• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.18 no.7
• /
• pp.394-399
• /
• 2017

In Korean AC power railway substations, SCOTT winding transformers are under operation to have a single phase power supply together with a phase angle of $90^{\circ}$ on the secondary side of the main transformer. In the case of an internal fault of the transformer, the transformer protection relay should be cut off on the primary side, the transformer should be inoperative to the external fault of the transformer or to the normal train operation. Reducing the malfunction of the relay through an exact fault determination is very important for securing a stable power system and improving its reliability. The main transformers are protected using Buchholtz's relay and a differential relay as the internal fault detection devices, but there are some cases of the main transformer operation under the deactivation of this protection function due to a malfunction of the differential relay. In this paper, the characteristics of the SCOTT transformer and differential relay as well as the malfunctioning of the protection relays are presented. The modeling of the SCOTT transformer protection relay was accomplished by the power system analysis program and the Comtrade file from 'A substation', which was used as the input data for the fault wave, and the harmonics were analyzed to determine if the relay operates or not. In addition, an improvement plan for malfunctioning cases through wave form analysis is suggested.

• Horticultural Science & Technology
• /
• v.31 no.2
• /
• pp.203-210
• /
• 2013

This study was conducted to investigate the optimum storage temperature and the effect of 1-methylcyclopropene (1-MCP) on the postharvest physiology and quality of plumcot (Prunus salicina Lindle. ${\times}$ Prunus armeniaca L.) 'Harmony' fruits. plumcot fruits were stored at 0, 5, 10, and $20^{\circ}C$, respectively, with three different ripeness stages grouped by skin color development. Furthermore, we treated $1{\mu}L{\cdot}L^{-1}$ 1-MCP was treated at $10^{\circ}C$ for 17 hours and stored at $10^{\circ}C$ for 12 days to evaluate the effectiveness for better shelf-life. The results indicated that lower storage temperature than room temperature effectively reduced the respiration rate with delaying quality changes. While, the fruits showed worse fruit taste than the fruits stored at 10 and $20^{\circ}C$. Reversely, the fruits stored at $20^{\circ}C$ showed more respiration rate and ethylene production. 1-MCP treatment effectively reduced the skin red color development, ethylene production, $CO_2$ and softening of plumcot 'Harmony' fruits. Overall data indicated that the optimum harvest time and storage temperature could be 30-50% red color and near $10^{\circ}C$. Postharvest 1-MCP application at the level of $1.0{\mu}L{\cdot}L^{-1}$ could maintain fruit quality well in plumcot fruits.

• Journal of the Korean Geosynthetics Society
• /
• v.17 no.4
• /
• pp.169-177
• /
• 2018

Glass fiber reinforced polyester (GFRP) composites are widely used as structural materials in harsh environment such as underground pipes, tanks and boat hulls, which requires long-term water resistance. Especially, these materials might be damaged due to delamination between gelcoat and composites through an osmotic process when they are immersed in water. In this study, GFRP laminates were prepared by surface treatment of UPE (unsaturated polyester) gelcoat by vacuum infusion process to improve the durability of composite materials used in underground pipes. The composite surface coated with gelcoat was examined for surface defects, cracking, and hardness change characteristics in water-immersion environments (different temperatures of $60^{\circ}C$, $75^{\circ}C$, and $85^{\circ}C$). The penetration depth of cracks was investigated by micro CT imaging according to water immersion temperature. It was confirmed that cracks developed into the composites material at $75^{\circ}C$ and $85^{\circ}C$ causing loss of durability of the materials. The point at which the initial crack initiated was defined as the failure time and the life expectancy at $23^{\circ}C$ was measured using the Arrhenius equation. The results from this study is expected to be applied to reliability evaluation of various industrial fields where gelcoat is applied such as civil engineering, construction, and marine industry.

• 프린팅코리아
• /
• v.11 no.9
• /
• pp.86-91
• /
• 2012

월드컵과 함께 자구촌 최대의 스포츠 축제로 꼽히는 올림픽에는 여러 가지 상징이 활용된다. 대회 개막을 알리는 성화는 폐막까지 불꽃을 피우고, 심볼인 오륜기는 기간 내내 모든 경기장에 나부끼며, 각 경기의 수상자에게는 증표로 메달이 수여된다. 그리고 경기장을 비롯해 눈길이 갈 만한 대부분의 장소에는 엠블럼과 마스코트, 포스터가 오가는 이의 눈길을 사로잡는다. 1세기를 넘긴 올림픽의 역사만큼 포스터, 엠블럼, 마스코트도 변화무쌍한 진화를 해왔다. 올림픽 인쇄물의 꽃이라 할 수 있는 포스터를 통해 116년 올림픽의 역사를 되짚어본다.

