排序方式： 共有43条查询结果，搜索用时 31 毫秒
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Fatemeh Sheikhshoaei Nader Naghshineh Sirous Alidousti Maryam Nakhoda Hossein Dehdarirad 《Library & information science research》2021,43(3):101101
Development of a digital library demands extensive financial, human, and technological investments. Appropriate models and measurement tools are required to achieve the goals of these libraries to assess them. This research was conducted with the aim of developing and validating a tool to measure the maturity of a digital library based on the “digital library maturity model” (DLMM). Two sources including literature and experts' opinion were used to determine the criteria for each code. Expert opinion and confirmatory factor analysis were used to confirm the content and construct validity of the developed tool, respectively. The reliability of the designed tool was examined by the Cronbach's alpha test. Finally, the designed tool validity and reliability were confirmed. Managers of digital libraries can use this tool to understand the maturity level of their digital libraries and plan to improve the library or to attain advanced levels of maturity. 相似文献
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We summarize a recently developed microtechnology for printing biomaterials on biological surfaces. The technique is based on the use of immiscible aqueous solutions of two biopolymers and allows spatially defined placement of cells and biomolecules suspended in the denser aqueous phase on existing cell layers and extracellular matrix hydrogel surfaces maintained in the second phase. Printing takes place due to an extremely small interfacial tension and density difference between the two aqueous phases. The contact-free printing process ensures that both printed cells and the underlying cell monolayer maintain full viability and functionality. The technique accommodates both arbitrarily shaped patterns and microarrays of cells and bioreagents. The capability to print cells and small molecules on existing cell layers enables unique interrogations of the effects of cell-cell and cell-material interaction on cell fate and function. Furthermore, the very gentle conditions and the ability to directly pattern nongel embedded cells over cells make this technology appealing to tissue engineering applications where patterned multicellar organization with minimal scaffolding materials is needed, such as in dense tissues of the skeletal muscle and liver. 相似文献
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Mohammad Hossein Heydari 《Journal of The Franklin Institute》2018,355(12):4970-4995
In this paper, a new direct method based on the Chebyshev cardinal functions is proposed to solve a class of variable-order fractional optimal control problems (V-OFOCPs). To this end, a new operational matrix (OM) of variable-order (V-O) fractional derivative in the Caputo sense is derived for these basis functions and is used to obtain an approximate solution for the problem under study. In the proposed method, the state and the control variables are expanded in terms of the Chebyshev cardinal functions with unknown coefficients, at first. Then, the OM of V-O fractional derivative and some properties of the Chebyshev cardinal functions are employed to achieve a nonlinear algebraic equation corresponding to the performance index and a nonlinear system of algebraic equations corresponding to the dynamical system in terms of the unknown coefficients. Finally, the method of constrained extremum is applied, which consists of adjoining the constraint equations derived from the given dynamical system and the initial conditions to the performance index by a set of undetermined Lagrange multipliers. As a result, the necessary conditions of optimality are derived as a system of algebraic equations in the unknown coefficients of the state variable, control variable, and Lagrange multipliers. Furthermore, some numerical examples of different types are demonstrated with their approximate solutions for confirming the high accuracy and applicability of the proposed method. 相似文献
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Reza Gharibi Amir Hossein Rasekh Mohammad Hadi Sadreddini Seyed Mostafa Fakhrahmad 《Information processing & management》2018,54(6):1058-1076
Bug reports are an essential part of a software project's life cycle since resolving them improves the project's quality. When a new bug report is received, developers usually need to reproduce the bug and perform code review to locate the bug and assign it to be fixed. However, the huge number of bug reports and the increasing size of software projects make this process tedious and time-consuming. To solve this issue, bug localization techniques try to rank all the source files of a project with respect to how likely they are to contain a bug. This process reduces the search space of source files and helps developers to find relevant source files quicker. In this paper, we propose a multi-component bug localization approach that leverages different textual properties of bug reports and source files as well as the relations between previously fixed bug reports and a newly received one. Our approach uses information retrieval, textual matching, stack trace analysis, and multi-label classification to improve the performance of bug localization. We evaluate the performance of the proposed approach on three open source software projects (i.e., AspectJ, SWT, and ZXing) and the results show that it can rank appropriate source files for more than 52% of bugs by recommending only one source file and 78% by recommending ten files. It also improves the MRR and MAP values compared to several existing state-of-the-art bug localization approaches. 相似文献
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Aboulqasem Sharifzadeh Gholam Hossein Abdollahzadeh Mahnoosh Sharifi 《The Journal of Agricultural Education and Extension》2013,19(1):57-68
Abstract Capacity Development is needed in the Iranian Agricultural System. Integrating Information and Communication Technologies (ICTs) in the agricultural research system is an appropriate capacity development mechanism. The appropriate application of ICTs and information such as a National Agricultural Information System requires a systemically developed strategic plan, based on identifying and recognizing system-wide organizational implications. In this regard, this paper focuses on the implications of integrating ICTs in the Iranian agricultural research system. To this aim, the authors conducted a survey research study using qualitative analysis of interview data from a select sample of agricultural researchers and agricultural faculty members. After designing an interview protocol and doing interviews with the select sample of agricultural researchers and faculty members (n = 29), a qualitative procedure was used to analyze the data, based on conceptual extraction and thematic categorization of statements. Categories included guidelines, expected outcomes, challenges and barriers of appropriate ICTs integration in the Iranian agricultural research system. In addition, different phases of the ICTs integration process were identified in the form of a pathway diagram. Finally, based on related Iranian lessons learned, which are explained in this research, some appropriate mechanisms for integrating ICTs in national agricultural research system were indicated. 相似文献
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Hossein Saiedian 《Computer Science Education》2013,23(1):109-132
Industrial software development today requires a fundamental education in computer science as well as the ability to work productively and collaboratively in a team environment. Employers will therefore favor graduates who have mastered computer science and software engineering concepts and can apply them while developing a software system. To produce computer science graduates possessing the skills necessary to succeed in the workplace, team‐oriented software engineering courses with real projects (and with real clients) are increasingly emphasized. It is, however, difficult to successfully present a software engineering course that covers software engineering concepts and offers opportunities to apply them during a project in a team environment. The difficulties lie in project selection, team formation, team and project organization, process management, and, finally, grading. The objective of this article is to discuss these difficulties and provide suggestions for alleviating or avoiding them. 相似文献