procedure was performed. This approach is one treatment option for young glenoid humeral arthritis patients that addresses some of the shortcomings of an isolated hemiarthroplasty.

• 한국지역사회생활과학회지
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• 제24권3호
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• pp.301-312
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• 2013

The purpose of this study was to investigate the differences between attentional networks according to sex and reflection-impulsivity in the cognitive styles of young children. The subjects of the study were 78 5-year-old children from the kindergarten or daycare center in Busan(with 40 in the reflection group, and 38 in the impulsivity group). The tests were conducted by using the Mating Familiar Test and the Attentional Network Test for young children. The study has used two independent t-tests to find out the differences between attentional networks according to sex, and reflection-impulsivity in the cognitive styles of young children. The results of this study were as follows. First, the boys with reflection cognitive style were significantly slower than the girls with the same style(t=2.18, p<.05). Second, young children with reflection cognitive style were significantly faster in the case of alerting effects than those with impulsivity cognitive style(t=-2.53, p<.05). The young children with reflection cognitive style were slower than those with impulsivity cognitive style in the case of orienting effect(t=2.04, p<.05). Children with a combination of both conflict effect and reflection cognitive style were significantly faster than those with impulsivity cognitive style(t=-2.89, p<.01). The results of the study suggested that there was a difference between attentional networks according to sex and reflection-impulsivity cognitive styles of young children.

• Geomechanics and Engineering
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• 제22권4호
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• pp.277-290
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• 2020

This paper presents an elastic-plastic solution for the circular tunnel of elastic-strain softening behavior considering the pressure-dependent Young's modulus and the nonlinear dilatancy. The proposed solution is verified by the results of the field measuring and numerical simulation from a practical project, and a published closed-form analysis solution. The influence of each factor is discussed in detail, and the ability of Young's modulus and dilatancy characterizing the mechanical response of surrounding rock is investigated. It is found that, in low levels of support pressure, adopting the constant Young's modulus model will seriously misestimate the surrounding rock deformation. Using the constant dilatancy model will underestimate the surrounding rock deformation. When adopting the constant dilatancy model, as the dilation angle increases, the range of the plastic region increases, and the surrounding rock deformation weakens. When adopting the nonlinear dilatancy, the plastic region range and the surrounding rock deformation are the largest. The surrounding rock deformation using pressure-dependent Young's modulus model is between those resulted from two constant Young's modulus models. The constant α of pressuredependent Young's modulus model is the main factor affecting the tunnel displacement. The influence of α using a constant dilatancy model is much more apparent than that using a nonlinear dilatancy model.

• 대한가정학회지
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• 제51권1호
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• pp.59-74
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• 2013

This research attempted to examine the effects of adult attachment which belongs to the psychological characteristics of the educare teachers on the behavior young children's adjustments through the educare teacher's self-efficacy and styles of discipline. To achieve this, a survey was conducted on 866 children aged 2-5 years attending 23 educare centers located in Seoul, the region of Gyeonggi and Gyeongsangbuk-do, and their 135 teachers in charge. The results of this research demonstrated that first, educare teachers' adult attachment had indirect effects on the young children's adjustments by the media of self-efficacy. Second, the educare teachers'adult attachment was found to have indirect effects on the young children's adjustments by the media of discipline styles. Third, the educare teachers' adult attachment was found to have effects on the young children's adjustments through self-efficacy and discipline styles. In conclusion, with regard to the effects of the educare teachers' adult attachment on the young children's adjustments the mediated effects of self-efficacy and discipline styles were confirmed. This research enables one to have an in-depth understanding of the process in which the educare teacher's psychological characteristics have important effects on the social and emotional development of young children and it is expected that it will become evidence data for realizing the need for developing practical educational programs regarding the character development and mental health of the educare teachers.

• Journal of Nutrition and Health
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• 제28권2호
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• pp.95-106
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• 1995

The effects of various n-6/n-3 ratios(about 2, 4, 6, 8) of dietary fatty acids on various lipid levels and prostaglandin production were studied at the constant P/S ratio (1.5-1.6) in young (5 weeks old) and adult(8 months old) Sprague-Dawley rats using palm oil, safflower oil and sardine oil. The concentration of serum cholesterol tended to increase with the increasing n-6/n-3 ratio. The tendency of HDL-cholesterol levels was similar to serum cholesterol levels. These were not apparent differences between young and adults rats. Serum triglyceride levels increased according to increasing n-6/n-3 ratio in young rats. These were generally high in the adult rats compared with the young rats. Though liver cholesterol level tended to increase according to the increasing n-6/n-3 ratio in the young rats. The liver triglyceride level did not change according to the n-6/n-3 ratio. However, these levels were apparently higher in the adult than in the young rats. The fatty acid compositions of phosphatidylcholine(PC) were similar in serum and liver. The arachidonate/linoleate ratios in tissue PC were influenced by the n-6/n-3 ratio. They tended to be lower in the adult rats compared with the young rats. It was suggested that the activity of $\Delta$6-desturase was decreased by aging. Production of platelet thromboxane A2(TXA2)and aortic prostacyclin(PGI2) was not apparently influenced with n-6/n-3 ratio. Whereas the ratio of TXA2/PGI2 was the lowest value at 3.8 of n-6/n-3 ratio, expecially in the young rats. Thus this ratio seemed to be a desirable level to protect atherosclerosis. These results indicate that the lipid level and prostaglandin production were influenced not only by n-6/n-3 ratio(under constant P/S ratio) but by aging, particulary triglycerde level and arachidonic/linoleic acid ratio.

• 한국산업융합학회 논문집
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• 제19권4호
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• pp.237-244
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• 2016

This paper investigates the possibility to increase the economic value of the thinned young apple trough fermentation process. It is studies the optimal fermentation condition of thinned young apple by manipulating preparation treatment and sugar content. To do this following steps are done. Firstly, different preparation treatment for thinned young apple such as whole apple, cutting apple, and blending apple were done. The different sugar content such as $24^{\circ}Brix$, $15^{\circ}Brix$ and $4^{\circ}Brix$ was added. Secondly, the sugar contents and pH level were measured during fermentation process. Finally, statistical analysis was used to examine the relation between the preparation treatment, sugar content and pH level during the fermentation process. The experimental result shows that the different preparation treatment influences to the fermentation process. The blending apple treatment gave lower pH level compared to other kind treatments. The sugar content of thinned young apple was decrease during the fermentation process. The statistical analysis shows that the manipulation preparation treatment and sugar content affect the final pH level and whole fermentation process. Experimental result shows that the thinned young apple fermentation could be proposed as new alternative product in the market. The best fermentation process was obtained from blending thinned young apple treatment with $24^{\circ}Brix$.