• 한국산학기술학회논문지
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• 제11권4호
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• pp.1192-1196
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• 2010

자동차 배기계는 제한된 설치 공간으로 인하여 내구성과 연계된 형상을 최적화하여야 한다. 본 연구에서는 자동차 배기계를 구성하고 있는 Flexible Tube(Bellows)의 형상에 따른 응력 변화를 해석하였다. 아울러 Bellows의 변위량이 크게 발생하는 것을 고려하여 기하학적 비선형 해석을 실시하였으며 Bellows의 변형량은 끝단에서 6mm의 변위가 발생하도록 하였으며 얻어진 결과는 다음과 같다. (1) Bellows의 두께가 증가하거나 Bellows Tube의 반경이 증가하면 Von-Mises 응력은 비례적으로 증가한다. (2) Bellows의 주름의 반경이 증가함에 따라 주 응력이 감소하다가 증가함으로 Bellows 설계 시 최소 응력 산출을 위한 주름 반경의 선정이 요구된다.

• 소성∙가공
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• 제15권1호
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• pp.9-14
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• 2006

In the present research, the simultaneous punching of ultra small size hole of $2\~10\;{\mu}m$ in diameter on flat rolled thin metal foils was conducted with elastic polymer punch. Workpiece used in the present investigation were the rolled pure copper of $3{\mu}m$ in thickness and CP titanium of 1.5fm in thickness. The metal foils were punched with the dies and arrays of circular and rectangular holes were made. The process set-up is similar to that of the flexible rubber pad farming or Guerin process. Arrays of holes were punched successfully in one step forming. The punched holes were examined in terms of their dimensions. The effects of the wafer die hole dimension and heat treatment of the workpiece on ultra small size hole formation of the thin foil were discussed. The process condition such as proper die shape, pressure, pressure rate and diameter-thickness ratio (d/t) were also discussed. The results in this paper show that the present method can be successfully applied to the fabrication of ultra small size hole away in a one step operation.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제33권4호
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• pp.363-367
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• 2011

Genioplasy with osteotomy is a flexible and useful procedure. However, osteotomy can cause different types of morbidity. Chin augmentation with porous polyethylene ($Medpor^{(R)}$) has become popular in the recent years. Porous polyethylene ($Medpor^{(R)}$) is an excellent biomaterial for reconstructing facial deformities. $Medpor^{(R)}$ has a porous architecture, which prevents capsule formation and decreases the degree of foreign-body reaction. In addition, it can be easily cut with scissors and molded, and it also maintains its shape. We report here on a satisfactory case of chin augmentation with using porous polyethylene ($Medpor^{(R)}$).

• Journal of Electrochemical Science and Technology
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• 제11권2호
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• pp.155-164
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• 2020

Here we report our preliminary results about nickel phosphide (Ni-P) electroless coating on the surface of cellulose paper (CP) and its feasibility as the anode for lithium (Li) batteries. In particular, CP can act as a flexible skeleton to maintain the mechanical structure, and the Ni-P film can play the roles of both the anode substrate and the active material in Li batteries. Ni-P films with different P contents were plated uniformly and compactly on the microfiber strands of CP. When they were tested as the anode for Li battery, their theoretical capacity per physical area was comparable to or higher than hypothetical pure graphite and P film electrodes having the same thickness. After the large irreversible capacity loss in the first charge/discharge process, the samples showed relatively reversible charge/discharge characteristics. All samples showed no separation of the plating layer and no detectable micro-cracks after cycling. When the charge cut-off voltage was adjusted, their capacity retention could be improved significantly. The electrochemical result was just about the same before and after mechanical bending with respect to the overall shape of voltage curve and capacity.

• 복식
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• 제58권1호
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• pp.1-8
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• 2008

The purpose of this study was to investigate the mechanical properties and hand values of polypropylene knit and to analyze its color-fastness for light, laundering and abrasion, comparing to nylon and polyester knits. The results of this study were as follows: 1. Polypropylene stretched more with less force than nylon and polyester and its elastic recovery and shape stability were better than nylon and polyester. 2. Polypropylene was more flexible than nylon and polyester. 3. Polypropylene stretched more easily for shearing but its recovery from shearing was less than nylon and polyester. 4. Polyester had smoother surface than nylon and polyester. 5. Polypropylene was compressed more easily than polyester with less force but less than nylon. Its recovery from compression was more than nylon and polyester. 6. Polypropylene had lower KOSHI and SHARI values and higher FUKURAMI value than nylon and polyester. It had better T.H.V. value than nylon but less than! polyester. 7. Color fastness of polypropylene for lanudering, light, and abrasion in wet and dry conditions was good except polypropylene dyed with red color.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 추계학술대회논문집 I
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• pp.403-408
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• 2001

Structure-borne noise and vibration is one of the main complaints of home appliances such as refrigerators, washing machines, air conditioners, etc. There have been many efforts to reduce the emitting noise and vibration. Mostly the efforts have been concentrated to optimize the mounts shape and its material properties realizing that the vibration power is mainly transmitted to the structure via mounts. It is known that softer mounts have the better vibration isolation effect. But mounts have another important function in addition to the vibration isolation. That is to support the motor and compressor safely. Thus mounts should be stiff enough to resist the supporting items. But the two properties, stiff and soft, are contradict each other. So the designer should compromise the two complicity properties properly in between. Noticing that, motors and compressors themselves are very quite until they are connected to the base structure via mounts, wire connecting idea was proposed in this work. Instead of using conventional mounts, as shown in Fig 4, compressor was mounted using six wires as shown in Fig 5. Since wire is very flexible in bending but stiff in tension, we can realize the ideal mount design requirements, stiff enough to support and soft enough to isolate vibration power. The suggesting idea was tested with an air conditioner outdoor unit.

