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Where, When, and How mmWave is Used in 5G and Beyond
SAKAGUCHI, Kei,HAUSTEIN, Thomas,BARBAROSSA, Sergio,STRINATI, Emilio Calvanese,CLEMENTE, Antonio,DESTINO, Giuseppe,PÄ,RSSINEN, Aarno,KIM, Ilgyu,CHUNG, Heesang,KIM, Junhyeong,KEUSGEN, Wilhelm,WEILER 'Institute of Electronics, Information and Communi 2017 IEICE transactions on electronics Vol.100 No.10
Kei Matsumoto,Shinwa Tanaka,Takashi Toyonaga,Nobuaki Ikezawa,Mari Nishio,Masanao Uraoka,Tomoatsu Yoshihara,Hiroya Sakaguchi,Hirofumi Abe,Tetsuya Yoshizaki,Madoka Takao,Toshitatsu Takao,Yoshinori Morit 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.1
Background/Aims: The anastomotic site after distal gastrectomy is the area most affected by duodenogastric reflux. Differentreconstruction methods may affect the lesion characteristics and treatment outcomes of remnant gastric cancers at the anastomoticsite. We retrospectively investigated the clinicopathologic and endoscopic submucosal dissection outcomes of remnant gastriccancers at the anastomotic site. Methods: We recruited 34 consecutive patients who underwent endoscopic submucosal dissection for remnant gastric cancer at theanastomotic site after distal gastrectomy. Clinicopathology and treatment outcomes were compared between the Billroth II and non-Billroth II groups. Results: The tumor size in the Billroth II group was significantly larger than that in the non-Billroth II group (22 vs. 19 mm;p=0.048). More severe gastritis was detected endoscopically in the Billroth II group (2 vs. 1.33; p=0.0075). Moreover, operation timewas longer (238 vs. 121 min; p=0.004) and the frequency of bleeding episodes was higher (7.5 vs. 3.1; p=0.014) in the Billroth IIgroup. Conclusions: Compared to remnant gastric cancers in non-Billroth II patients, those in the Billroth II group had larger lesions with abackground of severe remnant gastritis. Endoscopic submucosal dissection for remnant gastric cancers in Billroth II patients involvedlonger operative times and more frequent bleeding episodes than that in patients without Billroth II.
STBC-MIMO Network Coding with Adaptive Modulation
Kousuke Fukuda,Fumie Ono,Kei Sakaguchi 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In this paper, an enhanced STBC-MIMO network coding is proposed. The enhanced STBC-MIMO network coding uses the adaptive modulation and demodulation. It can broadcast the signals by modulation and demodulation every link by link. Moreover, throughput performance of enhanced STBC-MIMO network coding is evaluated by computer simulation. As a result, the proposed network coding is superior to conventional network coding.
Influence of Channel Estimation Error on the Performance of MIMO Mesh Network
Masayuki Uchida,Fumie Ono,Kei Sakaguchi 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In this paper, a method of channel estimation in MIMO mesh network is considered and influence of a channel estimation error is evaluated. The MIMO mesh network can realize highly efficient multi-hop network by using network oriented interference cancellation and spatial multiplexing of bi-directional signal. In this paper, it was clarified that throughput performance that takes into account channel estimation error of MIMO mesh network is about two times higher than that of SISO network.
Kojima, Takahiko,Nakayama, Kazuya,Sakaguchi, Miyuki,Ogura, Takashi,Ohkubo, Kei,Fukuzumi, Shunichi American Chemical Society 2011 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.133 No.44
<P>Ruthenium(II)–acetonitrile complexes having η<SUP>3</SUP>-tris(2-pyridylmethyl)amine (TPA) with an uncoordinated pyridine ring and diimine such as 2,2′-bipyridine (bpy) and 2,2′-bipyrimidine (bpm), [Ru<SUP>II</SUP>(η<SUP>3</SUP>-TPA)(diimine)(CH<SUB>3</SUB>CN)]<SUP>2+</SUP>, reacted with <I>m</I>-chloroperbenzoic acid to afford corresponding Ru(II)–acetonitrile complexes having an uncoordinated pyridine-<I>N</I>-oxide arm, [Ru<SUP>II</SUP>(η<SUP>3</SUP>-TPA-O)(diimine)(CH<SUB>3</SUB>CN)]<SUP>2+</SUP>, with retention of the coordination environment. Photoirradiation of the acetonitrile complexes having diimine and the η<SUP>3</SUP>-TPA with the uncoordinated pyridine-<I>N</I>-oxide arm afforded a mixture of [Ru<SUP>II</SUP>(TPA)(diimine)]<SUP>2+</SUP>, intermediate-spin (<I>S</I> = 1) Ru(IV)–oxo complex with uncoordinated pyridine arm, and intermediate-spin Ru(IV)–oxo complex with uncoordinated pyridine-<I>N</I>-oxide arm. A Ru(II) complex bearing an oxygen-bound pyridine-<I>N</I>-oxide as a ligand and bpm as a diimine ligand was also obtained, and its crystal structure was determined by X-ray crystallography. Femtosecond laser flash photolysis of the isolated <I>O</I>-coordinated Ru(II)–pyridine-<I>N</I>-oxide complex has been investigated to reveal the photodynamics. The Ru(IV)–oxo complex with an uncoordinated pyridine moiety was alternatively prepared by reaction of the corresponding acetonitrile complex with 2,6-dichloropyridine-<I>N</I>-oxide (Cl<SUB>2</SUB>py-O) to identify the Ru(IV)–oxo species. The formation of Ru(IV)–oxo complexes was concluded to proceed via intermolecular oxygen atom transfer from the uncoordinated pyridine-<I>N</I>-oxide to a Ru(II) center on the basis of the results of the reaction with Cl<SUB>2</SUB>py-O and the concentration dependence of the consumption of the starting Ru(II) complexes having the uncoordinated pyridine-<I>N</I>-oxide moiety. Oxygenation reactions of organic substrates by [Ru<SUP>II</SUP>(η<SUP>3</SUP>-TPA-O)(diimine)(CH<SUB>3</SUB>CN)]<SUP>2+</SUP> were examined under irradiation (at 420 ± 5 nm) and showed selective allylic oxygenation of cyclohexene to give cyclohexen-1-ol and cyclohexen-1-one and cumene oxygenation to afford cumyl alcohol and acetophenone.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2011/jacsat.2011.133.issue-44/ja207572z/production/images/medium/ja-2011-07572z_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja207572z'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja207572z'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja207572z'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja207572z'>ACS Electronic Supporting Info</A></P>