• Title/Summary/Keyword: P2P Environment

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Mobile DB Service of P2P Environment (P2P 환경에서 모바일 데이터베이스 서비스)

  • Kim, Dong-Hyun
    • The Journal of the Korea institute of electronic communication sciences
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    • v.2 no.1
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    • pp.46-51
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    • 2007
  • The file sharing method from P2P environments with client/server method to be different price does not use an expensive server from radio environment not to be, uses only the client computers and dispersed the joint ownership and a management of data. Human occurs from the client/server method which uses the server of large dosage with like this reason, will be able to minimize the waste of the waste of the material resources. Also valence increasing number of days rock operation of the user provides their benefit of etc. their result comes to be high. Like this is caused by with reason and the many people have an interest in P2P, also currently footlights the researches whice use P2P even in the mobile relation field which is receiving actively, is advanced.

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Mobile DB Service of P2P Environment (P2P 환경에서 모바일 데이터베이스 서비스)

  • Kim, Dong Hyun
    • The Journal of the Korea institute of electronic communication sciences
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    • v.1 no.1
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    • pp.36-41
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    • 2006
  • P2P file sharing environment of the wireless environment of the client and server without using expensive, unlike the way from client to server, personla, you can minimize the waste of material resources. Operations also increase the number of users, such as increased collaboration and provide benefits.

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The Effect of Indoor Wood Environment on Depression and Anxiety (실내 목재환경이 우울 및 불안에 미치는 영향)

  • Park, Yena;Hwang, Jihyun;Chae, Jeong-ho
    • Anxiety and mood
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    • v.18 no.2
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    • pp.56-64
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    • 2022
  • Objective : Creating a psychologically stable indoor environment is a significant factor in modern life. This study was conducted to confirm which type of wood interior decorating environment was beneficial for improving depression and anxiety. Methods : A total of 59 participants will randomly assign to each accommodation by dividing the rest of the three setting with the same structure with 0% wood interior decorating environment, 45% wood environment, and 90% wood environment. The Psychological evaluation measured at three time points, was before exposure to the wood environment (T1), 45 minutes after exposure to the wood environment (T2), and 20 hours after exposure to the wood environment (T3). Results : As a result of examining the effect of the wood interior use ratio on psychological variables, After about 20 hours (T3), there were significant differences in mood state_vigor-activity(𝛘2=7.253, p<0.05), mood state_tension-anxiety (𝛘2=7.041, p<0.05), mood state_anger-hostility(𝛘2=8.318, p<0.05), and state anxiety (𝛘2=7.680, p<0.05). State anxiety also showed a significant difference in T2 (𝛘2=8.811, p<.05). As a result of analyzing the effect on satisfaction and subjective impression, there was a significant difference in satisfaction (𝛘2=6.300, p<0.05) and 'pleasant (𝛘2=6.930, p<0.05), airy (𝛘2=6.628, p<0.05), masculine (𝛘2=6.906, p<0.05), ordinary(𝛘2=6.662, p<0.05), natural (𝛘2=13.924, p<0.001), calm (𝛘2=13.106, p<0.001), safe (𝛘2=7.755, p<0.05)'. Conclusion : The wood interior decorating environment had a positive effect on anxiety and mood, such as lowering depressive and anxious mood and increasing positive changes and as the ratio of wood decoration increased, it had a greater positive effect on emotions.

Effective B-Chord look-up peer in P2P overlay network (P2P 오버레이 네트워크에서 효과적인 Peer 검색을 위한 B-Chord)

  • Hong, Rok Ji;Moon, Il Young
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.7 no.4
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    • pp.1-6
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    • 2011
  • In this paper, search-efficient Bi-directional-Chord(B-Chord) is proposed in P2P (peer-to-Peer) overlay network. Chord is the most popular P2P Look-up protocol. However, it applied to the mobile environment, the search success rate become lower and the request delay time increases. That is big problem. Thus, by improving the existing Chord, in this paper proposed B-Chord reduces the request delay time to in a mobile environment. Proposed B-Chord have the two Finger table and can search by selecting Finger table depending on the value of Key. By use these bi-directional, it can reduce the number of nodes Hop and search delay time. Thus, As a result, it will be able to increase the search success rate in a mobile environment.

