• 제목/요약/키워드: Standard facility

검색결과 917건 처리시간 0.026초

22.9kV 수용가 전력계통별 고조파 발생실태 및 관리기준 조사분석 (to examine of management standard by the harmonics measured and analyzed in 22.9kV Power lines)

  • 이은춘;신강욱;홍성택;홍영재;박영춘;임재일
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2004년도 하계학술대회 논문집 A
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    • pp.270-272
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    • 2004
  • At the water supply field, high voltage induction motor is main facility of a load equipment. The motor is often out of order and its noise, generated heat, loss etc occurred occasionally. especially, transmission motor for flux control generates an amount of the harmonics then have a bad influence upon the electric power system. In this study, to analyze the total harmonics distortion of the water supply field receiving high voltage, the harmonics measured and analyzed using the PQA(Power quality Analyzer) according to the electric power system and electrical load and the reduction method presented.

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포장용기 표준화를 통한 기업 내(內) 물류효과 분석 (Analysis of Logistics Effects in Enterprises by the Medium of Standardization of Packing Containers)

  • 원유존;김진호;김동규
    • 대한안전경영과학회지
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    • 제14권4호
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    • pp.193-203
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    • 2012
  • In the limitless competition era of the 21st century, cost reduction is being highlighted as one of survival strategies of businesses. The first item for cost reduction of businesses is logistical costs. The most keenly required thing for this is to remove unnecessary elements, and the best way to realize it to cut down processes using automatic facilities. Packing container in logistics is like a facility. This study is intended to analyze reduction of costs, improvement of business process and reduction of working force through standardization of standardization, and logistics effects through improvement of environmental images in enterprises.

PLS-II 용 반도체 스위치 기반 키커 펄스 모듈레이터 설계 및 제작 (Design and Implementation of Solid-State Kicker Modulator for PLS-II)

  • 안석호;공형섭;박웅화;이병준
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2019년도 전력전자학술대회
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    • pp.307-308
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    • 2019
  • The Pohang Light Source (PLS) - II is a 3 GeV third-generation synchrotron radiation facility. To inject electron beam from LINAC, a kicker modulator system and kicker magnets are installed in the PLS-II storage ring tunnel. The injected beam then falls into the storage ring beam dynamic aperture. This paper describes the design and implementation of the solid-state kicker modulator for PLS-II. The solid-state kicker modulator is consisted of high voltage solid state switch stacks. the technical considerations of the solid-state switch stacking for kicker modulator is discussed. The achieved capability of the solid-state kicker modulator demonstrates that is fulfills the design requirement of providing half-sine pulsed current of 10kA (peak), 6us (Base-width), with jitter < 2ns (Standard deviation). simulation and experimental results are presented to demonstrate the performance of the solid-state kicker modulator.

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송신 안테나에 의한 5 GHz 이차 잔류 디퓨저를 적용한 전자파 잔향실의 내부 필드 균일도 변화 (Electric Field Uniformity in Reverberation Chamber with 5 GHz Diffuser by Transmission Antenna)

  • 이유진
    • 반도체디스플레이기술학회지
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    • 제20권3호
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    • pp.83-86
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    • 2021
  • In this paper, electric fields in electromagnetic reverberation chambers, which are used as a substitute facility for EM-free anechoic chambers, are analyzed. This paper focused on the 4-5 GHz band, which is expected to adversely affect equipment. To analyze the field uniformity inside the electromagnetic reverberation chamber, electric field strengths are sampled and finite-difference time-domain method was used for numerical analysis. Moreover, Quadratic residue diffuser was used to improve the characteristics of the electromagnetic reverberation chamber and the uniformity of the internal field strength. Standard deviation, tolerance characteristics, and partiality characteristics were compared while varying the aiming point of transmission antenna.

측정점 교환방식 미세입자 모니터링 시스템 고도화 (Advancement of Sequential Particle Monitoring System)

  • 안성준
    • 반도체디스플레이기술학회지
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    • 제21권1호
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    • pp.17-21
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    • 2022
  • In the case of the manufacturing industry that produces high-tech components such as semiconductors and large flat panel displays, the manufacturing space is made into a cleanroom to increase product yield and reliability, and various environmental factors have been managed to maintain the environment. Among them, airborne particle is a representative management item enough to be the standard for actual cleanroom grade, and a sequential particle monitoring system is usually used as one parts of the FMS (Fab or Facility monitoring system). However, this method has a problem in that the measurement efficiency decreases as the length of the sampling tube increases. In this study, in order to solve this problem, a multiple regression model was created. This model can correct the measurement error due to the decrease in efficiency by sampling tube length.

