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Katayama, Kazunori,Fuchu, Hidetaka,Sugiyama, Masaaki,Kawahara, Satoshi,Yamauchi, Kiyoshi,Kawamura, Yukio,Muguruma, Michio Asian Australasian Association of Animal Productio 2003 Animal Bioscience Vol.16 No.9
In order to clarify one of the biological functions of pork, we investigated whether a peptic hydrolysate of denatured porcine crude myosin showed inhibitory activity against angiotensin I-converting enzyme (ACE), which contributed to hypertension. Our results indicated that this hydrolysate showed relatively strong activity, and we therefore attempted to separate the involved peptides, which were considered to be active substances. To isolate these active peptides, the hydrolysate was separated using a solidphase separation, gel filtration high-performance liquid chromatography (HPLC), and two kinds of reverse phase HPLC. In each stage of separation, many fractions were detected, almost all of which showed ACE inhibitory activity. Thus, we suggested that the activity of the hydrolysate as a whole was a result of the activities of the many individual peptides. Six peaks were distinguished, with yields from 34 to 596 ppm of original crude myosin. In addition to the six peaks, many other active fractions were found throughout the separation steps, strongly suggesting that whole porcine crude myosin itself had ACE inhibitory activity. Moreover, pork as food was considered to function as an ACE inhibitory material in vivo, because pork proteins consist primarily of crude myosin, which included almost all the myofibrillar structural proteins.
Kouichi Katayama,Kensuke Miyajima,Masaaki Ashida,Tadashi Itoh 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
By the selective excitation of localized excitons in Cd0:8Mn0:2Te at 2 K, a new nonlinear PL band (hereinafter referred to as the X band) appears on the higher energy side of the ordinary magnetic polaron band. When the X band is observed through a linear analyzer with weak magnetic fields (0 - 0.3 T), under a Faraday configuration, it exhibits an oscillatory structure. The energy interval of this oscillation is half that of the Faraday rotation spectrum observed in the transmission spectrum. Therefore, the oscillation is interpreted as being caused by the Faraday rotation of the X-band luminescence, which is first emitted near the surface of excitation, passes through the sample, is re ected back from the rear surface and then passes through the sample again. By the selective excitation of localized excitons in Cd0:8Mn0:2Te at 2 K, a new nonlinear PL band (hereinafter referred to as the X band) appears on the higher energy side of the ordinary magnetic polaron band. When the X band is observed through a linear analyzer with weak magnetic fields (0 - 0.3 T), under a Faraday configuration, it exhibits an oscillatory structure. The energy interval of this oscillation is half that of the Faraday rotation spectrum observed in the transmission spectrum. Therefore, the oscillation is interpreted as being caused by the Faraday rotation of the X-band luminescence, which is first emitted near the surface of excitation, passes through the sample, is re ected back from the rear surface and then passes through the sample again.
Counter-Rotating Type Pumping Unit (Impeller Speeds in Smart Control)
Kanemoto, Toshiaki,Komaki, Keiichi,Katayama, Masaaki,Fujimura, Makoto Korean Society for Fluid machinery 2011 International journal of fluid machinery and syste Vol.4 No.3
Turbo-pumps have weak points, such as the pumping operation is unstable on the positive slope of the head curve and/or the cavitation occurs at the low suction head. To improve simultaneously both weak points, the first author invented the unique pumping unit composed of the tandem impellers and the peculiar motor with the double rotational armatures. The front and the rear impellers are driven by the inner and the outer armatures of the motor, respectively. Both impeller speeds are automatically and smartly adjusted in response to the pumping discharge, while the rotational torques between both impellers/armatures are counter-balanced. Such speeds contribute to suppress successfully not only the unstable operation at the low discharge but also the cavitation at the high discharge, as verified with the axial flow type pumping unit in the previous paper. Continuously, this paper investigates experimentally the effects of the tandem impeller profiles on the pump performances and the rotational speeds against the discharge, using the impellers whose loads are low and/or high at the normal discharge. The worthy remarks are that (a) the unstable operation is suppressed as expected and the shut off power is scarcely large in the smart control, (b) the blade profile contributes to determine the discharge giving the maximum/minimum rotational speed where the reverse flow may incipiently appears at the front impeller inlet, (c) the tandem impeller profiles scarcely affect the rotational speeds, while the loads of the front and the rear impellers are same, but (d) the impeller with the low load must run faster and the impeller with the high load must run slower at the same discharge to take the same rotational torque, and (e) the reverse flow at the inlet and the swirling velocity component at the outlet of the front impeller with the high load require making the rotational speed of the rear impeller with low load fairly faster at the lower discharge.
