• Journal of the Computational Structural Engineering Institute of Korea
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• v.25 no.1
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• pp.1-8
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• 2012

This study is a basic experimental research to apply FRP (Fiber Reinforced Polymer) box members to slabs and girders among various architectural structures, which receive bending stress. We prepared prefabricated FRP member and connected it to an FRP box member as a large cross section before we conducted an experiment in diverse conditions to analyze characteristics of compressive fracture behavior. In this study, we carried out a compressive fracture behavior test according to fillers on the upper part of the FRP box member, loading methods, and connective types and thereby performed a finite element analysis. The comparison of analysis results with test results revealed that rigidity was found to be slightly low, while stress was concentrated on the fracture point of the sample.

• Broadcasting and Media Magazine
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• v.24 no.1
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• pp.63-72
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• 2019

고령인구의 증대 및 출생 인구의 감소로 과소지와 대중교통 취약지역이 확산되고 있다. 이러한 인구구조의 변화는 교통약자의 독립적 이동이 더욱 불편해지고, 물류의 수송이 어려워 진다. 한편, 도심은 차량의 포화상태로 대기환경의 질이 나빠지고 도심도로는 주차장으로 변질될 뿐만 아니라, 운전자와 보행자 모두에게 안전의 위협이 되고 있다. 이러한 환경과 이동의 효율성을 극대화 하는 방안으로 친환경자동차와 자율주행기술의 접목이 연구개발 중이다. 자율주행기술은 자율주행차와 도로 인프라에 ICT가 융 복합되어 이동과 수송분야의 새로운 산업과 서비스 창출이 가능하다. 본 고에서는 교통약자의 이동과 물류의 수송을 지원하는 자율주행기술의 개발 동향을 살펴본다. 특히 광화문, K-City 등의 도심 자율주행서비스 테스트 경험을 통해 해결해야 하는 복잡한 도심 주행 환경의 인지와 교차로 및 합류로, 비정형 도로환경에서의 주행협상기술의 필요성을 소개한다. 도심의 주행 환경은 고속도로와 같은 자동차 전용도로와 달리, 신호등과 교차로, 2륜 이동체 및 버스 등이 다양하게 혼재된 것으로 인지 및 판단 기능의 고도화가 적극적으로 요구된다. 그리고, 다양한 자율주행서비스 시장을 확산하기 위해 요구되는 이동하는 공간과 시간을 메꿔 줄 미디어 콘텐츠의 역할에 대해 설명하고자 한다.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.109.2-109.2
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• 2010

세라믹 필터는 여러 종류의 분진제거 시스템에서 연소 배가스 정제를 위한 가장 적절한 소재로 알려져 있다. 현재까지 다양한 형태의 세라믹 필터가 개발되고 있는데, 캔들 타입(candle type), 튜브 타입(tubular type), 평판 타입(parallel flow type) 등이 그 예이다. 통상적으로 세라믹 캔들 필터는 가압유동층복합발전(PFBC, Pressurize Fluidized-Bed Combustion), 석탄가스화복합발전(IGCC, Integrated coal Gasification Combined Cycle), 석탄가스화연료전지복합발전(IGFC, Integrated coal Gasification Fuel cell Combined cycle)에서 고온 배가스 정제용으로 사용되고 있다. 일반적으로 IGCC나 CTL 합성가스 정제시스템의 경우에는 높은 고압(약 25기압)과 미세분진이 함유되어 있는 분위기에서 운전된다. 그러므로 이때 사용되는 초청정용 세라믹 집진필터는 고온, 고압 및 부식 환경에서 50 MPa 이상을 갖는 높은 강도와 내식성을 갖도록 개발되어야 하기 때문에 SiC(Silicon Carbide)가 가장 적절한 캔들 필터 소재로 적용되고 있다. 이에 따라 집진용 SiC 세라믹 캔들 필터를 개발하기 위해서는 고온에서 내산화성이 우수하고, 부피팽창에 의한 균열이 발생하지 않는 무기결합재의 선정 및 이를 통한 소재의 특성 최적화가 가장 중요한 부분이라 할 수 있다. 본 연구에서는 IGCC나 CTL 공정에 적용하기 위한 SiC 캔들 필터 소재 개발을 위해 래밍성형 공정으로 1m급의 탄화규소 캔들 필터 시작품을 제작하여 SiC 출발입자 크기와 무기계 결합재인 스트론튬 카보네이트의 첨가량 변화에 따른 필터 소재의 특성 평가를 수행하였다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.30 no.8
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• pp.133-140
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• 2002

In this paper, the structure of integrated navigation computer for experiment is proposed. It is designed for considering the real time processing and data storage capacity. It will be used in missile, aircraft, submarine system and experimental vehicle. The I/O device supports IMU, GPS, odometer, altimeter, depth sensor, inclinometer etc. And the main storage device uses the tape device. That can improve the system stability. Therefore it can be used in a high dynamic or shock environment. The embedded linux is used as an Operating System. For the real time capability, sensor data processing and algorithm processing units are seperated. The time synchronization is referenced by IMU data.

