WWW Server Research Articles

Wireless Measurement of Carbon Dioxide by use of IQRF Technology

The paper focuses on the design and implementation of a comprehensive monitoring system that allows long-term monitoring of selected environmental quantities especially in the interior of buildings and visualizing them using modern SW tools. The measured quantities in this case include CO2 concentration, temperature, humidity and atmospheric pressure. The sensor part of the system uses Figaro CDM7160, Bosch BME280 and Microchip MCP9802 sensors. The IQMESH network is based on the advanced IQRF wireless technology that allows coverage of vast areas with the wireless monitoring system. Measured data from individual measurement modules is sent using Raspberry Pi or via commercial Internet gateways to native IQRF cloud storage. From there, it is forwarded through a script to a MySQL database running on the university www server, which subsequently provides for processing and visualization using the Grafana SW system.

Universal model for collective access patterns in the Internet traffic dynamics: A superstatistical approach

We suggest a universal phenomenological description for the collective access patterns in the Internet traffic dynamics both at local and wide area network levels that takes into account erratic fluctuations imposed by cooperative user behaviour. Our description is based on the superstatistical approach and leads to the q-exponential inter-session time and session size distributions that are also in perfect agreement with empirical observations. The validity of the proposed description is confirmed explicitly by the analysis of complete 10-day traffic traces from the WIDE backbone link and from the local campus area network downlink from the Internet Service Provider. Remarkably, the same functional forms have been observed in the historic access patterns from single WWW servers. The suggested approach effectively accounts for the complex interplay of both “calm” and “bursty” user access patterns within a single-model setting. It also provides average sojourn time estimates with reasonable accuracy, as indicated by the queuing system performance simulation, this way largely overcoming the failure of Poisson modelling of the Internet traffic dynamics.

WeBIAS: a web server for publishing bioinformatics applications.

BackgroundOne of the requirements for a successful scientific tool is its availability. Developing a functional web service, however, is usually considered a mundane and ungratifying task, and quite often neglected. When publishing bioinformatic applications, such attitude puts additional burden on the reviewers who have to cope with poorly designed interfaces in order to assess quality of presented methods, as well as impairs actual usefulness to the scientific community at large.ResultsIn this note we present WeBIAS—a simple, self-contained solution to make command-line programs accessible through web forms. It comprises a web portal capable of serving several applications and backend schedulers which carry out computations. The server handles user registration and authentication, stores queries and results, and provides a convenient administrator interface. WeBIAS is implemented in Python and available under GNU Affero General Public License. It has been developed and tested on GNU/Linux compatible platforms covering a vast majority of operational WWW servers. Since it is written in pure Python, it should be easy to deploy also on all other platforms supporting Python (e.g. Windows, Mac OS X). Documentation and source code, as well as a demonstration site are available at http://bioinfo.imdik.pan.pl/webias.ConclusionsWeBIAS has been designed specifically with ease of installation and deployment of services in mind. Setting up a simple application requires minimal effort, yet it is possible to create visually appealing, feature-rich interfaces for query submission and presentation of results.

An Educational HTTP Proxy Server

The efficiency and safety of Web access can be enhanced by the deployment of an http proxy server in many cases. The first part of this paper provides an introduction to the issue of an HTTP proxy server. The second part of the paper describes used technologies and an implementation of a multithreaded HTTP proxy server with an embedded WWW server used for the graphics user interface. In its current state, the developed proxy server can be used to monitor the WWW traffic of a local area network and, with further development of its functionalities, can include such areas as content filtering or access control.

Clustering Algorithms in Hybrid Recommender System on MovieLens Data

Abstract Decisions are taken by humans very often during professional as well as leisure activities. It is particularly evident during surfing the Internet: selecting web sites to explore, choosing needed information in search engine results or deciding which product to buy in an on-line store. Recommender systems are electronic applications, the aim of which is to support humans in this decision making process. They are widely used in many applications: adaptive WWW servers, e-learning, music and video preferences, internet stores etc. In on-line solutions, such as e-shops or libraries, the aim of recommendations is to show customers the products which they are probably interested in. As input data the following are taken: shopping basket archives, ratings of the products or servers log files. The article presents a solution of recommender system which helps users to select an interesting product. The system analyses data from other customers' ratings of the products. It uses clustering methods to find similarities among the users and proposed techniques to identify users' profiles. The system was implemented in Apache Mahout environment and tested on a movie database. Selected similarity measures are based on: Euclidean distance, cosine as well as correlation coefficient and loglikehood function.

