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Complex multiplier suited for FPGA structure

通讯和计算机（中英文版） 2009年第12期6卷 55-62页

作者： keiichi satoh Jubee Tad Yasutaka Tamura Gensuke Goto Department of System and Information Engineering Yamagata University Graduate School of Science and EngineeringKamikodanaka Nakahara-ku Kawasaki 211-8588 Japan Department of Informatics Yamagata University Graduate School of Science and Engineering Jonan Yonezawa 992-8510 Japan

In this paper, the author propose high- performance complex multipliers suited for Field-Programmable-Gate-Array (FPGA). The proposed complex multipliers are designed by effectively utilizing LUT (Look-Up-Table) and carry-chain which are basic components in FPGA. To design the circuits, the author utilize Radix-4 Booth algorithm for partial product generation and Wallace tree utilizing effectively LUTs and carry-chains for the partial product compression. The author estimated path delay and scale of the proposed complex multipliers by utilizing synthesis tool, and showed shorter path delay and smaller scale than circuits synthesized by VHDL operator ( , + , and - ).

关键词： FPGA 乘数 Wallace树结构有效利用路径延迟合成电路现场可编程

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Does massive intraabdominal free gas require surgical intervention?

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World Journal of Gastroenterology 2016年第32期22卷 7383-7388页

作者： Tadashi Furihata Makoto Furihata Kunibumi Ishikawa Masato Kosaka Naoki satoh keiichi Kubota Department of General Surgery Kyouwa Chuo Hospital Department of Gastroenterological Surgery Dokkyo Medical University

We describe a rare case of an 81-year-old man who presented with severe epigastralgia. A chest radiograph showed massive free gas bilaterally in the diaphragmatic spaces. Computed tomography(CT) scan also showed massive free gas in the peritoneal cavity with portal venous gas. We used a wait-andsee approach and carefully considered surgery again when the time was appropriate. The patient received conservative therapy with fasting, an intravenous infusion of antibiotics, and nasogastric intubation. The patient soon recovered and was able to start eating meals 4 d after treatment; thus, surgical intervention was avoided. Thereafter, colonoscopy examination showed pneumatosis cystoides intestinalis in the ascending colon. On retrospective review, CT scan demonstrated sporadic air-filled cysts in the ascending colon. The present case taught us a lesson: the presence of massive intraabdominal free gas with portal venous gas does not necessarily require surgical intervention. Pneumatosis cystoides intestinalis should be considered as a potential causative factor of free gas with portal venous gas when making the differential diagnosis.

关键词： Case reports Portal vein Pneumatosis cystoides intestinalis Colonoscopy General surgery

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East Asian VLBI Network observations of active galactic nuclei jets:imaging with KaVA+Tianma+Nanshan

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Research in Astronomy and Astrophysics 2021年第8期21卷 220-234页

