• Journal of Science and Technology Studies
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• v.9 no.2
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• pp.79-102
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• 2009

This study reviews the issue of public interests of technologies required in industrial technology policy as well as the demand for changes in industrial technology policy as result of the migration from catch-up to post catch-up innovation system. In fact, the importance of public interests which served as the rationale for government intervention in industrial technology policy have gradually faded, which invited controversies over the legitimacy and effectiveness of government intervention in promoting specific technologies or industries. Today, the existing policy framework has to change to correspond to the post catch-up environment which requires creative technology development. In this context, the Korean government needs to reduce direct support for certain companies or technologies, but increase R&D investment in energy, environment and health and welfare to enhance public interests of technology innovation activities.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1998.05a
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• pp.73-78
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• 1998

상용 IGCC발전소의 특징적 공정흐름에 대한 분석기술의 확보를 위해 PDU급 IGCC발전계통에 대한 성능평가와 NOx 배출에 대한 모델링을 수행하였다. 향후 IGCC발전소 건설시 선정가능성이 있는 4가지 가스화 공정에서 생산되는 석탄가스를 연료로 하고, 그 발전계통의 대상 가스터빈은 산업현장에서 사용되고 있는 GE사의 LM1600PA를 선정하였다. 석탄가스는 천연가스에 비해 가스터빈의 효율과 출력 상승을 가져오나, 이와 동시에 압축기 탈설계점 작동문제를 야기 시킬 수 있다. 또한 NOx 발생량은 석탄가스 연소시 급격히 증가하며, NOx 제어를 위해 질소분사가 이루어져야 함을 알 수 있었다.

• Proceedings of the KIEE Conference
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• 1999.11b
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• pp.309-311
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• 1999

대용량의 전원단지를 포함한 전력계통에서 기간 송전선로(Route) 고장발생시 해당 계통내 동기 탈조의 불안정 현상을 보이는 발전기들의 동기탈조를 방지하기 위한 사고파급방지장치(FPPC:Fault Propagation Preventive Controller)의 기본 구성, 알고리즘 현장시험 및 적용시 설치효과에 대해 검토하였다. 전원용량이 클수록 발전기 차단 제어 완료까지 요구되는 시간은 짧아지며, 제어 요구량 또한 증가한다. 따라서 제어완료까지의 시간을 최대한 짧게 하기 위한 시스템설계 및 오동작 발생을 방지하기 위한 Fail-safe 기능을 S/W와 H/W적으로 구성하였다.

• Vending industry
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• v.2 no.4 s.5
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• pp.49-52
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• 2002

자판기가 꾸는 최고의 꿈은 무엇일까, 그것은 아마도 완전 무인화를 통해 유통의 모든 것을 대신하는 오토피아의 세계일 것이다. 자판기를 미래지향적 유통기기라 하는 것도, 또 산업계가 현재의 가능성보다는 내일을 더욱 중시하며 인고의 길을 마다하지 않는 이유도 분명 그 세계를 향한 꿈에 있을 게다. 이런 점에서 볼 때 최근 시장전개라 모색되는 오토 샵 시스템은 자판기의 미래지향적 꿈에 가장 근접한 기종이라 할 수 있다. 구성에 따라서는 수백가지 아이템을 인력 없이 판매할 수 있는 이 무인 시스템은 오토피아 세계를 향한 가능성의 시험대로서도 기대가 크다. 무인화에 있어서는 결코 한번 간 길은 되돌아가지 않는다. 일단 무인화가 되기가 힘들어서 그렇지 일정 단계에 도달하면 다시 유인으로 되돌아가기에는 너무 익숙하고 편해져 있게 마련이다. 오토 샵 시스템 역시 이 같은 흐름을 제대로 탈 수 있다면 오토피아의 대표주자로서 빠른 파급력을 기대해 볼 수 있다. 하지만 결코 쉽지 않은 길. 누구도 가지 않았기에 험난하고 힘들 수밖에 없는 그 길 위에서 오토피아 꿈들을 아직은 가능성 하나만을 믿고 매달려야 하는 시점이다. 금호 현장진단에서는 키오스텍에서 전개하는 '솔드아웃'을 통해 오토샵 시장의 가능성을 진단해 보는 시간을 마련했다.

• Proceedings of the KWS Conference
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• 2009.11a
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• pp.26-26
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• 2009

TIG 용접은 고품질이고 용접인자의 제어가 쉽고 정확하다는 장점이 있지만, 얕은 용입과 낮은 생산성과 같은 단점이 있다. TIG 오비탈 용접에서는 용입의 한계 때문에 작은 루트면과 넓은 그루브를 가공하여 다층 용접을 하며, 루트패스에서는 파이프 진원도에 의한 핏업 시 단차의 문제가 자주 발생하여 많은 현장에서 루트갭을 만들어 수동 용접하는 실정이다. 따라서 생산성이 낮으며 생산 단가가 높고 용접 품질이 작업자에 따라 다르게 된다. 이러한 문제점을 해결하여 자동 오비탈 용접을 위해 단차를 흡수 할 수 있는 용접 공정 개발이 필요하다. 본 연구의 목적은 TIG 용접에서 단차에 따른 용접성을 검토하여 이를 맞대기 용접에 적용했을 때 균일한 이면비드를 얻는 공정을 개발하는 것이다. 따라서 본 연구는 아래보기 자세에서 단차에 따른 용입 특성을 이면비드 및 단면으로 비교 분석하였다. 단차 없이 아크길이만 1mm, 2mm, 3mm로 변경하여 실험한 결과 아크길이가 짧아질수록 표면비드 폭은 좁아졌고 이면비드 폭은 증가하는 경향을 나타내어 아크길이가 짧아질수록 용융효율이 증가하는 것을 확인하였다. 단차 1mm에서 아크길이 3mm를 제외하고 표면비드 및 이면비드가 미려하였다. 하지만 단차 2mm에서는 아크길이 1mm, 2mm, 3mm 전부 이면비드가 생성되지 않았다. 이는 단차로 인해 아크길이가 증가하여 용융효율이 낮아졌기 때문이라 판단된다. 이면비드가 생성되지 못한 시험편을 백 베벨링(0.5mm, 1.0mm, 1.5mm, 2.0mm)하여 실험한 결과 단차 2mm, 아크길이 1-3mm 백 베벨링 2.0mm 적용한 시험편에서 양호한 이면비드를 얻을 수 있었다.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.3
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• pp.39-51
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• 2017

