• Journal of Ginseng Research
• /
• v.17 no.1
• /
• pp.77-97
• /
• 1993

• Archives of Pharmacal Research
• /
• v.29 no.11
• /
• pp.942-945
• /
• 2006

A novel quinone derivative, Griseusin C (1), along with a known quinone, Naphthoquinone C (2), was isolated from the lyophilized culture broth of the marine-derived fungus Penicillium sp. The structures were elucidated on the basis of extensive 1D-and 2D-NMR, as well as HRESIMS, spectroscopic analysis. The relative stereochemistries of the compounds were assessed by NOESY analysis.

• Journal of Communications and Networks
• /
• v.7 no.1
• /
• pp.45-53
• /
• 2005

In this paper, we present a cross-layer analysis of wireless TCP systems over correlated channels. The effects of error correlation on the behavior of link retransmission strategy and the end-to-end throughput of TCP layer are investigated. Based on the cross-layer analysis, an efficient refinement of link layer protocol is proposed by consciously utilizing the information of channel correlations, which leads to the performance improvement of wireless TCP systems.

• Proceedings of the Korea Contents Association Conference
• /
• 2018.05a
• /
• pp.411-412
• /
• 2018

중국 수묵 애니메이션의 확대 발전을 위해서는 수묵 애니메이션의 퀄리티와 양적인 확대가 필요하다. 이를 위해 수묵화 이미지를 이용해 수묵 애니메이션 구현을 최적화하는 방법으로 애니메이션 장르를 다양화해 양적인 문제를 해결하는 방법을 찾으려 했다. 기술이 발달함에 따라 가상현실 콘텐츠로의 수묵 애니메이션 제작에 필요한 적용 방법을 기 제작된 수묵 애니메이션을 바탕으로 VR 확대 연구를 진행해 보았다.

• Proceedings of the Korean Institute of Resources Recycling Conference
• /
• 2006.05a
• /
• pp.140-144
• /
• 2006

• Communications of the Korean Mathematical Society
• /
• v.20 no.2
• /
• pp.365-379
• /
• 2005

The purpose of this paper is to correct erroneous proofs of theorems of He, Lu, Wang and Zheng [1] about the topological pressure of continuous flows without fixed points and to give proofs of some results which are stated in the literature without proofs and thereby to show that their theorems are still true.

• Journal of Electrical Engineering and Technology
• /
• v.11 no.5
• /
• pp.1242-1252
• /
• 2016

• Journal of Electrical Engineering and Technology
• /
• v.11 no.5
• /
• pp.1202-1209
• /
• 2016

• Proceedings of the Korea Multimedia Society Conference
• /
• 2003.05b
• /
• pp.219-223
• /
• 2003

디지털 서명과 암호화를 동시에 수행할 수 있는 Signcryption 방식이 Zheng에 의해 제안되었다[1]. 그 후, 서명과 암호화에 요구되는 작업을 상대적으로 성능이 뛰어난 서버에 의뢰 가능하도록 하는 Proxy-Signcryption을 이동통신 환경에 적합하도록 개선한 방식이 제안되었다[2]. 그러나 개선 방식은 효율성과 forword secrecy는 제공하지만 대리자의 부정은 방지할 수 없어 문제가 발생할 수 있다. 따라서 본 논문에서는 대리자가 부정하였을 경우 대리자의 개인키가 노출되도록 한 안전한 Proxy-Signcryption 방식을 제안한다.

• Communications of the Korean Mathematical Society
• /
• v.27 no.2
• /
• pp.377-384
• /
• 2012

In this paper some properties of sequentially closed sets and $k$-closed sets in a topological space are discussed, it is shown that a space is a $k$-quotient image of a metric space if and only if its each sequentially closed set is $k$-closed, and some related examples about connectedness are obtained.