• Journal of the Korean Institute of Intelligent Systems
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• v.15 no.5
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• pp.599-604
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• 2005

This paper presents fuzzy rules to predict diagnosis of Wisconsin breast cancer with minimized number of feature in put using the neural network with weighted fuzzy membership functions (NEWFM) and the non-overlap area distribution measurement method. NEWFM is capable of self-adapting weighted membership functions from the given the Wisconsin breast cancer clinical training data. n set of small, medium, and large weighted triangular membership functions in a hyperbox are used for representing n set of featured input. The membership functions are randomly distributed and weighted initially, and then their positions and weights are adjusted during learning. After learning, prediction rules are extracted directly from n set of enhanced bounded sums of n set of small, medium, and large weighted fuzzy membership functions. Then, the non-overlap area distribution measurement method is applied to select important features by deleting less important features. Two sets of prediction rules extracted from NEWFM using the selected 4 input features out of 9 features outperform to the current published results in number of set of rules, number of input features, and accuracy with 99.71%.

• Tunnel and Underground Space
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• v.16 no.1 s.60
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• pp.26-37
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• 2006

This study addresses the applicability of box fractal dimension, $D_B$, as an index of statistical homogeneity of fractured rock mass. The box-count method's capability in quantifying the combined effect of fracture density and size distribution is examined systematically. Total of 129 two-dimensional fracture configurations were generated based on different combinations of fracture size distribution and fracture density. $D_B$was calculated for the generated fracture network systems using the box-counting method. It was found that was standard deviation of trace length and fracture orientation have no effect on calculated $D_B$. The estimated $D_B$ was found to increase with increasing total density and/or mean trace length. To explore the field applicability of this study, the statistical homogeneity of fractured rock mass was investigated at the rock slope and the underground facility using the box-counting method as well as conventional contingency table analysis. The results obtained in this study clearly show that the methodologies given in this paper have the capability of determining the statistical homogeneity of fractured rock mass.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.31-34
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• 2010

본 논문에서는 교량의 자유진동 모드의 중첩원리를 이용하여 KTX-교량의 동적상호작용 해석법을 제시한다. 이를 위하여 모드중첩법에 기초한 3차원 교량-차량의 에너지 식으로부터 에너지원리를 적용하여 교량과 차량의 상호작용을 고려할 수 있는 운동방정식을 유도한다. 이때 운동방정식의 해는 Newmark-${\beta}$ 방법을 사용한다. 그리고 궤도의 불규칙성은 FRA의 6등급 분류규정을 고려하여 각 등급별로 고속철도의 열차속도에 따르는 응답을 분석한다. 실제 고속철도에 사용되는 PSC 박스형 교량을 상용프로그램(MIDAS)를 이용하여 모델링하고 그로부터 각 모드별 형상을 얻어내어 본 논문에서 개발한 열차-교량 상호작용 프로그램에 입력하여 상호작용 해석을 수행한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.6 no.2
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• pp.122-128
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• 2005

A feasibility study on the application of self?shielded flux cored arc welding to the on-site SM520 steel bridge box fabrication for express trains and high way construction instead of gas-shield flux cored arc welding was conducted in terms of weld soundness, mechanical properties, toughness and microstructures. All welded specimens made with the self?shielded FCAW process were tested by magnetic particle and ultrasonic techniques and they were found to be sound. All multipass weld specimens made with both self-shielded and gas-shielded FCAW processes showed yield and tensile strengths of $462{\sim}549\;MPa$ and $548{\sim}640\;MPa$, respectively. The impact values of Charpy V-Notch weld specimens also met with the required value of 40J at $-20^{\circ}C$. The hardness values of the top area of weldments were higher than those of the bottom area because of higher residual stresses in the near surface. It was found that welding characteristics of SM520 steel by the on-site welding conditions with self-shielded FCAW showed almost equivalent to those by gas-shielded FCAW in terms of sound welds, mechanical properties and microstructure.

