• The Bulletin of The Korean Astronomical Society
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• v.36 no.2
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• pp.133.1-133.1
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• 2011

태양풍이 지구 전파통신에 미치는 영향을 예측하고 대응하기 위해 전파연구소와 협력하여 태양풍의 운동을 모니터할 수 있는 시스템을 개발하고 있다. 태양풍이 일으키는 섬광(scintillation)에 의해 태양풍 배후에 있는 전파원 밝기가 변하는 것을 측정하여 역으로 태양풍의 이동속도, 전자밀도 등을 유도하는 원리를 이용한다. 포물면형의 전파망원경 대신 시야가 넓은 다이폴 안테나를 24개 단위로 묶은 타일 32개를 동서-남북으로 수백미터 넓이의 부지에 배열하고 전자빔조향으로 원하는 천체를 추적한다. 타일은 수동으로 남북방향으로 움직일 수 있어 계절별로 태양근처의 전파원을 잘 볼 수 있도록 하였다. 각 타일에서 나온 신호는 약 10MHz의 대역폭으로 디지털화되어 컴퓨터에 기록되고 실시간에 가깝게 각 타일간의 천체 위치별 위상차를 보정한 후 합성되어 전파원의 세기를 측정한다. 이 신호들을 교차상관시키면 야간에는 천문용 간섭계로도 사용할 수 있다. 기본적으로는 MWA를 참고해서 설계한 것이나, 동작을 입증하기 위해서 타일 3개로 이루어진 시제품도 제작하였다. 현재 각 부분별로 제작이 진행되고 있으며 하드웨어는 올해 말까지 완성될 것이다.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.482-486
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• 2009

Conventional music players offer simple replay and one way entertainment. The paper presents an algorithm to extract, within a digitally recorded music file, the temporal information of a sequence of target notes (i.e. melody). We assume to have the score (e.g. MIDI or printed score), and using this information, it becomes possible to first sequentially predict the probable location of the target notes. However, recorded music is hardly performed according to the score, especially temporally. Thus, additional analysis is carried out to hone in on the exact location of the target note from the initially predicted location. This prediction and correction process is repeated to find one note after another. This allows us to develop an interactive music player that is enacted by rhythmic interaction, and induce a new user experience, i.e. as if one is playing the music oneself.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.259-260
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• 2020

기존의 전동휠체어를 사용하는 약자 또는 중증 장애인 등 지체(肢體)가 불편한 사람들이 휠체어 사용 시 생기는 문제점을 해소할 목적으로 시작되었다. 이는 전동휠체어가 보행 기구임에도 자동차에 준하는 교통사고에 대해 무방비하게 노출되고, 중증 장애인에 대한 이동권 보장이 아직 미흡하여 생기는 문제이다. 따라서 본 연구에서는 이러한 문제로 인한 불편함을 해소하고자 아이트래킹을 이용한 스마트 전동휠체어 기술을 적용하고자 한다. 루게릭병 등으로 인해 지체(肢體)의 움직임에 제한이 있는 사람들에게 보호자가 밀어주는 휠체어에 의존하는 것이 아닌 Eye-Tracker를 이용한 시선 추적(Eye-Tracking) 기술로 휠체어 동작이 가능하다. Web-Cam과 라즈베리 파이를 통해 얻은 전·후·좌·우의 영상정보를 디스플레이 화면에 송출한다. 그 후 Eye-Tracking 기술을 이용해 디스플레이 화면에 표시된 전·후·좌·우 이동에 관한 UI(User Interface)룰 사용자가 송출된 영상을 보면서 눈의 움직임만으로 선택해 휠체어의 방향을 제어한다. 또한 전동휠체어의 조작 실수로 다른 행인 또는 장애물과 충돌하는 문제점을 초음파 센서를 이용하여 일정 거리 내에 사물이나 사람이 있을 경우 디스플레이 화면에 경고표시 및 경고음, 각 초음파 센서 위치에 맞는 LED작동으로 사용자들에게 추돌 위험경고와 함께 장애물의 위치파악이 가능하도록 한다. 따라서 스마트 전동휠체어를 통하여 수동적인 움직임이 아닌 능동적이고, 초음파 센서로 인해 안전한 이동이 가능하게 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.18-20
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• 2021

In order to prevent collision accidents of ships, which has been increasing recently, research on artificial intelligence-based autonomously operated ships (Maritime Autonomous Surface Ship, MASS) is underway. However, most of the studies related to autonomous ships mainly target medium-to-large ships due to the size and cost of the autonomous navigation system, and the sensors used here have a problem in that it is difficult to mount them on small ships. Therefore, this paper provides a path tracking system equipped with GPS and IMU sensors for autonomous operation of small ships. GPS and IMU sensors are utilized to determine the exact position of the vessel, which allows the proposed system to manually control the small vessel model to create a path and then when the small vessel travels the same path. Use the Pure Pursuit algorithm to follow the path. As a result, In this research, it is expected that a lightweight and low-cost sensor can be used to develop an autonomous operation system for small ships at low cost.

