检索结果-南通市图书馆

An interactive rendering system using hierarchical data structure for earth-scale clouds

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2010年第5期53卷 920-931页

作者： DOBASHI Yoshinori yamamoto Tsuyoshi NISHITA Tomoyuki Graduate School of Information Science and Technology Hokkaido University Graduate School of Frontier Science The University of Tokyo

This paper presents an interactive system for realistic visualization of earth-scale clouds. Realistic images can be generated at interactive frame rates while the viewpoint and the sunlight directions can be changed interactively. The realistic display of earth-scale clouds requires us to render large volume data representing the density distribution of the clouds. However, this is generally time-consuming and it is difficult to achieve the interactive performance, especially when the sunlight direction can be changed. To address this, our system precomputes the integrated intensities and opacities of clouds for various viewing and sunlight directions. This idea is combined with a novel hierarchical data structure for further acceleration. The photorealism of the final image is improved by taking into account the atmospheric effects and shadows of clouds on the earth. We demonstrate the usefulness of our system by an application to a space flight simulation.

关键词： computer graphics efficient rendering large-scale clouds level of detail light scattering

^(18)F-fluorodeoxyglucose positron emission tomography in the diagnosis of small pancreatic cancer

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2011年第2期17卷 231-235页

作者： Keiichi Okano Keitaro Kakinoki Shintaro Akamoto Masanobu Hagiike hisashi Usuki Yuka yamamoto Yoshihiro Nishiyama Yasuyuki Suzuki Department of Gastroenterological Surgery Faculty of MedicineKagawa University Department of Radiology Faculty of MedicineKagawa University

AIM:To investigate the role of 18 F-fluorodeoxyglucose positron emission tomography(FDG-PET) in the diagnosis of small pancreatic cancer. METHODS:This study involved 31 patients with proven invasive ductal cancer of the *** patients were divided into 3 groups according to the maximum diameter of the tumor:TS1(maximum tumor size≤2.0 cm) ,TS2(>2.0 cm and≤4.0 cm) or TS3-4(>4.0 cm) .The relationships between the TS and various diagnostic tools,including FDG-PET with dual time point evaluation,were analyzed. RESULTS:The tumors ranged from 1.3 to 11.0 cm in *** of the 31 patients(97%) had a positive FDG-PET *** were 5 patients classified as TS1,15 as TS2 and 11 as *** sensitivity of FDG-PET,computed tomography(CT) and magnetic resonanceimaging(MRI) were 100%,40%,0%in TS1,93%,93%,89%in TS2 and 100%,100%,100%in TS3-4. The sensitivity of FDG-PET was significantly higher in comparison to CT and MRI in patients with TS1(P< 0.032) .The mean standardized uptake values(SUVs) did not show a significant difference in relation to the TS(TS1:5.8±4.5,TS2:5.7±2.2,TS3-4:8.2±3.9) ,*** the TS1 tumors(from 13 to 20 mm) showed higher SUVs in FDG-PET with dual time point evaluation in the delayed phase compared with the early phase,which suggested the lesions were malignant. CONCLUSION:These results indicate that FDG-PET with dual time point evaluation is a useful modality for the detection of small pancreatic cancers with a diameter of less than 20 mm.

关键词： Ductal carcinoma Pancreas 18 F-fluorodeoxyglucose Positron emission tomography Pancreatic cancer Dual time point evaluation

Chemotherapy for advanced hepatocellular carcinoma in the sorafenib age

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第15期20卷 4151-4159页

作者： Koji Miyahara Kazuhiro Nouso Kazuhide yamamoto Department of Gastroenterology and Hepatology Okayama University Graduate School of MedicineDentistryand Pharmaceutical SciencesOkayama-cityOkayama 700-8558Japan Department of Molecular Hepatology Okayama University Graduate School of MedicineDentistryand Pharmaceutical SciencesOkayama-cityOkayama 700-8558Japan

