• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 춘계 학술논문 발표대회
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• pp.132-133
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• 2015

Efficient scheduling and resource management are the key factor to reduce construction project budget (e.g., labor cost, equipment cost, material cost, etc.). Resource-based line of balance (LOB) technique has been used to complement the limitations of time-driven scheduling techniques (e.g., critical-path method). Optimizing construction alternatives contributes cost savings while honoring the project deadline. However, existing LOB scheduling is lack of identifying optimal resource combination. This study presents a method which identifies the optimal construction alternatives, hence achieving resource minimization in a repetitive construction by using genetic algorithm (GA). The method provides efficient planning tool that enhances the usability of the system.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.158-160
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• 2015

Efficient scheduling and resource management are the key factor to reduce construction project budget (e.g., labor cost, equipment cost, material cost, etc.). Resource-based line of balance (LOB) technique has been used to complement the limitations of existing time-driven scheduling techniques (e.g., critical-path method). Optimizing construction alternatives contributes to cost savings while honoring the project deadline. However, existing LOB scheduling is lack of identifying optimal resource combination. This study presents a method which identifies the optimal construction alternatives, hence achieving resource minimization in a repetitive construction by using genetic algorithm (GA). The method provides efficient planning tool that enhances the usability of the system.

• Journal of Communications and Networks
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• 제11권1호
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• pp.36-41
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• 2009

The IEEE 802.16 wireless metropolitan area network (WMAN) standard is designed to correct expensive communication costs in CDMA-based mobile communication systems and limited coverage problems in wireless LAN systems. Thus, the IEEE 802.16e standard can provide mobile high-speed packet access between mobile stations and the Internet service provider through the base station with cheap communication fees. To efficiently accommodate voice over IP (VoIP) services in IEEE 802.16 systems, an uplink quality of service packet-scheduling scheme is proposed, and its performance is evaluated with an NS-2 network simulator in this paper. Numerical results show that this proposed scheme can increase the system capacity by 100% more than in the unsolicited rand service (UGS) scheme and 30% more than the extended real-time polling service (ertPS) scheme, respectively.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2004년도 학술대회지
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• pp.61-66
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• 2004

In this paper an effort is made to develop an innovative spatial arrangement concept pertaining to ship building industry. The spatial scheduling is the problem that concentrates on effective planning of available space and arrangements of blocks and in a priority manner. In order to create an effective spatial scheduling. a database providing the priority has to be available to make the erection sequence. Such a system works hand in hand with erection sequence generator program The erection sequence program works on the conventional network analysis method which uses a typical parent-children idea for the calculation of the ENT(possible earliest network start time) and LNT(possible latest network start time). This program works in a cyclic manner taking turns by calculating the ENT in upward trace and LNT on the return trace thereby generating the entire erection sequence diagram for the requisite problem The generated database serves as an input data for spatial scheduling problem. When the system works it takes into consideration the entire system based on heuristic concepts as mentioned. There system uses the spatial aspects such as the available area of the P. E area and plan area of the corresponding blocks and its priority of erection from the erection sequence generator program develops the spatial scheduling arrangement. In this paper using all these concepts an innovative spatial schedule development system developed.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2000년도 춘계공동학술대회 논문집
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• pp.135-138
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• 2000

This paper is intended to propose what manufacturing configuration (manufacturing planning and shop floor control) is suitable for the tire industry. Basically tire-manufacturing process is mixed-products, parallel-disconnected-flow-shop. Both throughput time and cycle tine are very short, the variety of tires is very high, the setup time is long, shop floor data reporting requirements is high, and there are many equipments and people working. And with no exception, tire industry also now confronts increasing requirements of delivery conformance with the above peculiar characteristics of tire manufacturing and changing market environments, this paper suggests, weekly master scheduling with no MRP is desirable and traditional kanban is right selection for shop floor control/scheduling. This paper describes why this configuration should be, using the manufacturing engineering principles and some new insights like four primitives of parallel flow shop. Generally known that shop with high parallel-product-mix and long setup time isn't good candidate for kanban. The four primitives of parallel flow shop explain why kanban is also useful scheduling technique in that environment.

• International Journal of Internet, Broadcasting and Communication
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• 제14권1호
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• pp.53-63
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• 2022

In the paper, we propose a TSCH-based scheduling scheme for IEEE 802.15.4e, which is able to perform the scheduling of its own network by avoiding collision from interference network cluster (INC). Firstly, we model a bipartite graph structure for presenting the slot-frame (channel-slot assignment) of TSCH. Then, based on the bipartite graph edge weight, we utilize the Hungarian assignment algorithm to implement a scheduling scheme. We have employed two features (maximization and minimization) of the Hungarian-based assignment algorithm, which can perform the assignment in terms of minimizing the throughput of INC and maximizing the throughput of own network. Further, in this work, we called the scheme "dual-stage Hungarian-based assignment algorithm". Furthermore, we also propose deep learning (DL) based deep neural network (DNN)scheme, where the data were generated by the dual-stage Hungarian-based assignment algorithm. The performance of the DNN scheme is evaluated by simulations. The simulation results prove that the proposed DNN scheme providessimilar performance to the dual-stage Hungarian-based assignment algorithm while providing a low execution time.

