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Hong JeongHa's Tianyuanshu and Zhengcheng Kaifangfa
홍성사,홍영희,김영욱,Hong, Sung Sa,Hong, Young Hee,Kim, Young Wook The Korean Society for History of Mathematics 2014 Journal for history of mathematics Vol.27 No.3
Tianyuanshu and Zengcheng Kaifangfa introduced in the Song-Yuan dynasties and their contribution to the theory of equations are one of the most important achievements in the history of Chinese mathematics. Furthermore, they became the most fundamental subject in the history of East Asian mathematics as well. The operations, or the mathematical structure of polynomials have been overlooked by traditional mathematics books. Investigation of GuIlJib (九一集) of Joseon mathematician Hong JeongHa reveals that Hong's approach to polynomials is highly structural. For the expansion of $\prod_{k=11}^{n}(x+a_k)$, Hong invented a new method which we name Hong JeongHa's synthetic expansion. Using this, he reveals that the processes in Zhengcheng Kaifangfa is not synthetic division but synthetic expansion.
Fatigue Assessment of Steel Railway Bridge by Service Loading about 65 Years
Hong, Sung-Wook,Chai, Won-Kyu,Lee, Myeong-Gu The Korean Society of Safety 2010 International Journal of Safety Vol.9 No.1
In this study, a series of random field test and dynamic analysis in the time domain were carried out in order to find in the reason of fatigue damage of the main and the secondary members in the 3-span continuous steel plate girder railway bridge being under in service over 60 years. From the measured and the analyzed results, the stress distribution patterns were investigated for the members with fatigue damage. In addition, global and local numerical stress analysis was performed for the members damaged severely by corrosion, to estimate variation of the distribution by corrosion. Finally, a reasonable cut-off ratio in the steel plate railway bridge will be proposed by analyzing the equivalent stress ranges according the ratio.
Routine barium enema prior to closure of defunctioning ileostomy is not necessary
Sung Yeon Hong,Do Yun Kim,Seung Yeop Oh,Kwang Wook Suh 대한외과학회 2012 Annals of Surgical Treatment and Research(ASRT) Vol.83 No.2
Purpose: The use of barium enemas to confirm the anastomotic integrity prior to ileostomy closure is still controversial. The purpose of the study was to determine the utility of routine contrast enema prior to ileostomy closure and its impact on patient management in patients with a low pelvic anastomosis. Methods: One hundred forty-five patients had a temporary loop ileostomy constructed to protect a low colorectal or coloanal anastomosis following low anterior resection for rectal cancer. All patients were evaluated by physical examination, proctoscopy, and barium enema prior to ileostomy closure. Results: The median time from ileostomy creation to closure was 8 months. Five (3.5%) of the 144 patients were found to have clinically relevant strictures at the colorectal anastomosis on routine barium enema. One patient (0.7%) showed anastomotic leak on their barium enema. Overall, 141 patients (97.9%) had an uncomplicated postoperative course. Postoperative complication occurred in three patients (2.1%). None of them showed abnormal barium enema finding, which suggested that routine contrast enema examination did not predict postoperative complication. Conclusion: Routine barium enema evaluation of low pelvic anastomoses before loop ileostomy closure did not provide any additional information for postoperative colorectal anastomotic complication.
( Sung Ae Woo ),( Hye Young Ju ),( Soon Hyo Kwon ),( Ji Hye Lee ),( Soo Jeong Choi ),( Dong Cheol Han ),( Seung Duk Hwang ),( Sae Yong Hong ),( So Young Jin ),( Hyo Wook Gil ) 대한신장학회 2014 Kidney Research and Clinical Practice Vol.33 No.4
Background: All types of membranoproliferative glomerulonephritis (MPGN) areprogressive diseases with poor prognoses. Recently, a newly proposed classificationof these diseases separated them into immune complex- and complementmediateddiseases. We investigated the frequency of C3 glomerulonephritis amongpreviously diagnosed MPGN patients. Methods: We conducted a retrospective study of patients diagnosed with MPGN atthree tertiary care institutions between 2001 and 2010. We investigated theincidence of complement-mediated disease among patients diagnosed with MPGN. Progressive renal dysfunction was defined as a 50% reduction in the glomerularfiltration rate or the need for renal replacement therapy. Results: Among the 3,294 renal biopsy patients, 77 (2.3%) were diagnosed withMPGN; 31 cases were excluded, of which seven were diagnosed with systemic lupusnephritis, and the others were not followed for a minimum of 12 months afterbiopsy. Based on the new classification, complement-mediated MPGN was diagnosedin two patients (4.3%); only one patient developed progressive renaldysfunction. Among the immune complex-mediated MPGN patients, 17 patientsdeveloped progressive renal dysfunction. Serum albumin and creatinine levels atthe time of MPGN diagnosis were risk factors of renal deterioration, after adjustingfor low C3 levels and nephrotic syndrome. Conclusion: Complement-mediated glomerulonephritis was present in 4.3% ofpatients previously diagnosed with MPGN.
