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논문: 건설용 이형 철근(SD35, SD30A)의 점용접성
이수연 ( Su Yeon Lee ),이찬규 ( Chan Gyu Lee ),( Vladimir S. Gornakov ),( Osamu Taguchi ),유대황 ( Dea Hwang Yoo ),윤국태 ( Kuk Tea Youn ),박대영 ( Dae Young Park ),허석환 ( Seok Hwan Huh ) 한국열처리공학회 2011 熱處理工學會誌 Vol.24 No.5
The spot weldability of metal joints between SD35 and SD30A steel was investigated. This study was aimed to determine the spot welding parameters (i.e. welding current and time) for reinforcement bar joint and to evaluate the weldability, mechanical strength, hardness and microstructure. The results indicated that shear strength and elongation of the welding joints at 12.5kA and 1000ms were 26.7kgf/mm2 and 22%, respectively. And fracture distribution of them by using shear and tensile test showed 100% necking mode and 100% ductile mode, respectively.
( Yasunori Yamamoto ),( Shinya Furukawa ),( Teruki Miyake ),( Junichi Watanabe ),( Yukihiro Nakamura ),( Yoshihiro Taguchi ),( Tetsuya Yamamoto ),( Aki Kato ),( Katsunori Kusumoto ),( Osamu Yoshida ) 대한소화기기능성질환·운동학회 2024 Journal of Neurogastroenterology and Motility (JNM Vol.30 No.2
Background/Aims Although certain allergic diseases have been reported to be associated with the prevalence of functional dyspepsia (FD) and irritable bowel syndrome (IBS), it is unclear whether the presence of multiple allergic diseases further increases the prevalence of FD and IBS. The aim of this study is to determine this issue in young people. Methods A cohort of 8923 Japanese university students was enrolled and diagnoses of FD and IBS were confirmed using Rome III criteria. Allergic disorders diagnosed at medical institutions were obtained by means of a self-administered questionnaire. Results The prevalence of FD, IBS, and their overlap was found to be 1.9%, 6.5%, and 1.1%, respectively. Pollen allergy was independently positively correlated with FD, IBS, and overlap of FD and IBS. Allergic rhinitis was positively linked to IBS. Drug allergy was positively associated with FD. The presence of multiple allergic diseases was positively correlated with FD and IBS (FD: adjusted OR for 2 allergic diseases: 1.95 [95% CI, 1.24-2.98], P for trend = 0.003; and IBS: adjusted OR for 1 allergic disease: 1.40 [95% CI, 1.15- 1.69], 2 allergic diseases 1.47 [95% CI, 1.12-1.91], and 3 or more allergic diseases: 2.22 [95% CI, 1.45-3.28], P for trend = 0.001). Additionally, the concomitant existence of multiple allergic diseases was also demonstrated to have a trend that correlated with the overlap of FD and IBS (P for trend = 0.018). Conclusion Allergic disease multimorbidity is positively correlated with the prevalence of FD and IBS in a young population. (J Neurogastroenterol Motil 2024;30:229-235)