• The Journal of the Korea Contents Association
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• v.11 no.12
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• pp.504-510
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• 2011

In the culture performance field, device technologies for public performances with new concept is on the rise with the advancement of science. Most designers make use of the performance devices to achieve powerful and dramatic effect in their performances. It increases the perfection of performance. Most of all, applying high technology to performances' stage leads to enhance the space efficiency of the limited stage as well as to enable us to run a fully unmanned performance. This paper proposes a reconstructible electric block system for public performances' stage to heighten the fantastic stage effect variously.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.681-682
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• 2013

• Proceedings of the Korea Information Processing Society Conference
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• 2000.10a
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• pp.841-844
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• 2000

은닉 서명은, 정보 은닉성이 가지는 정보와 서명 사이의 무연관성(unlinlability) 때문에 전자 지불 시스템에서 응용되고 있다. 은닉 서명 생성 과정에 사용되는 계산식에 나타나는 역원 인자 연산은 다른 소수나 이산 대수 기저값과는 달리, 전처리 과정에서 계산될 수 없는 실시간 계산을 추가적으로 요구한다. 이것은 은닉 서명이 전자 지불 시스템에 사용되는 경우, 전체 시스템에 대한 오버헤드로 작용할 수 있는 문제점이 될 수 있다. 본 연구에서는 Okamoto가 제시한 Schnorr 기반 은닉 서명 기법을 근간으로, 은닉 서명 계산 과정에서 역원 계산을 제거하여 은닉 서명 생성 속도를 향상시킬 수 있는 방안을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.04a
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• pp.399-402
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• 2001

최근 초고속 통신망을 이용한 인터넷의 대중화와 더불어 인터넷을 기반으로 하는 전자상거래가 활발해지고 있다. 특히 인터넷을 통한 전자 소프트웨어 유통(ESD:Electronic Software Distribution)은 많은 연구의 대상이 되고 있다[1]. 하지만 기존의 모델들은 실질적인 불법복제방지와 저작권보호에 미흡하고 익명성의 보장이 어려운 단점이 있다. 따라서 본 논문에서는 효율적으로 저작권을 보호하고 구매자의 익명성을 보장하기 위한 ESD 서버를 설계하였다. 제안된 기법은 익명을 원하는 구매자에 대한 정보를 판매자에게 제공하지 않으면서도 불법적인 복제와 유통을 억제한다. 또한 기존의 시리얼넘버(Serial Number)입력방식과 별도의 사용권 설치방식을 지양함으로써 사용자에게 보다 편리한 환경을 제공한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.04b
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• pp.1057-1060
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• 2001

최근 인터넷을 통한 전자 저작물 유통이 확산됨에 따라 저작권을 보호하기 위한 디지털 워터마킹이 많이 이용되고 있다. 종래의 디지털 워터마킹 기법에서는 주로 도장 이미지를 워터마크로 사용해왔다. 본 논문은 도장 이미지가 아닌 복잡한 형태의 이미지를 삽입 할 수 있도륵 워터마크 이미지의 정보를 웨이브릿 변환을 통해 추출하여 삽입, 복원해내는 방법을 제안한다. 또한 웨이브릿 변환 계수를 제로 트리 웨이브릿 부호화 방법을 사용하여 워터마킹에 가장 적절한 계수를 선택해서 저작권 정보를 삽입하도록 한다. 이렇게 하면 적합한 대역에 워터마크를 삽입하게 되어 이미지 변형이 적고 공격에도 강인하게 된다. 이 과정에서 삽입 위치를 랜덤하게 하는 부가적인 과정을 생략할 수 있게 함으로써 효율적인 워터마크 첨가를 가능하게 하였다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.30 no.6
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• pp.339-344
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• 2017