作者： Yu-Zhu Cui Kazuhiro Hada Motoki Kino Bong-Won Sohn Jongho Park Hyun-Wook Ro Satoko Sawada-satoh Wu Jiang Lang Cui Mareki Honma Zhi-Qiang Shen Fumie Tazaki Tao An Ilje Cho Guang-Yao Zhao Xiao-Peng Cheng Kotaro Niinuma Kiyoaki Wajima Ying-Kang Zhang Noriyuki Kawaguchi Juan-Carlos Algaba Shoko Koyama Tomoya Hirota Yoshinori Yonekura Nobuyuki Sakai Bo Xia Yong-Bin Jiang Lin-Feng Yu Wei Gou Ju-Yeon Hwang Yong-Chen Jiang Yun-Xia Sun Dong-Kyu Jung Hyo-Ryoung Kim Jeong-Sook Kim Hideyuki Kobayashi Jee-Won Lee Jeong-Ae Lee Hua Zhang Guang-Hui Li Zhi-Qiang Xu Peng Li Jung-Hwan Oh Se-Jin Oh Chung-Sik Oh Tomoaki Oyama Duk-Gyoo Roh Katsunori-M.Shibata Wen Guo Rong-Bing Zhao Wei-Ye Zhong Jin-Qing Wang Wen-Jun Yang Hao Yan Jae-Hwan Yeom Bin Li Xiao-Fei Li Jian-Ping Yuan Jian Dong Zhong Chen Kazunori Akiyama keiichi Asada Do-Young Byun Yoshiaki Hagiwara Jeffrey Hodgson Tae-Hyun Jung Kee-Tae Kim Sang-Sung Lee Kunwoo Yi Qing-Hui Liu Xiang Liu Ru-Sen Lu Masanori Nakamura Sascha Trippe Na Wang Xue-Zheng Wang Bo Zhang Department of Astronomical Science The Graduate University for Advanced StudiesSOKENDAI2-21-1 OsawaMitakaTokyo 181-8588Japan Mizusawa VLBI Observatory National Astronomical Observatory of Japan2-12 HoshigaokaMizusawaOshuIwate 023-0861Japan Kogakuin University of Technology and Engineering Academic Support Center2665-1 NakanoHachiojiTokyo 192-0015Japan Korea Astronomy and Space Science Institute Yuseong-guDaejeon 34055Korea Department of Astronomy Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Korea Department of Astronomy and Space Science University of Science and Technology217 Gajeong-roDaejeonKorea Institute of Astronomy and Astrophysics Academia Sinica645 N Aohoku PIHiloHI 96720USA Graduate School of Sciences and Technology for Innovation Yamaguchi UniversityYoshida 1677-1YamaguchiYamaguchi 753-8512Japan Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China Institute of Astronomy The University of Tokyo2-21-1 OsawaMitakaTokyo 181-0015Japan Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomia s/nGranada E-18008Spain Department of Physics Faculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia Center for Astronomy Ibaraki University2-1-1 BunkyoMitoIbaraki 310-8512Japan Space Light Laboratory 77Yangjaedae-ro 86 roadGangdong-guSeoulKorea Massachusetts Institute of Technology Haystack Observatory 99 Millstone RoadWestfordMA 01886USA National Radio Astronomy Observatory 520 Edgemont RdCharlottesvilleVA 22903USA Toyo University 5-28-20 HakusanBunkyo-kuTokyo 112-8606Japan Department of Physics and Astronomy Seoul National UniversityGwanak-guSeoul 08826Korea Max Planck Institute for Radio Astronomy Auf dem hiigel 69Bonn 53121Germany SNU Astronomy Research Center Seoul National UniversityGwanak-guSeoul 08826Korea

The East Asian Very Long Baseline Interferometry(VLBI) Network(EAVN) is a rapidly evolving international VLBI array that is currently promoted under joint efforts among China,Japan and *** aims at forming a joint VLBI Network by combining a large number of radio telescopes distributed over East Asian *** the combination of the Korean VLBI Network(KVN) and the VLBI Exploration of Radio Astrometry(VERA) into Ka VA,further expansion with the joint array in East Asia is actively *** we report the first imaging results(at 22 and 43 GHz) of bright radio sources obtained with Ka VA connected to Tianma 65-m and Nanshan 26-m Radio Telescopes in *** test the EAVN imaging performance for different sources,we observed four active galactic nuclei(AGN) having different brightness and *** a result,we confirmed that the Tianma 65-m Radio Telescope(TMRT) significantly enhances the overall array sensitivity,a factor of 4 improvement in baseline sensitivity and 2 in image dynamic range compared to the case of Ka VA *** addition of the Nanshan 26-m Radio Telescope(NSRT) further doubled the east-west angular *** the resulting high-dynamic-range,high-resolution images with EAVN(Ka VA+TMRT+NSRT),various fine-scale structures in our targets,such as the counter-jet in M87,a kink-like morphology of the 3 C 273 jet and the weak emission in other sources are successfully *** demonstrates the powerful capability of EAVN to study AGN jets and to achieve other science goals in *** expansion of EAVN will further enhance the angular resolution,detection sensitivity and frequency coverage of the network.

关键词： galaxies:active galaxies:jets instrumentation:interferometers radio continuum:galaxies

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