Client-server Implementation Research Articles

Simulation of distributed network elements in CAS MAXIMA and server online calculations in the educational process

Pressure pipelines are an important part of the water management infrastructure. Water supply networks pump the liquid to the consumer with the help of pumps (or supply it from a water tower) to specified points. The functioning of the entire urban infrastructure depends on the correct calculation and reliable operation of these areas. This paper shows the implementation of a computer calculation of one of the branched network options using numerical methods in the CAS MAXIMA computer algebra system, its graphic subsystem of symbolic mathematics, and the use of the author's online calculation program with a client-server implementation - https://www.k123.org.ua/jgIHjob1.html .
 The implementation of elements of computer calculations in the educational process allows the generation of an unlimited number of individual variants of initial data. The implementation of computer calculation requires the availability of automatic online generation of answers for each stage of iterative calculations. The task of generating online answers is the basis of the program development.
 An educational online platform is offered for researching the optimality of numerical, graphic and audio formats for setting the problem. The formats of the web form for entering output data have been studied. Online calculations reduce the time spent on typical monotonous operations. Additional possibilities of instant online calculations and visual graphic visualization of calculation results expand the possibilities of modeling individual elements of a branched network.
 The online program allows you to use computer calculations, expand the culture of using applied mathematical methods for engineering calculations, introduce algorithms and data structures, and solve the main task of training future engineers - to ensure a modern level of education and readiness to solve new problems.

Random Segmentation: New Traffic Obfuscation against Packet-Size-Based Side-Channel Attacks

Despite encryption, the packet size is still visible, enabling observers to infer private information in the Internet of Things (IoT) environment (e.g., IoT device identification). Packet padding obfuscates packet-length characteristics with a high data overhead because it relies on adding noise to the data. This paper proposes a more data-efficient approach that randomizes packet sizes without adding noise. We achieve this by splitting large TCP segments into random-sized chunks; hence, the packet length distribution is obfuscated without adding noise data. Our client–server implementation using TCP sockets demonstrates the feasibility of our approach at the application level. We realize our packet size control by adjusting two local socket-programming parameters. First, we enable the TCP_NODELAY option to send out each packet with our specified length. Second, we downsize the sending buffer to prevent the sender from pushing out more data than can be received, which could disable our control of the packet sizes. We simulate our defense on a network trace of four IoT devices and show a reduction in device classification accuracy from 98% to 63%, close to random guessing. Meanwhile, the real-world data transmission experiments show that the added latency is reasonable, less than 21%, while the added packet header overhead is only about 5%.

API как способ взаимодействия с социальными сетями

In the realities of the pandemic, chat bots have become indispensable helpers. They do not need a lot of resources and constant human control. A method of interacting with social networks through a specialized software interface Web API, which is the basis of the REST architecture, is considered. The basic structure of requests for receiving and sending data to servers is presented. On the example of the implementation of a chatbot for vk.com, capable of automating a dialogue with users, the main design stages are presented, including the requirements for the implementation and operation mode based on the client-server architecture, implementation and testing. The project server is implemented on a Raspberry Pi4 single-board computer. Demonstrated code for performing basic queries and implemented a Long Polling approach to continuously track and distribute user messages. Methods were formed to obtain the necessary resources from the server, to declare a new resource on the server, to update information on the server, and to delete certain objects from the database. The result was a patented software product "Intelligent assistant of VSUIT for social networks".

IPv6 for the Evolution of the Network of the Special Astrophysical Observatory of the Russian Academy of Sciences

Abstract—Requirements to a modern computer network of a research organization, in particular, to the local-area network of the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS) are described. The choice of the direction of the development of primary tools for supporting the observing process and based on local network infrastructure services of SAO RAS is defined. This will make it easier to automate the administration of the network, prevent the effect of human factor on its reliability, and facilitate its maintenance. The low-rank structure of the network based on high-performance Ethernet commutators is justified. The viability of the use of the sixths-series IPv6 protocols instead of or in addition to IPv4 protocols for mostly unmanned network administration minimizing errors of manual mode. An evolution of a multiplatform network using promising IPv6-supported technologies ensuring implementation of a practically self-tuning configuration. The methods of a client-server implementation of the main network services of the observatory are described.

