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Search Results: 1 - 10 of 530 matches for " Kunihiko Higa "
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A Study on Communication Media Selection: Comparing the Effectiveness of the Media Richness, Social Influence, and Media Fitness  [PDF]
Rui Gu, Kunihiko Higa, Douglas R. Moodie
Journal of Service Science and Management (JSSM) , 2011, DOI: 10.4236/jssm.2011.43035
Abstract: Media selection has become a more complex problem because of the fast development of Information and Communication Technology. However, there is little quantified work on the tools for media selection decisions. The three main tools available are Media Richness Theory (MRT) [1], Social Influence Perspectives (SIP) [2], and Media Fitness Framework (MFF) [3,4]. MFF is a combination of the factors from MRT and SIP with additional factors for environmental and resource limitations. In this research, we tested the effectiveness of media selection prediction of these three tools on 72 communication tasks from 18 companies. We then compared the results to real data. This comparison showed MFF to be more effective than either MRT or SIP, particularly in multiple-media situations. MFF also had a faster convergence of media selection prediction.
An Empirical Analysis of Communication on Trust Building in Virtual Teams  [PDF]
Makoto Shinnishi, Kunihiko Higa
Journal of Service Science and Management (JSSM) , 2018, DOI: 10.4236/jssm.2018.112020
Abstract: This research aims to analyze the communication on trust building in virtual teams. Ten teams consisting of three workers (an editor, a designer, and a coder) were asked to create a sample web page in one week. All workers were in remote environment and a text-only communication tool was provided to all teams. In addition, five teams could use a non-text communication tool through which one can see other member’s situation with a web camera image and a short text message. All communication logs were collected and classified into three types: formal communication, informal communication, and awareness communication. All participated workers answered the questionnaire about trust before and after the task was completed. The analysis results based on the questionnaire and communication log data are discussed at the end. The result shows the use of non-text communication tool did not affect trust building; however, amount of awareness communication affected trust building. Log-in to the communication system at the same time also affected trust building. The findings of this study showed the tendency of awareness communication helping team building trust in the remote environment.
Design of a Switched Capacitor Negative Feedback Circuit for a Very Low Level DC Current Amplifier  [PDF]
Hiroki Higa, Naoki Nakamura
Circuits and Systems (CS) , 2013, DOI: 10.4236/cs.2013.44048

To miniaturize a very low level dc current amplifier and to improve its output response speed, the switched capacitor negative feedback circuit (SCNF), instead of the conventionally used high-ohmage resistor, is presented in this paper. In our system, a switched capacitor filter (SCF) and an offset controller are also used to decrease vibrations and offset voltage at the output of the amplifier using SCNF. The theoretical output voltage of the very low level dc current amplifier using SCNF is obtained. The experimental results show that the unnecessary components of the amplifier’s output are much decreased, and that the response speed of the amplifier with both the SCNF and SCF is faster than that using high-ohmage resistor.

SAGASTI, Francisco (1997). Pobreza, exclusión y estrategias de desarrollo: una aproximación preliminar. Lima: Foro Nacional / Internacional – Agenda: Perú. 32 pp.
Minoru Higa
Revista Economía , 2009,
Abstract: La rese a no presenta resumen.
Electromagnetic interactions in Halo Effective Field Theory
Higa R.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100306001
Abstract: After a brief discussion of e ective eld theory applied to nuclear clusters, I concentrate on the inclusion of two particular aspects, namely, narrow resonances and electromagnetic interactions. As examples of applications, I present the details of our studies on alpha-alpha and proton-alpha scattering.
A compreensao da ciencia e da tecnología pelo movimento sindical brasileiro
William Higa
Convergencia , 2001,
Abstract: This work is one of the results of dissertation presented for acquire Master s degree at Scientific and Technological Policy Department - UNICAMP, about the comprehension of the Science & Technology (S&T) for the Brazilian Trade Unionism (BTU), from 1990 to 1999 (Higa, 2000). The text is separated in 2 parts: the discussion about social construction of S&T starting from a class vision; the construction of a frame work. There is an example of application related to frame work in the BTU in Enclo sure.
NN potentials from IR chiral EFT
Renato Higa
Physics , 2009,
Abstract: Chiral perturbation theory is nowadays a well-established approach to incorporate the chiral constraints from QCD. Nevertheless, for systems involving one baryon, the power counting which dictates the chiral order of observables is not as simple and consensual as in the purely mesonic case. The heavy baryon approach, which relies on a non-relativistic expansion around the limit of infinitely heavy baryon, recovers the usual power counting but destroys some analytic properties of the scattering amplitude. Some years ago, Becher and Leutwyler proposed a Lorentz-invariant formulation of chiral perturbation theory that maintains the required analytic properties, but at the expense of a less intuitive power counting. Aware of the shortcomings of the heavy baryon formalism, the S\~ao Paulo group derived the two-pion exchange component of the nucleon-nucleon potential in line with the works of Becher and Leutwyler. A striking result was that the long distance properties of the potential is determined by the specific low energy region of the pion-nucleon scattering amplitude where the heavy baryon expansion fails. In this talk I will discuss the origin of such failure and how it reflects in the asymptotics of the nucleon-nucleon interaction. Some results for phase shifts and deuteron properties will be shown, followed by a comparison with the heavy baryon predictions.
Nuclear clusters with Halo Effective Field Theory
Renato Higa
Physics , 2008, DOI: 10.1142/S0217732309000292
Abstract: After a brief discussion of effective field theory applied to nuclear clusters, I present the aspect of Coulomb interactions, with applications to low-energy alpha-alpha and nucleon-alpha scattering.
Coulomb interactions within Halo Effective Field Theory
Renato Higa
Physics , 2007, DOI: 10.1007/s00601-008-0272-0
Abstract: I present preliminary results of effective field theory applied to nuclear cluster systems, where Coulomb interactions play a significant role.
Low-energy constants and relativity in peripheral nucleon-nucleon scattering
Renato Higa
Physics , 2004,
Abstract: In our recent works we derived a chiral $O(q^4)$ two-pion exchange nucleon-nucleon potential (TPEP) formulated in a relativistic baryon (RB) framework, expressed in terms of the so called low energy constants (LECs) and functions representing covariant loop integrations. We showed that the expansion of these functions in powers of the inverse of the nucleon mass reproduces most of the terms of the TPEP derived from the heavy baryon (HB) formalism, but such an expansion is ill defined and does not converge at large distances. In the present work we perform a study of the phase shifts in nucleon-nucleon ($NN$) scattering for peripheric waves ($L\geq 3$), which are sensitive to the tail of the potential. We assess quantitatively the differences between the RB and HB results, as well as variations due to different values of the LECs. By demanding consistency between the LECs used in $\pi N$ and $NN$ scattering we show how $NN$ peripheral phase shifts could constrain these values. We demonstrate that this idea, first proposed by the Nijmegen group, favors a smaller value for the LEC $c_3$ than the existing ones, when considering the TPEP up to order $q^4$ in the chiral expansion.
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