• 한국기계가공학회지
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• 제16권4호
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• pp.24-29
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• 2017

This paper provides an experimental analysis on the breakage of the coated tool using the face-milling cutter of the machining center due to changes in the cutting speed and the feed rate. The experimental studies were conducted using STS 304 materials and the damage to the tool was analyzed according to the change in machining time. The experiments confirmed that the cutting speed and feed rate affected the tool damage and the mechanical impact and thermal shock were determined to severely damage the tool. From the production engineering point of view, it has been experimentally investigated that the increased feed rate significantly influences the material removal rate more than the increased cutting speed.

• Nuclear Engineering and Technology
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• 제49권1호
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• pp.216-223
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• 2017

In this work, linear and mass attenuation coefficients, effective atomic number and electron density, mean free paths, and half value layer and $10^{th}$ value layer values of barium-bismuth-borosilicate glasses were obtained for 662 keV, 1,173 keV, and 1,332 keV gamma ray energies using MCNP-4C code and XCOM program. Then obtained data were compared with available experimental data. The MCNP-4C code and XCOM program results were in good agreement with the experimental data. Barium-bismuth-borosilicate glasses have good gamma ray shielding properties from the shielding point of view.

• 디자인학연구
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• 제14권4호
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• pp.99-108
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• 2001

부적에는 고대의 다양한 기호나 그림, 원형문자가 사용되어 왔으며 현재도 쓰여지고 있다. 이는 체계화된 문자와 조합되어 다양한 표현으로 메시지를 전달하고 있으며, 현재도 전통적인 방법이 고수되는 반면 지속적인 변화를 통해 인간의 감정과 욕망을 표현하고 있다. 부적은 일반적 견해로 생각하는 실험 타이포그래피 만큼이나 논리적이며 실험적인 성격이 강하다. 또한 문자가 가지고 있는 의미로 다른 기호나, 상형문자, 그림 및 유사단어로 표현하고 있다. 각각의 요소들은 상징적 심볼 및 연상성, 글의 해체성 등 다양성을 갖추고 있었다. 이러한 타이포그래피의 실험적 성격을 더욱 실험적으로 표현가능성을 보여 주고 있는 부적에서 배워야할 해체와 구성작업을 회화적 타이포그래피 관점으로도 눈여겨볼 점이 많았음이 관찰되었다. 본 연구는 부적이 가지고 있는 조형적 특징을 실험 타이포그래피와 비교, 분류, 분석하여 부적이 가지고 있는 조형적 특징이 시각적 언어와 타이포그래피 표현으로 응용될 수 있는 가능성을 살펴보고자 한다. 또한, 한국적 조형 문화로서 부적이 형태적 물성이 가지는 시각 이미지에 대한 재인식과 그 가능성에 대한 모색은 타이포그래피의 서구적인 고정된 틀을 벗어나 우리의 문화와 정서에 맞는 타이포그래피의 표현 영역을 화장하는 것이 앞으로의 과제라 할 수 있다.

• 한국정보통신학회논문지
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• 제21권11호
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• pp.2153-2166
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• 2017

웹 앱에는, 서로 다른 웹 페이지를 웹브라우저에 로드할 때 동일 데이터가 반복적으로 획득되고 처리되어 화면상에 표시되는 문제가 있다. 본 논문은 이 문제를 해결하기 위해 자바 웹 앱을 재구조화하는 기법을 제안하고 평가한다. 자바 웹 앱을 MVC(Model-View-Controller) 아키텍처 관점에서 동적 분석하고 컴포지트 뷰 패턴을 활용하여 중복해서 사용되는 데이터를 식별한다. 이를 토대로 페이지 요청 시 중복 데이터가 로드되지 않도록 앱을 재구조화한다. 재구조화를 통해 MVC 아키텍처에 부합하며 성능이 향상된 웹 앱을 생성한다. 이렇게 재구조화된 웹 앱은 기존 웹 앱의 응답 시간을 데스크톱 PC, 모바일 기기에서 각각 38%, 55% 개선하였다. 아울러 오픈 소스 웹 앱을 이용한 사례 연구를 통해 제안하는 기법의 적용 가능성을 보였다.

