283 research outputs found
Anomaly Detection For Network Servers Using Digital Signature Of Network Segment
No full textNetwork anomaly detection is essential for rapid fault recovery and increasing network reliability. This paper presents results of the utilization of digital signature of network segments (DSNS) for network servers to characterize the traffic that flow through the network servers. It's also presented an alarm system model that use the network servers' traffic characterization generated by DSNS. The obtained results validate the experiment and show in practice significant advantages in networks management. © 2005 IEEE.2005290295Barford, P., Kline, J., Plonka, D., Ron, A., A signal analysis of network traffic anomalies, internet measurement workshop (2002) Proceedings of the Second ACM SIGCOMM Workshop on Internet Measurement, , Marseille, ISBN:1-58113-603-XThottan, M., Ji, C., Anomaly detection in IP networks (2003) Signal Processing, IEEE Transactions on, 51 (8). , AugLakhina, A., Crovella, M., Diot, C., Diagnosing network-wide traffic anomalies (2004) SIGCOMM'04, , Portland, Oregon, USA, ISBN: 1-58113-862-8Rueda, A., Kinsner, A survey of traffic characterization techniques in telecommunication networks (1996) Electrical and Computer Engineering, 1996. Canadian Conference on, 2, pp. 830-833. , Iss., 26-29 May vol.2Adas, A., Traffic models in broadband networks (1997) Communications Magazine, 35 (7), pp. 82-89. , IEEE, JulProença Jr., M.L., Coppelmans, C.M.L., The hurst parameter for digital signature of network segment (2004) LNCS, 3124. , 11 INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS - ICT 2004, Fortaleza. Springer-Verlag. 08, ISBN 3-540-22571-4Papavassiliou, S., Pace, M., Zawadzki, A., Ho, L., Implementing enhanced network maintenance for transaction access services: Tools and applications (2000) Communications, 2000. ICC 2000. IEEE International Conference on, 1. , JuneHajji, H., Baselining network traffic and online faults detection (2003) Communications, 2003. ICC '03. IEEE International Conference on, 1. , 11-15 MayManagement information base for network management of TCP/IP-based internets: MIB-II (1991) RFC, 1213. , marProença Jr., M.L., Uma experiência de gerenciamento de rede com backbone ATM através da ferramenta GBA (2001) XIX Simpósio Brasileiro de Telecomunicaçöes - SBrT 2001, , Fortaleza 03-06/09Martin, B.J., Altman Douglas, G., Statistical methods for assessing agreement between two methods of clinical measurement (1986) The LANCET, 1, pp. 307-310Jain, R., The art of computer systems performance analysis (1991) Techniques for Experimental Design, Measurement, Simulation and Modeling, , Willey ComputingRemote monitoring management information base version (1995) RFC, 1757. , fe
Dependency Graph To Improve Notifications' Semantic On Anomaly Detection
No full textBesides identifying anomalies, detection systems must offer additional information about the occurrence, aiming to help the network administrator in order to build an accurate diagnostic. This paper presents a lightweight approach to detect anomalies, improving the semantic power of notifications sent to network administrator. The key point of the proposed anomaly detection system is a correlation system based on a directed graph which represents the possible paths of anomaly propagation through the SNMP objects in a network element. The results obtained from initial tests were encouraging and showed that our system is able to detect anomalies on the monitored network element, avoiding the high false alarms rate. ©2008 IEEE.726729Cabrera, J.B.D., Lewis, L., Qin, X., Lee, W., Prasanth, R.K., Ravichandran, B., Mehra, R.K., Proactive Detection of Distributed Denial of Service Attacks using MIB Traffic Variables - A Feasibility Study (2001) Integrated Network Management Proceedings, 2001 IEEE/IFIP International Symposium on, pp. 609-622. , 14-18 maioLi, J., Manikopoulos, C., Early Statistical Anomaly Intrusion Detection of DOS Attacks Using MIB Traffic Parameters (2003) Proceedings of the 2003 IEEE Workshop on Information Assurance, pp. 53-59. , United States Military Academy, p, junThottan, M., Ji, C., Anomaly Detection in IP Networks (2003) IEEE Transactions in Signal Processing, 51 (8), pp. 2191-2204. , augW. Stallings