• Annual Conference of KIPS
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• 2017.11a
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• pp.66-69
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• 2017

Volunteer Computing 환경에서 프로젝트 서버가 클라이언트들의 유휴 컴퓨팅 자원을 효율적으로 활용하기 위한 연구는 활발하게 진행되었으나, 프로젝트 서버로부터 받아온 외부작업과 클라이언트의 고유작업 사이에서 발생하는 성능간섭을 최소화시키기 위한 연구는 미비하다. 본 논문은 대표적인 Volunteer Computing 플랫폼인 BOINC 환경에서 외부작업이 클라이언트의 고유작업에 미치는 성능간섭을 확인하기 위한 다양한 실험을 수행하였으며, 그 원인에 대한 분석을 제시하였다. 실험 결과 고유작업의 쓰레드 수가 증가하거나 전체 연산에서 I/O 작업의 비중이 높을수록 성능간섭이 늘어나는 사실을 확인하였다. 이러한 연구의 결과는 사용자가 Volunteer Computing 어플리케이션을 운영할 시 고유작업의 특징을 고려하여 성능간섭을 최소화 하는 옵션을 설정하는 목적에 활용될 것으로 기대된다.

• Korean Journal of Construction Engineering and Management
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• v.14 no.5
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• pp.175-187
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• 2013

Each participant in building construction project requires their own workspace to execute their activities. In this environment, inappropriate workspace planning in construction site causes workspace conflicts which result in a loss of productivity, safety hazard and poor-quality issues. Therefore, workspace should be regarded as one of the most important resources and constraints have to be managed at construction site. However, current construction planning techniques such as Gantt chart, network diagram and critical path method have proven to be insufficient to workspace planning. This paper contains formalized process for workspace planning in 4D BIM environment to prevent workspace related problems in construction project. The proposed process in this paper represents workspace occupation status for each activity and suitable solutions for identified workspace conflicts by integrating workspace attributes and activity execution plan. Based on the result of this study, project manager will be able to prevent probable workspace conflicts and negative effect on project performance by devising appropriate workspace plan during preconstruction phase.

• Annual Conference of KIPS
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• 2020.05a
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• pp.342-344
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• 2020

3차원 CAD를 이용한 선박 설계는 완료 시점에서 부품간의 간섭여부를 판별할 수 있으나 작업순서에 따른 파트의 회전이나 이동 중의 간섭에 대한 판단은 어렵다. 현재는 생산 현장의 작업반장이나 숙련인력이 파트에 대한 회전, 이동시의 간섭 여부를 판단하여 작업순서를 조절한다. 이에 본 논문에서는 Unity 엔진을 이용하여 의장 작업을 실행하기 전에 대상 파트를 손으로 직접 회전, 이동시켜서 실제 작업이 가능한지 여부를 확인할 수 있는 AM 뷰어를 구현하고자 한다.

• The KIPS Transactions:PartC
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• v.16C no.6
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• pp.737-746
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• 2009

Given the increased interest in ubiquitous computing, wireless sensor network has been researched widely. The localization service which provides the location information of mobile user, is one of important service provided by sensor network. Many methods to obtain the location information of mobile user have been proposed. However, these methods were developed for only one mobile user so that it is hard to extend for multiple mobile users. If multiple mobile users start the localization process concurrently, there could be interference of beacon or ultrasound that each mobile user transmits. In the paper, we propose APL(Adaptive Power Control based Resource Allocation Technique for Efficient Localization Technique), the localization technique for multiple mobile nodes based on adaptive power control in mobile wireless sensor networks. In APL, collision of localization between sensor nodes is prevented by forcing the mobile node to get the permission of localization from anchor nodes. For this, we use RTS(Ready To Send) packet type for localization initiation by mobile node and CTS(Clear To Send) packet type for localization grant by anchor node. NTS(Not To Send) packet type is used to reject localization by anchor node for interference avoidance and STS(Start To Send) for synchronization between 모anchor nodes. At last, the power level of sensor node is controled adaptively to minimize the affected area. The experimental result shows that the number of interference between nodes are increased in proportion to the number of mobile nodes and APL provides efficient localization.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.6
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• pp.1911-1918
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• 2014

The increase of input resources, such as labor and equipment, in a construction project causes workspace interference between activities and it influences on the productivity and quality of construction activities. To solve this problem, many studies related to the workspace interference have been performed, however they verified the workspace concerning with only the geometric location of activities or generated the shape of workspace by a whole object concept not separated units of detailed operations. It is difficult for project manager to reasonably analyze the workspace conflict, because the size of workspace cannot reflect the characteristics of an activity and input time of a resource. This paper presents a methodology that can generate three-dimensional models in order to optimize the workspace shape and size by considering with the characteristics of each activity and input time of each resource. The suggested method can be used for the active BIM system that optimizes the workspace conflict without additional construction duration and for the searching algorithm of optimized moving path for construction equipment.

