• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.693-694
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• 2006

The high definition digital TV display devices need real-time gamut mapping. This paper proposes a gamut mapping algorithm that used three dimensional reduced resolution look up table and tetrahedral interpolation for real-time processing. The proposed hardware architecture is successfully implemented in FPGA and ASIC.

• Journal of Communications and Networks
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• 제12권3호
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• pp.209-215
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• 2010

In an asymmetrical speed channel environment like asymmetric digital subscriber line, the up-link bandwidth is normally smaller than the down-link bandwidth, which will lead to extremely low utilization of down-link bandwidth when current P2P video transmission is applied. To overcome this, a new fast P2P video transmission method applied in an asymmetrical speed channel environment is proposed in this paper. On the basis of the many-to-one concept, the proposed method uses a new multipeer aggregation technique to enhance the utilization of down-link bandwidth. In addition, an adaptive peer assignment algorithm is also introduced in order to minimize the overall transmission time. Experimental results show that by using our proposed method, the utilization of down-link bandwidth is significantly improved, and the overall transmission time is greatly reduced.

• 대한전기학회논문지
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• 제43권4호
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• pp.553-563
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• 1994

This paper presents a filtering method using neural networks to extract fundamental frequency components of the transient wave signals in power systems. Based on the ability of multilayer feedforward neural networks to approximate any continuous function, a neural networks mapping filter is proposed for the protective distance relaying systems to extract the effective components efficiently. A characteristic feature of this mapping filter is composed of the multilayer perceptron neural networks which are trained by using random signals and those are mapped to the DFT filtering computational structure by GDR(Generalized Delta Rule). The advantage of this approach is demonstrated by the random waves and the fault transient wave signals of EMTP(electromagnetic transients program) in power systems fault conditions. The proposed method is compared with the conventional method and the simulation results show the efficiency of the neural networks.

• 한국지리정보학회지
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• 제7권4호
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• pp.98-108
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• 2004

지역사회능력(community capacity) 개념은 사회경제, 환경 그리고 물리적 배경의 발전지표 및 인자와 연관된 사업을 하는 지역사회 및 지역주민의 능력으로 간주된다. 지역사회발전계획과 관련된 문제점을 효율적으로 분석하는 지역사회의 능력배양은 지리정보시스템을 이용하여 인프라 및 사회경제의 능력향상에 대하여 현 상태를 조사요구 한다. 지역사회의 능력을 증가시키는데 있어 계획된 자산형성의 노력은 지역발전의 일부분으로 볼 수 있다. 공간자산매핑(spatial asset mapping)은 유무형의 자산목록을 만들고 확인하는 일련의 과정이다. 이러한 자산매핑은 인적, 사회문화적, 자연적, 금융적, 디지털적 및 물리적 능력에 관하여 개인, 공동체 그리고 지역사회가 지닌 능력을 조사하며 발전시키는 것을 필요로 한다. 이 연구 목적은 능력배양(capacity building)의 새로운 개념을 제안할 뿐만 아니라 독창적인 자산기반으로 하는 지역사회능력배양의 개념적 모형을 일필지 중심의 공간자산매핑 및 능력매핑과정을 통해서 제시코자 한다.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2007년도 춘계학술발표회 논문집
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• pp.341-344
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• 2007

National Geospatial-Intelligence Agency(NGA) developed VPF in mid 1980 to digitalize military geospatial information. However, because VPF is very complicated system and was severly inefficient in producing, maintaining, and managing the data, VPF was required to be replaced by more efficient data format. These requests resulted in an integrated schema, and eventually VPF. The main idea of using FDB in the production of digital map of non-accessible area is to increase the accuracy. This research focuses on the production of high accuracy digital map by utilizing the FDB. The accuracy of digital map by FDB and by DGN was individually compared with 1m CIB imagery of the Korean peninsula. By analyzing 38 check points based on CIB, DGN showed RMSE of 52m X axis and 49m Y axis. FDB showed 15m in X axis and 13m in Y axis. These results show that the digital map produced using FDB has much higher accuracy than DGN based digital map.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2003년도 춘계학술발표회 논문집
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• pp.357-364
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• 2003

National Geography Institute(NGI, National mapping agency) has been producing national basemap in automated process since middle of 1980's toward the systematic and efficient management of national land. In 1995, Korean government initiated a full-scale implementation of the National Geographic Information System(NGIS) Development Plan. Under the NGIS Development Plan, NGI began to produce digital maps in the scales of 1:1,000, 1:5,000, 1:25,000. However, digital maps of 1:250,000 or less scale, which are currently used for national land planning, were not included in NGIS Development Plan. Also, the existing laws and specifications related to digital maps of 1:250,000 or less scale are not clearly defined. Therefore this study proposed a feature classification system, which defines features that should be represented in digital map of 1:250,000 or less scale.

