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GO CHIBA,MASASHI TSUJI,TADASHINARABAYASHI 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.3
In order to properly quantify fission reactor neutronics parameter uncertainties, we have to use covariance data andsensitivity profiles consistently. In the present paper, we establish two consistent methodologies for uncertainty quantification:a self-shielded cross section-based consistent methodology and an infinitely-diluted cross section-based consistentmethodology. With these methodologies and the covariance data of uranium-238 nuclear data given in JENDL-3.3, wequantify uncertainties of infinite neutron multiplication factors of light water reactor and fast reactor fuel cells. While aninconsistent methodology gives results which depend on the energy group structure of neutron flux and neutron-nuclidereaction cross section representation, both the consistent methodologies give fair results with no such dependences
Chiba, Go,Tsuji, Masashi,Narabayashi, Tadashi Korean Nuclear Society 2014 Nuclear Engineering and Technology Vol.46 No.3
In order to properly quantify fission reactor neutronics parameter uncertainties, we have to use covariance data and sensitivity profiles consistently. In the present paper, we establish two consistent methodologies for uncertainty quantification: a self-shielded cross section-based consistent methodology and an infinitely-diluted cross section-based consistent methodology. With these methodologies and the covariance data of uranium-238 nuclear data given in JENDL-3.3, we quantify uncertainties of infinite neutron multiplication factors of light water reactor and fast reactor fuel cells. While an inconsistent methodology gives results which depend on the energy group structure of neutron flux and neutron-nuclide reaction cross section representation, both the consistent methodologies give fair results with no such dependences.
Original Article : Ulcerative Colitis and Immunoglobulin G4
( Go Kuwata ),( Terumi Kamisawa ),( Koichi Koizumi ),( Taku Tabata ),( Seiichi Hara ),( Sawako Kuruma ),( Takashi Fujiwara ),( Kazuro Chiba ),( Hideto Egashira ),( Junko Fujiwara ),( Takeo Arakawa ),( The Editorial Office of Gut and Liver 2014 Gut and Liver Vol.8 No.1
Background/Aims: Ulcerative colitis (UC) is sometimes associated with autoimmune pancreatitis (AIP). Infiltration of immunoglobulin G4 (IgG4)-positive plasma cells is sometimes detected in the colonic mucosa of AIP or UC patients. This study aimed to clarify the relation between UC and IgG4. Methods: Associations with UC were reviewed in 85 AIP patients. IgG4 immunostaining was performed on biopsy specimens from the colonic mucosa of 14 AIP and 32 UC patients. Results: UC was confirmed in two cases (type 1 AIP, n=1, suspected type 2 AIP, n=1). Abundant infiltration of IgG4-positive plasma cells in the colonic mucosa was detected in the case of suspected type 2 AIP with UC and two cases of type 1 AIP without colitis. Abundant infiltration of IgG4-positive plasma cells was detected in 10 UC cases (IgG4-present, 31%). Although 72% of IgG4-absent UC patients showed mild disease activity, 70% of IgG4-present patients showed moderate to severe disease activity (p<0.05). Conclusions: UC is sometimes associated with AIP, but it seems that UC is not a manifestation of IgG4-related disease. Infiltration of IgG4-positive plasma cells is sometimes detectable in the colonic mucosa of UC patients and is associated with disease activity. (Gut Liver 2014,8:29-34)
Correlation between Charge Asphericity and Dzyaloshinskii-Moriya Interaction
Sanghoon Kim,Kohei Ueda,Gyungchoon Go,Peong-Hwa Jang,Kyung-Jin Lee,Abderrezak Belabbes,Aurelien Manchon,Motohiro Suzuki,Yoshinori Kotani,Tetsuya Nakamura,Kohji Nakamura,Tomohiro Koyama,Daichi Chiba,Ki 한국자기학회 2018 한국자기학회 학술연구발표회 논문개요집 Vol.2018 No.3
JENDL-4.0 Integral Testing for Fission Systems
R. D. McKnight,Kazuteru Sugino,Go Chiba,Yasunobu Nagaya,Kenji Yokoyama,Teruhiko Kugo,Makoto Ishikawa,Shigeaki Okajima 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Benchmark testing for the newly developed Japanese evaluated nuclear data library JENDL-4.0 is carried out by using a huge amount of the integral data. Benchmark calculations are performed with the continuous-energy Monte Carlo code with a large number of neutron histories or with the deterministic procedure which has been developed for fast reactor analyses in Japan. In the present paper, representative benchmark results are shown as a rapid report. They are the results for criticality of low enriched UO_2 or MOX fueled light water moderated systems, of uranium or plutonium fuelled solution systems, of various fast reactors, and results of PIE analyses for a PWR spent fuel and actinoide samples irradiated in fast reactors.
