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Blockchain-based cross-domain authorization system for user-centric resource sharing

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Blockchain(Research and Applications) 2023年第2期4卷 67-81页

作者： Yuki Ezawa Shohei Kakei Yoshiaki Shiraishi masami Mohri Masakatu Morii Department of Electrical and Electronic Engineering Kobe UniversityKobeHyogo657-8501Japan Department of Computer Science Nagoya Institute of TechnologyNagoyaAichi466-8555Japan Faculty of Informatics Kindai UniversityHigashi-OsakaOsaka577-8502Japan

User-centric data sharing is essential to encourage citizens'active participation in the digital *** key to smart cities,a form of the digital economy,is the promotion of public use of citizen ***,it is not easy to utilize data without citizens’*** this study,we took a technological approach to these *** access(UMA)is a well-known framework for delegating resource access rights to others on the *** UMA,authorization mechanisms are designed to be centralized so that resource owners can centrally manage access rights for various resources stored in different ***,the lack of transparency in the authorization mechanism is a barrier to its implementation in large-scale systems such as smart *** this study,we developed a blockchain-based cross-domain authorization architecture that enables a resource-sharing ecosystem in which organizations that wish to utilize data can freely trade with each *** proposed architecture solves the transparency problem that conventional authorization systems have had by designing the authorization mechanism on blockchain *** implemented the proposed architecture as smart contracts and evaluated its processing *** resultant time required for delegating access rights and accessing resources was less than 500 ***,we found that the fluctuation in the processing time overhead was *** on these results,we concluded that performance degradation with the proposed architecture is minor.

关键词： Access control Authorization Blockchain Hyperledger fabric User-managed access

Emissions of particulate matter and associated polycyclic aromatic hydrocarbons from agricultural diesel engine fueled with degummed,deacidified mixed crude palm oil blends

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Journal of Environmental Sciences 2013年第4期25卷 751-757页

作者： Khamphe Phoungthong Surajit Tekasakul Perapong Tekasakul Gumpon Prateepchaikul Naret Jindapetch masami Furuuchi Mitsuhiko Hata Department of Chemistry and Center of Excellence for Innovation in Chemistry(PERCH-CIC) Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla 90112Thailand Energy Technology Research Center and Department of Mechanical Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90112Thailand National Center of Excellence for Environmental and Hazardous Waste Management(EHWM) Southern Consortium Universities at Prince of Songkla University Hat YaiSongkhla 90112Thailand Graduate School of Natural Science and Technology Kanazawa UniversityKakuma-machiKanazawa 920-1162Japan

Mixed crude palm oil （MCPO）, the mixture of palm fiber oil and palm kernel oil, has become of great interest as a renewable energy source. It can be easily extracted from whole dried palm fruits. In the present work, the degummed, deacidified MCPO was blended in petroleum diesel at portions of 30% and 40% by volume and then tested in agricultural diesel engines for long term usage. The particulates from the exhaust of the engines were collected every 500 hr using a four-stage cascade air sampler. The 50% cut-off aerodynamic diameters for the first three stages were 10, 2.5 and 1μm, while the last stage collected all particles smaller than 1 μm. Sixteen particle bounded polycyclic aromatic hydrocarbons （PAHs） were analyzed using a high performance liquid chromatography. The results indicated that the size distribution of particulate matter was in the accmnulation mode and the pattern of total PAHs associated with fine-particles （〈 1 μm） showed a dominance of larger molecular weight PAHs （4--6 aromatic rings）, especially pyrene. The mass median diameter, PM and total PAH concentrations decreased when increasing the palm oil content, but increased when the running hours of the engine were increased. In addition, Commercial petroleum diesel （PB0） gave the highest value of carcinogenic potency equivalent （BaPeq） for all particle size ranges. As the palm oil was increased, the; BaPeq decreased gradually. Therefore the degununed-deacidified MCPO blends are recommended for diesel substitute.

