• Geomechanics and Engineering
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• 제17권1호
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• pp.81-95
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• 2019

Due to the importance of soil reinforcement using geotextiles in geotechnical engineering, study and investigation into long-term performance, design life and survivability of geotextiles, especially due to installation damage are necessary and will affect their economy. During installation, spreading and compaction of backfill materials, geotextiles may encounter severe stresses which can be higher than they will experience in-service. This paper aims to investigate the installation damage of geotextiles, in order to obtain a good approach to the estimation of the material's strength reduction factor. A series of full-scale tests were conducted to simulate the installation process. The study includes four deliberately poorly-graded backfill materials, two kinds of subgrades with different CBR values, three nonwoven needle-punched geotextiles of classes 1, 2 and 3 (according to AASHTO M288-08) and two different relative densities for the backfill materials. Also, to determine how well or how poorly the geotextiles tolerated the imposed construction stresses, grab tensile tests and visual inspections were carried out on geotextile specimens (before and after installation). Visual inspections of the geotextiles revealed sedimentation of fine-grained particles in all specimens and local stretching of geotextiles by larger soil particles which exerted some damage. A regression model is proposed to reliably predict the installation damage reduction factor. The results, obtained by grab tensile tests and via the proposed models, indicated that the strength reduction factor due to installation damage was reduced as the median grain size and relative density of the backfill decreases, stress transferred to the geotextiles' level decreases and as the as-received grab tensile strength of geotextile and the subgrades' CBR value increase.

• 수산해양교육연구
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• 제25권3호
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• pp.733-742
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• 2013

The Korea has significant tidal current energy resources, but it is so hard to work underwater for tidal turbine installation. Therefore commercial diving work is very important for tidal current generator. Also, Jangjuk channel is vary famous as proper area to generate tidal current energy. Nevertheless, no one is studied about characteristics of commercial diving works with installation of tidal current generator. The purpose of this study is to introduce commercial diving with work types and investigate critical limits of diving working under the conditions, which are working only to minutes at slack tide during the neap tide. As the results, work types are five as like mooring installation, OMAS(Offshore Maintenance Access System), support structure installation, cable and turbine installation. Here, the original construction period is expected about 4 months, but the construction take 18 months to complete. The cause of extends construction period is insufficiency of researching tidal current conditions at the site and ignorance of slack tide which need to secure diving working time. Total diving working times are 110th during 18 months, the highest percentage of diving times is turbine installation about 43.6 %, and cable, mooring installation and support structure construction are 27.3 %, 15.5 %, 13.6 %, respectively. On the basis of this study, estimation of times of commercial diving is possible with work types of tidal current power, and has a significance as basic data to determining construction period.

• 정보처리학회논문지A
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• 제10A권6호
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• pp.685-690
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• 2003

새로운 무선인터넷 디바이스로써 주목받고 있는 PDA는 기능 개선을 위해서 다양한 애플리케이션 개발이 이루어지고 있으며 수시로 응용프로그램이 설치되어지고 있다. 또한 PDA는 전원이 방전 될 경우에 RAM(Random Access Memory)에 저장되어 있는 데이터가 모두 삭제되는 단점이 있어서 그때마다 프로그램을 다시 복원해야 한다. 본 논문에서는 PDA의 응용 프로그램을 설치할 경우에 사용자가 직접 애플리케이션을 설치해야 하는 기존의 문제점을 해결하기 위하여 자동으로 PDA 응용프로그램이 설치되는 시스템(PAIS : PDA Automatic Installation System)을 제안하였다. 이 시스템을 적용한 경우 사용자에게는 설치에 소요되는 시간과 노력을 감소시켜 편의를 제공하고, 기업에게는 프로그램 설치관련 홍보물 제작에 소요되던 비용을 절감 할 수 있는 효과가 있다.

