• 국제초고층학회논문집
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• 제12권4호
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• pp.343-350
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• 2023

With the advent of the recent Fourth Industrial Revolution, efforts are vigorously underway to comprehend the new paradigm of Construction 4.0, following in the footsteps of Industry 4.0, and to establish novel production systems. The necessity and significance of technological advancements in the field of construction automation and robotics, a pivotal component for Construction 4.0, are being emphasized. This paper aims to discuss the concept of construction automation and robotics, encompassing its past, present, and future prospects. Particularly, it reviews the six relevant papers featured in the June 2022 special issue of IJHRB, along with discussions on the integration of cutting-edge ICT technologies and R&D in the realm of automation and robotics. With the progression of ICT technology, the domain of construction automation and robotics is anticipated to play a substantial role in the realization of Construction 4.0 and smart construction through more dynamic convergence in technological development.

• 한국지리정보학회지
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• 제5권3호
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• pp.77-86
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• 2002

최근 지리정보시스템은 국가단위의 대규모 응용 애플리케이션 개발 뿐만 아니라 시설물관리시스템과 같은 소규모 시스템에 이르기까지 그 규모가 다양하다. 또한 그 활용 분야도 경영정보시스템에서부터 카네비게이션시스템에 이르기까지 우리의 일상 생활에 다양한 모습으로 다가오고 있다. 이런 시점에서 짧은 시간 내에 효과적이고 유용하게 지리정보시스템을 개발하기 위해서는 GIS 컴포넌트의 개발방법론 뿐만 아니라, 이미 개발되어 사용되어지고 있는 GIS 컴포넌트의 관리측면에 대한 고려가 매우 절실한 실정이다. 현재 많은 GIS 컴포넌트가 그 상호운용성 및 질적면에서 탁월한 결과를 가지고 있지만, 저장소 내에서 검색의 비효율성으로 인해 재사용성의 많은 문제점을 가지고 있다. 본 논문에서는 각 GIS 컴포넌트가 저장소 내에 위치하기 전에 이들의 기능적 및 비기능적 요소를 반영하여 컴포넌트를 분류하고자 하였다. 특히 비기능적 요소를 정의함에 있어서 컴포넌트의 메타데이터를 이용하여 'GIS content-dependent metadata'와 'GIS content-independent metadata'를 식별하였다. 그리고 이들 정보를 바탕으로 웹기반 GIS 컴포넌트의 등록 및 검색시스템을 설계하였다. 향후 GIS 애플리케이션 개발자는 웹기반 GIS 컴포넌트 저장소 내에 등록된 컴포넌트와 그 정보를 바탕으로 자신의 목적에 부합하는 새로운 컴포넌트를 쉽게 재구성하고 수정할 수 있으리라 사료된다. 결국 GIS 컴포넌트의 재사용성과 상호운용성을 높여 새로운 지리정보시스템 개발에 소요되는 인력 및 시간, 예산 절감의 효과를 얻을 수 있을 것으로 기대된다.

• Structural Engineering and Mechanics
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• 제14권5호
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• pp.595-610
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• 2002

This paper presents an efficiency of various non-conforming (NC) modes in development of a series of new finite elements with the special emphasis on 4-node quadrilateral elements. The NC modes have been used as a key scheme to improve the behaviors of various types of new finite elements, i.e., Mindlin plate bending elements, membrane elements with drilling degrees of freedom, flat shell elements. The NC modes are classified into three groups according to the 'correction constants' of 'Direct Modification Method'. The first group is 'basic NC modes', which have been widely used by a number of researchers in the finite element communities. The basic NC modes are effective to improve the behaviors of regular shaped elements. The second group is 'hierarchical NC modes' which improve the behaviors of distorted elements effectively. The last group is 'higher order NC modes' which improve the behaviors of plate-bending elements. When the basic NC modes are combined with hierarchical or higher order NC modes, the elements become insensitive to mesh distortions. When the membrane component of a flat shell has 'hierarchical NC modes', the membrane locking can be suppressed. A number of numerical tests are carried out to show the positive effect of aforementioned various NC modes incorporated into various types of finite elements.

• 한국수소및신에너지학회논문집
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• 제25권6호
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• pp.586-593
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• 2014

Limited sources of fossil fuels and also global climate changes caused by $CO_2$ emissions are currently discussed around the world. As a renewable, carbon neutral and widely available energy source, biogas is regarded as a promising alternative to fossil fuels. In this study, a plasma dump reformer was proposed to produce $H_2$-rich synthesis gas by a model biogas. The three-phase gliding arc plasma and dump combustor were combined. Screening studies were carried out with the parameter of a dump injector flow rate, water feeding flow rate, air ratio, biogas component ratio and input power. As the results, methane conversion rate, carbon dioxide conversion rate, hydrogen selectivity, carbon monoxide yield at the optimum conditions were achieved to 98%, 69%, 42%, 24.7%, respectively.

