• 대한기계학회논문집A
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• 제23권11호
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• pp.1929-1939
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• 1999

This paper presents a neural network approach, which was named PRONET, to 3D object recognition and pose calculation. 3D objects are represented using a set of centroidal profile patterns that describe the boundary of the 2D views taken from evenly distributed view points. PRONET consists of the training stage and the execution stage. In the training stage, a three-layer feed-forward neural network is trained with the centroidal profile patterns using an error back-propagation method. In the execution stage, by matching a centroidal profile pattern of the given image with the best fitting centroidal profile pattern using the neural network, the identity and approximate orientation of the real object, such as a workpiece in arbitrary pose, are obtained. In the matching procedure, line-to-line correspondence between image features and 3D CAD features are also obtained. An iterative model posing method then calculates the more exact pose of the object based on initial orientation and correspondence.

• 한국언론정보학보
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• 제30권
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• pp.143-174
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• 2005

매체 기술의 발달에 따라 뉴스전달의 흐름이 일방향에서 쌍방향으로, 뉴스 수용자가 적극적인 이용자로 새로이 자리매김 해가는 추세다. 이러한 상황 인식을 바탕으로 본 연구는 온라인 뉴스 제공자로서의 포털 뉴스 사이트와 뉴스 소비자로서의 네티즌이 상호 어떤 인식을 갖고 있는지 탐구하는 데에 그 목적을 두었다. 이를 위해 포털 뉴스의 매체적인 특성을 쌍방향상으로 인한 적극적 이용자 부상, 뉴스 제공자와 시민기자로의 확장, 선택권의 확대(이용자 특성), 컨텐츠 업데이트, 컨텐츠 분량의 무제한성, 하이퍼텍스트성, 컨텐츠 보존성, 멀티미디어 컨텐츠 제공(컨텐츠 특성) 등 8가지를 추출하고 그에 대한 이용자와 사용자간 상호인식을 채피와 맥리오드의 상호지향성 모형을 적용해 알아보았다. 연구결과 이용자 특성에 관한 문항은 부분 일치로, 서로 일치하는 인식에 대해 이용자들이 오해를 하고 있었던 반면, 컨텐츠 특성 항목에서는 대부분의 문항에서 제공자가 더 긍정적인 인식을 갖고 있는 것으로 나타났다. 이는 포털을 통한 뉴스전달방식에 대해 제공자와 이용자가 아직 상호 지향되지 않고 있으며, 이는 새로운 매체실험에 따른 역동성의 결과로서 향후 상호지향을 위한 커뮤니케이션의 증대를 시사한다.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2003년도 추계학술발표회 논문집
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• pp.147-152
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• 2003

Aerial Images are usually used to extract 3-D coordinates of various urban features. In this process, the stereo matching of images should be performed precisely to extract these information from aerial Images. In this research, we proposed a matching technique based on geometric features of lanes. We extracted lanes from aerial images and grouped into 4 lane's types. They are lane lines, dotted lines, arrow lane, safety zone. After preprocessing, We will match them by spatial relationships, for example, the distance and orientation between the extracted features. In the future, we will obtain lane coordinates and reconstruct 3-d coordinates of roads.

• KIEAE Journal
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• 제3권4호
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• pp.15-22
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• 2003

Open housing is an emerging, new concept in housing development that combines demand-orientation with environment-friendliness. Its methodology, however, has not been analyzed in a systematic way. In this study, the features of planning method in open housing were analyzed to systematize types of the planning method. The existing planning methods of open housing was reviewed and they can be classified into three approaches such as pattern, module and organization planning. Given three approaches, the existing planning methods of open housing can be sub-classified as follows; free and patterned planning by patterns, modular and non-modular planning by modules, and hierarchical and non-hierarchial planning by organizations. The framework for the typological analysis was made based on the classification and a composite typological system was drawn from the analysis of the existing planning features. The suggested classification of features in open housing is expected to contribute to the clear definition of characteristics on open housing to provide a basis for the concrete realization method, to analyzing problems with the existing planning methods and to providing their solutions.

• 치과방사선
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• 제27권1호
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• pp.17-24
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• 1997

The purpose of the present study was to use digital profile image features and digital image analysis of fixed-dimension bone regions, extracted from standardized periapical radiographs of the maxilla, to determine whether differences exist in alveolar bone of younger women(mean age: 59.23±7.34 years) and just menopaused women(mean age: 59.23±7.34). Periapical films were used from two groups of 20 randomly selected women. None of the subjects had a remarkable medical history. To simplify protocol, we chose one interproximal bone area between the maxillary right canine and lateral incisor for study. Ech film was digitized into a 1312 x 1024 pixel x 8 bit depth matrix by means of a Nikon 35 mm film scanner(LS-35lOAF, Japan) with fixed gain and internal dark current correction to maintain constant illumination. The scanner was interfaced to a Macintosh LC III computer(Apple Computer, Charlotte, N.C.). Area and profile orientation were selected with a NIMH Image 1.37(NIH Research Services Branch, Bethesda, Md.). Histogram features were extracted from each profile and area. The results of this study indicate that mean pixel intensities didn't differ significantly between two groups and there was a high correlarion-coefficient between digitized radiographic profile features and area features.

