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유효선,김은아 한국의류학회 1998 한국의류학회지 Vol.22 No.1
Polyester filaments were dyed with disperse dye in dyebath containing water and water miscible organic solvents : acetone, 1,4-dioxane, DMF. In case of Acetone and 1,4-dioxane, the equilibrium dyeuptake was maximun at the volume fraction 0.05. The equilibrium dye uptakes were decreased as volume fraction of organic solvents were increased. When the volume fractions of water miscible organic solvents were varied, dye uptake was increased constantly with dyeing time. In dyebath containing water and water miscible organicsolvent, the dyeuptake was increased quickly during initial 40∼60 min. and slowly increased there after. The slope of C_t/C_∞ to √t was greater in dyebath containing water and water miscible organic solvents than dyebath containing water. The differences of the slope with volume fractions of water miscible organic solvent were not shown big.
조선형,유효진 청주교육대학교 과학교육연구소 2001 科學과 數學敎育論文集 Vol.22 No.-
The preconception is socalled the naive theories was made according to the general experience, direct investigation, wrong explanation on textbook or bibliography material and different of culture. By Champagne and klopfer(1983) find out that the preconception are latent in those blains long time, so they cause serious influences to the general teaching method without special healing. The researches on the air unit in primary school are first, the concept of air volume and its weight, secondly the difference of concepts between urban and local area, and third the distinction of sex. In this work, there are formed preconception in the third grade children primary school, urban children thought are more than local, and last male children have more right thought than female both urban and local area.
BTCA 처리 면직물의 질소계양이온화제 첨가에 의한 염색성 향상에 관한 연구
박은경,유효선 한국의류학회 2000 한국의류학회지 Vol.24 No.6
The purpose of this study is to produce cotton fabric having improved dyeability and colorfastness as well as retaining the desirable durable press property. When cotton fabric was treated with additives, nitrogen content was increased as the additive concentration was increased. DP ratings and wrinkle recovery properties of BTCA treated cotton fabrics were greatly increased. But DP rating was lowered slightly by adding additives and wrinkle recovery property was decreased with the increase of additive concentration. Tensile strength was decreased by BTCA treatment but increased as additive concentration was increased. Various BTCA/additive treatments produced great affinity for reactive and acid dyes when dyebaths were adjusted at pH 3. It was showed that dyeability was increased as additive concentration was increased. The most effective additive for improving the dyeing properties of the crosslinked cotton was TEA·HCl In case of reactive dye, there was almost no improvement on the dyeability of finished cotton by adding salt. Color fastness to washing and light of finished and dyed cotton were low except for the washfastness of reactive dye. Dyeing the BTCA/additive treated cotton fabrics with reactive dye had no effect on the physical properties.
김은아,유효선 한국의류학회 2002 한국의류학회지 Vol.26 No.9,10
To Save energy and cost, one bath/one step dyeing and finishing on cotton/polyester blends is carried out with disperse dyes in the presence of cross linking agent. Cotton 100 %, cotton/polyester 70/30, 50/50, 35/65, polyester 100 % fabrics were used. wrinkle recovery angle, tensile strength retention and tearing strength retention were determined in according to the dye bath composition, and also determined while the concentration of DMDHEU, molecular weight and concenteration of PEG were varied. Colorfastness to abrasion, washing and light were tested. For cotton and cotton/polyester blends dyed in the presence of DMDHEU/PEG, wrinkle recovery was improved. Tensile strength retention and tearing strength retention were decreased, in compared with dyed fabrics without DMDHEU. Colorfastness to abrasion was good but colorfastness to washing and to light were poor for the fabrics dyed in the presence of DMDHEU/PEG.
Minimally-invasive neonatal surgery: laparoscopic excision of choledochal cysts in neonates
Hyo Seon Ryu,Ju Yeon Lee,Dae Yeon Kim,Seong Chul Kim,Jung-Man Namgoong 대한외과학회 2019 Annals of Surgical Treatment and Research(ASRT) Vol.97 No.1
Purpose: Improvements in surgical techniques and a better understanding of the unique anesthetic requirements in neonates undergoing laparoscopy have suggested that laparoscopic surgery may be effective in newborns. This study therefore evaluated the safety and feasibility of laparoscopic excision of the cyst (LEC) in neonates. Methods: This retrospective study included 43 neonates who underwent excision of choledochal cysts between November, 2001, and January, 2018, including 21 who underwent open excision and 22 who underwent LEC. Their perioperative and surgical outcomes were reviewed. The patients were followed up for a median 37 months (range, 3–141 months). Results: Baseline characteristics did not differ significantly in the open and LEC groups. Mean intraoperative peak partial pressure of arterial CO2 (PaCO2) (45.5 mmHg vs. 48.0 mmHg) and total operation time (208.3 ± 71.0 minutes vs. 235.0 ± 47.2 minutes) were similar in both groups. Parents of the patients in the LEC group provided a more positive evaluation of scar scale and greater satisfaction with wound. No patient in either group experienced any critical complications. Three patients in the open excision group required readmission for cholangitis and 2 patients had ileus. No patient in the laparoscopic excision group experienced any postoperative complications during follow-up. Conclusion: Despite difficulties performing laparoscopic surgery in neonates, LEC was safe and feasible when intraperitoneal peak pressure was maintained under 10 mmHg and PaCO2 was closely monitored by a pediatric anesthesiologist. Compared with open excision, LEC provided improved cosmetic outcomes without severe complications. Prospective randomized studies with large numbers of patients are warranted
Hyo Seon Ryu,Se Hoon Jung,Eun Hae Cho,Jeong Min Choo,Ji-Seon Kim,Se-Jin Baek,Jin Kim,Jung-Myun Kwak 대한외과학회 2024 Annals of Surgical Treatment and Research(ASRT) Vol.106 No.3
Purpose: The coronavirus disease 2019 (COVID-19) pandemic has led to significant global casualties. This study examines the postoperative impact of COVID-19 on patients who underwent gastrointestinal surgery, considering their heightened vulnerability to infections and increased morbidity and mortality risk. Methods: This retrospective observational study was conducted at a tertiary center and patients who underwent gastrointestinal surgery between January 2022 and February 2023 were included. Postoperative COVID-19 infection was defined as the detection of severe acute respiratory syndrome coronavirus 2 RNA by RT-PCR within 14 days after surgery. Propensity score matching was performed including age, sex, American Society of Anesthesiology physical status classification, and emergency operation between the COVID-19-negative (–) and -positive (+) groups. Results: Following 1:2 propensity score matching, 21 COVID-19(+) and 42 COVID-19(–) patients were included in the study. In the COVID-19(+) group, the postoperative complication rate was significantly higher (52.4% vs . 23.8%, P = 0.023). Mechanical ventilator requirement, intensive care unit (ICU) admission, and readmission rate did not significantly differ between the 2 groups. The median length of ICU (19 days vs . 4 days, P < 0.001) and hospital stay (18 vs . 8 days, P = 0.015) were significantly longer in the COVID-19(+) group. Patients with COVID-19 had a 2.4 times higher relative risk (RR) of major complications than patients without COVID-19 (RR, 2.37; 95% confidence interval, 1.254–4.467; P = 0.015). Conclusion: COVID-19 infection during the postoperative period in gastrointestinal surgery may have adverse outcomes which may increase the risk of major complications. Preoperative COVID-19 screening and protocols for COVID-19 prevention in surgical patients should be maintained.