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Nackil Sung 《资料收集管理》2020,45(3):195-207
AbstractA DDA (Demand Driven Acquisitions) preferred Approval Plan allows libraries to acquire DDA eligible books triggered by users. Non-DDA books are acquired automatically, because there is no mechanism that allows these books to be requested by users. This study explores the procedure called Purchase by Request (PBR) that allows non-DDA books to be discoverable and requested by users. After incorporating both DDA and PBR into an Approval Plan, all books in the Approval Plan are exposed to users for just-in-time purchases, and in the process saving the library a substantial amount of money. 相似文献
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With the advances in natural language processing (NLP) techniques and the need to deliver more fine-grained information or answers than a set of documents, various QA techniques have been developed corresponding to different question and answer types. A comprehensive QA system must be able to incorporate individual QA techniques as they are developed and integrate their functionality to maximize the system’s overall capability in handling increasingly diverse types of questions. To this end, a new QA method was developed to learn strategies for determining module invocation sequences and boosting answer weights for different types of questions. In this article, we examine the roles and effects of the answer verification and weight boosting method, which is the main core of the automatically generated strategy-driven QA framework, in comparison with a strategy-less, straightforward answer-merging approach and a strategy-driven but with manually constructed strategies. 相似文献
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The main contribution of this paper is to develop an adaptive output-feedback control approach for a class of uncertain nonlinear systems with unknown time-varying delays in the pure-feedback form. Both the non-affine nonlinear functions and the unknown time-varying delayed functions related to all state variables are considered. These conditions make the controller design difficult and challenging because the output-feedback controller should be designed using only the output information. In order to overcome these conditions, we design an observer-based adaptive dynamic surface controller where the time-delay effects are compensated by using appropriate Lyapunov–Krasovskii functionals and the function approximation technique using neural networks. A first-order filter is added to the control input to avoid the algebraic loop problem caused by the non-affine structure. It is proved that all the signals in the closed-loop system are semi-globally uniformly bounded and the tracking error converges to an adjustable neighborhood of the origin. 相似文献
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Students with specific poor comprehension (SPC) can sound out words accurately, but have difficulty understanding what they read. However, most existing reading intervention studies on students with reading disabilities did not differentiate students with SPC from other types of students with reading disabilities who accompany with decoding difficulties. The purpose of this systematic review was to synthesize findings from 14 experimental intervention studies that have included students with SPC with the goal of increasing reading comprehension. Out of eight types of interventions identified, Reciprocal Teaching (g = .856) demonstrated the largest effect size. Metalinguistic intervention showed the effect size of above .50 (a medium effect size), suggesting that intervention that explicitly teaches high-level oral language strategies was positive to improve reading performances of students with SPC. Findings also suggest a need to specify the classification criteria of students with SPC to broaden an understanding about the evidence-based intervention for students with SPC. Practical implications for effective practice, limitations, and future directions are discussed. 相似文献
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Mechanical properties and low cycle fatigue are two factors that must be considered in developing new type steel for shock
absorption. Process capability and process control are significant factors in achieving the purpose of research and development
programs. Often-used evaluation methods failed to measure process yield and process centering; so this paper uses Taguchi
loss function as basis to establish an evaluation method and the steps for assessing the quality of mechanical properties
and process control of an iron and steel manufacturer. The establishment of this method can serve the research and development
and manufacturing industry and lay a foundation in enhancing its process control ability to select better manufacturing processes
that are more reliable than decision making by using the other commonly used methods. 相似文献
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One difficult problem in information retrieval (IR) is the proper interpretation of user queries. It is extremely hard for users to express their information needs in a specific yet exhaustive way. In an effort to alleviate this problem, two theoretical models have been proposed to utilize user characteristics maintained in the form of a user profile. Although the idea of integrating user profiles into an IR system is intuitively appealing, and the models seem viable, no research to date has established a foundation for the roles of user profiles in such a system. Aiming at the investigation of the roles of user profiles, therefore, this study first identifies and extends various query/profile interaction models to provide a ground upon which the investigation can be undertaken. From a continuum of models characterized on the basis of interaction types, metrics, and parameters, nearly 400 models are chosen to investigate the “model space.” New measures are developed based on the notion of user satisfaction/frustration. In addition, three different criteria are used to guide users in making judgments on the quality of retrieved items. Analysis of the data obtained from the experiments shows that, for a wide variety of criteria and metrics, there are always some query/profile interaction models that outperform the query alone model. In addition, preferable characteristics for different criteria are identified in terms of interaction types, parameters, and metrics. 相似文献
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The Urban Review - Educational researchers and practitioners have cited the need for new directions in youth leadership studies as it relates to globalization. Globalization is considered one of... 相似文献