• The Optical Journal
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• s.109
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• pp.45-49
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• 2007

아시아에서 가장 주목받는 디지털 이미징 전시회인 '2007 서울국제사진영상기자재전/디지털 영상전'이 5월 17일부터 20일까지 나흘간의 일정으로 코엑스 본관 1층 태평양홀에서 성대하게 개최된다. 국내에서 개최되는 국제 규모의 사진 관련 행사 중 최대 규모를 자랑하며 일찍이 코엑스 대표 전시회로 자리매김한 이 전시회는 산자부로 부터 '2007 유망전시회'로 선정되기도 했다. 올해로 16회 째를 맞이하는 이 전시회에는 삼성테크윈을 비롯한 메이저 카메라 업체 및 글로벌 기업들이 대거 참가해 다양한 시연행사와 함께 참관객들에게 잊지 못할 즐거운 체험의 장을 선사할 예정이다. 또한 하루가 다르게 급변하는 사진영상산업의 변화흐름을 체감할 수 있는 특별한 행사가 될 것으로 기대된다.

• The Optical Journal
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• s.129
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• pp.22-23
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• 2010

한국후지제록스(대표 정광은, www.fujixerox.co.kr)는 지난 9월 1일 서울 양재동 엘타워에서 문서관리 솔루션을 통한 기업의 업무생산성 향상을 주제로 하는 '탱큐 컬러' 행사와 함께 기자간담회를 개최하고 디지털 인쇄기 신제품 '컬러 1000 프레스'를 선보였다. 후제제록스는 이날 선보인 고성능 사양에 다양한 상업 인쇄물 제작이 가능한 신제품으로 디지털 인쇄시장을 적극 공략한다는 계획을 밝혔다.

• Proceedings of the Korea Multimedia Society Conference
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• 2004.05a
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• pp.112-116
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• 2004

인터넷 통신의 빠른 발전에 따라 인터넷은 상거래에서 디지털 컨텐츠의 분배를 위한 가장 효율적인 통신로가 되었다. 현재 이 통신로는 무선 환경으로 넓혀지고 있다. 디지털 컨텐츠의 특성상 불법복제와 유통으로 인한 저작권 침해문제가 발생하였고, 이를 해결하기 위해 DRM(Digital Rights Management)기술을 이용하게 되었다. 이에 본 논문에서는 무선환경에서의 DRM에 대한 기술들을 분석하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.6
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• pp.44-52
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• 2017

In this paper, we propose a DFD (Digital Frequency Discriminator) design that has better frequency discrimination and a smaller size. Electronic warfare equipment can analyze different types of radar signal such as those based on Frequency, Pulse Width, Time Of Arrival, Pulse Amplitude, Angle Of Arrival and Modulation On Pulse. In order for electronic warfare equipment to analyze radar signals with a narrow pulse width (less than 100ns), they need to have a special receiver structure called IFM (Instantaneous Frequency Measurement). The DFD (Digital Frequency Discriminator) is usually used for the IFM. Because the existing DFDs are composed of separate circuit devices, they are bulky, heavy, and expensive. To remedy these shortcomings, we use a three delay line ($1{\lambda}$, $4{\lambda}$, $16{\lambda}$) in the DFD, instead of the four delay line ($1{\lambda}$, $4{\lambda}$, $16{\lambda}$, $64{\lambda}$) generally used in the existing DFDs, and apply the microwave integrated circuit method. To enhance the frequency discrimination, we detect the pulse amplitude and perform temperature correction. The proposed DFD has a frequency discrimination error of less than 1.5MHz, affording it better performance than imported DFDs.

