• Proceedings of the KIEE Conference
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• 1997.07c
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• pp.797-799
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• 1997

This paper presents an operation and planning model of integrated energy systems which consist of small scale cogeneration systems, thermal accumulator, ice storage and electrical energy storage systems. In the proposed planning model, an optimization of total cost which contains investment, operation, thermal shortage and salvage costs has carried out with the maximum principle based on the lifetime of each system component and unit price per capacity. From this model, optimal investment capacity per annum can be determined during the studied periods using the marginal costs according to the operation characteristics of each system component.

• The Journal of the Korea Contents Association
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• v.13 no.12
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• pp.357-368
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• 2013

This research explores the efficiency of social welfare expenditure in Korea by analyzing marginal productivity, scale economies, and elasticity of substitution that could be obtainable from a production function. By virtue of VES production function, such productive indicators are easily identified. If once the efficiency is revealed in the production process, it brings to a positive impact to increase the level of income. Empirical evidences are shown that the public expenditure is operated systematically in comparing with the private one. This is mainly due to the fact that the system of the public sector is well-established. It implies that an operational system for the private sector ought to be built up in a short period of time. Otherwise, increasing in expenditure by a private sector would not be helpful to improve efficiency in the production side. Accordingly, level of income.

• Archives of Craniofacial Surgery
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• v.20 no.6
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• pp.354-360
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• 2019

Background: Keloids are benign fibro-proliferative lesion, related to excessive inflammatory reactions in certain anatomical areas, including the auricles. Their specific etiology remains unclear; nonetheless they exhibit tumor-like characteristics of significant recurrence and cause emotional distress, even with various treatment strategies. We applied intermittent magnetic pressure therapy on ear keloids in combination with surgical excision, and present its effectiveness herein. Methods: Ear keloid patients were treated with surgical excision followed by magnetic pressure therapy. The keloid tissues underwent excision and keloid marginal flaps were utilized for wound closure. Intermittent magnetic pressure therapy was applied 2 weeks after the surgical procedure. The pressure therapy consisted of a 3-hour application and 2-hour resting protocol (9 hr/day), and lasted for 6 months. The results were analyzed 6 months after the therapeutic procedures, using the scar assessment scale. Results: Twenty-two ear keloids from 20 patients were finally reviewed. Among the keloids that completed the therapeutic course, 20 ear keloids out of 22 in total (90.9%) were successfully eradicated. Two patients (2 keloids) exhibited slight under-correction. Postoperative complications such as wound dehiscence or surgical site infection were not noted. The scar assessment scale demonstrated a significant improvement in each index. The intermittent pressure therapy led to patient compliance, and avoided pressure-related pain and discomfort. Conclusion: Excision followed by intermittent pressure application using a magnet successfully reduced the burden of fibro-proliferative keloids, and had good patient compliance. The role of intermittent pressure application and resting should be studied with regard to keloid tissue remodeling.

• Journal of Fisheries and Marine Sciences Education
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• v.22 no.1
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• pp.123-140
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• 2010

The Purpose of this study was to examine the effects of self-growth group counseling on self-esteem and life satisfaction of university students. For this study the following hypotheses were established. First, does the self-growth group counseling enhance significantly the participants' self-esteem? Second, does the self-growth group counseling enhance significantly the participants's life satisfaction? Those who participated in this study were 22 University students which are in D University in Busan. Ten participants were assigned in the experimental group and twelve in the control group. The experimental group participated in the self-growth group counseling one session a week for 12 consecutive weeks held by counseling center for D University students. The instruments used in this study were Self-Esteem Scale and life satisfaction Scale. The data was analysed by ANCOVA. The average, standard deviation, and estimated marginal means were calculated and the differences between the pre and post-tests calculated, processed by SPSS 12.0. The major findings of this study can be summarized as follows: First, the self-growth group counseling is effective to enhance significantly the level of self-esteem of University students. Second, the self-growth group counseling is also effective to enhance the level of life satisfaction of University students. Based on the results, the self-growth group counseling was suggested as a means to help University students enhance their self-esteem and life satisfaction.

• Journal of Technologic Dentistry
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• v.38 no.4
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• pp.327-342
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• 2016

Purpose: The purpose of this study was to investigate the cognition of denture fabrication activities and its cost in National Health Insurance for elderly denture. Methods: A self-administered questionnaire was completed by 41 dental laboratories' owner who was research subjects of HIRA(Health Insurance Review & Assessment Service)'s policy research for elderly denture in 2011. The questionnaire consisted of general characteristics of the subjects, dental technicians' knowledge of national health insurance coverage of elderly denture, job-related changes after national health insurance coverage of elderly denture including validity of denture fabrication activity classification and the cost for each service. Each question was measured by Likert 5 point scale or frequency. The collected data were analyzed by SPSS 16.0. Results: Most of the research subjects had been fabricating national health insurance coverage denture(92.7%), also had ample knowledge of national health insurance coverage denture for elderly. Job-related changes after national health insurance coverage of elderly denture revealed marginal differences in the quality. The validity of fabrication activity classification of resin based complete denture was $3.71{\pm}1.023$ by Likert 5 point scale. Conclusion: The goal of national health insurance for elderly denture is to promote elderly's health and well-being. To fabricate denture is a very important part of the denture treatment. For this reason, denture fabrication activity classification and the cost analysis plan should be duly reflected in the policy of national health insurance for elderly denture.

