Analysis of Technique to Extract Data from the Web for Improved Performance

WoTPubSub: A Web of Things Middleware with Publish Subscribe Functionality for Enabling Lightweight and Efficient Standard Web Access on Constrained Device

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.l3899.1081219 ◽

2019 ◽

Vol 8 (12) ◽

pp. 1194-1200

Keyword(s):

Performance Testing ◽

Machine To Machine ◽

Web Of Things ◽

Web Architecture ◽

Web Access ◽

Efficient Machine ◽

Improved Performance ◽

And Performance ◽

Web Platform ◽

The Web

The web platform can be seen as an auspicious candidate to provide an interoperability layer in an IoT based system with various kind of device specification and client platform leading to the transformation from IoT to WoT (Web of Things). In order to implement web platform on IoT world, we require a web compatible middleware yet still maintaining lightweight and efficient machine-to-machine (M2M) communications. In this paper we propose the web of things (WoT) middleware with publish subscribe functionality or WoTPubSub. As opposed to the existing solution, this middleware offers the utilization of lightweight MQTT protocol to perform a communication with constrained device while still maintaining the compatibility with existing web architecture. The proposed system consists of three actors: the user as Restful HTTP client, the sensing-actuating constrained device as both MQTT publisher-subscriber and the proposed middleware acting as communication bridge which translates user's HTTP request into MQTT publish-subscribe action. We consider two data flow scenarios in the proposed middleware: user obtaining data from sensing device and user giving a command to actuating device. From functional and performance testing, we conclude that the proposed middleware has been able to provide a web compatible intermediary functionality between user and sensing-actuating constrained device with improved performance compared to the existing approaches.

Download Full-text

Leverage Label and Word Embedding for Semantic Sparse Web Service Discovery

Mathematical Problems in Engineering ◽

10.1155/2020/5670215 ◽

2020 ◽

Vol 2020 ◽

pp. 1-8 ◽

Cited By ~ 2

Author(s):

Chengai Sun ◽

Liangyu Lv ◽

Gang Tian ◽

Qibo Wang ◽

Xiaoning Zhang ◽

...

Keyword(s):

Web Services ◽

Web Service ◽

Hierarchical Models ◽

Service Discovery ◽

Topic Model ◽

External Information ◽

Service Description ◽

Web Service Discovery ◽

Improved Performance ◽

The Web

Information retrieval-based Web service discovery approach suffers from the semantic sparsity problem caused by lacking of statistical information when the Web services are described in short texts. To handle this problem, external information is often utilized to improve the discovery performance. Inspired by this, we propose a novel Web service discovery approach based on a neural topic model and leveraging Web service labels. More specifically, words in Web services are mapped into continuous embeddings, and labels are integrated by a neural topic model simultaneously for embodying external semantics of the Web service description. Based on the topic model, the services are interpreted into hierarchical models for building a service querying and ranking model. Extensive experiments on several datasets demonstrated that the proposed approach achieves improved performance in terms of F-measure. The results also suggest that leveraging external information is useful for semantic sparse Web service discovery.

Download Full-text

Improved Performance by Combining Web Pre-Fetching Using Clustering with Web Caching Based on SVM Learning Method

International Journal of Computers Communications & Control ◽

10.15837/ijccc.2016.2.897 ◽

2016 ◽

Vol 11 (2) ◽

pp. 67

Author(s):

Kuttuva Rajendran Baskaran ◽

Chellan Kalaiarasan

Keyword(s):

Real Data ◽

Web Caching ◽

Learning Method ◽

Bandwidth Utilization ◽

Replacement Method ◽

Web Objects ◽

Improved Performance ◽

Prefetching Technique ◽

Origin Server ◽

The Web

Combining Web caching and Web pre-fetching results in improving the bandwidth utilization, reducing the load on the origin server and reducing the delay incurred in accessing information. Web pre-fetching is the process of fetching the Web objects from the origin server which has more likelihood of being used in future. The fetched contents are stored in the cache. Web caching is the process of storing the popular objects ”closer” to the user so that they can be retrieved faster. In the literature many interesting works have been carried out separately for Web caching and Web pre-fetching. In this work, clustering technique is used for pre-fetching and SVM-LRU technique forWeb caching and the performance is measured in terms of Hit Ratio (HR) and Byte Hit Ratio (BHR). With the help of real data, it is demonstrated that the above approach is superior to the method of combining clustering based prefetching technique with traditional LRU page replacement method for Web caching.

