• Advances in Computational Design
• /
• 제8권4호
• /
• pp.327-351
• /
• 2023

This article explores how multi-objective optimization techniques can be used to design cost-effective and structurally optimal spatial steel structures, highlighting that optimizing performance can be as important as minimizing costs in real-world engineering problems. The study includes the minimization of maximum horizontal displacement, the maximization of the first natural frequency of vibration, the maximization of the critical load factor concerning the first global buckling mode of the structure, and weight minimization as the objectives. Additionally, it outlines a systematic approach to selecting the best design by employing four different evolutionary algorithms based on differential evolution and a multi-criteria decision-making methodology. The paper's contribution lies in its comprehensive consideration of multiple conflicting objectives and its novel approach to simultaneous consideration of bracing system, column orientation, and commercial profiles as design variables.

• 한국측량학회지
• /
• 제32권3호
• /
• pp.205-216
• /
• 2014

Multi-camera systems have been widely used as cost-effective tools for the collection of geospatial data for various applications. In order to fully achieve the potential accuracy of these systems for object space reconstruction, careful system calibration should be carried out prior to data collection. Since the structural integrity of the involved cameras' components and system mounting parameters cannot be guaranteed over time, multi-camera system should be frequently calibrated to confirm the stability of the estimated parameters. Therefore, automated techniques are needed to facilitate and speed up the system calibration procedure. The automation of the multi-camera system calibration approach, which was proposed in the first part of this paper, is contingent on the automated detection, localization, and identification of the object space signalized targets in the images. In this paper, the automation of the proposed camera calibration procedure through automatic target extraction and labelling approaches will be presented. The introduced automated system calibration procedure is then implemented for a newly-developed multi-camera system while considering the optimum configuration for the data collection. Experimental results from the implemented system calibration procedure are finally presented to verify the feasibility the proposed automated procedure. Qualitative and quantitative evaluation of the estimated system calibration parameters from two-calibration sessions is also presented to confirm the stability of the cameras' interior orientation and system mounting parameters.

• 대한의용생체공학회:의공학회지
• /
• 제17권4호
• /
• pp.433-442
• /
• 1996

Since one texture property(i.e coarseness, orientation, regularity, granularity) for ultrasound liver ages was not sufficient enough to classify the characteristics of livers, we used multi texture vectors tracted from ultrasound liver images and a statistical classifier. Multi texture vectors are selected among the feature vectors of the normal liver, fat liver and cirrhosis images which have a good separability in those ultrasound liver images. The statistical classifier uses multi texture vectors as input vectors and classifies ultrasound liver images for each multi texture vector by the Bayes decision rule. Then the decision of the liver disease is made by choosing the maximum value from the averages of a posteriori probability for each multi texture vector In our simulation, we obtained higtler correct ratio than that of other methods using single feature vector, for the test set the correct ratio is 94% in the normal liver, 84% in the fat liver and 86% in the cirrhosis liver.

• 한국유통학회지:유통연구
• /
• 제15권3호
• /
• pp.35-69
• /
• 2010

다단계판매 기업은 다수의 판매원 네트워크를 통해 의해 제품이나 서비스를 판매하기 때문에 이들과의 성공적 관계 관리가 기업의 성과와 성장을 결정짓는 핵심요인이다. 본 연구는 다단계판매 기업을 대상으로 상위판매원의 변혁적 리더십이 하위판매원의 기업가적 성향, 시장지향성과 성과에 미치는 영향을 분석하고 있다. 국내 최대 다단계판매 기업의 135명의 하위판매원을 대상으로 한 설문자료의 분석 결과, 상위판매원의 변혁적 리더십은 하위판매원의 기업가적 성향과 시장지향성에 긍정적인 영향을 미치며, 하위판매원의 시장지향성은 하위판매원의 성과에 긍정적인 영향을 미치는 것으로 확인되었다. 상위판매원의 변혁적 리더십은 하위판매원의 기업가적 성향은 높이지만 하위판매원의 성과와 직접적인 관련을 맺지는 않는 것으로 나타났다. 또한 하위판매원의 기업가적 성향은 하위판매원의 시장지향성을 통해 하위판매원의 성과를 높여주는 것으로 나타났다. 본 연구는 다단계판매업에서의 상위판매원의 하위판매원에 대한 변혁적 리더십의 중요성을 확인하고 있으며, 이를 근거로 향후 리더십 관련 연구 및 기업경영과 관련한 시사점을 제시하고 있다.

• 대한전기학회논문지:전기물성ㆍ응용부문C
• /
• 제52권11호
• /
• pp.496-500
• /
• 2003

A low-cost, large area, random, maskless texturing scheme independent of crystal orientation is expected to significantly impact terrestrial photovoltaic technology. We investigated silicon surface microstructures formed by reactive ion etching (RIE) in Multi-Hollow cathode system. Desirable texturing effect has been achieved when radio-frequency (rf) power of about 20 Watt per one hollow cathode glow is applied for our RF Multi-Hollow cathode system. The black silicon etched surface shows almost zero reflectance in the visible region as well as in near IR region. The etched silicon surface is covered by columnar microstructures with diameters from 50 to 100 nm and depth of about 500 nm. We have successfully achieved 11.7% efficiency of mono-crystalline silicon solar cell and 10.2% multi-crystalline silicon solar cell.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2002년도 추계학술대회 논문집
• /
• pp.999-1002
• /
• 2002

Cylindrical Cam Mechanism is widely used in the fields of industries, such as machine tool exchangers, textile machinery. This paper proposes a method for manufacturing of cylindrical cam in Multi CNC machining center. Multi CNC machining center has two different types depending on the tilting axis. For the manufacturing procedures. in this paper the location and the orientation of cutter path are defined from shape design data of cam. The integral NC code fur the both types of multi-axis CNC machining center can be created using the coordinates mapping between design coordinates and work coordinates. Finally, CAD/CAM program is developed on $C^{＋＋}$ language. This program can display manufacturing and kinematics simulation, which can make integral NC code for multi-axis CNC machining center of two types.

