• Title/Summary/Keyword: operations efficiency

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Complex Agent for low alkalinity Deinking process of ONP (알칼리 저감형 신문지용 복합 탈묵제)

  • Yoon Kyoung-Dong;Park Heon- Sin;Kang Yun-Seog;Eom Tae-Jin
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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    • 2006.11a
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    • pp.9-14
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    • 2006
  • Deinking is a series of unit operations designed to detach ink from cellulose fibers and separate the dispersed ink from the pulp slurry. Deinking chemicals are process aids that enable expensive mill equipment used in these unit operations to operate more efficiently. This paper presents an overview of ONP deinking efficiency with cellulolytic enzymes and synthetic collector in low alkalinity process. The deinking efficiency of old news print even in low alkalinity condition was enhanced with enzyme contained complex agent. The brightness of deinked pulp was increased with less residual ink particles and yield of deinked pulp was improved compared to the deinked pulp of conventional alkaline method.

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An Expert System for Fault Restoration using Tree Search Strategies in Distribution System (트리탐색법을 이용한 사고복구 전문가시스템)

  • 김세호;최병윤;문영현
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.43 no.3
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    • pp.363-371
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    • 1994
  • This thesis investigates an expert system(ES) to propose fault restoration plan by utilizing tree search strategies. In order to cope with an extensive amount of data and frequent breaker switching operations in distribution systems, the database of system configuration is constructed by using binary trees. This remarkably enhances the efficiency of search algorithm and makes the proposed ES easily adaptable to system changes due to switching operations. The rule-base is established to fully utilize the meris of tree-structured database. The inferring strategy is developed mainly based on the best-first search algorithm to increase computation efficiency. The proposed ES has been implemented to efficiently deal with large distribution systems by reducing computational burden remarkably compared with the conventional ES's.

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A study on the application of RFID for ammunition management system (탄약관리 시스템에 RFID 적용방안 연구)

  • Park, Jin-Won;Choi, Seok-Cheol
    • Journal of the military operations research society of Korea
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    • v.31 no.2
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    • pp.13-27
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    • 2005
  • The most portion of the Korean Army's ammunition management system has achieved efficiency and automation based on the Ammunition Information System (AIS). However, a few limitations for the automation system constructed at each site, exist in verifying the real time situation. At the present state of technology, the asset visibility of the located ammunitions is basically achieved. On the other hand, the ammunitions in the middle of transportation are difficult to achieve asset visibility. The RFID(Radio Frequency Identification) technology could be an appropriate solution in these circumstances. Therefore, the objective of this paper is to apply the RFID to improve defense asset management, total asset visibility and ammunition distribution efficiency in the ammunition management system of the Korean Army.

Deep reinforcement learning for base station switching scheme with federated LSTM-based traffic predictions

  • Hyebin Park;Seung Hyun Yoon
    • ETRI Journal
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    • v.46 no.3
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    • pp.379-391
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    • 2024
  • To meet increasing traffic requirements in mobile networks, small base stations (SBSs) are densely deployed, overlapping existing network architecture and increasing system capacity. However, densely deployed SBSs increase energy consumption and interference. Although these problems already exist because of densely deployed SBSs, even more SBSs are needed to meet increasing traffic demands. Hence, base station (BS) switching operations have been used to minimize energy consumption while guaranteeing quality-of-service (QoS) for users. In this study, to optimize energy efficiency, we propose the use of deep reinforcement learning (DRL) to create a BS switching operation strategy with a traffic prediction model. First, a federated long short-term memory (LSTM) model is introduced to predict user traffic demands from user trajectory information. Next, the DRL-based BS switching operation scheme determines the switching operations for the SBSs using the predicted traffic demand. Experimental results confirm that the proposed scheme outperforms existing approaches in terms of energy efficiency, signal-to-interference noise ratio, handover metrics, and prediction performance.

