JEPICO Corporation

Tokyo, Japan

JEPICO Corporation

Tokyo, Japan

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Katayama N.,NICT | Katayama N.,Tokyo Institute of Technology | Yoshimura N.,NICT | Yoshimura N.,Tokyo Institute of Technology | And 5 more authors.
33rd AIAA International Communications Satellite Systems Conference and Exhibition, ICSSC 2015 | Year: 2015

This paper introduces a development work of small-sized, Ka-band mobile communica- tions platform for Autonomous Surface Vehicle (ASV) operations in the sea, and shows key design elements to achieve an order of megabit-per-second data speed (1 to 5Mbps) between the platform and a Ka-band geostationary satellite. The mobile communications platform will be mounted on both ASV and research vessels (RV) as seen in Figure 1, and the platform mainly consists of auto-tracking antenna subsystem and transmit/receive subsystem. A simulated result of auto-tracking antenna pointing performance of the Ka- band mobile platform is presented and discussed under the estimated ocean motion around Japan Exclusive Economic Zone (EEZ). © 2015, American Institute of Aeronautics and Astronautics Inc, AIAA. All Rights Reserved.


Kurihara Y.,Seikei University | Masuyama K.,Hosei University | Nakamura T.,JEPICO Corporation | Bamba T.,NITTETSU ELEX Co. | Watanabe K.,Hosei University
IEEJ Transactions on Electronics, Information and Systems | Year: 2010

Recently, there are various accidents and crimes related to the car. In some cases, the accidents and the crimes can be prevented if it is possible to detect a human who is in the car. For example, we can prevent a baby who is left in a car under the hot weather from dehydration or death occurred by heat inside disease. In another case, it is estimated that the United States currently has as many as 12 million illegal immigrants. In order to prevent further influx of illegal immigrants, the police are physically searching incoming vehicles at national boundaries aiming at finding those who are hiding inside. However, the physical inspections require much manpower cost and time. An inspection method to see inside the vehicles through X-ray images has also been used for this end. But the cost and the installation places are the problems of the large-scale X-ray system. Proposed in this paper is a piezoelectric ceramic system to handily measure the micro vibrations of motor vehicles. And applying the algorithm of Support Vector Machine (SVM), the existence of human body inside vehicles can be detected. The experiment was carried out using four types of vehicles: a mini car; an auto mobile; a van; and a truck weighing 1.5 tons. As the results, the correct determination ratio was 91.2% for the experiment with the piezoelectric ceramic under the front wheels and 97.0% under the rear wheels, when the vehicle used for the examination had also been used together with other three types of vehicles to obtain SVM training data. When the vehicle used for the examination had not been used together with the other three to obtain SVM training data, on the other hand, the correct determination ratio was 93.7% for the experiment with the piezoelectric ceramic under the front wheels and 95.7% under the rear wheels. © 2010 The Institute of Electrical Engineers of Japan.


Kurihara Y.,Seikei University | Watanabe K.,Hosei University | Nakamura T.,JEPICO Corporation | Tanaka H.,Tokyo Medical and Dental University
IEEE Transactions on Biomedical Engineering | Year: 2011

This paper describes an unconstrained pneumatic method of estimating the δ-wave activity of the brain from the heartbeat signal. Based on experiments showing that transinformation of the heartbeat signal corrupted by body movement was correlated with the δ-wave activity, we developed a method of estimating the percentage of the δ-wave included in the EEG from the transinformation. The comb filtering technique was used to obtain accurate transinformation. We applied the proposed method to young normal subjects to evaluate the method. As a result, the correlation between the δ -wave included in the EEG and the transinformation was 0.727 and the average error of the estimates of δ-wave percentage was 14.9%. The δ-wave activity and heartbeat activity were shown to be quantitatively related. This suggests that sleep depth can be estimated from the δ -wave percentage estimated by unconstrained measurement of the heartbeat signal of young normal subjects. © 2006 IEEE.


Nakamura T.,JEPICO Corporation | Kurihara Y.,Seikei University | Watanabe K.,Hosei University | Terada M.,JEPICO Corporation
IEEE Sensors Journal | Year: 2012

This paper describes a novel DC-coupled single input preamplifier which is robust to drift noise and variation due to the circuit operation conditions. The preamplifier is intended for capacitive sensors such as the capacitive electret film type sensor, which is one of the most sensitive and accurate sensors presently available. There are both DC-coupled and AC-coupled conventional preamplifiers available for such sensors. However, DC-coupled preamplifiers do not always suppress drift noise and variation, while AC-coupled preamplifiers require a large capacitor to expand the frequency range, thus making the large-scale integration (LSI) very large and inducing problems associated with the large capacitor. We describe a DC-coupled preamplifier with wider low-frequency range as well as less drift noise and variation. The design combines a time constant amplifier and rail-to-rail transconductance amplifier, and is implemented in an LSI with 6-GHz f T bipolar 11-V process with 5-V supply voltage. For an LSI with this preamplifier, the output voltage variation due to changes in load current is within ±35 mV, whereas the variation for a conventional preamplifier is proportional to the load current up to 2.5 V. The output voltage drift due to changes in temperature and load current is restricted to within ±35 mV for load resistance of 1-5 kOmega; , whereas the drift for a conventional preamplifier is 800 mV. © 2011 IEEE.


Watanabe K.,Hosei University | Kurihara Y.,Seikei University | Nakamura T.,JEPICO Corporation | Tanaka H.,Tokyo Medical and Dental University
IEEE Sensors Journal | Year: 2010

This paper describes a novel strategy for providing ubiquitous medical and healthcare monitoring through the use of a mobile phone equipped with a low-frequency microphone sensitive to pressure waves in the frequency range of 0.1 Hz to 10 kHz. The mobile phone is placed in a sealed air cushion under the pillow or mattress of the subject's bed. The low-frequency microphone in the mobile phone picks up the signals from the subject's heartbeat, respiration, body movement and snoring and transmits them to a healthcare center where an auto-diagnosing system or specialist monitors the subject's health condition. © 2010 IEEE.


Frazier C.,JEPICO Corporation
33rd AIAA International Communications Satellite Systems Conference and Exhibition, ICSSC 2015 | Year: 2015

Although a simple algorithm and accompanied by many similar artificial potential field concepts, it is possible to use the Re-Active Vector Equilibrium algorithm to develop self arranging satellite swarms. The RAVE algorithm makes use of multiple Points Subject to a Potential to define the satellite centroid and direction. In this paper a simulation of both a 2D structured arrangement and a 3D unstructured arrangement are presented and discussed. © 2015, American Institute of Aeronautics and Astronautics Inc, AIAA. All Rights Reserved.


Kitazume S.,JEPICO Corporation | Takahara Y.,JEPICO Corporation | Hayashi C.,JEPICO Corporation | Gilmore R.,EMSolution
33rd AIAA International Communications Satellite Systems Conference and Exhibition, ICSSC 2015 | Year: 2015

In support of future ocean broadband projects, a Ka-band mobile satellite communications platform is proposed. To establish a high speed communications link, a high reliability and high power RF amplifier is a key component of the subsystem. The Ka-band High Reliability Multi-Mission Amplifier now under development is presented with the technical design and results of ongoing hardware testing. The purpose of this study is to demonstrate that the high reliability of a combined solid state multi-mission power amplifier consisting of many MMIC amplifiers. © 2015, American Institute of Aeronautics and Astronautics Inc, AIAA. All Rights Reserved.

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