• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 추계 학술논문 발표대회
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• pp.177-178
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• 2015

Various vibration caused by construction vehicles and equipment movement, rock blasting, and crushing obstacle occurs inevitably in construction sites. In this study, we measured the impact of vibration by blasting rock at construction sites, rock crushing, concrete crushing. The measuring instrument was installed in adjacent buildings and observed that blasting vibration differs depending on the charge weight, blasting distance, and the measuring position. The observation was maintained by allowable peak particle velocity standard according to each standards and references.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.453-455
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• 2004

The quality of agricultural products is represented a degree of freshness and a special quality related to a commercial value. To grade cucumber, the charge-coupled device(CCD) camera is only used to measure external qualities like color. size and degree of bended cucumber The processed area of the image replaces the weigh of cucumber. That means there is no longer used the weighing beams. The system consists of Image processing system and distributing system. This paper explains the structure and movement of the automatic grade system and applies the algorithm for deformed cucumber and characteristics of cucumber through image processing to the grade system.

• 한국주거학회:학술대회논문집
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• 한국주거학회 1994년도 학술발표대회논문집 상
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• pp.65-73
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• 1994

With the recent rise of apartment houses, the Korean government set up the Apartment House Manager System in 1989. In fact. a similar was originally introduced and fully settled down in England where the apartment house have been developed for a while. This study is primarily concerned with the comparison of apartment house manager system between Korea and England, with special respect to the background, the department in charge, the qualification of examinees, and the subjects for examination. The first part of this study deals with the difference of system between Korea and England. Among the most salient difference is that the system of Korea was established by the gorvernment itself in order to solve some problems derived from management, whereas that in England came into being for citizens to help the poor with housing problems as a Chrisitian social movement. The second part of this study suggests that it is necessary to open a department of apartment house at the two-year colleges. In addition, it would be advisable to give some advantages such as full a partial exception from examination to those who graduate from four-year universities or colleges.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1642-1644
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• 1996

Passivation must prevent ionic charge movement on the surface of the junction, thereby minimizing the junction leakage and maximizing the breakdown voltage of the devices. Borosilicate glasses are widely used as surface passivants for such silicon power devices as thyristors, transistor, and diodes. Since these 91asses are electrically stable at high temperatures and in high electric fields, they can readily be applied as a thick film, and they are resistant to humidity and have low ionic mobility. A deposition technique of glass film on the silicon surface by electrophoresis in which acetone is used as a suspension medium has been investigated. The purpose of this paper is to describe electrophoretic deposition method for glass passivation and characteristics of glass films which were compared using DTA, SEM, XRD, as a function of firing temperature.

• 반도체디스플레이기술학회지
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• 제20권1호
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• pp.54-58
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• 2021

The RGO with controllable oxygen functional groups is a novel material as the active layer of resistive switching memory through a reduction process. We designed a nanoscale conductive channel induced by local oxygen ion diffusion in an Au / RGO+GQD / Al resistive switching memory structure. A strong electric field was locally generated around the Al metal channel generated in BIL, and the local formation of a direct conductive low-dimensional channel in the complex RGO graphene quantum dot region was confirmed. The resistive memory design of the complex RGO graphene quantum dot structure can be applied as an effective structure for charge transport, and it has been shown that the resistive switching mechanism based on the movement of oxygen and metal ions is a fundamental alternative to understanding and application of next-generation intelligent semiconductor systems.

• 국제학술발표논문집
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• The 7th International Conference on Construction Engineering and Project Management Summit Forum on Sustainable Construction and Management
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• pp.167-175
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• 2017

Building Information Modeling (BIM) comes to be implemented into architectural design, construction, and maintenance in Japan in order to convert design information thoughout a construction project. However, various problems are taking place in data transaction. It is not also clear about the role and the responsibility of the architects and the enginners in charge.There is a movement to establish a BIM manager as a general coordinator concerning BIM in Singapore and other countries, though it is not yet popular in Japan. This paper deals a BIM manager as a new profession in a construction project. The function and skills necessary to a BIM manager is analyzed, and the strategy of Japanese general contractors is discussed. General contractors from Japan are operating BIM in Singapore compatible with open system of supply chain. This style is different from the one in Japan even they belong to the same company. In this paper it is analyzed based on the survey in detail.

• 화약ㆍ발파
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• 제30권2호
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• pp.29-42
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• 2012

