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계절적 라돈농도 변화 및 토양기원 실내라돈과 토양내 라돈농도의 상관성 분석 -단독주택 사례연구-
조주현,김영희,Cho, Ju-Hyun,Kim, Younghee 한국지하수토양환경학회 2017 지하수토양환경 Vol.22 No.5
In this study, the variation of indoor and soil radon concentrations were measured at a test bed (detached house), and correlation analysis was performed using linear regression. The results showed that the average concentration of indoor radon was increased by about 20% when the heater was operated in the house, but it was decreased by 15% when the ventilation system was on. In the changes of seasonal radon concentrations, soil and indoor radon concentrations in winter were higher than in summer. Statistical analysis showed a weak correlation between the soil radon and indoor radon, but the correlation (R=0.852, $R^2=0.726$) was relatively high at exhaust condition in the winter. It is difficult to extrapolate the results of the study to the general cases because radon distribution is highly site-specific, but the result of this study could be used as a reference for radon management and reduction of detached house in the future investigations.
SOI 기판을 이용한 Thermal Probe 어레이 제작 및 특성 평가
조주현,나기열,박근형,이재봉,김영석,Cho, Ju-Hyun,Na, Kee-Yeol,Park, Keun-Hyung,Lee, Jae-Bong,Kim, Yeong-Seuk 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.11
This paper reports the fabrication and characterization of $5\;\times\;5$ thermal cantilever array for nano-scaled memory device application. The $5\;\times\;5$ thermal cantilever array with integrated tip heater has been fabricated with MEMS technology on SOI wafer using 7 photo masking steps. All single-level cantilevers have a diode in order to eliminate any electrical cross-talk between adjacent tips. Electrical measurements of fabricated thermal cantilever away show its own thermal heating mechanism. Thermal heating is demonstrated by the reflow of coated photoresist on the cantilever array surface.
조주현,전학훈,강봉수,김승기,Ju Hyun Cho,Hak Hoon Jun,Bong Su Kang,Seung Ki Kim 대한갑상선-내분비외과학회 2014 The Koreran journal of Endocrine Surgery Vol.14 No.4
Purpose: Thyroglossal duct cyst (TGDC) is known to be the most common midline neck mass in children, but the adult population still has this abnormality. The most common symptom of TGDC is a simple neck mass, and differential diagnosis among other abnormalities is important. The aim of this study is to perform a retrospective view of TGDC in order to describe any differences in clinical features, diagnostic tools, treatment, and outcomes in children and adults who underwent surgery in a single institution, and to determine its clinical implications. Methods: We performed a retrospective chart review on 75 pathologically diagnosed TGDC patients from 1995 to 2013 who were divided into two groups: children (≤18 years) and adults. Comparison analysis was performed for age, sex, site and location of cyst, size, diagnostic tool, surgical method, and postoperative outcome. Results: Our study showed frequent occurrence of TGDC in adults. There was no significant sex, site, or location difference in the occurrence of TGDC in children and adults, however, the size of cyst in adults was larger than that in children (mean, 2.80 cm vs 2.15 cm) (P< 0.001). Four patients (5.3%) had postoperative recurrence of TGDC, and Sistrunk operation showed lower recurrence rate than excision (3.1% vs 18.2%) (P<0.040). Two malignancy cases were identified postoperatively in adults. Conclusion: Particularly in adults, the possibility of carcinoma would make it important to perform fine-needle aspiration for differential diagnosis. Sistrunk procedure will remain the treatment of choice for most TGDC patients considering recurrence risk.
조주현,김두헌,최시영,강충일,문갑영,Cho, Chu-Hyun,Kim, Doo-Hun,Choi, Si-Young,Kang, Chung-Il,Moon, Gap-Young 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.10
Zn wires have been electrically exploded in methanol or distilled water using the pulsed power technologies. The nanopowders produced by the explosions have been observed by using SEM and TEM, and analyzed its phase by using EDS and XRD. The nanopowders produced in distilled water showed ZnO phase only. On the other hands, the nanopowder produced in methanol showed mixed phases with Zn and ZnO. The HR-TEM images of the nanopowders produced in methanol showed that the some particles have been coated with carbon like materials. It is considered that the carbon coatings could be depended on the positions of the particles during the plasma state formed by explosion.
조주현,강충일,하윤철,진윤식,이경자,이창규,Cho, Chu-Hyun,Kang, Chung-Il,Ha, Yoon-Cheol,Jin, Yun-Sik,Lee, Kyung-Ja,Rhee, Chang-Kyu 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.9
Nickel wires of 0.8 mm in diameter and 80 mm in length were electrically exploded in liquid media such as water, ethyl alcohol. The distribution of particle sizes was broad from a few micrometers to tens of nanometer. It was identified that the particles could be classified according to its sizes by using centrifugal separator. The powder prepared in distilled water showed mainly pure metallic Ni phase although a little oxide phase was observed. The powders prepared in ethyl alcohol showed complicated unknown phases, which is attributed to the compound of carbon in the organic liquid. This unknown phase was turned to pure metallic Ni phase after heat treatment.
조주현(Cho Joo hyun) 한국도덕윤리과교육학회 2015 도덕윤리과교육 Vol.- No.49
그간 도덕과 교육의 시민성 논의는 자유주의와 공동체주의라는 두 가지 이론에 국한되어 전개되어 온 것이 사실이다. 본 연구는 도덕과 교육의 정치철학적 근거로서 공화주의 시민성 이 유의미하게 기여할 수 있다는 점에 착안하여, 다음과 같은 작업을 하고자 한다. 먼저 공화 주의 시민성의 개념과 구성요소에 대해 간략하게 살펴보도록 한다. 이를 바탕으로 공화주의 시민성의 내용이 중학교 『도덕』 교과서에 제대로 반영되어 있는지 분석한다. 이를 통해 본 논문에서는 공화주의 시민성의 내용이 중학교 『도덕』 교과서에 거의 반영되어 있지 않다는 점을 밝히고, 그에 대한 개선방향을 구체적으로 제시하고자 한다. 더불어 본 논문의 제안이 차기 교육과정 개정 시 적극적으로 반영될 필요가 있음을 강조하고자 한다. It is true that most researchers in moral education have been paying attention to only two types of theory, liberalism and communitarianism regarding citizenship. Noticing that republican citizenship has some important implications for civic education of moral subject education, this study is aimed to carry out the following: First, after a brief view of the structure of republicanism, we analyze moral education textbooks used in middle schools in Korea based on this. Then, It is found that there is a lack of the contents of republican citizenship such as public good, civic virtue, republican freedom. Through this, this study considers the possibility of incorporating republican citizenship into the next moral subject curriculum. This study also suggests a further need for a series of studies on republican citizenship.