An all-transparent photodetector was fabricated by structuring $Cu_2O$/ZnO/AZO/ITO on a glass substrate. The visible-range transmittance was as high as 80%, which ensures clear vision forhuman eyes. High-transparency metal conductive oxides (p-type $Cu_2O$ and n-type ZnO) were appliedto form the transparent p/n junction. The functional AZO layer was adopted to improve the transparent photodetector performance between the ZnO and ITO, improving the photoresponses because of its electrical conductivity. To clarify the AZO functionality, a comparator device was prepared without the AZO layer in the formation of $Cu_2O$/ZnO/ITO/Glass. The $Cu_2O$/ZnO/AZO/ITO device provided a rectifying ratio of 113.46, significantly better than the 9.44 of the $Cu_2O$/ZnO/ITO device. In addition, the $Cu_2O$/ZnO/AZO/ITO device's photoresponses at short wavelengths were better than those of the comparator. The functioning AZO layer provides ahigh-performing transparent Cu oxide photodetector and may suggest a route for the design of efficient photoelectric devices.

• Journal of Satellite, Information and Communications
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• v.10 no.4
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• pp.128-135
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• 2015

Currently we have an electro-optical space object monitoring system (OWL-Net) developed by the Korea Astronomy and Space Science Institute as the only ground-based on orbit space object tracking capability in Korea. This system can produce the ephemeris of domestic satellites and survey the geosynchronous orbit region. As the number of observation objects increases and the operation condition get worse, a low budget dedicated monitoring telescope capable of full time geosynchronous orbit region survey can support an effect operation of the OWL-Net. In this study, we analyze the requirements of a low-budget dedicated optical monitoring system for geosynchronous orbit region without the degradation of observation quality to increase the risk of corrupted ephemeris.

• Applied Biological Chemistry
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• v.8
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• pp.29-37
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• 1967

Citrus fruits of ten varieties grown in Chaeju island and a few other fruits for the comparison were analyzed to determined the contents of crude fat, crude fiber, total carbohydrates, macroelements and ash. Acids and sugars in fruit juices were also determined and the characteristic of neutralization of fruit juices were investigated. 1. The per cent of edible part of citrus fruits having the range of 48.5(Daingwoochi) to 72(Onju) were lower than that of other fruits. It was lower by about 8 per cent than that of the same variety produced in U.S.A. It was shown that the amount of rind per fruit might be increased in the citrus fruit grown in the low annual temperature. 2. The content of crude protein were around 1% and higher than other's. The contents of crude fat were below 0.1% in three varieties and over 0.1 in others. The contents of crude fiber were between 0.3 to 0.8% and the fruits with the high content of crude protein were inclined to have the high content of crude fiber and it was also shown that the low annual temperature was inclined to increase the amount of crude fiber per fruit. 3. The amount of total acid were from 19.5 m.e per 100 g of fresh fruit in Byongkyul to 44.2 m.e in Daingwoochi. The high percentage of titrable acid was over 90 in two sour varieties, Daingwoochi and Hakyul having pH below 3 and the high content of total acid. These two varieties were above 10 in the ratio of total acid in the edible part to the total acid in the rind(total acid in edible part/total acid in the rind). The content of combined acid was lower than that of titrable acid in the edible part and vice versa in the rind. 4. Navel was highest as 12.82% in the total sugar content and the lowest content was 4.9% of Hakyul. The contents of reducing sugar in the citrus fruits were about half of that in other fruits. The ratio of total sugar to titrable acid (sugar/acid: the grade of sweet taste) were lower than foreign products . 5. From the titration curves of fruit juices the characteristic of neutralization of juices could be grouped in three types, and other values, that is, pH, the content of total acid, the percentage of combined acid, the ratio of total acids in edible part and rind, the content of sugar, and the grade of sweet taste were also devided into the same three categories. 6. The contents of macroelements were different along to the each part of fruit. The content, in the seed were high and the ones in the rind were low. The contents of each element were in the order of $K_2O>N>P_2O_5{\gtrless}CaO{\gtrless}MgO$ in the edible part, $K_2O>N>CaO>P_2O_5{\gtrless}MgO$ in the rind, $N>K_2O>P_2O_5>CaO>MgO$ in the seed. The content of potassium was especially high in Marumeru and Hakyul and the content of calcium in citrus fruit was higher than others.