• 한국신뢰성학회지:신뢰성응용연구
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• 제7권4호
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• pp.163-172
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• 2007

Phenomenon, such as hardening, cracking or breaking etc.. of PVC tape for wiring harness by aging were detected on driven automobile in field. Hardening or cracking of PVC tape were confirmed decline of elongation by surrounding stress. The accelerated heat aging test was carried out applying temperature most important factor of aging, and then deduced an equation of useful life using arrhenius model. Prediction method of useful life of PVC tape was developed using miner rule calculating damage value by thermal energy classified temperature by matching deduced equation of useful life and measured temperature value on driven automobile in field.

• Environmental Engineering Research
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• 제13권1호
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• pp.41-48
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• 2008

The valuation of biodiversity is a fundamental step in conservation. The useful framework for analysing the economic value of biological resources is that of total economic value (TEV) and TEV comprises both use and non-use values, the former related to an actual use made of the resource, the latter to a willingness to pay for the resource independently of any use made of it. There are several valuation approacher in environmental economics literature. However, stated preference approach should be introduced for valuation of biodiversity because it can estimate non-use value as well as use value. Contingent Valuation and Conjoint Analysis are representative methods in stated preference and Conjoint Analysis can be more useful for valuation of biodiversity. Futhermore, the combination of ecology and economics to assess biodiversity leads to an integrated framework. Thus, interdisciplinary work is required, involving both economists and ecologists transferring elements or even theories and models from one discipline to another and transforming them for their specific, mutually consistent purpose.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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• pp.220-222
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• 1998

This paper presents a method, which develops an ability of Zero-phase Overcurrent Relay. Zero-phase current is very useful factor of Fault decision in Protect Relaying system. Actually, the setting-point value of Designed Relay, using Zero-phase current, is fixed. So in the case of deciding fault, Fixed setting-point value is not suitable for changing Load. and cause errors in Distributions system. For solving this problem, This paper proposes the Changed setting point value Algorithm, which can be adaptive for changing Distributions system using Zero-phase current r.m.s. indexes. The results of simulation under Load changing and High impedance fault show that proposed algorithm is useful for changing Distributions system and decreasing errors.

• 한국컴퓨터산업학회논문지
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• 제9권2호
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• pp.69-76
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• 2008

본 논문은 DSP보드에 캠코더의 NTSC 카메라로부터 획득한 칼라영상에서 휘도성분만을 추출한 후 비교적 간단한 영상 처리를 하여 카메라 렌즈의 초점 조절에 필요한 정보를 추출하여 자동으로 초점이 조절되는 시스템을 구현 하였다. 초점이 정확한 물체는 경계선이 뚜렷하다는 점을 이용하여 영상을 미분한 후 실험적으로 구한 초점조절에 유효한 값의 합이 증가하는 쪽으로 렌즈를 조절함으로서 영상에 적합한 초점을 얻을 수 있었다. 또한 잡음 성분에 해당하는 미분 값이 큰 값은 제외함으로서 보다 정착한 초점 값을 얻을 수 있었다.

• 한국의류학회지
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• 제26권3_4호
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• pp.548-559
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• 2002

본 연구에서는 소비자 측면에서 영향을 미치는 중요한 요소인 소비자 특성에 따라 소비후 과정이 달라지는 점에 주목하여 쇼핑가치에 따라 만족을 판단하는 과정에 어떠한 차이를 보이고 있는지를 알아보았다. 본 연구의 자료수집은 대학생을 대상으로 설문지 응답방식을 수집하였으며, 총 614부를 최종 자료분석에 사용하였다. 통계분석을 위하여 군집분석, t-test를 실시하였으며, 제시된 인과모형을 검증하기 위하여 공변량구조모형분석을 이용하였다.

