• 한국철도학회논문집
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• 제11권4호
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• pp.364-370
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• 2008

최근 무선통신 및 USN(Ubiquitous Sensor Network) 기술의 확대로 다양한 환경에서 정보를 수집, 가공 할 수 있게 되었다. 특히 센서들의 크기가 소형화되면서 노드의 개수도 많아짐에 따라 이웃노드와의 채널간섭 및 충돌, 에너지 소모 등의 문제가 대두되었다. 본 논문에서는 지하공간에서 효율적인 통신을 위하여 비컨을 사용하고 TinyOS기반으로 설계 및 구현하여, 멀티홉 메쉬 구조에 적합한 무선 센서 네트워크를 구축하였다. 구현한 프로토콜은 비컨 간의 충돌방지를 위한 스케줄링을 제공하여 안정적인 Association이 가능하도록 하였으며, NAA(Next Address Assignment) 기법을 이용하여 동적인 주소할당과 재사용을 지원한다. 또한 실시간 정보처리를 위한 지식정보 서버를 구축하였다. 끝으로 실제 테스트베드 구축을 통하여 화재, 대기오염 등 다양한 환경에서의 높은 전송률을 가짐을 보인다.

• 산업경영시스템학회지
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• 제41권4호
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• pp.138-145
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• 2018

In the field of optimization, many studies have been performed on various types of Vehicle Routing Problem (VRP) for a long time. A variety of models have been derived to extend the basic VRP model, to consider multiple truck terminal, multiple pickup and delivery, and time windows characteristics. A lot of research has been performed to find better solutions in a reasonable time for these models with heuristic approaches. In this paper, by considering realtime traffic characteristics in Map Navigation environment, we proposed a method to manage realistic optimal path allocation for the logistics trucks and cargoes, which are dispersed, in order to realize the realistic cargo mixing allowance and time constraint enforcement which were required as the most important points for an online logistics brokerage service company. Then we developed a prototype system that can support above functionality together with delivery status monitoring on Map Navigation environment. First, through Map Navigation system, we derived information such as navigation-based travel time required for logistics allocation scheduling based on multiple terminal multiple pickup and delivery models with time constraints. Especially, the travel time can be actually obtained by using the Map Navigation system by reflecting the road situation and traffic. Second, we made a mathematical model for optimal path allocation using the derived information, and solved it using an optimization solver. Third, we constructed the prototype system to provide the proposed method together with realtime logistics monitoring by arranging the allocation results in the Map Navigation environment.

• 한국전자통신학회논문지
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• 제19권2호
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• pp.453-466
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• 2024

한정된 정점과 인력 기반의 조사로 실제 국내 표착되는 해안 쓰레기의 총용량 추정이 어려운 우리나라의 해안 쓰레기 모니터링 방식 개선을 위해 비관리 해변에서 UAV(: Unmanned Aerial Vehicle) 이미지와 RT-DETR 모델을 기반으로 해안 쓰레기 탐지하고 현장 조사와의 비교 연구로 해안 쓰레기의 정량적 탐지 및 자연 해안선 기준 우리나라에 표착되는 전체 쓰레기 총용량 추정 가능성을 제시하였다. RT-DETR(: Realtime DEtection TRansformer) 모델 학습 결과 mAP@0.5는 0.894, mAP@0.5:0.95는 0.693의 정확도를 보였다. 모델을 비관리 해변에 적용한 전체 해안 쓰레기 개수에 대한 정확도는 72.9%로 나타났다. 본 연구와 비관리 해변에 대한 모니터링을 정의하는 관리지침 마련 연구가 동반된다면 우리나라에 표착되는 전체 해안 쓰레기의 총 용량 추정이 가능할 것으로 기대된다.

