1. Introduction and Overview. 2. Detecting Influential Observations and Outliers. 3. Detecting and Assessing Collinearity. 4. Applications and Remedies. 5. Research Issues and Directions for Extensions. Bibliography. Author Index. Subject Index.

Regression Diagnostics: Identifying Influential Data and Sources of Collinearity

物件導向軟體之架構(Object-Oriented Software Construction)探討

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A Break in the Clouds: Towards a Cloud Definition

[서평]「The Unified Modeling Language User Guide」

The Object Management Group's (OMG) Model Driven Architecture (MDA) strategy envisages a world where models play a more direct role in software production, being amenable to manipulation and transformation by machine. Model Driven Engineering (MDE) is wider in scope than MDA. MDE combines process and analysis with architecture. This article sets out a framework for model driven engineering, which can be used as a point of reference for activity in this area. It proposes an organisation of the modelling 'space' and how to locate models in that space. It discusses different kinds of mappings between models. It explains why process and architecture are tightly connected. It discusses the importance and nature of tools. It identifies the need for defining families of languages and transformations, and for developing techniques for generating/configuring tools from such definitions. It concludes with a call to align metamodelling with formal language engineering techniques.

Model Driven Engineering

Detection and classification of retinal lesions for grading of diabetic retinopathy

This research work deals with the modeling and control of a hybrid photovoltaic (PV)-Wind micro-grid using Quasi Z-source inverter (QZsi). This inverter has major benefits as it provides better buck/boost characteristics, can regulate the phase angle output, has less harmonic contents, does not require the filter and has high power performance characteristics over the conventional inverter. A single ended primary inductance converter (SEPIC) module used as DC-DC switched power apparatus is employed for maximum power point tracking (MPPT) functions which provide high voltage gain throughout the process. Moreover, a modified power ratio variable step (MPRVS) based perturb & observe (P&O) method has been proposed, as part of the PV MPPT action, which forces the operating point close to the maximum power point (MPP). The proposed controller effectively correlates with the hybrid PV, Wind and battery system and provides integration of distributed generation (DG) with loads under varying operating conditions. The proposed standalone micro grid system is applicable specifically in rural places. The dSPACE real-time hardware platform has been employed to test the proposed micro grid system under varying wind speed, solar irradiation, load cutting and removing conditions etc. The experimental results based on a real-time digital platform, under dynamic conditions, justify the performance of a hybrid PV-Wind micro-grid with Quasi Z-Source inverter topology.

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Hybrid PV-Wind Micro-Grid Development Using Quasi-Z-Source Inverter Modeling and Control –Experimental Investigation

Code cloning refers to the duplication of source code. It is the most common way of reusing source code in software development. If a bug is identified in one segment of code, all the similar segments need to be checked for the same bug. Consequently, this cloning process may lead to bug propagation that significantly affects the maintenance cost. By considering this problem, code clone detection (CCD) appears as an active area of research. Consequently, there is a strong need to investigate the latest techniques, trends, and tools in the domain of CCD. Therefore, in this paper, we comprehensively inspect the latest tools and techniques utilized for the detection of code clones. Particularly, a systematic literature review (SLR) is performed to select and investigate 54 studies pertaining to CCD. Consequently, six categories are defined to incorporate the selected studies as per relevance, i.e., textual approaches (12), lexical approaches (8), tree-based approaches (3), metric-based approaches (7), semantic approaches (7), and hybrid approaches (17). We identified and analyzed 26 CCD tools, i.e., 13 existing and 13 proposed/developed. Moreover, 62 open-source subject systems whose source code is utilized for the CCD are presented. It is concluded that there exist several studies to detect type1, type2, type3, and type4 clones individually. However, there is a need to develop novel approaches with complete tool support in order to detect all four types of clones collectively. Furthermore, it is also required to introduce more approaches to simplify the development of a program dependency graph (PDG) while dealing with the detection of the type4 clones.

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A Systematic Review on Code Clone Detection

Security in today’s world is one of the important challenges that people are facing all over the world in every aspect of their lives. Similarly security in electronic world has a great significance. In this paper, we survey the security of database. This is an area of substantial interest in database because we know that, the use of database is becoming very important in today’s enterprise and databases contains information that is major enterprise asset. This survey was conducted to identify the issues and threats in database security, requirements of database security, and how encryption is used at different levels to provide the security. General Terms Your general terms must be any term which can be used for general classification of the submitted material such as Pattern Recognition, Security, Algorithms et. al. Keywords Database, Security, Encryption, Access Control. 1. INTRODUCTION We ask that authors follow some simple guidelines. In essence, we ask you to make your paper look exactly like this document. The easiest way to do this is simply to download the template, and replace the content with your own material. Information or data is a valuable asset in any organization. Almost all organization whether social, governmental, educational etc., have now automated their information systems and other operational functions. They have maintained the databases that contain the crucial information. So database security is a serious concern. To go further, we shall first discuss what actually the database security is? Protecting the confidential/sensitive data stored in a repository is actually the database security. It deals with making database secure from any form of illegal access or threat at any level. Database security demands permitting or prohibiting user actions on the database and the objects inside it. Organizations that are running successfully demand the confidentiality of their database. They do not allow the unauthorized access to their data/information. And they also demand the assurance that their data is protected against any malicious or accidental modification. Data protection and confidentiality are the security concerns. Figure 1 below shows the properties of database security that are: confidentiality, integrity and availability [6][7][8]. As discussed previously confidentiality imposes limits while retrieving the secure data and therefore averting the illegal access to the data. Integrity means that the data will not be tainted in any way. Availability of data on time is the property of secure databases. [1][5] There are four types of controls mentioned by Denning [1] to obtain the database protection, those includes: access control, information flow control, cryptographic flow control and inference control. Confidentiality

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Database Security and Encryption: A Survey Study

Requirements Elicitation phase in Requirements Engineering (RE) is found to be very complex and demands more attention when software development is performed on the global scale. The available approaches of requirements elicitation require vigilant application in different scenarios of GSD and may need further improvement when considering challenges of distributed development. In this paper, a comprehensive survey of requirements elicitation approaches and challenges is performed which describes the limitations in applying the current elicitation approaches in GSD scenarios. Considering these constraints, an iterative framework for elicitation (IRE) in Requirements engineering is proposed. The case study analysis of the proposed model shows the effectiveness of iterative approach. The results show that IRE approach is more effective in satisfying the customer requirements than existing elicitation approaches.

Farooque Azam

Papers

Detection and classification of retinal lesions for grading of diabetic retinopathy

Hybrid PV-Wind Micro-Grid Development Using Quasi-Z-Source Inverter Modeling and Control –Experimental Investigation

A Systematic Review on Code Clone Detection

Database Security and Encryption: A Survey Study

An iterative approach for global requirements elicitation: A case study analysis