• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권5호
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• pp.2346-2362
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• 2016

As one of the most important issues in computer vision and image processing, online object tracking plays a key role in numerous areas of research and in many real applications. In this study, we present a novel tracking method based on the proposed structured sparse representation model, in which the tracked object is assumed to be sparsely represented by a set of object and background templates. The contributions of this work are threefold. First, the structure information of all the candidate samples is utilized by a joint sparse representation model, where the representation coefficients of these candidates are promoted to share the same sparse patterns. This representation model can be effectively solved by the simultaneous orthogonal matching pursuit method. In addition, we develop a tracking algorithm based on the proposed representation model, a discriminative candidate selection scheme, and a simple model updating method. Finally, we conduct numerous experiments on several challenging video clips to evaluate the proposed tracker in comparison with various state-of-the-art tracking algorithms. Both qualitative and quantitative evaluations on a number of challenging video clips show that our tracker achieves better performance than the other state-of-the-art methods.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권5호
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• pp.2576-2589
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• 2017

Co-saliency detection is a task of detecting same or similar objects in multi-scene, and has been an important preprocessing step for multi-scene image processing. However existing methods lack efficiency to match similar areas from different images. In addition, they are confined to single image detection without a unified framework to calculate co-saliency. In this paper, we propose a novel model called Superpixel Matching-Cellular Automata (SMCA). We use Hausdorff distance adjacent superpixel sets instead of single superpixel since the feature matching accuracy of single superpixel is poor. We further introduce Cellular Automata to exploit the intrinsic relevance of similar regions through interactions with neighbors in multi-scene. Extensive evaluations show that the SMCA model achieves leading performance compared to state-of-the-art methods on both efficiency and accuracy.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2008년도 추계 공동 국제학술대회
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• pp.316-321
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• 2008

In the present emerging global economy, as the focus is shifted from manufacturing to service sector, the efficiency of service operations is crucial for the county's sustainable growth and development. As one of the fastest growing service sector industries in South Korea, the call center has become an inevitable part of customer service for most companies. Despite of the strategic importance of the call center, there has been no empirical study on the efficiency of call center service operations in the literature. The main purpose of this study is to evaluate the technical efficiency of call center services so as to not only identify the current status of call center service operations, but also suggest ways to improve service operations efficiency. For this purpose, we apply a non-parametric efficiency measurement method, DEA (Data Envelopment Analysis), to domestic call centers in order to compare their relative efficiency. Based on DEA evaluations, we provided specific directions for the inefficient call centers to possibly improve their operation efficiencies. It is expected that the measurement methods suggested in this study can be applied to various issues such as service KS certification, service operations management, and the productivity analysis of service personnel.

• 태양에너지
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• 제11권2호
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• pp.29-33
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• 1991

본 연구는 일차원 열 성능 분석 프로그램인 SERI-RES를 이용하여 우리 고유의 난방 방식이라 할 수 있는 Radiant Floor Heating System의 운전 모드(Operation Modes)에 대한 시뮬레이션을 수행하였다. SERI-RES는 원래 공기 가열식 시스템을 주요 난방 방식으로 작성된 프로그램이라 본 연구의 시뮬레이션을 수행하기 위하여 Source Code에 대한 약간의 수정을 가하였다. 얻은 결과를 분석하여 보면 Radiant Floor Heating System은 그 운용 방법(Operation Modes)에 따라 건물의 동적 열 성능에 상당한 영향을 미치는 것으로 나타났으며 이는 Test Cell에 대한 간단한 실측 실험을 통해서도 확인되었다. SERI-RES는 비록 HVAC 시스템등에 대한 구체적인 시뮬레이션은 불가하나, 비록 일차원적이기는 하지만 Radiant Floor Heating 시스템과 건물의 동적 열 성능에 대한 분석에는 상당히 효율적인 Simulation Model을 제공하였다.

• 설비공학논문집
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• 제21권6호
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• pp.333-339
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• 2009

The objective of this study is to predict optimal intermediate pressure of a 2-stage compression heat pump system using river water. To determine the maximum performance of the 2-stage compression heat pump system, the experimental evaluations on the 2-stage compression cycle were carried out under various operating conditions. Electronic expansion valves were applied to control intermediate pressure and superheat. Based on the experimental data, an empirical correlation for predicting optimal intermediate pressure which considering cycle operating parameters was developed. The present correlation was verified by comparing the predicted data with the measured data. The predictions showed a good agreement with the measured data within a relative deviation of ${\pm}4%$ at various operating conditions.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1209-1212
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• 2008

동력분산형 고속전철은 분산된 EMI 발생원(source)을 가지도록 제작되기 때문에, 분산된 전자계 감수품(感受品, victim) 가까이에서 기존의 동력집중형 시스템보다 전자계 발생원을 더 많이 가지고 있다. 이 연구에서는, 전자계 발생원들과 전자계 감수품들을 확인하고, 고속전철 시스템의 안전 운행을 위하여 EMI/EMS/EMC를 취급하는 방법을 개발한다. 개발되는 내용은, 고속전철의 전자파 장해 방지 측정과 기준연구, 제어용 부품 등에 대한 EMI/EMS 기준 수립, 그리고 시제품에 대한 EMI/EMC 시험 및 평가이다. 또한 최신 무선 통신 장비에 의한 영향과 PLD(전원선 교란)에 의한 효과도 이 연구에서 조사될 것이다.

