• 제목/요약/키워드: Performance Quantity

검색결과 993건 처리시간 0.027초

생물학적 하수처리에 소요되는 적정 폭기량의 판단 시스템 설계 (Designing a decision making system of inferring reasonable $O_2$Quantity needed to process wastewater via biological reaction)

  • 이진락;양일화;이해영
    • 조명전기설비학회논문지
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    • 제15권6호
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    • pp.89-96
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    • 2001
  • 본 논문에서는 생물학적 반응을 이용한 하수처리에서 미생물의 유기물 분해 반응에 필요한 적정 폭기량을 판단하는 기법을 제안한다. 적정 폭기량의 판단 시스템은 크게 세가지 부분으로 구성된다. 첫 번째는 주어진 운전데이터로부터 적정 폭기량을 판단하는 기능이며, 두 번째는 투입 폭기량을 판단된 적정 폭기량으로 변경했을 때의 처리 성능을 하수 처리 과정의 모델을 이용하여 계산하는 부분이고, 세 번째는 판단 결과를 보여주는 부분이다. 40일 동안의 하수처리장 운전데이터를 이용하여 제안된 판단 시스템의 성능을 확인하여 본 결과, 하수처리의 목적을 달성하면서도 폭기량을 10%이상 절감할 수 있음을 보였다

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집.배수용 투수성 폴리머 콘크리트 관의 농업 수리시설물의 현장적용 (Field Application of Permeable Polymer Concrete Pipe for Drainage)

  • 민정기;연규석;성찬용
    • 한국농공학회지
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    • 제45권6호
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    • pp.136-143
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    • 2003
  • This study is performed to evaluate performance of the developed pipe when using for underground drainage in fm land, the efficiency of the pipe is examined such as quantity of drainage, water temperature and other field performance in all weather condition. Results of this study, the higher permeability through wall of the pipe is achieved by making various size pores using open-graded aggregate. And in all weather conditions, permeable polymer concrete pipe perform much better than conventional perforated pipes. During rice farming period, quantity of drainage the permeable polymer concrete pipe is 1.25 time greater than conventional perforated pipes. Therefore, use of the permeable polymer concrete pipe is greater advantages when considering collecting and draining capacity compared with conventional perforated pipes.

EVALUATING THE FEASIBILITY OF THE HIGHWAY ENGINEERING SCHEDULE USING SIMULATION TECHNIQUE

  • Liu Weijun;Yuan Jianbo;Zhang Jianren
    • 국제학술발표논문집
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    • The 1th International Conference on Construction Engineering and Project Management
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    • pp.897-901
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    • 2005
  • In the highway engineering, the performance, quantity and status of machines available for the project have direct impact on the project time. For instance, the status of machines, such as working or in trouble, have great influence on the activity execution. Therefore, while scheduling the project, the project manager always increases the spare machines or prolong the activity time to avoid delaying the project time when some of the machines are in trouble in construction site. However, how many are the spare machines and how long are the prolonged activity time, which are estimated subjectively by the manager. This subjective estimation has been criticized for systematically overestimating or underestimating quantity of the machines and the activity time. In the paper, we propose and prototype a model to simulate the status of the machines in construction site, and then to evaluate the schedule feasibility considering the performance, quantity and statues of the machines involved.

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An interaction between cognitive ability and personality on the performance of computer-based group idea generation

  • 정종호
    • 한국정보시스템학회지:정보시스템연구
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    • 제29권2호
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    • pp.265-286
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    • 2020
  • Purpose Among various psychosocial factors, negative social comparison, attention blocking to stimuli, and cognitive interference via information overload are considered most critical in hindering the effective performance improvement of computer-based idea generation. Given that the effect of negative social comparison along with a plausible solution based on the notion of performance feedback and goal setting has been successfully addressed, this study focused on the remaining issues of "attention blocking to stimuli and cognitive interference via information overload" and attempted to find a way to alleviate the effect of such process losses on performance. Design/methodology/approach A 2 × 4 between-subjects design was used, crossing cognitive ability (high and low) and personality (extroversion and introversion). Five subjects per each treatment were randomly selected to make the sample size equal. The group simulator was used to measure individual-level performance. The dependent variables were the quantity of and quality score of ideas. The manner by which these performance measures were operationalized was consistent with prior studies. An additional analysis using the number of diverse ideas was also conducted. Findings Three arguments were made in this study: (1) high cognitive individuals would perform better than low cognitive individuals, (2) extraverted individuals would perform better than introverted individuals, and (3) cognitive ability and personality would interact such that individuals in Q1 would have the highest performance. Cognitive ability had an effect on quality not quantity. Personality had an effect on both quantity and quality. An interaction between cognitive ability and personality was not found due to small sample size despite the use of the group simulator.

복합화력의 냉각수 배열회수를 위한 히트펌프의 성능평가 사례 분석 (Analysis of the Performance Test Results of a Heat Pump for Closed Cooling Water Heat Recovery on a Combined Thermal Power Plant)

  • 이성호
    • 설비공학논문집
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    • 제26권11호
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    • pp.541-546
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    • 2014
  • The present study was conducted to determine whether ESCO Business is success or not. ESCO Business recovers the investment costs by the energy savings resulting from complementing existing energy facilities. The guaranteed parameters are Quantity of Heat Recovery, and Generator output drop. The results of the Performance Test show that the Quantity of Heat Recovery increased by 11.52 Gcal/h, and Generator output decreased by 0.234 MW, which satisfied the guarantee value.