• Steel and Composite Structures
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• 제22권1호
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• pp.25-43
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• 2016

This paper presents the results of an experimental study investigating the effects of anchorage systems used in externally bonded steel plates on the strength and ductility of reinforced concrete structures. In the literature, diagonal steel plates bonded to frames were designed to be more flexible than the connections to eliminate the possible effect of the connection flexibility. However, to better evaluate the performance of the strengthened structures, the strength and behavior of connections should also be considered. The purpose of this study was to experimentally investigate the effects of different connection types of steel plates bonded to the frame using anchors on the strengthened RC structures. For this purpose, eleven specimens were designed to simulate the interior and exterior connection behavior. Two of these were used as the control beams and remaining nine for the investigation of the functionality of the end steel plates. Experimental results show that the load carrying capacity of the strengthened beams is directly related to the connection types of the steel plates. For the interior connections, L-shaped end plates that were strengthened using steel anchors must have adequate stiffness to prevent its shape. While, for the exterior connections, the connection with three anchors carried more load than the other exterior connections.

• 한국멀티미디어학회논문지
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• 제16권4호
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• pp.520-528
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• 2013

메이크업 시뮬레이션은 입력 장치와 디스플레이를 사용하여 가상의 디지털 얼굴에 다양한 화장법을 시험해 볼 수 있는 도구이다. 최근에 다양한 메이크업 스타일을 지원하는 시뮬레이션 시스템들이 개발되었지만, 대부분의 시스템들이 2차원 얼굴 영상을 사용하기 때문에 피부를 사실적으로 표현하는데 제약이 많다. 본 연구에서는 피부의 거칠기와 반사도를 조절할 수 있는 사실적인 3차원 메이크업 방법을 개발하였다. 제안 방법은 3차원 스캐너로 획득한 고해상도의 얼굴 데이터 상에서 피부 파라미터 값을 변경하면서 메이크업을 시뮬레이션할 수 있다. 또한 포인트 기반 형상표현을 사용하여 3차원 렌더링 과정을 간단하고 유연하게 표현하였으며, 얼굴 부위에 따라 반사도를 달리 적용하여 보다 사실적인 메이크업 시뮬레이션을 가능하게 하였다.

• 한국농촌건축학회논문집
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• 제16권1호
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• pp.111-117
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• 2014

The aim of this study is to find out the pattern of Ger form, inner spatial composition of Mongolian Ger house, and to take a dig at the structural or symbolic elements of nomadic architecture of Ger. To the point of view of corresponding to living and space of housing, remarkable characteristics of Ger Architecture is able to pull down and recombine the structures of nomadic house. Even though urbanization of Mongolia has spreading rapidly in a whole nation, most of people preserves traditional housing pattern within Ger. The ways of survey are to study of traditional home of Mongolia, and then field work at residence or mountain area in Ulan Bator and Gorkhi Terelj National Park area. This survey contains the form, size, structure, spatial composition of living space, structure, and materials. There are three results as follows: First, the form of Ger house is like a pyramidal or crown roof style to approximate to the round shape of it. Usually they had lived in nomadic way of life, so the Ger had a movable and flexible structure. Second, the Ger is easy to build up and deconstruct to move or find a new pasture. Third, the Mongolian Ger structure is composed by mainly five elements that are Khana, Khaalga, Toono, Bagana, and Uni. It has a hierarchy of internal spaces which are classified to gender, orientation, and property.

• 한국정보과학회논문지:데이타베이스
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• 제30권2호
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• pp.145-156
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• 2003

현존하는 대부분의 내용 기반 이미지 검색 시스템은 칼라, 모양, 텍스처 특징을 이용한 유사도-기반 검색에 초점을 맞추고 있다. 신경과학 이미지 데이타베이스의 경우, 이미지에 대한 전역적 평균 특징 값을 기반으로 한 유사 이미지의 검색이 임상 병리학자들에게는 전혀 도움이 되지 않는 다는 것을 발견하였다. 신경과학 데이터베이스 상의 이미지에 대한 실용적인 내용 기반 검색을 실현하기 위해서는 이미지의 내부 내용이나 의미를 표현하는 일이 필요하다. 본 논문에서는 이러한 이미지들에 대해 보다 유용한 검색을 지원하기 위하여 이미지 내용과 그에 관련된 개념 지식을 표현하는 방법을 제시한다. 또한 객체지향 메시지 경로 식을 이용하여 이러한 고급 검색을 지원하기 위한 연산의 의미를 기술한다. 제안된 기법은 유연하고 확장 가능하므로 보다 강화된 내용 검색을 위해 이미지 내용에 대한 보다 많은 의미를 점진적으로 추가해 나갈 수 있다.