Recently, looking at construction sites with either large or small scale, accidents like collision, fall, etc. occur often. These accidents lead to not only damage of human lives but also serious economic loss. In case of large scale constructions sites, safety management systems are used to reduce industrial accidents. However in construction sites with small scale, those systems cannot be applied due to problems such as lack of compatability and high installation expense. In this case, just by putting on safety gears can also reduce industrial accidents. Therefore, in this paper, a safety management systems that can be used at both large and small scale construction sites is proposed. This safety management system consists of a smart module, a repeater and a gateway, and a monitoring system. The smart module, which is detachable, is attached to a safety helmet. This module transfers the current status of the user to the monitoring system through the repeater and the gateway. The repeater transfers the data received from the smart module to the gateway, and the gateway sends the data from the repeater to the monitoring system. The monitoring system shows the user status to the safety supervisor by displaying the data - temperature, height, intensity of illumination, images - received from the smart module. The safety supervisor can monitor the user status in real-time and take immediate action in case of emergency through this monitoring system.

• The Journal of Bigdata
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• v.5 no.1
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• pp.227-239
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• 2020

This paper introduces a method for predicting the maximum power demand despite communication errors in industrial sites. Due to the recent policy of de-nuclearization in Korea, the price of electricity is inevitable, and the amount of electricity used and maximum load management for the management of power demand are becoming important issues. Accordingly, it is important to predict and manage peak power. However, problems such as loss and modulation of measured power data occur at industrial sites due to noise generated by various facilities and sensors. It is difficult to predict the exact value when measured effective power data are lost. The study presents a model for predicting and correcting anomalies and missing values when measured effective power data are lost. The models used in this study are expected to be useful in predicting peak power demand in the event of communication errors at industrial sites.

• Korean Journal of Construction Engineering and Management
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• v.22 no.1
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• pp.13-26
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• 2021

To promote the off-site construction (OSC) in Korea, technical innovation applied to each phase, such as design, engineering, factory production, and site assembly, is important and equally necessary is the development of management and operation methods that are different from existing construction production methods. However, the current OSC-related studies in Korea are conducted from the technical development viewpoints, such as construction methods. Additionally, few studies have been conducted to derive a management measure for successful OSC projects. Therefore, studies to derive a management measure based on a clear understanding of the core success factors of OSC projects are required. This study aims to analyze several studies related to the success factors of OSC projects conducted overseas and to show its core implications for the successful management of OSC projects in Korea. We expect this study to improve the viability of OSC projects, which will be expanded in Korea in the future.

• Journal of the Regional Association of Architectural Institute of Korea
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• v.21 no.5
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• pp.133-140
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• 2019

Building Information Modeling (BIM) and modular construction are regarded as important technologies that could contribute to overcoming the crisis faced by the construction industry. However, BIM uptake in current modular construction projects is limited. Moreover, there are no specific guidelines to support decision-making regarding the application of BIM in modular construction projects. Therefore, this study aims to analyze the possibility for BIM uptake in each phase of modular construction projects in Korea. Initially, the literature detailing on BIM uptake cases in modular construction projects was reviewed. The detailed work and activities for each phase of a modular project were analyzed via a questionnaire targeting domestic modular experts, to derive items requiring improvement due to errors or changes occurring in the actual project. Ten realistic BIM uptake items were derived, reflecting the results of literature review and expert interviews. Then, the BIM uptake items in each phase were analyzed in terms of necessity and efficiency via a second questionnaire using five-point Likert scales. Finally, the BIM utilization index (BIM UI) of the BIM uptake items was suggested as a priority measure. As a result, the BIM UI of "3D coordination" (U2), "design authoring and reviews for off-site fabrication" (U3), and "detailed 3D modeling for off-site fabrication" (U4), were assigned the highest priority. The results of this study can be used as guidelines to support decision-making regarding the application of BIM in modular construction projects.

• Journal of the Korean housing association
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• v.22 no.5
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• pp.101-110
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• 2011

The Ministry of Land, Transport and Maritime Affairs has announced a policy which can enable the building of urban type housing with the use of a prefabrication method 2010. However, such may possibly be at standstill owing to the prefabrication methodology that has not been currently developed in Korea. Moreover, small households of consisting of one or two family members have been steadily increasing, but the small housing units in which they reside has been decreasing. Due to this situation, urban type housing has been proposed. To expand the propagation of such urban type housing and to promote prefabrication methods, the top priority project is to develop a technology that is able to reduce construction costs, as well as to shorten the actual construction period. In consideration of this prefabrication system for an avenue to solve such problems, a series of systems and policies for the fostering of prefabricated urban type housing has been proposed. This study is to review a series of methods, technologies and policies that are required for such urban type housing and henceforth, to utilize such as preliminary data for further prefabricated urban type housing.