• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 추계학술대회 논문집 학회본부 C
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• pp.1051-1053
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• 1999

In this work, thermal phenomena and temperature rise due to thermal source in electric switchboard were investigated using analytical measures. Electric switchboards are assemblies of panels on which are mounted switches, circuit breakers, high current busbars, meter, fuses and terminals essential to the operation of electric equipment. It is very difficult to predict the temperature rise in switchboard due to the existence of several heat sources. To overcome this situations, we focused on the eddy current distribution on the panel of switchboard caused by high current busbars as a fundamental basis. And thermal sources including busbar and switchgear have been considered. Furthermore, thermal transfer phenomena in switchboard was considered theoretically. Finally, three-dimensional thermal model for eddy current analysis has been adopted and FEM analysis was conducted. As a result, three-dimensional numerical analysis found to be applicable to the analysis of thermal phenomena in switchboard.

• 대한안전경영과학회지
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• 제14권2호
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• pp.1-9
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• 2012

As contemporary building construction type is getting higher and deeper, construction equipment usage is getting more, and related fatal accidents are on an increasing trend. Because of this, a method was drawn which could grasp the present state of construction equipment management and manage safety of the equipment more easily for accident prevention by choosing 2 kinds of Construction equipment which cause safety accident frequently among the equipment mainly used in construction site. This study suggested a method about construction equipment safety management using "smart phone" base which could be used in safety management for construction equipment by whomever in construction site. After attachment of QR code included safety checklist, It became possible that site managers could check more efficiently by scanning with their smart phone when they inspect equipment. Moreover, by the construction interested who didn't know what and how they have to inspect could point out unsafe condition in the early stage of equipment entering or take unsafe one out of the site by using new smart phone safety checking system is installed, it became possible that critical accident caused by construction equipment was prevented in advance.

• 한국정보통신학회논문지
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• 제20권6호
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• pp.1142-1147
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• 2016

최근 다양한 분야에 걸쳐 ICT 기술을 융합하여 지능적인 서비스를 제공하는 IoT에 대한 다양한 연구가 진행되고 있다. 특히 독일의 'Industry 4.0'의 등장으로 제조 산업에 ICT를 융합하여 생산능력을 극대화 하는 industrial IoT의 중요성이 강조되고 있다. 이에 국내에서도 industrial IoT의 근간이 되는 스마트 팩토리 보급을 위한 다양한 노력이 진행 중이다. 그러나 현재의 스마트 팩토리 시스템은 장비의 임베디드 시스템에 선언된 데이터를 통해 설비를 제어하며, 다수의 설비가 배치되어 있는 환경에 대처하기 어렵다. 본 논문에서는 industrial IoT를 위해 장비의 변수 정보를 DB화하여 장비를 제어하는 데이터베이스 접근 기반 장비 제어 시스템을 제안한다. 제안하는 시스템을 다양한 변수가 존재하는 사출 시스템에 적용하여 데이터베이스의 수정으로 다수의 장비를 제어하는데 효율적임을 확인하였다.

• 품질경영학회지
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• 제51권3호
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• pp.435-444
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• 2023

Purpose: To attain advanced performance certification, safety aspects along with functionality and performance are essential. Hence, this study suggests radiation leakage assessment methods for aviation security equipment during its performance certification. Methods: Detection technology guided the choice of radiation leakage assessment targets. We then detailed measurement and evaluation methods based on equipment type and operation mode. Equipment was categorized as container or box types for establishing measurement procedures. Results: We've developed specific radiation leakage assessment procedures for different types of aviation security equipment, crucial for ensuring airport safety. Using these procedures allows efficient evaluation of compliance with radiation leakage standards. Conclusion: The suggested radiation leakage assessment method aims to enhance aviation security and reliability. Future research will focus on identifying risks in novel aviation security equipment detection technologies and establishing safety standards.

• 산업경영시스템학회지
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• 제41권2호
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• pp.24-31
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• 2018

