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We have improved the performances of InP-based HEMTs and MMICs for terahertz-wave wireless communications using a high frequency carrier wave around 300 GHz in an R&D program launched by the Ministry of Internal Affairs and Communications, Japan (MIC). Furthermore, we also have developed GaN and InSb-based HEMTs in another research. In this paper, we demonstrated the performances of InP, GaN and...
This paper introduces a wireless access system for the wide area ubiquitous network (WAUN), which is a large cell-based public sensor network, and provides feasibility study results gained through field tests. The wireless access system uses several key technologies to accommodate widely dispersed small simple terminals. First, to realize the large cell radius of several kilometers, space and site...
A new wireless network for the wide area ubiquitous network (WAUN), which is used for transmitting and receiving information for sensors and actuators, is studied. The wireless network for the WAUN needs to have wide cell coverage with a low transmission rate to support new applications economically using low-end wireless terminals. The transmission power of the wireless terminal of the WAUN must...
This paper presents a burst modulation/demodulation method for narrowband wireless communication systems, whose traffic is especially dominated by short packet bursts. In order to improve transmission efficiency and burst synchronization performance, the proposed method provides a preamble-less frame structure with minimum number of training symbols. This paper also presents the experimentally measured...
The multi-target constant modulus algorithm (MT-CMA) can blindly separate multiple co-channel signals captured by an antenna array. It sequentially calculates the unknown weight vectors by executing CMA on a subspace spanned by these vectors, and estimates the weight vectors of all users. Thus, it needs to precisely estimate the subspace by using the calculated weight vectors. The conventional estimation...
An NaCl-independent stability-enhanced mutant of glucose dehydrogenase (GlcDH) was obtained by using in vitro directed evolution. The family shuffling method was applied for in vitro directed evolution to construct a mutant library of GlcDH genes. Three GlcDH-coding genes from Bacillus licheniformis IFO 12200, Bacillus megaterium IFO 15308 and Bacillus subtilis IFO 13719 were each cloned by direct...
Purpose: Membrane fusion by influenza HA protein have initial time lag when monitored by fluorescence dequenching method, the cause of which is thought to be the multi-step process of fusion. In order to dessect the steps, we examined fusion of individual HA-reconstitutted vesicles (RV) in comparison with the virus particles.Methods: The RV was labelled with R18, and the flash of fluorescence due...
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