• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.113-113
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• 2015

공공수역 수질오염 관리에 있어 비점오염원 관리의 중요성이 크게 부각되고 있다. 새만금호 유역은 농경지비율이 40%로서 넓기 때문에 농업비점오염 관리가 중요하다. 농업비점오염 저감을 위한 기법 연구는 국내에서 그 간 상당 수준으로 진행되었지만, 그 기법을 실행할 주체인 농업인이나 지역주민의 역량이나 농업비점오염의 인지도에 대한 연구는 부족한 실정이다. 본 연구는 새만금유역에서 농업비점오염과 관련된 주체들 간의 정보의 소통과 흐름에 대하여 분석해보고, 또한 농업오염 교육 전후에 있어서 지역주민과 농업인의 농업비점오염에 대한 인식도와 교육효과에 대해서 살펴보았다. 먼저, 농업비점오염과 관련된 주체들 간의 지식흐름은 매크로레벨 즉, 정책입안자, 전문가 레벨에서 관련정보가 정체되어 있었고, 실제 농업비점오염 관련 저감 기법이나 정책을 실행하는 주체인 마이크로레벨의 농업인과 지역주민, 이를 지원하는 시군 공무원, 지역전문가 등 매소레벨을 지원하기 위한 정보로 가공 전달되지 못하고 있었다. 농업부서와 환경부서 사이의 농업비점오염에 대한 인식도의 차이가 크게 나타났으며, 특정 분야를 중심으로 활발한 소통이 있는 반면, 정보의 의도적 차단, 자기조직의 대응을 위한 형식적, 임시적 소통이 이루어지고 있었다. 귀농인과 친환경농업인에 대한 교육을 통하여 농업비점오염에 대한 인식도는 교육 전 38.1%에서 교육 후 100%로, 교육 후 농업비점이 오염원이라는 인식도도 친환경농업인 91%, 귀농귀촌인 78%로 응답하였다. 농업비점오염원 관리가 수질개선에 미치는 효과에 대하여는 친환경농업인은 5점 만점에 3.67점, 귀농귀촌인은 4.05점, 농업비점오염원 관리가 필요한지에 대하여 친환경농업인은 4.05점, 귀농귀촌인은 4.09점으로 두 집단 모두 농업비점오염원 관리가 필요하다고 응답하였다. 반면, 친환경 농업은 저감기법의 오염 저감 효과는 높게 인식하였지만, 직접 실행해 볼 의사는 3.4점, 저감 기법을 주위에 소개나 권고할 의사는 3.5점이었다. 또한, 실행 가능한 저감 기법으로는 퇴액비 사용, 완효성 비료사용, 녹비작물재배 등의 순이었다. 저감기법이 어렵다고 응답한 이유는 복잡할거 같다, 귀잖을 것 같다, 추가비용으로 손해, 저감효과 신뢰성 부족, 농업은 오염원이 아니다 등으로 나타났다. 이상의 연구결과를 살펴볼 때, 주체들 간의 정보와 지식흐름을 이어줄 중간조직의 필요성과 농업인의 인식의 변화가 행동의 변화로 이어질 수 있는 교육?홍보 기법과 농업인의 수용성이 높은 저감기법의 개발과 보급이 필요함을 시사하였다.

• 한국노년학
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• v.37 no.3
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• pp.567-582
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• 2017

The purpose of this study is to investigate the path model consisted of action planning, physical activity, and depression in order to obtain an enhanced understanding of their relationship and to support the aged with depression in community. In order to achieve this, precedent study was reviewed and the program with physical activity and action planning was executed. the data of a investigation of action planning, physical activity, and depression of the aged participated in the program which was consisted of physical activity with Action Planning was used and 116 cases were analyzed. The data analysis was done by descriptive statistics, correlation analysis, and path analysis. The results were as follows. First, the path model was accepted. Second, the direct path of action planning to physical activity was significant. Third, the direct path of both action planning and physical activity to depression were significant. Fourth, the effect size of action planning to depression was more than that of physical activity. Fifth, the indirect path of action planning to depression through physical activity was significant. On the basis of these results, this suggests a need to add action planning on national physical activity plan, establish the delivery system for physical activity program with action planning in mental health center in community, and applicate narrative approach skills for qualitative improvement of action planning.

• Applied Chemistry for Engineering
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• v.19 no.5
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• pp.457-465
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• 2008

Development of various medical systems was accomplished through the progress of biotechnological method for therapy of human diseases. Furthermore, drug delivery systems have been investigated to carry the bioactive materials such as drug or gene in the body effectively. The most important thing in this system is to develop biomedical polymers having biocompatibility, biodegradability, and non-toxicity. Chitosan, a natural polymer, has been importantly considered as biomedical materials due to its good biocompatibility and various bio-active characteristics. Since the property of chitosan is differently explained according to the crystalline structures of chitin, the study for structural analysis of chitin has to proceed to apply as a biomaterial. From this point of view, this article introduced the analysis of crystalline structural of chitin, general property of chitosan and potential characteristics of low molecular weight water-soluble chitosan (LMWSC) as a biomaterials. Furthermore, chemical modification of LMWSC using various functional groups was also performed to enhance its bioavailability and emphasize their potential as drug delivery carriers (DDS).

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.7
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• pp.1030-1040
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• 2018

In Distributed Mobility Management (DMM) protocol, the mobility functions are distributed to network edge closer to mobile users. DMM protocol has some advantages of low-cost traffic delivery, optimized routing path, high scalability. However, it needs many mobile anchors to exchange signaling messages and it results in a high signaling cost. Thus, previous works suggested the hybrid DMM protocol to reduce the high signaling cost for long-live sessions and this paper extends a hybrid scheme to the NEMO environment. The mobile routers are installed at vehicles and can move together with several mobile devices. So we can define the high-mobility property for mobile routers and suggest the hybrid scheme using this property. According to the high-mobility property of mobile routers, we can distribute the mobile anchors or allocate a centralized mobile anchor. In this paper, we mathematically analyze the performance of the proposed NEMO-enabled hybrid DMM protocol and show superior performance.

