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RSSI comparison between 2.4GHz band and Sub-Giga band for WPAN
Get PDFapplication/pdfRSSI value of line of sight is compared for WPAN 2.4GHz and Sub-Giga band. The measurement result indicates RSSI of Sub-Giga band is more stable than that of 2.4GHz band. Also, close-in reference distance of Sub-Giga band is shorter than 2.4GHz band. In case of indoor experiment, RSSI value is enhanced owing to fading effect that is confirmed by environment factor change of less than 1.0.conference pape
Design Method of a Triple Spherical Reflector Antenna
Get PDFapplication/pdfDesign method of a triple spherical reflector antenna having three concentric spherical reflectors and two additional reflectors is presented. Since the outside spherical reflector is used for a main reflector of the first stage, the central spherical reflector is commonly used for both a subreflector of the first stage and a main reflector of the second stage, and the inside spherical reflector is used for a subreflector of the second stage, a triple spherical reflector antenna consists of two double spherical reflector antennas. Two additional reflectors have the function of focusing at the same point for the incident waves into two main reflectors of two double spherical reflector antennas.departmental bulletin pape
Design Method of a Reflector Shaping-Type Spherical Reflector Antenna fed by a Lens-Loaded Horn
Get PDFapplication/pdfDesign method of a reflector shaping-type spherical reflector antenna having the sub-reflector and the additional reflector is reported. In the antenna, since the feed horn is placed between the subreflector and the additional reflector, ray blocking due to the feed horn arise.
In this report, design method of a reflector shaping-type spherical reflector antenna without ray blocking due to the feed horn is presented by replacing the feed horn and additional reflector to the reverse-side feed horn and the additinal lens, namely the lens-loaded horn.departmental bulletin pape
Classification of learners based on typical mistake patterns in programming edudation
Get PDFapplication/pdfA web based programming learning support system is now planned to be developed aiming for the holistic improvement of programming technique.This software is intended to be helpful for students with insufficient understanding, and improve their programming technique after class hour learning.This paper proposes a guideline to classify the students by their typical mistakes in programming in order to address a suggestion for the development of the software.conference pape
Investigation on the Impact of Time Interval Criteria in a Quantification Analysis Method of Twitter Users
Get PDFapplication/pdfThe authors have addressed to construct a quantification analysis method of Twitter users by using entropy calculated from each user's posting activities. In the previous efforts, with the vectorized user data obtained from entropy transformation, the effectiveness of clustering and decision tree methods for classifying bots and humans have been examined. The bot filtering with satisfactory accuracy was confirmed by the usual method, but the investigation about the impact of time interval criteria in the usual method is the necessary work to further improve the filtering precision. Especially as the first step, it is essential to clarify how the time interval criteria affects the value of entropy. Therefore this paper aims to report the result of investigation on the impact of time interval criteria in a quantification analysis method of Twitter users.conference pape
Dependence on Examinees for Spectral Images
Get PDFapplication/pdfThe authors have been developing a visualization technique for hemoglobin concentration images. The clearness of the hemoglobin concentration images depends on examinees. Differences on clearness with respect to examinees have been studied.departmental bulletin pape
Evaluation of earthquake-resistant improvement capacity of wooden framed walls using short diagonal members
Get PDFapplication/pdfThis study aims for earthquake-resistant improvement to reuse timber members pulled down from old existing houses. Totally seven type of specimens were used to horizontally static loading test. The load carrying capacity, deformability, hysteretic energy absorption capacity, and failure mode of the specimens were investigated to compare each other. It is confirmed that the specimens installed three sets of crossed short-diagonal members subjected to both tension and compression with steel joint plates and bolts, those were about 2.0 of wall unit multiplier, had some range of deviation on the load-carrying capacity and other earthquake-resistant properties. On the other hand, the test specimens with diagonal members subjected to only compression and no tension, had relatively high load-carrying capacity that show about 4.0 of wall unit multiplier and also large hysteretic energy absorption quantities.departmental bulletin pape
Research of the life traffic which considered aging of the Itsukaichi area
Get PDFapplication/pdfIt thought that it was necessary to introduce transportation service in Hiroshima also for activation of the area, and examined performing a transportation service plan first of all bearing bus service in mind.
Aging of the residential section five years and ten years after the trend of the percentage change in population for the past five years was predicted this time.
It is necessary to grasp according to the area using GIS about the problem considered to happen the present problem and from now on and, and works on the measure in transportation service by clarifying shopping level service of the every place region in the ward.
As a result, in the new residential section made after the high-growth era, it turned out that the increasing rate is large and aging will progress considerably from now on.
The bus route proposal that aging will, from now on, connect between the residential sections and established city areas which are expected to urgency was examined, and the bus service in consideration of an aging society was proposed.departmental bulletin pape