• 산업경영시스템학회지
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• 제40권2호
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• pp.145-149
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• 2017

One of the challenges facing precision manufacturers is the increasing feature complexity of tight tolerance parts. All engineering drawings must account for the size, form, orientation, and location of all features to ensure manufacturability, measurability, and design intent. Geometric controls per ASME Y14.5 are typically applied to specify dimensional tolerances on engineering drawings and define size, form, orientation, and location of features. Many engineering drawings lack the necessary geometric dimensioning and tolerancing to allow for timely and accurate inspection and verification. Plus-minus tolerancing is typically ambiguous and requires extra time by engineering, programming, machining, and inspection functions to debate and agree on a single conclusion. Complex geometry can result in long inspection and verification times and put even the most sophisticated measurement equipment and processes to the test. In addition, design, manufacturing and quality engineers are often frustrated by communication errors over these features. However, an approach called profile tolerancing offers optimal definition of design intent by explicitly defining uniform boundaries around the physical geometry. It is an efficient and effective method for measurement and quality control. There are several advantages for product designers who use position and profile tolerancing instead of linear dimensioning. When design intent is conveyed unambiguously, manufacturers don't have to field multiple question from suppliers as they design and build a process for manufacturing and inspection. Profile tolerancing, when it is applied correctly, provides manufacturing and inspection functions with unambiguously defined tolerancing. Those data are manufacturable and measurable. Customers can see cost and lead time reductions with parts that consistently meet the design intent. Components can function properly-eliminating costly rework, redesign, and missed market opportunities. However a supplier that is poised to embrace profile tolerancing will no doubt run into resistance from those who would prefer the way things have always been done. It is not just internal naysayers, but also suppliers that might fight the change. In addition, the investment for suppliers can be steep in terms of training, equipment, and software.

• 대한전자공학회논문지SP
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• 제46권5호
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• pp.48-55
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• 2009

실내외 영상 분류에 대한 연구는 밝기나 에지 정보와 같이 하위 레벨(low-level) 정보의 단순 결합을 이용하여 수행되어 왔다. 그러나 기존의 하위 레벨 영상 정보만을 기반으로 하는 실내외 영상 분류 방법은 다양한 콘텐츠를 극복하는데 한차가 군기 때문에 상위 레벨(high-level) 영상 정보를 함께 이용하는 방법에 대한 연구가 많이 진행되어 왔다. 이러한 연구의 대부분은 영상 내 하늘이나 수풀과 같은 영역을 검출하기 위해 별도의 알고리즘을 수행하기 때문에 특징 벡터의 차원을 증가시키거나 수행 속도를 저하시키는 문제점이 있다. 따라서 본 논문에서는 이러한 문제점을 극복하기 위해 효율적인 실내외 영상 분류 기법을 제안한다. 먼저 효과적인 특징 벡터를 생성하기 위해 영상을 5개의 하위 블록으로 나눈다. 각각의 블록에 대하여, 제안하는 에지 색상 방향 히스토그램(edge and color orientation histogram, ECOH) 기술사(descriptor)를 이용하여 해당 블록을 표현하고 모든 블록의 값을 연결하여 최종적으로 특징 벡터를 생성한다. 제안하는 알고리즘의 효율성과 강건함을 보이기 위해 1200개 이상의 다양한 실내외 영상을 사용하였으며, 학습을 통해 각 영역의 가중치를 결정하여 분류 성능을 향상 시켰다.

• 대한기계학회논문집A
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• 제33권3호
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• pp.251-260
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• 2009

Hybrid locomotive UGV with actively articulated legs along with wheeled ends has high traversability to travel over rough terrain. The behavior control method was usually adapted for the controlling of the suspension configuration which determines the traversability of the UGV. In this study, we are proposing a method of configuration planning of the legs without any detail geometric data about the terrain. The terrain was estimated by the traces of each wheel and the leg configurations for the desired posture of the vehicle were set up against the constraints of the terrain. Also, an optimal leg configuration was calculated based on the quasi-static stability and power consumption, and plans for the leg behavior were made. Validity of the proposed method was checked by simulations using some off-the-shelf programs, and showed that the orientation control without geometric features of terrains and simplification of the behavior planning for obstacle negotiation were possible.

• 아태비즈니스연구
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• 제15권1호
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• pp.45-69
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• 2024

Purpose - To examine the influence of mobile visual search as a strategic technology service on consumer perceived economic value and customer commitments, which in turn affect consumer's usage intention of mobile visual search. This study also explores the moderating effect of different levels of consumer online shopping orientation. Design/methodology/approach - One-by-one open-ended in-depth interview was first undertaken to 15 Korean consumers to figure the features of mobile visual search. Then a conceptual model was built to verify the hypotheses that indicate the impact of mobile visual search on consumer perceived economic value and customer commitment, which further influence consumer's usage intention. Findings - The results show Convenience, Information quality, Personalization, Text-free search interface design and Visual communication of mobile visual search positively influence consumer perceived economic value and customer commitment and in turn positively affect consumer's usage intention. Moreover, the different levels of consumer online shopping orientation also found to have different effects on consumers' perception and behavior of using mobile visual search in online fashion shopping. Research implications or Originality - The present study verified that mobile visual search is a service tool that consumers want to use in the online fashion shopping journey since it provides economic benefits.

• 한국멀티미디어학회논문지
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• 제19권5호
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• pp.865-873
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• 2016

In recent years, Tracking-Learning-Detection(TLD) system has been widely used as a detection and tracking algorithm for vision sensors. While conventional algorithms are vulnerable to occlusion, and changes in illumination and appearances, TLD system is capable of robust tracking by conducting tracking, detection, and learning in real time. However, the detection and tracking algorithms of TLD system utilize rotation-variant features, and the margin of tracking error becomes greater when an object makes a full out-of-plane rotation. Thus, we propose a rotation-invariant TLD system(RI-TLD). we propose a simplified average orientation histogram and rotation matrix for a rotation inference algorithm. Experimental results with various tracking tests demonstrate the robustness and efficiency of the proposed system.