• Title/Summary/Keyword: 지효성

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전(電)력질주 - 효성 전력 퍼포먼스유니트

  • 대한전기협회
    • JOURNAL OF ELECTRICAL WORLD
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    • s.450
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    • pp.72-77
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    • 2014
  • 1962년 당시 중공업 불모지였던 이 땅에 본격적인 중공업 시대를 개막한 효성은 반세기를 훌쩍 넘긴 오늘에 이르기까지 끊임없는 변화와 개혁을 통해 세계적인 기업으로 발전해 왔다. 중전기기 신제품 개발에 힘을 기울여온 효성의 발자취는 우리나라 전력산업의 발전과 궤를 같이 하고 있다고 할 정도로 효성은 국내 전력산업사(史)에 있어 빼놓을 수 없는 존재이다. 154kV 환상망 구축사업의 중추적 역할 수행, 345kV 전력기자재 최초 납품, 765kV 초고압 변압기 국내 최초 개발 및 수출, 800kV급 2점절 초고압 차단기(GIS, Gas Insulated Switchgear) 세계 최초 개발, 1,100kV 극초고압 GIS 국내 최초 순수 독자 개발 등 효성의 초고압 분야는 화려한 역사를 자랑한다. 그러나 최근 들어 세계 초고압 분야의 시장 성장세가 둔화되고 있다. 이에 비단 효성 뿐 아니라 국내 초고압 관련 기업들의 움직임도 주춤한 상태다. 문제는 이러한 난관을 어떻게 빨리 헤쳐 나가느냐에 있는데, 효성이 선택한 방법은 '고객제일주의'와 '신기술 개발'이다. 이는 기본 중의 기본이지만, 이 기본을 준수하기가 얼마나 어려운지는 모두 알 것이다. 즉 50여년 전 아무 것도 없는 중공업 분야에서 새로운 역사를 창조하겠다던 '초심'으로 돌아가 지금부터 다시 새 역사를 써나가겠다는 의지를 불태우고 있는 것이다. 그 중심에 우뚝 서 효성의 초고압 전력 분야를 책임지고 있는 전력 퍼포먼스유니트를 소개한다.

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Utilization of Fly Ash as a Source of Mineral Fertilizers -IV. Development of Slowly Released K Fertilizer (Fly Ash 비료화(肥料化) 연구(硏究) -IV. Fly Ash를 이용(利用)한 지효성(遲效性) 가리(加里) 비료(肥料) 개발(開發))

  • Shin, Jae-Sung;Seong, Ki-Seog;Choi, Du-Hoi
    • Korean Journal of Soil Science and Fertilizer
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    • v.27 no.1
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    • pp.10-14
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    • 1994
  • The slowly released potassium fertilizer was developed by mixing fly ash with KOH, anthracite coal powder, KCI, $K_2CO_3$ and $Mg(OH)_2$ as the substances for accelerating calcination. Measuring proper ratios of raw materials, we found that the anthracite coal powder was 12 percent and $Mg(OH)_2$ was two to three percent. The optimal calcination temperature and time were proved to be $850^{\circ}C$ and 30 minutes, respectively, however, the trial product with lower temperature and shorter time in calcination had low quality. The K solubility of the product was very low compared to that of the KCl fertilizer.

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Toxicity Evaluation of Agricultural Insecticides on Workers of Pharaoh Ant, Monomorium pharaonis (Hyme-noptera : Formicidae) (애집개미 (Monomorium pharaonis) 일개미에 대한 농업용 살충제의 독성평가)

  • Kang, Shin-Ho;Han, Jong-Been;Park, Shin-Sub;Kim, Gil-Hah
    • The Korean Journal of Pesticide Science
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    • v.10 no.3
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    • pp.218-224
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    • 2006
  • Toxicities of 34 agricultural insecticides was tested against Monomorium pharaonis workers by diet dipping method. Ten insecticides among them, bifenthrin, chlorpyrifos, chlorpyrifos-methyl, cypermethrin, dichlorvos, fenthion, fenitrothion, methidathion, pirimifos-methyl, and phenthoate showed 100% rapid mortality. $LC_{50}$ (ppm) values of selected insecticides were appeared on the order of pirimifos-methyl (0.33), chlorpyrifos-methyl (0.76), phenthoate (1.70), bifenthrin (1.78), dichlorvos (2.50), cypermethrin (9.92), chlorpyrifos (22.21), fenitrothion (36.58), fenthion (40.96), and methidathion (64.34). $LT_{50}$ (day) values by diet dipping method showed that dichlorvos, benfuracarb and cypermethrin acted more rapid than boric acid and hydramethylnon. The values of the former three were 0.25, 0.38 and 0.27 days, and those of the latter two were 3.4 and 2.6 days, respectively. In persistance effect tests, chlorpyrifos-methyl, fenthion and methidathion showed over 90% insecticidal activity for 13 days.

시.도회장 인터뷰(9) - "회원사 경영환경 개선 위해 최선을 다하는 강원도회"

  • 대한설비건설협회
    • 월간 기계설비
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    • s.259
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    • pp.40-42
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    • 2012
  • 제8대 시 도회장이 새롭게 구성됨에 따라 전국 시 도회가 시 도회장을 중심으로 본격적인 활동에 들어간 지 한 해가 지났다. 본지는 향후 임기동안 시 도회를 이끌어 갈 전국 시 도회장으로부터 사업계획을 들어 보는 자리를 마련해 연재하고 있다. 이번호에는 활달한 성격으로 넓게 분포된 강원지역 회원사를 아우르는 장효성 강원도회 회장을 만나보았다.