As a system complexity increases and technology innovation progresses rapidly, leasing the equipment is considered as an important issue in many engineering areas. In practice, many engineering fields lease the equipment because it is an economical way to lease the equipment rather than to own the equipment. In addition, as the maintenance actions for the equipment are costly and need a specialist, the lessor is responsible for the maintenance actions in most leased contract. Hence, the lessor should establish the optimal maintenance strategy to minimize the maintenance cost. This paper proposes two periodic preventive maintenance policies for the leased equipment. The preventive maintenance action of policy 1 is performed with a periodic interval, in which their intervals are the same until the end of lease period. The other policy is to determine the periodic preventive maintenance interval minimizing total maintenance cost during the lease period. In addition, this paper presents two decision-making models to determine the preventive maintenance strategy for leased equipment based on the lessor's preference between the maintenance cost and the reliability at the end of lease period. The structural properties of the proposed decision-making model are investigated and algorithms to search the optimal maintenance policy that are satisfied by the lessor are provided. A numerical example is provided to illustrate the proposed model. The results show that a maintenance policy minimizing the maintenance cost is selected as a reasonable decision as the lease term becomes shorter. Moreover, the frequent preventive maintenance actions are performed when the minimal repair cost is higher than the preventive maintenance cost, resulting in higher maintenance cost.

• 산업경영시스템학회지
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• 제15권26호
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• pp.95-98
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• 1992

In a recent years, there has been little change in basic mechanical and electrical design of material handling equipment. Reliability, safety. strength and controls have been improved. The most important change is sophisticated control and operation brough about by the tremendous improvement in computer capabilities. Even though the material handling equipment has been improved, material handling equipment must be selected properly. In this paper, the paper selection of material handling equipment using expert system will be presented.

• 대한산업공학회지
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• 제33권2호
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• pp.166-173
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• 2007

In this paper, we propose a model-based approach to estimating production parameters of semiconductor FAB equipment. For FAB scheduling, for example, we need to know equipment's production parameters such as flow time, tact time, setup time, and down time. However, these data are not available, and they have to be estimated from material move data such as loading times and unloading times that are automatically collected in modern automated semiconductor FAB. The proposed estimation method may be regarded as a Bayes estimation method because we use additional information about the production parameters. Namely, it is assumed that the technical ranges of production parameters are known. The proposed estimation method has been applied to a LCD FAB, and found to be valid and useful.

• 산업경영시스템학회지
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• 제37권4호
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• pp.193-201
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• 2014

This study attempts to utilize the economic efficiency analysis results focused on the break-even point as an indicator for the decision making of commanders and staff. We suggested a method of determining economic life by utilizing logistics information system and commercial program Minitab with a focus on the equipment's operational environment and performance data, whereas previously the equipment's retirement period was simply determined by the current equipment prices and sustainable period.

• 한국산학기술학회논문지
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• 제18권4호
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• pp.677-684
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• 2017

스마트 기기는 휴대하기 편리하고 애플리케이션이 개발이 쉬운 장점으로 다양한 산업 분야에 적용되고 있다. 그러나 산업용 장비 분야에서는 장비에서 제공되는 정보에 대한 보안 문제 및 원격지에서 장비의 액추에이터를 제어할 경우 사고가 발생할 수 있다. 본 논문에서는 위 문제에 대한 해결 방법과 스마트 제어 시스템을 산업용 자동화 장비에 적용할 경우 장점에 관한 연구를 수행하였다. 이런 문제 해결을 위해 장비 조작 시 발생할 수 있는 사고에 대해 질의를 이용한 매뉴얼 조작 방법과 스마트 기기를 이용한 장비 제어 시 스마트 제어 접근 허용 절차를 제안하였으며, 통신 데이터 보호 및 사용자 인증 방법으로 다중 암호화 프로토콜을 이용한 데이터 전송 방법과 단말기 고유 정보 및 Q&A를 이용한 사용자 인증 방법 제안하였다. 구현된 스마트 제어 시스템의 성능을 평가하기 위해 스마트 제어 시스템의 동작 실험과 사용자 인증 비교 실험을 하였으며, 장비에 적용 시 장점을 파악하기 위한 실험에서 스마트 제어 시스템은 티칭 팬던트 보다 편리하게 티칭 조작이 가능하였고, 다양한 정보 취득과 하드웨어 조작이 가능하였다. 또한, 스마트 제어 시스템 적용 시 장비의 에러 조치 시간을 약 13% 단축할 수 있었다.

• 한국주조공학회지
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• 제28권2호
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• pp.74-78
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• 2008

An integrated riser heating equipment has been developed to control shrinkage defects originated from casting of a marine propeller. The integrated riser heating equipment is composed of up/down moving parts, heating power source parts and an integrated controller. Heat capacity putting into the riser was calculated quantitatively on the base of a heat transfer analysis, which consisted of the establishment of heating model and the theoretical analysis for heat transfer. The riser heating equipment was evaluated through arc heating and electro-slag heating method. With the results, the arc type heating method was selected by considering high thermal efficiency, inexpensive cost, and convenient workship. This equipment improves the quality of a propeller casting and the poor working environment.