• 조명전기설비학회논문지
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• 제27권3호
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• pp.100-106
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• 2013

In this paper, in order to analyze lightning impulse response characteristics in combined installations of SPDs and RCDs, surge protection coordination between SPDs and RCDs are experimentally investigated by using the combination wave generator. Six different types of single-phase residual current operated circuit-breakers with integral overcurrent protection for household and similar uses(RCBOs) being present on the domestic market are tested according to KS C IEC 61009-1 standard. As a result, when a class I SPD is located on the source side of an RCBO, all kinds of specimens are able to provide the proper coordination between the SPD and RCBOs without nuisance tripping, unintended operation or damage due to test impulse currents. However, in the case that the class II SPD is located on the load side of RCBOs, a lot of L-N mode injected currents is split into the RCBO, and a few RCBOs are damaged. Coordination between SPDs and RCDs is not valid and a role of SPDs is of no use. When combining SPDs with RCDs, it is necessary to select SPDs and RCDs in consideration of the protection voltage level of metal oxide varistor embedded in RCDs.

• 복식문화학회:학술대회논문집
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• 복식문화학회 2004년도 International Conference
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• pp.86-88
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• 2004

• Journal of Electrical Engineering and Technology
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• 제11권1호
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• pp.9-19
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• 2016

Accurate models of the characteristics of typical inverse-time overcurrent (OC) protective devices play an important role in the protective coordination schemes. This paper presents a novel approach to determine the OC protective device parameters. The approach is based on the Eigensystem Realization Algorithm which generates a state space model to fit the characteristics of OC protective devices. Instead of the conventional characteristic curves, the dynamic state space model gives a more exact fit of the OC protective device characteristics. This paper demonstrates the feasibility of decomposing the characteristic curve into smooth components and oscillation components. 19 characteristic curves from 13 typical and 6 non-typical OC protective devices are chosen for curve-fitting. The numbers of fitting components required are determined by the maximum absolute values of errors for the fitted equation. All fitted equations are replaced by a versatile equation for the characteristics of OC protective devices which represents the characteristic model of a novel flexible OC relay, which in turn may be applied to improve the OC coordination problems in the sub-transmission and distribution systems.

• Journal of the Korean Data and Information Science Society
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• 제19권4호
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• pp.1233-1246
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• 2008

This study examines characteristics of people who are experiencing severe hair loss problems. We focus on how these characteristics are related to their psychological problems, hair loss treatments, wig-wearing practices, and life styles. We gathered survey data from people who visited wig shops for their hair loss problems. The study shows that men and women have different characteristics in every aspect we consider.

• 한국의류학회지
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• 제42권1호
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• pp.58-73
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• 2018

This study examines the socio-cultural background of a Nerd-chic look, establishes a conceptual foundation for Nerd-chic look and examines its aesthetic characteristics in order to understand the latest modern fashion phenomenon. Nerd-chic look is a combination of 'nerd' as a popular collective style and 'chic', which refers to the aesthetic value of a costume style. It is a look that is expressed in fashion that reflects the contemporary aesthetic desires based on a nerd's external features and inner values. The aesthetic characteristics of the Nerd-chic look are as follows. First, the Nerd-chic look express the aesthetic characteristic of bricolage that transforms the familiar meaning of an outdated nerd style to 'chic' image by the rearrangement of the typical nerd style and retro fashion elements. Second, the Nerd-chic look express the aesthetic characteristic of supernormal, as a plain, restrained beauty based on the Normcore fashion mood, disassembly and recombination of ordinary items, fit-free styling, and asexual styling. Third, the Nerd-chic look expresses the aesthetic characteristics of deluxe poor, which rejects stereotypical and expensive luxury and presents a more contemporary and futuristic spirituality. It is expressed in oversized shapes that are not intended to fit the body and show incompatibility between fashion items or way of dressing.

• 패션비즈니스
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• 제26권3호
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• pp.138-154
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• 2022

The purpose of this study is to identify the characteristics of domestic American casual fashion trends using big data text mining analysis. 108,524 posts and 2,038,999 extracted keywords from Naver and Daum related to American casual fashion in the past 5 years were collected and refined by the Textom program, and frequency analysis, word cloud, N-gram, centrality analysis, and CONCOR analysis were performed. The frequency analysis, 'vintage', 'style', 'daily look', 'coordination', 'workwear', 'men's wear' appeared as the main keywords. The main nationality of the representative brands was Japanese, followed by American, Korean, and others. As a result of the CONCOR analysis, four clusters were derived: "general American casual trend", "vintage taste", "direct sales mania", and "American styling". This study results showed that Japanese American casual clothes are influenced by American casual clothes, and American casual fashion in Korea, which has been reinterpreted, is completed with various coordination and creative styles such as workwear, street, military, classic, etc., focusing on items and brands. Looks were worn and shared on social networks, and the existence of an active consumer group and market potential to obtain genuine products, ranging from second-hand transactions for limited edition vintages to individual transactions were also confirmed. The significance of this study is that it presented the characteristics of American casual fashion trends academically based on online text data that the public actually uses because it has been spread by the public.