New Error Correcting Scheme for Hard Detected QAM Signal
Yamaoka, Tomaya,Yamazato, Takaya,Okada, Hiraku,Katayama, Masaaki,Ogawa, Akira 통신위성우주산업연구회 2004 Joint Conference on Satellite Communications Vol.2004 No.-
In order to achieve high speed satellite communication, we propose a new R=m-2/m error correcting scheme for hard detected $2^m$-QAM signal, where we consider m $\geq$ 6. The main focus of the paper is to improve the performance even in the case of hard-detection. As results, we found that our proposed error=correcting scheme achieves good error performance despite the hard detection and the high coding rate.
A Study on Cluster Lifetime in Multi-HopWireless Sensor Networks with Cooperative MISO Scheme
Huang, Zheng,Okada, Hiraku,Kobayashi, Kentaro,Katayama, Masaaki The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.4
As for cluster-based wireless sensor networks (WSNs), cluster lifetime is one of the most important subjects in recent researches. Besides reducing the energy consumptions of the clusters, it is necessary to make the clusters achieve equal lifetimes so that the whole network can survive longer. In this paper, we focus on the cluster lifetimes in multi-hop WSNs with cooperative multi-input single-output scheme. With a simplified model of multi-hop WSNs, we change the transmission schemes, the sizes and transmission distances of clusters to investigate their effects on the cluster lifetimes. Furthermore, linear and uniform data aggregations are considered in our model. As a result, we analyze the cluster lifetimes in different situations and discuss the requirements on the sizes and transmission distances of clusters for equal lifetimes.
Nishihara, Kazuharu,Okada, Hiraku,Yamazato, Takaya,Katayama, Masaaki 통신위성우주산업연구회 2003 Joint Conference on Satellite Communications Vol.2003 No.-
To increase the channel efficiency, most of the Low Earth-Orbital satellite (LEOs) systems use the multibeam antenna and reuse the available channels. But in such systems, a beam handover occurs very frequently and a dropping probability becomes very high compared with the one beam systems. In this paper, we propose the nondropping handover and channel allocation scheme in the above LEOs systems. In the proposed scheme, we allocate an extra idle channel for a new call. Because of the predictable change of channel reuse distances, each user can always use the same channel as before. Furthermore, we proposed some cost functions used by channel selection and channel reassignment. For comparison, we show the lower bound of blocking probability by maximal complete dependent set (MCDS). We confirm that the proposed channel selection scheme improves the system performance by computer simulation.
Study on New Ku-band Data Collection Satellite to Track Avian Influenza
Isao NAKAJIMA,Hiroshi JUZOJI,Toshihiko KITANO,Masaaki KATAYAMA 한국멀티미디어학회 2011 한국멀티미디어학회 국제학술대회 Vol.2011 No.-
This paper intends to point out some problem of telemetry for wild birds and future technical expectations to prevent Avian Influenza. For medium to large migratory birds, the data collection system aboard the NOAA meteorological satellites (the ARGOS system) has been able to map their migratory routes. However, recommended C/No for Doppler shift ill be 54㏈㎐, while calculated required C/No for 400 bps data uplink is 36㏈㎐. The gap between navigation function and data communication will be almost 18 ㏈. The bird has to pay this overload. We would like to propose the next generation digital transponder that is an advanced DCS with multi beam on Ku-band to perform the onboard processing (DCS and navigation system with Doppler shift). In case of 40㏈i antenna of the spacecraft, the ground terminal with 0㏈m RF-output and 2.25㏈i antenna (0.5㎝ in size) can transmit upto 50 bps with BPSK. This terminal attached with a leg of a bird will be suitable for a dove or a gull in size.
A Study on Cluster Lifetime in Multi-HopWireless Sensor Networks with Cooperative MISO Scheme
Zheng Huang,Hiraku Okada,Kentaro Kobayashi,Masaaki Katayama 한국통신학회 2012 Journal of communications and networks Vol.14 No.4
As for cluster-based wireless sensor networks (WSNs),cluster lifetime is one of the most important subjects in recent researches. Besides reducing the energy consumptions of the clusters,it is necessary to make the clusters achieve equal lifetimes so that the whole network can survive longer. In this paper, we focus on the cluster lifetimes in multi-hop WSNs with cooperative multiinput single-output scheme. With a simplified model of multi-hop WSNs, we change the transmission schemes, the sizes and transmission distances of clusters to investigate their effects on the cluster lifetimes. Furthermore, linear and uniform data aggregations are considered in our model. As a result, we analyze the cluster lifetimes in different situations and discuss the requirements on the sizes and transmission distances of clusters for equal lifetimes.