共查询到20条相似文献，搜索用时 31 毫秒
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《Microprocessing and Microprogramming》1994,40(10-12):807-810
In this paper we conduct a detailed performance analysis of four distinct member protocols from the Internet TCP/IP family, these being the user datagram protocol (UDP), transmission control protocol (TCP), the remote procedure call system (RPC) and data transmission aspects of the network file system (NFS). We discuss the trends in computer development which have led to the widespread use of distributed workstation environments interconnected by local area networks, the motivation for implementing parallel distributed programs on such systems and the impact that protocol-selection can have on the overall efficiency of such an application. 相似文献
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《Microprocessing and Microprogramming》1994,40(2-3):103-115
The Virtuoso programming system is a real-time programming framework that offers the same high level API across all target platforms from single processor to multiprocessor systems. A very fast nanokernel that manages a set of light context processes is at the heart of the system. These nanokernel processes combine the speed of an interrupt Service Routine with the flexibility of a task and reduce considerably the latency of the application. 相似文献
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《Microprocessing and Microprogramming》1995,41(4):315-330
User or program mobility in distributed computing systems is becoming increasingly significant in the modern community since users may change their working locations frequently. Job migration is supplementary to remote login in the support of user mobility. However, the migration facility is not a common feature in distributed systems yet. This is mainly due to the inherent complexity in implementing such a facility. This paper proposes a logical machine migration mechanism that can effectively support software environment migration. The basic idea behind logical machine migration is to migrate a logical machine, including the running processes and their execution environment, by a single mechanism. Thus most of the migration difficulties due to the dependency on the operating system kernel are eliminated. We have realized an experimental system, called DLMS386, which successfully demonstrates such idea. 相似文献
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Laura K. Clark 《Library & information science research》2017,39(2):107-115
A survey conducted at three Florida library systems examines caregivers' perceptions of emergent literacy programming and how these perceptions compare with the National Research Council's features for quality programs for children. The survey results reveal that caregivers' perceptions of emergent literacy programming align with the National Research Council's features. The data demonstrates that caregivers' perceptions are very positive toward emergent literacy programming in terms of learning and the environment. Caregivers' perceptions of the environment answers were mostly strongly agree. These results were more positive than their perceptions of learning, although they strongly agree that these programs prepare children for school, reading, and social interaction. The survey results will inform public libraries as to how to design, market, and deliver emergent literacy programming to caregivers with very young children. 相似文献
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《Communication methods and measures》2013,7(3):221-240
Memory plays a role in many communications theories; however, few studies consider individual differences in memory. The results are reported here for two original studies designed to reconstruct a previously validated measure for television memory constructed to assess how people forget information over time. The remote television memory test assesses recognition memory for the titles of broadcast television programs canceled after a single season. Results from two studies show that the measure is reliable across repeated administrations among independent samples, exhibits a forgetting curve over time, is uncorrelated with total television viewing, appears to be approximately normally distributed, and predicts social reality estimates typical of the cultivation effect independently from total viewing. More work is needed to further assess the construct validity of the measure. Practical implications of administration also are discussed. 相似文献
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Susan Mee Cheryl Herdklotz Anne Marie Canale 《Journal of Library & Information Services in Distance Learning》2019,13(1-2):74-87
Following in the same tradition of seamlessly providing access to library resources to our remote users, our campus has now taken the next logical step in also providing an orientation for new faculty teaching online as well as those teaching at our international campus locations. Without this type of orientation program, new faculty often feel isolated and left to navigate various systems, including library resources, the learning management system, student information systems, early alert tools, etc., completely on their own. Providing an orientation to this audience helps bring them together and allows them to acclimate to the various campus systems in an easier and much-less frustrating manner. 相似文献
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《图书馆管理杂志》2013,53(3-4):511-512
ABSTRACT The past ten years have seen remote access to electronic resources emerge as the preferred method of use for many, if not most, library patrons. Unfortunately, the misuse of the Internet has also led to a culture in which many personal computer users feel they must install accessory programs that complicate the normal processes associated with the retrieval of Web-based information. Various programs that users install, often with the best of intentions, can interfere with the authentication processes that many libraries and their vendors use. An exploration of firewalls, ad-blockers, pop-up blockers, Web accelerators, and similar software will examine the complications caused by popular programs in each category when users attempt remote access to library-provided information resources. Additional exploration will focus on similar complications experienced by users behind workplace firewalls. Discussion of each type of software will include minimally invasive remedies to recommend to users and suggestions for managing the technical support burden. Particular attention will focus on the interaction of firewalls and related software with popular remote access solutions such as EZproxy. Finally, analysis of this situation will include consideration of human factors, including suggested messages to convey to skeptical patrons and network administrators. 相似文献
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Process mining techniques have already been studied in a wide range of sectors, revealing useful information on the processes. In this study, a five-step methodology is applied to an integrated library system (ILS) for the first time. Given two event logs from two different organizations the ILS, a process mining tool is used for process discovery and data analysis. The findings reveal that although both of the organizations were using the same system, there were differences in the activities, sequences, and approaches followed by each one in daily tasks. The results of this kind of analysis can be used to highlight best practices and improve processes. In addition process model comparisons can then be made across various systems and organizations. 相似文献
