• Title/Summary/Keyword: operation performance

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COMPUTER SIMULATION OF TRACTOR PERFORMANCE WITH REGARD TO ENERGY SAVING AND POLLUTION REDUCING

  • Zou, Cheng;Sakai, Jun;Nagata, Masateru
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 1993.10a
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    • pp.1110-1116
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    • 1993
  • A study on optimum operation performances of power efficiency, economy and exhaust emissions for a tractor was conducted. A mathematical model of multiple degree polynomial equation was applied to established the function of solid multiple parameter curves for specific fuel consumption (ge), cabon monoxide (CO) ,hydrcarbons (HC) and cabonaceous smoke (Rb). The optimum operation theorems for economy operation indicated by ge and for exhaust emissions described by Co , HC and Rb were obtained from analytical method and performance test data. The optimum operation theorems could exhibit optimum operation working points, curves, and regions. The optimum matching relations of engine speed and transmission parameters were analyzed by using computer simulation methods in accordance with the tractor specifications , actual farm working conditions in a typical drawbar pull work such as plowing , the optimum operation objective function, the ideal transmission ratio, practical gear shif ing positions and practical travel speed of the tractor TN55 medel. The results of the anlayzes indicated clearly that the optimum power efficient operation, energy saving and pollution reducing would be realized if the tractor would be operated according to theoptimum operation methods.

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A Study on the Effect of Food Service Franchise's Support System on Franchisee's Trust, Financial Performance and Intention of Multi-Store Operation (외식 프랜차이즈 가맹본부의 지원시스템이 가맹점 신뢰와 재무적 성과 그리고 다점포 운영의도에 미치는 영향에 관한 연구)

  • Kim, ChangBong;Park, WonSun
    • Asia-Pacific Journal of Business Venturing and Entrepreneurship
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    • v.13 no.5
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    • pp.87-102
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    • 2018
  • The purpose of this study is to determine the impact of food service franchise's support system on franchisee's trust, financial performance and intention of multi-store operation. For this purpose, the results of the survey were collected for 111 small and mid-sized food service franchisees in Korea with less than 100 brand franchises, referring to article 9 of the act on Fair Trade. Structural equation model analysis was used for hypothesis testing. The results of the study are as follows; First, a support for store development, education, logistics, and supervisors among franchise's support system were found to have a significant impact on the franchisee's trust, but public relations support was not significantly affected. Second, a support for store development had significant influence on the financial performance, but the support for education, logistics, supervisors and public relations did not significantly affect the financial performance. Third, franchisee's trust has been shown to have a significant impact on financial performance and intention of multi-store operation. Fourth, financial performance was shown to have a significant impact on the intention of multi-store operation. Finally, confirming the mediated effects of financial performance on the effect of franchisee's trust and intention of multi-store operations also proved to have indirect effects. This study identified the impact relationship between the small and medium-sized food service franchise support system, franchisee's trust, financial performance and intention of multi-store operation. In particular, it is deemed meaningful that the performance of Korea's small and medium-sized food service franchises and the relationship of influence that can grow together through the qualitative growth of the franchise's system.

A Performance Comparison between Operation Strategies for Idle Vehicles in Automated Guided Vehicle System

  • Kim, Kap-Hwan;Kim, Jae-Yeon
    • Journal of the Korean Operations Research and Management Science Society
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    • v.23 no.2
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    • pp.67-81
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    • 1998
  • An Automated Guided Vehicle System (AGVS) with a unidirectional loop guide path is modeled as a discrete-time stationary Markov chain. It is discussed how to estimate the mean response time, the utilization, and the cycle time of AGV for a delivery order. Three common operation strategies for idle vehicles - central zone positioning rule, circulatory loop positioning rule and point of release positioning rule - are analyzed. These different operation strategies are compared with each other based on the performance measures.

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Operation Fund Financing and Management Performance of National and Public Medical Institutions and Private Medical Institutions (국·공립의료기관과 민간의료기관의 운영자금 조달과 경영성과)

  • Ha, Au-Hyun
    • Journal of Convergence for Information Technology
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    • v.11 no.4
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    • pp.203-210
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    • 2021
  • This study analyzed the financing ratio by operation fund financing method and their impact on management performance according to the establishment operation management entity of the medical institution. For the analysis method, ANOVA, logistic regression, and regression analysis were conducted using financial information registered with HASPA.The results of the study, The ratio of gross revenue to operating funds differed significantly depending on the establishment operation management entity. In addition, it was found that the financing ratio of each operation fund financing method was significantly related to the management results(deficit, surplus), and the impact of the operation fund financing method on management performance differed according to the establishment operation management entity. As a result, the management of operating funds of medical institutions is deemed appropriate to apply cost management first considering the ratio of revenue to operating funds, and then to utilize internal operating funds.

The Transmission Performance Analysis and Security Policy in Tactical Communication Environment (전술통신 환경에서 전송 성능 분석 및 보안 정책)

  • Hong, Jinkeun
    • Journal of Digital Convergence
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    • v.11 no.12
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    • pp.303-309
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    • 2013
  • This paper analyzed about operation environment and policy for US military tactical communication, and security policy and transmission performance of tactical link. It is presented operation communication message and framework, which is supported semi automated force, SINCGARS specification of link layer in operation environment, and analyzed COMSEC policy and application layer security in tactical security policy. Also it analyzed in respect to transmission performance and crypto synchronization detection. Security policy of tactical link and COMSEC is analyzed in respect of crypto device such as AFKDMS, AKMS, RBECS, KIV-7/HSB.