• Corrosion Science and Technology
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• 제5권1호
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• pp.33-38
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• 2006

Current coating practice requires the thickness of anti-corrosion organic coatings to be over $250{\mu}m$ for immersion parts of ships and offshore structures and the corrosion resistance of these coatings has been evaluated by destructive and qualitative analysis. Recently, Electrochemical Impedance Spectroscopy(EIS) method has been employed, as an alternative, to evaluate corrosion resistance of organic coatings. This method is characterized as being nondestructive, reproducible, and quantitative in evaluating aging of organic coatings. In this study, EIS method was adopted to quantitatively and effectively select the coating systems having optimized protective performance. Evaluations of several epoxy and epoxy/polyurethane coating systems typically used for ships and offshore structures were carried out in wet($50^{\circ}C$, $90^{\circ}C$) and dry(room temp.) environments to accelerate the degradation of the organic coatings. These results were compared with the conventional scribed(scratched) test results. The plausible prediction model for determining the remaining life-time of coating systems was also proposed based on variations of impedance data, FT-IR and $T_g$ measurements results.

• 디지털콘텐츠학회 논문지
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• 제19권7호
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• pp.1373-1379
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• 2018

센서를 활용한 다양한 응용들의 등장으로 사물 인터넷 환경에서 무선 센서 기기들의 활용범위가 점점 넓어지고 있다. 그런데 무선 센서 특성상 전력자원의 한계가 있으므로, 무선 통신과 같이 전력소모가 큰 작업들을 에너지 효율적으로 운영해야 한다. 이를 위해, 본 논문에서는 수집된 센서 데이터를 모아서 전송하는 방식(data aggregation) 하에서 확률 모형 기반의 에너지 소비 모델을 개발하고, 개발된 모델을 기반으로 전력소비를 최소화하는 센서 데이터 전송주기를 구하였다. 또한, 분석 결과를 바탕으로 최적 전송주기의 성능을 수치예제로 보였다.

• 한국콘텐츠학회논문지
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• 제16권12호
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• pp.551-561
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• 2016

소셜 네트워크에서 발생하는 방대한 데이터를 이용해 사용자 영향력을 판별하기 위한 기법이 요구되고 있다. 본 논문에서는 소셜 네트워크에서 신뢰성을 고려한 사용자 영향력 판별 기법을 제안한다. 제안하는 기법은 사용자의 소셜 행위를 통해 신뢰성 점수를 측정하고 신뢰할 수 있는 사용자들만을 모아 네트워크를 간소화한다. 또한, 사용자간의 연결정도에 따라 직-간접적인 영향력을 반영하여 사용자 영향력을 도출한다. 이를 통해 사용자 영향력 판별함으로써 사용자 영향력의 확산성을 향상시킨다. 제안하는 기법의 우수성을 보이기 위해 제안하는 기법과 기존 기법을 신뢰성과 사용자 영향력 확산성 측면에서 성능평가를 수행한다.

• 한국초등과학교육학회지:초등과학교육
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• 제23권2호
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• pp.93-100
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• 2004

To get an appropriate and meaningful performance assessment outcomes and to provide the base of essential elementary educational evaluations, we had tried to establish achievement standards, assessment standards and had developed appropriate assessment tools in 「Intelligent Life」 course of the elementary school in this study. The following things were taken into account to establish achievement standards, assessment standards and to develop assessment tools. First, managing deeply not only cognitive domain but also the basic inquiry skills and affective domain, all-round educational properties of integrated courses were likely to come out. Second, evaluating instructional processes as well as instructional results, we had developed assessment standards in elementary 2nd grade's 「Intelligent Life」 course. Third, developing assessment standards on the basis of the 7th Curriculum, we had examined both text book and teacher's guide to promote effectiveness of field application. The type of an assessment tools had been developed variously, considering the characteristics of the elementary lower grades and properties of elementary 2nd grade's 「Intelligent Life」 course. We had developed assessment tools to observe and evaluate practical achievement levels, placing great importance on the types of an assessment tools including observing, narrative of inquiry, report, etc. As a result of investigation of elementary teachers' understandings of the developed achievement standards, assessment standards, and an assessment tools, were revealed in the affirmative on the whole.