SNMP, SNMPv2, SNMPv3, and RMON 1 and 2, 3. Addison-Wesley, 1998McCloghrie, K., Rose, M., (1991) Management Information Base for Network Management of TCP/IP-based internet: MIB-II, , RFC 1213, marProença Jr., M.L., Coppelmans, C., Bottoli, M., Mendes, L.S., The Hurst Parameter for Digital Signature of network Segment (2004) Fortaleza. Springer-Verlag in the LNCS series, pp. 772-781. , 11th International Conference on Telecommunications ICT, aug, 2004Rose, M.T., (1996) The Simple Book: An Introduction to Internet Management, , 2 ed. Prentice-HallGersting, J.L., (2002) Mathematical Structures for Computer Science, , 5 ed, W H FreemanCase, J.D., Partridge, C., Case Diagrams: A First Step to Diagrammed Management Information Bases (1989) ACM SIGCOMM Computer Communication Review, 19, pp. 13-16Zarpelão, B.B., Proença Jr., M.L., Mendes, L.S., Anomaly Detection Aiming Pro-Active Management of Computer Based on Digital Signature of Network Segment (2007) Journal of Network and Systems Management, 15 (2), pp. 267-28
Three Levels Network Analysis For Anomaly Detection
No full textAnomaly detection is fundamental to ensure reliability and security in computer networks. In this work, it is proposed an anomaly detection system that monitors the network in three different levels. In the first one, data is collected from Simple Network Management Protocol (SNMP) objects and compared to profiles of normal traffic, in order to detect behavior changes. Second level of analysis includes a dependency graph that represents the relationships between SNMP objects. It is used to analyze first level alerts, confirming the occurrence of anomalies in device level. In the third level of analysis, second level alerts are grouped according to network topology information, and network administrators are informed about the context where the anomaly occurred. Tests were performed in a real network environment and good results were obtained.281285 IEEE Communications SocietyPark, A.P.E.J.M., An overview of anomaly detection techniques: Existing solutions and latest technological trends (2007) Computer Networks, V. 51 (12), pp. 3448-3470Thottan, M., Ji, C., Anomaly detection in IP networks (2003) IEEE Transactions in Signal Processing, V. 51 (8), pp. 2191-2204Denning, D.E., An intrusion-detection model (1987) IEEE Transactions on Software Engineering, 13 (2), pp. 222-232Barford, P., Kline, J., Plonka, D., Ron, A., A signal analysis of network traffic anomalies (2002) Proceedings of the 2nd ACM SIGCOMM Workshop on Internet Measurement, pp. 71-82Lakhina, A., Crovella, M., Diot, C., Diagnosing network- wide traffic anomalies (2004) ACM SIGCOMM Computer Communication Review, Proc. of the 2004 Conference on Applications, Technologies, Architectures, and Protocols for Computer Communications, 34, pp. 219-230Kim, S.S., Reddy, A.L.N., Statistical techniques for detecting traffic anomalies through packet header data (2008) IEEE/ACM Transactions on Networking, 16 (3)Androulidakis, G., Chatziqiannakis, V., Papavassiliou, S., Network anomaly detection and classification via opportunistic sampling (2009) IEEE Network, 23 (1), pp. 6-12Ringberg, H., Soule, A., Rexford, J., Diot, C., Sensitivity of PCA for traffic anomaly detection (2007) Proceedings of the 2007 ACM SIGMETRICS International Conference on Measurement and Modeling of Computer Systems, pp. 109-120Farraposo, S., Owezarski, P., Monteiro, E.E., A multi- scale tomographic algorithm for detecting and classifying traffic anomalies (2007) Proceedings of IEEE International Conference on Communications 2007, pp. 363-370Stallings, W., (1998) SNMP, SNMPv2, SNMPv3, and RMON 1, 2 and 3, , Addison-WesleyMccloghrie, K., Rose, M., Management information base for network management of TCP/IP-based internet: MIB-II (1991) RFC 1213, , marProença Jr., M.L., Coppelmans, C., Bottoli, M., Mendes, L.S., The hurst parameter for digital signature of network segment (2004) 11th International Conference on Telecommunications (ICT 2004), pp. 772-78
Mosses new to Hong Kong (1)
No full textTen moss species - Garkea flexuosa (Griffith) Marg. & Nork., Campylopus laxitextus Lac., Fissidens dubius P. Beauv., Fissidens ceylonensis Dozy & Molk, Fissidens maceratus Mitt., Philonotis thwaitesii Mitt., Isopterygium minutirameum (C. Muell.)Jaeg., Homalia trichomanoides (Hedw.) B.S.G., Pogonatum neesii (C. Muell.) Dozyand Polytrichum formosum Hedw. are reported new to Hong Kong. Among them, five are new to Guangdong Province of China