Learning Laparoscopic Liver Resection for Liver Cancer

  • Tan To Cheung
    • Journal of Digestive Cancer Research
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    • 제5권1호
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    • pp.28-31
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    • 2017
  • The number of laparosocpic liver resection performed every years has been increasing. There is a trend than more major hepatectomy and complex liver resection is being reported. However there has been a major obstacles in many centers because open liver resection is still considered as a gold standard and many surgeons are still getting used to the old method of liver resection. To start a new procedure, education and training is essential in order to achieve a good outcome without compromising the safety of the patients. A gradual progression is crucial in order to avoid dreadful complication. The development of the consensus meeting and difficulty score has facility the understanding of safe practice in the development of laparoscopic liver resection. In a long run, development of registry system will improve transparency and safety of this operation.

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치과위생사의 방사선 촬영업무의 확대에 대한 문헌적 고찰 (A literature review on expansion of dental hygienists' radiography operations)

  • 최영숙;김진경;장종화;박용덕
    • 한국치위생학회지
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    • 제9권2호
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    • pp.111-124
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    • 2009
  • This study analyzes through the review of literature and laws the exposure time, clinical frequency, and radiation exposure of intraoral and extraoral radiography as well as of panoramic radiography performed by dental hygienists in dental clinics, compares the dental radiology curriculums of radiological science and dental hygiene departments, and proposes the expansion of dental hygienists' radiography operations. The radiology curriculums were compared between the radiological science and dental hygiene departments of colleges. For new analysis by radiography for dental diagnosis, the exposure time, radiation absorbed dose, effective dose, and number of days of natural radiation were compared by the type of oral radiation films and radiographical techniques proposed by domestic and international studies. The exposure time of panoramic radiography is 15 seconds and it takes about two minutes for completion, whereas the exposure time of the standard radiography is 0.2~0.8 seconds and it takes 10 times longer for completion of the radiography of full mouth than the panoramic radiography. The standard radiography can cause distortions of radiation at severely curved parts of dental arch and palatopharyngeal reflex. However, panoramic radiography can be performed even for lock jaw patients, causes less inconvenience to patients and is much simpler than the standard radiography. The percentage of dental clinics where radiography is performed by dental hygienists was 92.0%, and the percentage of standard film radiography by dental hygienists was 98% whereas the percentage of panoramic radiography by dental hygienists was 92%. For the absorbed dose which is an indicator of radiation exposure, the When the effective dose which is an indicator of the danger of radiation exposure was converted to the number of days of natural radiation, it was 3.3 days for panoramic radiography, but 13.9 days for the full mouth standard radiography by bisecting angle technique which was 4.2 times longer than the panoramic radiography. There were two colleges that had a dental radiology course with two credits in the departments of radiological science. The credits for dental radiology courses in the department of dental hygiene ranged varied by college, ranging from 3 to 8; on average, the theory course was 2.2 credits and the practice course was 2.02 credits. To summarize the above results, the percentage of dental clinics where panoramic radiography is performed by dental hygienists under the guidance of dentists is high. Panoramic radiography has become an essential facility for dental clinics. It is faster than standard film radiography and less dangerous due to low radiation exposure. Panoramic radiography is a simple mechanical job that does not require training of oral radiography by radiotechnologist. Because panoramic radiography is one of major operations which must be performed at all times in dental clinics, it must be designated as intraoral technique rather than extraoral technique, or legalized for inclusion in the scope of operations of dental hygienists.

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상주 및 인근지역 단체급식소의 다량조리 실태 연구 -식단분석 및 다량조리 실태- (A Study on the Quantity Food Production Practices of Foodservice in Sangju and Near-by Region)