Risk factors for parastomal hernia: based on radiological definition
Sung Yeon Hong,Seung Yeop Oh,Jae Hee Lee,Do Yoon Kim,Kwang Wook Suh 대한외과학회 2013 Annals of Surgical Treatment and Research(ASRT) Vol.84 No.1
Purpose: The aim of this study was to investigate the clinical and radiological incidence of parastomal hernia and to analyze the risk factors for parastomal hernia. Methods: We reviewed retrospectively 108 patients with end colostomy from January 2003 to June 2010. Age, sex, surgical procedure type, body mass index (kg/m2), stoma size, and respiratory comorbidity were documented. Results: There were 61 males (56.5%) and 47 females (43.5%). During an overall median follow-up of 25 months (range, 6 to 73 months), 36 patients (33.3%) developed a radiological parastomal hernia postoperatively and 29 patients (26.9%) presented with a clinical parastomal hernia. In multivariate analysis, gender (odds ratio [OR], 6.087; P = 0.008), age (OR, 1.109; P = 0.009) and aperture size (OR, 6.907; P 〈 0.001) proved to be significant and independent risk factors after logistic regression analysis. Conclusion: This study showed that the incidence of radiological parastomal hernia is higher than clinical parastomal hernia. Risk factors for parastomal hernia proved to be female, age, and aperture size.
Feasibility of Multiple Burr Hole With Erythropoietin in Acute Moyamoya Patients
Hong, Ji Man,Lee, Seong-Joon,Lee, Jin Soo,Choi, Mun Hee,Lee, Sung Eun,Choi, Jin Wook,Lim, Yong Cheol American Heart Association, Inc. 2018 Stroke Vol.49 No.5
<P>Conclusions-Combination therapy allows safe and effective revascularization in moyamoya patients with acute ischemic presentation.</P>
Hong, Myeong-Ki,Mintz, Gary S,Lee, Cheol Whan,Park, Duk-Woo,Choi, Bong-Ryong,Park, Kyoung-Ha,Kim, Young-Hak,Cheong, Sang-Sig,Song, Jae-Kwan,Kim, Jae-Joong,Park, Seong-Wook,Park, Seung-Jung W.B. Saunders [etc.] 2006 European heart journal Vol.27 No.11
<P>AIMS: In many countries, drug-eluting stent implantation is the dominant interventional strategy. We evaluated the clinical, angiographic, procedural, and intravascular ultrasound (IVUS) predictors of angiographic restenosis after sirolimus-eluting stent (SES) implantation. METHODS AND RESULTS: SES implantation was successfully performed in 550 patients with 670 native coronary lesions. Six-month follow-up angiography was performed in 449 patients (81.6%) with 543 lesions (81.1%). Clinical, angiographic, procedural, and IVUS predictors of restenosis were determined. Using multivariable logistic regression analysis, the only independent predictors of angiographic restenosis were post-procedural final minimum stent area by IVUS [odds ratio (OR)=0.586, 95% confidence interval (CI) 0.387-0.888, P=0.012] and IVUS-measured stent length (OR=1.029, 95% CI 1.002-1.056, P=0.035). Final minimum stent area by IVUS and IVUS-measured stent length that best separated restenosis from non-restenosis were 5.5 mm2 and 40 mm, respectively. Lesions with final minimum stent area<5.5 mm2 and stent length>40 mm had the highest rate of angiographic restenosis [17.7% (11/62)], P<0.001 compared with other groups. CONCLUSION: Independent predictors of angiographic restenosis after SES implantation were post-procedural final minimum stent area by IVUS and IVUS-measured stent length. The angiographic restenosis rate was highest in lesions with stent area<5.5 mm2 and stent length>40 mm.</P>