흉부 X-Ray 검사시 Low Dose Image Protocol 사용의 유용성에 관한 고찰

채정현(Jeong-hyun Chae),안치복(Chi-bok An),손영목(Yung-mok Son),김윤국(Yoon-kook Kim),박순규(Soon-kyu Park) 대한영상의학기술학회 2018 대한영상의학기술학회 논문지 Vol.2018 No.1

목 적:흉부 X-Ray 검사시, Normal Chest protocol 과 Low Dose Image protocol 영상의 SNR, DAP, 유효선량을 비교함으로써, Low Dose Image protocol의 유용성을 영상의 퀄리티나 환자선량 측면에서 평가하기 위함에 있다. 대상 및 방법: Samsung GC85A를 사용하여 흉부팬 텀을 이용한 Chest PA 검사를 재현하였다. kVp는 110으로 설정하고 mAs는 Auto Exposure Control(AEC) 시스템에 의거하여 총 60장의 영상을 획득한 뒤, 각각 Normal Chest protocol과 Low Dose Image(LDI) protocol을 통하여 Processing을 시행하였다. Image J 프로그램을 통해 각 영상의 SNR을 구하고, GC85A에서 제공하는 DAP를 이용하여 PCXMC 2.0으로 이용하여 유효선량을 계산하였다. 획득한 데이터를 normal protocol과 LDI protocol에 따라 분류한 뒤, 비교 분석하였고, 해당이미지에 대하여 정성적 평가를 시행하였다. 각 그룹의 유의성은 각 그룹의 유의성은 SPSS (version 12.0, SPSS Inc Chicago, IL, USA) 통계 패키지 프로그램을 사용하여 T-test를 시행하여 검증하였으며, 신뢰구간은 95%이다. 결 과:각각의 protocol의 SNR과 DAP, 그리고 유효선 량을 비교 분석한 결과, Normal Chest protocol의 영상들의 SNR이 LDI Chest protocol에서의 영상들 보다 Lung field에서는 10.3%, Rib에서는 11.4%, Heart에 서는 10.9%, Soft skin 에서는 10.9%로 더 높게 측정되었다. 유효선량의 경우, Normal Chest protocol에서의 유효선량 평균은 0.0380mSv, LDI Chest protocol에서의 유효선량 평균은 0.0147로, Normal Chest protocol에서의 유효선량이 LDI Chest protocol의 영상의 유효선량보다 61% 더 높게 측정 되었다. 비록 SNR값이 다소 감소하는 경향이 있었으나, LDI protocol 영상의 정성적 평가 결과가 평균 4.7점인 것으로 볼 때, 진단적 가치가 충분히 있음을 알 수 있었다. 유의성 검증결과 각각의 프로토콜의 부위별 SNR, DAP, mSv 모두 유의한 차이가 있었다(p=0.05). 결 론:Normal protocol과 LDI protocol 영상들의 SNR과 DAP와 유효선량의 비교 분석을 통해, 흉부 X-Ray 검사시 LDI protocol의 사용이 Normal Chest protocol을 사용하는 것보다 영상의 퀄리티적인 측면이나 환자 선량 측면에서 더 유용하다고 사료된다. Purpose:this study has a purpose to evaluate usefulness of Low Dose Image protocol by comparing SNR, DAP and efficient dose of Normal Chest pro-tocol and Low Dose Image protocol in image quality and patient dose. Materials and Methods:We made up Chest PA X-ray exam condition with GC85A of SAMSUNG. kVp is 100, mAs was under the Auto Exposure Control(AEC) system. After acquiring 60 images, we implemented post-processing to each image using Normal protocol and Low Dose image protocol. We measured SNR from Image Jprogram, and DAP from GC86A of SAMSUNG to calculate efficient dose with PCXMC2.0. Acquired data is classified as protocols to compare and analyzed, then we conducted qualitative enaluation. T-test is implemented for significance test with SPSS(version 12.0, SPSS Inc Chicago, IL, USA). Confidence interval is 95%. Result:From result of compare and analysis of SNR, DAP and efficient dose from each protocol, SNR of Normal Chest protocol is higher, 10.3% in lung field, 11.4% in ribs, 10.9% in heart, 10.9% in soft skin, than Low Dose Image protocol. Average efficient dose of Low Dose protocol was 0.0147 mSv, and 0.0380 mSv for Normal. Efficient dose of Normal protocol measured higher than Low Dose protocol as 61%. Although SNR value decreased, images of Low Dose protocol are qualified for diagnosis, cause the result of qualitative evaluation was 4.7 in average. SNR, DAP and mSv of each protocol has significance difference(p=0.05). Conclusion:With comparison and analysis of SNR, DAP and efficient dose of Normal protocol and Low Dose protocol, it is considered that using Low Dose Image protocol is more pertinent in image quality and patient dose than using Normal image protocol.

