Maintainability Of System Research Articles

A study of dealing class imbalance problem with machine learning methods for code smell severity detection using PCA-based feature selection technique

Detecting code smells may be highly helpful for reducing maintenance costs and raising source code quality. Code smells facilitate developers or researchers to understand several types of design flaws. Code smells with high severity can cause significant problems for the software and may cause challenges for the system's maintainability. It is quite essential to assess the severity of the code smells detected in software, as it prioritizes refactoring efforts. The class imbalance problem also further enhances the difficulties in code smell severity detection. In this study, four code smell severity datasets (Data class, God class, Feature envy, and Long method) are selected to detect code smell severity. In this work, an effort is made to address the issue of class imbalance, for which, the Synthetic Minority Oversampling Technique (SMOTE) class balancing technique is applied. Each dataset's relevant features are chosen using a feature selection technique based on principal component analysis. The severity of code smells is determined using five machine learning techniques: K-nearest neighbor, Random forest, Decision tree, Multi-layer Perceptron, and Logistic Regression. This study obtained the 0.99 severity accuracy score with the Random forest and Decision tree approach with the Long method code smell. The model's performance is compared based on its accuracy and three other performance measurements (Precision, Recall, and F-measure) to estimate severity classification models. The impact of performance is also compared and presented with and without applying SMOTE. The results obtained in the study are promising and can be beneficial for paving the way for further studies in this area.

Study on the posts and performance evaluation model of inpatients in public hospitals based on .NET platform DRGs payment mode

SummaryPerformance appraisal is a daily, homework, fair, and open appraisal of each hospital, which can mobilize the enthusiasm and creativity of the employees to the greatest extent so that both the company and the employees can achieve development. At present, the ascendant information revolution has become an important factor in promoting the development of the times. The use of advanced information technology to develop advanced information systems to conduct fair and open assessments of the ever‐increasing number of company employees has become the trend of the times. This article makes a historical review of the development and function of the performance appraisal system, and fully analyzes the new features and new functions of the performance appraisal system in the new period, and details the solution. This system develops and uses .NET development platform and SQL Server 2005 database. Using a distributed approach, the system's development costs have reduced, and the system's maintainability and scalability are improved. This paper studies the establishment of a performance‐based distribution model based on diagnostic relevance grouping theory (DRGs) in public hospitals. Based on the DRGs as a theoretical basis, after a long period of historical data collection, a theoretical model was established, repeated regression calculations, and focused evaluations. A performance‐distribution scheme centered on workload has established to reflect the factors such as the labor risk, technical difficulty, and labor cost of the attending doctors in relation to different patient conditions. The formulation and implementation of the new performance plan embodies the input of labor value and conforms to the spirit of the new medical reform.

Model Driven Development of Order Management Module for Software Visual Automation Service

This paper studies the application of model driven development technology in the development of order management module of visual automatic service. In view of the disadvantages of traditional software, such as low productivity, poor portability and difficult maintenance to the system, Model Driven Architecture (MDA) emerges as the times require. MDA can well overcome the drawbacks of the traditional software development described above. Platform, Independent, Model, Platform, Specific, Model, and code are the core of MDA. The method uses the use case diagram, class diagram and process blueprint of UML as the modeling language for the analysis and design of the system. This approach provides the basis for creating and transforming models in the system and generating code. The development experience shows that the model driven development technology adopted in this paper can effectively improve the efficiency of development and improve the system's maintainability and other major quality characteristics.

A Maintenance Policy Model Based on Time-Variant Reliability

A maintenance policy model based on time-variant reliability is put forward upon those mechanical systems which can carry on multiple maintenance in the whole life period, and the recurrence relations of the preventive maintenance intervals and reliability benefits is established. Two kinds of devices, one device’s mean time to failure complies with exponential distribution and another device’s mean time to failure meets the Weibull distribution, are taken as examples to get the approximate function expressions of the system's maintainability parameters of these devices through the curve fitting for data, analyze the system’s maintainability parameters and get the equipment’s maintenance policy model based on time-variant reliability. Examples verify the feasibility of the model.

Study of the Bit Key Technology in the Airborne Measurement and Control System

BIT is a new technology about the system test, fault diagnosing and separating. It is more important in the design for the reliability and main tainability of system. The key technique, such as the fault tree and equation, the test location, the test signal picking and generating, the fault distinguish rule, the design of preventing error alarm and BIT software. The result showed that the key technology is useful, and the reliability, maintainability and ability of management to fault can be increased by means of BIT. The debugging of system becomes convenient. The method can be used in the system of intelligent-in-strument and industrial control computer.

유사도 기반의 웹 어플리케이션 구조 복잡도

Abstract Software complexity is used to evaluate a target system's maint ainability. The existing complexity metrics on web applications are count-based, so it is hard to incorporate the understandability of developers or maintainers. To make up for this shortcomings, entropy-theory can be applied to define complexity, however, it is assumed that information quantity of each paper is identical. In this paper, structural complexity of a w eb application is defined based on information theory and similarity. In detail, the proposed comp lexity is defined using entropy as the previous approach, but the information quantity of individu al pages is defined using similarity. That is, a page which are similar with many pages has smaller i nformation quantity than a page which are dissimilar to others. Furthermore, various similarity measures can be used for various views, which results in many-sided complexity measures. Finally , several complexity properties are applied to verify the proposed metric and case studies shows th e applicability of the metric.▸Keyword:웹 어플리케이션(web application), 복잡도(complexity), 유사도(similar ity)∙제1저자 : 정우성 교신저자 : 이은주∙투고일 : 2010. 05. 02, 심사일 : 2010. 05. 18, 게재확정일 : 2010. 05. 30.* 서울대학교 공과대핟 컴퓨터공학부 박사과정 ** 경북대학교 IT대학 컴퓨터학부 조교수※ 이 논문은 2007년도 정부(교육과학기술부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업 연구임(NRF-2007-331-D00407)

Clustering for Monitoring Software Systems Maintainability Evolution

This paper presents ongoing work on using data mining clustering to support the evaluation of software systems' maintainability. As input for our analysis we employ software measurement data extracted from Java source code. We propose a two-steps clustering process which facilitates the assessment of a system's maintainability at first, and subsequently an in-cluster analysis in order to study the evolution of each cluster as the system's versions pass by. The process is evaluated on Apache Geronimo, a J2EE 1.4 open source Application Server. The evaluation involves analyzing several versions of this software system in order to assess its evolution and maintainability over time. The paper concludes with directions for future work.

Iterative reengineering of legacy systems

During its life, a legacy system is subjected to many maintenance activities, which cause degradation of the quality of the system: When this degradation exceeds a critical threshold, the legacy system needs to be reengineered. In order to preserve the asset represented by the legacy system, the familiarity with it gained by the system's maintainers and users, and the continuity of execution of current operations during the reengineering process, the system needs to be reengineered gradually. Moreover, each program needs to be reengineered within a short period of time. The paper proposes a reengineering process model, which is applied to an in-use legacy system to confirm that the process satisfies previous requirements and to measure its effectiveness. The reengineered system replaced the legacy one to the satisfaction of all the stakeholders; the reengineering process also had a satisfactory impact on the quality of the system. Finally, this paper contributes to validate the cause-effect relationship between the reengineering process and overcoming the aging symptoms of a software system.

No. 1 EAX Maintainability

The importance and objectives of maintainability to a telephone switching system are reviewed. Design approaches involving system structure, components, application software, and maintenance software are discussed. The basic elements of the system's maintainability: malfunction detection, retry, unit isolation, system recovery, fault localization, repair, and preventative maintenance are described. The layout of the repair manual is also presented.