Investigation of geometrical properties of single-phase local resonators in the formation of bandgaps in three-dimensional elastic metamaterials
No full textElastic metamaterials – man-made resonant structures exhibiting unusual functionalities – have shown promising results for controlling structural vibration, specially at a low frequency regime. Such functionalities rely on the presence of resonant bandgaps, which consists of a frequency band where waves cannot propagate in response to the out-of-phase motion of the local resonators. Usually, the contrast between the properties of different material phases in such resonators results on the resonant effect, however, the manufacturing of such multi-phase structures is challenging and can be a high-cost process. This work proposes a parametric investigation of an elastic metamaterial constituted by single-phase local resonators. The bandgap formation in such structure depends on the geometrical properties of the resonators, instead of the material parameters. This analysis allows us to understand which geometrical features are sensitive to the position of the resonant bandgaps and its width. Designing such single-phase resonators provides an alternative to manufacture low-cost structures for engineering application.Transport Engineering and Logistic
Cell Transfer Delay Monitoring In Atm Networks
No full textOne of the main features of ATM networks is to allow the establishment of connections with different Quality of Service (QoS) requirements. The monitoring of QoS parameters is fundamental to help network management decisions control traffic contracts. In this paper we present an in-service procedure to monitor end-to-end cell delay in ATM connections through OAM performance management cells. This procedure does not need to use synchronization between network elements in order to accomplish cell monitoring.194203Black, U., (1995) ATM: Foundation For Broadband Networks, , Prentice Hall, London(1999) Traffic Management Specification, Version 4.1, , ATM Forum, AF-TM-0121.000, MarchHuang, A., (1998) Advanced Traffic Management For Multiservice ATM Networks. N.E.T. White Paper, , http://www.net.comArora, A., Baras, J., (1998) Performance Monitoring In ATM Networks - Technical Research Report, , Center for Satellite and Hybrid Communication Networks and Institute of Systems Research, AprilGiroux, N., Ganti, S., (1999) Quality of Service In ATM Networks: State-of-the-art Traffic Management, , Prentice HallRoppel, C., Estimating Cell Transfer Delay in ATM Networks Using In-Service Monitoring Methods (1995) Proceedings of Globecom, pp. 904-908Hernández, J.G., Ghanbari, M., In-service monitoring of quality of service in ATM networks using OAM cells (1999) IEE Proceedings Communications, 146 (2), pp. 102-106. , April(1995) B-ISDN Operations and Maintenance Principles and Functions, , ITU-T Recommendation I.610, May -Chen, T., Monitoring and Control of ATM Networks Using Special Cells (1996) IEEE Network, September/October, pp. 28-38Chen, T., INQIRE: A Software Approach to Monitoring QoS in ATM Networks (1998) IEEE Network, March/April, pp. 32-37Baras, J.S., Arora, A., Mykoniatis, G., Delay Monitoring in ATM Networks (1999) Third Annual Federated Laboratory Symposium On Advanced Telecommunications/ Information Distribution Research Program (ATIRP), pp. 259-263. , University of Maryland, February 2-4Andrade, N.E.L., Alberti, A.M., Mendes, L.S., (2000) Hydragyrum - Ambiente De Simulação De Redes a Eventos Discretos, , XVIII Simpósio Brasileiro de Telecomunicações - SBrT, September, Gramado RS - BrazilSahinoglu, Z., Tekinay, S., On Multimedia Networks Self-Similar Traffic and Network Performance (1999) IEEE Communications Magazine, , Januar
Structural adjustment, ownership transformation, and size in Polish industry
