물/극성유기용매 혼합욕에서 폴리에스테르의 염색

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.

초등학교 학생들의 공기에 대한 선개념 조사

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.

가교제와 분산염료를 이용한 면/폴리에스테르 혼방직물의 염색 : 그에 따른 물성 변화 및 염색견뢰도 The Changes of Physical Properties and Colorfastness

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.

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.

Current status and role of robotic approach in patients with low-lying rectal cancer

Hyo Seon Ryu,Jin Kim 대한외과학회 2022 Annals of Surgical Treatment and Research(ASRT) Vol.103 No.1

Utilization of robotic surgical systems has increased over the years. Robotic surgery is presumed to have advantages of enhanced visualization, improved dexterity, and reduced tremor, which is purported to be more suitable for rectal cancer surgery in a confined space than laparoscopic or open surgery. However, evidence supporting improved clinical and oncologic outcomes after robotic surgery remains controversial and limited despite the widespread adoption of robotic surgical systems. To date, numerous observational studies and a few randomized controlled trials have failed to demonstrate that short-term, oncological, and functional outcomes after a robotic surgery are superior to those of laparoscopic surgery for low rectal cancer patients. The objective of this review is to summarize the current state of robotic surgery and its impact on low-lying rectal cancer.

Cumulative Incidence and Risk Factors for Pouch Adenoma in Familial Adenomatous Polyposis Patients Following a Restorative Proctocolectomy

Hyo Seon Ryu(유효선) 대한외과학회 2021 대한외과학회 학술대회 초록집 Vol.2021 No.5

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

Prognostic significance of lymph node yield on oncologic outcomes according to tumor response after preoperative chemoradiotherapy in rectal cancer patients

Hyo Seon Ryu,In Ja Park 대한종양외과학회 2022 대한임상종양학회 학술대회지 Vol.2022 No.2

Dyeing of Cotton Fabrics with Loess Using Soybean Milk : The Compositions of Loess Deposited on the Cotton Fabrics 면직물에 부착된 황토의 성분분석을 중심으로

Ryu, Hyo Seon,Kim, Soo Jung 한국의류학회 2001 한국의류학회지 Vol.25 No.10

황토는 대표적인 천연 무기염재의 일종으로서 바람에 의해 운반되어 퇴적된 담황색 내지는 황회색을 띠는 실트질의 퇴적물을 일컫는다. 황토의 구성물질은 주로 석영, 장석, 산화철광물, 깁사이트 등의 여러 가지 점토광물을 포함하는데, 주로 적색을 띠는 것은 소량의 산화철 광물에 기인되는 경우가 많으며 황토를 구성하는 점토광물로는 버미큘라이트, 카오린 광물인 캐올리나이트와 할로이사이트, 일라이트 등이 있다. 본 연구에서는 면직물에 천연 무기염재인 황토를 사용한 염색시에 황토 단독염색과 콩즙 전처리 후 황토염색으로 나누어 염색을 실시하고, 원료 황토와 황토염색 후 면직물에 부착된 성분 간에 차이가 있는지를 확인하기 위해 X선 형광분석(X-ray fluorescence analysis, XRF)을 이용하여 염색 전·후 황토의 성분을 분석하였고, X선회절분석(X-ray diffraction analysis, XRD)을 이용하여 황토 및 염색 전·후 면직물에 부착된 광물질의 주성분을 분석하였으며, energy dispersive spectrometer(EDS)가 장착된 주사전자현미경을 이용하여 면직물에 부착된 광물의 성분을 조사하였다. 그 결과, 황토로 면직물을 염색하는 경우 면직물에 부착되는 황토의 양과 K/S 값은 거의 비례하여 증가하는 것으로 나타났다. 황토 염색 후 면직물에 부착되는 주성분은 주로 SiO_2, Al_2O_3, Fe_2O_3 등인 것으로 나타났으며, X선 회절분석과 EDS 분석에 의해 캐올리나이트, 일라이트 등의 점토광물의 형태로 존재하는 것인 확인되었다.

Impact of COVID-19 infection during the postoperative period in patients who underwent gastrointestinal surgery: a retrospective study

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.