• The Optical Journal
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• s.113
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• pp.44-47
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• 2008

상업용 디지털 인쇄시장이 기존 복사기업계의 새로운 블루오션으로 부상하고 있다. 디지털 인쇄 시장에 가장 먼저 진출한 한국후지제록스는 최근 분당 288매 양면출력이 가능한 디지털 흑백 인쇄 시스템 '누베라288'을 출시하며 강한 자신감을 보이고 있는 가운데, 지난해 7월 옵셋 인쇄기와 동등한 품질의 디지털 인쇄기 'IPRC7000VP'를 선보이며 캐논코리아비즈니스솔루션이 후발주자로 추격을 시작한데 이어 11월에는 신도리코가 코닥과 손잡고 컬러.흑백 디지털 인쇄기 '넥스프레스.디지마스터'를 선보이며 시장에 합류했다. 디지털 상업 인쇄시장은 전 세계적으로 연간 30%의 성장률을 보이고 있는 유망 성장 시장으로서 통합문서관리 시장과 함께 복사기 및 프린팅 업체들이 차세대 수익창출원으로서 경쟁적인 마케팅을 펼칠 것으로 보인다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.19 no.12
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• pp.2376-2385
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• 1994

In receiving the digital TV signal, both decoding delay and the channel hopping delay are very critical factors in applications. The intra-slice coding in the MPEG-2 SIMPLE PROFLE of No B-picture is one of the primary methods for short delay time in video decoding. It has the advantage of short decoding delay, but has the drawback of long channel hopping delay time. In this paper, we propose a method to reduce the channel delay with negligible loss in SNR performance. It is shown that dividing pictures into several regions of slices and adding some restriction in motion vector search for inter-frame coding. hence the random acess points are effectively increased. and the channel hopping delay is reduced.

• Journal of Digital Convergence
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• v.20 no.3
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• pp.389-397
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• 2022

As increasing the growth of the Internet in medical area, a new technology to transmit effectively massive medical data is required. In optical internet, all OBS nodes have fiber delay lines, hardware components. These components are calculated under some optimal traffic conditions, and this means that if the conditions change, then the components should be altered. Therefore, in this article a new service differentiation algorithm using the previously installed components is proposed, which is used although the conditions vary. When traffic conditions change, the algorithm dynamically recalculates the threshold value used to decide the length of data bursts. By doing so, irrelevant to changes, the algorithm can maintain the service differentiation between classes without replacing any fiber delay lines. With the algorithm, loss sensitive medical data can be transferred well.

• Journal of Digital Convergence
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• v.10 no.8
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• pp.341-346
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• 2012

This paper reports the findings of research into the effect of flow experience and internet addiction on e-learning participation. The total number of access, playing time of contents and lag time (time between content upload and first access) were investigated as e-learning participation by analyzing web log data. The paper also examines the relationship between academic achievement and e-learning participation. The results suggest that the flow experience significantly correlates with all variables related with e-learning participation and internet addiction significantly correlates with lag time. It is found that female students significantly access more, longer and have shorter lag time than their male counterparts. It also suggest total number of access, lag time and gender difference have significant effect on academic achievement.

• Journal of Digital Contents Society
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• v.18 no.6
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• pp.1207-1211
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• 2017

Long-Reach PON (LR-PON) is a broadband access network using passive optical network (PON) technology which the reach is extended to 100 km or higher. A major challenge in LR-PON is that the propagation delay between OLT and ONUs is increased by a very significant amount. To effectively and fairly distribute the upstream bandwidth dynamically in LR-PON, we propose a new periodic and multi-thread polling based dynamic bandwidth allocation (DBA) algorithm. We compare the proposed algorithm with traditional DBAs and show its advantage on average packet delay. Numerical results are analyzed under varying offered loads.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.4
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• pp.39-46
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• 2009

In this paper, we propose a full digital capacitive sensing touch key reducing the effects due to the variations of resistance and clock frequency. The proposed circuit consists of two capacitive loads to measure and a resistor between the capacitive loads. The method measures the delays of the resistor and two capacitive loads, respectively. The ratio of the two delays is represented as the ratio of the two capacitive loads and is irrelative to the resistance and the clock frequency if quantization error is disregarded. Experimental results show the proposed scheme efficiently reduces the effects due to the variations of clock frequency and resistance. Further more the method has l.04[pF] resolution and can be used as a touch key.