Similarity measure for P2P processing of semantic data (시맨틱웹 데이터의 P2P 처리를 위한 유사도 측정)

  • Kim, Byung Gon;Kim, Youn Hee
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.6 no.4
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    • pp.11-20
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    • 2010
  • Ontology is important role in semantic web to construct and query semantic data. Because of dynamic characteristic of ontology, P2P environment is considered for ontology processing in web environment. For efficient processing of ontology in P2P environment, clustering of peers should be considered. When new peer is added to the network, cluster allocation problem of the new peer is important for system efficiency. For clustering of peers with similar chateristics, similarlity measure method of ontology in added peer with ontologies in other clusters is needed. In this paper, we propose similarity measure techniques of ontologies for clustering of peers. Similarity measure method in this paper considered ontology's strucural characteristics like schema, class, property. Results of experiments show that ontologies of similar topics, class, property can be allocated to the same cluster.

Regional Application of the OECD Phosphorus Budget: Comparison of the Input-Output Data Sources (OECD 인 수지 산정법의 지역단위 적용 연구: 유출입 자료 출처 비교)

  • Lim, Do Young;Ryu, Hong-Duck;Chung, Eu Gene;Kim, Yongseok
    • Journal of Environmental Science International
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    • v.26 no.11
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    • pp.1255-1266
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    • 2017
  • Phosphorus (P) is an essential and major nutrient for both plants and animals. However, anthropogenic P in the environment may cause severe problems such as the deterioration of water quality. Therefore, it is essential for the Korean government to manage P in the agricultural sector. The annual P budget for Korea was 46 kg P ha-1 in 2013, placing Korea in second among Organisation for Economic Co-operation and Development (OECD) countries. P surplus and deficiency in agricultural lands can be estimated according to the P budget, which is one of the OECD agri-environment indicators. In the P budget, it is important to ensure consistency in the input-output data sources, in order to apply national and regional policies for the environmentally sound management of agricultural P. This study examines the impacts on the input-output data sources in the regional P budget in Korea. P budgets were between 99-145 kg-P/ha, depending on different data sources. We suggest two recommended data combinations (DC 1 and DC 2) for reliability of the data. P budgets calculated using DC 1 and DC 2 were 128 kg-P/ha and 97 kg-P/ha, respectively. According to the results, one of the core factors affecting P budgets was crop production. In this study, DC 2 was recommended rather than DC 1 in order to consider the cultivated areas for various crops. It is also necessary to analyze the sensitivity of the coefficients used in P budget in the future.

An Efficient P2P System Using Cross-Layer Design for MANETs (MANET 에서의 Cross-Layer 디자인을 사용한 효율적인 P2P 시스템)

  • Park, Ho-Hyun;Choi, Hyun-Duk;Woo, Mi-Ae
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.7B
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    • pp.728-733
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    • 2009
  • An ubiquitous environment has features like peer-to-peer and nomadic environments. Such features can be represented by peer-to-peer systems and mobile ad-hoc networks. P2P systems and MANETs share similar features, appealing for implementing P2P systems in MANET environment. However, if a P2P system designed for wired networks was applied to mobile ad-hoc environment, its performance was not good enough. Subsequently, this paper proposes a P2P system to improve performance using cross-layer design and the goodness of a node as a peer by using routing metric and P2P metric to choose favorable peers to connect. It also utilizes proactive approach for distributing peer information. The simulation results showed that the proposed system produced better performance in query success rate, query response time and energy consumption by reducing the routing path length.

