Miracle-dz/UniFAR-FTUs huggingface dataset:
Methods And Metrics For Measuring The Success Of Enterprise Social Software - What We Can Learn From Practice And Vice Versa

With Enterprise Social Software (ESS) being increasingly used for internal communication and collaboration, an important question is how their success can be measured. In this paper we contribute to answering this question by investigating which methods and metrics organizations are currently applying for measuring ESS success. To do so, we have conducted 26 interviews with persons responsible for the deployment and use of ESS in their company. We found that measuring ESS success in the studied companies mainly focuses on the analysis of usage. We attribute this to the f act that ESS is primarily characterized by an abundance of user-generated content that can be easily analyzed. At the same time, companies still face difficulties in the evaluation of the business value of the platforms. We attribute this to some characteristics of ESS that we will discuss in this paper. O ur study is supposed to provide a comprehensive overview of the methods and metrics applied in practice t o measure ESS success.
Mixing bandits: a recipe for improved cold-start recommendations in a social network

Recommending items to new or "cold-start" users is a challenging problem for recommender systems. Collaborative filtering approaches fail when the preference history of users is not available. A promising direction that has been explored recently [12] is to utilize the information in the social networks of users to improve the quality of cold-start recommendations. That is, given that users are part of a social network, a new user shows up in the network with no preference history and limited social links, the recommender system tries to learn the user's tastes as fast as possible. In this work, we model the learning of preferences of cold-start users using multi-armed bandits [5] embedded in a social network. We propose two novel strategies leveraging neighborhood estimates to improve the learning rate of bandits for cold-start users. Our first strategy, MixPair, combines estimates from pairs of neighboring bandits. It extends the well-known UCB1 algorithm [5] and inherits its asymptotically optimal guarantees. Although our second strategy, MixNeigh, is a heuristic based on consensus in the neighborhood of a user, it performed the best among the evaluated strategies. Our experiments on a dataset from Last.fm show that our strategies yield significant improvements, learning 2 to 5 times faster than our baseline, UCB1.
Distributed Verification of Structural Controllability for Linear Time-Invariant Systems

Motivated by the development and deployment of large-scale dynamical systems, often composed of geographically distributed smaller subsystems, we address the problem of verifying their controllability in a distributed manner. In this work we study controllability in the structural system theoretic sense, structural controllability. In other words, instead of focusing on a specific numerical system realization, we provide guarantees for equivalence classes of linear time-invariant systems on the basis of their structural sparsity patterns, i.e., location of zero/nonzero entries in the plant matrices. To this end, we first propose several necessary and/or sufficient conditions to ensure structural controllability of the overall system, on the basis of the structural patterns of the subsystems and their interconnections. The proposed verification criteria are shown to be efficiently implementable (i.e., with polynomial time complexity in the number of the state variables and inputs) in two important subclasses of interconnected dynamical systems: similar (i.e., every subsystem has the same structure), and serial (i.e., every subsystem outputs to at most one other subsystem). Secondly, we provide a distributed algorithm to verify structural controllability for interconnected dynamical systems. The proposed distributed algorithm is efficient and implementable at the subsystem level; the algorithm is iterative, based on communication among (physically) interconnected subsystems, and requires only local model and interconnection knowledge at each subsystem.
The pattern of accretion flow on to Sgr A

The material accreting on to Sgr A* most probably comes from the nearby stars. We analyse the pattern of this flow at distances of a fraction of a parsec, and we argue that the net angular momentum of this material is low but non-negligible, and the initially supersonic disc accretion changes into subsonic flow with constant angular momentum. Next, we estimate the flow parameters at a distance R BHL from the black hole, and we argue that for the plausible parameter range the accretion flow is non-stationary. The inflow becomes supersonic at a distance of ∼10 4 R g , but the solution does not continue below the horizon and the material piles up forming a torus, or a ring, at a distance of a few, up to tens of Schwarzchild, radii. Such a torus is known to be unstable and may explain strong variability of the flow in Sgr A*. Our considerations show that the temporary formation of such a torus seems to be unavoidable. Our best-fitting model predicts a rather large accretion rate of around 4 x 10 -6 M ⊙ yr -1 directly on Sgr A*. We argue that magnetic fields in the flow are tangled, and this allows our model to overcome the disagreement with the Faraday rotation limits.
Primary Market Design : Mechanisms And When-Issued Markets ∗

We analyse the pricing and allocation of unseasoned securities by means of mechanisms such as auctions or bookbuilding. Our analysis allows for the pricing and allocation rules to be based not only on investors’ bids, but also on information revealed through pre-issue trading of the securities in a when-issued or betting market. The results explain why mechanisms for pricing equity securities typically allow information from pre-issue markets to affect the issue price, while those for pricing Treasuries do not.
Why do I contribute when I am an “insider”? A moderated mediation approach to perceived insider status and employee’s innovative behavior