ConnectionScore: a statistical technique to resist application-layer DDoS attacks

In an application-layer distributed denial of service (DDoS) attack, zombie machines send a large number of legitimate requests to the victim server. Since these requests have legitimate formats and are sent through normal TCP connections, intrusion detection systems cannot detect them. In these attacks, an adversary does not saturate the bandwidth of the victim server through inbound traffic, but through outbound traffic. The next aim of the adversary is to consume and exhaust computational resources (e.g., CPU cycles), memory resources, TCP/IP stack, resources of input/output devices, etc. This paper proposes a novel scheme which is called ConnectionScore to resist such DDoS attacks. During the attack time, any connection is scored based on history and statistical analysis which has been done during the normal condition. The bottleneck resources are retaken from those connections which take lower scores. Our analysis shows that connections established by the adversary give low scores. In fact, the ConnectionScore technique can estimate legitimacy of connections with high probability. The rate of suspicious connections being dropped is adjusted based on the current level of overload of the server and a threshold-level of free resources. To evaluate the performance of the scheme, we perform experiments in the Emulab environment using real traceroute data of the ClarkNet WWW server ( http://ita.ee.lbl.gov/html/contrib/ClarkNet-HTTP.html ).

Tackling Application-layer DDoS Attacks

In application-layer distributed denial of service (DDoS) attacks, zombie machines attack the victim server through legitimate packets such that packets havelegitimate format and are sent through normal TCP connections. Consequently, neither intrusion detection systems (IDS) nor victim server can detects malicious packets. This paper proposes a novel scheme which is called ConnectionScore to resist against such DDoS attacks. During the attack time, anyconnection is scored based on history and statistical analysis which has been done during the normal condition. The bottleneck resources are retaken from those connections which take lower scores. Our analysis shows that connections established by the adversary give low scores. In fact, ConnectionScore technique can estimate legitimacy of connections with high probability.Toevaluate performanceofthe scheme,weperformexperimentson Emulabenvironmentusingreal traceroute data of ClarkNet WWW server.

Performance Study of a Distributed Web Server: An Analytical Approach

With the rapid expansion of the Internet, Web servers have played a major role in accessing the enormous mass of Web pages to find the information needed by the user. Despite the exponential growth of the WWW, a very negligible amount of research has been conducted in Web server performance analysis with a view to improve the time a Web server takes to connect, receive, and analyze a request sent by the client and then sending the answer back to client. In this paper, we propose a multi-layer analytical approach to study the web server performance. A simple client-server model is used to represent the WWW server in order to demonstrate how to apply the proposed approach. We developed a systematic, analytical methodology to quantify the communication delay and queuing overhead in a distributed web server system. The approach uses the Computation Structure Model to derive server processing time required to process a request sent from a client and queueing model to analyze the communication between the clients and the server.

Remote Monitoring and Diagnosis System of Rolling Mill Based on CORBA and SOAP/Web Service Technology

A detailed solution to the remote monitoring and diagnosis system for a rolling mill is introduced. The hardware and software structure of remote monitoring and diagnosis system is presented. The structure of the system is made up of four subsystems, namely online monitoring subsystem, data servo subsystem, database service subsystem and www server subsystem. Software module of system includes seven parts, namely online monitoring module, data query module, fault information query module, trend analysis module, diagnosis analysis module, engineer station module and eigenvalue query module. The system adopts B/S model and integrates CORBA technology with SOAP/Web Service technology. It makes dynamic display and traversing for a great deal of on-line data and Firewall traversal possible. It has run a long time that proves that the system interface is friendly and easy to use. It has better security, good portability, expandability and stability. It can judge the running-condition of a rolling mill in real time.

P1-77 Mathematical and agent-based analyses upon epidemiological diversity of the incidence of 2009 novel H1N1 flu (H1N1) among school children within and among small regional communities, Saitama, Japan

IntroductionWe examined the epidemiological diversity on the incidence of H1N1 within and among small regional communities using surveillance data and agent-based simulations.MethodsWe investigated 27 elementary and junior high schools in...

