129,207 research outputs found

    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed

    Dispelling the Myths Behind First-author Citation Counts

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    We conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more sophisticated methods

    A Hierarchical Control Plane Framework for Integrated SDN-SFC Management in Multi-tenant Cloud Datacenters

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    Cloud data centers represent one of the most complex and dynamic environments in terms of network management. The multitude of hosted applications in such centers share the same fabric and yet demand easy and fast service deployment and management of independent logical networks. Applications, often belonging to di erent tenants, have di erent needs in terms of performance, isolation, security, and tra c optimization based on which incoming and outgoing tra c is serviced. Traditionally, cloud service providers satisfy these requirements by means of purpose-built specialized hardware equipment providing network services called middleboxes. End-to-end delivery of services is realized by physically connecting the middleboxes in the required sequence called Service Function Chains (SFC), and steering tra c through them. However, the lack of extensibility and scalability of these closed systems hinders dynamic provisioning of services and leads to network ossi cation. With the emergence of Network Function Virtualization (NFV) where the service functions were implemented in software, and Software-De ned Networking (SDN) which enabled programmatic con guration of networks, the provisioning of di erentiated services was made easier. However, current SDN implementations have certain shortcomings with respect to SFC management. Most SDN control plane implementations handle the forwarding rule generation based on the L2/L3 layer's information. Also, SDN extensions for SFCs have exploited the central entity of control only to generate forwarding rules to stitch the service functions (SFs) to form SFCs. In cloud networks where application service requirements change dynamically, autonomous management of SFC is essential. This can be achieved only if the controller's view expands beyond the forwarding devices to include the SFs and SFCs. In the rst part of this work, we motivate the need for a central control plane that can handle SFC management along with packet forwarding. Current research mostly focuses on using the SDN controller solely to generate and install forwarding rules into the data plane to realize SFCs. SDN controllers deal with only the L2/L3 layers of the network stack. However, SFs often involve higher L4-L7 layer functionality. To e ectively manage the SFs through a centralized point of control, the controller must be able to understand the semantics of the higher layers. This means the controller must be aware of the functionality provided by the SFs and be capable of interpreting state information of SFs which involve the higher layer meta-data. This work highlights the need for a cooperative SDN-SFC control plane. We try to understand the challenges involved in realizing such a control plane by implementing an integrated controller based on POX which handles both tra c routing as well as SFC management. Among the challenges, the issue of controller scalability was visible. The impact of this integration on the scalability of the controller is captured by measuring the incoming tra c at the controller. The controller is evaluated over a simulated data center scale network. We present results showing an increase in load at the controller end. Also, results showing an increase in workload at the controller with an increase in the number of SFs in the network are presented. A workload characterization at the controller is experimentally derived to analyze the correlation of controller workload with the variability in SFC related components. In the second part of this work, we try to address the controller scalability issue by redesigning the controller. We propose a hierarchical integrated controller capable of absorbing the increased workload. The controller includes multiple instances of controllers arranged in a two-level hierarchy. The controller separates the control plane functionality across the two tiers and also across the controllers within the same tier such that only control messages required for building the network global view are handled by the higher tiers while those that handle tenant level information are managed by the lower layer instances. This framework organically supports multi-tenancy by providing the required tenant isolation through dedicated sub-controller instances. The controller also allows intelligent reuse of SFs and SFCs across tenants with consideration to the tenant isolation requirements. The hierarchical structure of the controller o ers the ability to adapt to expanding network sizes by absorbing the control state more e ciently at each tier. We evaluate our framework by comparing the load at the proposed controller, with that of centralized and distributed implementations of the integrated controller. We quantify and compare the packet loss metrics and the ow setup latencies of the di erent controllers by subjecting them to the same infrastructure and application deployment setup on a simulated network. Results show that the workload at each controller instance of the proposed controller is lower than its centralized and distributed counter-parts. Also, the percentage packet loss of the proposed controller is reduced by 20% and 10% in comparison to the centralized and distributed controllers. The observed ow setup latencies also indicate that the proposed hierarchical architecture performs better than the other two controller architectures in large multi-tenant networks. Finally, we characterize the workload at the proposed controller architecture and compare it with the characterization derived from the centralized controller

    Pragmatic Case Studies as a Source of Unity in Applied Psychology

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    To unify or not to unify applied psychology: that is the question. In this article we review pendulum swings in the historical efforts to answer this question—from a comprehensive, positivist, “top-down,” deductive yes between the 1930s and the early 60s, to a postmodern no since then. A rationale and proposal for a limited, “bottom-up,” inductive yes in applied psychology is then presented, employing a case-based paradigm that integrates both positivist and postmodern themes and components. This paradigm is labeled “pragmatic psychology” and, its specific use of case studies, the “Pragmatic Case Study Method” (“PCS Method”). We call for the creation of peer-reviewed journal-databases of pragmatic case studies as a foundational source of unifying applied knowledge in our discipline. As one example, the potential of the PCS Method for unifying different angles of theoretical regard is illustrated in an area of applied psychology, psychotherapy, via the case of Mrs. B. The article then turns to the broader historical and epistemological arguments for the unifying nature of the PCS Method in both applied and basic psychology.Peer reviewe

    Ecocritical Concerns in Lakshmi Kannan’s Short Stories “Muniyakka,” “Nandanvan,” and “Because”

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    The relationship between nature and mankind has been inextricable since time immemorial. Writers down the ages in almost all cultures of the world have presented nature in its splendour and beauty. Hence it becomes important to study how literature represents the essential human relationship with nature and also the role of nature as a nurturer. This paper attempts to examine how nature and environment appear as tropes in three short stories of Lakshmi Kannan namely “Muniyakka,” “Nandanvan,” and “Because.” These stories have been translated from Tamil into English by the author herself. The paper aims to highlight the ecocritical vein that runs through these selected short stories in the light of the theory of ecocriticism. Ecocriticism is an interdisciplinary study that aims at analysing texts that illustrate environmental concerns and it examines the various ways literature treats the subject of nature. The paper further argues that the relationship between nature and mankind is one of reciprocity

    Supplementary Material 1 - Supplemental material for Do Stringent Bankruptcy Laws Always Deter Entrepreneurial Activities? A Study of Cultural Influences

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    Supplemental material, Supplementary Material 1, for Do Stringent Bankruptcy Laws Always Deter Entrepreneurial Activities? A Study of Cultural Influences by Naga Lakshmi Damaraju, Jay B. Barney and Gregory G. Dess in Entrepreneurship Theory and Practice</p

    <b style=""> </b> <b style="font-size: 14pt;">Therapeutic potential of <i style="">Ganoderma lucidum </i>(Fr.) P. Karst.</b><i style=""> </i>

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    382-386Mushrooms represent a major and untapped source of potent new pharmaceutical products. The antioxidant, antiinflammatory, antinociceptive, antimutagenic, anticarcinogenic, antitumour, hepatoprotective, nephroprotective and cardioprotective activities of the methanolic extract of Ganoderma lucidum (Fr.) P. Karst. collected from tropical South India were&nbsp; evaluated for the revalidation of its utilization in Chinese folklore medicine. Review of results is presented in this paper.</b

    Dr. Edwin Wright Collection: Author Unknown

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    Notes - The author relates several short stories about his neighbours including Alex McDonell, homesteading and life around Meanook and Athabasca (1 page
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