  • 박모라;김귀영;박필숙;강우원
    • 동아시아식생활학회지
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    • 제8권1호
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    • pp.36-50
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    • 1998
  • The purpose of this study was to investigate quantity food production practices in foodservices by analysing the menus of April, 1996, The questionnaire was developed and responded to by 96 dietitians in Sangju, Munkyung, Gumee, Kimchun, and Andong during November, 1996. The survey was performed by simple random samplings. The results were as follosw; 1. Hospitals and industry served food for thirty days and schools for twenty days. Kimchi was a select-menu for hospitals and one side dish for industry and schools. The type of menu was a single use menu which consisted of cooked rice, soups and three side dishes. 2. The most frequently used ingredients were green onions, rice, carrots, onions, Korean radish roots, pork, eggs, glutinous rice, and milk. Kimchis were served most frequently in all food services and cooked rices and soups were next. 3. The age of most of the respondents was 26 to 30.54.2% of subjects were juniou college graduates and 77.1% were single. Fifty seven point three percent of the dietitians lived with family relatives, or friends. 87.5% of the dietitians had been working for 1 to 5 years. 4. Most foodservices were self-operated. The number of meals served was determined by meal coupon counting in hospitals(37.5%), meal board counting in industry(29.2%), and attendance card counting in schools(41.1%) The cost of sales per meal was approximately 2,450 won in hospitals and was approximately 1,100 won in industry and schools. The average number of days per menucycle was 7.4 in hospitals. 10.3 in industry and 25.5 in schools. Hospitals, industry, and schools held about 118, 265 and 263 recipes respectively. The average number of dietitians was 2.6 in hospitals and 1.0 in industry and schools. Except for the number of recipes, the general practices of foodservices were significantly different(P<0.05). 5. In the general quantity food production, food and seasonings measuring was hardly done. the percentage of foodservices using chemical seasonings was higher in hospitals and industry than in schools. the most important concern was taste, Registered cooks were employed in 75% of schools but only 50.0% in hospitals and 20.8% in industry. Most of the dietitians respinded that their cooks skill was not bad. The education of unregistered cooks was performen once or two times a month in hospitals and industry, and in schools performed everyday. The problem when educating cooks was the lack of cooking skill of the dietitians in schools, and the lack of time in hospitals, and the negative attitude toward education in industry. The method for improving cooking in all foodservices was OJT, or the extension of education facilities and the development and dissemination of standard recipes. The frequency of throwing away leftovers was higher in hospitals. But in industry, the frequency of saving leftovers was higher. 6. Though all foodservices have standard recipes, the number that used them was low, Another problem is that standard recipes resulted in leftovers. The inconveniences of using standard recipes were the difficulty of applying standard recipes to various numbers of customers the complication of use, or facility insufficiency.

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아동보육시설의 실외놀이 환경 디자인지침 개발 연구 (A Study on the Development of Design Guidelines for the Outdoor Play Settings in Child Care Center)

  • 최목화;변혜령
    • 한국생활과학회지
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    • 제16권4호
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    • pp.855-875
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    • 2007
  • The purpose of this study is to suggest a guideline for outdoor play settings in child care centers. From March to July, 2005, data were collected from 223 directors at child care centers through a structured questionnaire, field measurement survey and non-participatory observation in seventeen child care centers in Seoul and Daejeon. The statistical methods for analysing data were frequency, percentage, mean, $X^2$ and F-test. The results showed as follows: 1)the existing outdoor playground area in child care centers should be expanded more than $4\;m^2$ per child. 2) Outdoor play facilities should be equipped with two structured play sets, a play facility for unstructured play and an adventure facility to make child's various activities possible and to promote child development. 3)flooring materials for outdoor playground should be required to use more than three kinds such as solid coverings (cf. asphalt, standard concrete), wood, lawn, soil or sands. 4)to let children enjoy various activities, outdoor playground area should be composed of various play facilities like indoor play gyms and should be independent but have good connections between play facilities depending on characteristics of play activities. 5)Play spaces of outdoor playground should be composed of physical play space, unstructured and dramatized play space, rest space, space for nature and adventure space. In addition, appropriate play equipments should be provided in respective play space.

물류센터의 물류활동과 인프라를 고려한 한국산업규격(KS)의 개선방향에 대한 연구 (A Study on the Improvement of the Korean Industrial Standards Related to Logistics Centers : Based on Logistics Activities and Infrastructures)

  • 손병석
    • 한국항만경제학회지
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    • 제27권1호
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    • pp.31-54
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    • 2011
  • 본 연구는 국내 물류센터에서 다양한 물류활동이 수행되기 위해 필요한 인프라 요인들을 기반시설, 물류설비, 물류장비, 운영시스템으로 분류하고 정의하였다. 물류활동에 직 간접적으로 영향을 주고 있는 물류센터의 인프라 요인을 체계적으로 분석하여 제시함으로써, 물류센터 내의 물류활동에 대하여 명확하게 파악하고 인식할 수 있는 토대를 제공한 것이다. 또한 물류센터와 관련된 한국산업규격(KS)의 인지도와 사용률이 매우 낮은 문제점을 개선하기 위해, 국토해양부 교통체계효율화사업(보관시설 표준정합시스템 개발연구)의 일환으로 수행된 국내 321개 보관시설 조사와 분야별 전문가 자문회의 결과를 이용해 한국산업규격(KS) 개선방향을 제시하였다. 본 연구는 물류활동과 인프라 요인(기반시설, 물류설비, 물류장비, 운영시스템)을 고려한 한국산업규격(KS) 개선방향을 제시함으로써 국내 물류센터의 설계 및 운영의 효율성을 도모할 수 있는 기틀을 제공할 수 있을 것이다.