关键词： mixed crude palm oil palm oil blend agricultural diesel engine potycyclic aromatic hydrocarbon particulate matter

Characterization of the genes involved in nitrogen cycling in wastewater treatment plants using DNA microarray and most probable number-PCR

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Frontiers of Environmental Science & Engineering 2016年第4期10卷 61-70页

作者： Junqin PANG masami MATSUDA Masashi KURODA Daisuke INOUE Kazunari SEI Kei NISHIDA Michihiko IKE Division of Sustainable Energy and Environmental Engineering Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan International Research Centre for River Basin Environment University of Yamanashi 4-3-11 Takeda Kofu Yamanashi 400-8511 Japan

To improve nitrogen removal performance of wastewater treatment plants （WWTPs）, it is essential to understand the behavior of nitrogen cycling communities, which comprise various microorganisms. This study characterized the quantity and diversity of nitrogen cycling genes in various processes of municipal WWTPs by employing two molecular-based methods：most probable number-polymerase chain reaction （MPN-PCR） and DNA microarray. MPN-PCR analysis revealed that gene quantities were not statistically different among processes, suggesting that conventional actwated sludge processes （CAS） are similar to nitrogen removal processes in their ability to retain an adequate population of nitrogen cycling microorganisms. Furthermore, most processes in the WWTPs that were researched shared a pattern：the nitS and the bacterial amoA genes were more abundant than the nirK and archaeal amoA genes, respectivelv. DNA microarray analysis revealed that several kinds of nitrification and denitrification genes were detected in both CAS and anaerobic-oxic processes （AO）, whereas limited genes were detected in nitrogen removal processes. Results of this study suggest that CAS maintains a diverse community of nitrogen cycling microorganisms; moreover, the microbial communities in nitrogen removal processes may be specific.

关键词： DNA microarray analysis Nitrogen cycling functional genes Most probable number-polymerase chainreaction (MPN-PCR)Wastewater treatment plants (WWTPs)

Randomized controlled trial of pancreatic stenting to prevent pancreatitis after endoscopic retrograde cholangiopancreatography

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World Journal of Gastroenterology 2012年第14期18卷 1635-1641页

作者： Yoshiaki Kawaguchi masami Ogawa Fumio Omata Hiroyuki Ito Tooru Shimosegawa Tetsuya Mine Division of Gastroenterology Tokai University School of MedicineIsehara 259-1193Japan Division of Gastroenterology Tohoku University Graduate School of Medicine1-1 Seiryo-machiAobakuSendai CityMiyagi 980-8574Japan

AIM:To determine the effectiveness of pancreatic duct(PD) stent placement for the prevention of pancreatitis after endoscopic retrograde cholangiopancreatography(ERCP) in high risk ***:Authors conducted a single-blind,randomized controlled trial to evaluate the effectiveness of a pancreatic spontaneous dislodgement stent against post-ERCP pancreatitis,including rates of spontaneous dislodgement and *** defined high risk patients as having any of the following:sphincter of Oddi dysfunction,difficult cannulation,prior history of post-ERCP pancreatitis,pre-cut sphincterotomy,pancreatic ductal biopsy,pancreatic sphincterotomy,intraductal ultrasonography,or a procedure time of more than 30 *** were randomized to a stent group(n = 60) or to a non-stent group(n = 60).An abdominal radiograph was obtained daily to assessspontaneous stent ***-ERCP pancreatitis was diagnosed according to consensus ***:The mean age(± standard deviation) was 67.4 ± 13.8 years and the male:female ratio was 68:*** the stent group,the mean age was 66 ± 13 years and the male:female ratio was 33:27,and in the non-stent group,the mean age was 68 ± 14 years and the male:female ratio was 35:*** were no significant differences between groups with respect to age,gender,final diagnosis,or type of endoscopic *** frequency of post-ERCP pancreatitis in PD stent and non-stent groups was 1.7%(1/60) and 13.3%(8/60),*** severity of pancreatitis was mild in all *** frequency of post-ERCP pancreatitis in the stent group was significantly lower than in the non-stent group(P = 0.032,Fisher's exact test).The rate of hyperamylasemia were 30%(18/60) and 38.3%(23 of 60) in the stent and non-stent groups,respectively(P = 0.05,χ2 test).The placement of a PD stent was successful in all 60 *** rate of spontaneous dislodgement by the third day was 96.7%(58/60),and the median(range) time to dislodgement was 2.1(2-

关键词： Endoscopic retrograde cholangiopancreatography Pancreatitis Postoperative complications Prophylaxis Stents

A Contribution to Guy's Conjecture

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Acta Mathematica Sinica,English Series 2022年第10期38卷 1856-1886页

作者： Yukio MATSUMOTO Yoshikazu MATSUTANI Angel MONTESINOS-AMILIBIA masami ODA Shuichi OHKI Tsuyoshi SAKAI Department of Mathematics Gakushuin UniversityMejiroToshima-kuTokyo 171-8588Japan 3-21-1-901 Minamimachi KokubunjiTokyo 185-0021Japan Calle Rio Alberche 8.05260 CebrerosSpain Tsuda University 2-1-1Tsuda-choKodairaTokyo 187-8577Japan Tokyo Japanese Language Educational Center 3-22-7Kita ShinjukuShinjuku-kuTokyo 169-0074Japan Department of Mathematics College of Humanities and SciencesNihon UniversitySetagaya-kuTokyo 156-0045Japan