The kinase inhibitor sorafenib is the only systemic therapy proven to have a positive effect on survival of patients with advanced hepatocellular carcinoma(HCC).After development of sorafenib and its introduction as a therapeutic agent used in the clinic,several critical questions have been *** parameters and biomarkers predicting sorafenib efficacy are the most important issues that need to be *** it is difficult to know the responders in advance using conventional characteristics of patients,there are specific serum cytokines and/or gene amplification in tumor tissues that have been reported to predict efficacy of *** and benefits of continuation of sorafenib beyond radiological progression is another issue to consider because no other standard therapy for advanced HCC as yet *** addition,effectiveness of the expanded application of sorafenib is still controversial,although a few studies have shed some light on combinational treatment with sorafenib for intermediate-stage ***,over 50 relevant drugs have been developed and are currently under *** efficacy of some of these drugs has been extensively examined,but none have demonstrated any superiority over sorafenib,so ***,there are several drugs that have shown efficacy for treatment after sorafenib failure,and these are proceeding to further *** address these issues and questions,we have done extensive literature review and summarize the most current status of therapeutic application of sorafenib.

关键词： Biomarker Molecular targeted therapy Clinical trial Hepatic arterial infusion chemotherapy Hepatocellular carcinoma Sorafenib

Mission of the National Cancer Center Hospital in Japan to promote clinical trials for precision medicine

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cancer Biology & Medicine 2024年第1期21卷 1-3页

作者： Kazuaki Shimada Kenichi Nakamura Noboru yamamoto Department of Hepatobiliary and Pancreatic Surgery National Cancer Center HospitalTokyo 104-0045Japan Clinical Research Support Offce National Cancer Center HospitalTokyo 104-0045Japan Department of Experimental Therapeutics National Cancer Center HospitalTokyo 104-0045Japan

Precision medicine is a growing field *** its potential benefit to many patients,several major obstacles must be overcome before precision medicine can be more widely used in clinical *** main obstacles are associated... 详细信息

关键词： clinical Cancer overcome

维普期刊数据库

Numerical Investigation of Loss Generation Mechanisms of Flow in Turbomachinery by Using Curved Square Duct

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2003年第3期12卷 219-224页

作者： Hoshio Tsujita Shimpei Mizuki Gaku Minorikawa Atsumasa yamamoto Department of Mechhanical Engineering Hosei University3-7-2 Kajino-choKoganeiTokyoJapanDepartment of Mechhanical EngineeringHosei University3-7-2 Kajino-choKoganeiTokyoJapanDepartment of Mechhanical EngineeringHosei University3-7-2 Kajino-choKoganeiTokyoJapanNational Aerospace Laboratory 7-44-1 Jindaiji-higashi-machi Chofu Tokyo Japan

The secondary flow within a passage of turbomachinery exhibits a complex flow pattern by the effect of the centrifugal and the Coriolis forces. The passage vortex in this secondary flow generates a major part of the losses. However, the mechanism of the loss generation has not been fully clarified yet. In this point of view, the passage vortex is closely examined by the computational method using the two-dimensional curved square ducts as fundamental models. The inlet boundary layer thickness and the inlet velocity distortion are considered to be the major parameters affecting the generation of passage vortex in the present study. The computed results revealed that the passage vortex gave the predominant effects for the generation of loss not only in the breakdown process but also in the development process.

关键词： curved duct turbomachinery secondary flow passage vortex loss generation

维普期刊数据库

Coupling of plasmonic nanopore pairs: facing dipoles attract each other

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2016年第1期5卷 492-498页

作者： Takumi Sannomiya Hikaru Saito Juliane Junesch Naoki yamamoto Department of Innovative and Engineered Materials Tokyo Institute of TechnologyYokohama 226-8503Japan Center of Advanced Instrumental Analysis Kyushu UniversityKasuga 816-8580Japan Department of Physics Chalmers University of TechnologyGothenburg 41296Sweden

Control of the optical properties of nano-plasmonic structures is essential for next-generation optical circuits and high-throughput biosensing *** of such nano-optical devices requires optical couplings of various nanostructured elements and field confinement at the *** particular,symmetric coupling modes,also referred to as dark modes,have recently received considerable attention because these modes can confine light energy to small *** the coupling behavior of plasmonic nanoparticles has been relatively well studied,couplings of inverse structures,that is,holes and pores,remain partially *** for the most fundamental coupling system of two dipolar holes,comparison of the symmetric and antisymmetric coupling modes has not been *** we present,for the first time,a systematic study of the symmetric and anti-symmetric coupling of nanopore pairs using cathodoluminescence by scanning transmission electron microscopy and electromagnetic *** symmetric coupling mode,approximated as a pair of facing dipoles,is observed at a lower energy than that of the anti-symmetric coupling mode,indicating that the facing dipoles attract each *** anti-symmetric coupling mode splits into the inner-and outer-edge localized modes as the coupling distance *** coupling behaviors cannot be fully explained as inverses of coupled *** and anti-symmetric coupling modes are also observed in a short-range ordered pore array,where one pore supports multiple local resonance modes,depending on the distance to the neighboring *** to the observed symmetric modes by far field is also discussed,which is important for nanophotonic device applications.

