• Journal of the Korea Institute of Military Science and Technology
• /
• v.22 no.5
• /
• pp.599-606
• /
• 2019

The Arena Fragmentation Test(AFT) is one of the important tasks for designing a high-explosive warhead. In order to measure the statistics of a warhead in the test, fragments of a warhead that penetrate steel plates are detected by using complex and expensive measuring equipment. In this paper, instead of using specific hardware to measure the statistics of a warhead, we propose to use an image processing based object detection algorithm to detect fragments in AFT. To this end, we use a hard-thresholding method with a brightness feature and apply a morphology filter to remove noise components. We also propose a simple yet effective temporal filtering method to detect only the first penetrating fragments. We show that the performance of the proposed method is comparable to that of a hardware system under the same experimental conditions. Furthermore, the proposed method can produce better results in terms of finding exact positions of fragments.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2005.05a
• /
• pp.80-83
• /
• 2005

The competitiveness of the manufacturing company is evaluated in terms of line productivity, quality cost, inventory level, logistics efficiency, and so on. The productivity is defined by the number of products divided by the number of workers within the given operation time. Increasing the productivity is not easy to man-operated situation in the line, since it heavily depends on the standard time of the workers. This paper deals with the productivity of the Back Light Unit assembler for TFT-LCD, and proposes the methodology of investigating the optimal process by simulation of Arena.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.35 no.3
• /
• pp.62-69
• /
• 2012

This thesis proposes a new social network simulator, which can be used for the social network analysis (SNA). It is composed of three modules; initialization, network evolution, and output generation. For the network evolution module, we suggest a modified JGN (MJGN) based on JGN, the network evolution model developed by Jin, Girvan, and Newman. Arena, one of the most popular simulation tools, was used to model the agent based social network simulator. Lastly, some test results were presented to show the value of the proposed simulator when one performs SNA at the longitudinal point of view.

• Proceedings of the Korean Information Science Society Conference
• /
• 2007.10b
• /
• pp.408-413
• /
• 2007

최근 인구와 기계문명의 발달로 예전에 비해 좀더 복잡한 응급 사고가 발생하고 있다. 현재 응급 구조 시스템은 타인에 의한 신고나 정적인 웹페이지로 수집된 정보를 통해 당시 상황에 맞춰 응급 체계를 수립하고 있다. 이는 비전문 의료인인 구급대원의 현장 판단과 의료기관으로의 부적절한 판단으로 인해 응급 환자의 적절한 치료의 가능성을 낮추는 요인이 될 수 있다. 따라서 선행연구로써 기존의 응급 의료 시스템에 멀티 에이전트 개념을 도입하여 멀티 에이전트 기반의 응급 의료 시스템(MAEMS)을 모델링하였다. 멀티 에이전트 시스템은 독립적인 성격과 자율적인 성격으로 않은 부분에 응용되어 설계되고 있다. 특히 에이전트의 독립적인 성격은 이질적인 환경에서 동일한 목적의 행위를 수행할 수 있으며, 동적으로 많은 변화가 있는 상황에서 자율적으로 판단하여 행동할 수 있다. 본 논문에서는 MAEMS에 구성되어 있는 각 에이전트를 구현하며, ARENA를 통해 시뮬레이션함으로써 실제 통계자료와 비교하여 멀티 에이전트를 도입한 응급 의료 시스템의 효율성에 대해 연구한다.

• Journal of the Korea Society for Simulation
• /
• v.18 no.3
• /
• pp.35-45
• /
• 2009

Emergency medical center(EMC) is the place for patients who need medical treatment immediately due to a disease, childbirth, or all sorts of accidents. Currently, most of EMCs use temporary beds because regular EMC beds cannot afford to serve all incoming patients. However, since it decreases the quality of service(QoS) of EMC patients and their guardians and efficiency of the EMC, some improvements are highly required to diminish the usage of temporary beds. The system duration time is one of the typical QoSs. This thesis proposes the information which is critical to make a better decision for cut down the number of temporary beds without sacrificing QoS of patients. The key point is to control the duration time of medical treatments for the consultation and hospitalization process, since it is the major reason of overcrowding in EMC and the usage of temporary beds. In this paper, we proposed an Arena simulation model reflecting real world substantially. Arena is one of the most widely accepted simulation softwares in the world. Using the developed model, we can obtain the optimal EMC operation parameters through simulation experiments. Optquest, included in the Arena, is used to make the developed simulation model collaborate with an optimization model. The results showed one can determine the set of optimal operation parameters decreasing the required number of temporary beds without deteriorating EMC patient's QoS.

