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Nonlinear collision analysis of heavy trucks onto steel highway guard fences
Itoh, Yoshito,Liu, Chunlu,Usami, Koichi Techno-Press 2001 Structural Engineering and Mechanics, An Int'l Jou Vol.12 No.5
The design specifications of guard fences in Japan were reexamined and the revised specifications were implemented from April 1999. Because of the huge consumption in time and cost to test the performances of full-scale guard fences in the field, some assumptions are adopted while modifying the design specifications, and numerical analyses are necessary to confirm the impact performance and safety level of new types of steel highway guard fences. In this study, the finite element models are developed for the heavy trucks and steel highway guard fences to reenact their behaviors, and the solution approach is carried out using nonlinear dynamic analysis software of structures in three dimensions (LS-DYNA). The numerical simulation results are compared with the full-scale on-site testing results to verify the proposed analysis procedure. The collision process is simulated and it is also made possible to visualize the movement of the truck and the performances of guard fences. In addition, the energy shift of the truck kinetic energy to the truck and guard fence Internal energy, and the energy absorption of each guard fence component are studied for the development of a new design methodology of steel highway guard fences based on the energy absorption capacity.
Akihide Itoh,Yoshito Oshiro,Sotaro Azechi,Yuka Somada,Daishi Handa,Yoichi Miyagi,Kazuhiko Nakano,Akira Tanahara,Takemitsu Arakaki 한국대기환경학회 2018 Asian Journal of Atmospheric Environment (AJAE) Vol.12 No.4
In the present study, total suspended particle (TSP) aerosols were simultaneously collected using identical high-volume air samplers at three islands in Okinawa; Cape Hedo Atmosphere and Aerosol Monitoring Station (CHAAMS, Okinawa Island), from 2008 to 2012 Kume Island (KM, ca. 160 km south-west of CHAAMS), and Minami-Daitou Island (MD, ca. 320 km south-east of CHAAMS) from 2008 to 2010. The sample collected were analyzed using energy-dispersive X-ray fluorescence spectrometry (ED-XRF) and synchrotron radiation X-ray fluorescence spectrometry (SR-XRF) to investigation longrange transport of metal elements to Okinawa from the Asian continent. From analytical data on samples collected at CHAAMS for five years, it was found that most elements (Ca, Fe, Ti, Mn, V, Cu, Ni, Pb, As, and Zn) in TSP aerosols showed higher concentrations in the period from October to May, when the continental air mass passed over Okinawa, regardless of Asian dust events. The annual average concentrations of Ni, Cu, Zn, As, Se, and Pb in TSP aerosol samples collected at three islands gradually decreased as the TSP aerosols traveled from west to east in any year. Based on the enrichment factors (EFs) and concentration ratios, it is considered that most of anthropogenic elements such as As, Pb, and Zn in TSP aerosols are derived from coal combustion in the Asian continent. Moreover, it is confirmed from the direction of the air mass reaching the sampling sites that Cu, Zn, As, and Pb in TSP aerosols were transported to the three islands in Okinawa by air mass not only from northwest and north, but also from the west. These TSP aerosols transported from the Asian continent may influences not only the atmospheric environment but also the concentrations of trace metals in coastal seawater in Okinawa, which have to be kept extremely low to preserve the diverse and unique ecosystem in coral reefs.
Hirohata Mikihito,Itoh Yoshito 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.1
In order to propose a simplified simulation method using finite element (FE) model for predicting deformation and residual stress generated by multi-pass butt welding, a series of experiments and numerical analyses were carried out. 3-pass butt welding of steel plates was simulated by the thermal elasto-plastic analysis with shell elements and with solid elements respectively. A heat input model for considering the temperature distribution in the thickness direction in shell elements was proposed. The validity of the heat input model was verified by comparing analytical results with experimental results or other analytical results using solid elements. Furthermore, the effectiveness for saving computing time by using shell elements was confirmed from the comparison with the case using solid elements. It was confirmed that the welding out-of-plane deformation and residual stress could be predicted with high accuracy by the proposed method. The computing time was around 14% of that by the precise model with solid elements.
김인태(Kim In-Tae),伊藤義人(Itoh Yoshito),정진환(Cheung Jin-Hwan) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
This study performed accelerated cyclic corrosion tests on uncoated structural steels. Under S6-cycle corrosion test condition specified in Japanese Industrial Standards (JIS) K5621, weight and thickness losses of the uncoated steels for 30, 60, 90, 120 and 150 days was evaluated. Comparing the weight loss of the uncoated steels with 1-, 3-, 5- and 9-year field exposure test data at 31 sites in Japan, correlation of the S6-cycle tests to the field exposure tests was determined by acceleration coefficients, which can calculated by the amounts of flying salt at the exposure test sites.
