• 한국식품조리과학회지
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• 제20권3호
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• pp.247-255
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• 2004

The foodservice industry is changing more and more from on-site foodservice management to contract foodservice management. However there are differences according to the level of management and operation of contract foodservice management company (CFMC). The necessity of certification on CFMC is increasing to enable fair discrimination of CFMC among most clients that want to contract with CFMC. This study was performed to identify the foodservice operation evaluation model's criteria items for certifying CFMC. The analysis research methods included literature review, content analysis, individual interview, Delphi technique, and brain storming. First, the following infrastructure items were prepared in the contractor's viewpoint: procurement, transparency of operation, menu development and operation system, nutrition service system, professional employee education, sanitation andsafety management system, customer satisfaction system, facility system, management information system (MIS), business and economics. Second, the evaluation criteria required by the contractor on the client's view point was similar to school foodservice, hospitalfoodservice, and business andindustry foodservice except extraordinary items of field. Third, evaluation criteria and detail categories and items were identified such as financial focus, customer focus, process focus, human focus, and renewal and development by grafting on intellectual capital evaluation methodology for CFMC.

• Asian-Australasian Journal of Animal Sciences
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• 제14권9호
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• pp.1326-1330
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• 2001

This study analyzed the lowest production cost and the greatest profit to be obtained from marketing hogs to determine the optimal operation scale for family-owned farrow-to-finish farms. Data were collected from 39 farrow-to-finish farms with 500 to 5,000 inventories for two consecutive years, and treated with GLM and quadratic regression models using the REG procedure. Analysis results indicated that farms capable of marketing 2,933 and 3,286 hogs annually had the lowest production cost and the greatest profit, respectively. Further analysis attributed the lowest production cost or the highest return in farms with an optimal scale of 3,000 to a higher survival rate of the herd, as well as lower expenses in veterinary medicine, labor, utilities and fuel, transportation, and depreciation. A similar feed conversion efficiency was observed for all the farms studied. Obviously, the cost efficiencies were associated with the economy of the operation scale of hog production until it reached 3,000 hogs marketed annually for a family-run unit. Beyond the optimal scale of 3,000 hogs, good stockmanship was more difficult to maintain and the herd management deteriorated as increasing mortality confirms. It is conclude that, unless advanced management is applied, the operation scale should not expand beyond 3,000 hogs.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 춘계학술대회
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• pp.783-785
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• 2013

본 논문은 무인항공기의 운용 고도 및 거리를 데이터링크 측면에서 분석하였다. 무인항공기의 운용 고도는 일반적으로 탑재되는 임무장비의 특성 및 운용 목적에 따라 결정된다. 무인항공기의 운용고도를 결정하기 전에 데이터링크 장비의 가시선 조건을 반드시 고려해야 한다. 가시선 분석은 지상통신장비의 안테나 특성 및 설치고도, 지구의 곡률 반경을 사용하여 분석했다. 지상통신장비 설치고도가 0m 일 때, 32dBi 파라볼라 안테나를 사용할 경우 통신거리 300km에서 13,724m이고, 44dBi 파라볼라 안테나를 사용할 경우 6,657m에서 운용 가능하다. 또한 원거리 통신에서는 고 이득안테나가 운용 고도 측면에서 유리함을 확인하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
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• pp.157-158
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• 2005

Superconducting fault currents(SFCLs) are expected to improve not only reliability but also stability of real power systems. The analysis on the single line-to-ground fault of the integrated three phase flux-lock type SFCL, which consists of three flux-lock reactor wound on an iron core in each single phase and three YBCO thin films, was investigated in current limiting operation characteristics. We compared 21turn numbers with 42turn numbers according to wound turn numbers each the coil 2 under the additive polarity winding operation between coil 1 and coil 2. The three phase flux-lock type SFCL using an iron core differently operates general three phase resistive SFCLs. When a single line-to-ground fault occurred, the SFCL's three units were quenched after fault onset. We confirmed effective current limiting operation characteristics with adjustable inductance level.

• 한국국방경영분석학회지
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• 제33권2호
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• pp.1-15
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• 2007

현재 항공작전은 작전에 영향을 미치는 각종 장애요인들을 고려하지 않고 있다. 보다 효율적인 항공전력운용을 위해서 이들 장애요인들을 예상하고 대비한다면 좀 더 실질적인 항공작전 계획수립에 도움이 될 것이다. 본 연구는 이들 장애요인들이 항공전력 산출에 미치는 영향을 파악하여 항공작전 임무수행 능력, 가용전력 파악을 통해 효과적인 진력 운용에 대해 분석하였다. 이를 위하여 시뮬레이션 분석 도구인 AREA 10.0을 사용하였다. 본 연구에서는 항공전력 산출의 장애요인을 기상, 화생방 상황, 항공기 고장, 적 교전 손실의 4가지로 한정하여 분석하였다. 또한 민감도 분석을 통해 전천후 부장 사용 및 화생방 상황 증가에 따른 전력 산출의 변화를 분석하여 전시 항공작전 장애요인이 전력산출에 끼치는 영향에 대해서 연구하였다.

