• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2016년도 춘계 종합학술대회 논문집
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• pp.479-480
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• 2016

This study aimed to present the tasks to solve digital divide by understanding the actual condition of the digital divide of persons with disabilities in South Korea. Moreover, It is considered that the factors about qualitative digital divide. As a result, it was found that "Information Utilization Capacity" and "Information Utilization" tend to be higher among the young, more often male, higher education level, higher income people who had some information technology education and experience using telecommunication services. In Addition, all failure type affected the "age", "income", "information technology education" in common. Among them, influence of "age" and "information technology education" has become stronger than the other variables. Therefore, in order to solve the qualitative digital divide, it is required to focus as "age" and "information technology education".

• 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.

• 한국멀티미디어학회논문지
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• 제24권8호
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• pp.1044-1058
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• 2021

Tempered electronic contents have multiplied in last few years, thanks to the emergence of sophisticated artificial intelligence(AI) algorithms. Deepfakes (fake footage, photos, speech, and videos) can be a frightening and destructive phenomenon that has the capacity to distort the facts and hamper reputation by presenting a fake reality. Evidence of ownership or authentication of digital material is crucial for combating the fabricated content influx we are facing today. Current solutions lack the capacity to track digital media's history and provenance. Due to the rise of misrepresentation created by technologies like deepfake, detection algorithms are required to verify the integrity of digital content. Many real-world scenarios have been claimed to benefit from blockchain's authentication capabilities. Despite the scattered efforts surrounding such remedies, relatively little research has been undertaken to discover where blockchain technology can be used to tackle the deepfake problem. Latest blockchain based innovations such as Smart Contract, Hyperledger fabric can play a vital role against the manipulation of digital content. The goal of this paper is to summarize and discuss the ongoing researches related to blockchain's capabilities to protect digital content authentication. We have also suggested a blockchain (smart contract) dependent framework that can keep the data integrity of original content and thus prevent deepfake. This study also aims at discussing how blockchain technology can be used more effectively in deepfake prevention as well as highlight the current state of deepfake video detection research, including the generating process, various detection algorithms, and existing benchmarks.

• Applied Science and Convergence Technology
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• 제24권5호
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• pp.136-141
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• 2015

We studied the compact anode design to develop 100 kW rotating anode X-ray tube with large focal spot 1.2 mm, small focal spot 0.6 mm and tube voltage 150 kV for large hospital digital radiography using computer thermal simulation. The larger thermal radiation effect in a high vacuum can reduce the temperature of anode so the method to increase the surface area of anode is investigated. The anode has the multi-tier shape at the back side of TZM body of anode and also bigger diameter of anode. The number of multi-tiers was varied from 6 to 15 and the diameter of anode was also varied from ${\Phi}74$ to ${\Phi}82$. From ANSYS transient thermal simulation result, we could obtain $1056.4^{\circ}C$ anode maximum temperature when applying 100 kW input power at 0.1 second on target focal track which is less than $1091^{\circ}C$ of the conventional 75 kW X-ray tube with reduced anode weight by 15.5% than the conventional anode. The compact anode of reduced anode weight is able to improve the unwanted noise when the rotor is rotating at high-speed and also reduce the rotational torque which the cost effective stator-coil is possible. It is believed that the anode with 15 ea multi-tiers using ${\Phi}82$ can satisfy with the specification of the anode heat capacity. From the results of this paper, it has been confirmed that the proposed compact anode can be used as the anode of 100 kW rotating anode X-ray tube for digital radiography.

• 설비공학논문집
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• 제25권3호
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• pp.137-142
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• 2013

A small air-conditioner or chiller for a constant temperature bath normally uses a constant speed compressor. The constant speed compressor is relatively inexpensive, but it uses on/off control for capacity modulation. The on/off control has several disadvantages, specifically energy loss and large temperature fluctuation. Continuous operation with a bypass system can be an alternative to on/off control, for capacity modulation. In this study, a heat pump system having a hot-gas bypass and a liquid bypass was adopted. The performance of the bypass-type heat pump was measured, by varying the bypass valve opening. The differences of the COP between the hot-gas bypass and the liquid bypass, in the cooling and heating operations, were within 2% and 1%, respectively. The liquid bypass showed a wider range of capacity control in the cooling operation but the hot-gas bypass showed a wider range of capacity control in the heating operation.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권1호
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• pp.570-595
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• 2017

