• 한국멀티미디어학회논문지
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• 제10권10호
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• pp.1328-1337
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• 2007

본 논문에서는 P2P 네트워크에서 피어들 간에 멀티미디어 콘텐츠의 특정 구간을 구간정보를 이용하여 효율적으로 스트리밍 하는 방법에 대하여 논한다. 피어들은 콘텐츠의 관심 있는 부분만을 쉽고 편리하게 추출하려는 경향이 있기 때문에 멀티미디어 콘텐츠에서 구간정보를 색인한 파일을 만들어 검색서버에 등록한 후 피어들의 요청이 있을 때 이 구간정보를 이용하여 필요한 부분만을 스트리밍 서비스할 수 있도록 한다. 이를 위하여 피어의 PC가 필요에 따라 서버 기능을 할 수 있도록 기능을 구현하고, 검색서버에서 제공되는 구간정보에 따라 해당하는 피어가 구간별로 콘텐츠를 스트리밍 한다. 본 논문에서 제안한 스트리밍 방식의 평가는 스트리밍 요청 후 재생되는 시점까지의 최초전송지연시간에 초점을 맞추었으며, 동일 조건에서 기존의 스트리밍 방식과 비교하여 낮은 수치를 보여주고 있다.

• 한국군사과학기술학회지
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• 제26권1호
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• pp.31-43
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• 2023

In this paper, we propose a method for generating a global path for an unmanned vehicle using public data of road section information. First, the method of analyzing road section information of the Ministry of Land, Infrastructure and Transport is presented. Second, we propose a method of preprocessing the acquired road section information and processing it into meaningful data that can be used for global routes. Third, we present a method for generating a global path using the preprocessed road section information. The proposed method has proven its effectiveness through actual autonomous driving experiments of unmanned ground vehicles.

• Journal of Information Processing Systems
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• 제7권4호
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• pp.561-580
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• 2011

This paper describes different aspects of a typical RFID implementation. Section 1 provides a brief overview of the concept of Automatic Identification and compares the use of different technologies while Section 2 describes the basic components of a typical RFID system. Section 3 and Section 4 deal with the detailed specifications of RFID transponders and RFID interrogators respectively. Section 5 highlights different RFID standards and protocols and Section 6 enumerates the wide variety of applications where RFID systems are known to have made a positive improvement. Section 7 deals with privacy issues concerning the use of RFIDs and Section 8 describes common RFID system vulnerabilities. Section 9 covers a variety of RFID security issues, followed by a detailed listing of countermeasures and precautions in Section 10.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2023년도 추계학술발표대회
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• pp.446-448
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• 2023

최근 문화유산 해설 분야에도 AI를 도입하기 위해 여러 노력을 기울이고 있으나, 관람객의 특성이나 관심사를 고려하지 않고 사전에 수동으로 입력한 동일한 문화해설 콘텐츠를 다수의 관람객에게 반복 전달하는 형태로만 제공되는데 그치고 있다. 본 논문에서는 관람객이 관람 중인 문화유산을 관람객의 다양한 관심사에 맞추어 문화유산을 다양하게 해설해주기 위한 기초 연구로 영상을 통해 입력된 한국 전통회화에서 도상을 검출하는 연구를 진행하였다. 아직 가능성 타진 연구로 진행되어 현재 제시된 실험 결과에서는 우수한 도상 검출 성능을 내지 못하였지만, 다양한 증강기법과 퓨샷 러닝기법을 통하여 성능 향상을 도모할 경우 충분히 관람객 맞춤형 문화유산 해설 분야에 활용 가능할 것으로 기대된다.

• 보건행정학회지
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• 제11권3호
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• pp.121-150
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• 2001

This study was conducted to investigate provider's behavior change after releasing the information on the Cesarean section rate. Claims data filed at the National Health Insurance Corporation was used for this analysis and the focus of this study was the change of cesarean rate after the public disclosure of information. Average rates of the year 1999 and 2000 were compared, on the institutional basis, and range and coefficient of variation were estimated. For the last decade, Cesarean section rate has been increased dramatically. Clinical or demographic factors could not adequately explain the increase. Instead, nonclinical factors, such as financial incentive, physician's convenience, practice characteristics, etc., were more significant in explaining the increasing rate. Providers' behavior was significantly affected by the public release of information: after the release, average rate was decreased by 10.2%, and variations were also decreased. In particular, the extent of decrease was explained mainly by nonclinical factor rather than clinical ones. The results suggest that disseminating practice information to providers and consumers could contribute to reducing unnecessary medical service.