( Chung-feng Huang ),( Yasuhiro Asahina ),( Chun-jen Liu ),( Edward Gane ),( Yoshito Itoh ),( Norifumi Kawada ),( Yoshiyuki Ueno ),( Jin Youn ),( Chen-yu Wang ),( Joe Llewellyn ),( Anu Osinusi ),( Jen 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: HCV genotype (GT) 2 is the second most common genotype in several Asian countries including Taiwan and Korea. Treatment options for GT2 remain limited in these countries. The once-daily fixed-dose combination of ledipasvir/sofosbuvir (LDV/SOF) was evaluated for the treatment of GT 2, in patients with or without compensated cirrhosis, in three phase 2 and 3 studies. Methods: This was a retrospective analysis of subjects treated with LDV/SOF for 12 weeks in the GS-US-337-1655 (Taiwan), GS-US-337-1903 (Japan) and GS-US-1468 (New Zealand) studies. Subjects analyzed in this integrated analysis were either mono-infected with HCV GT2, or co-infected with HCV GT2 and HBV. The data was pooled and safety and efficacy were analyzed. Results: Overall 200 subjects were treated and analyzed; 88% of subjects were Asian, 46% male, 31% had prior treatment failure, 15% were cirrhotic, 25% were IL28B non-CC, 34% were 65 years or older and 22% (n=43) were co-infected with HBV. The overall SVR rate was 97% (194/200), and was 93% (27/29) among patients with cirrhosis and 97% (59/61) in patients who had failed previous therapy. Of the 197 patients with available testing; NS5A resistance-associated substitutions (RASs) were present in 86% (169/197) at baseline. SVR12 rate was 98% (165/169) in patients with baseline NS5A RASs compared with 100% (28/28) in patients without NS5A RASs. No new RASs emerged in patients with virologic failure. Treatment with LDV/SOF for 12 weeks was well tolerated. Overall the most common adverse events AEs were headache and nasopharyngitis. Few subjects experienced serious AEs, none of which were assessed as treatment related. One patient discontinued treatment due to AE. Conclusions: Treatment with LDV/SOF for 12 weeks is highly effective and well tolerated in patients with GT2 HCV infection, including patients who are treatment experienced and/or have compensated cirrhosis, baseline NS5A RASs and with HBV/HCV coinfection.
( Sun-young Lee ),( Naohisa Yoshida ),( Osamu Dohi ),( Sang Pyo Lee ),( Daisuke Ichikawa ),( Jeong Hwan Kim ),( In-kyung Sung ),( Hyung Seok Park ),( Eigo Otsuji ),( Yoshito Itoh ),( Chan Sup Shim ),( 대한간학회 2017 Gut and Liver Vol.11 No.3
Background/Aims: The presence of invasion is a diagnostic criterion of early gastric cancer (EGC) in Korea, whereas diagnosis in Japan is based on enlarged nuclei and prominent nucleoli. Moreover, the depth of invasion is the location of cancer cell infiltration in Korea, whereas it is the location of lymphovascular invasion (LVI) or cancer cell infiltration in Japan. We evaluated the characteristics of EGC with LVI to uncover the effects of different diagnostic criteria. Methods: Consecutive T1-stage EGC patients who underwent complete resection were included after endoscopic or surgical resection. The presence of LVI was evaluated. Results: LVI was present in 112 of 1,089 T1-stage EGC patients. LVI was associated with depth of invasion (p<0.001) and age (p=0.017). The prevalence of LVI in mucosal cancer was significantly higher in Korea (p<0.001), whereas that of submucosal cancer was higher in Japan (p=0.024). For mucosal EGC types, LVI was positively correlated with diagnostic criteria applied in Korea (p=0.017). For submucosal EGC types, LVI was positively correlated with Japanese criteria (p=0.001) and old age (p=0.045). Conclusions: The higher prevalence of LVI for mucosal EGC in Korea and for submucosal EGC in Japan indicates that different diagnostic criteria should be considered when reading publications from other countries. (Gut Liver 2017;11:383-391)
Naohisa Yoshida,Osamu Dohi,Ken Inoue,Ritsu Yasuda,Takaaki Murakami,Ryohei Hirose,Ken Inoue,Yuji Naito,Yutaka Inada,Kiyoshi Ogiso,Yukiko Morinaga,Mitsuo Kishimoto,Rafiz Abdul Rani,Yoshito Itoh 거트앤리버 소화기연관학회협의회 2019 Gut and Liver Vol.13 No.2
A laser endoscopy system was developed in 2012. The system allows blue laser imaging (BLI), BLI-bright, and linked color imaging (LCI) to be performed as modes of narrowband light observation; these modes have been reported to be useful for tumor detection and characterization. Furthermore, an innovative endoscopy system using four-light emitting diode (LED) multilight technology was released in 2016 to 2017 in some areas in which laser endoscopes have not been approved for use, including the United States and Europe. This system enables blue light imaging (this is also known as BLI) and LCI with an LED light source instead of a laser light source. Several reports have shown that these modes have improved tumor detection. In this paper, we review the efficacy of BLI and LCI with laser and LED endoscopes in tumor detection and characterization.