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Design of launch pad for mitigating acoustic loads on launch vehicle at liftoff
Tsutsumi, Seiji The Acoustical Society of Korea 2020 韓國音響學會誌 Vol.39 No.4
우주발사체는 발사 시 추진장치에서 발생하는 고강도 소음에 의한 음향하중의 영향을 받는다. 로켓소음은 발사체와 페이로드 내 전자 및 기계 부품의 손상 및 오작동을 유발할 수 있기 때문에 음향하중의 예측 및 저감은 설계에 있어 중요한 고려사항이다. 본 논문에서는 로켓 소음의 생성 및 발사대의 음향설계 기법에 대한 최신 연구동향을 논하였다. 특히, 새로운 발사대 설계 방법론의 예로서 일본 Epsilon 로켓 발사대의 개발과정을 기술하였다. 전산유체역학 모사 및 1/42 축소모형 실험을 통하여 설계된 발사대의 음향하중 저감 효과를 Epsilon 로켓의 실제 비행 데이터 분석을 통하여 검증하였다.
Hepcidin Levels and Pathological Characteristics in Children with Fatty Liver Disease
Tsutsumi, Norito,Nishimata, Shigeo,Shimura, Masaru,Kashiwagi, Yasuyo,Kawashima, Hisashi The Korean Society of Pediatric Gastroenterology 2021 Pediatric gastroenterology, hepatology & nutrition Vol.24 No.3
Purpose: Hepcidin levels have previously been reported to be correlated with liver damage. However, the association between hepcidin levels and liver fibrosis in children with fatty liver disease remains unclear. This study therefore aimed to investigate the pathophysiology of fibrosis in children with fatty liver disease and its association with hepcidin levels. Methods: This retrospective case series included 12 boys aged 6-17 years who were diagnosed with nonalcoholic fatty liver disease (NAFLD) or nonalcoholic steatohepatitis (NASH) at the Tokyo Medical University Hospital. Sixteen liver biopsy samples from 12 subjects were analyzed. Serum hepcidin levels were assayed using enzyme-linked immunosorbent assay. Immunostaining for hepcidin was performed, and the samples were stratified by staining intensity. Results: Serum hepcidin levels were higher in pediatric NAFLD/NASH patients than in controls. Conversely, a significant inverse correlation was observed between hepcidin immunostaining and Brunt grade scores and between hepcidin scores and gamma-glutamyltranspeptidase, hyaluronic acid, and leukocyte levels. We observed inverse correlations with a high correlation coefficient of >0.4 between hepcidin immunostaining and aspartate aminotransferase, alanine aminotransferase, total bile acid, and platelet count. Conclusion: There was a significant inverse correlation between hepcidin immunoreactivity and fibrosis in pediatric NAFLD patients; however, serum hepcidin levels were significantly higher, suggesting that these patients experienced a reduction in the hepcidin-producing ability of the liver in response to iron levels, leading to subsequent fibrosis. Therefore, hepcidin levels can be used as markers to identify the progression of fibrosis in patients with NAFLD.
Analysis of orthotropic circular disks and rings under diametrical loadings
Tsutsumi, Takashi,Hirashima, Ken-Ichi Techno-Press 2000 Structural Engineering and Mechanics, An Int'l Jou Vol.9 No.1
Very few studies on orthotropic circular disks or rings under diametrical loadings are conducted because of difficulties in treatment. This paper shows analytical solutions and gives the distributions of stresses and displacements by using Lekhnitskii's complex variable method. Several numerical results are shown by graphical representation.
Tsutsumi, Atsushi,Chen, Wei,Kim, Yong Han 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.6
According to axial profile of solid concentration, the cocurrent upward three-phase reactors with liquid as continuous phase can be classified into three types: (a) gas-sparged slurry reactors, (b) three-phase bubble columns, and (c) three-phase fluidized beds. Comparative study shows that the gas hold up, bubble characteristics and mass transfer are significantly dependent on the type of three-phase reactors. Three types of reactors exhibit the different hydrodynamic and transport behaviors with particle size, solid concentration and gas holdup. The structural analysis of the axial solid distribution indicates the bubble and bubble wake dynamics are the key factors to the hydrodynamic and transport behaviors of three-phase reactors.