• 한국인터넷방송통신학회논문지
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• 제17권5호
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• pp.43-49
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• 2017

본 논문에서 QoS가 보장될 수 있는 IoT 망을 위한 IEEE802.15.4e TSCH(Time-Slotted Channel Hopping) 기술을 살펴보고 표준에서 다루지 않는 디바이스들 간의 협력에 의한 링크 스케줄링 방법에 대해서 제안한다. 네트워크에 조인하는 디바이스는 개선된 비콘을 스캔한다. 광고노드로부터 수신 한 개선된 비콘프레임은 디바이스들 간에 직접 통신이 가능한 링크 정보를 포함하고 있으며, 새로운 디바이스는 이를 통해 자신의 채널오프?과 타임슬롯을 결정하게 된다. 기존 단일채널 IEEE802.15.4와 본 제안을 활용한 TSCH 방식의 성능을 최대 스루풋과 최소 지연시간 관점에서 비교 분석한다.

• 전자공학회논문지CI
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• 제47권1호
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• pp.135-145
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• 2010

분산 이기종 컴퓨팅 시스템(Distributed Heterogeneous Computing System, DHCS)에서 방향성 비순환 그래프(Directed Acyclic Graph, DAG)의 효율적인 스케줄링은 시스템의 높은 성능을 만드는데 매우 중요한 역할을 한다. 본 논문은 DHCS에서 고성능의 새로운 스케줄링 알고리즘인 LCFT(Levelized Critical First Task)을 제안한다. LCFT 알고리즘은 DHCS에서 스케줄링을 위해 효율적인 태스크 선택 방법을 이용하는 리스트 스케줄링 기반의 알고리즘이다. LCFT 알고리즘의 복잡도는 $O(\upsilon+e)(p+log\;\upsilon)$을 갖는다. LCFT의 성능 비교를 위해 다양한 DAG 그래프를 이용하여 기존의 알고리즘인 PETS, HPS, HCPT, GCA와 스케줄링의 길이와 속도를 실험하였으며 실험 결과 LCFT 알고리즘이 다른 알고리즘 보다 성능 향상이 있는 것을 확인할 수 있었다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 춘계학술대회
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• pp.593-594
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• 2015

In wireless sensor networks (WSNs), due to the very low data rate, the sleeping schedule is usually used to save consumed energy and prolong the lifetime of nodes. However, duty-cycled approach can cause a high end-to-end (E2E) delay. In this paper, we study a node scheduling algorithm in WSNs such that E2E delay meets bounded delay with a given probability. We have applied the probability theory to spot the relationship between E2E delay and node interval. Simulation result illustrates that we can create the network to achieve given delay with prior probability and high energy use efficient as well.

• 디지털콘텐츠학회 논문지
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• 제8권3호
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• pp.279-288
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• 2007

최근 다중프로세서 실시간 시스템 환경에서 최적인 Pfair 스케줄링(PF) 알고리즘[1]이 Baruah 등에 의해 제안되었고, 이를 기반으로 하는 몇 가지 스케줄링 알고리즘들이 제안되었는데 이들은 모두 고정된 퀀텀 크기를 가정하고 있다. 전역 스케줄링 기법인 Pfair 기반 스케줄링 알고리즘에서 퀀텀 크기는 태스크 교환과 캐시 재적재와 같은 스케줄링 오버헤드에 직접적인 영향을 미치게 된다. 이에 따라 태스크 집합에 대한 최적 퀀텀 크기를 결정하기 위한 방법이 제안되었으며[2], 모든 태스크들의 주기와 실행 요구 시간이 $e\;{\leq}\;p/3+1$의 성질을 만족하는 제한적 특성의 태스크 집합에 대해서 보다 효율적으로 최적 퀀텀 크기를 결정할 수 있는 방법[3]이 제안된 바 있다. 그런데 이들 방법에서는 최적의 퀀텀 크기를 결정하기 위해 반복적으로 프로세서의 이용률을 계산하였다. 본 논문에서는 이러한 제한적 특성의 태스크 집합에 대해서 프로세서 이용률 계산을 반복적으로 수행하지 않고 상수 시간에 최적 퀀텀 크기를 결정할 수 있는 보다 효율적인 방법을 제안한다.