• 한국BIM학회 논문집
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• 제10권4호
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• pp.60-69
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• 2020

Allowing on-site workers to access information of the construction process can enable task control, data integration, material and resource control. However, in the current practice of the construction industry, the existing methods and scope is quite limited, leading to inefficient management during the construction process. In this research, by adopting cutting edge technologies such as Augmented Reality(AR), digital twins, deep learning and computer vision with wearable AR devices, the authors proposed an AR visualization framework made of virtual components to help on-site workers to obtain information of the construction process with ease of use. Also, this paper investigates wearable AR devices and object detection algorithms, which are critical factors in the proposed framework, to test their suitability.

• Journal of the Korean Wood Science and Technology
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• 제19권2호
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• pp.72-76
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• 1991

• 한국통신학회논문지
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• 제16권11호
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• pp.1167-1178
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• 1991

전투지역 환경의 특징을 조사하고 요구되는 네트워크 성질을 고려하여 그 성질에 적합한 네트워크 제어구조를 설계한다. 또한 네트워크의 제어구조를 구성하며 제어구조에서 형성된 근간 네트워크에서의 전송계획을 작성하기 위한 분산 제어 알고리즘을 설계한다. 전투지역에서 변화하는 네트워크의 연결성 유사와 노드의 파괴로 인한 네트워크의 즉각적인 재구성을 신뢰성 있게 하기 위한 분산 알고리즘과 또한 공통 채널을 이용하는 네트워크에서 노드간에 전송충돌이 없는 전송 계획은 작성하기 위한 분산 알고리즘을 제안한다. 특히 중요한 노드가 파괴 및 사라질 때 되도록 적은 지연을 통해 네트워크가 동작할 수 있는 방법을 제안한다. 그리고 제안된 분신 알고리즘을 시뮬레이션을 통해 검증하고 네트워크 동작에 관해 설명한다.

• Journal of Communications and Networks
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• 제12권3호
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• pp.266-274
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• 2010

The efficient network resource management is one of the important topics in a real-time system. In this paper, we present a practical network resource management framework, control-theoretic packet scheduler (CPS) system. Using our framework, an operating system can schedule both input and output streams accurately and efficiently. Our framework adopts very portable feedback control theory for efficiency and accuracy. The CPS system is able to operate independent of the internal network protocol state, and it is designed to schedule packet streams in fine-grained time intervals to meet the resource requirement. This approach simplifies the design of the CPS system, and leads us to obtain the intended output bandwidth. We implemented our prototype system in Linux, and measured the performance of the network resource management system under various network QoS constraints. The distinctive features of our principles are as follows: It is robust and accurate, and its operation is independent of internal network protocols.

• 상하수도학회지
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• 제20권2호
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• pp.197-206
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• 2006

The leakage in the water distribution system means both the loss of money and water resource. To minimize the leakage, we introduced the pressure control method using the pressure reducing valve and pump schedule. For the pressure control, the total leakage is needed to divide into each node. In this study, EPANET 2.0 was used to simulate the water networks in two selected blocks after the total leakage was distributed with each node by four ways. The leakage was allocated into each node as water measured by meter, water pressure, water faucets and Lpcd and simulated by EPANET 2.0. Regardless of the leakage distribution ways, there was no significant difference between the measured water and the estimated water pressure. Thus, the leakage distribution way using water pressures estimated by simulation could be recommended. The scenarios controlling the pressure reducing valve and pump were made in two blocks(A and B). $86,713m^3/year$ leakage in the A block and $11,442m^3/year$ in the B block could be reduced as controlling the pressure reducing valve and pump schedule. It was shown that the fifty million won a year can be saved in the A block and 6.8 million won in the B block.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1992년도 춘계학술대회 논문집
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• pp.301-305
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• 1992

