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Metallurgical connection methods, such as stud weld and puddle weld, have been used for a long time to attach a steel beam and a steel deck. Recently, the mechanical connection method has been used as an alternative to the metallurgical connection method. This method uses the explosive power of gunpowder to instantaneously drive a pin to combine a steel deck and a steel beam. This mechanical connection method has many advantages over metallurgical connection methods. First of all, a power supply is unnecessary and there are no concerns about an electrical accident. However, the handling of the mechanical connection method takes severs caution. Since the sound at the time of installation is loud, discretion is needed in a quiet place. Above all, when a pin is installed in a steel beam, the cross-section of the steel beam is reduced. Therefore, the effect of the pin on the tensile properties of the steel beam is the focus of this research. The main parameters are steel plate thickness, notch thickness, steel type, and damage types, that is, non-damage, drilled hole, and driving pin. This research supplies the fundamental data to the design criterion of this mechanical method by clarifying the influence of the mechanical method on the tensile property of the structural steel member. In a results, the strength and stiffness specimens using driving pin was raised but decreased deformation capacities and elongation.
김원 ( Won Kim ), 이은용 ( Eun Yong Lee ), 김대성 ( Dae Sung Kim ), 정수현 ( Su Hyun Jung ), 안식일 ( Sik Il Ahn ), 박종학 ( Jong Hak Park ), 오재민 ( Jae Min Oh ), 김윤태 ( Yun Tae Kim ), 이영현 이동원 ( Dong Won Lee ), 이종문 ( John M Rhee) 한국조직공학과 재생의학회 2009 조직공학과 재생의학 Vol.6 No.4
This study was carried out to find the formation of solid dispersion for overcoming initial burst of pioglitazone HCl. We prepared pioglitazone HCl solid dispersion as contents of polymeric material as hydroxypropyl methylcellulose(HPMC). HPMC is the most important hydrophilic carrier used for the preparation of oral controlled drug delivery systems. One of its most important characteristics is the high swellability, which has a significant effect on the release kinetics of an incorporated drug. We analyzed surface of solid dispersed sample by scanning electron microscope(SEM) and X-ray diffraction(XRD) was used to analyze the crystallinity. Also the change of structure and crystallinity characteristic of solid dispersion tablet were analyzed by fourier-transform infrared spectoscopy(FT-IR). We prepared tablet with solid dispersion by direct compression and observed in vitro release behavior of solid dispersion from tablets in gastric juice(pH 1.2). The result was compared with release behavior of commercial drug(Actos(R)) and solid disperesd pioglitazone HCl.