• Transactions of the Korean Society of Mechanical Engineers A
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• v.32 no.3
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• pp.223-231
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• 2008

This paper introduces a robot called the MRINSPECT V (Multifunctional Robotic crawler for Inpipe in-SPECTion V) for the inspection of pipelines with a nominal 8-in inside diameter. Based on the mechanism of the previous model MRINSPECT IV, we developed a new MRINSPECT V by using the differential driving mechanism, so that just simply controlling the speed of each driving units helps the robot to travel effectively inside the pipelines. Furthermore, the robot uses clutches in transmitting driving power to wheels. This clutch mechanism enables MRINSPECT V to select the suitable driving method according to the shape of pipeline. In this paper, the critical points in design and construction of the proposed robot are described with the preliminary results to provide good mobility and increase the efficiency.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1994.10a
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• pp.80-85
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• 1994

전 세계적으로 환경에 대한 관심이 고조됨에 따라 육상 교통 기관, 건설 장비, 심지어 가전 제품에 있어서도 소음 문제에 대한 관심이 크게 대두되고 있다. 특히, 수출을 하기 위해서는 그 나라의 소음 규제법을 만족시켜야 하며 제품의 경쟁력을 위해서는 그 이상의 것이 요구되고 있다. 또한, 소음 문제는 소비자의 제품 구매 선택에 영향을 주기도 한다. 일본의 경우 JIS 규격으로 건설 장비의 소음을 규제하고 있으며, 소음 수준에 따라 일반 장비, 저 소음 장비, 초 저소음 장비로 구분하여 장비에 따라 건설 작업을 제하하기도 하며, 특히 초 저소음 장비 인증을 받은 것은 장비 사용 단가 및 사용에 있어 차등을 두어 혜택을 주고 있다. 본 논문에서는 현재 크롤러 굴삭기에 대해 시행중인 유럽 소음 규제법 86/662/EEC 보다 강화되어 '97년부터 적용 예상되고 있는 89/514/EEC 소음 규제에 대비하여 크롤러 굴삭기의 소음 저감 대책을 논하고자 한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.06a
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• pp.385-386
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• 2013

최근 인터넷이나 스마트 홈 기기의 발달로 웹의 크기가 폭발적으로 증가함에 따라 인터넷상에 존재하는 웹 문서들을 추적하여 필요한 정보를 수집하는 기술이 중요성을 더해 가고 있다. 스마트 홈 클라우드 서비스는 스마트 홈과 클라우드가 융합된 기술로 개인과 가정에서 생성되고 소비되는 컴퓨팅 자원과 콘텐츠들을 외부 서버 또는 다른 가정과 필요할 때 결합하고 공유하는 서비스로, 더욱 만족스러운 서비스를 위해서는 사용자의 컨텍스트를 자동으로 수집, 처리, 가공해 주는 기능이 필요하다. 이에 본 논문에서는 사용자가 좀 더 편리하고 만족스럽게 가정내의 스마트 홈 기기를 사용할 수 있도록 사용자나 스마트 기기의 콘텍스트에 맞는 정보를 제공할 수 있는 클라우드 기반의 콘텍스트 크롤러를 연구 및 설계하였다

• Journal of the Korean Professional Engineers Association
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• v.23 no.6
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• pp.41-46
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• 1990

First of all, Under given condition such as bit gage of 36mm Drill bit with right class of jack-logs experimental test carried out from two face of Bench, firing of each hole brought 90 degree Angle face and them measured length of Burden and charged ammount of powder as following. (equation omitted) A=Activated Area A=ndi=m S=Peripheral length of Charged. room Ca=Rock Coeffiecency d : di=Hole diameter When constructed subway of Seoul in 1980 the blasting works increased complaint of ground vibration. in order to prevent the damage to structures. Some empirical equations were made as follows on condition with Jackleg Drill (Bit Gage ø 36mm) and within 30 meter distance between blasting site and structures. V=K(D / W)$\^$-n/ N=1.60-1.78 K=48-138 Project one of contineous works to above a determination of empirical equation on the cautious blasting vibration with Crawler Drill(ø 70-75mm) in long distance. V=41(equation omitted) V=124(equation omitted).