Tsutsumi, Takashi,Iwashita, Hiroshi,Miyahara, Kagenobu Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.38 No.3
This paper shows the solution for an orthotropic disk under the plane strain condition obtained with complex stress functions. These stress functions were induced by Lekhnitskii and expanded by one of the authors. Regarding diametrical compression test, the finite element method poses difficulties in representing the concentrated force because the specimens must be divided into finite elements during calculation. On the other hand, the method shown in this study can exactly represent this force. Some numerical results are shown and compared with those obtained under the plane stress condition for both stress and displacement. This comparison shows that the differences between the tensile stresses occurred under the plane strain condition and also that the differences under a plane stress condition increase as the orthotropy ratio increases for some cases.
( Koichiro Tsutsumi ),( Hironari Kato ),( Hiroyuki Okada ) 대한소화기학회 2017 Gut and Liver Vol.11 No.2
A newly developed short double-balloon enteroscope with a working channel enlarged to a diameter of 3.2 mm is a novel innovation in stent placement for patients with surgi-cally altered anatomies. Herein, we report three patients in whom this new scope contributed to an efficient technique and ideal treatment. In the first case, the double guidewire technique was efficient and effective for multiple stent place-ments. In the second case, covered self-expandable metal stent (SEMS) placement, which is the standard treatment for malignant biliary obstruction, could be performed in a technologically sound and safe manner. In the third case, SEMS placement was performed as palliative treatment for malignant afferent-loop obstruction; this procedure could be performed soundly and safely using the through-the-scope technique. The wider working channel of this new scope also facilitates a smoother accessory insertion and high suction performance, which reduces procedure time and stress on endoscopists. Furthermore, this new scope, which has advanced force transmission, adaptive bending, and a smaller turning radius, is expected to be highly successful in both diagnosis and therapy for various digestive diseases in patients with surgically altered anatomies. (Gut Liver 2017;11:306-311)
( Takeya Tsutsumi ),( Craig Brooks-rooney ),( Bryony Langford ),( Hiroshi Yotsuyanagi ),( Sooji Lee ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: Japanese patients with CHC are elderly and may possess more comorbidities and higher pill burden. This study describes the pill burden and comorbidities in Japanese CHC patients in the Medical Data Vision (MDV) claims database. Methods: This was a retrospective cohort study of ≥18 years old patients with CHC (ICD-10: B18.2) from 2008-2016. Age and gender were derived from the database for the most recent CHC visit. Comorbidity prevalence was assessed using ICD-10 codes. Patients who had received all oral direct acting antiviral (DAA) therapy were identified through receipt code for a prescription for a DAA. The average number of tablets (‘pill burden’) taken by DAA-treated patients was calculated for the 90 days prior/post first prescription date of a DAA. Results: The study population included 173,796 patients (mean ±SD age 69±14, 51.7% male), with a large proportion ≥75 years old (40.7%). Prevalent comorbidities included hypertension (41.4%) and type 2 diabetes (18.3%). Patients within the sample experienced a mean of 3.54±2.98 comorbidities, with elderly HCV patients experiencing more comorbidities than younger HCV patients (age group 18-34 vs. 75+; 1.17±1.64 vs. 4.33±3.09; P< 0.001). The 10 most prevalent comorbidities are displayed in Table 1, with most increasing with age. 19,683 patients satisfied criteria for pill burden analysis. Pre- and post- DAA treatment initiation mean pill burden was 4.23±11.4 pills/ day and 6.72±12.17 pills/day, respectively. Pill burden was higher among older patients, with those aged over 75 experiencing mean pill counts of 5.2±13.27 and 7.12±12.05 pre- and post-index, respectively. A greater proportion of elderly patients had a pill burden of >10 after initiating DAA treatment, compared to those in younger age groups (age group 18-34 vs. 75+; 4.2% vs. 21.6%; P<0.001). Conclusions: The majority of Japanese CHC patients are elderly with several comorbidities and high pill burden pre-DAA treatment, which may be an important consideration for CHC regimen selection.
Preliminary Analysis of Interconnect Full Open Faults using TEG chips
Toshiyuki Tsutsumi,Yasuyuki Kariya,Masaki Hashizume,Hiroyuki Yotsuyanagi,Koji Yamazaki,Yoshinobu Higami,Hiroshi Takahashi,Yuzo Takamatsu 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
As LSIs are scale-down, there is an increasing need to take measures against open faults. However, no practical model for open faults exists at present. Therefore, we fabricated Test Element Group (TEG) chips that intentionally incorporated full (complete) open defects and electrically measured the output signals relevant to its defective lines in order to create a new model for open fault behavior. This study reveals the effect boundary of adjacent signal lines on the line containing the full open defect for the first time using the TEG chips.