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Mono-granular Compound Fertilizer Acting Slow Release for the Crops Under Vinyl Mulching Cultivation -I. Effect of formulation and granulation on slow release (비닐멀칭작물재배용(作物栽培用) 지효성(遲效性) 전용복비(專用複肥) 개발(開發) -I. 제립(製粒)이 지효성(遲效性)에 미치는 영향(影響))

  • Shin, Jae-Sun;Lim, Dong-Kyu;Seong, Ki-Seog;Kim, Bok-Jin
    • Korean Journal of Soil Science and Fertilizer
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    • v.20 no.2
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    • pp.97-100
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    • 1987
  • Medium grade mongranular compound fertilizers for the crops under vinyl mulching cultivation were formulated using the principal materials of urea, DAP and MOP in combination with various fillers of zeolite, gypsum and treated human waste and granulated with waste liquid of glutamic acid fermentation as binder. The ratios of $N-P_2O_5-K_2O$ of trial products were 12-10-11.5 for red pepper, 8-8-6 for sesame and 4-9-14 for peanut. The rate of dissolution of trial products was comparatively low in water. The product for red pepper had N dissolution rate of 80 percent during 24 hrs. 70 for peanut and 55 for seasame. The optimum dissolution rate has reported to be 50 percent by the standard laboratory dissolution test for 24 hrs. in water. Therefore, the slowly released characteristics were obtained with the products that had 24 hrs. dissolution of 70 to 60 percent. One time basal application of trial products could readily be justified under muching cultivation.

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The Influence of LMX and TMX on team effectiveness and team performance in Airline cabin crew team (항공사 객실승무원 팀제에서의 LMX와 TMX가 팀유효성과 팀성과에 미치는 영향연구)

  • You, Jung-Yun;Lee, Mi-Hye
    • Journal of Advanced Navigation Technology
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    • v.16 no.6
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    • pp.1052-1064
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    • 2012
  • In this study for the purpose of providing the basic data for airline cabin service improvement and efficient crew management. The relationship on team effectiveness and team performance according to the quality of airline cabin crew team LMX(Leader-Member Exchange) and TMX(Team-Member Exchange) was verified. The findings from the analysis shows the closer team leader and team members have quality exchange relationship the more the cabin crews will team commitment and team satisfaction. The conclusion is drawn that increased team effectiveness(satisfaction and commitment) enhances team performance as well. Therefore, based on the results of the study on airline cabin crew team operation system, the team leader and team members should come up with specific scheme to establish quality exchange relationship and to maintain the relationship.

Diagnosis of State Of Health(SOH) for Battery Management System(BMS) (축전지관리시스템(BMS)을 위한 건강상태(SOH) 진단방법)

  • Song Jin-Wan;Kim Hyo-Sung;Lee Ben
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.266-269
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    • 2006
  • 현대사회에서 축전지라 불리우는 2차 전지는 그 용도가 중요하지만, 비선형적이고 다양한 파라메타에 따른 복잡한 특성 때문에 그 사용법에 있어서 발전에 제한을 받아왔다 [1][2]. 각 배터리셀의 건강상태(SOH)를 실시간으로 정확히 파악하는 것은 장비의 안정된 운전과 원활한 축전지관리를 위하여 필수적이다. 본 논문에서는 축전지의 내부컨덕턴스를 측정하는 간접적인 방법에 의하여 장비의 운전이나 축전지의 수명에 영향을 주지 않고 축전지의 건강상태(SOH)를 실시간으로 진단하는 방법을 제시하고, 실제로 120개의 축전지에 대한 컨덕턴스 자료에 의하여 건강상태를 진단하고 교체시기를 판단한다.

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Hybrid LVDC Circuit Breakers (저압직류용 하이브리드 차단기)

  • Hyo-Sung, Kim
    • The Transactions of the Korean Institute of Power Electronics
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    • v.27 no.6
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    • pp.489-497
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    • 2022
  • This work investigates the commutation characteristics of the current flowing through an electrical-contact-type switch to the semiconductor switch branch during the breaking operation of hybrid DC switchgear. A simple, reliable, low-cost natural commutation method is proposed, and the current commutation characteristics are analyzed in accordance with the conduction voltage drop of the semiconductor switch branch through experiments. A prototype 400 V/10 A class natural commutation type hybrid DC switchgear is set up. Its performance is verified, and its characteristics are analyzed.

Gas Production of Chemical Leavening Agents and Effects on Textures of Cookies (화학 팽창제의 가스 발생과 쿠키의 텍스쳐 비교)

  • Yang, Seong-Yeon;Kim, Sang-Yong;Jang, Kyu-Seob;Oh, Deok-Kun
    • Korean Journal of Food Science and Technology
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    • v.29 no.6
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    • pp.1131-1137
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    • 1997
  • The production rates of leavening gases and textures of cookies were investigated with various chemical leavening agents(baking powders). The chemical leavening agents could be divided into three group of a fast-acting group such as potassium bicarbonate, tartaric acid, aluminium ammonium sulfate, and fumaric acid, a slow-acting group such as ammonium bicarbonate, sodium bicarbonate, $glucono-{\delta}-lactone$, and ammonium chloride. and a double-acting group such as anhydro monocalcium phosphate, disodium dihydrogenpyrophosphate, and aluminium potassium sulfate according to the different production rate of gases. The leavening rate of ammonium bicarbonate, which was the highest of all leavening agents used in this experiment, was 131.25%. But its after-taste in a cookie was not good due to the residual ammonia. $Glucono-{\delta}-lactone$ only had no after-taste. The higher leavening rate, the more peaks in texture profile graph. Ammonium bicarbonate showed the most peaks in this experiment. It was found that the number of peak had correlation with brittleness of cookies $(r^2=0.8176)$ and brittleness of cookies was different as to various chemical leavening agents.

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