• Korean Journal of Pharmacognosy
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• v.16 no.4
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• pp.248-252
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• 1985

During the biological screening of Chinese drugs, it was found that alcoholic extract of the roots of Patrinia scabiosaefolia (Valerianaceae) caused a significant prolongation of hexobarbital-induced sleeping time and elevation of serum transaminase activities accompanied by severe histopathological changes in the hepatic tissues in mice on three day pretreatments. The systematic fractionation of the methanol extract monitoring by bioassay led to isolation of toxic saponins such as $3-O-{\alpha}-{_L}-arabinopyranosyl$ hederagenin $28-O-{\beta}-{_D}-glucopyranosyl\;(1{\rightarrow}6)-{\beta}-{_D}-glucopyranoside$ and its 2'-acetate and $3-O-{\beta}-{_D}-glucopyranosyl\;(1{\rightarrow}3)-{\alpha}-{_L}-rhamnopyranosyl\;(1{\rightarrow}2)-{\alpha}-{_L}-arabinopyranosyl$ oleanolic acid and its $28-O-{\beta}-{_D}-glucopyranosyl\;(1{\rightarrow}6)-{\beta}-{_D}-glucopyranoside$.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06b
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• pp.252-254
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• 2011

스마트폰의 보급이 늘어나면서 스마트폰을 이용한 인터넷 접속량 역시 빠른 속도로 증가하고 있다. 하지만, 스마트폰은 데스크탑 환경에 비해 제한적인 화면 크기를 가지고 있고 따라서 웹 브라우징을 할 때 확대, 축소, 스크롤 등의 작업을 반복적으로 수행해야 하는 단점을 지니고 있다. 이에 본 논문에서는 스케치 기법을 이용하여 사용자가 원하는 브라우징 영역을 지정하고 그 영역 안의 내용들을 분석하여 페이지를 재구성하고 컷아웃으로 화면 중앙에 출력하여 웹 브라우징을 간편화할 수 있는 컷아웃 기반의 브라우징 인터페이스를 제안한다.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.251-252
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• 2008

Throughput and quality-of-service (QoS) over multi-cell environments are two of the most challenging issues that must be addressed when developing next generation wireless network standards. Currently, multiple-input/multiple-output (MIMO), inter-cell coordination and multi-hop relay technologies are viable options for improving channel capacity or coverage extension. Nevertheless, severe QoS degradation occurs in the outer region of multi-cells due to significant interference from neighboring cells or relay stations, thereby limiting overall performance. Therefore, we propose a scheme which adapted to hybrid relaying.

• 한국지구물리탐사학회:학술대회논문집
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• 2003.11a
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• pp.252-254
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• 2003

In this study, it was purposed to develop the new method for the prediction of pollutant concentration in road tunnels. The new method was the use of artificial neural network with the back-propagation algorithm which can model the non-linear system of tunnel environment. This network system was separated into two parts as the visibility and the CO concentration. For this study, data was collected from two highway road tunnels on Yeongdong Expressway. The tunnels have two lanes with one-way direction and adopt the longitudinal ventilation system. The actually measured data from the tunnels was used to develop the neural network system for the prediction of pollutant concentration. The output results from the newly developed neural network system were analysed and compared with the calculated values by PIARC method. Results showed that the prediction accuracy by the neural network system was approximately five times better than the one by PIARC method. ill addition, the system predicted much more accurately at the situation where the drivers have to be stayed for a while in tunnels caused by the low velocity of vehicles.

• Animal Systematics, Evolution and Diversity
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• v.29 no.3
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• pp.249-252
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• 2013

A taxonomic study of the Korean Hydrochus Leach is presented. They inhabit in the margins of shallow lentic water with plentiful vegetation. The genus Hydrochus Leach contains about 28 species in the Palaearctic region and only H. japonicus Sharp is recently listed in Korea. Here, two species are recognized, one of which is reported for the first time in Korea (H. chubu Balfour-Browne & Sat$\hat{o}$). This species are distinguished from H. aequalis Sharp by impressed pronotum and from H. japonicus by dark brown elytra. Habitus photographs, descriptions, and diagnostic characters with illustrations of the species are provided.