• 한국도서관정보학회지
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• 제4권
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• pp.91-111
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• 1977

The view point of the library is treated as a first subject. This study is scheduled to construct, as a experimental study, the system of the Library Science. The study of this fields is called upon greatly because the trial to understand library as a socio-cultural phenomenon did not study as many times. As a result of the study, library is defined as ${\ulcorner}Structural Formation of Inquirying Behavior{\lrcorner}$. Not only technique and actual proof are possible in this study but also this definition is technical definition to indicate the main phenomenon of Librarial Behavior. This schedule represent the trial to define Library Behavior which could anticipate and fabricate when we analyze this definition First, we can find out, first of all, the researching behavior among the human behaviors and then human behavior has the condition of practice. At last, researching behavior can not have any result when it is a natural situation, it has only the meaning when it is guided by an obvious intention. The object of the library is just this human behavior. Second, Formation permits the guidance and self-control at the same-times. The answer about what we find out and practice make it possible the act of guidance. This guidance can't burden any subject but permit the people to result his own researching behaviors. He can save his activities, his own researching behaviors by the result of it. Third, The statematical means efficient performances, and them efficient performances is impossible, here is 'discoveries' of behavior itself. The system of the library is the formation of the relation between the accumulated civilizations and accumulated civilizations. As the definitions of the above mentions, library has the big abilities to the creation and succession of the civilization. As the contemporary view-points, there are some questions about the above described definition can meet it of the library. When we frame the science of library as the learning systems, we can't but the library as this definitions.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권10호
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• pp.2663-2678
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• 2012

Due to sharp depth transition, big holes may be found in the novel view that is synthesized by depth-image-based rendering (DIBR). A hole-filling method based on disparity map is proposed. One important aspect of the method is that the disparity map of destination image is used for hole-filling, instead of the depth image of reference image. Firstly, the big hole detection based on disparity map is conducted, and the start point and the end point of the hole are recorded. Then foreground pixels and background pixels are distinguished for hole-dilating according to disparity map, so that areas with matching errors can be determined and eliminated. In addition, parallaxes of pixels in the area with holes and matching errors are changed to new values. Finally, holes are filled with background pixels from reference image according to these new parallaxes. Experimental results show that the quality of the new view after hole-filling is quite well; and geometric distortions are avoided in destination image, in contrast to the virtual view generated by depth-smoothing methods and image inpainting methods. Moreover, this method is easy for hardware implementation.

• Earthquakes and Structures
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• 제23권4호
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• pp.363-371
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• 2022

Traditional metal dampers have disadvantages such as a higher yield point and inadequate adjustability. The experimental results show that the low yield point steel has superior energy dissipation hysteretic capacity and can be applied to seismic structures. To overcome these deficiencies, a novel compound metal damper comprising both low yield point steel plates and common steel plates is presented. The optimization objectives, including "maximum rigidity" and "full stress state", are proposed to obtain the optimal edge shape of a compound metal damper. The numerical results show that the optimized composite metal damper has the advantages such as full hysteresis curve, uniform stress distribution, more sufficient energy consumption, and it can adjust the yield strength of the damper according to the engineering requirements. In view of the mechanical characteristics of the compound metal damper, the equivalent model of eccentric cross bracing is established, and the approximate analytical solution of the yield strength and the yield displacement is proposed. A nonlinear simulation analysis is carried out for the overall aseismic capacity of three-layer-frame structures with a compound metal damper. It is verified that a compound metal damper has better energy dissipation capacity and superior seismic performance, especially for a damper with double-objective optimized shape.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 봄 학술발표회 논문집(I)
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• pp.199-204
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• 1998

To analysis the failure character of Low-Heat concrete which is used to prevent the thermal crack caused by hydration heat, static loading test was performed by this test method, "Determination of the Fracture Energy of Motar and Concrete by Means of Three-Point Band Tests on Notched Beam" (suggested by RILEM 50-FMC Committe). This study compared and analysised the fracture energy of Mode I (opening mode), the most general pattern in the view of water-cemente ratio(W/C), compressive strength and age of Ordinary Portland Concrete and Low-Heat Concrete under the same mixture. The test results show that the case of Ordinary Portland Concrete and Low-Heat Concrete, low Water-Cemente ratio(W/C) cause the increase of fracture energy, and high failure-strength decrease failure-deflection, and the fracture energy of Low-Heat Concrete is similar to Ordinary Portland Concrete as the age increase. increase.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
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• pp.133-136
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• 2004

We are going to procedure various view from two frontal image using trifocal tensor. We found that warping is effective to produce synthesized poses of a face with the small number of mesh point of a given image in previous research[1]. For this research, fundamental matrix is important to calculate trifocal tensor. So, in this paper, we investigate two existing algorithms: Hartley's[2] and Kanatani's[3]. As an experimental result, Kenichi Kantani's algorithm has better performance of fundamental matrix than Harley's algorithm. Then we use the fundamental matrix of Kenichi Kantani's algorithm to calculate trifocal tensor. From trifocal tensor we calculate new trifocal tensor with rotation input and translation input and we use warping to produce new virtual views.

• Journal of the Optical Society of Korea
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• 제13권1호
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• pp.131-138
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• 2009

The similarity between two groups of displaying methods is demonstrated in two ways, analytically and experimentally. A variety of layouts of the integral photography and display devices based on the point light source model is classified and analyzed in terms of projections and common/separate image planes. In particularly, the transformation matrix is found. Simulation experiments based on the image processing were performed. The layouts, analytical formulas, and experimental results show the similarity of both groups for several layouts.