The effect of nanoparticles on the economics study of railway logistics transport based on mathematical model

  • Yanlong Zhao;Mohsen Nasihatgozar;F. Ming
    • Advances in nano research
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    • v.16 no.5
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    • pp.521-529
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    • 2024
  • The integration of nanoparticles into various industries has spurred interest in understanding their impact on logistics and transportation systems. In this study, we investigate the effect of nanoparticles on the economic aspects of railway logistics transport using a mathematical model. By incorporating factors such as transportation costs, time efficiency, and environmental considerations, we aim to assess the overall economic feasibility of integrating nanoparticles into railway logistics operations. Through mathematical modeling and analysis, we explore how the introduction of nanoparticles affects cost-benefit analyses, resource allocation, and decision-making processes within railway logistics. Our findings provide valuable insights into the economic implications of nanoparticle integration in railway transport, offering potential strategies for optimizing logistics operations and enhancing overall efficiency and sustainability.

A Multi-interchange Simplex Method and its Computational Efficiency (다변환 심플렉스 기법과 이의 효율성)

  • Jeong Seong-Jin;Lee Myeon-U;Lee Chang-Hun;Gang Seok-Ho
    • Journal of the military operations research society of Korea
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    • v.11 no.1
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    • pp.79-86
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    • 1985
  • A multi-interchange simplex method is presented. This method tries to cut almost half of the set of convex combinations which generate all decreasing feasible directions. Analysis of this method indicates high possibility of the existence of polynomial-time simplex-type methods.

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Redundancy Optimization under Multiple Constraints (다제약식하에서의 최적중복설계에 관한 연구)

  • Yun Deok-Gyun
    • Journal of the military operations research society of Korea
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    • v.11 no.2
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    • pp.53-63
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    • 1985
  • This paper presents a multi-costraint optimization model for redundant system reliability. The optimization model is usually formulated as a nonlinear integer programming (NIP) problem. This paper reformulates the NIP problem into a linear integer programming (LIP) problem. Then an efficient 'Branch and Straddle' algorithm is proposed to solve the LIP problem. The efficiency of this algorithm stems from the simultaneous handling of multiple variables, unlike in ordinary branch and bound algorithms. A numerical example is given to illustrate this algorithm.

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A Study on the Improvement of the Doctrine, Organization and Training Affair for Weapon Systems (무기 체계 전력화 지원요소 업무 개선방안)

  • 윤현석;최석철
    • Journal of the military operations research society of Korea
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    • v.29 no.2
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    • pp.111-130
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    • 2003
  • This paper deals with the improvement of doctrine, organization, and training for Weapon systems during the defense acquisition process. We analyze the combat development element such as doctrine, organization, and training which is working in the United States of America. then we apply the ideas to our proposal for the improvement of doctrine, organization, and training for weapon systems. This paper will be contributed to the improvement of doctrine, organization, and training and the efficiency of defense acquisition program management.

A study on improvement of nuclear power plant main control room environment - focus on lighting (원자력 발전소 주제어실(MCR) 환경 개선에 관한 연구 - 조명환경을 중심으로)

  • Ryu, Je-Hyeok;Byeon, Seung-Nam
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2004.05a
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    • pp.664-667
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    • 2004
  • In nuclear power plant, the main control room(MCR) plays a leading and important role, so it is the core to have its design well operater-centered, both physically and cognitively. This paper especially analyzes focusing on lighting MCR environment and shows alternatives. It will lead to improve work efficiency and to care operator's sight. In conclusion, reducing operator's stress, fatigue and increasing safety, comfort.

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TOC Buffer Management using the Concept of the Postponement (Postponement 개념을 이용한 TOC 버퍼 관리)

  • 한지은
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2001.10a
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    • pp.275-278
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    • 2001
  • TOC(Theory of Constraints) - the emphasis of this philosophy was on identifying and eliminating constraints(bottle-necks) in the system. TOC solves this and optimizes whole system by improving manufacturing constraints that limit system result. In this paper, it is shown that the concept of the "delayed differentiation" can be applied for enhancing the efficiency of the time buffer and thus reducing the of the time buffer.

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