• Journal of Life Science
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• v.13 no.3
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• pp.314-323
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• 2003

The purpose of this study was to examine the effects of xenobiotic nuclear receptors, CAR, SXR, and PPAR${\gamma}$ on the transcriptional activity of estrogen receptor in human breast cancer cell lines and compare with those in human hepatoma cell line. Two different breast cancer cell lines, MCF-7 and MDA-MB-231 were cultured and effects of CAR, SXR, and PPAR${\gamma}$ on the ER-mediated transcriptional activation of synthetic (4ERE)-tk-luciferase reporter gene were analyzed. Consistent with the previous report, CAR significantly inhibited ER-mediated transactivation and SXR repressed modestly whereas the PPAR${\gamma}$ did not repress the ER-mediated transactivation. However, in breast cancer cells neither of the xenobiotic receptors repressed the ER-mediated transactivation. Instead, they tend to increase the transactivation depending on the cell type and xenobiotic nuclear receptors. In MCF-7, SXR but neither CAR nor PPAR${\gamma}$ slightly increased ER-mediated transactivation whereas in MDA-MB-231, CAR and PPAR${\gamma}$ but not SXR tend to increase the transactivation of the reporter gene. These results indicate that the effects of ER cross-talk by the CAR, SXR, and PPAR${\gamma}$ , are different in breast cancer cells from hepatoma cells. In conclusion, the transcriptional regulation by estrogen can involve different cross-talk interaction between estrogen receptor and xenobiotic nuclear receptors depending on the estrogen target cells.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.45 no.6
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• pp.106-113
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• 2008

In this paper, we propose an Entropy-based Cooperative-Aided Routing Protocol (ECARP) in Mobile Ad-hoc fireless Sensor Networks (MAWSN). The main contributions and features of this paper are as follows. First, the entropy-based cooperative routing protocol which is based on node mobility is proposed for supporting stable routing route construction. Second, cooperative data transmission method is used for improving data transmission ratio with the improved SNR. Third, we consider a realistic approach, in the points of view of the MAWSN, based on mobile sensor nodes as well as fixed sensor nodes in sensor fields while the conventional research for sensor networks focus on mainly fixed sensor nodes. The performance evaluation of the proposed routing protocol is performed via simulation and analysis.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.2B
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• pp.80-90
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• 2006

WSN(Wireless Sensor Network) performs to detect and collect environmental information for one purpose. As examples, WSN is applicable for home network, patient management of a hospital, logistics management, status detection during the war and so on. The WSN is composed of a sink node and several sensor nodes and has a constraint in an aspect of energy consumption caused by limited battery resource. So many required mechanisms in WSN should consider the remained energy condition. A routing mechanism is requested to deliver the collected information to a sink considering energy efficiency in WSN. There have been many researches to establish (a) route(s) for data delivery to the sink. In this paper, we propose establishment of efficient routes. We proposed a uniform routing mechanism together with considering energy efficiency. For the routing, we define energy probability as routing metrics information and Performs suppression of exchange of control messages. In addition, we derive to uniformly consume the energy of the sensor node when establishing the routes. Also, we evaluate and analyze the energy efficiency for proposed mechanisms through NS-2 simulator.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.15 no.2
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• pp.53-64
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• 2005

Previous secure routing protocols for wireless sensor networks assume that a sink is static. In many cases, however, a sink operated by man or vehicle is moving. A mobile sink creates a lot of technical problems such as reconfiguration of routing path exposure of sink location. and selection of secure access point node, which are not considered by many previous researches. In this paper, we propose a new secure routing scheme for solving such problems using hi-directional hash chain and delegation nodes of grid structure. This scheme provides a secure routing path and prevents attacker from recognizing the location of a mobile sink in sensor networks. This new method reduces the resource requirements compared to the cashed routing schemes. Simulation results also show that the system is secure and efficient enough.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.4
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• pp.470-476
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• 2008

In this paper, we describe the cause of TDMA noise and distinction method of TDMA noise source in a GSM mobile phone. The causes of TDMA noise are composed of RF(Radio Frequency) energy coupling and low frequency energy coupling by burst ripple. We propose the distinction method of TDMA noise source from output(TDMA noise measurement) and frequency response of a system(audio path). Especially we propose a method of insertion loss($S_{21}$) analysis and the improvement method for RF energy coupling. Capacitor(40 pF) is a solution to reduce RF energy coupling and therefore TDMA noise was reduced by 10 dB.

• The KIPS Transactions:PartC
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• v.12C no.5 s.101
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• pp.617-622
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• 2005

Lately, the MANET research has focused on providing routing services with security and previous schemes have been proposed for detecting malicious nodes in a MANET. However, they still include some problems which malicious nodes cannot be found when they falsely report other nodes as malicious. Accordingly, we propose a novel and efficient scheme for detecting malicious nodes using report messages and a report table which is consisted of node ID both for suspecting and reporting when the malicious nodes behave normally during the route discovery, but the other hand they drop and modify packets, or falsely report other nodes as malicious during the data transmission. Our proposed scheme is applicable to not only DSR but aiso AODV. And we provide some simulation results of our proposed scheme by comparing general AODV with our proposed scheme. Simulation results show that our Proposed scheme outperforms general AODV in terms of average packet loss ratio and packet delivery ratio.