• Knowledge Management Research
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• v.19 no.2
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• pp.133-150
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• 2018

To cope with the rapid changes in the corporate environment, the creation of innovative output through various forms of collaboration have been discussed. For open collaborations, contributors who distribute to various countries and cultures are able to share knowledge via the internet without physical rewards or responsibilities. In this study, we focused on the open source software project, which is a representative open collaboration. We investigated the factors that affect the knowledge contribution of developers of various countries within the open collaboration platform. Specifically, we investigated the open collaborative nature of multi-culture developers by dividing cultures according to collectivism and individualism. We collected data on 26,604 developers using a python based web crawler for GitHub which is an open source software development platform, and conducted cross-cultural study. This paper contributes to the field of knowledge management by suggesting various impacts of antecedents such as hireability, and information exposure on knowledge sharing according to culture.

• Journal of the Korea Computer Industry Society
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• v.4 no.12
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• pp.1093-1102
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• 2003

The dynamic nature of the World Wide Web challenges Search engines to find relevant and recent pages. Obtaining important pages rapidly can be very useful when a crawler cannot visit the entire Web in a reasonable amount of time. In this paper we study way spiders that should visit the URLs in order to obtain more “important” pages first. We define and apply several metrics, ranking formula for improving crawling results. The comparison between our result and Breadth-first Search (BFS) method shows the efficiency of our experiment system.

• 제어로봇시스템학회:학술대회논문집
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• 2002.10a
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• pp.105.4-105
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• 2002

The development of a teleoperated mobile robot, Kaerot/m2, has been described. Kaerot/m2 consists of three subsystems - a 4 wheeled mechanism with the dual reconfigurable crawler arms, a thermal image monitoring system , and an extendable long reach mast. The mechanical design, control system of Kaerot/m2 in terms of remote inspection operation at a high radiation level of the Calandria face environment has been shown. Kaerot/m2 is capable of detecting the degraded locations of the Calandria face in a remote manner.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.14 no.5
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• pp.2204-2220
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• 2020

In recent years, digital content has become easily accessible because of internet technology. Representative examples of such digital content include various types, such as music, TV, (program, sport, drama etc.) and films. However, there are cases where internet technology is used in illegal ways without the authorization of the copyright holder for digital content. Such actions have a direct impact on copyright owners' profits and further affect the development of the digital culture industry adversely. Therefore, in this study, we analyze features to detect piracy sites that cause copyright infringement. Further, we develop a piracy site detection crawler based on these features and present the analysis of its performance.

• Journal of Institute of Control, Robotics and Systems
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• v.19 no.11
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• pp.1043-1047
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• 2013

Smart mobile robot is a kind of Intelligent Robot. It means that operates manipulate autonomously and recognize the external environment. Smart mobile robot moving mechanism has many type and the type depend on the robot shape or purpose. Recently, research on the moving mechanism has been actively in many area. The moving mechanism divided to wheel type, crawler type, walking type, other type and the moving type choose by the kind of robot or the purpose robot. In this paper, describe the kind of moving mechanism on the smart mobile robot and the technical trend of moving mechanism of smart mobile robot.

• Proceedings of the IEEK Conference
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• 2002.06e
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• pp.193-196
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• 2002

In this paper, we presents the remote inspection activity with a mobile robot at the calandria face areas of the PHWR (pressurized heavy water reactor) nuclear power plants during full power plant operation.. The tele-operated mobile robot has been developed for this task. A 4 wheeled mechanism with the dual reconfigurable crawler arm has been adopted for the ease access to the high radiation area of calandria face. A specially designed extendable long reach mast attached on the mobile platform and the thermal image monitoring system enable human eyes to look into the calandria face. Application of robot will keep human workers from high radiation exposure and enhance the reliability of nuclear power plants.