Anonymous Broadcast Messages

The Dining Cryptographer network (or DC-net) is a privacy preserving communication protocol devised by David Chaum for anonymous message publication. A very attractive feature of DC-nets is the strength of its security, which is inherent in the protocol and is not dependent on other schemes, like encryption. Unfortunately the DC-net protocol has a level of complexity that causes it to suffer from exceptional communication overhead and implementation difficulty that precludes its use in many real-world use-cases. We have designed and created a DC-net implementation that uses a pure client-server model, which successfully avoids much of the complexity inherent in the DC-net protocol. We describe the theory of DC-nets and our pure client-server implementation, as well as the compromises that were made to reduce the protocol’s level of complexity. Discussion centers around the details of our implementation of DC-net.

Risk Factors in Enterprise-Wide/ERP Projects

The purpose of this study was to identify the risk factors in implementing traditional management information systems projects, describe the risk factors associated with enterprise-wide/ERP (enterprise resource planning) projects and identify the risk factors in ERP projects which are unique to these projects. Some of the unique challenges in managing enterprise-wide projects which were highlighted through the findings included the challenge of re-engineering business processes to ‘fit’ the process which the ERP software supports, investment in recruiting and reskilling technology professionals, the challenge of using external consultants and integrating their application-specific knowledge and technical expertise with existing teams, the risk of technological bottlenecks through client-server implementation and the challenge of recruiting and retaining business analysts who combine technology and business skills.

Optimal Entropy Encoders For Mining MultiplyResolved Data

A prototype client-server implementation of image analysis and compression is described which is based on the recently developed theory of Cohen, Dahmen, DeVore, and Daubechies for optimal entropy data encoders. The class of algorithms resulting from this theory was developed for the analysis and synthesis of data and yields optimal (in an information-theoretic sense), progressive, universal encoders for purposes of compression, storage, and transmission of data which can be developed into a multi-resolution framework. Such data include photographic and sensor images, digital terrain maps, and multidimensional scientific data generated by computational simulators. Two versions of the tree encoder have been implemented with a common client interface in order to demonstrate the applicability to diverse model problems. The first version processes the raw data in real time and is designed for relatively small data sets on single machines. The second version is designed as a network application to efficiently navigate archived data residing on remote databanks. Data structures which contain summary statistics, indexing and threading information generated by the analysis stage of the algorithm are utilized to navigate the data at adaptively-determined levels of resolution based upon the local depth of detail requested by the client application. Data Mining II, C.A. Brebbia & N.F.F. Ebecken (Editors) © 2000 WIT Press, www.witpress.com, ISBN 1-85312-821-X

Client-server implementation: some management pointers

Using a sample of 350 companies, this paper investigates the benefits of client-server systems and links them to a set of implementation factors. The paper reveals that companies can expect competitive, operational, financial and technical benefits. It reports several important steps, activities and tasks that are positively related to those benefits, including defining clear organizational objectives and strategies, re-organizing corporate data and testing multiple levels of clients and servers. Furthermore, they list some of the problems that companies may encounter during a client-server implementation. The paper is relevant to managers and academicians who want to better understand the implementation of client-server.

DeepMatrix – An open technology based virtual environment system

In this paper we present DeepMatrix, a shared 3D virtual environment system based on two open technologies, Java and the Virtual Reality Modeling Language (VRML). The system is designed for use on current consumer hardware and requires only a standard Web browser with VRML plug-in. Due to a lean client-server implementation, system performance is superior to comparable approaches and easily extensible. This paper also introduces authoring for DeepMatrix environments and discusses results drawn from a large experimental implementation of widely varying and interconnected virtual worlds.

A prototype computational fluid dynamics case study in Java

Java offers the benefits of portability, object orientation, graphical interface components, multithreading and distributed programming capability. However, for numerically intensive technical applications, performance of non-native code can be critical. This paper evaluates the Java platform on the basis of code development capability and performance by contrasting several implementations of a transonic small disturbance equation solver. The use of the abstract windowing toolkit, native methods and a client–server implementation are documented herein. © 1997 John Wiley & Sons, Ltd.

Client-server technology meets operational-planning challenges

Utilities must be able to develop IT tools fast enough to address today's emerging business needs, such as open transmission access, real-time pricing, etc. This article describes a client-server implementation launched at Tennessee Valley Authority (TVA) in 1994 to meet the utility's operational-planning needs. The article summarises some of the lessons learned and outlines future development plans.