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탄소성 변형을 받는 냉간 압연강의 X선 잔류응력 특성에 관한 연구
홍순혁,이동우,양광호,조석수,주원식 동아대학교 생산기술연구소 2000 生産技術硏究所硏究論文集 Vol.5 No.1
In textured material, diffraction angle 2θ usually shows a nonlinear relation against sin^2Ψ due to elastic anisotropy of crystals. SPHD and SPCD steel is cold-rolled carbon steel for automobile. The characteristics X-ray for stress measurement is Cr K_α and Mo K_α1characteristic X-ray. The sin^2Ψ-2θ diagram under elastic strain seems to have a linear behavior using regression line of data but has a nonlinear behavior in distribution of data by Cr K_αcharacteristic X-ray. As the plastic strain of specimen increases, the nonlinearity of 2θ with respect to sin^2Ψ increases remarkably. On the other hand, the diffraction angle 2 θ by Mo K_α1 characteristic X-ray shows a good linearity on sin^2Ψ-2θ diagram under plastic strain as well as elastic strain. Therefore, This paper presents the measurement of residual stress in cold-rolled carbon steel for automobile using penetration depth of Mo K_α1 charateristic X-ray and multiplicity factor of crystal diffraction plane.
흉골골절이 의심되는 외상환자에서 초음파의 진단적 효용성
염석란,김재광,이근,박철완,양혁준,현성열,임용수,진욱 대한응급의학회 2001 대한응급의학회지 Vol.12 No.3
Purpose: This study compared the value of ultrasonography(US) in the diagnosis of sternal fractures with those of conventional radiography and bone scan. Material and Method: From March 2000 to March 2001, in Gil Medical Center, Gachon Medical College, 44 patients(22 women and 22 men, mean age 46 years, range 5∼81 years) complained of tenderness in the sternal area. The cases histories of these patients with clinically suspected sternal fracture due to blunt trauma were prospectively studied. At the time of admission, conventional radiography(sternal view) was done. At one day after admission, sternal ultrasonography was obtained, and after 4∼5 days, a bone scan was done. Sternal ultrasonographic findings, conventional radiographic findings, and bone-scan findings were compared. In addition, a 12-lead ECG was done. When it was necessary, cardiac enzyme was checked and echocardiography was performed. Result: In 21 of 44 patients(48%), a sternal fracture was found by sternal US. Only 9 of 21 patients (43%) were diagnosed as having a sternal fracture by using conventional radiography. 23 of 44 patients (52%) have negative findings on sternal US; they also had negative findings on conventional radiography. Except for 7 unchecked patients, 13 of 21 patients(62%) were diagnosed as having a sternal fracture by bone scan, and among the 23 patients who had negative findings on sternal US, the 19 patients checked with a bone scan also had negative findings. Conclusion: Sternal US can find sternal fractures that are difficult to find on conventional radiography. Compared with bone scan, sternal US takes a shorter time and sternal US is not difficult. Additionally, combined lesions with sternal fractures(peristernal hematoma, soft tissue swelling) and costar cartilage fractures are diagnosed more easily when using sternal US.
( Hyuk Soo Eun ),( Min Jung Kim ),( Hye Jin Kim ),( Kwang Hun Ko ),( Hee Seok Moon ),( Eaum Seok Lee ),( Seok Hyun Kim ),( Heon Young Lee ),( Byung Seok Lee ) 대한간학회 2011 Clinical and Molecular Hepatology(대한간학회지) Vol.17 No.3
Background/Aims: This study was conducted to investigate the assessment of treatment efficacy of radiotherapy (RT) and other therapeutic modalities compared with palliative care only for treatment with advanced hepatocellular carcinoma (HCC). Methods: From 2002 to 2010, based on the case of 47 patients with advanced HCC, we have investigated each patients` Child-Pugh`s class, ECOG performance, serum level of alpha fetoprotein and other baseline characteristics that is considered to be predictive variables and values for prognosis of HCC. Out of overall patients, the 29 patients who had received RT were selected for one group and the 18 patients who had received only palliative care were classified for the other. The analysis in survival between the two groups was done to investigate the efficacy of RT. Results: Under the analysis in survival, the mean survival time of total patients group was revealed between 30.1 months and 45.9 months in RT group, while it was 4.8 months in palliative care group, respectively. In the univariate analysis for overall patients, there were significant factors which affected survival rate like as follows: ECOG performance, Child-Pugh`s class, the tumor size, the type of tumor, alpha fetoprotein, transarterial chemoembolization, and RT. The regressive analysis in multivariate Cox for total patients. No treatment under radiotherapy and high level of Child-Pugh`s class grade were independent predictors of worse overall survival rate in patients. In contrast, for the subset analysis of the twenty-nine patients treated with radiotherapy, the higher serum level of alpha fetoprotein was an independent predictors of worse overall survival rate in patients. Conclusions: We found that the survival of patients with advanced HCC was better with radiotherapy than with palliative care. Therefore, radiotherapy could be a good option for in patients with advanced HCC. (Korean J Hepatol 2011;17:189-198)