关键词： cathodoluminescence plasmonic nanopore short-range order surface plasmon transmission electron microscopy

Gene expression analysis in the larval silk gland of the eri silkworm Samia ricini

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2016年第6期23卷 791-804页

作者： Takuya Tsubota Kimiko yamamoto Kazuei Mita Hideki Sezutsu Transgenic Silkworm Research Unit Ibaraki 305-8634Japan Insect Genome Research Unit National Institute of Agrobiological Sciences Ibaraki 305-8634Japan

Insects produce silk for a range of purposes. In the Lepidoptera, silk is utilized as a material for cocoon production and serves to protect larvae from adverse environmental conditions or predators. Species in the Saturniidae family produce an especially wide variety of cocoons, for example, large, golden colored cocoons and those with many small holes. Although gene expression in the silk gland of the domestic silkworm （Bombyx mori L.） has been extensively studied, considerably fewer investigations have focused on members of the saturniid family. Here, we established expression sequence tags from the silk gland of the eri silkworm （Samia ricini）, a saturniid species, and used these to analyze gene expression. Although we identified thefibroin heavy chain gene in the established library, genes for other major silk proteins, such asfibroin light chain andfibrohexamerin, were absent. This finding is consistent with previous reports that these latter proteins are lacking in saturniid silk. Recently, a series offibrohexamerin-like genes were identified in the Bombyx genome. We used this information to conduct a detailed analysis of the library established here. This analysis identified putative homologues of these genes. We also found several genes encoding small silk protein molecules that are also present in the silk of other Lepidoptera. Gene expression patterns were compared between eri and domestic silkworm, and both conserved and nonconserved expression patterns were identified for the tested genes. Such differential gene expression might be one of the major causes of the differences in silk properties between these species. We believe that our study can be of value as a basic catalogue for silk gland gene expression, which will yield to the further understanding of silk evolution.

关键词： domestic silkworm eri silkworm EST analysis Samia ricini silk gland

Carleman Estimates for Parabolic Equations with Nonhomogeneous Boundary Conditions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2009年第4期30卷 333-378页

作者： Oleg Yu IMANUVILOV Jean Pierre PUEL Masahiro yamamoto Department of Mathematics Colorado State University 101 Weber Building Fort Collins CO 80523USA Laboratoire de Mathematiques de Versailles Universit de Versailles-St. Quentin 45 Avenue des Etats Unis 78035 Versailles France. Department of Mathematical Sciences University of Tokyo Komaba Meguro Tokyo 153 Japan.

The authors prove a new Carleman estimate for general linear second order parabolic equation with nonhomogeneous boundary conditions. On the basis of this estimate, improved Carleman estimates for the Stokes system and for a system of parabolic equations with a penalty term are obtained. This system can be viewed as an approximation of the Stokes system.

关键词： Controllability Parabolic equations Carleman estimates

维普期刊数据库

Radiologic-pathologic correlation of three-dimensional shear-wave elastographic findings in assessing the liver ablation volume after radiofrequency ablation

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第33期20卷 11850-11855页

作者： Katsutoshi Sugimoto hisashi Oshiro Saori Ogawa Mitsuyoshi Honjo Takeshi Hara Fuminori Moriyasu Department of Gastroenterology and Hepatology Tokyo Medical University Tokyo 160-0023 Japan Department of Pathology Tokyo Medical University Tokyo 160-0023 Japan Department of Intelligent Image Information Gifu University Graduate School of Medicine Gifu 501-1193 Japan

AIM: To evaluate the usefulness of three-dimensional (3D) shear-wave elastography (SWE) in assessing the liver ablation volume after radiofrequency (RF) ablation.

关键词： Radiofrequency ablation Liver Ultrasound Shear-wave elastography Three-dimensional