• 한국건축시공학회지
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• 제18권1호
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• pp.67-79
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• 2018

이 논문은 프로세스 재설계 관점에서의 린 (lean) 개념의 이론적 변형과 BIM 프로세스 개선 사례를 제시한다. 최근에는 BIM을보다 효율적으로 사용하기위해 린 개념을 접목하는 연구들이 증가하고 있다. 린 이론과 성격과 기능은 제조업을 기반으로 하며 제조업에서의 프로세스는 린 개념의 프로세스 재설계 과정에 의해서 변형된 하나 프로세스로 개선된다. 하지만 제조 공정과 건설 공정은 다른 특성을 가지고 있다. 두 산업의 서로 다른 차이점으로 인해 전통적인 린의 프로세스 재설계 기능의 5 단계에는 이론적으로 BIM 프로세스에 그대로 적용하기에는 어려운 단계들이 포함되어 있다. 본 연구는 부분적으로 적용되는 린 개념의 접목을 해결하기 위해 제조 공정 및 BIM 프로세스의 특징을 분석했다. 이를 통해 이론적으로 린의 프로세스 재설계 단계를 수정하고 확장했다. 변형된 프로세스 재설계 단계는 설비전기 설계조율 프로세스에 적용했다. 본 연구에서 제안한 8단계의 프로세스 재설계 단계를 통해 일체화된 BIM 프로세스로 변형할 수 있었다. 또한 사례연구 결과는 공정 단계의 감소 및 비용절감의 가능성을 나타냈다. 본 연구의 결과는 BIM 프로세스 뿐만 아니라 다양한 프로세스에 접목될 수 있는 린 개념의 이론적 기초가 될 수 있다.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2011년도 춘계학술발표대회 논문집
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• pp.69-74
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• 2011

The purpose of this study is to give meaningful information about the coordination process in the construction of cooperative housing, hoping that the interest in this type of housing would spread wide in Korea. The Seongmisan village, a representative urban community village in Seoul, was studied in this study on the opinion coordination between residents and coordinators. For this qualitative research, 2 residents and 2 coordinators answered the 'open questionnaires' on the prior basic planning, land purchase, financing, architectural planning, construction & inspection, and the actual life thereafter. Following is the result. 1) The residents, in almost every step from the prior basic planning to the construction, had no sufficient information or knowledge especially in the legal or financial aspects. It explains why the coordinator has to participate in every step educating residents by means of the workshop or debate with professionals. 2) The construction cost was the most debated topic, which means that the cost has to be accurately projected by the coordinator. The confidence and success of the project stems from the accurate projection and transparent management of the construction cost.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2005년도 종합학술발표회 논문집 Vol.15 No.1
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• pp.125-130
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• 2005

This paper suggests an efficient method of protection ratio calculation and shows some calculated results applicable to frequency coordination in microwave relay system networks, and the net filter discrimination (NFD) associated with Tx spectrum mask and overall Rx filter characteristics has been examined to obtain the adjacent channel protection ratio. The protection ratio comprises several factors such as C/N of modulation scheme, noise-to-interference ratio, multiple interference allowance, fade margins of multi-path and rain attenuation, and NFD. According to computed results for 6.7 GHz, 64-QAM, and 60 km at BER $10^{-6}$, fade margin and co-channel protection ratio are 41.1 and 75.2 dB, respectively, In addition, NFD for channel bandwidth of 40 MHz reveals 28.9 dB at the first adjacent channel, which results in adjacent channel protection ratio of 46.3 dB. The proposed method provides some merits of an easy calculation, systematic extension, and applying the same concept to frequency coordination in millimeter wave relay system networks.

• 복식
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• 제59권9호
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• pp.115-130
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• 2009

A kind of Korean traditional jacket, Baeja, has been a Korean traditional costume equipped with practicality and formative aesthetics from the Three Kingdoms period to the Joseon Dynasty. Accordingly, the researcher of this study highly valued a modern sense of Baeja with various types of design and forms and attempted to make efforts to apply it into modern life. This study provided a new direction in the modernization work of traditional costumes by creating fashion images newly interpreted corresponding to a modern sense and trend through the application of formative characteristics and noticeable elements via the coordination of traditional Baeja and modern costumes. On the one hand, it would be meaningful in terms of contributing to the activation of traditional Hanbok by providing people with ample opportunities to wear it in modern daily lives variously. On the other hand, the actual purpose of this study was to perform a modernization work for traditional costumes by attempting to conduct a crossover that could let people move into other areas freely, that is, a creative and innovative research associating the area of costume history and that of coordination.