• 한국실내디자인학회논문집
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• 제23권5호
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• pp.41-50
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• 2014

In relation to spatial expression, the remediation theory of Jay David Bolter & Richard Grusin shows a sufficient possibility of providing extended idea and experience through the space of critical representation. The remediation theory discussed in the scope of new media says about the existence method and the development process of media through immersion into media and awakening, and one attribute of remediation which aims at the extension of another realistic experience and recognition through various media, contains common denominators which display diversity and complexity of installation space, and use the audience as expression elements. Therefore, this study aims to apply the remediation theory in order to interpret space using more diverse and multisensory expression methods. For achieving this purpose, this study found the connection among characteristics of hypermediacy which is an axis of installation and remediation theory, and analyzed diverse cases regarding installation space and characteristics of hypermediacy, depending on external aspects of form and expression and internal aspects of experience and cognition. The method of hypermediation expression in installation space converts the recognition about the basic custom of new experience, space and representation. This means that the logic of remediation could approach space by leading to more extended form and recognition. In conclusion, the characteristics of space and the possibility of extended expression revealed in the relationship between installation space and hypermediacy logic would provide another developmental significance for research on space design.

• 조명전기설비학회논문지
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• 제24권6호
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• pp.115-122
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• 2010

중앙전력감시시스템은 공장 부하 설비 상황을 감시반에서 감시 및 신속한 제어를 수행함으로써 공장 부하 설비의 관리와 운영의 효율화를 극대화 하는 것이다. 이러한 시스템의 주된 특징은 공장 부하 설비의 운전상태 계측, Data 처리, PLC(Power Line Communication), 조명 제어 등의 감시 제어, 전력운용에 필요한 프로그램을 내장하여 효율적으로 계통을 관리하는 것이다. 본 연구에서는 능동데이터베이스를 이용하여 중앙전력감시시스템을 구현하는 방안을 제시함으로써, 공장 부하의 사고 징후를 사전에 파악하고, 사고 발생 시 이에 대한 대처를 데이터베이스 스스로 수행하도록 함으로써 인위에 의한 실수를 최소화 할 수 있도록 했으며, 그리고 제시된 시스템을 서로 다른 특징을 갖는 5개의 부하로 이루어진 공장 부하에 적용하여 그 유용성을 입증하였다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 춘계 학술논문 발표대회
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• pp.121-122
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• 2015

The demand on free-form buildings is gradually increasing, but there are several problems such as increased cost and construction duration, and decreased constructability at the construction phase upon construction of a building owing to the difficulty of member production-installation. To solve these problems, a technology to produce FCP using a CNC machine was developed. Basically, it delivers the information on a free-form building designed to the CNC machine, the shapes of RTM and PCM are created using the information delivered and FCP are produced with the RTM and PCM which act as forms. Since the construction duration and project cost are limited on site, the efficiency of FCP production-installation is significant for application of the technology. For it is almost impossible to change the production-installation layout and process once they are set in the construction phase, they should be carefully determined. Before the production-installation layout are established, it is necessary to analyze the factors that influence the duration. Thus, the study intends to analyze influence factors in PCM mold on estimation of the production-installation duration for FCP. According to the analysis of influence factors, a simulation model for estimation of the duration that changes depending on the constraint conditions can be built.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2007년도 추계학술대회 논문집
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• pp.199-201
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• 2007

This paper presents the installation of measuring system for the transient behaviors of grounding system impedances using portable impulse current generator. The measuring system is controller, with controller, power supply, impulse current generator and data aquisition system. In the evaluation of the impulse response in a ground electrode, the step response is calculated based on the ratio of the voltage and current observed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.859-862
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• 1988

This paper discusses one overall reactive power installation pattern that will satisfy system performance constraints for base case. The cost of installation is minimized, Existing controllers are fully utilized prior to any addition of new installation. Installation pattern for the required new shunt compensation is comprised of discrete, standard size components.

• 항공우주시스템공학회지
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• 제1권4호
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• pp.1-6
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• 2007

The interest about the installation and certification for miscellaneous non-required electrical equipment is being increased in the domestic aviation industries. In this paper, the minimum applicable requirements in Airworthiness Standard and the acceptable means of compliance which can be applied to installation and certification for miscellaneous non-required electrical equipment is being researched. As a case study, galley certification procedures are presented by electrical load analysis, installation of warning devices and installation requirements.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2004년도 춘계학술대회 논문집
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• pp.321-325
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• 2004

Electrical facilities of entertainment spaces become more complicate and bigger due to growing industry and economy. Therefore using only Technical standards for Electrical facilities of internal standard, we have some difficulty for management and installation of electrical facilities of entertainment spaces. So this paper gives a information which is applied to install the electrical facilities of entertainment space by analysing and comparing of internal and external standard.