A mold plant is characterized by complex processes, frequent schedule changes, and lots of troubles. In order to control the production in mold plant efficiently, huge amount of informations are to be managed in the appropriate way. In this paper, a modular software system for production control is described, which is located between a higher level production planning system and a process control system. It contains the functions such as order processing, operations scheduling and control, tool managemant, NC program managememt including DNC functions, production data acquisition and progress control and statistics.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1531-1535
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• 2008

The Tester of Autonomous station control system is a system which can test the main function of Autonomous station control system through the data field. The purpose of this paper is to meet the system requirements and design a main function, menu and user interface using Use-case. The main function is a time-deadline test, a schedule broadcast test, a route control test and a version-up test, etc. The design of Autonomous station control system tester plays a primary role of the important document for the upcoming future system development of the tester.

• 한국건설관리학회논문집
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• 제5권1호
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• pp.124-132
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• 2004

대부분 국내 건설현장의 인력관리는 협력업체별 당일 출역현황만을 관리하고 있다. 그러나 이와 같은 인력관리 방법은 적정투입 인력 및 생산성 확인, 계획대비 실투입 인력의 오차를 명확히 파악할 수 없기 때문에 이로 인해 발생하는 공기지연을 사전에 예방할 수 없는 한계를 가지고 있다. 이는 건설현장에서 공정계획과 인력자원이 상호 유기적으로 연계된 관리 노력의 부재에 그 원인이 있다. 따라서 건설현장의 공정관리 능력향상을 통하여 공정계획을 기반으로 한 체계적인 협력업체 인력관리의 필요성이 요구된다. 본 고에서는 CPM 공정표에 인적자원을 연계하여 관리할 수 있는 변혁 프로그램으로써 일일공정 Check System을 개발하였다. 또한 실제 공사 중인 아파트현장의 골조공사에 이를 적용하여 본 시스템의 활용 타당성과 효과를 검증하였다.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2006년도 정기학술발표대회 논문집
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• pp.722-726
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• 2006

LCI(Lean Constrcution Institute)에 의해 개발되어진 라스트 플래너(Last Planner System)은 Master Schedule, Phase Schedule, Lookahead Schedule, Weekly Work plan의 4단계로 이루어진다. 본 연구는 LSP의 4단계 중 Weekly Work Plan 단계에서 이루어지는 PPC(Percent of Plan Completed)의 측정 프로세스에 초점을 맞추고 있다. PPC 적용에 따른 여러 가지 장점에 대해서는 이미 해외 여러 나라에 의해 소개되어진 바 있지만, 아직까지 우리나라에서 PPC란 용어 자체가 낯선 상황이며, PPC 관련 연구가 미흡한 실정이다. 따라서, 본 연구는 한국 건설산업에 PPC를 도입하기에 앞서 라스트 플래너 시스템의 공정관리체계와 국내 공정관리체계를 비교 ${\cdot}$ 분석함으로써 우리나라 현실에 적합한 작업성취율 측정을 위한 공정관리절차를 제시하고 이를 도입하기 위해 선행되어져야할 사항에 대해 제시하고자 한다.

• 한국정밀공학회지
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• 제18권5호
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• pp.57-64
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• 2001

The high speed in the wire-drawing process to meet the demands for the increased productivity has a great effect on the heat generated due to plastic deformation and friction between the wire and the drawing dies. During the high carbon steel wire drawing process, the temperature rise gives a great influence to the fracture of wire. In this paper, to control the temperature rise in the wire after the deformation through the drawing die, the calculation method of the wire temperature, which includes the temperature rise in the deformation zone as well as the temperature drop in the block considering the heat transfer among the wire, cooling water and surrounding air, is proposed. These calculated results of the wire temperature at the inlet and exit of the drawing die at each pass are compared with the measured wire temperatures and verified its efficiency. So, using the program to predict the wire temperature, the isothermal pass schedule program was developed. By applying this isothermal pass schedule program to the conventional process condition, a new isothermal pass schedule is redesigned through all passes. As a result, the possibility of wire fracture could be considerably reduced and the productivity of final product could be more increased than before.