• Title, Summary, Keyword: Turnaround time

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Performance Improvement of Soft Real-Time Scheduler in OSF/1 (OSF/1 기반 SRT 스케쥴러의 성능 향상)

  • Lee, Seung-Ho;Heu, Shin
    • The Transactions of the Korea Information Processing Society
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    • v.4 no.1
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    • pp.246-254
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    • 1997
  • This paper proposes an improved scheduling model and algorithm which threads in the fixed-priority policy have faster response time and turnaround time than existing ones in SRT system. Sub run queue is added into the system and is used for the quick execution and aging of threads in the fixed-priority policy. Using simulation two method are compared. The results shows that the new scheduling model gets threads in the fixed-priority policy to run faster than existing ones.

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Numerical Analysis of Delivery Reservation Effect (컨테이너 반출예약제 기대효과의 계량적분석)

  • 김우선;최용석;하태영
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.237-241
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    • 2003
  • To improve competitive power of the container terminal, we must enhance the yark efficiency of a domestic container terminal in the chronic shortage situation, Therefore, we investigate the basic concept and the expected effect delivery reservation when applying at existing container terminal.

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Performance Trend Analysis For IN System Based On DB Updating Method (DB 수정방식에 따른 지능망 시스템의 성능추이분석)

  • 노용덕
    • Journal of the Korea Society for Simulation
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    • v.11 no.2
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    • pp.45-53
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    • 2002
  • The main idea behind the Intelligent Networks(IN) concept is the separation of switching functionality from the service control, in order to meet various service requirements of subscribers and development of new services in time. In (N+1) type Intelligent Network with FEP-BEP framwork, each SCP-BEP system maintains its own subscibers' database respectively. In this case, DB updating operations at each SCP-BEP should be peformed concurrently such that DB updating method could affect the overall system performance. Moreover, it is not easy to predict the current system capacity to satisfy the future IN subscribers' service needs. In this paper, we discuss how much DB updating method affects the performance trends of (N+1) type Intelligent Network with FEP-BEP system by means of the simulation technique as the number of calls increase. The average turnaround time is used as a system performance measure.

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A pragmatic algorithm for the Minimum Railway Stock Maintenance Routing Problem (최소차량운용문제에 대한 실용적 해법)

  • Hong Seong-Pil;Kim Gyeong-Min;Lee Gyeong-Sik;Park Beom-Hwan;Hong Sun-Heum
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • pp.25-32
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    • 2006
  • Given a schedule of train to be routed by a Railway Stock, Railway Stock Routing Problem determine a sequence of train while satisfying turnaround time and maintenance restrictions. The objective is to minimize the Railway Stock during a week and each day simultaneously. And we prove that Railway Stock Routing Problem with maintenance restrictions is NP-hard. In this paper, we present two stage approaches that solve the Railway Stock Routing Problem in a reasonable time. In first stage we relax maintenance restrictions and formulate as a Min-cost-flow problem. Then, in the second stage, we attempt to satisfy maintenance restrictions using ours heuristic algorithm. We show the computational result of applying to an actual train schedule data.

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A Study on the Displacement Analysis in the Injection Molding for the Plastic Lens (플라스틱 렌즈 사출에서의 변위 해석에 관한 연구)

  • Lee, Joo-Sang;Yoon, Sang-Jin;Kim, Chi-Kyoon
    • Journal of the Korean Society of Mechanical Technology
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    • v.19 no.4
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    • pp.567-572
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    • 2017
  • Smart phones are currently the most popular electronic devices with high volume production activities driven by high demand and requirements for rapid turnaround time. The changes of displacement were analyzed according to a variable of the gate size and runner system. The radial type and gate with large size were shown that better results in displacement. While the design and production of lenses, the key component of a camera, still need to be improved, the current technology has run into its limit with regard to trends in size and weight reduction. In this study, an injection molding analysis was performed on plastic lenses that are widely employed for smart phone cameras. Specifically, the displacement of lenses at the time of injection molding was studied by varying the gate size and runner system.

A Study of Comparison with the Operating Priority Rules of RMGC on Semi-Automated Container Terminal (반자동화 컨테이너터미널의 RMGC 운영방식 비교 분석)

  • Kim, Chan-Ho;Ha, Tae-Young;Yang, Hong-Suk
    • Journal of the Korean Operations Research and Management Science Society
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    • v.35 no.2
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    • pp.1-17
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    • 2010
  • This paper aims to compare four operating priority rules of RMGC (Rail Mounted Gantry Crane) used in semi-automated container terminal. The four priority rules employed in this paper are FCFS (First-come-first-served), LCFS (Last-come-first-served), TOS (Turn-over-served) and NFS (Nearest-first-served). And to compare the four operating priority rules, this paper analyzed productivity of RMGC and CC (Container Crane), waiting time of YT (Yard Truck) and RT (Road Truck) in container yard, and turnaround time of RT in container terminal of each priority rule by using stevedoring simulation. As a result, NFS was evaluated as the best rule to improve the overall productivity of container terminal in terms of all criteria.