• Journal of Information Processing Systems
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• 제19권6호
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• pp.756-766
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• 2023

To effectively track the illegal use of digital images and maintain the security of digital image communication on the Internet, this paper proposes a reversible multipurpose image watermarking algorithm based on a deep residual network (ResNet) and perceptual hashing (also called MWR). The algorithm first combines perceptual image hashing to generate a digital fingerprint that depends on the user's identity information and image characteristics. Then it embeds the removable visible watermark and digital fingerprint in two different regions of the orthogonal separation of the image. The embedding strength of the digital fingerprint is computed using ResNet. Because of the embedding of the removable visible watermark, the conflict between the copyright notice and the user's browsing is balanced. Moreover, image authentication and traitor tracking are realized through digital fingerprint insertion. The experiments show that the scheme has good visual transparency and watermark visibility. The use of chaotic mapping in the visible watermark insertion process enhances the security of the multipurpose watermark scheme, and unauthorized users without correct keys cannot effectively remove the visible watermark.

• Journal of Smart Tourism
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• 제4권1호
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• pp.19-29
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• 2024

The objective of this article is to create a model of integrated management from the framework modeling of a digital collaborative network supported by knowledge engineering to make heritage site in the Brazil more effective. It is an exploratory and qualitative research with thematic analysis as technique of data analysis from the collaborative network, digital platform, world heritage, and tourism themes. The snowballing approach was chosen, and the mapping and classification of relevant studies was developed with the use of the spreadsheet tool and the Mendeley® software. The results show that the collaborative network model oriented towards strategic objectives should be supported by a digital platform that provides a technological environment that adds functionalities and digital platform services with the integration of knowledge engineering techniques and tools, enabling the discovery and sharing of knowledge in the collaborative network.

• 대한공간정보학회지
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• 제13권4호
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• pp.11-17
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• 2005

본 연구는 PDA기반의 측량용 매핑시스템을 개발하여 수치지형도를 기반으로 한 측량성과의 수정 및 갱신의 편리성을 증대시키고자 한 것이다. 이를 위해 토털스테이션과 연계한 PDA의 무선통신모듈을 개발하고 이의 효용성을 증대시키기 위한 컨텐츠를 개발하였다. 측량성과 제출용 텍스트 파일의 변환 모듈과 PC에서의 도면 편집을 위해 dxf형식의 데이터 변화 모듈을 구현하였다. 그리고 도면 레이어 제어를 통한 수치지형도의 중첩 및 갱신 모듈을 구현하였다. 구축 시스템은 현장에서 측량성과의 실시간 도면화 및 좌표 측정을 가능하게 하여 공간위치정보 측정분야에 유용하게 활용될 것이다.

• 한국통신학회논문지
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• 제36권10B호
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• pp.1252-1257
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• 2011

이 논문에서는 오디오 신호의 스펙트럼 가시광선 스펙트럼으로 매핑하는 감성 조명 방식을 제안한다. 인간의 청각이 인지하는 오디오 스펙트럼의 전 대역을 시각이 인지하는 가시광 스펙트럼의 전 대역으로 매핑하는 조명 알고리즘을 제안하며 특히 기본적인 선행 매핑 방식과 특정 주파수 대역을 가조하는 비선형 스펙트럼 매핑 방식에 대하여 논한다. 알고리즘의 효과를 실험하기 위하여 DSP 보드로 구현함으로써 제안된 조명 방식의 응용 가능성을 보였다. 따라서 제안된 조명 방식은 스탠드 LED 조명, 화병 LED 조명, 분수용 LED 조명, 건축물용 LED 조명, 노래방용 LED 조명, 청각 장애인용 LED 음악조명 등의 분야에 응용될 수 있을 것이다.