• Journal of the Korean association of regional geographers
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• v.16 no.4
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• pp.387-399
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• 2010

This study, using Fractal theory, aims to examine the meaning in the aspect of urban spatial structure by reflecting the characteristics of elements organizing the urban space and at the same time measuring the urban form quantitatively. By calculating Fractal Dimension to Cheongju as a target, it conducted comparison and analysis by dividing building and road which are internal element of a space into the whole city and urbanized area to compare and analyze validity of the theory application and the inside of an actual urban space. For the method of an analysis, it calculated Fractal Dimension by linking a digital map including the property of building and road with GIS program and using box counting. An analysis result showed that the result value of Fractal Dimension by structure and road is all high and similar. It drew a similar result value from the whole Cheongju and the urbanized area as well, but commercial and industrial area showed low result value from the partial viewpoint. However, it is correct to regard these spaces as one space because they are intimately connected with a residential area. From the general viewpoint, it could be said that Cheongju's Fractal Dimension grows in the context of a urbanized area.

• Journal of Korean Society of societal Security
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• v.2 no.4
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• pp.59-65
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• 2009

The rebound test using Schmidt hammer is most popular method to estimate strength of concrete. However, this method is inappropriate for Seoul Metro underground structures due to unsuitable aging effects. Consequently, the strength presumption equation of underground structures is proposed according to the correlation of uniaxial compressive strength, rebound test results and age of concrete. To achieve this, the results of in-depth inspection of Seoul Metro underground structures performed annually for last 8 years was anlayed.

• Proceedings of the KAIS Fall Conference
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• 2011.05b
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• pp.847-849
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• 2011

Flocking 공정은 aspect ratio가 큰 단섬유를 플라스틱 등의 기판에 접착시키는 기술이다. 이 연구에서는 플라스틱 제품으로 자동차의 콘솔박스 상에 접착제를 코팅하고 이후에 전기장을 가하여 섬유를 기판 상에 수직으로 접착시킬 경우 섬유조직의 발달과 불량 요인을 분석함으로써 향후 품질 개선을 도모하고자 한다.

• Venture DIGEST
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• s.129
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• pp.14-16
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• 2009

복제방지 기술은 저작권이 있는 소프트웨어, 영화, 음악 등에 대해 불법적인 재생산을 막기 위한 기술적보호조치 중의 하나이다. 기술적보호조치를 우회하거나 무력화하는 행위에 대해서는 법에서 금지하고 있으며, 효과적이고 상당한 수준의 기술적보호조치가 요구되고 있다. 현재까지 인터넷 기반의 PC플랫폼을 중심으로 발전되어 왔던 복제방지 기술도 디지털 방송 및 다양한 휴대 기기의 발달과 이용 형태의 변화에 따라 복제방지 기술 또한 다양한 요구사항을 만족시키기 위한 보호기술로 확장되어 왔다. 소프트웨어 및 디지털 콘텐츠 제작자들은 좀 더 자극적이고 능동적이고 불법 복제 및 유통을 차단하기 위하여 복제 방지기술을 도입하고 있으며 MP3폰, 셋탑박스 등에 필수적으로 탑재되고 있다.

• 한국방재학회:학술대회논문집
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• 2007.02a
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• pp.297-302
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• 2007

Although just developed in recent years, curved box girder has widely used in modern highway system due to their load resistance capacity as well as aesthetic considerations. According to recent literature reviews on curved box girder designs, distortional load was not considered as much as it deserves to be. In practice, the effect of distortional force is very small in straight bridge systems but yet unknown how it is in curved bridge systems. For the reason, this paper will show an extensive parametric study on distortional behavior. Based on Dabrowski formulas, using finite element method, various bridges were investigated. In this study, following parameters will be included: span length, curvature radius, section height, section width, and internal section angle (web slope). From the obtained results, some initial geometric parameters are proposed for curved box girder bridges.

• Journal of KIISE:Software and Applications
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• v.36 no.7
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• pp.539-547
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• 2009

Software product line (SPL) engineering is an emerging paradigm for successful software reuse and has been adopted for various industrial and consumer products to improve their productivity and quality. However, most SPL methods require high initial costs and long development time, which makes many companies hesitate to adopt the SPL paradigm. In this paper we introduce a method to construct an SPL by extracting core assets from legacy components based on the feature model, which requires less initial time and effort. We also present a case study on cable set-top box software to illustrate the applicability of this method, and lessons learned that will provide guidelines for many companies to adopt the SPL paradigm.