Characteristic Findings of Endoscopic Retrograde Cholangiopancreatography in Autoimmune Pancreatitis
( Susumu Iwasaki ),( Terumi Kamisawa ),( Satomi Koizumi ),( Kazuro Chiba ),( Taku Tabata ),( Sawako Kuruma ),( Go Kuwata ),( Takashi Fujiwara ),( Koichi Koizumi ),( Takeo Arakawa ),( Kumiko Momma ),( 대한소화기학회 2015 Gut and Liver Vol.9 No.1
Background/Aims: Diffuse or segmental irregular narrowing of the main pancreatic duct (MPD), as observed by endoscopic retrograde cholangiopancreatography (ERCP), is a characteristic feature of autoimmune pancreatitis (AIP). Methods: ERCP findings were retrospectively examined in 40 patients with AIP in whom irregular narrowing of the MPD was detected near the orifice. The MPD opening sign was defined as the MPD within 1.5 cm from the orifice being maintained. The distal common bile duct (CBD) sign was defined as the distal CBD within 1.5 cm from the orifice being maintained. Endoscopic findings of a swollen major papilla and histological findings of specimens obtained from the major papilla were examined in 26 and 21 patients, respectively. Results: The MPD opening sign was detected in 26 of the 40 patients (65%). The distal CBD sign was detected in 25 of the 32 patients (78%), which showed stenosis of the lower bile duct. The patients who showed the MPD opening sign frequently showed the distal CBD sign (p=0.018). Lymphoplasmacytic infiltration, but not dense fibrosis, was histologically detected in biopsy specimens obtained from the major papilla. Conclusions: On ERCP, the MPD and CBD adjacent to the major papilla are frequently maintained in patients with AIP involving the pancreatic head. These signs are useful for diagnosing AIP on ERCP. (Gut Liver 2015;9:113-117)
( Yuji Miyamoto ),( Terumi Kamisawa ),( Taku Tabata ),( Seiichi Hara ),( Sawako Kuruma ),( Kazuro Chiba ),( Yoshihiko Inaba ),( Go Kuwata ),( Takashi Fujiwara ),( Hideto Egashira ),( Koichi Koizumi ) The Editorial Office of Gut and Liver 2012 Gut and Liver Vol.6 No.4
Background/Aims: Autoimmune pancreatitis (AIP) is frequently associated with diabetes mellitus (DM). This study evaluated the effect of steroid therapy on the course of DM in AIP. Methods: Glucose tolerance was examined in 69 patients with AIP. DM onset was classified as either a simultaneous onset with AIP or an exacerbation of pre-existing DM. Based on the changes in the HbA1c levels and insulin dose, the responses of DM to steroids were classified as improved, no change, or worsened. Results: Thirty (46%) patients were diagnosed as having DM (simultaneous onset, n=17; pre-existing, n=13). Three months after starting the steroid treatment, the DM improved in 13 (54%) of 24 DM patients. The DM improved in 55%, had no change in 36%, and worsened in 9% of the 11 simultaneous onset DM patients, and it improved in 54%, had no change in 31%, and worsened in 15% of the 13 pre-existing DM patients. At approximately 3 years after starting the steroid treatment, the DM improved in 10 (63%) of 16 patients. The pancreatic exocrine function improved in parallel with the changes in the DM in seven patients. Conclusions: Because approximately 60% of DM associated with AIP is responsive to steroids in the short- and long-terms, marked DM associated with AIP appears to be an indication for steroid therapy. (Gut Liver 2012;6:501-504)
( Taku Tabata ),( Terumi Kamisawa ),( Seiichi Hara ),( Sawako Kuruma ),( Kazuro Chiba ),( Go Kuwata ),( Takashi Fujiwara ),( Hideto Egashira ),( Koichi Koizumi ),( Junko Fujiwara ),( Takeo Arakawa ),( 대한간학회 2013 Gut and Liver Vol.7 No.2