Let Kdenote the complete graph consisting of n vertices,every pair of which forms an *** want to know the least possible number of the intersections,when we draw the graph Kon the plane or on the sphere using continuous arcs for *** a paper published in 1960,Richard *** conjectured that the least possible number of the intersections is 1/64(n-1)^(2)(n-3)^(2) if n is odd,or 1/64 n(n-2)^(2)(n-4)if n is even.A virgin road V_(n)is a drawing of a Hamiltonian cycle in Kconsisting of n vertices and n edges such that no other edge-representing arcs cross V.A drawing of Kis called virginal if it contains a virgin *** drawings considered in this paper will be virginal with respect to a fixed virgin road *** will present a certain drawing of a subgraph of K,for each n(≥5),which is"characteristic"in the sense that any minimal virginal drawing of Kcontaining this subdrawing satisfies Guy’s conjecture.

关键词： Complete graph virginal drawing Guy’s conjecture

Interaction between basigin and monocarboxylate transporter 2 in the mouse testes and spermatozoa

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Asian Journal of Andrology 2016年第4期18卷 600-606页

作者： Cheng Chen Mamiko Maekawa Kenji Yamatoya masami Nozaki Chizuru Ito Toshihiko Iwanaga Kiyotaka Toshimori Department of Anatomy and Developmental Biology Graduate School of Medicine Chiba University Chiba Japan Department of Cell Biology Research Institute for Microbia Diseases Osaka University Osaka Japan Laboratory of Histology and Cytology Department of Anatomy Graduate School of Medicine Hokkaido University Hokkaido Japan

Basigin is a member of the immunoglobulin superfamily and plays various important roles in biological events including spermatogenesis. To examine the basigin molecular variants during spermatogenesis and sperm maturation in the mouse, immunoprecipitated basigin samples from testis and epididymal spermatozoa were analyzed by liquid chromatography-mass spectrometry/mass spectrometry （LC-MS/MS）. The results demonstrated that basigin molecules from the testis and spermatozoa were separable into two major bands and that the differences in the molecular sizes were possibly because of an endoproteolytic cleavage. Since basigin is known to be a chaperone for the monocarboxylate transporter 1 （MCT1）, the localization of basigin, MCT1 and MCT2 was examined during postnatal testicular development. Immunohistochemical studies showed different expression patterns of MCT1 and MCT2. MCT1 was localized on the surface of spermatogonia, spermatocytes, and spermatids. In contrast, MCT2 appeared on the principal piece of spermatozoa in the testis, where basigin was also observed. In mature epididymal spermatozoa, MCT2 was located on the midpiece, where basigin co-localized with MCT2 but not with MCT1. Furthermore, MCT2 was immunoprecipitated with basigin in mouse testes and sperm. These results suggest that basigin has a functional role as a binding partner with MCT2 in testicular and epididymal spermatozoa.

关键词： basigin monocarboxylate transporter sperm maturation spermatogenesis spermatozoa testis

Characteristics of nanoparticles emitted from burning of biomass fuels

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Journal of Environmental Sciences 2014年第9期26卷 1913-1920页

作者： Mitsuhiko Hata Jiraporn Chomanee Thunyapat Thongyen Linfa Bao Surajit Tekasakul Perapong Tekasakul Yoshio Otani masami Furuuchi College of Science and Engineering Kanazawa UniversityKakuma-machiKanazawaIshikawa 920-1192Japan Department of Chemistry Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla 90112Thailand Graduate School of Natural Science and Technology Kanazawa UniversityKakuma-machiKanazawaIshikawa 920-1192Japan Energy Technology Research Center and Department of Mechanical EngineeringFaculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90112Thailand National Center of Excellence for Environmental and Hazardous Waste Management (EHWM) Southern Consortium Universities at Prince ofSongkla UniversityHat YaiSongkhla 90112Thailand