• Interaction and multiscale mechanics
• /
• 제4권2호
• /
• pp.155-164
• /
• 2011

The lattice strain evolution within polycrystalline solids is influenced by the crystal orientation and grain interaction. For multi-phase polycrystals, due to potential large differences in properties of each phase, lattice strains are even more strongly influenced by grain interaction compared with single phase polycrystals. In this research, the effects of the grain interaction and crystal orientation on the lattice strain evolution in a two-phase polycrystals are investigated. Duplex steel of austenite and ferrite phases with equal volume fraction is selected for the analysis, of which grain arrangement sensitivity is confirmed in the literature through both experiment and simulation (Hedstr$\ddot{o}$m et al. 2010). Analysis on the grain interaction is performed using the results obtained from the finite element calculation based on the model of restricted slip within crystallographic planes. The dependence of lattice strain on grain interactions as well as crystal orientation is confirmed and motivated the need for more in-depth analysis.

• 복식
• /
• 제65권4호
• /
• pp.45-60
• /
• 2015

Emotional consumption value orientation has played a significant role to have a direct effect on making purchase in our lives. And emotional value has been dealt within the SPA brand contexts recently. Therefore, the current study investigates how SPA brand consumers' emotional value consumption orientation has affected brand loyalty, with a focus on mediation effects of marketing mix attributes assessment. Results of this research are as follows. First, there was a significant difference between Zara and Uniqlo on the assessment of marketing mix attributes. Second, emotional consumption value orientation had significantly impact on brand loyalty for both Zara and Uniqlo. Third, multi-regression analysis was conducted to find out the mediation effect of marketing mix attributes assessment in the relationships between emotional consumption value orientation and brand loyalty. For Zara, hedonic promotional and pricing attributes of products and place show full mediation effect on brand loyalty. For Uniqlo, utilitarian, hedonic and pricing attributes have impact on brand loyalty. The current study strives to find out how emotional consumption value orientation attected the consumer evaluation process and purchase behavior in the contexts of SPA brand product purchase. Product assessments have stronger effect than place, and hedonic attributes have stronger effect on brand loyalty in comparison with utilitarian attributes. Also, hedonic attributes of product and place have stronger effect on brand loyalty in comparison with utilitarian attributes.

• 대한원격탐사학회지
• /
• 제20권2호
• /
• pp.125-137
• /
• 2004

하나의 기선에 작은 여러 영상을 투영하여 하나의 영상 모자이크를 생성하는 2차원 영상 모자이크 기법은 비데오 카메라가 도심지역을 이동하여 얻은 영상을 하나의 모자이크 영상을 생성할 수 없다. 본 논문에서는, 3차원 다중 기준선을 이용함으로서 3차원 공간에서 영상 모자이크를 생성시킬 수 있는 새로운 기법을 제안하였다. 제안된 방법은 각 영상 프레임마다 독립적인 기선을 가지도록 하여 3차원 공간에서 영상 모자이크를 생성 제안하는 것으로서, 독립적인 기선은 각 영상 프레임에서 추출된 광류의 지상 기준점들을 1차 방정식으로 표현한 것이다. 제안한 방법은 계층적 방법을 이용한 광류(Optical Flow)계산, 카메라 외부표정(Exterior Orientation)계산, 다중 기선(Multi-baselines)계산과 모자이크 된 영상들간의 경계를 감지 못하는 화소(Optimal Seamline Detection)의한 영상 모자이크 재생성 과정을 통해 구현되며, 실제 영상 프레임을 이용한 실험을 통해 효과적으로 3차원 공간에서 영상 모자이크 제작이 가능함을 입증하였다.

• 지식경영연구
• /
• 제25권1호
• /
• pp.111-134
• /
• 2024

다양한 업계에서 한 번에 여러 가지 기능을 수행하는 '다목적' 제품을 출시하는 브랜드들이 늘고 있다. 그러나 소비자들이 다목적 제품과 이를 제공하는 브랜드에 대한 인식 관련 연구는 아직 많이 이루어지지 않았다. 본 연구에서는 소비자들이 미(美) 에 대해 갖고 있는 암묵적 이론이 다목적 제품 관련 지식과 브랜드 지식에 미치는 영향을 연구한다. 외모 지향성이 높은 소비자들 사이에서, 미(美)에 대한 증가(vs. 실체) 이론(즉, 본인의 아름다움은 타고난 것이 아닌, 노력에 의해 변화시킬 수 있는 것이라는 믿음)이 강할 수록 다목적 제품에 대한 선호도가 감소한다는 것을 발견하였다. 또한, 이는 전반적인 브랜드 평가에도 부정적인 영향을 미치는 것으로 나타났다. 이 연구 결과는 제품/브랜드 관련 지식경영에 있어, 소비자들의 암묵적 이론과 그에 따른 선호도를 고려해야 한다는 것을 시사한다.