Hewlett-Packard (Japan)

Open source software (OSS) has become indispensable to our society. The success of OSS depends on the participation of a large number of developers or maintainers (contributors). Shedding light on the mechanisms of their participation has been an important academic and practical matter. One aspect to decide participation is the future prospects of a project. However, the causal mechanism behind participation has yet to be studied exhaustively and remains unclear. In this study, we used cryptocurrency projects, many of them were developed on GitHub, to better understand this mechanism. Both GitHub and cryptocurrencies are highly transparent, i.e., information is fully disclosed; we can analyze relevant information on a project, such as the contributors' activities, financial information, and development status. We adopted market capitalization as the substitution index of future prospects and the number of contributors and analyzed the relationship using time series analysis techniques, such as the Granger causality test and regression. We found that the number of contributors increases two months after market capitalization increases. This quantifies the impact of the future prospects of the project, i.e., of the market capitalization of a cryptocurrency, on the participation of contributors.

SummaryKofamKOALA is a web server to assign KEGG Orthologs (KOs) to protein sequences by homology search against a database of profile hidden Markov models (KOfam) with pre-computed adaptive score thresholds. KofamKOALA is faster than existing KO assignment tools with its accuracy being comparable to the best performing tools. Function annotation by KofamKOALA helps linking genes to KEGG resources such as the KEGG pathway maps and facilitates molecular network reconstruction.Availability and implementationKofamKOALA, KofamScan and KOfam are freely available from GenomeNet (https://www.genome.jp/tools/kofamkoala/).Supplementary informationSupplementary data are available at Bioinformatics online.

ABSTRACT This paper proposed and evaluated an estimation method for indoor positioning. The method combines location fingerprinting and dead reckoning differently from the conventional combinations. It uses compound location fingerprints, which are composed of radio fingerprints at multiple points of time, that is, at multiple positions, and displacements between them estimated by dead reckoning. To avoid errors accumulated from dead reckoning, the method uses short-range dead reckoning. The method was evaluated using 16 Bluetooth beacons installed in a student room with the dimensions of 11 × 5 m with furniture inside. The Received Signal Strength Indicator (RSSI) values of the beacons were collected at 30 measuring points, which were points at the intersections on a 1 × 1 m grid with no obstacles. A compound location fingerprint is composed of RSSI vectors at two points and a displacement vector between them. Random Forests (RF) was used to build regression models to estimate positions from location fingerprints. The root mean square error of position estimation was 0.87 m using 16 Bluetooth beacons. This error is lower than that received with a single-point baseline model, where a feature vector is composed of only RSSI values at one location. The results suggest that the proposed method is effective for indoor positioning.

MAPLE is an automated system for inferring the potential comprehensive functions harbored by genomes and metagenomes. To reduce runtime in MAPLE analyzing the massive amino acid datasets of over 1 million sequences, we improved it by adapting the KEGG automatic annotation server to use GHOSTX and verified no substantial difference in the MAPLE results between the original and new implementations.

A 'telco' or telecommunications service provider?s network is both the source of its high cost base and source of differentiation. Telcos incur the high capital and operational costs of customised, vendor-proprietary hardware as they seek differentiation through network capacity addition, service quality and coverage improvement. These decisions to invest in the network are motivated by supply-side competition and demand ? particularly cross-segment demand for data services, much of which is for ?over-the-top? social networking and video streaming services that the telco can only partially monetise. This has created a dichotomy of margin erosion ? a high cost to serve with diminishing returns on additional capacity investments. However, an approach that blends IT, networking and data centre technologies promises to improve this equation, as evidenced by primary research, surveys and proof-of-concepts by Hewlett Packard. Network Functions Virtualisation (NFV) offers to immediately lower the capital and operational cost base by implementing a growing set of previously closed network platforms and functions on standard IT hardware. This will set the scene in the next few years for faster ?software-defined network? (SDN) additions which will improve utilisation of network assets and allow lower-cost experiments to flex and scale capacity to improve network services and introduce new innovations. This article provides an introductory view of these emergent developments.

The usage of live mobile TV and mobile video devices is increasing in Japan as well as in other countries. We conducted a user study in the summer of 2007, in the Tokyo area of Japan, with 11 participants, in order to understand through qualitative interviews when, how, and why people were using such devices. In this chapter, we present several findings from this user study, which reveals the different attitudes concerning the usage of live mobile TV compared with that of mobile video. These findings consider the following points. (1) Usage on commuter buses or trains, (2) usage at home, (3) usage related to experience sharing, and (4) interest of live mobile TV users in mobile video, and interest of mobile video users in live mobile TV. This chapter also proposes some ideas to improve user experience with mobile TV and video, and compares the results of our user study with those conducted in Finland, Korea, the USA, and the UK.

The usage of live mobile TV and mobile video devices is increasing in Japan as well as in other countries. In the summer of 2007, in the Tokyo area, we conducted a user study by means of qualitative interviews with 11 participants in order to understand when, how, and why people use such devices. In contrast to previous work, our user study compared the usage of live mobile TV with that of mobile video. In this article, our findings reveal a sharp contrast in (1) the usage of live mobile TV and mobile video on commuter buses or trains, at home, and for sharing experiences; and (2) the interest that live mobile TV users have in mobile video, and vice versa. In this article we present (1) findings that reveal the different attitudes concerning usage of live mobile TV compared with that of mobile video; and (2) hypotheses on user motivations, intentions, and desires derived from the observed attitudes.

We describe two protocols for efficient data transmission using a single passive bus. Different types of interactions are obtained enabling the deterministic transfer and teleportation of composite quantum systems for arbitrary subsystem dimension and for arbitrary numbers of subsystems. The subsystems may become entangled in the transmission in which case the protocols can serve generalized teleportation based information processing as well as storage and transmission functions. We explore the cases of two qubits and two qutrits in detail, obtaining a maximally entangling mapping of the composite systems and discuss the use of a continuous variable bus.

By providing coding ability at intermediate nodes, network coding has been shown to improve throughput in wireless broadcast/multicast networks. Considering a scenario where wireless ad-hoc peers cooperatively relay packets to each other to recover packets lost during MBMS broadcast, we show that by first imposing coding structures globally and then selecting the appropriate types within the structures locally, network coding can be optimized for video streaming in a rate-distortion manner. Experimental results show that our proposed scheme can improve video quality noticeably, by up to 19.71 dB over un-repaired video stream and by up to 8.34 dB over video stream using traditional unstructured network coding.

We discuss experimental effects in the implementation of a recent scheme for performing bus mediated entangling operations between qubits. Here a bus mode, a strong coherent state, successively undergoes weak Kerr-type non-linear interactions with qubits. A quadrature measurement on the bus then projects the qubits into an entangled state. This approach has the benefit that entangling gates are non-destructive, may be performed non-locally, and there is no need for efficient single photon detection. In this paper we examine practical issues affecting its experimental implementation. In particular, we analyze the effects of post-selection errors, qubit loss, bus loss, mismatched coupling rates and mode-mismatch. We derive error models for these effects and relate them to realistic fault-tolerant thresholds, providing insight into realistic experimental requirements.