• 산업경영시스템학회지
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• 제10권16호
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• pp.183-195
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• 1987

The effectiveness of quality control is contingent to adaptability to the present circumstance. The objectives of this study are to provide empirical data to carry out qualify control effectively. To accomplish this purpose, an empirical study was made by questionaire (mailing survey method, Feb. to Mar. in 1987). The sample is the 167 companies in Korean manufacturing industry. The main findings out of the analysis are as follows the stage of quality control is concentrated in appraisal phase, the company standard is equiped gradually in non-KS marked company and the need of economic evaluation about quality control is increased gradually. With a view to analysing of relationship between quality control and it's effect factors (company standard, KS mark, computer based information system), the methods of $\chi$$^2$ test are used. The company standard have a significant difference in top manager's altitude to duality control, operation stage of quality control. operation scope of qualify control and quality budgeting system but is insignificant with economic evaluation about duality control. Otherwise, KS mark is insignificant with the equality control activity except for operation scope. The quality information system based in computer have a significant difference in operation stage, operation scope and economic evaluation. Therefor, for the purpose of attaining effectiveness of quality control through the economic evaluation about quality control, the company standard and computer based duality information system must be utilized in quality control activity.

• 한국기계가공학회지
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• 제18권6호
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• pp.82-90
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• 2019

To reduce emissions of marine pollutants, regulations are being tightened around the world. In the shipbuilding and shipping industries, various countermeasures are being put forward. As there are limits to applying countermeasures to ships already in operation, however, it is necessary for these vessels to use energy efficiently. The sensors installed on ships typically gather a very large amount of data, and thus a big data platform is needed to manage and analyze the data. In this paper, we build a big data analysis platform based on Hadoop and Spark, and we present a method to detect abnormal ship operation using the platform. We also utilize real ship operation data to discuss the data analysis experiment.

• Nuclear Engineering and Technology
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• 제54권10호
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• pp.3878-3887
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• 2022

For the future energy-mix policy for carbon neutrality, demand for the capability of load-follow operation has emerged in nuclear power plants in order to accommodate the intermittency of renewable energy. The short-term decay heat analysis is also required to evaluate the decay heat level varied by the power level change during the load-follow operation, which is a very important parameter in terms of short-term decay heat removal during a grace time. In this study, the short-term decay heat level for 10 days after the shutdown was evaluated for both seasonal and daily load-follow cases. Additionally, the nuclide-wise contribution to the accumulated decay heat for 10 days was analyzed for further understanding of the short-term decay heat behavior. The result showed that in the seasonal case, the decay heat level was mainly determined by the power level right before the shutdown and the amount of each nuclide was varied with the power variation due to the long variation interval of 90 days. Whereas, in the daily case, the decay heat level was strongly impacted by the average power level during operation and meaningful mass variations for those nuclides were not observed due to the short variation interval of 0.5 days.

• 한국전자통신학회논문지
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• 제18권1호
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• pp.143-148
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• 2023

현재 도선과 예선은 선박의 접·이안과 입출항을 지원함으로써 선박, 항만, 인명에 대한 사고 발생을 방지하여 재산상 피해를 최소화하거나 제거하는 기능을 수행한다. 도·예선 시스템은 항만의 기능이 원활하게 이루어지게 하는 필수적인 기능으로 항만의 물동량에 가장 큰 영향을 미치는 시스템이다. 본 연구에서는 도·예선의 운영정보를 활용하여 항만의 운영 효율화, 선박 대기시간 단축, 선박 운영의 최적화, 최적의 도·예선 배정이 가능한 도·예선 정보체계 분석 운영시스템을 개발하였다.

• 한국산업융합학회 논문집
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• 제26권6_2호
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• pp.1109-1115
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• 2023

The shell and tube-type heat exchanger was the most utilized in industrial field because of its simple structure and wide operation conditions and so on. This study was performed to investigate the characteristics of behavior of thermal flow according to operation condition of small-sized shell and tube-type heat exchanger. The operation conditions, here, were set up to flow rate of hot air with temperature of 100℃, number of baffle and cut rate of baffle(BCR) using numerical analysis. As the results, both mean relative pressure and relative pressure drop was increased with quadratic curve in case of less than BCR 25%, however, decreased linearly in case of more than BCR 25%. The collision with first baffle by flow velocity and temperature, of hot air, respectively, was depended on BCR. Further it showed that the behaviors between flow velocity and temperature were almost similar.