赤血球 protoporphyrin과 鐵分代謝에 關한 硏究

조경환 서울大學校 大學院 1975 국내박사

알곤 이온빔 입사각에 따른 Polyethylene Naphthalate 필름 표면의 자가나노구조화 및 김서림방지/항균특성 분석

조경환 안동대학교 일반대학원 2021 국내석사

Surfaces on which nanostructures are formed are applied in fields requiring changes in physical, chemical, and optical properties of the surface because physical and chemical properties are changed by nano-sized structures. Nanostructures can change their size, shape and chemical structure through various process methods and conditions, and accordingly, antireflection, superhydrophilic/superhydrophobic, and surface enhanced Raman spectroscopy, SERS), and anti-bacterial properties. In particular, in the case of the ion beam process applied in this study, the shape of the nanostructure can be changed by adjusting the ion incidence angle. Due to the recent Corona 19 incident, interest in anti-bacterial/sterilization is increasing, so the research on films with anti-bacterial properties has been focused. Anti-bacterial films are applied to outdoor kiosks, products used outdoors such as vehicle glass, and transparent masks designed due to issues arising when using masks due to the recent increase in mask usage. In addition, in order to prevent the decrease in visibility caused by fogging due to the product characteristics, a study on the surface having anti-fogging properties through super-hydrophilic was conducted, and as a result, a film having both anti-bacterial and anti-fogging properties was produced. Copper, an anti-bacterial material, was deposited to improve the anti-bacterial activity that is insufficient only with nanostructures. In addition, in order to control the nanostructures formed through the ion beam process to produce nanostructures of the desired size and shape, we tried to analyze the causes of the formation of nanostructures. By comparing the result of the simulation and the actual experiment result through the Stopping and Range of Ions in Matter (SRIM) and nanostructure simulation programs, the cause of the different structure was analyzed. In this study, by using the linear ion source, Ar ions are irradiated on the surface of a Polyethylene Naphthalate (PEN) polymer film at an angle of 0, 30, 45, 60, 80° to form a nanostructure, and copper is deposited through magnetron sputtering to increase anti-bacterial activity. The shape and size of nanostructures were measured through SEM, AFM, and SPIP, and anti-fogging and anti-bacterial properties were evaluated using contact angle measurement, anti-fogging test, and JIS Z 2801 test method. As a result, a surface with an anti-bacterial activity of 99.99% and a contact angle 13.5°which is close to superhydrophilicity was formed, and thus a film having anti-fogging and anti-bacterial properties was prepared.

영어담화에 나타난 지시표현의 연구

조경환 부경대학교대학원 2001 국내석사

孝思想을 中心으로 한 韓國傳統倫理와 基督敎倫理

조경환 한신대학 1984 국내석사

횡격막 강화훈련이 발성에 미치는 효과 : 실용보컬을 중심으로

조경환 대구대학교 재활과학대학원 2022 국내석사

본 연구는 최대발성시간(Maximum Phonation Time; MPT)과 바이브레이션(Vibration) 및 음도(Pitch)의 변화를 측정하여 평가함으로써 횡격막 강화훈련이 발성에 미치는 효과를 알아보았다. 연구 대상자는 실용보컬 전공자로 실험집단 19명(남:13, 여:6), 대조집단 14명(남:7, 여:7)을 선정하였다. 연구의 방법은 각 그룹별 최대발성시간, 바이브레이션, 음도를 사전-사후 측정하였다. 실험집단은 횡격막 강화 훈련을 실행하였고 대조집단은 자율적인 훈련을 실행하였다. 최대발성시간의 측정은 소수점 두 자리까지 표시되는 초시계를 사용하였다. 녹음은 휴대용 노트북과 마이크를 이용하여 바이브레이션과 음도를 측정하였다. 훈련과 측정은 총 6회기를 진행하였다. 연구의 결과는 다음과 같다. 첫째, 횡격막의 강화훈련에 따른 두 집단 간 최대발성시간의 변화는 유의한 차이가 있었다. 둘째, 횡격막의 강화훈련에 따른 두 집단 간 바이브레이션의 변화는 유의한 차이가 있었다. 셋째, 횡격막의 강화훈련에 따른 두 집단 간 음도의 변화는 유의한 차이가 있었다. 대조집단의 최대발성시간이 증가한 이유는 실용보컬의 과도한 성대 내전(Adduction)때문이라 보인다. 실험집단의 횡격막 강화훈련으로 인한 바이브레이션의 횟수 증가에 따라 음도의 표준편차도 함께 증가하므로 바이브레이션과 음도는 연관이 되어 보인다. 본 연구의 결과를 토대로 횡격막 강화훈련은 다양한 음성사용자들의 발성훈련을 위해 사용되는 기초 자료가 될 것이며 연구 분석 결과에 따라 후속 연구에 대한 방향을 제안하였다. In this study, the effect of diaphragm strengthening training on vocalization was investigated by measuring and evaluating changes in maximum vocalization time (MPT), vibration, and pitch. The subjects of the study were applied music vocal majors, and 19 people from the experimental group (male: 13, female: 6) and 14 people from the control group (male: 7, female: 7) were selected. As for the method of the study, the maximum phonation time, vibration, and pitch for each group were measured pre- and post-mortem. The experimental group performed diaphragm strengthening training and the control group performed autonomous training. The maximum phonation time was measured using a stopwatch displayed to two decimal places. For recording, vibration and pitch were measured using a portable laptop and microphone. A total of 6 sessions were conducted for training and measurement. The results of the study are as follows. First, there was a significant difference in the change in maximum vocalization time between the two groups according to the reinforcement training of the diaphragm. Second, there was a significant difference in the change in vibration between the two groups according to the reinforcement training of the diaphragm. Third, there was a significant difference in pitch change in the two groups according to the reinforcement training of the diaphragm. The reason for the increase in the maximum phonation time of the control group seems to be due to the excessive adduction of the vocal cords of the applied music vocalist. As the number of vibrations increased due to the diaphragm strengthening training in the experimental group, the standard deviation of the pitch also increased, so the vibration and pitch seemed to be related. Based on the results of this study, the diaphragm strengthening training will be the basic data used for vocal training for various voice users, and the direction for the follow-up study was suggested according to the results of the research analysis.

