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Naoyuki Takashima,Hisatomi Arima,Yoshikuni Kita,Takako Fujii,Sachiko Tanaka-Mizuno,Satoshi Shitara,Akihiro Kitamura,Yoshihisa Sugimoto,Makoto Urushitani,Katsuyuki Miura,Kazuhiko Nozaki 대한뇌졸중학회 2020 Journal of stroke Vol.22 No.3
Background and Purpose Although numerous measures for stroke exist, stroke remains one of the leading causes of death in Japan. In this study, we aimed to determine the long-term survival rate after first-ever stroke using data from a large-scale population-based stroke registry study in Japan. Methods Part of the Shiga Stroke and Heart Attack Registry, the Shiga Stroke Registry is an ongoing population-based registry study of stroke, which covers approximately 1.4 million residents of Shiga Prefecture in Japan. A total 1,880 patients with non-fatal first-ever stroke (among 29-day survivors after stroke onset) registered in 2011 were followed up until December 2016. Five-year cumulative survival rates were estimated using the Kaplan-Meier method, according to subtype of the index stroke. Cox proportional hazards models were used to assess predictors of subsequent allcause death. Results During an average 4.3-year follow-up period, 677 patients died. The 5-year cumulative survival rate after non-fatal first-ever stroke was 65.9%. Heterogeneity was present in 5-year cumulative survival according to stroke subtype: lacunar infarction, 75.1%; large-artery infarction, 61.5%; cardioembolic infarction, 44.9%; intracerebral hemorrhage, 69.1%; and subarachnoid hemorrhage, 77.9%. Age, male sex, Japan Coma Scale score on admission, and modified Rankin Scale score before stroke onset were associated with increased mortality during the chronic phase of ischemic and hemorrhagic stroke. Conclusions In this study conducted in a real-world setting of Japan, the 5-year survival rate after non-fatal first-ever stroke remained low, particularly among patients with cardioembolic infarction and large-artery infarction in the present population-based stroke registry.
Naoyuki Tatsumi,Yoshihito Maeda,Hiroshi Nozawa,Shin-ichi Tamai 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
We have investigated the structural changes of SrBi2Ta2O9 (SBT) and Bi3:75La0:25Ti3O12 (BLT)lms under a high temperature annealing process at 800 C in a vacuum (pressure = 103 Pa),which is an extreme annealing condition. An improvement in the crystalline orientation due to the coalescence of crystalline grains was conrmed. Raman studies revealed that the deciency of Bi3in the Bi oxide layer of SBT was caused by the annealing and occurred to a greater extent than inBLT. This dierence between SBT and BLT is discussed on the basis of the dierence in stabilitybetween (TaO6) and (TiO6) octahedrons.
Naoyuki Asao,Katashi Fujii 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.10
In Japan, many steel railway bridges were constructed during the period of rapid economic growth in the 1960s. Now, as over 50 years have passed, the condition of these aging structures has become conspicuous, and a major social problem. In particular, the deterioration and damage due to corrosion in steel plate girder railway bridges with open deck system is becoming pronounced. Nevertheless, the remaining strength evaluation and the methods of reinforcing corroded structures are not always sufficient. Therefore, the purpose of this study is to propose an analytically-based evaluation method, and a reliable measure of reinforcement in the field of steel railway bridge maintenance. The following is noted: 1) Regarding the shear capacity of plate girders with corrosion near supports, the remaining strength depends on the condition of the corroded surface of each component of the member, such as a web or a vertical stiffener. Also, according to the form and degree of corrosion, the fracture mode also changes from the buckling of web to the buckling of cross-shape columns which consisting of the web and vertical stiffener. The result shows that the corroded web has more effect on the shear capacity than the vertical stiffener. 2) Regarding situation of separation between the web and bottom flange due to corrosion near supports, the remaining strength is found to deteriorate more rapidly than in the Case 1 above when the separation area lengthens to more than that of the sole plate area. 3) To enhance the remaining shear capacity in the Cases 1 and 2 above, the load bearing capacity can be improved dramatically by unsophisticated attachments applied as reinforced members.
A Novel Spiral-Type Motion Estimation Architecture for H.264/AVC
Naoyuki Hirai,Tian Song,Yizhong Liu,Takashi Shimamoto 대한전자공학회 2010 Journal of semiconductor technology and science Vol.10 No.1
New features of motion compensation, such as variable block size and multiple reference frames are introduced in H.264/AVC. However, these new features induce significant implementation complexity increases. In this paper, an efficient architecture for spiral-type motion estimation is proposed. First, we propose a hardware-friendly spiral search order. Then, an efficient processing element (PE) architecture for ME is proposed to achieve the proposed search order. The improved PE enables one-pixel-move of the reference pixel data to top, bottom, right, and left by four ports for input and output. Moreover, the parallel calculation architecture to calculate all block size with the SAD of 4x4 is introduced in the proposed architecture. As the result of hardware implementation, the hardware cost is about 145k gates. Maximum clock frequency is 134 ㎒ in the case of FPGA (Xilinx Vertex5) implementation.
일본 고등학교 영어 교과서와 온라인 경제학 교육 콘텐츠의 어휘 비교
( Naoyuki Kuida ) 한국경제교육학회 2018 경제교육연구 Vol.25 No.2
본 논문의 목적은 일본 고등학교 영어 교과서 ‘커뮤니케이션 영어 Ⅰ, Ⅱ, Ⅲ (총 93권)’의 어휘와 온라인 경제학 교육 콘텐츠 ‘CORE-Econ(Beta-version)’의 어휘를 비교함으로써 교과서 어휘 활용을 통한 어휘 부담의 경감과 함께 영어로 경제학의 학습이 가능함을 밝히는 데에 있다. 그 결과, ‘CORE-Econ’에서 사용된 어휘의 약 70%가 교과서 어휘로 되어 있었다. 또, 본 연구에서 독자적으로 개발한 기수(旣習) 어휘 지수(Already-learned-vocabulary index, ALV index)가 포함된 어휘표를 활용함으로써 영어 전공이 아닌 교사도 학생들의 어휘력 측정이 가능하고 내용지도와 어휘지도의 병행이 가능하다는 것이 시사되었다. The purpose of this paper is to compare the vocabulary used in high school English textbooks “English Communication I, II and III” in Japan with the vocabulary of online English Economics education “CORE-Econ” and to demonstrate that the English textbooks vocabulary is helpful for students to study Economics in English. Vocabulary comparison made in this paper showed about 70 percent of the words in CORE E-con were used in the English communication textbooks. In addition, the vocabulary lists with an original index called “already-learned vocabulary” index (ALV index) help teachers understand students’ vocabulary and enable them to teach Economics and English vocabulary to students easily.