Get PDFThe authors argue that significant adjustment took place in Polish industry after Poland's 1990 reforms. They analyze data on two- and three-digit manufacturing industries, disaggregated by firm ownership and size. By applying a statistical model to labor productivity growth, they try to disentangle structural determinants of the recovery from cyclical determinants. They contend that structural determinants outweigh cyclical ones. They find that the productive response of state enterprises was markedly different from that of private firms--private firms outperformed state enterprises (just as anecdotal evidence suggested). Size also matters, at least among private firms. Generally, there seem to be increasing returns to scale for private firms, except for very large enterprises (many of which were previously state-owned and may need further restructuring). The fact that size does not appear to matter among public enterprises suggests that several of them have not yet adopted optimal technologies and production processes.Banks&Banking Reform,Municipal Financial Management,Labor Policies,Environmental Economics&Policies,Economic Theory&Research,Environmental Economics&Policies,Banks&Banking Reform,Municipal Financial Management,Economic Theory&Research,Health Monitoring&Evaluation
The Hurst Parameter For Digital Signature Of Network Segment
No full textThis paper presents results of the Hurst parameter for digital signature of network segments. It's also presented a model for digital signature automatic generation which aims at the characterization of traffic in network segments. The use of the digital signature allows the manager to: identify limitations and crucial points of the network; establish the real use of network resources; better control the use of resources and the establishment of thresholds for the generation of more accurate and intelligent alarms which suit the real network characteristics. The obtained results validate the experiment and show in practice significant advantages in networks management. © Springer-Verlag 2004.3124772781Barford, P., Kline, J., Plonka, D., Ron, A., A signal analysis of network traffic anomalies, Internet Measurement Workshop (2002) Proceedings of the Second ACM SIGCOMM Workshop on Internet Measurement, , Marseille, ISBN:1-58113-603-XThottan, M., Ji, C., Anomaly detection in IP networks (2003) Signal Processing, IEEE Transactions on, 51 (8). , AugPapavassiliou, S., Pace, M., Zawadzki, A., Ho, L., Implementing enhanced network maintenance for transaction access services: Tools and applications, Communications, 2000. ICC 2000 (2000) IEEE International Conference on, 1. , JuneHajji, H., Baselining network traffic and online faults detectionCommunications, 2003 (2003) ICC '03. IEEE International Conference on, 1. , 11-15 May(2002) Stephen, NOVAK Judy. Network Intrusion Detection, Third Edition, , New RidersQin, X., Lee, W., Lewis, L., Cabrera, J.B.D., Integrating intrusion detection and network management (2002) Network Operations and Management Symposium, 2002, , NOMS 2002. 2002IEEE/IFIP, 15-19 AprilFerramenta Para Auxflio No Gerenciamento Backbone Automatizado, , http://proenca.uel.br/gba/(28/04/2004), Available by Web inhttp://people.ee.ethz.ch/~oetiker/webtools/mrtg/, The Multi Router Traffic Graphcr (MRTG), Disponíbel por WWW em 26/10/2002 no endereçoRueda, A., KinsnerA survey of traffic characterization techniques in telecommunication networks, Electrical and Computer Engineering, 1996 (1996) Canadian Conference on, 2, pp. 830-833. , 26-29 May Vol.2Adas, A., Traffic models in broadband networks, Communications Magazine (1997) IEEE, 35 (7), pp. 82-89. , JulManagement Information Base for Network Management of TCP/IP-based internets: MIB-II (1991) RFC, 1213. , marLemes Jr., M., Uma Experiência de Gerenciamento de Rede com Backbone ATM através da Ferramenta GBA XIX Simpósio Brasileiro de Telecomunicações - SBrT 2001, , Fortaleza 03-06/09/2001Martin, B.J., Altman Douglas, G., Statistical Methods for Assessing Agreement between Two Methods of Clinical Measurement (1986) The LANCET, 1, pp. 307-310Bussab Wilton, O., (2003) Morettin Pedro A. Estatística Básica, Editora Saraiva, 5a EdiçãoAthanasios Pillai, S., (2002) Unnikrishna. Probability, Random Variables and Stochastic Processes, Fourth Edition, , McGraw-HillLeland Will, E., Taqqu, M.S., Willinger, W., Wilson, D.V., On the Self-Similar Nature of Ethernet Traffic (Extended Version) (1994) IEEE/ACM Transactions on Networking, 2 (1). , Februar
[Review of] E. San Juan, Jr. From Exile to Diaspora: Versions of the Filipino Experience in the U.S.
