• Title/Summary/Keyword: 복수 결함

Search Result 632, Processing Time 0.027 seconds

Optimizing dispatching strategy based on multicriteria heuristics for AGVs in automated container terminal (자동화 컨테이너 터미널의 복수 규칙 기반 AGV 배차 전략 최적화)

  • Kim, Jeong-Min;Choe, Ri;Park, Tae-Jin;Ryu, Kwang-Ryul
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
    • /
    • 2011.06a
    • /
    • pp.218-219
    • /
    • 2011
  • This paper focuses on dispatching strategy for AGVs(Automated Guided Vehicle). The goal of AGV dispatching problem is allocating jobs to AGVs to minimizing QC delay and AGV total travel distance. Due to the highly dynamic nature of container terminal environment, the effect of dispatching is hard to predict thus it leads to frequent modification of dispatching results. Given this situation, single rule-based approach is widely used due to its simplicity and small computational cost. However, single rule-based approach has a limitation that cannot guarantee a satisfactory performance for the various performance measures. In this paper, dispatching strategy based on multicriteria heuristics is proposed. Proposed strategy consists of multiple decision criteria. A muti-objective evolutionary algorithm is applied to optimize weights of those criteria. The result of simulation experiment shows that the proposed approach outperforms single rule-based dispatching approaches.

  • PDF

Optimizing dispatching strategy based on multicriteria heuristics for AGVs in automated container terminal (자동화 컨테이너 터미널의 복수 규칙 기반 AGV 배차전략 최적화)

  • Kim, Jeong-Min;Choe, Ri;Park, Tae-Jin;Ryu, Kwang-Ryul
    • Journal of Navigation and Port Research
    • /
    • v.35 no.6
    • /
    • pp.501-507
    • /
    • 2011
  • This paper focuses on dispatching strategy for AGVs(Automated Guided Vehicle). The goal of AGV dispatching is assigning AGVs to requested job to minimizing the delay of QCs and the travel distance of AGVs. Due to the high dynamic nature of container terminal environment, the effect of dispatching is hard to predict thus it leads to frequent modification of dispatching decisions. In this situation, approaches based on a single rule are widely used due to its simplicity and small computational cost. However, these approaches have a limitation that cannot guarantee a satisfactory performance for the various performance measures. In this paper, dispatching strategy based on multicriteria heuristics is proposed. The Proposed strategy consists of multiple decision criteria. A multi-objective evolutionary algorithm is applied to optimize weights of those criteria. The result of simulation experiment shows that the proposed approach outperforms single rule-based dispatching approaches.

Diagnostic Imaging of Liver Cirrhosis in a Shih-Tzu Dog (시츄견에서 발생한 간경화의 영상 진단)

  • Choi, Ho-Jung;Lee, Ki-Ja;Chang, Jin-Hwa;An, Ji-Young;O, I-Se;Ahn, Se-Joon;Jeong, Seong-Mok;Park, Seong-Jun;Cho, Sung-Whan;Lee, Young-Won
    • Journal of Veterinary Clinics
    • /
    • v.26 no.4
    • /
    • pp.367-370
    • /
    • 2009
  • A 5-year-old, intact female Shih-Tzu dog was presented with 1 year history of icterus, ascites and anorexia. The serum biochemistry revealed elevated liver enzyme levels. Microhepatica and decreased serosal detail were detected in abdominal radiography. Abdominal ultrasonographic findings included irregular liver margins, multifocal hypoechoic nodules in the liver parenchyma, and ascites. Computed tomography (CT) showed multifocal hypodense nodules with ring-like contrast enhancement. Cytologic and histopathologic examination by liver core biopsy revealed fibrosis. Cirrhosis was diagnosed based on above results. This report focuses on the imaging characteristics of ultrasonography and CT for liver cirrhosis in a dog.

Effect of the distance between the adjacent injectors on penetration and mixing characteristics of the jet in supersonic crossflow (수평 배치된 분사구의 배치 간격에 따른 초음속 유동장 내 분사 유동의 침투 및 혼합 특성)

  • Kim, Sei Hwan;Lee, Hyoung Jin
    • Journal of Aerospace System Engineering
    • /
    • v.12 no.4
    • /
    • pp.81-89
    • /
    • 2018
  • In the present study, a numerical investigation was conducted to analyze the effect of the distance between the adjacent injectors on the characteristics of flow structure, fuel penetration, and air/fuel mixing. Numerical results were validated with experimental data using a single injection. Subsequently, the same injector geometry and properties were applied on a non-reacting flow simulation with multiple injectors. Total pressure loss, penetration height, and mixing efficiency were compared with the distance between the injectors. The results showed that each injected gas merged into a single stream, resulting in the 2D-like flow fields under the condition of short distance and lower mixing efficiency along with higher total pressure loss. When the distance between the injectors increased, total pressure loss reduced and mixing efficiency increased due to the weakening of interactions between the injected gases.

Advanced reactivation algorithm after recover ins on Home-based Distributed Shared Memory (홈기반 분산공유메모리 상에서 결함복구후 향상된 재실행 알고리즘)

  • 김용국;하금숙;유은경;이성우;유기영
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2001.10c
    • /
    • pp.844-846
    • /
    • 2001
  • 홈기반의 분산 공유메모리 모델은 지금 현재 가장 적은 외부 통신비용을 가진 프로토콜 모델이다. 본 논문에서는 기존의 Recoverpoint와 Recoverpoint Server를 이용한 결함허용모델 (Checkpoint Model)을 보다 향상시키기 위하여 향상된 결함복구후 재실행 알고리즘을 제안한다. 이 알고리즘은 피기백(Piggyback)방식과 복수개의 Checkpoint를 사용하며 기존의 Vector Time Stamp 기법시스템보다 더 낳은 확장성과 실행속도를 제공한다.