Comparison between normal and TOR-anonymized web client traffic

TOR is known free tool for traffic anonymization on the Internet. The adverse aspect of using TOR is significant increase of overhead and decrease of the traffic speed. So far no study focusing the quantification of such decrease was published. TOR operation is based on “routing” the traffic through several nodes resulting in difficult and practically impossible direct calculation of the delay caused by TOR application. Therefore the study was performed to quantify the delay associated with using TOR comparing ordinary traffic. Www was used as a model of Internet traffic. The sample of 14 stable www pages and 8-10 files available via http throughout the world was chosen and the round-trip time was measured approx. 10 times both with TOR (at least in two configurations, first automatic and the second manually modified) and without TOR. For manual TOR measurement two onion routers were configured in two locations. Measurements were made in various days of week and various times to eliminate possible fluctuations due to varying traffic target www servers. The main result of the study is that the factor of roundtrip time increase varies between 2 and more than 100. In case of configured TOR networks the ratio is lower but still high,1.7 and 34. This is quite rough result that is shown in details in the article. The results show that TOR is useful anonymization tool but the delay caused by its use is enormous. Providing of more exact estimations would require more measurements however.

A general retrial system with additional vacation

This paper studies a retrial system with batch arrival and general retrial time, where the server may take an additional vacation after the essential vacation. In this system, primary customers arrive according to Poisson processes and receive corresponding service immediately if the server is available upon arrival. When the server is busy or on vacation, arriving customers enter a retrial orbit. If the orbit is empty, the server immediately leaves for the essential vacation. At the end of essential vacation, he may take one additional vacation. It is assumed that the retrial time and service time are all arbitrary distributed. This retrial system has potential applications in the packet-switched networks and the proxy of WWW server. By applying the supplementary variable technique, some important performance measures are derived, which may be useful for network system designers and software system engineers.

Nucleocytoplasmic Shuttling of Dysbindin-1, a Schizophrenia-related Protein, Regulates Synapsin I Expression

Dysbindin-1 is a 50-kDa coiled-coil-containing protein encoded by the gene DTNBP1 (dystrobrevin-binding protein 1), a candidate genetic factor for schizophrenia. Genetic variations in this gene confer a susceptibility to schizophrenia through a decreased expression of dysbindin-1. It was reported that dysbindin-1 regulates the expression of presynaptic proteins and the release of neurotransmitters. However, the precise functions of dysbindin-1 are largely unknown. Here, we show that dysbindin-1 is a novel nucleocytoplasmic shuttling protein and translocated to the nucleus upon treatment with leptomycin B, an inhibitor of exportin-1/CRM1-mediated nuclear export. Dysbindin-1 harbors a functional nuclear export signal necessary for its nuclear export, and the nucleocytoplasmic shuttling of dysbindin-1 affects its regulation of synapsin I expression. In brains of sandy mice, a dysbindin-1-null strain that displays abnormal behaviors related to schizophrenia, the protein and mRNA levels of synapsin I are decreased. These findings demonstrate that the nucleocytoplasmic shuttling of dysbindin-1 regulates synapsin I expression and thus may be involved in the pathogenesis of schizophrenia.

MIPS: curated databases and comprehensive secondary data resources in 2010

The Munich Information Center for Protein Sequences (MIPS at the Helmholtz Center for Environmental Health, Neuherberg, Germany) has many years of experience in providing annotated collections of biological data. Selected data sets of high relevance, such as model genomes, are subjected to careful manual curation, while the bulk of high-throughput data is annotated by automatic means. High-quality reference resources developed in the past and still actively maintained include Saccharomyces cerevisiae, Neurospora crassa and Arabidopsis thaliana genome databases as well as several protein interaction data sets (MPACT, MPPI and CORUM). More recent projects are PhenomiR, the database on microRNA-related phenotypes, and MIPS PlantsDB for integrative and comparative plant genome research. The interlinked resources SIMAP and PEDANT provide homology relationships as well as up-to-date and consistent annotation for 38 000 000 protein sequences. PPLIPS and CCancer are versatile tools for proteomics and functional genomics interfacing to a database of compilations from gene lists extracted from literature. A novel literature-mining tool, EXCERBT, gives access to structured information on classified relations between genes, proteins, phenotypes and diseases extracted from Medline abstracts by semantic analysis. All databases described here, as well as the detailed descriptions of our projects can be accessed through the MIPS WWW server (http://mips.helmholtz-muenchen.de).

G1300-1-1 ものづくりセンター支援システムの構築([G1300-1]生産加工・工作機械部門一般講演)

Manufacturing Center was started in Yamagata University since 2010. The system that supported the existing Machine Factory was restructured, the support system for the Manufacturing Center was developed in this research. The support system consists of the reservation system and the submission system to apply when user handles machine. The system is providing service by HTML on the www server. In this research, the system was programmed with PHP, and the database was built by MySQL. The utilization, the administration, and the management of the Manufacturing Center became more convenient by this system.

