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AEGIS: AN ADVANCED LATTICE PHYSICS CODE FOR LIGHTWATER REACTOR ANALYSES
AKIO YAMAMOTO,TOMOHIRO ENDO,MASATO TABUCHI,NAOKI SUGIMURA,TADASHI USHIO,MASAAKI MORI,MASAHIRO TATSUMI,YASUNORI OHOKA 한국원자력학회 2010 Nuclear Engineering and Technology Vol.42 No.5
AEGIS is a lattice physics code incorporating the latest advances in lattice physics computation, innovative calculationmodels and efficient numerical algorithms and is mainly used for light water reactor analyses. Though the primary objectiveof the AEGIS code is the preparation of a cross section set for SCOPE2 that is a three-dimensional pin-by-pin core analysiscode, the AEGIS code can handle not only a fuel assembly but also multi-assemblies and a whole core geometry in two-dimensional geometry. The present paper summarizes the major calculation models and part of the verification/validationefforts related to the AEGIS code.
AEGIS: AN ADVANCED LATTICE PHYSICS CODE FOR LIGHT WATER REACTOR ANALYSES
Yamamoto, Akio,Endo, Tomohiro,Tabuchi, Masato,Sugimura, Naoki,Ushio, Tadashi,Mori, Masaaki,Tatsumi, Masahiro,Ohoka, Yasunori Korean Nuclear Society 2010 Nuclear Engineering and Technology Vol.42 No.5
AEGIS is a lattice physics code incorporating the latest advances in lattice physics computation, innovative calculation models and efficient numerical algorithms and is mainly used for light water reactor analyses. Though the primary objective of the AEGIS code is the preparation of a cross section set for SCOPE2 that is a three-dimensional pin-by-pin core analysis code, the AEGIS code can handle not only a fuel assembly but also multi-assemblies and a whole core geometry in two-dimensional geometry. The present paper summarizes the major calculation models and part of the verification/validation efforts related to the AEGIS code.
Hagihara Shusuke,Ohta Hideki,Tanaka Jun,Shiokawa Teruaki,Kida Yoshikuni,Iguchi Yohei,Tatsumi Masato,Shibata Ryo,Tahara Kenichi,Shibata Tatsuya,Sanada Kyoichi,Ymamoto Takuaki 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.5
Study Design: This study adopted a retrospective cohort study design.Purpose: This study aimed to clarify the influence of diffuse idiopathic skeletal hyperostosis (DISH) on bone fusion after transforaminal lumbar interbody fusion (TLIF).Overview of Literature: The negative effects of DISH on lumbar degenerative diseases have been reported, and DISH may be involved in the onset and severity of lumbar spinal canal stenosis. Patients with DISH have significantly more reoperations after posterior lumbar fusion, including TLIF. However, the effects of DISH on bone fusion after TLIF have not been reported.Methods: The medical records of patients with intervertebral TLIF from 2012 to 2018 were retrospectively examined. The patients were divided into those with fusion and those with pseudoarthrosis, and the following data were compared: age, sex, DISH, diabetes mellitus, smoking, drinking, albumin levels, body mass index ≥30 kg/m<sup>2</sup>, and L5/S fixation. Statistical analyses were performed using regression models.Results: In this study, 180 patients (78.6%) had fusion and 49 patients (21.4%) had pseudoarthrosis. The number of patients with DISH was significantly higher in the pseudoarthrosis group than in the fusion group (36.7% and 21.7%, respectively; univariate <i>p</i>=0.031, multivariate p =0.019). No significant differences in age, sex, diabetes mellitus, smoking, drinking, albumin levels, body mass index ≥30 kg/m<sup>2</sup>, and L5/S fixation were observed between the two groups. The risk factors for bone fusion were statistically analyzed in 57 patients with DISH. DISH with a caudal end below Th11 was an independent risk factor for pseudoarthrosis (univariate <i>p</i>=0.011, multivariate <i>p</i>=0.033).Conclusions: DISH is an independent risk factor for pseudoarthrosis after one intervertebral TLIF, and DISH with a caudal end below Th11 is associated with a higher risk of pseudoarthrosis than DISH without a caudal end below Th11.