• Journal of Bio-Environment Control
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• v.7 no.4
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• pp.324-329
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• 1998

Effect of roof slope on the transmissivities of direct and diffuse solar radiation using a computer simulation model developed by Kim and Lee(1997) was analyzed for 10-span glasshouse located in Seoul(37$^{\circ}$34' N), Chonju(35$^{\circ}$49' N) and Cheju(33$^{\circ}$31' N). Transmissivities of diffuse solar radiation in glasshouse with roof slopes of 15, 20, 24.6, 30 and 35 degree were calculated as 61.3, 61.6, 61.7, 56.8 and 58.6%, respectively. Transmissivities of direct solar radiation(TDSR) during the period except summer season were highly affected by the roof slope. During the winter season, TDSR in glasshouse with roof slopes of 30 and 35 degree were higher than those with other roof slopes. Also, during the period except winter season, TDSR in glasshouse with roof slope of 20 degree were higher than those with other roof slopes. Difference in TDSR with latitude was significant during the period from October to February. At this period TDSR were highly appeared at lower latitude. Effect of roof slope on TDSR in S-N greenhouse was smaller than those in E-W greenhouse. It is considered that direct solar radiation highly transmitted in the glasshouse with roof slope of 20 degree.

• Korean Journal of Construction Engineering and Management
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• v.23 no.2
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• pp.33-44
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• 2022

The simulation function by the 4D system is a representative BIM function in the construction stage. For the 4D simulation, schedule information for each activity must be created and then linked with the 3D model. Since the 3D model created in the design stage does not consider schedule information, there are practical difficulties in the process of creating schedule information for application to the construction stage and linking the 3D model. In this study, after extracting the schedule information of the construction stage using the HDBSCAN algorithm from the 3D model in the design stage, authors propose a methodology for automatically generating schedule information by identifying precedence and sequencing relationships by applying the topological alignment algorithm. Since the generated schedule information is created based on the 3D model, it can be used as information that is automatically linked by the common parameters between the schedule and the 3D model in the 4D system, and the practical utility of the 4D system can be increased. The proposed methodology was applied to the four bridge projects to confirm the schedule information generation, and applied to the 4D system to confirm the simplification of the link process between schedule and 3D model.

• Journal of the Korea Institute of Military Science and Technology
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• v.15 no.1
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• pp.36-45
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• 2012

In this thesis, we propose an integrated simulation method of virtual tank simulators and an entity-based constructive simulation model for small unit tactical training. To do this, we first identify requirements for virtual-constructive integrated simulation in a synthetic environment. We then propose a virtual and constructive interoperation method where individual combat entities of virtual-constructive models are interacting with each others. We develop a method of aggregating individual combat entities into a larger combat unit and disaggregating an unit into entities from time to time. We also present a way of sharing synthetic environment information between the models. Finally, we suggest that for more effective interoperability, virtual and constructive models should be developed by using common combat object models. The proposed interoperation method can be extended to further live-virtual-constructive models.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.14 no.4
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• pp.34-42
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• 2015

As the industry environment is changing to automated systems, engineering education at university has changed with industrial development. Industry technology will be developed, and the industry environment will become more complicated. Therefore, the knowledge that undergraduates have to acquire in university will be extensive. Industries need a person with expertise to react quickly to rapidly changing technology. Therefore, universities need to endeavor to cultivate manpower in technical fields. This is difficult because the contents of engineering education must react quickly to rapidly changing industry technology. This paper proposes a hardware-linked simulation platform for engineering education on the well-used systems in industrial sites.

• Journal of the Korea Society for Simulation
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• v.15 no.1
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• pp.43-50
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• 2006

The major objective of this paper is to propose a hybrid simulation environment for autonomous UAV system by integrating the continuous-time model with discrete-event model. Proposed system is able to support high autonomous behavior by combining the planner, recognizer, and controller model to deal with the HL20 AIRPLANE model. Thus, the high level decision may be efficiently issued even upon the unexpected circumstance. The proposed system model has been successfully verified by several simulation test performed on the DEVS simulation S/W environment.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.2
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• pp.165-170
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• 2013

This paper proposes a method of simplification for robot simulation creation using functional concise script. General robotics simulation authoring tools require professional knowledge regarding development language and their APIs, and these prerequisites are considered as a big obstacle in implementing robotics simulation. In order to resolve these problems, we developed an authoring tool using functional concise script in building simulation environment, and this concise script composes of simplified service commands and minimum options. In experiment, we educated students and teachers in High school to use this authoring tool and we verified that the proposed method makes it possible to build robotics simulation environment and control simulated robots through one-day training course for the novices.

