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Allergenicity of simple chemicals in house dust mites detected by patch tests
Hideo Nakayama,Akiko Kumei,Naoki Mori,Yasumasa Kuwahara 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
Eczema due to contact allergy is usually produced by simple chemicals with the molecules less than 500 KD. A total of 100 cultivated house dust mites (HDM) were extracted with their lipid components in hexane, and they were analyzed by mass measuring gas chromatography. The same components were mixed in petrolatum at 5% or less, and patch tested using Finn Chambers, and the results were read by ICDRG standards. α-Acaridial, contained in Tyrophagus putrescentiae, turned out to have been a primary sensitizer, and could make prurigo reactions. Geranial, a main lipid component in dermatophagoides, showed positive rates at 58.8% at 5% concentration in atopic dermatitis and was expected to cross react to geraniol in cosmetics and soaps. It means that when one is sensitized by HDM, eczema can be provoked and maintained by the usage of ordinary soaps, shampoos and cosmetics, containing geraniol.
Flow Visualization of Flowfield Structures around an Aerospike Nozzle using LIF and PSP
Tomohide NIIMI,Hideo MORI,Mashio TANIGUCHI 한국가시화정보학회 2004 KOREA-JAPAN Joint Seminar on Particle Image Veloci Vol.- No.-
Aerospike nozzles have been expected to be used for an engine of a reusable space shuttle to respond to growing demand for rocket-launching and its cost reduction. In this study, the flow field structures in any cross sections around clustered linear aerospike nozzles are visualized and analyzed, using laser induced fluorescence (LIF) of nitrogen monoxide seeded in the carrier gas of nitrogen. Since flow field structures are affected mainly by pressure ratio, the clustered linear aerospike nozzle is set inside a vacuum chamber to carry out the experiments in the wide range of pressure ratios from 75 to 200. Flow fields are visualized in several cross-sections, demonstrating the complicated three-dimensional flow field structures. Pressure sensitive paint (PSP) ofPtTFPP bound by poly-IBM-co-TFEM is also applied to measurement of the complicated pressure distribution on the spike surface, and to verification of contribution of a truncation plane to the thrust. Finally, to examine the effect of the sidewalls attached to the aerospike nozzle, the flow fields around the nozzle with the sidewalls are compared with those without sidewalls.
QAM-OFDM System with IDAR Method in Satellite Channel
Boonsrimuang, Pisit,Mori, Kazuo,Paungma, Tawil,Kobayashi, Hideo 통신위성우주산업연구회 2004 Joint Conference on Satellite Communications Vol.2004 No.-
The future satellite communications system is required to support the higher transmission data rate for providing the multimedia services by employing the efficient modulation method such as multi-level QAM. However, the employment of multi-level QAAM in the satellite channel would cause the fatal degradation of signal quality due to the non-linear amplifiers located at the earth station and satellite. To overcome this problem, we have proposed the multi-level QAM-OFDM technique with IDAR (Improved Decision Aided Reconstruction) method. In the IDAR method, the characteristic of non-linear amplifier is required as the known data at the receiver for mitigating the inter-modulation noise. This paper proposes the estimation method for AM-AM and AM-PM characteristics of non-linear amplifier by using the low PAPR (Peak to Averaged Power Ratio) preamble symbols. This paper presents various computer simulation results to verify the effectiveness of proposed method in the non-linear satellite channel.
Proposal of Estimation Method for Non-linear Amplifier Characteristics in Satellite Channel
Boonsrimuang, Pisit,Naito, Katsuhiro,Mori, Kazuo,Paungma, Tawil,Kobayashi, Hideo 통신위성우주산업연구회 2005 Joint Conference on Satellite Communications Vol.2005 No.-
OFDM technique having the higher PAPR performance has been considered as unsuitable transmission technique for the non-linear satellite channel. To solve this problem, we have already proposed the OFDM-IDAR method, which can mitigate the non-linear distortion and achieve the higher transmission data rate with keeping the better BER performance. In the IDAR method, however the input and output relationships of non-linear amplifier characteristics located at the transmit earth station and satellite are required at the receiver. This paper proposes the estimation method for AM-AM and AM-PM conversions characteristics of non-linear amplifiers by using low PAPR preamble symbols. The various computer simulations are conducted in this paper to verify the effectiveness of proposed method in the non-linear satellite channel.