  • PDF

The optimizing in fuzzy queueing system(Multi-server) (퍼지 대기행렬에 있어서 최적화(복수창구))

  • 이교원
    • Journal of the Korean Institute of Intelligent Systems
    • /
    • v.10 no.2
    • /
    • pp.168-174
    • /
    • 2000
  • All the visiting customers makes a queue and then can be served at an unoccupied server, in the queueing system of multi-server. The customer and server, however, have a conflictive feeling of satisfaction at all times. To solve the problem, in this paper, it is proposed that new design method of server number to maximize the satisfaction level of customer and server by the hzzy concept which is applied to the queuing system.

  • PDF

복수를 동반하는 넙치(Paralichthys olivaceus) 병증예에 대한 병리조직학적 관찰

  • 허민도;강형길;최희정;정현도;조병열;박정희;이월라;이무근
    • Proceedings of the Korean Society of Veterinary Pathology Conference
    • /
    • 2001.09a
    • /
    • pp.32-32
    • /
    • 2001
  • 2000년 4월 1일 경, 경북 구룡포소재 넙치양식장에서 임상적으로 채색흑화 및 복수의 저류를 동반하며 1 주일만에 총 10 만미 중 약 2%(2,000미)가 급성 폐사하는 질병이 발생하였다. 발병 당시의 수온은 13~14$^{\circ}C$, 염분농도는 32~33$ extperthousand$로 측정되었다. 세균검사 및 외부기생충 검사에서는 음성이었다. 본 질병은 저수온기 넙치에서 발병하는데, 작년 4월에 발증예가 실험실로 의뢰된 적이 있으며 올해에는 2월 말경부터 경북 포항 및 남해 상주에서도 발증ㆍ폐사되기 시작하여 넙치 양식장에 큰 피해를 입히고 있다. 따라서 이들 질병예에 대한 병리조직학적 검사를 실시하였기에 그 결과를 보고하고 가능 원인체에 대하여 고찰하고자 하였다. (중략)

  • PDF

Detection Filter of Pulmonary Nodules Shadow in Chest X-ray Images (흉부 X선 영상에서 폐 종류 음영 검출필터)

  • Kim, Eung-Kyeu;Lee, Dok-Yeom
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2007.06c
    • /
    • pp.440-445
    • /
    • 2007
  • 본 논문에서는, 폐 종류 음영검출에 대해서 다중해상도 필터를 에너지 차분 영상에 적용하여 기존 방법과의 비교평가 및 폐 종류 음영검출 자체에 관하여 그 검출성능에 영향을 주는 요인을 선택해서 분석을 하였다. 다시말해서, 폐 종류 음영 검출자체에 관해서 복수의 분석인자를 선택해서 복수의 관점에서 성능을 분석하였다. 즉, 영상 인자로서 보통 X선 영상 및 에너지 차분영상을, 검출필터 인자로서 라플라시안-가우시안 필터, 최소방향 차분필터 및 본 연구에서 제안하는 다중해상도 필터를 선택해서 분석을 하였다. 그 결과, 폐 종류 음영검출에 있어서 에너지 차분 영상의 유효성, 최소방향 차분필터의 보통 X선 영상에서의 효과 및 다중해상도 필터의 에너지 차분 영상에 있어서의 유효성을 식견으로서 터득하게 되었다.

  • PDF

Performance Modeling of Multibuffered Multistage Interconnection Networks under Nonuniform Traffic Pattern with Small Clock Cycle Schemes (복수버퍼를 가진 다단상호연결네트웍의 비균일 트래픽 환경하에서 소클럭주기를 사용한 성능 평가)

  • Mun Youngsong
    • Journal of Internet Computing and Services
    • /
    • v.5 no.5
    • /
    • pp.61-68
    • /
    • 2004
  • In this paper, a more accurate model than any other ones so far have been proposed for the performance evaluation of muntibuffered banyan-type Multistage Interconnection Networks(MINs)'s under nonuniform traffic condition is obtained. Small clock cycle instead of big clock cycle is used to improve the performance. The accuracy of the proposed model is conformed by comparing with the results from simulation.

  • PDF

Basic Economic Evaluation of Industrial Complex CHP based on the type of Turbine (산업단지 열병합 발전 방식의 터빈 형식에 따른 기초경제성 평가)

  • Seo, Young-Ho;Lee, Joon-Hee;Cho, Chung-Sik;Jeon, Yong-Han;Yeom, Won-Sik
    • Proceedings of the KAIS Fall Conference
    • /
    • 2011.12b
    • /
    • pp.624-627
    • /
    • 2011
  • 본 논문에서는 산업단지에 공정증기를 공급하는 열병합 발전소 건설에 대한 타당성 분석시 적용되는 경제성 분석에 대한 것으로, 동일한 보일러 및 주증기 그리고 공정증기 조건하에서 배압터빈 및 복수터빈 적용시 수반되는 경제성 분석을 통해 타당성 있는 시스템을 선정하는데 그 목적이 있다. 복수터빈 방식이 배압터빈 방식에 비해 전력생산량은 약 3배정도 많으나 초기 시설투자비의 증대 및 상대적인 에너지 활용측면에서 낮은 결과를 나타냈다.

  • PDF