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.138-138
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• 2011

GTL(Gas to Liquid) 합성유 생산 공정은 크게 합성가스 개질공정(reformer), FT 반응공정, upgrading 공정으로 구성된다. 본 연구에서는 FT 반응기에 유입되는 합성가스의 생산공정인 개질공정 최적화 시뮬레이션을 수행하였다. 기존에 HYSYS 공정 모사 tool로 구현한 개질공정 모델에 dynamic simulation을 적용하여 공정 운전 시간 변화에 따른 온도/압력/조성의 일정범위 별 생산 가스의 성분비를 모사하고자 한다. Dynamic 공정 시뮬레이션은 모사 대상 공정의 운전 시간 별 결과값 변화를 산출할 수 있는 방법으로 기존 정상상태(steady-state) 시뮬레이션에 비해 현실 공정의 운전 변수를 보다 더 정확하게 반영할 수 있는 장점이 있다. 본 시뮬레이션은 1bpd급 GTL 파일럿 플랜트의 설계 자료를 근거로 수행되었으며, 향후 운전 데이터를 feedback하여 최적의 운전 매뉴얼 도출자료로 활용코자 한다. 아울러, 다음의 시간 변화별 모사 결과 데이터들을 산출하고 공정의 최적운전 조건을 분석하고자 한다. - 시간에 따른 공정의 온도/압력 변화, 이에 연동되는 반응기 출구의 1) $H_2$/CO 비율, 2) $CH_4$ conversion, 3) $CO_2$ conversion 본 연구의 결과 데이터를 1bpd급 GTL 플랜트 내 합성가스 개질공정의 운전조건 최적화에 적용코자 하며, 이는 개질반응기의 안정적인 연속운전을 통한 GTL 통합공정의 운전 효율향상에 기여 가능하리라 기대된다. 향후 개질공정의 후단공정인 FT 합성공정 시뮬레이션 과업과 연계하여 GTL 통합공정 시뮬레이션 및 최적화에 따른 실증 규모의 스케일업 기반 데이터를 마련할 수 있을 것이다.

• Journal of KIISE:Information Networking
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• v.27 no.2
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• pp.237-246
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• 2000

A broadband access network in B-ISDN subscriber network, plays a role of concentration or multiplexing of various subscribers into a service node. For call and connection control functions, DSS2 and B-ISUP signalling protocols are standardized for each of a subscriber side and a network node. B-BCC and B-ANCC protocol were proposed for VB5.2 interface. This interface allows dynamic control of ATM connections at the broadband access network. To establish an end-to-end ATM connection, interworking functions between VB5.2 interface's connection control protocol and the signalling protocol, are performed at the service node. A sequential interworking model and a parallel interworking model were proposed for these interworking functions. The sequential interworking model recommended by ITU-T causes an overall connection setup delay by introducing the access network, because this model proceeds the signalling protocol of network node after the response of VB5.2 interface protocol. On the other hand, the parallel interworking model proceeds the signalling protocol and the VB5.2 interface protocol simultaneously. The simultaneity of the parallel interworking model minimizes the overall connection setup delay. In this paper, we analyze and simulate above two interworking models with B-BCC or B-ANCC protocol in terms of a connection setup delay and completion ratio.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.1
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• pp.119-126
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• 2015

In this paper, we propose a 3D visualization system that expresses the simulation results of port container operation monitoring and planning in terms of the movements of the surrounding environment including static and dynamic objects. It also enables us to objectively evaluate the operation model by way of animating the actual port operations. With XML-based design of object states, the port simulator visualization system (PSVS) that we propose has been implemented so as to maximize the interoperability with the existing port operation simulation (CATOS), and express the realtime animation of large-scale objects. The design method of PSVS system is explained, and its validity is experimentally examined.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.8
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• pp.3319-3325
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• 2012

This paper describes the development of the TrackSim, which is a discrete event simulation tool for photolithography equipment of semiconductor industry. The TrackSim is focused on the accurate simulation model of the photolithography equipment and easy-to-use user interfaces. TrackSim provides 3D simulation environment for evaluating, validating, and scheduling the photolithography process. One of the major characteristics of TrackSim is in that it is developed based on Applied Materials' AutoMod, a discrete event simulation software broadly used in semiconductor industry. Accordingly, the photolithography model of TrackSim can be used to perform simulation connected with other simulation models built with AutoMod.