Purpose The relationship between perceived insider status (PIS) and innovative behavior may be mediated by felt obligation. Then the relationship between felt obligation and innovative behavior may be moderated by job stress. At last, felt obligation may conditional mediate the relationship between PIS and innovative behavior when job stress at different level. The purpose of this paper is to test these hypotheses. Design/methodology/approach The authors tested the moderated mediation model with data from a sample of 529 supervisor-subordinate dyads from the People’s Republic of China. Employees were asked to evaluate their PIS, felt obligation, and job stress when in the workplace. Their innovative behavior was evaluated by their immediate supervisors. Findings Results suggest that PIS is positively related to employee’s innovative behavior, and felt obligation mediates this relationship. In addition, job stress moderates two stage relationships: one is to moderate the relationship between felt obligation and innovative behavior; the other is to moderate the whole mediation model. Practical implications In China, managers can treat some employees as family members and support them when they are in trouble so that the employees will perceive insider status. Let employees get the feeling of PIS maybe a good way to motivate them to contribute to the organization. In addition, managers should reduce the work load of some employees who are expected to be innovative. Then those employees will have much more spare time to engage in innovative behavior. Originality/value This research sheds light on the relationship between PIS and innovative behavior in a non-western context by testing the mediating mechanism guided by role identity and appropriateness framework, which is a way different from social exchange process.
Spatially modulated communication method using dual scatterers for wireless power transmission

A novel spatially modulated communication method with electrically controlled dual scatterers has been proposed for wireless power transmission systems. Electromagnetic wave interference produced by the scatterers forms the spatial modulation, whose precise mechanism has been successfully formulated using the array factor theory. The scatterers are formed by lumped-element embedded miniature antennas, which are short-circuit terminated. One of those scatterers includes an integrated voltage-controlled varactor for changing the array factor. For a frequency range from 5.5 to 6.2 GHz, a fabricated module exhibits an excellent spatial modulation potential with a dynamic range of 9.6 to 19.9 dB. The spatial modulation experiment was carried out using base-band signals such as sine-waves and square-waves. A measured AM-modulation factor of 60% was achieved.
The influence of resource availability on preferences for human body weight and non-human objects

It has been proposed that there may be a general psychological mechanism which interacts with resource availability to influence preferences for human body weight, which may also extend to non-human objects. To test this hypothesis, we first replicated previous studies of preferences for human body weight using a new set of line drawings. The results of this study showed that hunger, as a proxy for resource availability, elicited a preference for a slightly heavier body weight. We then designed three studies that manipulated the size of different objects (an anvil, an empty milk bottle, and differently-filled bottles) and asked participants to rate these for aesthetic appeal. The results showed that the hunger level of participants in the three studies did not affect the aesthetic appeal of the objects being rated. Explanations for these findings are discussed in conclusion.
A Layer-Based Restoration Framework for Variable-Aperture Photography

We present variable-aperture photography, a new method for analyzing sets of images captured with different aperture settings, with all other camera parameters fixed. We show that by casting the problem in an image restoration framework, we can simultaneously account for defocus, high dynamic range exposure (HDR), and noise, all of which are confounded according to aperture. Our formulation is based on a layered decomposition of the scene that models occlusion effects in detail. Recovering such a scene representation allows us to adjust the camera parameters in post-capture, to achieve changes in focus setting or depth-of-field with all results available in HDR. Our method is designed to work with very few input images: we demonstrate results from real sequences obtained using the three- image "aperture bracketing" mode found on consumer digital SLR cameras.
Academic ‘place-making’: fostering attachment, belonging and identity for Indigenous students in Australian universities

ABSTRACT Place is a concept used to explore how people ascribe meaning to their physical and social surrounds, and their emotional affects. Exploring the university as a place can highlight social relations affecting Australian Indigenous students’ sense of belonging and identity. We asked what university factors contribute to the development of a positive sense of place for these students. Findings are presented from two Australian universities, based on focus groups with Indigenous students, and interviews with Indigenous and non-Indigenous staff. Students prioritized relationships with academics as a key theme, stressing academic’s flexibility and understanding enabled their persistence at university. Students situationally manage self-identification, requiring academics to engage effectively with diverse students, but staff felt they required further professional development. We argue that academics can ‘make’ university places in their pedagogies and mentoring roles, but require universities to recognize this pedagogical caring as a legitimate and valued element of their work.
Local average signal estimation in Nakagami-m channels