• 한국멀티미디어학회논문지
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• 제18권5호
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• pp.583-598
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• 2015

We need many assembly lines to produce industrial product such as automobiles that require a lot of composited parts. Big portion of such assembly line are still operated by manual works of human. Such manual works sometimes cause critical error that may produce artifacts. Also, once the assembly is completed, it is really hard to verify whether of not the product has some error. In this paper, for monitoring behaviors of manual human work in an assembly line automatically, we proposes a realtime hybrid monitoring system that combines 2D vision sensor tracking technique with 3D motion recognition sensors.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2006년도 추계 종합학술대회 논문집
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• pp.516-519
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• 2006

본 연구는 RFID 기술을 이용하여 소각재 재활용 공정의 정보를 효율적 관리하고, 정확한 데이터를 이용하는 일원화된 시스템을 구축하기 위하여 데이터 모니터링 시스템을 설계하고자 한다. 이를 위하여 데이터베이스를 구축하고 이를 관리하는 시소러스 검색 모델을 개발하였으며, 모니터링 시스템의 RFID 모델을 설계하였다. 안정적인 소각재 재활용을 위한 데이터 모니터링 시스템의 개발은 산업체 전반에 걸쳐있는 기계화, 수작업화 된 공정을 실시간 자동화 공정으로 개발하는 효율적인 방법이 될 것이다.

• 대한산업공학회지
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• 제40권1호
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• pp.34-42
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• 2014

SCADA and DCS that have performed automatic control and monitoring activities increase the productivity of enterprise in industries. In such systems, although their performance had been improved, there are still many deficiencies in predictive maintenance which can foresee the risk of any kinds of accidents. Because the data acquisition systems of main facilities are being distributed throughout the whole plant and therefore, integration of data obtained from the systems is very difficult. Accordingly, techniques that acquire meaningful information from the gathered data through realtime analysis still need to be improved. This paper introduces a developed facility monitoring system which can predict equipment failure and diagnose facility status through big data analysis to improve equipment efficiency and prevent safety accidents.

• 한국멀티미디어학회논문지
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• 제19권8호
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• pp.1505-1515
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• 2016

The age of autonomous vehicles has come according to development of high performance sensing and artificial intelligence technologies. And importance of the vehicle's surrounding environment sensing and observation is increasing accordingly because of its stability and control efficiency. In this paper we propose an integrated platform for efficient networking, analysis and monitoring of multiple sensing data on the vehicle that are equiped with various automotive sensors such as GPS, weather radar, automotive radar, temperature and humidity sensors. From simulation results, we could see that the proposed platform could perform realtime analysis and monitoring of various sensing data that were observed from the vehicle sensors. And we expect that our system can support drivers or autonomous vehicles to recognize optimally various sudden or danger driving environments on the road.

• 산업공학
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• 제12권3호
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• pp.374-381
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• 1999

In this paper, we propose an architecture of the DNC system for Shop Floor Control/Point of Production(SFC/POP). The DNC system to be presented this paper retrieves line-up sheets which include the drawing information, making a index database for line-up sheets, NC programs and tool adjustment data. And it is interface with a raw material, jig and tool information. Also, the DNC system transmits operation information to real workers rapidly, and supports realtime monitoring by collecting the state information of machines directly. In the analysis and design phases, this paper models realtime events using the state transition diagrams. In the implementation phase, we use the ORACLE DBMS(Database Management System) as the DBMS and Developer 2000 and Microsoft Visual C++ 5.0 as the programming tools.

• 대한임베디드공학회논문지
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• 제7권4호
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• pp.193-199
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• 2012

Virtualization allows multiple commodity operating systems to share on a single physical machine. Resource allocation among virtual machines is a key to determine virtual machine performance. To satisfy time-sensitive task on a domain, hypervisor needs to observe the resource requirements and allocates proper amount of CPU resources in a timely manner. In this paper, we propose a realtime credit scheduler for latency sensitive application on virtual machines. The key idea is to register a time event in the Xen hypervisor. Experiment result shows that the proposed scheme is superior to Credit scheduler.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2014년도 춘계 학술논문 발표대회
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• pp.50-51
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• 2014

Although price of construction equipment affects overall cost of a construction projects, the cycle of updating them presented in the Poom-Saem in Korea is more than six years. Recently there is a demand of using the 'Standard Market Price of Construction Equipment', published by the ministry of Security and Public Administration, for estimating equipment operating and ownership cost. It is urgent to introduce an advanced system for updating the prices which can timely reflect market changes.