• The International Journal of Costume Culture
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• 제5권3호
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• pp.184-203
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• 2002

This study considers the fashion as an expressive object of mental value system in order to understand muitivocal value groups. Because the external behavior aspects and internal values of muitivocal value groups are getting more ambiguous in these days. This purposes of this study are as follows; first, this paper examines diversely how these groups affect modern fashion through analysis multivocal value groups after 1990s, and makes clear that various social, cultural, and economical values are important factors for changing symbolic standard connected with fashion. Second, it aims at expanding the positive recognition of the conflicts that exist among various values, and aesthetical recognition that overcome the discrepancy and such conflicts. For this aim, this paper analyzes the social and cultural aspects, aesthetic taste, life style of such groups focusing on Dink, Yiffie, Yettie, Bobos. We examine these groups' characteristics and their effect on modern fashion by categorizing them into Snob Look, Vintage Fashion, Unbalance Fashion, and Caports Look. This paper conducts the previous literature review and the practical analysis on periodical publications and Internet websites concerning fashion. Consequently, this kind of study is useful for providing a theoretical background that would explain the multilateralism in fashion, with uncertain in useful and culture, and changing the obvious confusion to another dimension of order.

• 대한정형도수물리치료학회지
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• 제16권1호
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• pp.64-76
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• 2010

The sacroiliac joint is difficult to appropriately examine and treat because it is extremely complex and also is difficult to distinguish dysfunctions from those of the spine and hip which are highly intergrated functionally. In addition generally traditional x-rays and CT scans also are not beneficial in detecting sacroiliac joint dysfunction. The manipulative physiotherapist should seek to establish a series of relevant finding that build into a case implicating the sacroiliac joint. When deciding to use these diagnostic tests, the examiner must determine if the test will give reliable and useful information that will help in the diagnosis and subsequent treatment. To be useful diagnostic tests must give reliable data and be valid and the most useful methods of determining whether a test is a good test for pathology under consideration are sensitivity and specificity. In the ideal world, one would want a test that has both high sensitivity and high specificity. The purpose of this review is to ascertain diagnostic value on the tests for sacroiliac joint dysfunction by literature.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.576-580
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• 2008

Rubber material properties and useful life evaluation are very important in design procedure to assure the safety and reliability of the rubber components. In this paper, the evaluation of characteristics and useful life prediction of rubber component for elevator cabin were experimentally investigated. The material test and accelerated heat-aging test were carried. Rubber material constants were obtained by curve fittings of simple tension, pure shear and bi-axial tension test data. Heat aging test results changes as the threshold are used for assessment of the useful life and time to threshold value were plotted against reciprocal of absolute temperature to give the Arrhenius plot. By using the rubber material and component test several useful life prediction equations for rubber component were proposed. Predicted useful life of rubber component for elevator cabin agreed fairly with the experimental lives.

• Journal of the Korean Data and Information Science Society
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• 제18권4호
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• pp.1135-1143
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• 2007

The singular value decomposition and the spectral decomposition are the useful methods in the area of matrix computation for multivariate techniques such as principal component analysis and multidimensional scaling. These techniques aim to find a simpler geometric structure for the data points. The singular value decomposition and the spectral decomposition are the methods being used in these techniques for this purpose. In this paper, the singular value decomposition and the spectral decomposition are compared.

• 한국전기전자재료학회논문지
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• 제22권6호
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• pp.537-545
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• 2009

In this paper, new parameters were developed to estimate the depth of anesthesia during a general anesthesia using EEG. Power spectral density(PSD) analysis was used for these parameters because EEG became slow wave during anesthesia. The new parameters were DTR, ATR, TDR, ADR, BTR and BDR applied to PSD. These parameters were compared with SEF which is conventionally used at clinic and confirmed clinical value. As the results, DTR, ATR, TDR, ADR among parameters were not useful compared with SEF but BTR and BDR is valuable for clinic. 15 patents, at pre-operation BDR the value is $265.36{\pm}25.29$, at induction the value is $129.23{\pm}34.92$, at operation the value is $154.99{\pm}38.34$, at awaked the value is $283.83{\pm}39.80$ and at post-operation the value is $234.80{\pm}23.46$. Also at pre-operation BTR value is $183.38{\pm}13.59$, at induction the value is $104.09{\pm}25.11$, at operation the value is $115.38{\pm}23.42$, at awaked the value is $190.33{\pm}23.31$ and at post-operation the value is $172.38{\pm}19.08$. Trend of BDR and BTR is similar to change of SEF, so two parameters are useful. to estimate the depth of anesthesia.