Degradation of p-nitrophenol by Gamma Irradiation

  • Lee, O Mi;Kim, Tae-Hun;Yu, Seungho;Jung, In-ha;Lee, Myunjoo
    • Journal of Radiation Industry
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    • v.5 no.4
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    • pp.353-357
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    • 2011
  • Degradation of p-nitrophenol has been carried out using only gamma irradiation or gamma irradiation with $H_2O_2$ or $Na_2S_2O_8$. Effects of different operating parameters such as initial concentration ($50mg\;l^{-1}$, $100mg\;l^{-1}$, $200mg\;l^{-1}$, $300mg\;l^{-1}$, $400mg\;l^{-1}$, $500mg\;l^{-1}$ and $600mg\;l^{-1}$) on the extent of degradation has been investigated. At 5 kGy, $50mg\;l^{-1}$ p-nitrophenol was completely degraded, and the radiolytic degradation of p-nitrophenol was described by the pseudo-first-order kinetic model. The combination of gamma irradiation with $H_2O_2$ or $Na_2S_2O_8$ leads to an enhanced effect, which remarkably increased the degradation efficiency of p-nitrophenol and TOC removal. However, at high $H_2O_2$ concentration, the efficacy of p-nitrophenol degradation is reduced because ${\cdot}OH$ radicals are scavenged by $H_2O_2$ and $Na_2S_2O_8$.

An Analytic Study on factors Affecting the School Nurse's Activities in Daegu City and Kyungpook Province (대구.경북지역 일부 양호교사의 업무수행에 미치는 요인분석)

  • Gwak, Oh-Gae
    • Research in Community and Public Health Nursing
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    • v.1 no.1
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    • pp.503-517
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    • 1989
  • This study is to analyze factors affecting the school nurse's activities. The survey was undertaken during Sept. 1-Nov. 30, 1986. The subjects were 137 school nurses from elementary, junior-high, and senior-high schools in Daegu City and Kyungppk Province. The results are as follows: 1. Correlational findings between school nurse's self-confidence and their general characteristics 1) Program Planning & Evaluation: Health Experinece(r=-0.1803, p<0.05) Salary Step(r=-0.1741, p<0.05) 2) Clinic Management: Salary STep(r=-0.2580, p<0.01) 3) Health Education: Salary Step(r=-0.1929, p<0.05) 4) Management of School Environment: Salary Step(r=-0.2501, p<.05) 5) Health Care Services: Health Experience(r=0.1901, p<0.05) Salary Step(r=-0.2424, p<0.05) 2. The degrees of school nurse's self-confidence(high: 4 point, low: 1 point) 1) Clinic Management: 2.92 2) Health Education: 2.86. 3) Program Planning & Evaluation: 2.74 4) Health Care Services: 2.73 5) Management of School Environment: 2.67 6) Operating of School Health Organization: 2.42 3. Significances to self-confidence on school nurse's activities 1) Program Planning as Evaluation: Expending Times for Health Care Services (r=-0.2262, p<0.05) Expending Times for Health Education (r=0.2943, p<0.05) Size of Clinic(r=0.2163, p<0.05) Location of Clinic(t=2.43, gH0.047) Use of Clinic(t=2.06, p<0.007) 2) Clinic Management: Location of Clinic (t=3.36, p<0.010) 3) Health Education: Purchase of Medicine(r=-0.1736, p<0.05) No, of Classes (r=-0.1794, p<0.05) (4) Management of School Environment: School Health Budget(r=0.1731, p<0.05) Home Message(r=0.1805, p<0.05) Location of Clinic(t=4.46, p<0.0001) 5) Operating of School Health Organization: School Health Budget(r=0.1878, p<0.05) Use of Clinic(t:1.90, p<0.018) 6) Health Care Services: School Health Budget(r=1.90, p<0.018) Expending Times for Health Education(r=0.2577, p<0.05) Size of Clinic(r=0.4336, p<0.001) Location of Clinic(t:5.10, p<0.001)

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Secure file distribution method using distribution P2P system (분산 P2P 시스템을 활용한 안전한 파일 분산 방안)

  • Kim, Jin-Hong;Kim, Seon-Young;Lee, Yoon-Jin;Jo, In-June
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.2
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    • pp.545-548
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    • 2005
  • Recently, the computing environment of P2P come out to solve the excessive load of the server in the computing environment of the client/server. Currently, operated computing environment of P2P is mainly spreading out P2P system of read name or anonymity base about a publisher, sender and receiver of the file. But, to the current file protection there is three problem. The first problem is to a host become attack target. The second is to received file loose attack of Brute Force. The third is to define target of attack of DOS. To solve the this problem. it divide file into block unit. Each block is safely scattered peers. This paper propose the distribution P2P system of file division. Both proposing system solve the this problem and promote efficiency of file application.

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