HARDWARE IN THE LOOP SIMULATION OF HYBRID VEHICLE FOR OPTIMAL ENGINE OPERATION BY CVT RATIO CONTROL

  • Yeo, H.;Song, C.H.;Kim, C.S.;Kim, H.S.
    • International Journal of Automotive Technology
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    • v.5 no.3
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    • pp.201-208
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    • 2004
  • Response characteristics of the CVT system for a parallel hybrid electric vehicle (HEV) are investigated. From the experiment, CVT ratio control algorithm for the optimal engine operation is obtained. To investigate the effect of the CVT system dynamic characteristics on the HEV performance, a hardware in the loop simulation (HILS) is performed. In the HILS, hardwares of the CVT belt-pulley and hydraulic control valves are used. It is found that the engine performance by the open loop CVT ratio control shows some deviation from the OOL in spite of the RCVs open loop control ability. To improve the engine performance, a closed loop control of the CVT ratio is proposed with variable control gains depending on the shift direction and the CVT speed ratio range by considering the nonlinear characteristics of the RCV and CVT belt-pulley dynamics. The HILS results show that the engine performance is improved by the closed loop control showing the operation trajectory close to the OOL.

A Train Performance Simulation using Simulink for Generating Energy-efficient Speed Profiles (에너지 효율적인 속도 프로파일 생성을 위한 Simulink 기반 열차 성능 시뮬레이션)

  • Kang, Moon-Ho;Han, Moon-Seob
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.10
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    • pp.1816-1822
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    • 2010
  • In this research TPS (Train Performance Simulation) blocks are designed using Simulink and applied to generate speed profiles for energy-efficient train operation. With a train operation mode of maximum powering, coasting, and maximum breaking, a breaking point is calculated from forward-backward running profiles. Then, GA (Genetic Algorithm) is used to solve a running time constraint, and a coasting point is produced from the searching process of GA. With the breaking point and the coasting point a speed profile is plotted. Train performance under a speed limit and gradient variations is simulated and resultant speed profiles are analyzed.

SATELLITE OPERATION DESIGN FOR ASSESSING MTF PERFORMANCE OF EARTH OBSERVATION SATELLITE USING STELLAR SOURCES (별을 이용한 지구 관측 위성의 MTF 성능 분석을 위한 위성 운영 설계)

  • Kim, Hee-Seob;Chung, Dae-Won;Choi, Hae-Jin
    • Journal of Astronomy and Space Sciences
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    • v.24 no.4
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    • pp.379-388
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    • 2007
  • Modulation Transfer Function (MTF) of satellite image is an important performance index in satellite image applications. Therefore MTF performance is assessed using satellite image for the ground target during LEOP phase after launch. But the MTF performance assessment using the ground target can be affected by imaging conditions such as cloud and weather. In this paper system requirements and satellite operation for assessing MTF performance of satellite image using stellar sources are proposed. Satellite capability in collecting stellar sources using the satellite which is designed for earth observation and satellite image usefulness for assessing MTF performances were analyzed. The proposed approach will be useful to assess MTF performance of earth observation satellite in lower earth orbit.

Operational System and Performance Management of extra-curricular Programs to Support the curriculum (교과지원 비교과 프로그램의 운영체계 및 성과관리)

  • Kim, Eun-Joo;Kim, Kyung-Seop
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.4
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    • pp.95-101
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    • 2020
  • This study aims to investigate the current status of the operation system of the curriculum support extra-curricular program, focusing on the extra-curricular program operation system of other universities, and suggest the desirable operation system and performance management plan of the extra-curricular program in cultural education. To this end, the analysis of the extra-curricular program operation system of eight four-year universities in the Seoul metropolitan area was conducted on the existence of core competencies, computer systems and extra curricula program guides, credit-linked and mileage scholarship programs, and the analysis focused on the characteristics, merits and demerits of each university's operating system. It was also intended to propose the desirable operation system and performance management plan of the extra curricula program in liberal arts education, focusing on the operation system of the extra curricula program of E University and the corresponding performance management. Conclusion To operate the extra curricula program efficiently, the computer system and the extra curricula program guide, credit link and mileage scholarship system should be introduced. In addition, the analysis of the operation system of the curriculum support program of E University shows that E University operates systematically with the direction of operation of the core competency-based curriculum support extra-curricular program, and the performance management of the extra curricula program of E University is carried out through the EU-TQM System Integrated Management System.

Importance-Performance Analysis for Improving Demand Response Transport(DRT) System (수요응답형교통(DRT)의 활성화를 위한 중요도-실행도 분석)

  • Jang, Tae Youn;Kim, Jun Sung
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.17 no.3
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    • pp.46-58
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    • 2018
  • DRT should have higher positive benefits to become the public transit than the current backcountry buses having demand deficiency and operation problems. The study examines the factors for activating DRT through importance and performance analysis(IPA) and applies the IPA gap theory to find relationship between the current buses and DRT in the mixed operation area. As a result, the operation area is the urgent improving factor and the next ones are transfer related factors, on-time arrival, safe driving, operation time and vehicles. According to the gap theory to activate DRT and reduce the current bus system, in the case that performance is smaller than importance, the performance of transfer, operating time and area, and vehicles should be up. In the case that performance is higher than importance, the performance of luggage space, vehicle clean, safe driving, operator kindness, transfer, operating elements, and fare should keep going.