Background/Aims: Few studies have differentiated immunoglobulin G (IgG) 4-related sclerosing cholangitis (IgG4-SC) from hilar cholangiocarcinoma (CC). Thus, we sought to investigate useful features for differentiating IgG4-SC from hilar CC. Methods: We retrospectively compared clinical, serological, imaging, and histological features of six patients with IgG4-SC and 42 patients with hilar CC. Results: In patients with hilar CC, obstructive jaundice was more frequent (p<0.01), serum total bilirubin levels were significantly higher (p<0.05), serum CA19-9 levels were significantly higher (p<0.01), and serum duke pancreatic monoclonal antigen type 2 levels were frequently elevated (p<0.05). However, in patients with IgG4-SC, the serum IgG (p<0.05) and IgG4 (p<0.01) levels were significantly higher and frequently elevated. The pancreas was enlarged in all IgG4-SC patients but only in 17% of hilar CC patients (p<0.01). Salivary and/or lacrimal gland swelling was detected in only 50% of IgG4-SC patients (p<0.01). Endoscopic retrograde cholangiography revealed that the hilar or hepatic duct was completely obstructed in 83% of hilar CC patients (p<0.01). Lower bile duct stenosis, apart from hilar bile duct stenosis, was more frequent in IgG4-SC patients (p<0.01). Bile duct wall thickening in areas without stenosis was more frequent in IgG4-SC patients (p<0.01). Conclusions: An integrated diagnostic approach based on clinical, serological, imaging, and histological findings is necessary to differentiate IgG4-SC from hilar CC. (Gut Liver 2013;7:234-238)
Organ Correlation in IgG4-Related Diseases
Satomi Koizumi,Terumi Kamisawa,Sawako Kuruma,Taku Tabata,Kazuro Chiba,Susumu Iwasaki,Go Kuwata,Takashi Fujiwara,Junko Fujiwara,Takeo Arakawa,Koichi Koizumi,Kumiko Momma 대한의학회 2015 Journal of Korean medical science Vol.30 No.6
IgG4-related disease (IgG4-RD) is a potentially multiorgan disorder. In this study, clinical and serological features from 132 IgG4-RD patients were compared about organ correlations. Underlying pathologies comprised autoimmune pancreatitis (AIP) in 85 cases, IgG4-related sclerosing cholangitis (IgG4-SC) in 12, IgG4-related sialadenitis (IgG4-SIA) in 56, IgG4-related dacryoadenitis (IgG4-DAC) in 38, IgG4-related lymphadenopathy (IgG4- LYM) in 20, IgG4-related retroperitoneal fibrosis (IgG4-RF) in 19, IgG4-related kidney disease (IgG4-KD) in 6, IgG4-related pseudotumor (IgG4-PT) in 3. Sixty-five patients (49%) had multiple IgG4-RD (two affected organs in 36 patients, three in 19, four in 8, five in 1, and six in 1). Serum IgG4 levels were significantly higher with multiple lesions than with a single lesion (P < 0.001). The proportion of association with other IgG4-RD was 42% in AIP, the lowest of all IgG4-RDs. Serum IgG4 level was lower in AIP than in other IgG4-RDs. Frequently associated IgG4-RDs were SIA (25%) and DAC (12%) for AIP; AIP (75%) for IgG4-SC; DAC (57%), AIP (38%) and LYM (27%) for IgG4-SIA; AIP (26%) and LYM (26%) for IgG4-DAC; SIA (75%), DAC (50%) and AIP (45%) for IgG4-LYM; SIA (58%), AIP (42%) and LYM (32%) for IgG4-RF; AIP (100%) and SIA (67%) for IgG4-KID; and DAC (67%) and SIA (67%) for IgG4-PT. Most associated IgG4-RD lesions were diagnosed simultaneously, but IgG4-SIA and IgG4-DAC were sometimes identified before other lesions. About half of IgG4-RD patients had multiple IgG4-RD lesions, and some associations were seen between specific organs.
Benchmarks of subcriticality in accelerator-driven system at Kyoto University Critical Assembly
Cheol Ho Pyeon,Masao Yamanaka,김송현,Thanh-Mai Vu,TOMOHIRO ENDO,Willem Fredrik G. Van Rooijen,GO CHIBA 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.6
Basic research on the accelerator-driven system is conducted by combining 235U-fueled and 232Th-loaded cores in the Kyoto University Critical Assembly with the pulsed neutron generator (14 MeV neutrons) and the proton beam accelerator (100 MeV protons with a heavy metal target). The results of experimental subcriticality are presented with a wide range of subcriticality level between near critical and 10,000 pcm, as obtained by the pulsed neutron source method, the Feynman-α method, and the neutron source multiplication method.