• Journal of Yeungnam Medical Science
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• v.35 no.2
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• pp.205-212
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• 2018

Background: Brain volume is associated with dementia and depression in the elderly. An easy way to predict relative brain volume is to measure head circumference. In this study, we investigated the relationship between head circumference and cognition as well as depression in a non-demented elderly community. Methods: Baseline and follow-up surveys were conducted in 2007 and 2010. At baseline, community residents aged 65 years or over (n=382) within a rural area of South Korea were screened for dementia and symptoms of depression and were followed using the same screening battery after 3 years (n=279). Data from anthropometric measurements (head circumference, height, and body weight), demographics, and blood tests were gathered. Neuropsychological tests, including the Korean version of mini-mental state examination (K-MMSE), clinical dementia rating (CDR) including the CDR-sum of boxes, the Korean version of instrumental activities of daily living, and geriatric depression scale (GDS), were performed. None of the 279 subjects followed were demented. Results: Baseline performance on the K-MMSE and GDS was poorer for participants with smaller head circumferences. Follow-up performance on the MMSE was also poorer for participants with smaller head circumferences. Interestingly, participants with smaller head circumference showed worse GDS scores at baseline but on follow-up examination, participants with larger head circumference showed rapid worsening than those with smaller head circumference with marginal significance by ANOVA test. In regression coefficient analysis, GDS decline showed significant difference. Conclusion: Head circumference was not associated with cognitive change but was associated with symptoms of depression in non-demented community residents.

• Journal of the korean society of oceanography
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• v.31 no.4
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• pp.164-172
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• 1996

CREAMS (Circulation Research of the East Asian Marginal Seas) Expeditions have provided a rare opportunity to carry out precise measurements of salinity, temperature and chemical tracers extensively in all major basins of the East Sea (Japan Sea) in 1993-1996 for the first time in more than 60 years since Uda's investigation (Uda, 1934). Studies revealed unequivocal evidence that the East Sea Proper Water (ESPW), previously known as a single homogeneous water mass, is indeed made of several distinct water masses. CREAMS data further confirmed the earlier observations of Gamo et al. (1986) that properties in Deep Waters in the East Sea have been changing during at least the last 25 years. There is evidence, especially from the analysis of the DO profile, that these changes may result from a major change in the mode of deep water formation: from bottom water formation in the past to intermediate/deep water formation in recent years. The causes for these changes are not clear at the present time, but nay include natural variation and may also reflect recent global changes in regional scale. A moving-boundary box model is presented to describe current observations, predicting the turnover time of the total deep and bottom waters to the cold surface waters to be ${\sim}$80 years in 1996.

• Journal of the Korean Institute of Navigation
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• v.7 no.1
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• pp.1-32
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• 1983

The delay due to congestion has recently attracted widespread attention with the analysis of over-all operation at the port. But, the complexity of the situation is evident in view of the large number of factors which impinge on the considerable end. Queueing theory is applicable to a large scale transportation system which is associated with arrivals of vessels in a large port. The attempt of this paper is to make an extensive analysis of the port transport system and its economic implications from the viewpoint that port is one of the physical distribution facilities and a kind of queueing system which includes ships and cargoes as port customer. By analyzing the real data on the Port of Pusan, it is known that this port can be represented as a set of multi-channel with identical setof Poisson arrival and Erlang service time, and also it is confirmed that the following formula is suitable to calculate the mean delay in this port, namely, $W_4={\frac{\rho}{\lambda(1-\rho)} {\frac{e_N(\rho{\cdot}N)}{D_{N-1}(\rho{\cdot}N)}$ where, ${\lambda}$: mean arrival rate $\mu$: mean servicing rate; N: number of servicing channel; ${\rho}$: utillization rate (${\lambda}/N{\mu}$) $e_N$: the Poisson function Coming to grips with the essentials of the cost of delay due to congestion, a simple ship journey cost model is adopted and the operating profit sensitivity to variation in port time is examined, and for purpose of a future development for port princing service the marginal cost is approximately calculated on the basis of queueing theory.

• Korean Journal of Ichthyology
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• v.2 no.1
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• pp.28-35
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• 1990

The genus Periophthalmus collected from the west and south coasts of Korea, from 1983 to 1987 is reviewed and discussed taxonmically. Among them, Periophthalmus sp. is distinguished morphologically from P. cantonensis and other species of the genus Periophthalmus. The external features of Periophthalmus sp. are similar to those of P. cantonensis. However, it is clearly observed that Periophthalmussp. is differ from P. cantonensis in marginal band and height of 1st dorsal fin, membrane of pelvic fin, number of longitudinal scale~and number of 2nd dorsal soft rays.

• Structural Engineering and Mechanics
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• v.39 no.6
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• pp.813-831
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• 2011

This paper presents an efficient version of Hilbert-Huang transform for nonlinear non-stationary systems analyses. An ensemble empirical mode decomposition (EEMD) is introduced to alleviate the problem of mode mixing between intrinsic mode functions (IMFs) decomposed by EMD. Yet the problem has not been fully resolved when a signal of a similar scale resides in different IMF components. Instead of using a trial and error method to select the "best" outcome generated by EEMD, a hybrid algorithm based on EEMD and EMD is proposed for multi-mode signal processing. The developed approach comprises the steps from a bandpass filter design for regrouping modes of the IMFs obtained from EEMD, to the mode extraction using EMD, and to the assessment of each mode in the marginal spectrum. A simulated two-mode signal is tested to demonstrate the efficiency and robustness of the approach, showing average relative errors all equal to 1.46% for various noise levels added to the signal. The developed approach is also applied to a real bridge structure, showing more reliable results than the pure EMD. Discussions on the mode determination are offered to explain the connection between modegrouping form on the one hand, and mode-grouping performance on the other.