흉부 X-ray 검사 시 DEI 값에 따른 적정 관전압에 관한 고찰

채정현(Jeong-hyun, Chae),심지나(Ji-na, Sim),정지상(Ji-sang, Jung),한영수(Yung-soo, Han),진덕은(Duk-eun, Jin),강성호(Sung-ho, Kang),임재식(Jae-sik, Lim) 대한영상의학기술학회 2014 대한영상의학기술학회 논문지 Vol.2014 No.1

목 적 : 흉부 X-ray 검사 시, DR 시스템에 적절한 유효 Detector Exposure Index (DEI) 범위 내의 영상의 Dose Area Product (DAP)값과 유효선량을 비교함으로써, high kVp 사용의 적합성을 영상의 퀄리티나 환자선량 측면에서 평가하기 위함에 있다. 대상 및 방법 : GE definium 8000을 사용하여 흉부팬텀을 이용한 Chest PA 검사를 재현하였다. kVp range는 60~130 kVp로 정하였다. mAs range는 앞의 정한 kVp에 따라 Auto Exposure Control (AEC) 시스템에 의거하여 60kVp에서는 40mAs, 130kVp에서는 2.5mAs로 정하였고 mAs range는 2.5mAs에서, 3.2mAs, 4.0mAs, 5.0mAs, 6.3mAs, 8.0mAs, 10mAs, 12.5mAs, 16mAs, 20mAs, 25mAs, 32mAs, 40mAs로 설정하였다. 위의 kVp 조건에 따라, 각각의 mAs로 총 104번 을 exposure한 뒤, 세브란스 선량관리 시스템으로 전송된 영상의 DEI와 DAP를 획득할 수 있었다. 획득한 영상을 유효한 DEI 범위의 영상들(0.2-0.6 : 정상군)과 DEI 0.2 이하, DEI 0,6 이상인 영상들 을 각각 분류하고 DAP을 이용하여 a PC-Based Monte Carlo Program 2.0 (PCXMC)을 통해 유효 선량을 계산하였다. 각각의 측정한 데이터를 DEI기준, DAP기준, 유효선량의 기준으로 분류한 후, DR 시스템에서 Chest PA 검사 시 적절한 kVp 범위를 분석하였다. 각 그룹의 유의성은 SPSS(version 12.0, SPSS Inc Chicago, IL, USA) 통계 패키지 프로그램을 사용하여 kruskal-wallis test와 사후검정으로 mann -whitney test를 시행하여 검증 하였으며 검증에 사용된 신뢰구 간은 95 %이다.    결 과 : 위의 실험을 통해 얻은 유효한 DEI 범위(0.2-0.6)에 포함된 영상의 평균 kVp는 75.29 kVp 이고 평균  mAs는 8.58 mAs, 평균 DAP는 1.73 mGy·cm², 유효선량은 0.018 mSv 이었다. 유효선 량별로 수집한 군에서 최저의 유효선량인 0.011449 mSv가 측정된 조건은 70kV, 5mAs, DAP 1.06mGy·cm²,이었다. 실측값 DAP에 따른 군에서는 최저 DAP 인 0.885 mGy·cm²에서 조건은 90kV, 2.5mAs, 0.013mSv이 측정되었다. 유의성 검증 결과, 유효 DEI 범위 내의 유효선량에서 유의한 차 이(p<0.05)가 있었고, 전체 DEI 그룹에서 대해서는 0.2 이하 범위와 0.2이상 0.6 이하의 범위, 0.6이상의 범위의 유효선량과 DAP에서 모두 유의한 차이가 있었다.(p<0.05)  결 론 : 각각의 DEI, DAP, 유효선량 기준으로 분류된 데이터를 통해 현재 사용되고 있는 흉부 검사 시 high kVP기법은 환자 피폭적인 측면과 영상의 퀄리티적인 측면에서 재고할 필요성이 있다고 사료된다. Purp os e : This study is to evaluate the suitability of the use of high kVp technique for Chest PA examination in DR system by comparing with Dose Area Product and effective dose of chest images in efficient Detector Exposure Index(DEI) range.    Materials and Methods :  We set up situation of Chest PA examination with GE definium 8000. kVp range is 60~130 kVp. Range of mAs is 40 mAs at 60kVp, 2.5mAs at 130kVp  through Auto Exposure Control system(AEC) in accordance with kVp range we set, then we set up mAs range from 2.5mAs, 3.2mAs, 4.0mAs, 5.0mAs, 6.3mAs, 8.0mAs, 10mAs, 12.5mAs, 16mAs, 20mAs, 25mAs, 32mAs to 40mAs. We exposured 104 times as the kVp condition we set, then all images are sent to the Severance Dose management system which we can acquire DEI and DAP data. We classified acquired images into several DEI groups–under 0.2, between 0.2 and 0.6, over 0.6, then calculated Effective Dose with DAP by using a PC-Based Monte Carlo Program 2.0(PCXMC). After classifying acquired data into 3 groups according to DEI, DAP and effective dose, we analyzed suitable kVp range for Chest PA examination in DR system. SPSS(version 12.0, SPSS Inc Chicago, IL, USA) is used for statistical significance, which is Kruskal-Wallis test and Mann-Whitney test to each group. Confidence interval is 95%.  