혐기성 소화를 위한 음식물쓰레기 전처리 방안에 관한 연구

조경환 경상대학교 2002 국내석사

The purpose of this study was to investigate the effective pretreatment of foodwaste for the anaerobic digestion. Considering the foodwaste generation and the anaerobic digester for municipal wastewater sludges, the some pretreatment processes were performed such as the grinding of foodwastes with the addition of water, the mixing with sludges, and the hydrolysis with the addition of NaOH. The results were as followings; 1. As the stage of feasibility test in laboratory scale, the foodwaste grinding using a household garbage disposer was performed with three different water mixing ratios of 1:1, 1:5, and 1:9 as weight base. The physicochemical characteristics of the grinded foodwaste were analyzed and the effective conditions was recommended as the 1:5 mixing ratio of foodwaste and water and the below 8㎜ particle size. 2. And the mixing of foodwaste and municipal wastewater sludge was studied with three different mixing ratios of 1:9, 3:7, and 5:5 as weight base. The physicochemical characteristics of the mixed foodwaste and sludges were analyzed and the effective mixing ratio was recommended as 3:7 of foodwaste and sludge. 3. Finally, the hydrolysis with the addition of NaOH was recommended as the effective pretreatment process and the required hydrolysis time was 10 days.

알코올의존자의 재발에 영향을 주는 요인에 관한 연구

조경환 백석대학교 사회복지대학원 2006 국내석사

면역학적 특성에 따른 Yeast cytochrome c의 구조에 관한 연구

조경환 順天鄕大學校 2000 국내박사

(A)Nonharmonic fourier series on R2

조경환 부산외국어대학교 2003 국내석사

도시환경 자율주행을 위한 무인차량의 지능형 주차 알고리즘 개발

조경환 국민대학교 자동차공학전문대학원 2010 국내석사

무인자율주행차량은 각종 센서를 이용하여 차량제어시스템, 항법시스템, 장애물시스템, 통합시스템의 4가지 서브 시스템으로 구성 되어있다. 본 논문은 비접촉 거리측정 장치인 레이저스캐너를 이용하여 무인자율주행차량의 평행주차 및 직각주차 알고리즘 개발을 목적으로 하였다. 이 알고리즘을 검증하기 위하여 GPS와 차량에 6대의 레이저스캐너를 장착하여 이용하였고, 레이저스캐너를 이용한 위치 계산의 오차를 줄이기 위해 타이어 미끄러짐을 최소로 할 수 있도록 5km/h로 차량의 이동 속도를 제한하였다. 상용차 업계에서는 2003년 도요다가 Prius에 모니터를 이용한 주차보조시스템을 옵션으로 판매하였고, 2004년 Volvo는 S60에 평행자동주차시스템을 탑재하였으며, 2008년 폭스바겐은 평행주차시스템을 일부 차종에 탑재하였다. 국내에서는 2010년 2월 ㈜만도에서 초음파 센서를 이용해 주차공간을 인식한 후 전자제어 조향장치를 제어하여 차량을 주차 공간에 평행 및 직각 주차를 자동으로 주차시키는 운전자보조시스템인 자동주차시스템을 개발하였다. 이와 같은 시스템은 운전초보자 또는 여성운전자의 주차를 보조해주는 수준이었다. 본 연구에서는 운전자 보조시스템이 아닌 무인자율주행차량에서 평행 및 직각주차 알고리즘 개발을 하였다.