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Kazuhiko Sakamoto,Tomohiro Sakaguchi,Zhaowu Jiang,Tarek Mohamed Naser,Kazuhiko Sekiguchi,Qingyue Wang,Katsuyuki Takahashi 한국대기환경학회 2007 한국대기환경학회 학술대회논문집 Vol.- No.-
To clarify the effect of the Diesel Vehicle Exhaust Gas Regulations enforced by Tokyo Metropolis, Saitama, Kanagawa, and Chiba Prefectures in October, 2003, we compared concentration of various chemical components in size-separated SPM and traffic volume of 2002 or 2003 (before the Regulation) to that of 2003 or 2004 (after the Regulation) at the road site of National Road Route 17 and Prefecture Road Route 57. Generally, decreasing tendency in EC concentration of each particle sizes was found from 2002 and 2003 to 2003 and 2004 sampling periods, respectively. Especially, decrease in average concentration of EC<SUB><2㎛</SUB> was clear. In the next, we analyzed various correlations of chemical components in size-separated SPM and traffic volume. From their results, we concluded decrease of the EC<SUB><2㎛</SUB> concentration at the roadside was caused by this Regulation. Also, we will discuss on long term trend of mass concentrations and chemical composition for SPM and fine particles observed at general environment and around the other trunk roads in the greater Tokyo Metropolitan Area.
Kazuhiko Kinoshita,Kazuki Ginnan,Keita Kawano,Hiroki Nakayama,Tsunemasa Hayashi,Takashi Watanabe 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
In recent years, LTE system with unlicensed bands is proposed. It can achieve not only to boost the capacity of cellular networks but also to use unlicensed bands effectively since LTE can achieve better spectrum efficiency than Wi-Fi. However, when LTE is introduced into an environment where Wi-Fi access points are already deployed, significant interference may be caused to Wi-Fi. Therefore, the coexistence of LTE and Wi-Fi with unlicensed bands is the problem. In this paper, we assume an environment where LTE base stations and Wi-Fi access points are deployed high-densely with unlicensed bands and co-channel interference frequently is caused. Then, we aim to enhance the average user throughput and its fairness through a centralized control of LTE and Wi-Fi. Specifically, we propose a channel assignment method and a users’ access system selection method using GA. The proposed method enhances both the average user throughput and the fairness of user throughput compared with conventional static channel assignment methods.
Kazuhiko Goto,Takenao Sugi,Yoshitaka Matsuda,Satoru Goto,Hiroki Fukuda,Yoshinobu Goto,Takao Yamasaki,Shozo Tobimatsu 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
Visual evoked potentials (VEPs) are the electrical responses from the brain concerned with visual information processing. Amplitude of VEPs is smaller than that of background EEG activity, and the stimulus-locked averaging method is usually used for obtained the waveform. VEP response to each stimulus is not completely the same however it is varying with its amplitude and duration. Therefore, amplitude of averaged VEP waveform deteriorates due to their variability in raw data. Feature extraction of background EEG activity during visual stimulation is also a one of significant items in VEP analysis. In that case, separation of VEP component and background EEG component (mainly posterior dominant rhythm) is crucial. In the past, we proposed the method of estimating both amplitude of VEP and dominant rhythm by use of EEG model. This present study, the proposed method was applied to actual recorded VEP data and its effectiveness was evaluated. EEGs with visual stimulus were recorded from nine healthy young adults. Usefulness of the proposed method was investigated by comparing the conventional power spectrum averaging method. The proposed method will be applicable to show an accurate VEP analysis and characteristic analysis of background activity under visual stimulus.
Kazuhiko KONISHI,최문보,이종욱 한국곤충학회 2012 Entomological Research Vol.42 No.1
East Asian species of the genera Hybrizon and Ghilaromma are reviewed. Four species of Hybrizon, H. buccatus (Brébisson 1825), H. ghilarovi Tobias, 1988, H. juncoi (Ceballos 1957) and H. flavofacialis Tobias, 1988 and two species of Ghilaromma, G. orientalis Tobias, 1988 and G. ussuriensis Tobias, 1988, were recognized. H. ghilarovi was recorded from Korea, Japan and China, while H. juncoi was recorded from Korea, for the first time. The specimens recorded from Japan as G. fuliginosi (Wilkinson, 1930) by Watanabe (1984) are referred to G.orientalis herein. This species is newly recorded from Korea and Japan. Keys to East Asian species of Hybrizon and the world species of Ghilaromma are also provided.
On spin alternating group actions on spin 4-manifolds
Kazuhiko Kiyono,Ximin Liu 대한수학회 2006 대한수학회지 Vol.43 No.6
LetX be a smooth, closed, connected spin 4-manifoldwith b1(X ) = 0 and signature (X ). In this paper we use Seiberg-Witten theory to prove that ifX admits a spin alternating A4action, then b+2 (X ) j (X )j=8 + 3 under some non-degeneracyconditions.