Res ult : Average kVp of image in efficient DEI range from the experiment is 75.29 kVp, mAs is 8.58 mAs, DAP is 1.73 mGy·cm² and effective dose is 0.018 mSv. The condition which 0.011449 mSv is acquired as the lowest effective dose is 70 kVp, 5mAs, DAP 1.06mGy·cm² in groups classified with effective dose. Another condition which 0.885mGy·cm² is acquired as the lowest DAP is 90kV, 2.5mAs, and Its effective dose is 0.013mSv. As a result of statistic significance test, there is significance difference in effective dose of the efficient DEI range group(p<0.05) and significance difference is found in whole DEI groups of under 0.2, between 0.2 and 0.6, over 0.6(p<0.05)  Conc lus ion : According to each classified data with DEI, DAP, Effective dose, high kVp technique for Chest PA examination which is currently used is need to be reconsidered in patient exposure and image quality.

가정과교육의 정체성 탐색: 이미지와 성격을 중심으로

박이정 ( Mi Jeong Park ),채정현 ( Jung Hyun Chae ) 대한가정학회 2007 Human Ecology Research(HER) Vol.45 No.4

대한가정학회지 연구 동향 및 공저자 네트워크 분석: 2010∼2022년 게재 논문을 중심으로

박미정 ( Mi Jeong Park ),채정현 ( Jung Hyun Chae ),한주 ( Ju Han ) 대한가정학회 2024 Human Ecology Research(HER) Vol.62 No.1

The purpose of this study was to analyze the research trends and co-author networks of academic articles published in the Journal of the Korean Home Economics Association from 2010 to 2022. The network analysis was conducted using Excel and NetMiner 4.4, and the results were as follows. First, the number of published articles has been maintained at around 40 per year since 2019. By field, most articles were published in the field of child studies and family studies, followed by consumer studies, home management, clothing studies, home economics education, food and nutrition, and housing. The research methods were primarily quantitative (71.61%). Second, the most common keywords in the titles of the published articles were “influence” and “relationship”, with “influence”, “consumer”, “mediating effect”, “parent”, and “control” identified as influential keywords. Third, the published articles were categorized into nine topics based on subject matter, while the number of topic types varied by year. Fourth, the total number of authors of the 627 articles was 712, with 1.92 authors per article, as well as the number of authors who published two or fewer articles accounted for 85.5% of the total. By institution, Yonsei University had the highest number of authors and the highest number of published articles, while Korea National Open University played a leading role in the network of co-authors by institution. This study is significant in providing basic data for the future development of the Korean Home Economics Association and the field of home economics.

