• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.25 no.5
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• pp.427-436
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• 2007

Because the slope made up the construction of any other facilities, has many risks of a collapse, existing inspection methods to collect information for a construction site of slope bring up a long time of inspection period, cost and approach for a measuring instrument and it presents the critical point of collecting materials. For getting images to use zoom lens in any positions this study will use free zoomer constructed values of data classified by the focal length develop Image Loader system to make it load not only camera information but also camera test data values of the focal length took a photograph automatically if it measure to use a variety of cameras or other lens. Also, as it constructs three dimensions spatial image information from images of obtained objects this study presents effective basic materials of slope surveying and inspection and it shows exact surveying methods for dangerous slope not to access.

• Journal of Broadcast Engineering
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• v.28 no.1
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• pp.31-41
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• 2023

Directly converting the focal depth and image size of computer-generated-hologram (CGH), which is obtained by calculating the interference pattern of light from the 3D image, is known to be quite difficult because of the less similarity between the CGH and the original image. This paper proposes a method for separately converting the each of focal length of the given CGH, which is composed of multi-depth images. Firstly, the proposed technique converts the 3D image reproduced from the CGH into a Light-Field (LF) image composed of a set of 2D images observed from various angles, and the positions of the moving objects for each observed views are checked using an object detection algorithm YOLOv5 (You-Only-Look-Once-version-5). After that, by adjusting the positions of objects, the depth-transformed LF image and CGH are generated. Numerical simulations and experimental results show that the proposed technique can change the focal length within a range of about 3 cm without significant loss of the image quality when applied to the image which have original depth of 10 cm, with a spatial light modulator which has a pixel size of 3.6 ㎛ and a resolution of 3840⨯2160.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.12C
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• pp.1239-1249
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• 2003

Gaze detection is to locate the position on a monitor screen where a user is looking by computer vision. Previous gaze detection system uses a wide view camera, which can capture the whole face of user. However, the image resolution is too low with such a camera and the fine movements of user's eye cannot be exactly detected. So, we implement the gaze detection system with a wide view camera and a narrow view camera. In order to detect the position of user's eye changed by facial movements, the narrow view camera has the functionalities of auto focusing and auto pan/tilt based on the detected 3D facial feature positions. As experimental results, we can obtain the facial and eye gaze position on a monitor and the gaze position accuracy between the computed positions and the real ones is about 3.1 cm of RMS error in case of Permitting facial movements and 3.57 cm in case of permitting facial and eye movement. The processing time is so short as to be implemented in real-time system(below 30 msec in Pentium -IV 1.8 GHz)

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.44 no.12
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• pp.44-53
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• 2007

In this paper, we focus on the developments of complex location awareness algorithms for real-time location based service and precise/stable localization in the outdoor. In the case of using galileo satellite system along with GPS, several error factor such as the ionosphere can be reduced for an increment of used frequency and visible satellites. Therefore, localization estimation error is no longer having problems with location awareness. But, chips synchronization error induces the error of acquisition and tracking, and the performance of receiver can be decreased. In order to solve this problem, this paper proposes a correlator for performance improvement of receiver in the precise localization.

• The Transactions of the Korean Institute of Power Electronics
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• v.10 no.5
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• pp.488-493
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• 2005

This paper presents a method of detecting rotor position for single phase Switched Reluctance Motors(SRMs) using a search coil. In the single phase SRM, mainly Hall effect sensors or photo interrupters have been used to detect the rotor position. But these sensors have many disadvantages. In this paper, low cost and robust characteristics of rotor position detection method are focused in order to compensate for disadvantage of existing sensors. Search coils wound around the stator pole are used for detection of the rotor position in single phase SRM. Rotor position detection is achieved through electromotive force patterns induced by time-varying flux linkage in the search coil. The simulation and experimental results are presented to verify the performance of the proposed method in this paper.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.802-804
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• 2017

Nowadays the development of mobile systems occupies significant part of our life, and users using mobile phones are demanding the utilization of differentiated spatial information. A study on application which provides information according to individual location information such as mobile advertisement is conducted for the location-based mobile service. In order to allow mobile phone users to share information based on local information, this paper proposes a mobile sharing system which combines social networks and location-based service to provide efficient information based on location information in mobile phones. The application can be provided with information associated with its location when the mobile phone user arrives at a specific location. Another proposed method focuses on providing more appropriate services for individual situations compared to other applications, and can contribute to expanding social networking functions to facilitate information sharing among users.