• Journal of Korean Society of Steel Construction
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• v.23 no.3
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• pp.377-384
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• 2011

Recently, for the purpose of reducing work terms and improving performance for construction work, various methods in structure field were developed. This included the HRC system which is applicable to a typical structure (e.g., parking and office building). The HRC system introduced the Gerber Joint to raise structural efficiency and used connection plate to bolt HRC composite beam to H beam in the construction field. In this research, the experimental tests for six specimens, which were in the same field conditions, were conducted with several parameters such as the length and height of the connection plate and the number of stub bolts. The test result was compared with those made by current design codes for the deflection and strains of the main bar. Within the given load, the integration of concrete in beam and connection plate, welded with stud bolts, was verified.

• Journal of the Korean Geotechnical Society
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• v.31 no.4
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• pp.31-43
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• 2015

A numerical analysis on the effect of increasing tensile stiffness of the geosynthetics on the soil displacement and pile efficiency was conducted. Parametric studies by changing the stiffness of soft soil, internal friction and dilatancy angles of the embankment material, and flexual stiffness of the composite layer including the geosynthetics were carried out. In general, increasing stiffness of the geosynthetics improves the pile efficiency, whereas the amount of its improvement depends on the condition of parameters. In case of the sufficiently low stiffness of the soft soil or high flexual stiffness of the composite layer including the geosynthetics, a noticeable increase in the pile efficiency can be observed. When the stiffness of the soft soil is very low, the increase in the stiffness of the geosynthetics can significantly reduce the vertical displacement in the piled embankment. When the flexual stiffness of the composite layer is sufficiently high, increasing stiffness of the geosynthetics can greatly improve the pile efficiency.

• Journal of Digital Convergence
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• v.13 no.10
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• pp.41-50
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• 2015

This study targeted volunteers to identify the variables that affect the attitude for participating in the volunteer activities going forth, and their effect. The independent are consisted of personal characteristic variables, participation related variables, management process variables. As for the dependent variables, they included the will to participate continually and degree of participation. The major findings are as follows : First, volunteer work agency try to activate housewives' participants. Second, the volunteer work agency need to improve and develop the programs which are consisted of more 3-hours per participation and three times per month. Third, so the motivations are the most important variables affect the sustainability, volunteer programs must be established to realize effective experience learning and social participation. Forth, a systematic management for the volunteer programs must be established to activate more participation.

• Archives of design research
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• v.19 no.1 s.63
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• pp.49-58
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• 2006

This study is on the general characteristics of 'Monolithic' architecture. The intentions of monolithic architecture can be assumed as an attempt to replace the formal looseness or difficulties of understanding formal complexity of modern architecture, or a trial to react against contemporary avant-garde architectural tendency typically characterized as unstableness, uncertainty, fluidity, and articulation to reestablish autonomy of architecture. Buildings in this category coincide in their extreme economy and simplicity of overall form and consistency of external appearance while showing great expressional capacity with very limited formal means. Even though monolithic architecture still seems a little unstable and ambiguous in historical aspects, it can be considered as strikingly shaped objects or autonomous forms with identities, logics, and representation that promote recognition. Using architectural techniques of scale, colors, materials and finishes, monolithic architecture shows strategically invested surfaces that mediate between the inside and the outside, and shows unexpected and mysterious autonomy. This kind of monolithic approach is also found in interior space as a separate objects that contain functional space inside, or as formal elements that overflow the boundaries of conventional architecture by eliminating the distinction between floor, wall, and ceiling.

• Journal of radiological science and technology
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• v.40 no.2
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• pp.269-274
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• 2017

In this research, we simulated the elementary star shielding ability using Monte Carlo simulation to apply medical radiation shielding sheet which can replace existing lead. In the selection of elements, mainly elements and metal elements having a large atomic number, which are known to have high shielding performance, recently, various composite materials have improved shielding performance, so that weight reduction, processability, In consideration of activity etc., 21 elements were selected. The simulation tools were utilized Monte Carlo method. As a result of simulating the shielding performance by each element, it was estimated that the shielding ratio is the highest at 98.82% and 98.44% for tungsten and gold.

• Journal of the Korean Ceramic Society
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• v.34 no.1
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• pp.45-55
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• 1997

Various kinds of amorphous silicates were used as raw materials to synthesize building materials based on calcium silicate hydrates. Relationships between the reactivities of silicates and castabilities of the building materials were investigated. In addition, effects of the reactivities of silicates on the mechanical properties of casted specimens were studied by analyzing microstructures and hydrates produced. As the reactivity of silicate increase, the press castability increases and the crystal size of hydrate and pore size also increase. For the mechanical properties, the flexural strength increases with decreasing crystal size and densifing microstructure. The compressive strength is greatly dependent on the den-sification of microstructure rather than crystal size of hydrate. Based on the results, diatomous ma-terials are desirable due to high reactivity and formation of densified microstructure. Slag and fly ash may be partially used as raw materials with amorphous silicates to manufacture building materials based on calcium silicate hydrates.