발파 시 자유면의 이동은 대상암반의 역학적 특성 및 발파조건, 특히 암반의 불연속면 특성과 폭약의 종류, 장약량, 저항선, 공간격, 공간 또는 열간 기폭시차 및 전색상태 등 여러 가지 변수들에 의해 달라지며, 이는 발파진동의 크기, 폭음 및 파쇄도에 커다란 영향을 미친다. 현재 국내 노천발파 현장의 발파설계는 대부분 인접 보안물건에 대한 안전성을 최우선으로 하고 있으나 대규모 발파가 이루어지는 노천현장에서는 발파 시 자유면의 이동을 분석하여 진동을 제어하고 파쇄도를 향상시키기 위한 최적 조건의 발파 설계를 하는 것은 매우 중요하다. 고속 디지털 동영상 분석을 통하여 발파 후 최초 자유면 암반의 움직임, 전색의 적정성, 발파암의 이동 궤적, 발파암의 이동방향과 속도, 최적의 기폭시스템 분석이 가능하다. 외국에서는 이와 같은 방법이 발파설계 및 평가를 위한 유용한 도구로 활용되고 있으나 국내에서는 그 연구가 미미하다. 따라서 본 연구는 디지털 고속 동영상 분석에 의한 최적 발파설계 및 평가에 대한 기초적인 연구를 수행하였다. 셰일과 화강암으로 구성된 대규모 노천 발파현장 2개소에서 Emulsion과 ANFO 두 종류 폭약에 대한 암반 파쇄과정을 촬영한 디지털 고속동영상을 분석하여 자유면 암반의 변위, 이동속도 등을 분석하고 2차원 유한요소 해석 프로그램인 AUTODYN을 사용하여 폭약의 폭굉압력, 폭굉 전달시간, 발파 후 최초로 암반에 변위가 발생되는 반응시간, 발파 후 자유면 암반의 이동형상에 대한 수치해석을 수행하였다. 수치해석 및 디지털 고속 동영상을 분석한 결과, 암반의 종류에 관계없이 발파공 전면 자유면 암반의 이동형상은 주상 장약부의 중간 부근에서 변위 및 이동속도가 가장 크게 발생되어 가운데 부분이 활처럼 휘어진 형상을 나타내었다. 폭약의 폭굉압력, 폭굉 전달시간, 발파 후 최초로 자유면 암반에 변위가 발생되는 반응시간의 경우 Emulsion 폭약이 ANFO보다 폭굉압력 및 폭속이 크고 초기 변위 반응시간이 빠르게 진행되는 것으로 분석되었다.

• 한국과 국제사회
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• 제1권2호
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• pp.5-32
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• 2017

5.18 광주 민중항쟁은 1993년 5월 김영삼 대통령에 의해 합법적인 민주화운동으로 인정받았고, 2011년 유네스코는 '5.18 광주민주항쟁'을 세계기록 유산으로 승인하였다. 이는 광주시민의 명예 회복에 전기를 마련하는 일이었다. 하지만 사건 발생 37년이 지난 지금도 이에 대한 평가는 전국적으로 통일되지 않았고, 어쩌면 광주만의 정신, 광주만의 자부심으로 기억되고 있는지 모르겠다. 이러한 상황이 지속되는 여러 요인들이 있겠지만, 본 연구자는 5.18의 진상규명과 시대정신에 맞는 재해석, 시민교육을 담당할 전문가들이 전라도와 서울에 집중적으로 분포되어 있다는 점이 가장 큰 요인으로 작용하고 있다고 생각한다. 게다가 5.18을 달리 평가하는 저널이 가해자 지역에 적을 두고 활동하고 있어 평가가 양분 된 채 통일되지 못하고 호남에 갇혀있게 된 것이라 생각한다. 본 연구는 5.18의 의미가 전국적으로 통일되지 못하고 호남에 갇혀있게 된 요인으로 5.18관련자들만의 "당사자주의"의 한계에 있다 판단하고 있다. 특히 이 사건을 객관적인 시각으로 분석하고 해명해야 할 연구자들이 연고지역에 편중분포(광주 전라도>서울>경남)되어 있어 5.18의 의미가 통일되지 못하고 있는 것이 아닌지 그 개연성에 주목하게 되었다. 이 연구에서는 학술연구논문과 저널 저자 및 출판 소재지가 양분되어 있고, 편중분포 되어 있음을 밝히고, 연구자들의 편중분포가 지역성 극복에 걸림돌이 되고 있다는 개연성을 밝히고자 한다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집D
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• pp.97-103
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• 2001

The effects of the electrohydrodynamic (EHD) flow and turbulent diffusion on the collection efficiency of a model ESP composed of the plates with a cavity were studied through numerical computation. The electric field and ion space charge density were calculated by the Poisson equation of the electrical potential and the current continuity equation. The EHD flow field was solved by the continuity and momentum equations of the gas phase including the electrical body force induced by the movement of ions under the electric field. The RNG $k-{\varepsilon}$ model was used to analyze the turbulent flow. The particle concentration distribution was calculated from the convective diffusion equation of the particle phase. As the ion space charge increased, the particulate collection efficiency increased because the electrical potential increased over the entire domain in the ESP. The collection efficiency decreased and then increased, i.e. had a minimum value, as the EHD circulating flow became stronger when the electrical migration velocity of the charged particle was low. However, the collection efficiency decreased with the stronger EHD flow when the electrical migration of the particle was higher relatively. The collection efficiency of the model ESP increased as the turbulent diffusivity of the particle increased when the electrical migration velocity of the particle was low. However, the collection efficiency decreased for increasing the turbulent diffusivity when the electrical migration of the particle was higher relatively.

• International Journal of Aeronautical and Space Sciences
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• 제12권2호
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• pp.175-178
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• 2011

An optical fiber-based beam width measurement technique is presented. The proposed system can be applied to the optical fiber industry in applications such as lensed fiber, optical fiber based laser beam source, and fiber optic sensor. The measurement system is composed of optical fiber, which is used as a transceiver, and a single grating panel which consists of a multi-reflection area with an even non-reflection area. The grating panel is used to vary the reflected light. When the widths of the reflection area and non-reflection area are larger than the optical beam width, the reflected light is varied at the interface between the reflection area and the non-reflection area by the movement of the grating panel. Experiments were conducted in order to verify the feasibility of the proposed technique. Multi-mode fiber combined with a collimator was selected as an emitter and a receiver, and the beam width measurement system was contrived. Subsequently, the proposed method and the system were verified by comparing the experimental results with the results of the conventional charge-coupled device technique.