• Proceedings of the Korean Society for Information Management Conference
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• 2002.08a
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• pp.69-74
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• 2002

오늘날 인터넷과 정보기술의 발전은 정보입수 채널을 다양화시킴에 따라 과거 대학도서관이 누렸던 대학 내 정보제공자로서의 독점적 위치를 상실하도록 만들었다. 이러한 새로운 환경은 대학도서관의 역할에 있어서 새로운 패러다임을 요구하게 되었다. 따라서 대학도서관은 도서관을 둘러싼 모든 환경의 변화를 감지하고 그에 대처하는 능력을 갖출 필요가 있다. 이에 본 연구에서는 Sense Making, Knowledge Creation, Decision Making, Holistic 등 경쟁정보(Competitive Intelligence) 관점에서의 정보 이용형태에 초점을 맞추어 대학도서관을 분석하고, 그에 따라 새로운 모델을 제시하고자 한다.

• JOURNAL OF ELECTRICAL WORLD
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• no.9 s.93
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• pp.84-91
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• 1984

전기에너지를 기기동력으로 변환하여 자유자재로 제어함으로써 정밀한 기기량(위치, 속도, 력) 으로 변환시키는 역할이 모우터이다. 최근 HA, OA, FA 분야는 여러 가지의 제어용모우너(이하 서어보모우터라고함)의 용도가 확대되면서 다양화된 제품개발, 기술개발이 활발하게 이루어지고 있다. 소형서어보모우터의 정의는 명확하지 않으나 통계에 따르면 최근 수년 생산량은 매년 $30{\%}$이상으로 증가했다. 소형서어보의 특징으로서는 (1)마이크로프로세서, 전용LSI를 사용하여 디지털콘트로울러에 의한 고정도화, 고기능화 (2)제어용 모우터의 AC화에 의한 멘터넌스플리이와 고속화 (3)들라이브용 센서이 고성능화 등이 있다. 여기서는 산업용을 대상으로한 서어보모우터의 제어에 초점을 두어 최근의 동향에 대해 개설하기로 한다.

• Proceedings of the Korea Multimedia Society Conference
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• 2003.11a
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• pp.314-317
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• 2003

지문을 이용한 개인 인증 절차는 지문 형태 별로 구분하는 분류(classification) 과정과 본인임을 확인하는 정합(matching) 과정으로 구분할 수 있다. 지문의 분류와 정합을 위해서는 기존 연구들이 지문의 특징점 수와 방향성의 흐름 패턴에 의존한다. 본 논문에서는 방향성의 흐름 패턴을 이용한 중심점 추출에 초점이 맞춰져 있으며 추출된 중심점 정보는 현재 구현되어진 특징점 추출 정보와 연계해 정합을 위한 기준점으로 활용한다. 기준점을 축으로 생성되어진 직교좌표는 지문 영상의 상ㆍ하, 좌ㆍ우 위치 이동에 대한 영향을 최소화 시켜줌으로써 지문 정합의 정확도를 높여준다.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2003.11a
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• pp.40-47
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• 2003

GIS는 공간과 관련된 문제를 해결하는데 있어 좋은 도구가 되며 도시성장 예측과 같은 문제에 사용될 수 있다. 본 연구에서는 수도권 내에 위치한 수원지역을 대상으로 1960년대부터 1990년대까지의 도시성장에 관한 데이터베이스를 구축하고 도시의 물리적인 확산에 초점을 맞추어 모형의 핵심이 되는 공간 연관규칙을 추출하였다. 공간 연관규칙의 추출을 위해 GIS 공간 분석 기능과 데이터마이닝 기법을 이용하였으며, 규칙을 기반으로 모형을 작성하여 도시성장을 분석 및 예측하고 UGM(Urban Growth Model)과 비교하였다.