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      • KCI우수등재

        갯방풍 지상부 용매 분획물의 비표적 대사체 프로파일링 및 항산화 활성

        김철중,전지형,최선강,유창연,이재근 한국약용작물학회 2022 韓國藥用作物學會誌 Vol.30 No.2

        Background: The soft petiole of the Glehnia littoralis shoot is used as a raw material for food. It contains specific ingredients such as polyacetylene and coumarin. However, basic research considering their safety verification, efficacy, and ingredient identification is needed. Methods and Results: In this study, GC/MS compound profiling and LC/UVD were performed to evaluate the antioxidant activity of G. littoralis shoot extract fractions, and to identify the compounds contained therein. Total phenol and flavonoid content as well as antioxidant activity were maximum in the ethyl acetate layer, and a significant correlation was confirmed between total phenol content and antioxidant activity. GC/MS compound profiling, revealed a total of more than 40 compounds, and active ingredients such as coumarin-based phellopterin unique to G. littoralis and polyacetylene-based falcarinol (panaxinol) were qualitatively analyzed. The highest coumarin content was found in the ethyl acetate layer. Conclusions: In this study, the antioxidant activity and compounds contained in the shoot (soft petiole) fractions of G. littoralis were confirmed. These basic data may contribute to expanding the material value of G. littoralis in the future.

      • 최신 의학정보 - 요란한 코골이 고혈압을 부른다

        김철중,Kim, Cheol-Jung 한국건강관리협회 2013 건강소식 Vol.37 No.4

        코골이는 자는 동안 들이마신 숨이 폐로 잘 들어가지 못하고 구강 안에서 맴도는 현상이다. 그러니 코를 골면 산소 부족이 오고, 이는 수면 부족으로 이어진다. 코골이는 거기서 끝나지 않고 고혈압의 원인이 되기도 한다.

      • KCI우수등재

        저분자 진세노사이드를 함유한 산삼배양근 증숙 추출물의 Acetylcholinesterase 억제 및 신경세포 보호효과

        김철중,전지형,성은수,최선강,임정대,유창연,이재근 한국약용작물학회 2021 韓國藥用作物學會誌 Vol.29 No.6

        Background: Ginsenosides are known to have anti-cancer, anti-inflammatory, and antioxidant effects. Additionally, they are known to improve cognitive ability and memory, and prevent dementia. In this study, the physiological activity of cultured wild ginseng adventitious root (ginseng root, GS) containing low molecular weight ginsenosides was investigated in vitro. Methods and Results: This experiment was conducted to confirm the acetylcolinesterase (AChE) inhibitory activity, neuroprotectivie effect, and antioxidant effect of GS steam treatment. Through the steaming process, a GS steam treatment containing low molecular weight ginsenosides was prepared and evaluated. The results showed that AChE inhibitory activity, neuroprotective effect, reactive oxygen species (ROS) inhibitory effect, and catalase (CAT) activity effect by H2O2 were concentration-dependent in the group treated with GS steam treatment compared to those in the control group. Conclusions: In this study, it was demonstrated that the GS steam treatment influenced the AChE inhibitory activity, the neuroprotective effect, and the oxidative stress protective effect of GS.

      • 액티브 네트워크의 성능 향상을 위한 액티브 라우터 설계 및 성능 분석

        김철중,정선화,박석천,Kim, Cheol-Joong,Jung, Sun-Hwa,Park, Seok-Cheon 한국정보처리학회 2008 정보처리학회논문지 C : 정보통신,정보보안 Vol.15 No.6

        액티브 네트워크란 네트워크의 중간에 위치한 라우터나 스위치에 프로그램 저장 및 실행 기능을 부여한 차세대 네트워크를 말한다. 현재 인터넷이 지닌 한계점을 해결하기 위하여 액티브 네트워크 기술에 대한 연구들이 활발히 이루어지고 있지만 네트워크의 성능 향상에 대한 연구는 트래픽을 제어하는 수준에 머무르고 있는 실정이다. 또한 액티브 라우터로만 구성된 네트워크를 위주로 연구가 이루어지고 있어 현재 네트워크에 도입이 어려운 문제가 있다. 본 논문에서는 위와 같은 문제점들을 해결하고자 액티브 라우터에서 액티브 패킷의 처리 시간을 단축시킴으로서 액티브 네트워크의 성능을 향상시키기 위하여 액티브 엔진에 copy and forward 방식을 적용한 액티브 라우터를 구현하고 평가하였다. An Active Network is the next generation network that endows ""save program"" and ""execute program"" function to router and switch located middle of the network. Although there are many studies about active network technology to overcome the limitation of Internet but the studies are stagnant at just traffic control level. Also studies mainly focus on active router-constructed network so introduction into current network is hard. This paper implemented and evaluated active router that adopt a ""copy and forward"" method to resolve these problems. It reduces active packet handling time in active router so efficiency of network can be increased.