Effectiveness of Minimal Quantity Lubrication in Machining Processes

  • Suda, S.;Yokota, H.;Inasaki, I.;Wakabayashi, T.
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 2002년도 proceedings of the second asia international conference on tribology
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    • pp.309-310
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    • 2002
  • A minimal quantity lubrication (MQL) machining is able to achieve both functions of cooling and lubrication with an extremely low quantity of a cutting fluid and a large amount of air blow. Using a biodegradable ester oil, turning tests were carried out to evaluate the effectiveness of the MQL system. It was found that the performance of MQL cutting was equivalent to, or better than, that of conventional cutting, because the MQL system tends to prevent the heat damage of the tool tip and, if an effective lubricant such as a particular polyol ester is applied to the system, it can avoid the extensive transfer of workpiece materials on to the tool surface.

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라디에이터 통과풍량 확보를 위한 수치적 검토 (Numerical Analysis for Improving Passing Flow Rate Quantity abound a Radiator)

  • 김은필;강상훈
    • Journal of Advanced Marine Engineering and Technology
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    • 제25권2호
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    • pp.304-310
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    • 2001
  • This paper describes the analysis of flow field using a projection finite element method. The projection scheme with a pressure correction is presented for the analysis of an incompressible Navier-Stokes flow. The projection scheme is analyzed numerically and applied to the well-known bench marking problems such as lid driven cavity. Finally, the projection scheme is applied to a flow through the automobiles front. In the automobiles cooling system, the flow through its front is very important to a cooling performance. The results show that the flow quantity increases by locating the position of bumper to the further front position of a car. And, the improvement on the suction part below a bumper achieves the more passing flow quantity. The attachment of an air dam increases passing flow quantity causing the pressure rise to the front part and the pressure drop beneath a car.

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다목적댐의 응수공급능력 평가지표 산정에 관한 연구 (A Study on Estimate of Evaluation Indices of Water Supply Capacity for Multipurpose Dam)

  • 차상화;박기범
    • 한국환경과학회지
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    • 제13권3호
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    • pp.197-204
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    • 2004
  • In this study analyzed the reliability indices against the water supply ability of Andong dam. The water supply analysis of Andong dam used the HEC-5 model. So Andong dam simulated planed water-supply capacity of Andong dam as increase and decrease +5% ~ -5% of water supply quantity. Water-supply capacity of Andong dam estimated, deficit occurrence, deficit quantity, deficit period. As the results estimated reliability(occurrence based, time based, quantity based) and resiliency vulnerability and with water supply capacity evaluation indices of Andong dam. Also reliability(occurrence based, time based, quantity based), resiliency, vulnerability and resiliency indices are estimated to evaluated the performance of water supply on Andong dam, and their relationships are evaluated.

Development of a Composite Revenue Sharing-Quantity Flexibility Contract

  • Lumsakul, Pasuree;Luong, Huynh Trung
    • Industrial Engineering and Management Systems
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    • 제12권3호
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    • pp.224-233
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    • 2013
  • In supply chain management, the supply contract can induce collaboration and coordination among the supply chain members in order to optimize supply chain performance. Numerous supply contracts have been examined; however, some difficulties related to the application of these contracts still occur. One of the solutions is to apply the composite supply contract which can assist in the supply chain coordination. This research examines the composite contract of the revenue sharing and quantity flexibility contracts in a two-stage supply chain, which comprises a retailer and a supplier. In this research, a mathematical model of the composite contract is developed; then, the applicability of the proposed composite contract is examined by investigating its capability in terms of supply chain coordination and profit allocation. In the numerical experiments, the composite revenue sharing-quantity flexibility contract showed that it is superior to both component contracts in terms of supply chain coordination and profit allocation among supply chain members.

정수장에서 발생된 탈수슬러지의 량에 의한 배출수처리시설용량에 대한 평가 (Estimation on the Design Capacities of Residuals Treatment Facilities by the Quantity of Dewatered Sludge Generated from Water Treatment Plants)

  • 문용택
    • 상하수도학회지
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    • 제18권6호
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    • pp.715-723
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    • 2004
  • The quantity of residuals generated from water treatment plants depends upon the raw water quality, dosage of chemicals used, performance of the treatment process, method of sludge removal, efficiency of sedimentation, and backwashing frequency. Sludge production by the physical separation of SS occurs under quiescent conditions in the primary clarifier, where suspended solids are allowed to settle and to consolidate on the clarifier bottom. Raw primary sludge results when the settled solids are hydraulically removed from the tank. The relative solid and liquid fractions of a slurry are most commonly described by the solids concentration, expressed as mg/L or percent solids. The purpose of the present investigation is to estimate a suitability on the design capacities of residuals treatment facilities by the quantity of dewatered sludge generated from water treatment plants.