• 한국도로학회논문집
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• 제13권2호
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• pp.77-83
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• 2011

이 연구는 회전교차로의 효과를 다루고 있다. 연구의 목적은 로터리를 회전교차로로 전환함에 따른 운영효과를 비교 분석하는데 있다. 이를 위해 이 연구에서는 국내에서 운영되고 있는 로터리 20개 지점을 조사하고, VISSIM을 통해 개선 전 후의 네트워크를 구축하며, 그 효과를 비교분석하는데 중점을 두고 있다. 국내의 로터리는 효과적인 회전교차로 운영을 위하여 기하구조 측면에서 많은 개선이 필요한 것으로 분석되었다. 연구의 주요결과는 다음과 같다. 첫째, 현재 교통량을 적용하였을 경우 로터리의 운영효과는 다소 좋은 것으로 나타나지만 그 차이는 매우 적은 것으로 평가되었다. 둘째, 도시부 로터리의 경우 교통량이 증가할수록 차량당 평균지체가 급격히 증가하는 것으로 분석되었다. 마지막으로 지방부의 경우 도시부에 비해 교통량이 적기 때문에 회전교차로의 평균속도는 로터리에 비해 약 10km/h의 속도저감효과를 갖는 것으로 평가되었다.

• 한국강구조학회 논문집
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• 제24권1호
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• pp.119-128
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• 2012

본 연구에서는 실험적 모드해석 기법을 이용하여 외부환경에 직접 노출되어 있는 실제 철도판형교의 full-scale 동적 테스트가 수행되었다. 충격해머 모드실험에 의해 얻어진 철도판형교의 모드 매개변수를 유한요소해석으로부터 구한 고유진동수와 모드형상과 비교, 분석하였다. 실험적 모드해석에 의해 측정된 실험 데이터와 해석적 진동분석에서 얻어지는 출력만의 데이터를 교량 부재의 기하학적 특성 및 재료적 특성을 다양하게 고려하여 모델보정 테크닉에 적용하였다. 철도판형교의 실험적 모드해석 결과를 검증하기 위한 유한요소모델이 모드인식 기법을 이용하여 보정되었다. 실험 데이터와 유한요소해석 기준모델의 모델보정과정의 결과와 함께 부재특성의 변화를 통하여 이루질 수 있는 손상평가에 대한 기초적 데이터베이스가 제공된다.

• 한국산학기술학회논문지
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• 제11권9호
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• pp.3422-3427
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• 2010

본 논문에서는 빠르게 움직이는 화물 대상체의 효율적인 검색을 위해 스테레오 X-선 영상을 이용하여 장치 켈리브레이션을 통한 최적화된 구조에 대하여 연구하였다. 스테레오 X-선 스캔 영상은 X-선 발생장치, 듀얼 라인 어래이 검출기, 컨베이어 시스템 등으로 구성된 특별하게 제작된 스테레오 X-선 검색 장치로부터 획득하였다. 스테레오 X-선 영상을 이용하여 영상과 실제 대상체의 3차원 형상 구성사이의 관계를 찾기 위해 센서에 대한 캘리브레이션을 수행하였다. 스테레오 영상을 얻기 위해 구성된 두 개의 검출기 사이의 거리를 다양하게 변화 시키며 획득한 영상을 이용하여 영상에서의 GCP(Ground Control Point)에 대하여 계산 하였다. 계산된 GCP 값과 실제 대상체의 GCP의 좌표값을 비교하여 오차가 작은 효율적인 장치의 구조에 대하여 결과를 얻었다. 실험의 결과는 화물검색을 위한 영상의 효율적인 가시화 및 스테레오 매칭의 정확도를 향상시키기 위해 활용될 것이다.

• 한국실내디자인학회논문집
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• 제20권3호
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• pp.190-197
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• 2011