• 월간낙농육우
• /
• s.94
• /
• pp.67-72
• /
• 1990

인류의 역사와 더불어 생명을 이어온 쥐는 마치 친척처럼 가까이 여겨 미키마우스와 같이 예쁜 마스코트로 승화되기도 하고 인류 파멸의 원흉으로 여겨지기도 한다. 실제로 양축가 입장에서의 쥐는 곡물에 미치는 피해는 물론 오제스키 등과 같은 질병의 감염원이 되기도 하는 등 실로 많은 손실을 우리 양축가에게 안겨주고 있다. 이에 필자는 갖가지 쥐에 대한 정보 및 그 습성 또 구서제의 여러 가지 특징을 나열하여 양축에 직$\cdot$간접으로 미

• KOREAN POULTRY JOURNAL
• /
• v.11 no.11 s.121
• /
• pp.70-73
• /
• 1979

우리 몸에 좋은 닭고기는 섬유질과 염분이 적어 육류 중에서 가장 소화가 잘 되며 또한 지방질은 다른 육류보다 훨씩 불포화 상태여서 콜레스테롤 성분을 적게 섭취해야하는 식이요법에 적합하다. 값도 싸고 요리법도 다양하며 영양분이 풍부한 이들 닭에 찬사를 보내며 리더스 다이제스트 79년 10월호의 잭 덴턴 스코트의 글과 함께 한국의 양계역사를 게재한다.

• 건강소식
• /
• v.36 no.5
• /
• pp.14-15
• /
• 2012

배우 데뷔작인 민중극단의 "꿀맛'이 1975년 작이니 벌써 37년 차다. 영화 '봄, 눈' 홍보로 몸이 열두 개라도 모자란다며 아이처럼 찡그리기도 했지만, 인터뷰에 들어가자 이내 노련한 '대' 배우로 변신했다. 연기 신념을 이야기할 때는 사뭇 진지했지만, 사적인 얘기가 나오면 소탈하게 웃었다. "나도 파자마 바람에 코트 달랑 걸치고 아이 학교 데려다 주는 엄마."라며 웃는 배우 윤석화(56)를 만났다.

• Proceedings of the KSME Conference
• /
• 2004.11a
• /
• pp.498-503
• /
• 2004

A fundamental function of court sport shoes has been considered as the protection of human feet from unexpected injuries. But, recently its role for improving the playing competency is being regarded as a more important function. In connection with this situation, intensive efforts are being world-widely forced on the development of court sport shoes proving the excellent playing competency, by taking kinesiology and biomechanics into consideration. However, the success of this goal depends definitely on the shoes design based upon the reliable evaluation of shoes functional parts. This paper addresses the application of finite element method to the evaluation of landing impact force of court sport shoes. In order to reflect the coupling effect between leg and shoes accurately and effectively, we construct a fully coupled shoes-leg FEM model which does not rely on the independent experimental data any more. Through the numerical experiments, we assess the reliability of the coupled FEM model by comparing with the experimental results and investigate the landing impact characteristics of court sport shoes.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.36 no.8
• /
• pp.814-827
• /
• 2012

This study analyzed the presentation trend of a checklist method for trench coat designs. Through this analysis, this study examined the flow of trench coat designs and presents future design directions. Research was conducted in the following method. A total of 1,307 female trench coat photos were selected from the photos presented in the top 4 collections from 2006 to 2011. These photos were used for analysis and frequency analysis was conducted. Among the checklist methods presented in trench coats, the modification type was most common, followed by the elimination type, conversion type, combination type, minimization type, addition type, and magnification type, respectively. Checklist methods were continuously presented even while increasing and decreasing according to the year and season. This showed that it was highly possible for checklist methods to be continuously applied in future trench coat designs. Generally, a high frequency of appearance was shown in 2010 and during the F/W season. According to the development direction of future trench coat designs applied with the checklist method, it is predicted that the modification type and the elimination type (which have generally displayed high appearance frequency) will be continuously magnified in the future. In particular, it is expected modifications in structural details (which have showed an upward trend in 2011) will be further magnified.

• Journal of the Korea Fashion and Costume Design Association
• /
• v.8 no.2
• /
• pp.145-157
• /
• 2006

The purpose of this study is to suggest new designs and patterns for men's coat by deconstructing and restructuring 18th and 19th century men's coat. In the postmodern society, the reinterpretation of the past fashion trends or items through extensive historical investigation has been frequently used as new design motifs and the new source of creative fashion design. Especially in the contemporary society, as multifarious forms and presentations are emphasized even in the men's fashion, it is urgently required more than ever to do thorough and extensive research for the design and structure of men's fashion. Therefore, through historical research on men's fashion, the 18th and 19th century men's coat, which is generally considered to be the most developed one in the concept and shape of 'coat,' has been reinterpreted and deconstructed to make new design for men's coat which corresponds to the trends and sensibility of contemporary fashion. In addition to this, to facilitate practical use of this new design by fashion public, the plane patterns for the actual production of these coat designs were presented.