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편심 압축력을 받는 스테인리스 원형강관 기둥의 곡률형상에 따른 좌굴내력에 관한 실험적 연구
장호주,서성연,양영성 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.3
This study is a series of experimental investigation on the buckling strengths of eccentrically compressed cold formed stainless steel CHS(circular hollow section) columns. The principal parameters in this study are slenderness ratios( λ=30, 50, 70) and magnitude of eccentricity e(0, 2.5, 5.0, 7.5, 10㎝) on the direction of end moment. The direction of end-moment means 3 different bending moment distributions. Objectives this study are to obtain the maximum loads and moments by performing an experimental work and to compare the experimental behaviors with the design standard curves, AIK-LSD and AISC-LRFD, AIJ-LSD, SIJ-ASD curves. The ultimate buckling strengths and bending moments of circular section members are evaluated by a method in accordance with design standard curves. Therefore this paper attempts design standard for the use of these stainless steel columns as structural compression members. The numerically obtained ultimate buckling strengths and bending moments design standard curves of beam columns show a reasonably good agreement with the available experimental results.
축력과 양단 대칭모멘트를 받는 스테인리스 원형강관 기둥의 좌굴내력에 관한 실험적 연구
장호주,서성연,양영성 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.3
This study is a series of experimental investigation on the buckling strengths of eccentrically compressed cold-formed stainless steel CHS(circular hollow section) columns. The principal parameters in this study are slenderness ratios(L_(k)/r = 30, 50, 70) and magnitude of eccentricity e(0, 2.5, 5.0, 7.5, 10㎝) on the symmetrical end moment. Objectives this study are to obtain the maximum loads by performing an experimental work and to compare the experimental behaviors with analytical results. The ultimate buckling strength of CHS members are evaluated by a numerical method in accordance with the axial force-bending moment(P-M) interaction curves. The behavior of each specimen is displayed in the form of moment angle(M- θ) relationship. The numerically obtained ultimate buckling interaction curves of beam columns show a reasonably good agreement with the available experimental results of slenderness ratios(L_(k)/r = 30, 50). But experimental results of slenderness ratios 70 were below M-P interaction curve.
Ju Rak Lim,Ju Kim,Seong Soo Cheong,Dong chil Choi,Chang yeon Hwang 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10
This study was conducted for establishment of Economic injury levels(EILs) of the tea red spider mite, Tetranychus kanzawai on Rubus coreanus. T. kanzawai was innoculated on May 7 in differently 0, 5, 10, 20 and 40 adults per plant. And pesticide was treated in late April, early May, middle May and late May, respectively. After inoculated of T. kanzawai, the density was increased until the mid-June and decreased gradually in all plots. And higher inoculation density were increased higher than lower inoculation density. Growth variables were not different among experimental plots except number of fruit set, but the number of fruit set and yields were decreased with increasing initial mite density. Densities of T. kanzawai on treated time of pesticide was lower in later treatment time than early treatment time. The late April treatments were not effective of pesticide in harvesting season. The rates of yield loss increased with increasing initial mite density. The relationship between initial T. kanzawai densities and yield losses was well described by a linear regression, Y = 0.6545X + 3.0425, R2=0.9313. Based on the relationship, the number of adults per plant which can cause 5% loss of yield was estimated to be approximately 3.0. And EILs was estimated to be approximately 8.3 adults/leaf in mid-May.
( Seong-hee Kim ),( Yong-man Kim ),( Ju-hyeon Nam ),( Yeong-tak Kim ),( Jong-hyeok Kim ),( Dae-sik Suh ),( Jeong-yeol Park ),( Shin-hwa Lee ),( Ju-hee Kim ),( Ji-hoon Lee ),( Oak-ju Kang ),( Dae-yeon 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-
Objective: The controversy between the proponents of radical pelvic surgery and those of radiotherapy for primary treatment in early cervical cancer still exists for a long time. The aim of this study is to demonstrate the efficacy of radical hysterectomy as primary treatment in non-bulky node-positive early cervical patients. Methods: Patients that were diagnosed with cervical cancer and received RH at Asan Medical Center between January 2013 and December 2015 were identified from an electronic database at our center, and their medical records were reviewed retrospectively. The eligibility criteria for patients inclusion in this study were as follows: previously untreated; pathologically diagnosed cervical cancer; an age of 20-80 years at the time of surgery; laparoscopic or open radical hysterectomy with pelvic and/or para-aortic lymphadenectomy; clinical tumor or MIR tumor size under 4cm and lymph node positive in imaging study. Patients whose cell type was small cell carcinoma or neuroendocrine carcinoma, who underwent neoadjuvant chemotherapy, or who had other coexisting malignancies were excluded. Results: Of the 53 patients, 6 patients (11.3%) were recurred, and 4 patients were died among the recurred patients. 15 patients (28.3%) were not received any adjuvant therapy after radical hysterectomy. 2years overall survival was 93%, and 3years overall survival was 90% in non-bulky lymphadenopathy cervical cancer patients. 2years recurrence-free survival rate was 86%. 15 patients (28.3%) were not received any adjuvant therapy after radical hysterectomy. Conclusion: In non-bulky lymphadenopathy cervical patients who received radical hysterectomy as primary treatment, it presented good overall survival and recurrence-free survival rates. It was single-arm study. The necessity of multicenter prospective randomized controlled comparative study between radical pelvic surgery and radiotherapy as primary treatment in high risk early cervical cancer was highly required.
Ju Yeon Lee,Jung-Man Namgoong,Seong Chul Kim,Dae Yeon Kim 대한외과학회 2020 Annals of Surgical Treatment and Research(ASRT) Vol.98 No.3
Purpose: Necrotizing enterocolitis and intestinal perforation are the most common surgical emergency in the neonatal intensive care unit. The purpose of this study is to evaluate if peritoneal drainage (PD) is beneficial in extremely low birth weight infants with intestinal perforation. Methods: Retrospective cohort study of extremely low birth weight infants with a diagnosis of intestinal perforation. They were received primary PD (n = 23, PD group) or laparotomy (n = 13, LAP group). Laboratory and physiologic data were collected and organ failure scores calculated and compared between preprocedure and postprocedures. Data were analyzed using appropriated statistical tests. Results: Between January 2005 and December 2015, 13 infants (male:female = 9:4) received laparotomy. Of 23 infants (male:female = 16:7) received PD, 20 infants received subsequent laparotomy. There were no demographic differences between PD and LAP groups. And there were no differences in total organ score in either group (PD, P = 0.486; LAP, P = 0.115). However, in LAP group, respiratory score was statistically improved between pre- and postprocedure organ failure score (P = 0.02). In physiologic parameter, PD group had a statistically worsening inotropics requirement (P = 0.025). On the other hand, LAP group had a improvement of PaO2/FiO2 ratio (P = 0.01). Conclusion: PD does not improve clinical status in extremely low birth weight infants with intestinal perforation