• Journal of the Institute of Electronics and Information Engineers
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• v.49 no.10
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• pp.102-108
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• 2012

The paper proposes an algorithm which finds a nonlinear cut path for a printed grayscale touching character image. The conventional algorithms were observed to fail in situations of complicated touching. We analyzed those situations, and based on the analysis results we identified problematic issues of the conventional algorithms. We modified the conventional algorithms in two aspects. First we propose a new penalizing term which is probable to guide correctly the cut path for touching situations difficult to separate. Second the preposed algorithm adopts a strategy of producing both the downward and upward paths and selecting better one. The experimental results on actual touching character images showed that the proposed algorithm was superior th conventional algorithms by 3~4% in terms of success ratio of separation.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.844-845
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• 2008

고온초전도체를 코일형태로 제작할 경우 코일사이 접합저항의 크기는 운전전류 및 전체시스템의 안정도를 결정할 때 중요한 부분을 차지한다. 특히 극저온 냉동기를 이용한 전도냉각 시스템의 경우는 액체냉매를 이용한 냉각시스템보다 더욱 중요하게 접합저항에 의한 열손실이 고려 되어야한다. 현재 저자들은 전도냉각형 2T 마그네트를 제작하고 있다. 권선에 사용된 도체는 Sumitomo Electric Industries, Ltd(SEI) DI-BSSCO H type이다. 이 도체는 stabilizer가 없는 기계적으로 매우 약한 도체이다. 본 논문에선 stabilizer가 없는 도체로 권선된 코일의 경우 발생 할 수 있는 문제점에 대해 나타내었고 안정된 접합을 위해 고려되어야 할 사항에 대해 논의하고자한다.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.08a
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• pp.274-274
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• 2010

최근 들어 나노선을 이용한 pn 접합 소자 연구 결과가 매우 활발하게 보고되고 있다. 그러나, 서로 다른 두 종류의 나노선으로 pn 접합 어레이 구조의 소자를 제작할 때, 나노선을 원하는 위치에 정렬하는 기술상의 어려움이 큰 걸림돌이 된다. 본 연구에서는 p-CNT와 n-$SnO_2$ 나노선을 이용한 pn 접합 어레이 구조를 제작할 수 있는 독창적인 공정기술을 제안한다. 먼저 $SiO_2$가 300 nm 성장된 Si 기판을 선택적으로 패터닝하여 BOE (6:1) 용액으로 $SiO_2$ 층을 80 nm 정도 선택적으로 에칭한 후, 선택적으로 에칭된 표면에 슬라이딩 장비를 이용하여 화학기상증착법(chemical vapor deposition: CVD)으로 성장된 n-$SnO_2$ 나노선을 전이시킨다. 그 다음 thermal tape를 이용하여 CVD 법으로 성장된 랜덤 네트워크 형태의 CNT를 $SnO_2$ 나노선이 전이된 기판 위에 전이 시킨다. 이때 성장된 CNT 필름 중 금속성 나노선을 통한 전하 이동을 감소시키기 위해, 촉매로 사용되는 페리틴의 농도를 낮춰서 전체적인 CNT의 농도를 줄이는 방법을 이용하였다. 따라서, 성장된 CNT 필름은 별도의 후처리 없이 p-형의 반도체성을 보였다. 제작된 pn-소자는 정류비가 ~103 인 정류특성을 보였으며, 254 nm 파장의 UV lamp를 조사하여 광전류가 발생하는 것을 확인하였다. 연구결과는 이종의 나노선 접합에 의한 다이오드 응용과 UV 센서응용 가능성을 보여준다.

• Journal of Korean Society of Steel Construction
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• v.16 no.5 s.72
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• pp.565-574
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• 2004

The purpose of this paper was to investigate the block shear and the fracture in the net section, according to AISC Specifications, by analysing the shear lag effect in the block shear rupture of the single angle with three or four bolt connection. Specimen with three or four bolt connections showed that failure generally went from block shear with some net section failures to classic net section failures. From the test results, showed that the connection length, the thickness of angle, and reduction factor, which affect the block shear rupture, were investigated. According to the test results, it is suggested that the calculation of the net section rupture capacity by using the reduction factor of U, that was suggested by Kulak, is needed.

• KIEAE Journal
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• v.10 no.6
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• pp.145-151
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• 2010

Bearing wall system was used extensively in most multi-residential apartment buildings in Korea. However, bearing wall apartments have the lack of architectural plan flexibility, remodelling-incompatible, causing serious economic losses in terms of construction waste. Recently, many researchers have studied the use of Rahmen structure as a potential alternative. The beam-column connection in the paper for long-life apartment housing forms connection of a Rahmen structure utilizing the advantages of steel and reinforced concrete. In addition, reduction of cast-in place concrete and construction schedule is expected by using precast concrete. Reduction effect of quantity decreased construction costs and $CO_2$ emission of key construction materials. However, verifying the feasibility of new construction method entails numerous challenges. Accordingly, the purpose of this study is to analyze the construction feasibility of sleeve, coupler, and pressure welding connections for long-life apartment building structure. A 3D modeling software was used to perform the analysis, and a real scale model was created to verify the results of construction feasibility. By verifying the construction feasibility of beam-column connections, this study will contribute to the efficient application of these methods on construction sites.