Robust and perceptually-adaptive image watermarking algorithms have mainly targeted gray-scale images either at the modeling or embedding levels despite the widespread availability of color images. Only few of the existing algorithms are specifically designed for color images where color correlation and perception are constructively exploited. In this paper, a new perceptual and high-capacity color image watermarking solution is proposed based on the extension of Tsui et al. algorithm. The $CIEL^*a^*b^*$ space and the spatio-chromatic Fourier transform (SCFT) are combined along with a perceptual model to hide watermarks in color images where the embedding process reconciles between the conflicting requirements of digital watermarking. The perceptual model, based on an emerging color image model, exploits the non-uniform just-noticeable color difference (NUJNCD) thresholds of the $CIEL^*a^*b^*$ space. Also, spread-spectrum techniques and semi-random low-density parity check codes (SR-LDPC) are used to boost the watermark robustness and capacity. Unlike, existing color-based models, the data hiding capacity of our scheme relies on a game-theoretic model where upper bounds for watermark embedding are derived. Finally, the proposed watermarking solution outperforms existing color-based watermarking schemes in terms of robustness to standard image/color attacks, hiding capacity and imperceptibility.

• 한국콘텐츠학회논문지
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• 제7권2호
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• pp.180-190
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• 2007

최근 각종사건 수사에 디지털 증거의 효용성이 증대되고 있다. 디지털 저장매체가 실생활에 폭넓게 사용됨에 따라 유죄입증이 가능한 결정적 증거가 디지털 형태로 남겨져 있는 경우가 빈번하게 발생하고 있기 때문이다. 현재 세계 각국의 수사기관들은 디지털 증거의 효용성을 극대화하기 위한 노력에 많은 관심을 기울이고 있다. 우리나라에서는 디지털 증거의 신뢰성 보증 모델 등에 관한 연구가 컴퓨터 공학, 형사법학 분야 등을 중심으로 꾸준하게 진행되어 왔다. 그러나 수사기관의 수사기법이 신종 범죄를 쫓아가는 상황에서 수사기관의 입법상, 기법상 공백은 발생할 수 밖에 없는 한계를 겪을 수 밖에 없다. 우리나라는 현재 디지털 증거에 관한 명확한 법규가 마련되어 있지 않고 전문 수사 인력이 부족한 실정으로 디지털 수사의 입법적 흠결 보완과 수사기관의 조직개편 등이 요구되고 있다. 본문에서는 날로 전문화되고 다양화되는 각종 사이버 범죄의 효율적 대응을 위한 핵심적 단서인 디지털 증거를 효율적으로 수사하기 위한 방안에 대해 논의하였다.

• 지구물리
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• 제9권4호
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• pp.371-376
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• 2006

고해상도의 디지털 카메라는 근거리 수치사진측량에서 널리 유용하게 사용되고 있으며 점차 활용도가 증가하고 있다. 또한 사진측량 장비의 급속한 발전으로 정밀도가 많이 향상되었고 컴퓨터를 이용한 지형공간정보체계기술의 발달로 더욱 정밀한 3차원 지형의 재현과 면적 및 토공량 산정이 가능하게 되었다. 본 연구에서는 휴대가 간편하고 수치영상의 자체저장능력을 지닌 디지털 카메라를 이용하여 촬영조건의 다양한 변화에 따른 위치오차를 분석하였으며 광속조정을 통하여 높은 정확도의 화소 좌표를 획득하여 3차원 지형의 모델링을 위한 기초 자료로 사용할 수 있도록 하였다.

• International Journal of Contents
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• 제6권2호
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• pp.14-20
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• 2010

Korean Cultural Content Industry is developing creative cultural content based on internationally acknowledged manufacturing capacity, however, in order to become cultural industry with international competitiveness, it has to be planned and made in OMSU way. This research studied and analyzed successful cases of cultural content digital restoration and excellent cases of OSMU-type that has been developed and supported by Korean Culture and Contents Agency. This study suggests the direction of growth on the basis of movement of cultural content industry and cultivating plan of human resources.

• ETRI Journal
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• 제10권2호
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• pp.32-39
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• 1988

In this paper, we describe an effective trunk loop signal processing method and anlayze execution time of the program in the DTCP (Digital Trunk Circuit Processor) in the TDX-1A digital switching stytem. And we also predict a maximum trunk capacity in the DTCP with respect to scanning period based on the call attempt characteristics which has the Poisson distribution.