Priority-based Message Scheduling for Multi-agent System in Ubiquitous Environment (유비쿼터스 환경에서 멀티 에이전트 시스템을 위한 우선순위 기반 메시지 스케줄링 기법)

  • Yoon, Yang-Seok;Youn, Hee-Yong
    • Journal of Internet Computing and Services
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    • v.9 no.1
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    • pp.137-143
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    • 2008
  • In ubiquitous environment the multi-agent system is effective for providing intelligent services. In this paper we introduce a new scheduling service model for improving the communication performance in the multi-agent system. It is achieved by assigning a priority to the message according to the weight of formalized ACL message and the number of messages exchanged between the agents. An experiment reveals that the proposed approach allows smaller processing time per message and turnaround time than the scheduling with the existing JADE platform. Moreover, the proposed scheme allows a scalable messaging system.

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Gemini Observatory - a new opportunity for the Korean community

  • Kissler-Patig, Markus
    • The Bulletin of The Korean Astronomical Society
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    • v.39 no.2
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    • pp.40-40
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    • 2014
  • Through KASI, Korean astronomers will have access to the Gemini Observatory starting in 2015. Gemini operates two optical/infrared 8m-class telescopes: one on the northern hemisphere in Hawaii, one on the southern hemisphere in Chile. Both are equipped with state of the art instruments and adaptive optics systems that will be presented. Gemini also offers the opportunity for instrument development and welcomes visiting instruments. In terms of operations, Gemini offers to its partners three ways of applying for time: through semester-basis calls for standard programs, through yearly calls for Large and Long Programs, and through monthly calls for fast turnaround programs. Gemini operates in queue mode (observing for the principal investigators and allowing flexibility in the time domain), as well as in the classical visitor mode (where principal investigators come to the telescope). I will explain the requirements and advantages of all these modes as well as a full update on the Gemini Observatory.

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Utility Evaluation of Two-point Calibration Curve applied for TSH, FT4 Tests (TSH, FT4 검사의 Two-point Calibration Curve 적용의 유용성 평가)

  • Park, Hye-Mi;Yoo, Seon-Hee;Lee, Seon-Ho;Kim, Nyun-Ok
    • The Korean Journal of Nuclear Medicine Technology
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    • v.20 no.2
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    • pp.75-79
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    • 2016
  • Purpose The ASAN Medical Center, Nuclear Medicine performs TSH (Thyroid stimulating hormone) and FT4 (Free Thyroxine) tests 8 times per day. Accordingly, 70 ~ 80 kit tubes are consumed every day for the measurements and the time consumed for reagent dispensing averages over 170 seconds, where the TAT (turnaround time) may be effected when the number of test samples is larger than expected. Therefore, the following test was conducted with the purpose to reduce the number of kit tubes consumed, and reduce the time for reagent dispensing. Materials and Methods The test is based on applying the same reagent for tests where the number of samples is 30 or less. The test for TSH was conducted 9 times from July $1^{st}$ 2015 to July $10^{th}$ 2015. The test for FT4 was conducted 4 times from June $18^{th}$ 2015 to June $22^{nd}$, 2015. Standard Solution No.2 (0.153 uU/mL) and No.5 (4.96 uU/mL) was selected as the two-point standards for the TSH test, and Standard Solution No.3 (0.777 ng/dL) and No.4 (2.044 ng/dL) was selected as the two-point standards for the FT4 test. 38 test samples were subject to correlation analysis. Results For TSH, the result of the normal test shows ranges of 0.20 ~ 0.37 uU/mL for Control1, 0.53 ~ 0.71 uU/mL for Control2, and 6.77 ~ 7.94uU/mL for Control3, while the result of two-point calibration curve test shows ranges of 0.18 ~ 0.27 uU/mL for Control1, 0.53 ~ 0.71 uU/mL for Control2, and 7.30 ~ 8.52 uU/mL for Control3. For FT4, the result of the normal test shows ranges of 0.85 ~ 0.94 ng/dL for Control1 and 4.23 ~ 4.57 ng/dL for Control2, while the result of two-point calibration curve test shows ranges of 0.61 ~ 0.75 ng/dL for Control1 and 3.88 ~ 5.71 ng/dL for Control2. For TSH, the CV% of the normal test for Control1, Control2 and Control3 are 10.5, 3.3 and 3.6 respectively, while the CV% of the two-point calibration curve test for Control1 and Control1 are 12.4, 8.2 and 5.1 respectively. The result shows an outstanding correlation of TSH: y = 0.9985x - 0.0459 $R^2=0.9986$. For FT4, the CV% of the normal test for Control1 and Control2 are 0.70 and 0.71 respectively, while the CV% of the two-point calibration curve test for Control1 and Control1 are 8.7 and 16.2 respectively. The result shows an outstanding correlation of FT4: y = 1.2674x - 0.1133 $R^2=0.9824$. Conclusion The two-point calibration curve can be efficiently applied for TSH in cases where the number of test samples is not large, since the number of samples to be re-tested increases when the result is abnormal from the calibration curve. The two-point calibration curve test should not be applied for FT4 where the results do not consistently comply with the quality assessment range. Depending on how the two-point calibration curve is applied, up to 5 test tubes can be conserved per test, and the reduced time for reagent dispensing is anticipated to have a positive effect on the TAT (turnaround time).

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