• 신재생에너지
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• 제7권3호
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• pp.92-100
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• 2011

With the increased demand of clean energy and global warming measures, the renewable energy development has been increased recently. The TCP (Tidal Current Power) is one of the ocean renewable energy sources. Having the high tidal energy source in Korea, there are many potential TCP sites with strong current speed. The rotor, which initially converts the energy, is a very important component because it affects the efficiency of the entire system. The rotor performance is determined by various design parameters including number of blades, shape, sectional size, diameters and etc. However, the interactions between devices also contribute significantly to the energy production. The rotor performance considering the interaction needs to be investigated to predict the exact power in the farm. This paper introduces the optimum design of TCP turbine and the performance of devices considering the interference between rotors.

• 비파괴검사학회지
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• 제21권2호
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• pp.177-181
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• 2001

광학적 비접촉 비파괴검사 방법인 ESPI, Shearography를 이용한 측정은 자동차나 항공기산업 등에서 최근 폭넓게 이용되고 있다. 빠른 측정 속도와 측정 대상의 전 영역을 한번에 측정할 수 있는 장점을 가진 Shearography를 이용한 비파괴검사 방법을 기존의 광계측법인 ESPI와 비교하였다. 또한 이러한 장점을 살려 산업현장에서 수행한 여러 가지 비파괴검사 사례를 제시하였다.

• 기술사
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• 제32권1호
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• pp.122-141
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• 1999

Groupware is a new emerging research field, involving increasing numbers of institutions in the USA, Europe, and Asia such as Korea and Japan, etc., as an interdisciplinary research and development area with a strong computer science component. It grew from fairly unsystematic attempts by various developers to generate software that would increase the competence of people working together. This in turn was partly a response to: failures of and problems inherited from Office Automation and Management Information System ; some sociological intuitions about ways people might work together; and a search for uses of new interfacing, networking, and multi-media technologies. In this paper, groupware that has been configured to meet the needs of groups at work is defined as computer-based systems which support working groups of people engaged in common task in a shared environment. The basic concepts, origin, and historic research of the groupware are described. Specially, groupware relies on the approaches and contributions of many disciplines in computer science as well as sociology that is concerning human, social, and cultural activities. So, nine key disciplines of them upon which successful groupware depends are described briefly. Some state-of-the-art implementations and developments are reviewed through classifying and analyzing the current available groupware applications in the field or market.

• 한국신뢰성학회지:신뢰성응용연구
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• 제18권3호
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• pp.213-219
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• 2018

Purpose: Satisfying the environmental regulations, the automobile manufacturer should install urea tank, which is a key component of the urea system. However, due to the limitations of existing layouts, it may be mounted which is disadvantageous to vibration and shock resulting in durability robust. analyze the factors affecting the durability life of urea tank and the vibration characteristics through RLDA. In this study, clarify the limit of the current practice test method of urea tank and analyze the possibility of the new vibration test method in the system unit reflecting the characteristics of actual use condition. Methods: Analyzing the factors affecting the durability life of urea tank and the vibration characteristics through PSD & FDS of RLDA that actual vehicle driving data on durability test road. Results: The limit of the uniform width/single frequency test method of urea tank is clarifed and the positive prospects of the new test method are discovered. Conclusion: The vibration durability test with PSD method in system unit effectively reflects the magnitude and frequency characteristics of field vibration.

• Earthquakes and Structures
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• 제12권5호
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• pp.543-557
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• 2017

Results of an extensive study aiming to properly extend the well known pushover analysis into 3-D problems of asymmetric buildings are presented in this paper. The proposed procedure uses simple, 3 DOF, one-story models with shear-beam type elements in order to quantify the effects of inelastic torsional response of such buildings. Correction coefficients for the response quantities at the "stiff" and "flexible" sides are calculated using results from non-linear time history analyses of the simple models. Their values are then applied to the results of a simple, plane pushover analysis of the detailed building models. Results from the application of the new method for a set of three, conventionally designed, five-story buildings with high values of uniaxial eccentricities are compared with those obtained from multiple non-linear dynamic time history analyses, as well as from similar pushover methods addressing the same problem. This initial evaluation indicates that the proposed procedure is a clear improvement over the simple (conventional) pushover method and, in most cases, more accurate and reliable than the other methods considered. The accuracy, however, of all these methods is reduced substantially when they are applied to torsionally flexible buildings. Thus, for such challenging problems, use of inelastic dynamic analyses for a set of two component earthquake motions appears to be the preferable solution.

• 농촌계획
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• 제1권1호
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• pp.65-74
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• 1995

As a initial methodological approach to rational land use planning in the county-level area, three types of land suitability classification techniques were examined from the viewpoint of their practical applicability through the case study of Seungju-gun area, Chonnam-province, Korea : major factors' criteria(method I ), principal component analysis( I ), and local monitoring( R( ). Each method has its strong and weak points as shown in Tab.-5. Therefore, when its practical application, there seem to be wide-range methodological selectivities from exclusive use of the best one to intermethodological combination of related ones In the beginning stage, intermethodological combination of all three types were tried to formulate the best solution possible. However, because of reliability problem of method R accrued from non- uniformity of evaluators'quality, only two methods( 1 , E ) were combined into a new evaluation method The applied results of the new combined method to case study area are shown in Fig.-2, 3 and 4.