Information about the spatial local mean signal values is used as a control information in many practical aspects of digital communications. However, there are just few analytical papers that give recommendations for the signal samples postprocessing (in post-Rayleigh channels only), which should enable us to estimate these local mean values accurately. In this paper, the most general recommendations for the signal spatial averaging in post- and pre-Rayleigh channels are derived, assuming Nakagami-m distribution of multipath. Obtained results are consistent with generally known Lee's recommendation [1] for signal averaging in outdoor cells. Additionally, the proposed methodology and derived equations provide analytical confirmation of empirical results obtained experimentally in indoor [2] and enable us to derive recommendations for spatial signal averaging in channels with a large amount of multipath.
Periodontal Ligament, Cementum, and Alveolar Bone in the Oldest Herbivorous Tetrapods, and Their Evolutionary Significance

Tooth implantation provides important phylogenetic and functional information about the dentitions of amniotes. Traditionally, only mammals and crocodilians have been considered truly thecodont, because their tooth roots are coated in layers of cementum for anchorage of the periodontal ligament, which is in turn attached to the bone lining the alveolus, the alveolar bone. The histological properties and developmental origins of these three periodontal tissues have been studied extensively in mammals and crocodilians, but the identities of the periodontal tissues in other amniotes remain poorly studied. Early work on dental histology of basal amniotes concluded that most possess a simplified tooth attachment in which the tooth root is ankylosed to a pedestal composed of “bone of attachment”, which is in turn fused to the jaw. More recent studies have concluded that stereotypically thecodont tissues are also present in non-mammalian, non-crocodilian amniotes, but these studies were limited to crown groups or secondarily aquatic reptiles. As the sister group to Amniota, and the first tetrapods to exhibit dental occlusion, diadectids are the ideal candidates for studies of dental evolution among terrestrial vertebrates because they can be used to test hypotheses of development and homology in deep time. Our study of Permo-Carboniferous diadectid tetrapod teeth and dental tissues reveal the presence of two types of cementum, periodontal ligament, and alveolar bone, and therefore the earliest record of true thecodonty in a tetrapod. These discoveries in a stem amniote allow us to hypothesize that the ability to produce the tissues that characterize thecodonty in mammals and crocodilians is very ancient and plesiomorphic for Amniota. Consequently, all other forms of tooth implantation in crown amniotes are derived arrangements of one or more of these periodontal tissues and not simply ankylosis of teeth to the jaw by plesiomorphically retaining “bone of attachment”, as previously suggested.
The role of thrombophilia and thyroid autoimmunity in unexplained infertility, implantation failure and recurrent spontaneous abortion.

BACKGROUND The role of thrombophilia and thyroid autoimmunity in unexplained infertility (UI), implantation failure (IF) and recurrent spontaneous abortion (RSA) is controversial and poorly understood. METHODS From March, 2004 to January, 2007, 119 women were prospectively included: 32 oocyte donors, 31 patients with UI, 26 with IF and 30 with RSA. The IF and RSA groups presented normal preimplantation genetic screening. Protein C, protein S, antithrombin III, lupus anticoagulant, activated protein C resistance (APCR), immunoglobulin M and G anticardiolipin antibodies, homocystine, Factor V Leiden, prothrombin G20210A mutation, methylentetrahydrofolate reductase C677T mutation, thyroid-stimulating hormone (TSH), free thyroxine, anti-thyroid peroxidase (TPO) and anti-thyroglobulin (TG) antibodies were assessed. RESULTS The prevalence of thrombophilia was high and similar among groups. In the IF group, the prevalence of APCR (15.4%), lupus anticoagulant (11.5%) and combined thrombophilia (19.2%) was higher, but not significantly different, than the other three groups. The prevalence of thyroid autoimmunity in women with IF (anti-TPO antibodies, P = 0.009; anti-TPO plus anti-TG antibodies,P = 0.04) and UI (anti-TPO, P = 0.002; anti-TG, P = 0.019; anti-TPO plus anti-TG antibodies, P = 0.005) was significantly increased in comparison to those with RSA. There was also a trend towards a higher prevalence of thyroid autoimmunity in the UI and IF groups than in the control group. TSH and free thyroxine levels all remained within a normal range. CONCLUSIONS When embryo aneuploidy is ruled out, thrombophilia could constitute an etiologic factor in IF. Furthermore, thyroid autoimmunity is strongly related to UI and IF.
Renormalization of multidimensional Hamiltonian flows

We construct a renormalization operator acting on the space of analytic Hamiltonians defined on , d ⩾ 2, based on the multidimensional continued fractions algorithm developed by the authors. We show convergence of orbits of the operator around integrable Hamiltonians satisfying a non-degeneracy condition. This in turn yields a new proof of a KAM-type theorem on the stability of diophantine invariant tori.
On Achieving Seamless IP Communications in Heterogeneous Vehicular Networks