• Korean Architects
• /
• s.516
• /
• pp.40-45
• /
• 2012

• Journal of the Korea Society for Simulation
• /
• v.22 no.4
• /
• pp.119-128
• /
• 2013

We need to consider a number of technical constraints to build new warehouses. In particular, it is essential to assure that the flow of trucks is smooth and seamless even in large size warehouses. The flow of trucks in warehouses are subject to, for instance, the routes of trucks, the frequency and the time stamps of their in-and-out's. Also, the routes of trucks interfere each other. Thus, finding good flow of trucks in a warehouse is a tough task when all interferences among trucks are considered. In this paper, we find some layouts of the routes of trucks exhibiting good performance based on simulation. we use ARENA ver. 11 for simulation.

• Korean journal of applied entomology
• /
• v.32 no.1
• /
• pp.61-67
• /
• 1993

Experiments were conducted to study the functional response of Amblyseius longispinosus Evans to egg densities (10-80) of Tetranychus urtica Koch under different egg distributions (clumped & uniform) and arena sizes (3, 9 & 16 $cm^2$). The searching success of A. longispinosus was affected by the spatial distribution and density of the prey but not by the arena size. there was a highly significant negative correlation (r=-0.85; p=0.0001) between predation amount and distances between preys. The predation response showed a type III functional response. The random predator equation satisfactorily described A. longispinosus predation. The search rate ranged from 0.1030 to 0.1504 under distribution of the prey while it ranged from 0.0546 to 0.276 under uniform distribution.

• Proceedings of the Korea Society for Simulation Conference
• /
• 2001.10a
• /
• pp.263-268
• /
• 2001

In this paper, we present a new heuristic algorithm fur buffer allocation in FMS (Flexible Manufacturing System). It is conducted by using a genetic algorithm and simulation. First, we model the system by using a simulation software, \"Arena\". Then, we apply a genetic algorithm to achieve an optimal solution. VBA blocks, which are kinds of add-in functions in Arena, are used to connect Arena with the genetic algorithm. The system being modeled has seven workstations, one loading/unloading station, and three AGVs (Automated Guided Vehicle). Also it contains three products, which each have their own machining order and processing times. We experimented with two kinds of buffer allocation problems with a proposed heuristic algorithm, and we will suggest a simple heuristic approach based on processing times and workloads to validate our proposed algorithm. The first experiment is to find a buffer profile to achieve the maximum throughput using a finite number of buffers. The second experiment is to find the minimum number of buffers to achieve the desired throughput. End of this paper, we compare the result of a proposed algorithm with the result of a simple buffer allocation heuristic based on processing times and workloads. We show that the proposed algorithm increase the throughput by 7.2%.t by 7.2%.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2002.05a
• /
• pp.750-754
• /
• 2002

현대 기업 경영환경의 가장 큰 변화는 개개의 기업들이 기업전체의 효율성과 이익의 향상을 위해서 공급망 (Supply Chain)에 대하여 많은 관심을 기울이기 시작했다는 것이다. 여기서 공급망이란 원료의 조달부터, 중간재로의 가공 및 유통, 최종제품의 생산 및 배송까지의 기능을 수행하기 위한 설비와 유통 채널의 네트워크를 말하며, 모든 기업들은 원자재에서 최종소비자의 형태로 공급망에 참여한다, 결국 공급망의 형태는 산업과 기업에 따라서 매우 복잡하고 다양할 수밖에 없는데, 원재료의 수급에서 고객에게 제품을 전달하는 자원과 정보등 일련의 흐름전체를 경쟁력 있는 업무의 흐름으로 관리하려는 관리 시스템이 공급망 관리(SCM :Supply Chain Management )인 것이다. 기업들의 공급망 관리에 대한 관심이 증대하는 반면에 고객 수요패턴의 불확실성이나 급변하는 기업환경 등 여러 외부 입력 값들의 변화에 따라 효율적인 공급망 구성을 위한 연구는 부족한 실정이다. 이러한 문제를 해결하기 위해 최근 시뮬레이션을 적용한 공급망 시뮬레이터(SCS : Supply Chain Simulator )에 많은 관심이 집중되고 있다. 본 연구에서는 SCS 의 일종인 Arena Professional Edition과 공급망 관리의 성과를 측정하고 개선분야를 직접적으로 파악할 수 있는 SCOR (Supply Chain Operations Reference Model)을 이용하여 제조기업의 효율적인 SCM 의사결정에 대해서 알아보고자 한다.