• Journal of the Korean Society for Precision Engineering
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• v.11 no.3
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• pp.175-183
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• 1994

간섭무늬기술을 효과적으로 사용하기 위하여, 간섭무늬 데이터를 빠르고 정확하게 간단히 줄여나가는 것이 필수적이다. 그러나, 심한 잡음이 존재할 때 현재 사용하는 방법을 적용하면 위상풀이에 오차가 생기거나, 무늬치수선정에 문제가 생겨, 근본적으로 대화식 수정작업이 필요하다. 결국 이러한 수동식 작업은 좀더 나은 완전한 자동해석을 위해 전문가시스템으로 대체할 수 있을 것이라 기대하여 왔다. 이 논문에서는 빠르고 기준 지식으로 조작할 수 있으며, 또한 유연성이 있는 새로운 통합 전문가시스템을 제시하였다. 이러한 조건을 만족 시키기 위해 고속 알고리즘에 적합한 C언어를 이용하여 전문가시스템의 쉘을 구성하였다. 이렇게 개발한 시스템이 간섭무늬해석의 전체 진행과정을 수행하게 하였다. 즉, 언어변환 해석을 하지 않고도 기준지식의 확보, 간섭 및 설명을 할 수 있으며 영상판독, 영상수정, 영상분할 및 형상추출 등을 수행하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.6
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• pp.1493-1504
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• 2010

The localization service which provides the location information of mobile user, is one of important service provided by sensor network. Many methods to obtain the location information of mobile user have been proposed. However, these methods were developed for only one mobile user so that it is hard to extend for multiple mobile users. If multiple mobile users start the localization process concurrently, there could be interference of beacon or ultrasound that each mobile user transmits. In the paper, we propose LME, the localization technique for multiple mobile nodes in mobile wireless sensor networks. In LME, collision of localization between sensor nodes is prevented by forcing the mobile node to get the permission of localization from anchor nodes. For this, we use CTS packet type for localization initiation by mobile node and RTS packet type for localization grant by anchor node. NTS packet type is uevento reject localization by anchor node for interference avoidance.nghe experimental result shows that the number of interference between nodes are increased in proportion to the number of mobile nodes and LME provides efficient localization.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.29 no.1
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• pp.413-421
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• 2005

Intra-block remarshalling is the task of rearranging into some target bays those containers which are scattered within around the block. If multiple transfer cranes installed in the block are all used together we may be able to complete the remarshalling task as early as possible. However, when multiple cranes are used simultaneously, there may occur significant delays if we do not carefully consider interferences between the cranes at the time of scheduling. Especially, delays caused by interferences occur more frequently in case of using non-crossing cranes. This paper presents an efficient heuristics method for assigning moves of containers to each crane and for determining an appropriate container moving order in a manner sensitive to the interferences. Simulation experiments have shown that the proposed method can effectively reduce delays in various environments.

• Journal of Navigation and Port Research
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• v.29 no.5 s.101
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• pp.447-455
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• 2005

Intra-block remarshalling is the task of rearranging into some target bays those containers which are scattered within around the block. If multiple transfer cranes installed in the block are all used together we may be able to complete the remarshalling task as early as possible. However, when multiple cranes are used simultaneously, there may occur significant delays if we do not carefully consider interferences between the cranes at the time of scheduling. Especially, delays caused by interferences occur more frequently in case of using non-crossing cranes. This paper presents an efficient heuristic method for assigning moves of containers to each crane and for determining an appropriate container moving order in a manner sensitive to the interferences. Simulation experiments have shown that the proposed method can effectively reduce delays in various environments.

• The KIPS Transactions:PartC
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• v.16C no.1
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• pp.91-100
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• 2009

Given the increased interest in ubiquitous computing, wireless sensor network has been researched widely. The localization service which provides the location information of mobile user, is one of important service provided by sensor network. Many methods to obtain the location information of mobile user have been proposed. However, these methods were developed for only one mobile user so that it is hard to extend for multiple mobile users. If multiple mobile users start the localization process concurrently, there could be interference of beacon or ultrasound that each mobile user transmits. In the paper, we propose IAL, the localization technique with interference avoidance for multiple mobile nodes in mobile wireless sensor networks. In IAL, interference is prevented by forcing the mobile node to get the permission of localization from anchor nodes. For this, we define LIP packet type for localization initiation by mobile node and LGP packet type for localization grant by anchor node. LRP packet type is used to reject localization by anchor node for interference avoidance. The experimental result shows that the number of interference between nodes are increased in proportion to the number of mobile nodes and IAL provides efficient localization.