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아연 코팅과 열처리에 따른 알루미늄 열교환기 소재의 부식
조수연 ( Soo Yeon Cho ),김재중 ( Jae Jung Kim ),장희진 ( Hee Jin Jang ) 한국부식방식학회(구 한국부식학회) 2019 Corrosion Science and Technology Vol.18 No.1
The effects of zinc coating and heat treatment on the corrosion resistance of aluminum alloys including A1100 and the modified A3003, used as heat exchanger tube were investigated in this study. The grain size of the heat-treated specimen is larger than that of the specimen without heat treatment, but the grain size did not significantly affect the corrosion behavior. The concentration of zinc was noted at 11.3 ~ 31.4 at.% for the as-received Zn-coated samples and reduced to 1.2 ~ 2.4 at.% after the heat treatment, as measured by the scanning electron microscopy (SEM) with an energy dispersive spectrometer (EDS) on the surface. The concentration of oxygen is 22 ~ 46 at.% for the zinc coated specimens while noted at 7.4 ~ 12.8 at.% for the specimens after the removal of the coating. The corrosion behavior depended largely on the concentrations of zinc, aluminum, and oxygen on the specimen surface, but not on the Mo content. The corrosion potential was high and the corrosion rate was low for a specimen with a low zinc content, a high aluminum content, and a high oxygen content.
조수연(Soo Youn Cho),이승복(Seung-Bok Leigh) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.11
In accordance with 2015 Paris agreement, each individual country around the world should voluntarily propose not only its (individual) reduction target, but also actively develop and present expansion targets of its scope and concrete reduction goals exceeding the previous ones. Accordingly, it is necessary to prepare a macroscopic, long-range strategy for reducing energy consumption and greenhouse gas emissions, which can cover a single building, town, city and eventually even a province. The purpose of this research is to gather and compile government-acquired data from various sources and (in accordance with contents and specificity), combine building data by stages by using multi-variable matrix and then analyze the significance of combined data for each stage. The first order data presents the probability and the cost effectiveness of energy saving on the scale of a city or a province, based only upon general information, size and power consumption of buildings. The second order data can identify a pattern of energy consumption for a building of a specific purpose and which tends to consume a larger amount of energy during one particular season (than others). Finally, the third order data can derive influential factors (base load, humidity) from the energy consumption pattern of a building, and thus propose an informed and practical energy-saving method to be applied in real time.
조수연(Cho Su-yeon),이현수(Lee Hyun-soo) 한국디자인학회 2010 한국디자인학회 학술발표대회 논문집 Vol.2010 No.10
In the past, most of companies competed through the price, quality and value of their products. However, we require new marketing tools which are differentiated from former strategies because these elements cannot be components of special marketing strategies anymore as the market has been digitalized and globalized. Meanwhile, since digital technology has features of Hypermedia, Mutability, Communication, Interactivity, it can be applied to the optimal way which makes connection between the products and consumers. Creating an opportunity to interact among companies, products and customers through the digitalized space is a new marketing paradigm which consumers experience products and companies transmit brand image to customer. The objectives of this study are to clarify on definition of space marketing, to analyze not only characters of the digital technology but also cases of digitized spaces, and to suggest the direction where space marketing should go. In conclusion, this study presents notion of the space marketing and discusses various important issues in space marketing area for the current consumers. In addition, it shows that the interactive information technology provides special experience to customers.
조수연 ( Su Yeon Cho ),문현종 ( Hyeon Jong Moon ),김지원 ( Ji Won Kim ),조석기 ( Suk Ki Cho ),김병관 ( Byeong Gwan Kim ),주세경 ( Sae Kyung Joo ),김영훈 ( Young Hoon Kim ),박진선 ( Jin Sun Park ),최원제 ( Won Jae Choi ),김수환 ( S 대한소화기학회 2013 대한소화기학회지 Vol.61 No.2
목적: 저자들은 식도 점막하종양을 수술로 치료한 예를 분석 하고 과거 보고와 비교하여 국내에서의 식도 점막하종양의 특 성을 파악하고 이를 통해 향후 방침을 세우는 데 참고하고자 하였다. 대상 및 방법: 2005년부터 2012년까지 서울특별시보라매병 원과 분당서울대학교병원에서 식도 점막하종양을 진단받고 수술을 시행받은 18예를 후향적으로 분석하였다. 결과: 환자의 평균 연령은 48.9세였고, 남녀 비는 2.6:1였고, 대부분 무증상(77.8%)이었다. 대부분은 중부(55.6%)와 하부 식도(44.4%)에 위치하였고, 크기는 3-5 cm (55.6%)과 3 cm 이하(33.3%)인 경우가 많았다. 내시경초음파에서 병변은 대 부분 네번째 층(83.3%)에 존재하였고, 저에코 (72.2%)로 관찰 된 경우가 많았으며, 고에코 (11.1%) 또는 혼재된 에코(11.1%) 로 관찰된 경우도 있었다. 평활근종으로 진단한 경우가 가장 많았고(55.6%), 수술을 시행한 이유는 악성이 의심되거나 (38.9%) 병변의 크기가 큰 경우(33.3%) 및 크기 증가(11.1%) 등이었다. 수술은 대부분 흉강경을 이용한 적출술(83.3%)을 시행하였고, 병변의 평균 크기는 5.4 cm였으며, 6-10 cm 사 이인 경우(38.9%)가 가장 많았고, 3-5 cm 사이인 경우 (33.3%)가 그 다음으로 많았다. 최종 진단은 평활근종이 대부 분이었고(88.9%), 나머지는 위장관 기질종양(11.1%)이 차지 하였다. 결론: 식도 점막하종양은 평활근종이 가장 흔하였으나, 내시 경초음파로 위장관 기질종양과의 감별이 매우 어려웠다. 악성 이 의심되거나 증상을 동반하는 경우에는 흉강경을 이용한 최 소 침습 수술이 치료에 적절할 것으로 판단된다. Background/Aims: Submucosal tumors of the esophagus are rare lesions among all esophageal neoplasms. The purpose of this study was to evaluate the clinicopathologic features of esophageal submucosal tumors treated by surgical approach. Methods: We analyzed the clinicopathologic and endoscopic ultrasonographic features of 18 esophageal submucosal tumors which were treated by surgical approach at Boramae Medical Center and Seoul National University Bundang Hospital from January 2005 to June 2012. Results: The mean age was 48.9 years old and male to female ratio was 2.6:1. Asymptomatic patients were most common (77.8%). In endoscopic ultrasonographic finding, the majority tumor arouse in the middle (55.6%) and lower (44.4%) esophagus, and appeared as hypoechoic lesion (72.2%) in the 4th layer (83.3%). The most common indication for surgical approach was unclear biological behavior of the tumor. Minimally-invasive technique using thoracoscopy was applied for the enucleation (83.3%). The mean diameter of the tumor was 5.4 cm, and the final diagnosis was leiomyoma (89.9%) and gastrointestinal stromal tumor (11.1%). Conclusions: Leiomyoma was the most common submucosal tumor in esophagus. However, endoscopic ultrasonography was not able to differentiate between leiomyoma and gastrointesinal stromal tumor. For more accurate diagnosis and treatment, minimally-invasive approaches may be suitable for the surgical enucleation of indicated esophageal submucosal tumor.