• Journal of Korean Association for Spatial Structures
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• v.8 no.3
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• pp.91-99
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• 2008

As number of the buildings increases, it shows new trends such as twisted, tilted, taperer shape. As a structural solution for the new trend buildings, diagonal grid (Diagrid) structure was developed. Though a few buildings was built using diagird system, the structural performance of the corresponding node was not clearly identified. Therefore, experimental evaluation is needed to apply diagrid for higher buildings. In this study, the node was tested depending on the amounts of welding materials. As a result, the partial welding can provide enough strength for the node as required in the full penetration welding under monotonin compressive loadings.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.623-626
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• 2004

The purpose of this paper is to determinate and to confirm p-n junction depth with nondestructive method by using electron beam. By measuring the critical short circuit current on the p-n junction which induced by electron beam and calculating generation range, the diffusion depth can be obtained. It ran be seen that values destructively measured by constant angle lapping and nondestructively by this study almost concur. As this result, it is purposed that diffusion depth of p-n junction can be easily measured by non-destruction. And this nondestructive method ran be recommended highly to the industrial analysis.

• The Korean Journal of Malacology
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• v.12 no.1
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• pp.19-31
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• 1996

국내 11개 지역(경기도 옹진군 덕적도, 경기도 의정부시 소요산, 강원도 춘천시, 충청남도 태안군 안홍, 경상북도 울릉군 울릉도, 전라북도 부안군 변산, 전라남도 신안군 홍도, 흑산도 비금도, 진도, 제주도)에서 채집된 달팽이 (A. despecta sieboleiana)를 대상으로 외부형태 분석과 동위효소를 검출하여 각 지역 집단간의 형태적, 유전적 유연관계와 변이 정도를 연구한 결과는 다음과 같다. 외부형태에 의한 집단간 유연관계는 안홍과 덕적도집단(average taxonomic distance, D=0.358)이 형태적으로 가장 유사한 집단으로 나타났다. Polyacrylamide gel을 사용하여 11가지의 동위효소를 검출한 결과 AKP, ACP, AO, EST, GPD, HBDH, LDH, SDH, XDH의 동위효소에서 유전적 다형현상이 나타났다. 전 집단의 평균 다형형의 빈도는 59.19%이며 이형접합자 빈도는 0.263이고 각 집단의 유전적 차이치는 춘천과 울릉도 집단이 0.066(genetic distance)으로 가장 높은 유사성을 보였다. 지리적 분포에 따른 외부형태 변이와 유전적 변이와의 관계는 유의성이 없었다.

• Journal of the Korea Concrete Institute
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• v.19 no.3
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• pp.265-273
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• 2007

The most common structural system for apartment buildings in Korea is adopted to combine structural systems: for example, a moment-resisting frame will be used for lower stories and bearing wall system for the upper stories. This type of buildings have soft and/or weak stories in lower stories, and it may lead to collapse of those buildings during the large earthquake. Reversed cyclic load tests were conducted to estimate the performance and behavioral characteristics of deep beam and exterior column Joints. Experimental parameter is the amount of transverse reinforcement (designed by ACI code and Sheikh's procedure). The results of this study are as follows: (1) The required transverse reinforcement of column designed by Sheikh's procedure requires 2.9 times larger than that designed by ACI procedure. Large amount of transverse reinforcement increase the ductility of the column. (2) Most of the lateral drift in the column is due to the flexural deformation in the joint and plastic hinge region and up-lift rotation. (3) Transverse reinforcement in the exterior column shall be required not only in the hinge region but also in the joint.

• Journal of the Korea Concrete Institute
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• v.14 no.6
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• pp.823-829
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• 2002

The composite frame system with reinforced concrete column and steel beam has some advantages in the structural efficiency by complementing the shortcomings between the two systems. The system, however has also a lot of problems in practical design and construction process due to the material dissimilarities. Considering these circumstances, this research is aimed at the development of the composite structural system which enables the steel beams to be connected to the R/C columns with higher structural safety and economy. Basically the proposed connection system is composed of four split tees, structural angles reinforced by stiffener, high strength steel rods, connecting plates and shear plates. The structural tests have been carried out to verify the moment transfer mechanism from beam flange to steel rods or connecting plates through the angle reinforced by siffener. The four prototype specimens have been tested until the flange of beam reached the plastic states. From the tests, no distinct material dissimilarities between concrete and steel have been detected and the stress transfer through wide flange beam - structural angle - high strength steel rod or connecting plate is very favorable.