The supporting infrastructure and communications technologies for vehicular networking contexts are heterogeneous by nature. Large coverage access networks, such as 3G/4G, coexist with wireless local area networks and dedicated short-range communications. In such a scenario, we investigate the seamless provision of mobile Internet access and general IP services over the heterogeneous network, in particular for loosely coupling architectures. We propose a hybrid global mobility scheme that allows for the ongoing IP sessions to be transferred across dissimilar radio access networks that may belong to different administrative domains. In order to achieve the global mobility, our scheme combines host- and network-based mobility. The solution focuses on urban vehicular scenarios and enables seamless communications for in-vehicle networks, passengers with mobile devices, and users of public transportation commuting along the system. By means of analytical evaluations and simulations of realistic urban vehicular scenarios, we show that our hybrid scheme can achieve seamless IP communications for mobile Internet access over the heterogeneous vehicular network.
Clinical Research Interventional Cardiology Taxus Vi 2-year Follow-up: Randomized Comparison of Polymer-based Paclitaxel-eluting with Bare Metal Stents for Treatment of Long, Complex Lesions

Aims Drug-eluting stents (DESs) have shown to be effective in reducing in-stent restenosis, although data relating to long-term experience in treating more complex lesion subsets are limited. In order to assess the long-term safety and clinical efficacy of the polymer-based moderate release (MR) paclitaxel-eluting TAXUS TM MR stent in treatment of complex lesion subsets, we evaluated the 2-year follow-up of TAXUS VI. Method and results TAXUS VI was a randomized multi-centre study enrolling 446 patients with complex lesions, including small vessels in 28% of patients and a mean lesion length of 20.6 mm. At 9-month follow-up, the use of the TAXUS MR stent was highly effective, resulting in a significant 53% reduction of the target vessel revascularization (TVR) rate (primary endpoint) from 19.4% in the control group to 9.1% in the TAXUS group (P ¼ 0.0027). Clinical follow-up at 2 years post-stenting was available in 98.6% of the TAXUS group and 95.6% of the control group. The incidence of major adverse cardiac event at 1-and 2-year follow-up was 16.4% and 21.3% in the TAXUS group when compared with 22.5 and 25.1% in the control group, respectively. A significant difference in TVR was maintained at 2-year follow-up (TAXUS 13.9%; control 21.9%; P ¼ 0.0335). The cumulative 1-and 2-year survival rates free from TVR were, respectively, 91.7 and 90.3% in the TAXUS group vs. 80.0 and 79.0% in the control group (log-rank P , 0.001). The number of patients required to be treated with a TAXUS stent to prevent one re-percutaneous coronary intervention at 2 years was 12.5. Conclusion Treatment of complex coronary lesions with the polymer-based MR paclitaxel-eluting TAXUS MR stent is associated with a sustained clinical benefit and low rates of TVR up to 2 years after device implantation.
Granule neurons generated during development extend divergent axon collaterals to hippocampal area CA3

Most excitatory intrahippocampal pathways are characterized by significant, highly ordered projections into the long, or septotemporal, hippocampal axis. However, the mossy fiber system, the excitatory projection by which the dentate gyrus projects to hippocampal area CA3, is considered an exception, being organized to innervate exclusively transversely oriented cortical layers of the hippocampus. In the present study, the anatomy of the rat mossy fiber system was investigated using axonal tracing techniques, with an emphasis on determining its projection pattern into the long hippocampal axis. To this end, we used dual ipsilateral retrograde tracer injections to determine whether individual granule cells extend divergent axon collaterals to septotemporally distinct levels of hippocampal area CA3. We combined this technique with the fluorescent immunohistochemical detection of 5‐bromo‐2′‐deoxyuridine (BrdU), a marker of granule cell precursors and their progeny, to address whether the divergence of mossy fiber collaterals within area CA3 might by related to ontogenic gradients in granule cell genesis. We observed single granule neurons that had retrogradely transported both tracers, indicating that they had axon collaterals passing through or terminating within the distinct levels of area CA3 into which tracer had been injected. By using BrdU labeling, we identified divergent granule neurons that were produced during embryonic and postnatal development. We observed no adult‐generated granule neurons with significantly diverging mossy fiber collaterals. However, many fewer cells were labeled with BrdU in adult‐exposed animals. Because of this smaller sample, we cannot rule out the possibility that small numbers of divergent adult‐generated granule cells exist. We conclude that a proportion of the hippocampal mossy fiber projection extends septotemporally divergent axon collaterals to hippocampal area CA3. J. Comp. Neurol. 452:324–333, 2002. © 2002 Wiley‐Liss, Inc.