Mkrtchyan, Gagik,Naito, Katsuhiro,Mori, Kazuo,Kobayashi, Hideo 통신위성우주산업연구회 2005 Joint Conference on Satellite Communications Vol.2005 No.-
In variety of mobile communication applications, there are a lot of necessities for the maximum Doppler spread estimation. As for the multi-path fading channels especially when there is no strong direct path, the Doppler spread estimation would become quite complicated problem. The conventional approach for Doppler spread estimation is usually based on the signal's autocorrelation calculation under the assumption of Jake's propagation model using the inverse of the first order Bessel's function. But this method has several drawbacks: it requires stationary and ergodic data signal, precise Bessel's function inversion and very long correlation time, all of which lead the inaccuracy estimation in the high mobility condition. In this paper we propose a novel Doppler spread estimation method using the time domain estimated channel's impulse response. This paper also demonstrates that the mean square value of time derivative of impulse response divided by the impulse response's mean square value is proportional to the square of the maximum Doppler spread. By using this fact, the proposed method can achieve the accurate estimation of Doppler spread. Computer simulations show that proposed method allows the accurate estimation of the Doppler spread from 10Hz to 1000Hz.
Proposal of QAM-OFDM System with DSI and IDAR Method in Satellite Channel
Boonsrimuang, Pisit,Naito, Katsuhiro,Mori, Kazuo,Paungma, Tawil,Kobayashi, Hideo 통신위성우주산업연구회 2005 Joint Conference on Satellite Communications Vol.2005 No.-
The future satellite communication systems are required to support the higher transmission data rate for providing the multimedia services by employing the efficient modulation method such as multi-level QAM. However, the employment of conventional single carrier transmission method with multilevel QAM would cause the fatal degradation of signal quality due to the non-linear amplifiers located at the earth station and satellite. To overcome this problem, we have proposed the multi-level QAM-OFDM technique with IDAR method designed for non-linear satellite channel. However, the proposed method could not mitigate the non-linear distortion sufficiently when modulation level becomes higher such as 64QAM. This paper proposes the combined scheme for PAPR reduction method employed at the transmitter and OFDM-IDAR method employed at the receiver so as to enable the usage of higher multi-level QAM method. The proposed method can achieve the higher transmission data rate with keeping the better bit error rate performance even in the non-linear satellite channel. The various computer simulations are conducted in this paper to verify the effectiveness of proposed method in the non-linear satellite channel.
FUEL CELL WASTE HEAT POWERED ADSORPTION COOLING SYSTEMS
SEUNG TAEK OH,BIDYUT BARAN SAHA,KEISHI KARIYA,YOSHINORI HAMAMOTO,HIDEO MORI 대한설비공학회 2013 International Journal Of Air-Conditioning and Refr Vol.21 No.2
In the present paper, the e®ect of desorption temperature on the performance of adsorption cooling systems driven by waste heat from fuel cells was analyzed. The studied adsorption cooling systems employ activated carbon ¯ber (ACF) of type A-20ethanol and RD type silica gelwater as adsorbentrefrigerant pairs. Two di®erent temperature levels of waste heat from polymer electrolyte fuel cell (PEFC) and solid oxide fuel cell (SOFC) are used as the heat source of the adsorption cooling systems. The adsorption cycles consist of one pair of adsorptiondesorption heat exchanger, a condenser and an evaporator. System performance in terms of speci¯c cooling capacity (SCC) and coe±cient of performance (COP) are determined and compared between the studied two systems. Results show that silica gelwater based adsorption cooling system is preferable for e®ective utilization of relatively lower temperature heat source. At relatively high temperature heat source, COP of ACFethanol based adsorption system shows better performance than that of silica gelwater based adsorption system.
Induction of allergic contact dermatitis by astigmatid mite-derived monoterpene, α-acaridial
Toshio Sasai,Yunosuke Hirano,Sayaka Maeda,Isamu Matsunaga,Atsushi Otsuka,Daisuke Morita,Ritsuo Nishida,Hideo Nakayama,Yasumasa Kuwahara,Masahiko Sugita,Naoki Mori 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
α-Acaridial [2(E)-(4-methyl-3-pentenyl)butenedial] is a novel monoterpene secreted from the house dust mites. Because of its molecular nature of a highly reactive, small lipidic compound, we addressed whether α-acaridial might function as a haptenic allergen that induced allergic contact dermatitis. Mice sensitized with α-acaridial were challenged by the same antigen on the ear skin. After 2 days, significant ear swelling with a prominent infiltration of CD4+ T lymphocytes was observed. In vitro, α-acaridial exhibited an outstanding ability to quickly interact with and chemically modify a reference protein. Virtually all cysteine residues and a sizable fraction of lysine residues were found to be selectively modified, suggesting that α-acaridial could potentially interact with any proteins. Previously, numerous mite-derived proteinaceous allergens have been associated with contact dermatitis. Our study now emphasizes that small lipidic compounds released from mites comprise a new class of mite allergens, and therefore, is of significant medical implications.