8주간 유산소 훈련에 따른 여자대학생의 항산화능 및 임파구 DNA 손상 변화
조수연(Su Youn Cho),노희태(Hee Tae Roh) 한국사회체육학회 2011 한국사회체육학회지 Vol.0 No.44
The purpose of this study is to examine the effects of endurance exercise training on antioxidant capacity and lymphocyte DNA damages caused by cardiorespiratory endurance and 85%V·O2max all-out exercise by conducting an 8 weeks endurance exercise training for 19 healthy female undergraduates. To achieve the purpose of this study, treadmill running was conducted at the intensity of 70%HRR for 8 weeks. Before and after the training, 85%V·O2max all-out exercise test was conducted. At the 85%V·O2max all-out exercise test, blood samples were taken 5 times respectively before and after the training. With the samples, serum lactate, plasma SOD, and lymphocyte DNA damages were analyzed. The results of the study showed that V·O2max and exercise duration increased significantly(p<.05) after the 8 weeks endurance exercise training. It was also showed that serum lactate caused by high intensity acute exercise decreased significantly at each time of blood taking after the endurance exercise training(p<.05). There were significant differences in the activity of plasma SOD and lymphocyte DNA damages after the endurance exercise training(p<.05). It was also found that there are significant correlations between the changes of V·O2max caused by the 8 weeks endurance exercise training and the changes of plasma SOD, %DNA in the tail and tail moment. Conclusively, 8 weeks regular endurance exercise training can decrease DNA damages by increasing cardiorespiratory endurance and the activity of anti-oxidant and relieving oxidative stress.
안과병원으로 내원한 굴절부등약시 환자의 굴절이상 분포와 임상양상 분석
조수연(Soo-Yeon Cho),김대희(Dae Hee Kim),김응수(Ungsoo Samuel Kim),백승희(Seung-Hee Baek) 대한검안학회 2020 Annals of optometry and contact lens Vol.19 No.1
Purpose: To investigate clinical characteristics and visual prognosis of anisometropic amblyopia patients in a secondary referral eye hospital in Seoul, South Korea. Methods: Medical records of 561 patients with anisometropic amblyopia between 3 and 12 years of age were retrospectively reviewed and 450 patients who followed up ≥ 2 times were included for comprehensive analysis. Amblyopia was defined as best corrected visual acuity difference of ≥ 0.2 logarithm of the minimum angle of resolution (logMAR) between the sound and amblyopic eyes. Anisometropia was defined by ≥ 1 diopter (D) difference in spherical equivalents (SE), or ≥ 1.5 D difference of cylindrical error in any meridian between the eyes. Baseline clinical characteristics, best corrected visual acuity and cycloplegic refraction of both eyes at the first visit were collected. According to the SE of amblyopic eyes, patients were categorized into hyperopia (SE ≥ 1 D), emmetropia (-1 < SE < +1) and myopia groups (SE ≤ -1 D). Treatment success was defined as achieving interocular logMAR visual acuity difference < 0.2. Treatment success rates and time to reach treatment success were compared among the SE groups. Results: Median age of patients was 5.0 years. Median follow-up period was 25.8 months. The proportions of hyperopia, emmetropia and myopia groups were 68.9%, 14.4%, and 16.7%, respectively. Emmetropia group showed anisometropia mostly due to cylindrical error difference between the eyes, rather than SE difference. Treatment success rates were the highest in emmetropia group (95.4%), followed by hyperopia group (85.8%) and then myopia group (77.3%, p = 0.010). Among the patients who fulfilled the success criteria, median time to reach treatment success was the shortest in emmetropia group (3.0 months) followed by hyperopia group (3.6 months) and then myopia group (4.0 months, p < 0.001). Conclusions: Hyperopia was the most common refractive error of the amblyopic eyes in anisometropic amblyopia patients who presented to an eye hospital in Seoul. Treatment success rate was the best in emmetropia group, followed by hyperopia group, and then by myopia group. Time to reach treatment success was the shortest in emmetropia group.