The purpose of this study is to examine the characteristics of space design appearing in facade and interior composition factors of buildings in the colonial period in Indonesia. Research method is a field study, and subjects of the study is 14 buildings built in the colonial period located in Jakarta. The research result is as follows. First, Facade is divided into C type (colonial style), CT type (colonial style + traditional style), CA type (colonial style + art deco style), and CTA type (colonial style + traditional style + art deco style). Among them, CT type which shows both a colonial style and traditional style accounts for the most. As for Java traditional style mainly shows Joglo roof style and bratticing decoration on top of gates, and the colonial style presents both an Amsterdam canal housing style such as narrow Facade and unusual Gable, and a classical style such as pediment, entablature, and columns. Second, interior space is divided into C type (colonial style), CT type (colonial style + Indonesian traditional style), A type (art deco style), and CA type (colonial style + art deco style). Among them, CT type was also accounted for the most. Selected traditional style is a shape of bratticing decoration on top of gates and a shape of tenon of Joglo housing structure. Colonial style showed classical style such as exposed crossbeams, columns, and pilasters, and as for unique decoration, there are Ancona decoration and Delft tile decoration. On one hand, art deco style used typical art deco factors such as contrast of various materials and complementary color or golden color use as well as zigzag or vertical lines and geometric ornament by combining with colonial style or traditional style. It is expected that such research result will be a practical reference data when Korean construction companies or interior design companies advance Indonesia.

• 전기학회논문지P
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• 제66권4호
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• pp.242-246
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• 2017

In this study, it was investigated about optical simulation in high brightness and high uniformity general lighting using glass light guide plate. And we adopt edge-light emission type light plate. Edge-light type lighting has been used LCD application, especially note PC or smart phone backlight unit. Because it had the good properties such as slim shape and light weight. We thought this type was suitable for general lighting application such as wall attached type or ceiling mount type. But many of edge-light type lighting had problems. It called slanted output light rays. That was main key parameter how could control the direction of output light rays. We investigated the solution of this problems, using ray tracing method, we recognized the major fact of the solution relied on the geometric structure of diffusing dot shape. We set the conditions of aspect ratio in diffusing dot shape such as 0.5 to 1. And, at first, we designed diffusing dots shape based on the results of optical simulation and made specimen. as above condition, and acquired good result in confirming dots shape such as the value of the output rays's peak angle was around 75 degrees. And good light distribution characteristics were measured by slated spectro-radiometer. It was shown that the effective ways of designing light distribution characteristics using optical simulation such as ray tracing linear method for making general lighting using glass light guide plate.

• 한국실내디자인학회논문집
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• 제26권5호
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• pp.106-116
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• 2017

In the 1900s, the cultural crossing of East and West was realized through the acceptance and reproduction of culture. Cultural change in the Orient was the result of attempts to harmonize the West's images, which they chose in their respective countries, with their own culture. However, research on design history until now has been centered on the West, and East was regarded as a beneficiary of civilization inherited from Western's. From the point of view of Western design history as a main trend, the unique characteristics of Korean design culture are not revealed. Therefore, through this studies, we want to distinguish Korea's modern design, which has been recognized as a minority. For the study, through the wallpaper, which is one of the detailed components of the interior space in modern times, we try to analyze the socio - cultural historical factors and design characteristics influencing the formation of the interior space in modern times. Summarizing a result of research. The early modern wallpaper of England mainly uses plants as motifs. But In Korea, animal patterns and letter patterns were used. The reason why European wallpaper was mainly a plant at the time was that the structure of the motif was useful for the process of creation. However, in the case of the Korean wallpaper pattern, the theme was selected according to the meaning of the motif, and it was abstracted appropriately for the 2D design. As a result, many geometric shapes were formed. In addition, European wallpaper pattern is more complex and organic than Korean wallpaper pattern. Therefore, the boundary of the central pattern as the basic unit is unclear and the patterns are connected. The pattern development method is not a simple repetition but a combination of symmetry and repetition. In Korea, on the other hand, the boundaries of unit patterns are clear and patterns are developed by simple repetition. There are many diamond-type repeating patterns in particular.

• 한국정밀공학회지
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• 제25권2호
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• pp.148-155
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• 2008

The aim of the study is to interpret the distribution of occlusal force by 3-dimensional finite element analysis of ISP(Implant Supported Prosthesis) supported by minimum number of implant to restore the edentulous patients. For this study, the Astra Tech implant system is used. Geometric modeling for 6 and 4 fixture ISP group is performed with respect to the bone, implant and one piece superstructure, respectively. Implants are arbitrarily placed according to the anatomical limit of lower jaw and for the favorable distribution of occlusal force, which is applied at the end of cantilever extension of ISP with 30mm. Element type is tetrahedral for finite element model and the typical mechanical properties, Young's modulus and Poisson's ratio of each material, cortical, cancellous bone and implant material are utilized for the finite element analysis. From this study, we can see the distribution of equivalent stress equal to real situation and speculate the difference in the stress distribution in the whole model and at each implant fixture, From the analysis, the area of maximum stress is distributed on distal contact area between bone and fixture in the crestal bone. The maximum stress is 53MPa at the 0.2mm area from the bone-implant interface in the maximum side for 300N load condition for 4 fixture case, which is slightly less than the stress calculated from allowable strain. This stress has not been deduced to directly cause the loss of crestal bone around implant fixture, but the stress can be much reduced as the old peoples may have lower chewing force. Thus, clinical trial may be performed with this treatment protocol to use 4 fixtured ISP for old patients.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.859-865
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• 2007

