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Gain Based Delay Balancing in the Deep Submicron Era
Ryusuke EGAWA,Jubee TADA,Hiroaki KOBAYASHI,Gensuke GOTO 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper presents a novel technique to balance the delays in a combinational logic circuit for an equal delay circuit design. The delay balancing technique relies on a gain based delay model and the availability of a continuous size delay elements library. Based on the concept of logical effort in very large scale integrated circuits in the deep submicron era, our proposed technique attempts to minimize a delay difference of combinational logic circuits. Delay balancing tools based on our proposal are developed, and the effectiveness of tools is evaluated. Experimental results show that our proposal achieves 9.96% delay variations on average in combinational logic circuits.
Number of workers and efficiency in monotonous work
Ryusuke Arai,Ayaka Koizumi,Yoshinori Horie 대한인간공학회 2007 대한인간공학회 학술대회논문집 Vol.- No.-
Recently, workers have not remained in the same office over the long term. As the number of workers changing employment increases, changes in working patterns have resulted. Generally, individual productivity decreases as the number of employee groups increases. Such a phenomenon was termed ""social loafing"" or the ""bystander effect"" by Latane, and ""group polarization"" by Stonar [1]. Moreover, it is clear that in a group situation, the amount of work a person completes is lower than in an individual worker situation, as described in ""the tug-of-war experiment"" by Ringelman [1]. Previous studies have chiefly focused on the number of people in work groups. In the present study, the relationship between the degree of task complexity and the employee head count in determining worker efficiency. An assembly task was completed in four stages using marketed blocks (LEGO). Each subject was given 100 blocks with which to work. An increase in the personnel involved in completing a task, increases competition among workers, improving efficiency (reducing time needed to complete the task). The National Air and Space Administration Task Load Index (NASA-TLX) concept has demonstrated that a four-person team can complete tasks with higher adaptive weighted workload (AWWL) rating than either a two-person team or an individual worker. In the present experiment, the four-person team was the most efficient at completing the tasks at all four complexity stages.
Changes of Pupil Size during Colored Texture Observation
Ryusuke Arai,Midori Tanaka,Takahiko Horiuchi 한국색채학회 2017 AIC 2017 Jeju Vol.2017 No.10
The pupil size has been studied for cognitive processing of visual information. It is known that the pupil size is primarily controlled by the physical characteristics of the visual stimulus (illuminance of viewing environment) and psychological variables (e.g. interest, memory, and emotional awakening) during observation. However, the relationship between physical and psychophysiological characteristics during observation of appearance on the object surface has not been fully investigated. In this study, we investigate how the pupil size changes when human pay attention to the material appearance such as glossiness, roughness and colorfulness. In our psychophysiological experiment, we used seven colored fabrics with the same surface texture of canvas as experimental stimuli. The participants were asked to observe the experimental stimuli according to two different observation points. During the first half, participants looked out the entire experimental stimulus idly for investigating the effect by physical characteristics of viewing environment. During the second half, they carefully observed the surface appearance of physically the same stimulus for investigating psychophysiological characteristics. As a result, the pupil size reduced during the second half. In addition, it was found that the contraction rate of the pupil size depending on the saturation of the object surface.
Jinno, Ryusuke,Kaneta, Kunio American Physical Society 2017 Physical Review D Vol.96 No.4
<P>We propose a new class of inflationary models in which inflation takes place while the inflaton is climbing up a potential hill due to a coupling to gravity. We study their attractor behavior, and investigate its relation with known attractors. We also discuss a possible realization of this type of models with natural inflation, and show that the inflationary predictions come well within the region consistent with the observation of the cosmic microwave background.</P>
Jinno, Ryusuke,Kaneta, Kunio,Oda, Kin-ya American Physical Society 2018 Physical review. D Vol.97 No.2
<P>We propose a realization of cosmic inflation with the Higgs field when the Higgs potential has degenerate vacua by employing the recently proposed idea of hill-climbing inflation. The resultant inflationary predictions exhibit a sizable deviation from those of the ordinary Higgs inflation.</P>
Hillclimbing inflation in metric and Palatini formulations
Jinno, Ryusuke,Kaneta, Kunio,Oda, Kin-ya,Park, Seong Chan North-Holland Pub. Co 2019 Physics letters. Section B Vol.791 No.-
<P><B>Abstract</B></P> <P>A new setup of cosmic inflation with a periodic inflaton potential and conformal factor is discussed in the metric and Palatini formulations of gravity. As a concrete example, we focus on a natural-inflation-like inflaton potential, and show that the inflationary predictions fall into the allowed region of cosmic microwave background observations in both formulations.</P>