Download Full-text

Resource Management Scheme Based on Ubiquitous Data Analysis

The Scientific World JOURNAL ◽

10.1155/2014/156083 ◽

2014 ◽

Vol 2014 ◽

pp. 1-11

Author(s):

Heung Ki Lee ◽

Jaehee Jung ◽

Gangman Yi

Keyword(s):

Resource Management ◽

Process Management ◽

Web Server ◽

Main Memory ◽

Memory Space ◽

Management Scheme ◽

Server Systems ◽

Improved Performance ◽

Server System ◽

The Web

Resource management of the main memory and process handler is critical to enhancing the system performance of a web server. Owing to the transaction delay time that affects incoming requests from web clients, web server systems utilize several web processes to anticipate future requests. This procedure is able to decrease the web generation time because there are enough processes to handle the incoming requests from web browsers. However, inefficient process management results in low service quality for the web server system. Proper pregenerated process mechanisms are required for dealing with the clients’ requests. Unfortunately, it is difficult to predict how many requests a web server system is going to receive. If a web server system builds too many web processes, it wastes a considerable amount of memory space, and thus performance is reduced. We propose an adaptive web process manager scheme based on the analysis of web log mining. In the proposed scheme, the number of web processes is controlled through prediction of incoming requests, and accordingly, the web process management scheme consumes the least possible web transaction resources. In experiments, real web trace data were used to prove the improved performance of the proposed scheme.

Download Full-text

Toward The Simultaneous Correction of Spherical and Chromatic Aberration in Electron Optics by Means of an Electrostatic Electron Mirror

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100179786 ◽

1990 ◽

Vol 48 (1) ◽

pp. 206-207

Author(s):

Gertrude. F. Rempfer

Keyword(s):

Chromatic Aberration ◽

Transverse Magnetic ◽

Objective Lens ◽

Ion Imaging ◽

Corrected Image ◽

Electric And Magnetic Fields ◽

Chromatic Aberrations ◽

Improved Performance ◽

Electron Microscopes ◽

Image Planes

Optimum performance in electron and ion imaging instruments, such as electron microscopes and probe-forming instruments, in most cases depends on a compromise either between imaging errors due to spherical and chromatic aberrations and the diffraction error or between the imaging errors and the current in the image. These compromises result in the use of very small angular apertures. Reducing the spherical and chromatic aberration coefficients would permit the use of larger apertures with resulting improved performance, granted that other problems such as incorrect operation of the instrument or spurious disturbances do not interfere. One approach to correcting aberrations which has been investigated extensively is through the use of multipole electric and magnetic fields. Another approach involves the use of foil windows. However, a practical system for correcting spherical and chromatic aberration is not yet available.Our approach to correction of spherical and chromatic aberration makes use of an electrostatic electron mirror. Early studies of the properties of electron mirrors were done by Recknagel. More recently my colleagues and I have studied the properties of the hyperbolic electron mirror as a function of the ratio of accelerating voltage to mirror voltage. The spherical and chromatic aberration coefficients of the mirror are of opposite sign (overcorrected) from those of electron lenses (undercorrected). This important property invites one to find a way to incorporate a correcting mirror in an electron microscope. Unfortunately, the parts of the beam heading toward and away from the mirror must be separated. A transverse magnetic field can separate the beams, but in general the deflection aberrations degrade the image. The key to avoiding the detrimental effects of deflection aberrations is to have deflections take place at image planes. Our separating system is shown in Fig. 1. Deflections take place at the separating magnet and also at two additional magnetic deflectors. The uncorrected magnified image formed by the objective lens is focused in the first deflector, and relay lenses transfer the image to the separating magnet. The interface lens and the hyperbolic mirror acting in zoom fashion return the corrected image to the separating magnet, and the second set of relay lenses transfers the image to the final deflector, where the beam is deflected onto the projection axis.

Download Full-text