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《The Reference Librarian》2013,54(23):177-190
The delivery of library reference service can be practically supplemented through the appropriate incorporation and use of software tools commonly referred to as expert systems. The level of support such systems can afford the reference service organization is dependent on the degree of complexity characteristic of the rule-based programming techniques used to develop a particular system and the size of its knowledge database. Since most expert systems are designed to simulate the process of problem-solving practiced by an expert in a given field, an expert system designed to fully emulate library reference work must have the potential to respond to a wide subject range of questions with varying degrees of response adequacy. The widespread development of expert systems with this type of potential is limited due to the tremendous personnel and hardware costs currently associated in the design and application of systems of this size. Most locations utilizing some form of reference expert system have applied a compromised, more cost-efficient approach in this area. The following describes a micro-computer-based reference expert-type system that has emerged due to this needed compromise. 相似文献
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《Microprocessing and Microprogramming》1994,40(6):427-438
A classical approach for achieving fault tolerance in distributed systems is based on the incorporation of efficient and fault tolerant procedures for checkpointing and recovery in such systems. We propose two checkpointing procedures, which can be initiated by any process in the system or upon failure of one or more component processes. Our procedures return the most recent and consistent checkpoints for the processes initiating the procedure, and do not interfere with the progress of the distributed system application. Furthermore, our procedures guarantee that a consistent checkpoint will be obtained when they terminate. Examples illustrating the application of the procedures are also provided. 相似文献
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BioSYNTHESIS is a prototype intelligent retrieval system under development as part of the IAIMS project at Georgetown University. The aim is to create an integrated system that can retrieve information located on disparate computer systems. The project work has been divided in two phases: BioSYNTHESIS I, development of a single menu to access various databases which reside on different computers; and BioSYNTHESIS II, development of a search component that facilitates complex searching for the user. BioSYNTHESIS II will accept a user's query and conduct a search for appropriate information in the IAIMS databases at Georgetown. For information not available at Georgetown, such as full text, it will access selected remote systems and translate the search query as appropriate for the target system. The search through various computer systems and different databases with unique storage and retrieval structures will be transparent to the user. BioSYNTHESIS I is complete and available to users. The design work for BioSYNTHESIS II is under development and will continue as a multiyear technical research effort of the proposed Georgetown IAIMS implementation project. 相似文献
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《Journal of Media Economics》2013,26(2):123-142
This article explores an important trend in German TV stations: the introduction and steady advancement of management control (MC) systems. Most publications aim at transferring MC theory to TV without explicit definition of the TV production function, thus this article describes the TV core processes (production, programming, sale, and promotion) to which MC is applied. The results from a full census among controllers of German TV stations about participation, instruments, and problems of MC in their companies are presented and interpreted. The results suggest that the level of MC is high only among top-rated commercial stations. Controllers in German TV stations mainly manage the planning and budgeting systems, but also act increasingly as internal consultants for program management. The dominant problems appear to be the establishment and acceptance of MC as well as methodical difficulties of TV accounting. The MC systems of public and commercial stations reflect the different business missions and systems. 相似文献
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F W Roper 《Bulletin of the Medical Library Association》1974,62(4):405-412
This final report compares career characteristics of former trainees employed in medical libraries in 1971 with those of another group of professional medical librarians who did not enter medical librarianship from special training programs. Career characteristics include career advancement (position level, number of people supervised, salary level), professional utilization (tasks performed), and professional activity (association memberships and offices, number of journals read, continuing education activity). The comparison of characteristics for the two groups showed many similarities. A major difference appeared in the career advancement comparison. For the former trainees, economic advancement seems less dependent on upward movement in line positions. This suggests the possibility of two career tracks available to them. 相似文献
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Shibboleth在省级科技文献共享平台中的应用 总被引：1，自引：0，他引：1
在对Shibboleth的整体结构框架、各个子组件的功能、系统内相关通讯协议等展开研究和分析的基础上,构建了用于共享平台中的实验认证系统,并对其进行了框架设计系统搭建,从而实现共享平台中跨域的、分布式远程用户单点认证。 相似文献
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异构分布式信息检索系统整合研究 总被引：2，自引：0，他引：2
实现异构处理器、异构数据源之间的共建共享,必须对分布式检索系统的各个子系统进行整合。现有的技术对于实现具体的、个别的分布式检索系统的互操作虽然没有问题,但要建立普遍意义的互操作规范,尚有一定难度。数据/语义层的互操作仍是异构分布式信息检索系统整合的重点,相关研究仍需深入。 相似文献
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开放数字信息服务体系:概念、结构与技术 总被引：16，自引：0，他引：16
开放数字信息服务体系 ,有其特定的概念、原则要求和功能框架。开放系统的开放描述基于扩展的元数据概念 ,信息系统通过开放语言和规范机制来实现对系统各层次内容的开放描述。分布服务机制源于分布对象技术 ,它将各种系统视为一个数字对象 ,对其界面、功能、数据流、传输协议等进行描述。开放体系的开放集成 ,包括横向和纵向开放集成 ,它们各有其技术线路。图 5。参考文献 2 9。 相似文献
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《Microprocessing and Microprogramming》1994,40(2-3):117-134
This paper extends the current analysis associated with static priority pre-emptive based scheduling to address the wider problem of analysing schedulability of a distributed hard real-time system; in particular it derives analysis for a distributed system where tasks with arbitrary deadlines communicate by message passing and shared data areas. A simple TDMA protocol is assumed, and analysis developed to bound not only the communications delays, but also the delays and overheads incurred when messages are processed by the protocol stack at the destination processor. The paper illustrates how a window-based analysis technique can be used to find the worst-case response times of a distributed task set. An extended example illustrating the application of the analysis is presented. 相似文献