Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Chikara Kojima"'
Autor:
Masahiko Shimizu, Yoji Ohashi, Takenori Ohshima, Hiroshi Ashida, Toshihiro Shimura, Kenichi Nishikawa, Chikara Kojima, Shunsuke Fujio, Shohei Ishikawa, Zhengyi Li, Atsushi Honda, Kazuyuki Ozaki
Publikováno v:
PIMRC
In this paper, we propose a novel two-step beam search method for multi-user in millimeter-wave communication and show the experimental evaluation. The numbers of search beams in the first and second steps are theoretically optimized. The evaluation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ee5fa4ffd5de7975e539c46521c1af9
https://doi.org/10.1109/pimrc.2017.8292208
https://doi.org/10.1109/pimrc.2017.8292208
Autor:
Takenori Ohshima, Zhengyi Li, Kazuyuki Ozaki, Atsushi Honda, Hiroshi Ashida, Chikara Kojima, Masahiko Shimizu, Kenichi Nishikawa, Shohei Ishikawa, Toshihiro Shimura, Yoji Ohashi, Shunsuke Fujio
Publikováno v:
PIMRC
The research on millimeter-wave communication is very hot all over the world because of the large bandwidth and beamforming. However, the high power consumption due to the large number of high speed DACs/ADCs is the obstacle of utilizing full digital
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ef9480db222eda9e8d51e51a6495ed5b
https://doi.org/10.1109/pimrc.2017.8292487
https://doi.org/10.1109/pimrc.2017.8292487
Autor:
Ruben Orihuela, Chikara Kojima, Erik J. Tokar, Rachel J. Person, Yuanyuan Xu, Wei Qu, Michael P. Waalkes
Publikováno v:
Toxicology Mechanisms and Methods. 23:389-395
The carcinogen inorganic arsenic (iAs) undergoes biomethylation (BMT) in some cells. The methylated metabolite, monomethylarsonous (MMA(3+)), may cause oxidative DNA damage (ODD). With chronic iAs exposure, BMT-competent cells show ODD while BMT-defi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46dcf1892752f4793875727bbcbb3734
https://doi.org/10.3109/15376516.2012.762570
https://doi.org/10.3109/15376516.2012.762570
System validation of millimeter-wave beam multiplexing with interleaved hybrid beam-forming antennas
Autor:
Atsushi Honda, Kazuyuki Ozaki, Chikara Kojima, Zhengyi Li, Toshihiro Shimura, Takenori Ohshima, Masahiko Shimizu, Kenichi Nishikawa, Hiroshi Ashida, Shohei Ishikawa, Shunsuke Fujio, Yoji Ohashi
Publikováno v:
PIMRC
This paper describes beam division multiplexing at millimeter wave band using interleaved hybrid beam-forming (BF) antennas. The antenna elements are located alternately to make narrow beam-width of about 5 degrees, and the user multiplexing calculat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f8333f1a6913933f0cfcff1389251e6
https://doi.org/10.1109/pimrc.2016.7794711
https://doi.org/10.1109/pimrc.2016.7794711
Autor:
Toshihiro Shimura, Shunsuke Fujio, Hiroshi Ashida, Atsushi Honda, Kenichi Nishikawa, Chikara Kojima, Zhengyi Li, Yoji Ohashi, Takenori Ohshima, Masahiko Shimizu, Shohei Ishikawa, Kazuyuki Ozaki
Publikováno v:
PIMRC
This paper considers millimeter-wave access network systems with space division multiple access using an interleaved subarray hybrid beamforming structure, where antenna elements in each subarray scatter uniformly over the whole antenna array. The st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2c9c00165eb44fbc166eb711723b31f4
https://doi.org/10.1109/pimrc.2016.7794677
https://doi.org/10.1109/pimrc.2016.7794677
Autor:
Shunsuke Fujio, Shohei Ishikawa, Toshihiro Shimura, Masahiko Shimizu, Kazuyuki Ozaki, Atsushi Honda, Hiroshi Ashida, Takenori Ohshima, Li Zhengyi, Chikara Kojima, Kenichi Nishikawa, Makoto Yoshida, Yoji Ohashi
Publikováno v:
PIMRC
A millimeter-wave beam multiplexing method using a hybrid beamforming is proposed. We theoretically show that inter-subarray coding at the subarray type interleaved configuration can reduce interference and multiple beams of the same high gain as the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e04e70c6d99472c4825074029a3b3542
https://doi.org/10.1109/pimrc.2016.7794691
https://doi.org/10.1109/pimrc.2016.7794691
Autor:
Kazuyuki Ozaki, Hideyuki Kobayashi, Yasuharu Amezawa, Chikara Kojima, Hiroshi Fujita, Yun Wen
Publikováno v:
VTC Spring
Automated interference detection is required for operation and management services in wireless networks as Wireless Local Area Networks (WLANs) based on IEEE 802.11 Standard since co-channel interference from other wireless transmitters occurs irregu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97421c395551e285c33e7dc0e85c2075
https://doi.org/10.1109/vtcspring.2015.7145661
https://doi.org/10.1109/vtcspring.2015.7145661
Autor:
Chikara Kojima, Y Kobayashi, Masumi H Sakurai, Teruaki Sakurai, S Himeno, M P Waalkes, S Hirano
Publikováno v:
British Journal of Pharmacology. 149:888-897
Background and purpose: Although inorganic arsenite (AsIII) is toxic in humans, it has recently emerged as an effective chemotherapeutic agent for acute promyelocytic leukemia (APL). In humans and most animals, AsIII is enzymatically methylated in th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c4043a0c1517872e366538c0f230143c
https://doi.org/10.1038/sj.bjp.0706899
https://doi.org/10.1038/sj.bjp.0706899
Publikováno v:
Applied Organometallic Chemistry. 20:549-556
Inorganic arsenicals are distinctly toxic and carcinogenic to humans. Inorganic arsenite (As III ) and arsenate (AS V ) are enzymatically methylated to monomethylarsonic acid (MMAS V ) and dimethylarsinic acid (DMAS V ) in mammals. Recent reports ind
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9d30210299d541e523c20e2d1e15cce5
https://doi.org/10.1002/aoc.1072
https://doi.org/10.1002/aoc.1072
Publikováno v:
Applied Organometallic Chemistry. 19:226-230
In this study, we observed the first in vivo acute immunotoxicity of a trimethyl(2-hydroxyethyl)arsonium cation, namely arsenocholine (AsCho), which is present in marine animals that are ingested daily as seafood in many countries. It has been report
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3cbb8d9aeda3ebbfa7d674fbe7d2f33a
https://doi.org/10.1002/aoc.695
https://doi.org/10.1002/aoc.695