• 대한전기학회논문지:전력기술부문A
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• 제55권6호
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• pp.227-235
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• 2006

In this paper, autonomous separation methodology of faulted section based on network is proposed newly, which can minimize the outage effect as compared with the existing center-based faulted section separation method by determining and separating autonomously the faulted section by the free operation information exchange among IEDs on the feeder of distribution system. The all IEDs is designed in network in which client/server function is possible in order to separate autonomously the faulted section using PtP(Peer to Peer) communication. Also, Inference based solution of IED for the autonomous faulted section separation is designed by rules obtained from the analyzing results of distribution system topology. Here, the switch IEDs transmit on network the fault information utilizing on multi-casting communication method, at the fame time, determine selfly whether they operates or not by inferencing autonomously the faulted section using the inference-based solution after receiving the transmitted information. Finally, in order to verify the effectiveness and application possibility of the proposed methodology, the diversity fault cases are simulated for the typical distribution system.

• 한국IT서비스학회지
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• 제13권2호
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• pp.251-259
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• 2014

Outdoor cultural properties have been damaged by natural weathering and air pollution for a long time. For this reason, there are many characteristics it is hard to decipher some carved inscription on the surface of damaged outdoor cultural properties. Until now, Rubbed copy has been widely used to decode engraved inscription. A investigation for epigraph has been made by the rubbing that has resulted in a lower resolution from the viewpoints of extraction process and used materials. Rubbing's results are not satisfied in the damaged inscriptions which are weathered by natural environment and pollution for a long time and in the narrowed one. The main analysis presented in this paper is a cross section analysis method using 3d scanning technique for epigraph not read. Cross section analysis is a study on readability improvement method for ancient inscription of irregularity monument surface. Cross section analysis confirms information that separated the inscription information of monument and the ground information to read a ancient inscription and decode the inscription information. The proposed character identification method contributed to decoding an ancient inscription on Silla Monument in Jungseong-ri of Pohang.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2007년도 춘계종합학술대회
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• pp.69-72
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• 2007

최근 광대역 가입자망으로서 HFC 망을 고도화 할 수 있는 DOCSIS 3.0이 표준화되고 있다. DOCSIS 3.0에서는 상향 스트림 프레임에서 경쟁구간의 크기에 따라 프레임의 크기와 예약 구간의 크기에 영향을 받는다. 또한 경쟁구간을 통해 Request를 전송하려는 CM들의 Request 성공률에도 밀접한 관계가 있다. 이 때 다수의 CM들이 경쟁구간을 통해 대역 할당을 요청하기 때문에 발생하는 충돌을 최소화할 수 있는 경쟁구간 설정 알고리즘이 필요하다. 따라서 본 논문에서는 DOCSIS 3.0에서 사용하는 채널-결합 방식을 고려하여 경쟁구간 설정 알고리즘을 제안하였다. 성능 평가를 통해 기존 알고리즘 보다 경쟁구간의 이용률과 절약율에 있어서 더 좋은 성능을 나타냄을 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1829-1831
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• 2001

A novel multi-section power divider configuration is proposed to obtain wide-band frequency performance up to microwave frequency region. Design procedures for the proposed microwave broadband power divider are composed of a planar multi-section three-ports hybrid and a waveguide transformer design procedures. The multi-section power divider is based on design theory of the optimum quarter-wave transformer. Furthermore, in order to obtain the broadband isolation performance between the two adjacent output ports, the odd mode equivalent circuit should be matched by using the lossy element such as resistor. The derived design formula for calculating these odd mode matching elements is based on the singly terminated filter design theory. The waveguide transformer section is designed to suppress the propagation of the higher order modes such as waveguide modes due to employing the metallic electric wall. Simulation and experiment show excellent performance of multi section power divider.

• Ocean and Polar Research
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• 제37권3호
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• pp.225-233
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• 2015

To understand the fluctuation of global carbon levels caused by the biogeochemical cycle within the ocean interior, it is essential to achieve comparability of global oceanic nutrient data to a fairly high degree. The Scientific Committee on Ocean Research (SCOR) commissioned a working group (WG147) to establish a system for achieving comparability of oceanic nutrient data within 1% among laboratories around the world. The introduction of international activities for improving nutrient comparability will facilitate the use of nutrient reference material of seawater by researchers within Korea, which will help in meeting international standards of nutrient comparability and promote international cooperation.