Comparison between normal and TOR-Anonymized Web Client Traffic

TOR is known free tool for traffic anonymization on the Internet. The adverse aspect of using TOR is significant increase of overhead and decrease of the traffic speed. So far no study focusing the quantification of such decrease was published. TOR operation is based on “routing” the traffic through several nodes resulting in difficult and practically impossible direct calculation of the delay caused by TOR application. The study was performed to quantify the delay associated with using TOR comparing ordinary traffic. The sample of 14 stable www pages and 8-10 files available via http was chosen and the round-trip time was measured approx. 10 times both with TOR (at least in two configurations, first automatic and the second manually modified) and without TOR. For manual TOR measurement two onion routers were configured in two locations. Measurements were made in various days of week and various times to eliminate possible fluctuations due to varying traffic target www servers. The main result of the study is that the factor of round-trip time increase varies between 2 and more than 100. In case of configured TOR networks the ratio is lower but still high, from 1.7 to 34. This is rough result that is shown in the article. Results show that TOR is useful anonymization tool but the delay due to TOR use is huge. More exact estimations would require more measurements. © 2010 Published by Elsevier Ltd.

Modified vacation policy for M/G/1 retrial queue with balking and feedback

This paper studies a general retrial queue with balking and Bernoulli feedback, where the server operates a modified vacation policy. If the server is busy or on vacation, an arriving customer either enters an orbit with probability b, or balks (does not enter) with probability 1 − b. Otherwise the service of the arriving customer commences immediately. At any service completion epoch, the test customer may either enter the orbit for another service with probability p or leave the system with probability 1 − p. If the orbit is empty, the server takes at most J vacations until at least one customer is recorded in the orbit when the server returns from a vacation. This retrial system has potential applications in e-mail system and WWW server. By applying the supplementary variable technique, some important performance measures are derived. The effect of various retrial/vacation time distributions and different values of J on the system performance measures is also investigated. The analyses and results presented in this paper may be useful for network system designers and software system engineers.

Embedded WWW Server in Wireless Sensor Networks

Abstract In the paper the embedded WWW server in Wireless Sensor Networks is presented. Such dedicated WWW server runs in a mote and present data in a user-friendly form. User specifies his interests in web browser and receives as an answer a web page. This simplifies data presentation for not experienced users. In Wireless Sensor Network there may be placed multiple servers running at motes connected to a constant energy supply. This may also be used for process supervising and controlling.

Computer-assisted uncertainty assessment of k0-NAA measurement results

In quantifying measurement uncertainty of measurement results obtained by the k 0-based neutron activation analysis ( k 0-NAA), a number of parameters should be considered and appropriately combined in deriving the final budget. To facilitate this process, a program ERON (ERror propagatiON) was developed, which computes uncertainty propagation factors from the relevant formulae and calculates the combined uncertainty. The program calculates uncertainty of the final result—mass fraction of an element in the measured sample—taking into account the relevant neutron flux parameters such as α and f, including their uncertainties. Nuclear parameters and their uncertainties are taken from the IUPAC database (V.P. Kolotov and F. De Corte, Compilation of k 0 and related data for NAA). Furthermore, the program allows for uncertainty calculations of the measured parameters needed in k 0-NAA: α (determined with either the Cd-ratio or the Cd-covered multi-monitor method), f (using the Cd-ratio or the bare method), Q 0 (using the Cd-ratio or internal comparator method) and k 0 (using the Cd-ratio, internal comparator or the Cd subtraction method). The results of calculations can be printed or exported to text or MS Excel format for further analysis. Special care was taken to make the calculation engine portable by having possibility of its incorporation into other applications (e.g., DLL and WWW server). Theoretical basis and the program are described in detail, and typical results obtained under real measurement conditions are presented.

Um projeto na Internet para obter uma harmonização dos curricula

The increase of student mobility in Europe and in other countries, and the recent attempt to harmonise European curricula at the graduation and post-graduation levels lead towards an increasing co-operation among universities to develop educational modules with a common background (Ruffio, 2000). This paper describes a project developed in the framework of a European Thematic Network. The educational modules developed are installed in a WWW server and can be accessed by students and teachers. Results obtained through a pilot course in three different countries are presented and suggestions concerning course improvement are given in order to build a virtual university