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The modeling of 3D finite elements based on CAD data has been used to detect sites of corrosiondefects in buried pipes. The results generated sophisticated profiles of electrolytic potential and vectorsof current distributions on the earth surface. To identify the location of defects in buried pipes, thecurrent distribution on the earth surface was projected to a plane of incidence that was identical tothe pipe locations. The locations of minimum electrolytic potential value were found. The results showadequate match between the locations of real and expected defects based on modeling. In addition,the defect size can be calculated by integrating the current density curve. The results show that thedefect sizes were 0.74 m2 and 0.69 m2, respectively. This technology may represent a breakthroughin the detection of indirect damage in various cases involving multiple defects in size and shape,complex/cross pipe systems, multiple anodes and stray current.
In this study, a robot manipulator is modelled as a cantilever beam, which moves in an axial direction, has a lumped mass at the end, and is supported by intermediate springs. Considering the tip mass and intermediate springs in the modeling, we derive the equations of motion in which the rigid-body motion is coupled with the flexible motions, and then analyze the transverse vibrations of the beam. Furthermore, we study the tip mass effects on the natural frequencies and the corresponding mode shapes. The natural frequency loci veering is analyzed for variations in the tip mass and the spring position/stiffness. In addition, we investigate the exchange and localization of modes around these veering regions as well as the parameter effects on the mode shapes. Using a Short-time Fourier transform (STFT), the relationship between the dynamic characteristics and dynamic responses are described. It is found that the dynamic characteristics of the beam are dependent on the veering distance. It is also shown via dynamic responses that the mode exchanges occur when a veering distance is close.
Background: This study evaluated the effects of pre-anesthetic administration of dexmedetomidine on sedative, cardiovascular, and recovery parameters. Methods: This was a prospective, randomized, double-blind, placebo-controlled study. We selected 60 patients who were scheduled to undergo laparoscopic cholecystectomy. They were randomly divided into two groups and received 0.5 mg/kg of dexmedetomidine (group D) or normal saline (group S) over 10 minutes before induction of anesthesia. The Ramsay sedation scale (RSS) score and bispectral index (BIS) were recorded after completion of the dexmedetomidine infusion. Mean arterial pressure (MAP), heart rate (HR), peripheral pulse oximetry, cardiac output (CO), and systemic vascular resistance (SVR) were recorded. The modified Aldrete recovery score (MARS) was recorded in the recovery room. Results: After completion of the dexmedetomidine infusion, BIS reduction was less than 20% (97.1 ± 2.4, 83.8 ± 4.8; P < 0.001), but RSS-rated sedation was appropriate (P < 0.001). HR was lowest at the end of the dexmedetomidine infusion and there was a significant difference between groups (P < 0.001); however, MAP was not significantly different between groups (P = 0.139). CO was lowest and SVR was highest at the end of the dexmedetomidine infusion. There was no significant difference in MARS values between groups (P = 0.190). Conclusions: A pre-anesthetic dexmedetomidine (0.5 mg/kg) provided appropriate sedation without serious changes in cardiovascular parameters or a prolonged recovery time.
The purpose of this study was to develop dressing foam with drug immobilization abilities by using Azidophenyl alginate (Az-alginate). We characterized prepared Az-alginate. Through the patterning test, immobilization of drug was confirmed. Degrees of photo-curing were identified by the photo-curing ratio test. Cytotoxicity test confirmed that Az-alginate was biocompatible. The protein releasing test measured the degree of drug released according to the concentration of Az-alginate. By examination of the water absorbency and moisture vapor transmission rate, characteristics of the dressing foam with photo-cured Az-alginate were measured. From the results of these tests, Az-alginate can be applied to the dressing foam.
본 연구에서는 CFRP와 금속 또는 비금속을 접착제로 접합시켜 이 재료에 대한 파손 연구를 수행하였다. 그 해석 조건으로는 DCB 시험편을 이용하여 시험편의 상부에는 CFRP, 시험편의 하부에는 금속 또는 비금속 재료로 지정하였고 두 상부와 하부 사이를 구조용 접착제로 부착하는 것을 묘사하였다. 이 해석 결과로는 알루미늄으로 접착된 시험편에서 가 장 작은 등가응력 보였고 티타늄을 사용하였을 때 박리된 CFRP시험편에서의 최대 전단응력은 가장 낮음을 보였다. 결론적 으로 티타늄을 사용하였을 때 시험편의 변형이 가장 작은 것을 알 수 있었고 본 연구 결과를 토대로 접착제를 이용한 접착 계면의 파손데이터를 실생활에 융합하여 그 미적 감각을 나타낼 수 있다. In this study, CFRP and metal or nonmetal were bonded with adhesive and the fracture study on this material was carried out. CFRP at the upper side of specimen and metal or nonmetal were assigned at the lower side of specimen by using DCB specimen as the analysis condition. And it was desribed that the structural adhesive were bonded between both upper and lower sides. As this analysis result, the least equivalent stress was shown at the specimen bonded with aluminium. The maximum shear stress was shown to become lowest at the de-bonded CFRP specimen when titanium was used. In conclusion, it was shown that the deformation of specimen became lowest when titanium was used. On the basis of this study result, the esthetic sense can be shown as the fracture data of bonded interface using adhesive are grafted onto the real life.