• The Journal of Korean Institute of Communications and Information Sciences
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• 제25권1B호
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• pp.99-104
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• 2000

In this paper, as a digital watermark we propose to use a chaotic sequence instead of the conventional Gaussian sequence. It is relatively easy to generate the chaotic sequence and is very sensitive to the change of initial value. The chaotic sequence adopted in this paper is a modified version of logistic map to give the sequence distribution of Chebyshev map. In the experiments, we applied the Gaussian sequence and chaotic sequence to wavelet coefficients of images to compare the similarity distribution. The results show that, as id the DCT-based watermarking system, the chaotic sequence is robust for various signal processing attacks, Moreover, the similarity variance is smaller than the Gaussian sequence for iterative experiments. It also shows a better performance for compression errors than the Gaussian sequence.

• Journal of Korea Society of Digital Industry and Information Management
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• 제9권1호
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• pp.9-23
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• 2013

In recent days, there are many researches of wireless LAN services as the communication environment of wireless LAN are so improved that a lot of services are available in wireless environments. The frequency of the wireless LAN is a general resource that can be used to everyone without any permission. Many technologies using this ISM (Industry Science Medical) frequency band are developed fast and widely. But, as many devices use the same frequency band at th same time, the service quality is degraded and the speed of the service rate id degraded by the result of the interference. For overcome this problem, we must provide the new technology of the mobile devices and a new cell design scheme for obtaining maximum throughput that considering the wireless environments effectively. In this paper, we explain the main technology at the IEEE 802.11n environments and proposes the optimal cell design and reference model for gaining maximum performance to many mobile devices at the same time by investigating real environment testing results.

• Convergence Security Journal
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• 제5권1호
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• pp.29-34
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• 2005

Internet becomes absolutely necessary tools due to rapid progress of information technology. Educational correspondence about an age of information demand is focused on a learner and remote education based on information technology WBI(Web Based Instruction) is a formation that remotly educate a learner using web, possible mutual reaction between instructor and learner, submit various studying material, has a good point to overcome spatial restriction. Internal and external standardization working is accelerated and recently XML security studies are activated using XML which is next generation web standard document format. In this paper, we propose multi-Certification of agent system using XML digital signature to satisfy security requirement.

• Journal of Korea Society of Digital Industry and Information Management
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• 제19권3호
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• pp.213-220
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• 2023

Face recognition is a very important process in video monitoring and is a type of biometric technology. It is mainly used for identification and security purposes, such as ID cards, licenses, and passports. The recognition process has many variables and is complex, so development has been slow. In this paper, we proposed a face recognition method using CNN, which has been re-examined due to the recent development of computers and algorithms, and compared with the feature comparison method, which is an existing face recognition algorithm, to verify performance. The proposed face search method is divided into a face region extraction step and a learning step. For learning, face images were standardized to 50×50 pixels, and learning was conducted while minimizing unnecessary nodes. In this paper, convolution and polling-based techniques, which are one of the deep learning technologies, were used for learning, and 1,000 face images were randomly selected from among 7,000 images of Caltech, and as a result of inspection, the final recognition rate was 98%.

• The Journal of the Convergence on Culture Technology
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• 제8권4호
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• pp.469-476
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• 2022

As the 3D modeling technology and conversational algorithm is developed, digital humans are being used in various fields, and also virtual bankers have begun to appear in banks, including major banks such as Shin-Han Bank and Nong-Hyup Bank. However, most of the research of digital human mainly focus on its appearance, and research on robot persona that should be considered in anthropomorphizing a robot is insufficient. In this study, an experiment was conducted to find out the user experience of three scenarios (student ID receipt, deposit and withdrawal account opening, leasehold loan consultation) in which the level of anthropomorphism of the speech strategy and the level of personal information use differed in the specific context of banking. As a result of the study, social presence and usefulness had an interactive effect on the scenario and the level of anthropomorphism. There was no interaction effect on intimacy, trustworthiness, and perceived intelligence, but a tendency could be confirmed.