      • KCI등재

        이동 애드혹 네트워크에서 이웃노드 정보를 이용한 AODV 라우팅 프로토콜의 설계 및 평가

        김철중,박석천,Kim, Cheol-Joong,Park, Seok-Cheon 한국정보처리학회 2008 정보처리학회논문지 C : 정보통신,정보보안 Vol.15 No.3

        A MANET is an autonomous, infrastructureless system that consists of mobile nodes. In MANET, on-demand routing protocols are usually used because network topology changes frequently. The current approach in case of broken routes is to flag an error and re-initiate route discovery either at the source or at the intermediate node. Repairing these broken links is a costly affair in terms of routing overhead and delay involved. Therefore, this paper propose a NAODV(Neighbor-aware AODV) protocol that stands on the basis of an AODV. It sets up the route rapidly if it operates for setting the route directly by using sequence number of neighbor nodes without re-search the route when the route to destination node is broken. Also, it reduces loss of packets. We use NS-2 for the computer simulation and validate that the proposed scheme is better than general AODV in terms of packet delivery ratio and average end-to-end delay. Also, when the proposed protocol is applied to the large ad-hoc network with multiple nodes, the performance is more efficient. 이동성을 가진 다수의 노드들로 구성된 MANET에서는 네트워크 토폴로지의 빈번한 변화에 효과적으로 대응할 수 있는 온디맨드 방식의 라우팅 프로토콜이 주로 사용된다. 기존의 AODV 라우팅 기법에서 목적지 노드가 local repair 지역을 벗어나서 이동하고 있을 때, local repair 방법은 불필요한 시간지연을 가져다 줄 뿐이며, 이러한 local repair 방법으로 인한 시간지연은 전체적인 라우팅 경로의 설정시간을 오래 걸리게 할 뿐 아니라, 생성된 데이터 패킷의 손실을 증가시키는 문제를 가져온다. 따라서 본 논문에서는 목적지 노드까지의 경로 단절시 출발지 노드로 가서 경로 재탐색을 하지 않고 이웃 노드의 순서번호를 이용하여 직접 경로설정을 위한 동작을 할 경우 보다 신속하게 경로를 설정할 수 있으며, 데이터의 패킷 손실도 줄여 줄 수 있는 AODV 기반 효율적인 라우팅 프로토콜인 NAODV 프로토콜을 제안하였다. NS-2를 이용한 시뮬레이션 결과는 제안한 기법이 기존의 AODV 보다 패킷 전달비율, 지연시간 측면에서 향상된 성능을 제공함을 보여준다. 또한 노드의 이동 속도가 빠르고 대형망으로 갈수록 더욱 효과적인 방법임을 확인하였다.

      • KCI등재

        The Positive Analysis on the Consumers Discount Store Selection Factors and Perceptions of Satisfaction - The Case of Incheon -

        김철중,전규림 한국유통경영학회 2008 유통경영학회지 Vol.11 No.5

        We have frequently heard the news that the korean economic is also facing difficulties because of the U. S. economic and global economic downturn. This economic atmosphere can cause the collapse of the middle class. Consumers have been tightening their belts. Especially, the number of customers using discount stores is tending upwards. In this study we will seek to examine the priority order of goods and services that consumers take into account when they choose the discount stores. We inquire several things as the discount store selection factors. The items over 4-point out of 5-point measures are low price, assortment of merchandise, store management, convenience of traffic etc. Low prices held a dominant position as the most important factor in the preference of discount store. What repurchase intentions, satisfaction levels from the Manova Results on the level of service and goodness of fit by regression analysis are high was goods that can meet consumer expectations or the quality of goods. In general a discount store is a business that pursues store management by making the low prices a strong point. This research also shows that low prices have been the most important factor in the preference of stores. The second most important factor was the assortment of merchandise. When it comes to consumers perceptions of satisfaction in discount stores, goods that can meet consumer expectations and product quality were the influential factors in satisfaction level and repurchases. Therefore, the operators of discount stores will have to pay their attention to the high-quality goods that consumers expect. We have frequently heard the news that the korean economic is also facing difficulties because of the U. S. economic and global economic downturn. This economic atmosphere can cause the collapse of the middle class. Consumers have been tightening their belts. Especially, the number of customers using discount stores is tending upwards. In this study we will seek to examine the priority order of goods and services that consumers take into account when they choose the discount stores. We inquire several things as the discount store selection factors. The items over 4-point out of 5-point measures are low price, assortment of merchandise, store management, convenience of traffic etc. Low prices held a dominant position as the most important factor in the preference of discount store. What repurchase intentions, satisfaction levels from the Manova Results on the level of service and goodness of fit by regression analysis are high was goods that can meet consumer expectations or the quality of goods. In general a discount store is a business that pursues store management by making the low prices a strong point. This research also shows that low prices have been the most important factor in the preference of stores. The second most important factor was the assortment of merchandise. When it comes to consumers perceptions of satisfaction in discount stores, goods that can meet consumer expectations and product quality were the influential factors in satisfaction level and repurchases. Therefore, the operators of discount stores will have to pay their attention to the high-quality goods that consumers expect.

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