• The KIPS Transactions:PartC
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• v.10C no.7
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• pp.867-878
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• 2003

In thls Paper, we Propose a new scheme, protecting information about the location of a mobile user against attacks from inside users of the mobile communication, especially the network providers. There have already been some proposals about how to protect location information of user in mobile communication environments〔1-5〕. Among them, Kesdogan et al.〔2, 3〕 proposed a new method, using so-called temporary pseudonyms and also described protection method against a passive and an active attack of network providers. However, the description of protection method against the active attack between the two is not clear. Moreover, there is an additional load that it should append a reachability manager〔1, 6〕 to the proposed system. Therefore, we propose a new scheme improving the above method of Kesdogan et al. and analyze its security and effectiveness.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.16 no.1
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• pp.33-42
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• 1994

Obwegeser II method and Rigid fixation conserving the condylar position has been performed on 5 patients with severe mandibular prognathism, and we obtained the result after the follow up study follows. 1. Obwegeser II method is considered to move the distal segment passively when surgical correction of severe open bite correction and large amount of set back above 15mm is needed. 2. In one case that has more change of condylar position after operation, documented immediate post-operative relapse have been occurred 3. In the others that have adequate control of condylar position, passive set back and firm skeletal fixation, more functional and esthetic improvement and more post-operative stability has been achieved

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.369-374
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• 2008

음악 연구에 따른 컴퓨터의 역할이 점자 중요한 비중을 차지함에 따라 보다 효과적인 악보 인식과 효율적인 악보의 편집 및 수정 방법이 요구된다. 기존의 수동 입력 방식에서는 악보를 부정확하게 입력하여 수정하는 경우에는 작업 시간이 많이 소요되며, 각 수정 프로그램에서 만든 악보는 특정 프로그램에서만 재수정이 가능하다는 단점이 있다. 본 논문에서는 이러한 단점을 보완하기 위하여 이미 작성 되어있는 악보들을 자동으로 인식하는 방법을 제안한다. 제안된 악보 인식 방법은 수평 히스토그램을 이용하여 악보 이미지의 오선을 제거한 후, 4방향 윤곽선 추적 알고리즘을 적용하여 잡음을 제거하고 Grassfire 알고리즘을 적용하여 악보 구성 기호들을 추출한다. 추출된 악보 구성 기호들은 Hierarchical ART2 알고리즘을 적용하여 인식한다. 인식된 악보구성 기초들을 이용하여 악보 구성 기호들이 속하는 마디의 위치 정보를 각각 저장하고 향후에 악보 구성 기호의 편집과 수정이 용이하게 한다. 제안된 악보 인식 방법의 성능을 평가하기 위해 100장의 악보 영상을 대상으로 실험한 결과, 제시된 Hierarchical ART2 알고리즘을 이용한 악보 영상의 인식 방법이 실험을 통해서 효율적인 것을 확인하였다.

• Journal of the Society of Disaster Information
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• v.17 no.4
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• pp.802-816
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• 2021

Purpose: In this paper, we propose a direction of future research and development to be carried out in the passive tracking field by deriving a white space with enhanced search formula of patent analysis. Method: In this paper, we derive a white space by identifying the direction and the flow of technology change and by matrixing the object and solution through extensive patent search with enhanced search formula and analysis in the field of passive tracking technology. Result: By the proposed scheme, 'multi-target positioning and tracking' and '3D positioning technology' using artificial intelligence, adaptive/hybrid positioning technology, and radar/antenna were derived as white space technologies and confirmed with absence of any services or products. Conclusion: The derived white space technologies from this paper are the areas where patent applications are not active and there are not many prior patents, thus it is necessary to secure the rights through more active R&D and patent application activities.

• Journal of Korean Society of Steel Construction
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• v.21 no.4
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• pp.413-420
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• 2009

Heavy structures such as large roof structures and superbeams were lifted using hydraulic jacks. Moreover, member verticality and horizontality checks were performed at every construction stage to monitor the measuring tapes for their structural safety, using CCTV. When the relative displacement exceeded the predetermined limit, the hydraulic systems were terminated. After adjusting the relative displacement manually, lifting was resumed. The accuracy of the relative displacement was found not to be reliable, however, due to eye check using CCTV, and it took a long time due to manual adjustment. Moreover, real-time monitoring was impossible. To address these problems, the monitoring-evaluation system for the stable lifting of heavy structures was proposed, using the total station of the automatic-target-recognition type, laser-distance-measuring devices, a data logger, a strain gauge, and others. After developing a program for the operation of the system and for the acquisition of data, a mock-up test was conducted in a large-scale structural laboratory to evaluate the accuracy and applicability of the system. The stable acquisition and applicability of data was confirmed in the test.

• KEPCO Journal on Electric Power and Energy
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• v.5 no.3
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• pp.149-156
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• 2019

In the field of maintenance of power transmission lines, drones have been used for their patrol and inspection by KEPCO since 2017. This drone technology was originally developed by KEPCO Research Institute, and now workers from four regional offices of KEPCO have directly applied this technology to the drone patrol and inspection tasks. In the drone inspection system, a drone with an optical zooming camera and a thermal camera can fly automatically along the transmission lines by the ground control system developed by KEPCO Research Institute, but its camera gimbal has been remotely controlled by a field worker. Especially the drone patrol and inspection has been mainly applied for the transmission lines in the inaccessible areas such as regions with river-crossings, sea-crossings and mountains. There are often communication disruptions between the drone and its remote controller in such extreme fields of mountain areas with many barriers. This problem may cause the camera gimbal be out of control, even though the inspection drone flies along the flight path well. In addition, interference with the reception of real-time transmitted videos makes the field worker unable to operate it. To solve these problems, we have developed the auto-tracking camera gimbal system with deep learning method. The camera gimbal can track the transmission line automatically, even when the transmitted video on a remote controller is intermittently unavailable. To show the effectiveness of our camera gimbal system, its field test results will be presented in this paper.