Get PDFThe author has written an excellent summary of the little known events in Filipino history in the Philippines and the history of the Filipino community in the U.S., a history of over four hundred years that covers the colonial oppression, and resistance first to Spain and then the United States. He attributes the fractured Filipino identity, one that is fissured by ambivalence, opportunism, and schizoid loyalties, to the colonial experiences under these two western European powers. In his brilliant analysis of the literature he uses a historical materialist theoretical framework (22)
International Riprap workshop, theory, policy and practice of erosion control using riprap, armour stone and rubble
No full textJ. Aguirre-Pe, R. Fuentes - Stability and weak motion of riprap at a channel bed A.F. Ahmed, F. EI-Gamal, M.M. Gasser - Deterministic and probabilistic design approaches of riprap as bank protection J.P. Ahrens - Design considerations for dynamic revetments G.J. Akkerman, E. Berendsen - Experimental validation of stability criteria for the design of rockfil/ closure dams N.W.H. Allsop - Stability of rock armour and riprap on coastal structures K.J. Bakker, M.B. de Groot, H.J. Verheij - A simple design relation for geometrie open filters in bed protections F.B.J. Barends - Geotechnical stability of riprap structures N.G. Bhowmik - Evaluation and utilization of biotechnical techniques and wil/ow posts for stabilizing eroding streambanks R.E.A.M. Boeters, F.C.M. van der Knaap, H.J. Verheij - Behaviour of armour layers of riprap bank protections along navigation channels K. Bruxvoort - Use of the 1991 Corps of Engineers riprap design procedure in mine reclamation F.W. Chamberlin, M.S. Meyers - A case study of the use of riprap in Rochester, Minnesota B.A. Christensen - Optimum design of riprap protected trapezoidal channels A.J. Combe, C.W. Solleau - Mississippi River - Gulf -Outlet, tests of riprap bank stabilization E.A. Dardeau Jr, K.J. KlIIgore Jr, A.C. Mlller - Using riprap to create or improve riverine habitat M.L. Dove - Standardized riprap gradations K.K. Duskaev - Principles of stone stability and the probability of stone break A. EI-Fiky, A. EI-Mongy, A.M. Talaat, M.M. Anwar - Wave energy dissipation by composite breakwater A.A. EI-Sayad, E.A. Abdel-Hafiez, A.M. Talaat - Effect of flow on riprap protected beds A. Franken, R.E. Jorissen, H.E. Klatter - Design ru/es for the use of riprap in closure works V.J. Galay, M. Zaki Abo EI Fotouh, M. EI Moattassem - Pilot project for bank proteetion along the river Nile D.H. Gray, R.D. Hryciw - Biotechnical stabilization of coastal landforms M.B. de Groot, J. Lindenberg - Pore pressures in riprap structures due to non-stationary loads M.B. de Groot, P. Meijers - Wave induced sliding of revetments D.J. Hagerty, A.C. Parola - Seepage effects in riprap armored embankments J. Haltiner - Environmentally sensitive approaches to river channel management F. Heezen - Risk analysis of a closure design: A case study J.E. Hite - Design, repair, and rehabilitatiqn of scour protection. Downstream from Inland. Navigation dam stilling basins J. van 't Hoft, M. Lindo, W.H. Tutuarima - Construction aspects of rock structures R.E. Jorissen, D.P. de Wilde, E. Berendsen - Design of the bed protection of the Rotterdam storm surge barrier G.J. Laan - Quality and quality control of stone for hydraulic structures R.J. Larson, G.A. Nicholson- Durability index for protection stone: A concept J.P. Latham, G.G. Gauss - The drop test for armourstone integrityKWP-collectio
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