• Journal of Korea Multimedia Society
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• 제19권2호
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• pp.334-343
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• 2016

In this paper, we developed a low cost smart puck system that can interact with the intuitive operation of natural finger touches. The tangible smart puck, designed for capacitive tabletop display, has Arduino embedded processor which communicates only with the MT server. The MT server communicates both to the smart puck and the display server. The display server displays the relevance information on the location of the smart pucks on the tabletop display and handles interactions with the users. The experiment results show that the accuracy of identifying the smart puck ID was very reliable enough to use in practice, and the information presentation processing time is confirmed excellent enough compared to traditional expensive commercial products.

• Proceedings of the IEEK Conference
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• 대한전자공학회 2004년도 학술대회지
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• pp.631-635
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• 2004

The rapid development of digital media and communication network urgently brings about the need of data certification technology to protect IPR (Intellectual property right). This paper proposed a new watermarking method for embedding contents owner's audio signal in order to protect color image IPR. Since this method evolves the existing static model and embeds audio signal of big data, it has the advantage of restoring signal transformed due to attacks. Three basic stages of watermarking include: 1) Encode analogue ID owner's audio signal using PCM and create new 3D audio watermark; 2) Interleave 3D audio watermark by linear bit expansion and 3) Transform Y signal of color image into wavelet and embed interleaved audio watermark in the low frequency band on the transform domain. The results demonstrated that the audio signal embedding in color image proposed in this paper enhanced robustness against lossy JPEG compression, standard image compression and image cropping and rotation which remove a part of image.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 한국방송공학회 2001년도 정기총회 및 학술대회
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• pp.163-168
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• 2001

본 논문은 인터넷을 이용한 방송 서비스에서 저작권 보호 및 저작물 식별을 위한 고유 식별 정보(unique identification)를 삽입, 추출하는 기술을 제안한다. 인터넷을 통한 방송 서비스의 활성화를 위해서는 저작권의 보호와 저작물의 불법 사용 방지, 저작물에 대한 저작권료 지불, 그리고 차후에 불법 사용자의 적발 등을 할 수 있는 기술이 필요하다. 본 논문에서 제안하는 기술은 디지털 음악을 소비자에게 서비스할 때, 사용자의 아이디(ID)와 신상 정보를 이용해서 생성된 정보와 음악의 식별 정보를 같이 저작물에 삽입하여 다운로드 받은 음악 파일이나 또는 청취 중에 녹음한 음악 파일을 불법으로 유통시킬 경우에 유통된 음악 파일에서 삽입된 식별코드를 추출하여 음악 파일의 불법 유통경로를 추적하여 불법 사용자를 적발할 수 있는 기능을 갖고 있다. 이러한 기능을 만족시키기 위해서 인터넷 서비스에서 널리 이용되는 MP3, AAC, WMA 등과 같은 손실 압축을 거친 이후에도 삽입된 워터마크를 검출할 수 있으며, 일반 사용자들이 손쉽게 접할 수 있는 여러 신호처리에도 강인한 특성을 갖는 기술을 제안한다.

• Proceedings of the Korea Contents Association Conference
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• 한국콘텐츠학회 2004년도 추계 종합학술대회 논문집
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• pp.457-460
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• 2004

The unit of the digital content delivery is the web object. For the improvement of the content delivery based on the web, it id required analysis of reference characteristics of the web object. In this study, we analyze reference characteristics of the web object. Using these analysis results, we propose the method which improve the delivery performance of the web object.

• Proceedings of the Korea Multimedia Society Conference
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• 한국멀티미디어학회 2012년도 춘계학술발표대회논문집
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• pp.193-194
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• 2012

현재 자연재해 증가와 응급 상황 발생이 빈번해짐에 따라 정부에서 소방법을 강화하였다. 따라서 대부분의 빌딩에서는 응급 상황이나 자연 재해 발생이 발생할 경우, 신속한 대피를 위한 안내 방송을 할 수 있는 전관 방송 시스템 설비를 반드시 갖추어야 한다. 이에 본 연구에서는 빌딩에 설비되어 있는 각종 다양한 센서들로부터 센싱된 정보를 네트워크를 통해 전달 받아 이들을 실시간으로 분석하여 빌딩 상황에 맞는 안내 방송과 응급 상황시 대피를 위한 안내 방송뿐만 아니라 빌딩에 있는 각 호수별로 ID를 부여하고, 이를 통해 방송이 필요한 장소에만 개별 방송을 할 수 있는 디지털 전관 방송 시스템을 개발하였다.