This paper presents a method to analyze the unbalance response of a high speed polygon mirror scanner motor supported by sintered bearing and flexible supporting structures by using the finite element method and the mode superposition method. The appropriate finite element equations for polygon mirror are described by rotating annular sector element using Kirchhoff plate theory and von Karman non-linear strain, and its rigid body motion is also considered. The rotating components except for the polygon mirror are modeled by Timoshenko beam element including the gyroscopic effect. The flexible supporting structures are modeled by using a 4-node tetrahedron element and 4-node shell element with rotational degrees of freedom. Finite element equations of each component of the polygon mirror scanner motor and the flexible supporting structures are consistently derived by satisfying the geometric compatibility in the internal boundary between each component. The rigid link constraints are also imposed at the interface area between sleeve and sintered bearing to describe the physical motion at this interface. A global matrix equation obtained by assembling the finite element equations of each substructure is transformed to a state-space matrix-vector equation, and both damped natural frequencies and modal damping ratios are calculated by solving the associated eigenvalue problem by using the restarted Arnoldi iteration method. Unbalance responses in time and frequency domain are performed by superposing the eigenvalues and eigenvectors from the free vibration analysis. The validity of the proposed method is verified by comparing the simulated unbalance response with the experimental results. This research also shows that the flexibility of supporting structures plays an important role in determining the unbalance response of the polygon mirror scanner motor.

• Journal of Microbiology and Biotechnology
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• 제26권10호
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• pp.1746-1754
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• 2016

Recently, spherical beads entrapping quorum quenching (QQ) bacteria have been reported as effective moving QQ-media for biofouling control in MBRs for wastewater treatment owing to their combined effects of biological (i.e., quorum quenching) and physical washing. Taking into account both the mass transfer of signal molecules through the QQ-medium and collision efficiencies of the QQ-medium against the filtration membranes in a bioreactor, a cylindrical medium (QQ-cylinder) was developed as a new shape of moving QQ-medium. The QQ-cylinders were compared with previous QQ-beads in terms of the QQ activity and the physical washing effect under identical loading volumes of each medium in batch tests. It was found that the QQ activity of a QQ-medium was highly dependent on its specific surface area, regardless of the shape of the medium. In contrast, the physical washing effect of a QQ-medium was greatly affected by its geometric structure. The enhanced anti-biofouling property of the QQ-cylinders relative to QQ-beads was confirmed in a continuous laboratory-scale MBR with a flat-sheet membrane module.

• 디자인학연구
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• 제20권1호
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• pp.89-100
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• 2007

본 연구는 타나카 잇코(Tanaka Ikko)씨의 작품을 통해 일반적으로 우리가 알고 있는 그의 작품 경향이 실제로 인상평가를 통해서 나타난 결과와 그로 인한 표현경향을 고찰하는 것을 목적으로 한다. 이번에 평가 대상으로 선정한 포스터는 일본의 그래픽 디자이너 타나카 잇코(Tanaka Ikko)씨의 작품중 산케이신문사 주최의 칸세이노(관세능(觀世能)) 포스터 시리즈 중 9점을 선정했다. 샘플의 선정 이유는 지극히 구조적인 성격이 강하며 비교적 단순한 구조로 이루어져 있다고 판단했기 때문이다. 인자분석을 실시한 결과 3개의 인자로 일반적으로 타나카 잇코(Tanaka Ikko)씨의 포스터 작품을 설명할 수 있는 대표적인 인자로 사용가능한 결과를 얻었다. 군집분석에서 인상이 나뉜 3그룹별 포스터의 표현경향을 고찰해 보면 먼저 제1그룹의 경우는 전통적 소재를 활용하여 동양적 이미지가 강하다. 제2그룹의 경우는 기하학적 도형을 심플하게 배치하여 모던한 이미지가 강하다. 제3그룹의 경우는 전통적 소재를 모던한 이미지로 표현했다. 이상의 결과를 통해 타나카 잇코씨(Tanaka Ikko)의 작품 경향은 $\ulcorner$일본의 전통적 이미지를 현대적으로 발전시켰다$\lrcorner$ 고 요약할 수 있다.