• Journal of Korean Society on Water Environment
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• v.22 no.6
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• pp.1075-1081
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• 2006

In this research, mortality rates of pathogen indicator microorganisms discharged from various point sources and diffuse sources in urban area were measured. Water samples were taken at domestic sewer, combined sewer overflow, effluent from a wastewater treatment plant, urban river, and sediment of an urban river. Mortality rates of indicator microorganisms in domestic sewer estimated by assuming the first order kinetics at $20^{\circ}C$ were as follows: total coliform = 0.092/day, fecal coliform = 0.185/day, E. coli = 0.252/day, and fecal streptococci = 0.281/day. Sensitivity of mortality rates of total coliform on temperature was estimated as $K_{temp}=K_{20}{\times}1.162^{(temp-20)}$ for the range of $10-20^{\circ}C$. Mortality rates due to sunlight were measured as 1.22-1.59/day while mortality rate due to settling for 40 min were estimated as $9.21{\times}10^3-20.0{\times}10^3/day$.

• Proceedings of the Korea Contents Association Conference
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• 2014.11a
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• pp.251-252
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• 2014

최근 들어, 여러 곳에서 산업재해가 발생하여 심각한 인명피해와 경제적인 손실을 불러오고 있다. 산업재해의 발생빈도를 최대한 줄이기 위해서는 산업재해의 원인이 되는 다양한 요소들을 파악하여 원인을 차단하는 것이 필수적이다. 본 논문은 여러 산업재해 간 유사성이 존재한다는 사실에 기반 하여 산업재해 빅 데이터 분석을 통해 사고를 일으킬 수 있는 원인을 파악하여 잠재적인 사고의 발생을 예방하고, 위업요인을 예측할 수 있는 효율적인 산업재해 빅 데이터 활용방법을 제시한다.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06d
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• pp.252-255
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• 2011

인터넷 트래픽의 증가로 인해서 트래픽을 분석, 관리의 필요성이 높아졌다. 인터넷 트래픽의 분석은 크게 패킷 기반의 트래픽 분석과 플로우 기반의 트래픽 분석으로 나눌 수 있다. 증가한 트래픽 양으로 인하여 패킷 기반의 트래픽 분석보다 정확도는 낮지만 빠른 속도를 보장하는 플로우 기반의 트래픽 분석이 널리 이용되고 있다. 하지만 플로우 데이터 분석 서버를 새롭게 구축하거나 기존의 서버를 업그레이드 하는 경우 초기 설치 비용 및 서버 관리 비용이 증가한다. 증가한 비용을 낮추고 트래픽을 분석하는 사용자가 쉽게 사용할 수 있으며 확장 가능하고 고 가용성을 보장하는 Hadoop 기반의 트래픽 분석 시스템을 제안하고자 한다.

• Journal of Communications and Networks
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• v.15 no.3
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• pp.252-257
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• 2013

To alleviate the damage caused by key exposures, Dodis et al. introduced the notion of key-insulated security where secret keys are periodically updated by using a physically insulated helper key. To decrease the risk of helper key exposures, Hanaoka et al. advocated parallel key-insulated mechanism where distinct helpers are independently used in key updates. In this paper, we propose the first parallel key-insulated signature scheme which is provably secure without resorting to the random oracle methodology. Our scheme not only allows frequent key updating, but also does not increase the risk of helper key exposures.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.249-252
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• 2018

사건 현장을 재현하는 것은 수사에서 매우 중요한 일이다. CCTV가 현장 파악에 유용하기는 하지만 세부적인 상황파악에는 한계가 있다. 현대는 디지털 시대인 만큼 사건 현장에서는 많은 디지털 흔적이 남게 된다. 스마트폰의 디지털 흔적도 사고경위 파악에 유용하다. 본 논문에서는 특히 안드로이드 스마트폰의 블루투스 디지털 기록을 이용하여 보다 정교하게 현장을 재현하는 방법에 대하여 연구하였다.