The characteristics of the particles of the smoke that is emitted from the burning ofbiomass fuels were experimentally investigated using a laboratory-scale tube furnace and different types of biomass fuels： rubber wood, whole wood pellets and rice husks. Emitted amounts of particles, particle-bound polycyclic aromatic hydrocarbons （PAHs） and water-soluble organic carbon （WSOC） are discussed relative to the size of the emitted particles, ranging to as small as nano-size （〈70 nm）, and to the rate of heating rate during combustion, differential thermal analysis （DTA） and thermogravimetric analysis （TG） techniques were used to examine the effect of heating rate and biomass type on combustion behaviors relative to the characteristics of particle emissions. In the present study, more than 30% of the smoke particles from the burning ofbiomass fuel had a mass that fell within a range of 〈 100 nm. Particles smaller than 0.43 μm contributed greatly to the total levels of toxic PAHs and WSOC. The properties of these particles were influenced by the fuel component, the combustion conditions, and the particle size. Although TC--DTA results indicated that the heating rate in a range of 10-20℃did not show a significant effect on the combustion properties, there was a slight increase in the decomposition temperature as heating rate was increased. The nano-size particles had the smallest fraction of particle mass and particle-bound PAHs, but nonetheless these particles registered the largest fraction of particle-bound WSOC.

关键词： Wood biomassNano-particlesPolycyclic aromatic hydrocarbonsWater-soluble organic carbon

Quantitative evaluation of deep convolutional neural network-based image denoising for low-dose computed tomography

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Visual Computing for Industry,Biomedicine,and Art 2021年第1期4卷 199-207页

作者： Keisuke Usui Koichi Ogawa masami Goto Yasuaki Sakano Shinsuke Kyougoku Hiroyuki Daida Department of Radiological Technology Faculty of Health ScienceJuntendo UniversityTokyo 113-8421Japan Department of Radiation Oncology Faculty of MedicineJuntendo UniversityTokyo 113-8421Japan Faculty of Science and Engineering Hosei UniversityTokyo 184-8584Japan

To minimize radiation risk,dose reduction is important in the diagnostic and therapeutic applications of computed tomography(CT).However,image noise degrades image quality owing to the reduced X-ray dose and a possible unacceptably reduced diagnostic *** learning approaches with convolutional neural networks(CNNs)have been proposed for natural image denoising;however,these approaches might introduce image blurring or loss of original *** aim of this study was to compare the dose-dependent properties of a CNN-based denoising method for low-dose CT with those of other noise-reduction methods on unique CT noise-simulation *** simulate a low-dose CT image,a Poisson noise distribution was introduced to normal-dose images while convoluting the CT unit-specific modulation transfer *** abdominal CT of 100 images obtained from a public database was adopted,and simulated dose-reduction images were created from the original dose at equal 10-step dose-reduction intervals with a final dose of 1/*** images were denoised using the denoising network structure of CNN(DnCNN)as the general CNN model and for transfer *** evaluate the image quality,image similarities determined by the structural similarity index(SSIM)and peak signal-to-noise ratio(PSNR)were calculated for the denoised *** better denoising,in terms of SSIM and PSNR,was achieved by the DnCNN than by other image denoising methods,especially at the ultra-low-dose levels used to generate the 10%and 5%dose-equivalent ***,the developed CNN model can eliminate noise and maintain image sharpness at these dose levels and improve SSIM by approximately 10%from that of the original *** contrast,under small dose-reduction conditions,this model also led to excessive smoothing of the *** quantitative evaluations,the CNN denoising method improved the low-dose CT and prevented over-smoothing by tailoring the CNN model.

关键词： Deep learning Convolutional neural network Low-dose computed tomography Denoising Image quality

Amenorrhea as a rare drug-related adverse event associated with everolimus for pancreatic neuroendocrine tumors

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World Journal of Gastroenterology 2014年第42期20卷 15920-15924页

作者： Yoshiaki Kawaguchi Atsuko Maruno Yohei Kawashima Hiroyuki Ito masami Ogawa Tetsuya Mine Department of Gastroenterology Tokai University School of Medicine

The patient was an asymptomatic 43-year-old woman. Abdominal ultrasonography and enhanced computed tomography showed a tumor lesion accompanied by multiple cystic changes in the liver and the pancreatic tail. Endoscopic ultrasound-fine needle aspiration was performed on the pancreatic tumor lesion and revealed pancreatic neuroendocrine tumor(PNET). As it was unresectable due to multiple liver metastases, the decision was made to initiate treatment with everolimus and transcatheter arterial chemoembolization. The patient ceased menstruating after the start of everolimus administration. When the administration was discontinued due to interstitial lung disease, menstruation resumed, but then again stopped with everolimus resumption. An association between everolimus and amenorrhea was highly suspected. Amenorrhea occurred as a rare adverse event of everolimus. As the younger women might be included in PNETs patients, we should put this adverse event into consideration.

关键词： Amenorrhea Everolimus Neuroendocrine tumor Pancreas Adverse event