4-10 Hz 빛과 소리자극 후 단기기억력 및 자율신경심장기능의 변화 - 예비연구 -

이승환,김진환,박중규,이경욱,양대현,홍근영,채정호,Lee, Seung-Hwan,Kim, Jin-Hwan,Park, Joong-Kyu,Lee, Kyung-Uk,Yang, Dae-Hyun,Hong, Keun-Young,Chae, Jeong-Ho 대한수면의학회 2004 수면·정신생리 Vol.11 No.1

목 적 : 본 연구는 $4{\sim}10\;Hz$의 빛과 소리자극이 인체의 단기기억력 및 긴장이완에 어떠한 영향을 주는지 관찰하기 위한 예비연구로 시행되었다. 방법:총 10명의 대상을 무작위로 동기화된 파형의 빛과 소리를 가한 처치군(R 군)과 동기화되지 않은 무작위 파형의 빛과 소리를 가한 허위군(P 군)으로 분류하고, 하루 15분씩 5일간 빛과 소리 자극을 가하였다. 단기기억력을 측정하기위한 척도, 불안 척도 그리고 자율신경심장 기능 검사 등을 시행하였다. 2일간 휴식 후 R군과 P군을 교차하여 5일간 같은 실험을 반복하였다. 결 과:R군에서 빛과 소리자극 1회 적용 후 단기기억력의 유의미한 향상이 관찰되었다. 자율신경심장기능 검사에서는 R군에서 유의미한 이완 효과가 관찰되었다. 결 론:이 연구 $4{\sim}10\;Hz$의 빛과 소리자극이 단기기억 및 긴장이완과 연관됨을 암시한다. 향후 실험대상수를 늘려 예비연구결과를 확인함이 필요하다. Objectives: Sound and light (SL) stimulation has been used as a method to induce some useful mental states in the fields of psychology and psychiatry. It is believed that sound and light entrainment device (SLED) has some specific effects through synchronization of EEG in patients who use it. Theta frequency is believed to stimulate deep relaxation and short term memory processing. This study was conducted to evaluate if 4-10 Hz SL stimulation can induce relaxation and improve short term memory function. Methods: Ten medical students with no medical or psychiatric problems participated in this study. Subjects were randomly divided into two groups. One group was applied with real SLED was applied to one group (R group) and pseudo SLED to the other group (P group). The two groups were exposed to SL stimulation with SLED 15 minutes a day for 5 days, and after two days rest the two groups were switched over. The Korean Wechsler Adult Intelligence Scale (K-WAIS), Academic Motivation Tests (AMT), Test Anxiety Scale (TAS), Korean Auditory Verbal Learning Test (K-AVLT), and digit span were used to evaluate short term memory. Spielberger's State-Trait anxiety inventory and heart rate variability (HRV) test were used to evaluate degree of relaxation. Results: Compared with S group, R group showed a significant improvement in K-AVLT and digit span after a single application of SL stimulation. But 5-day long application did not reveal any differences between the two groups. A significant change in HRV was observed in 5-day long application of SL stimulation after being switched over to other SLED. Conclusion: This pilot study suggests that 4-10 Hz SL stimulation has some positive influences on short term memory and relaxation.

문제중심학습법을 적용한 중학교 가정과 융합교육프로그램 개발과 실행 효과: 지속가능한 식생활을 중심으로

윤호정(Yun, Ho Jeong),허영선(Heo, Young Sun),채정현(Chae, Jung Hyun) 한국가정과교육학회 2020 한국가정과교육학회지 Vol.32 No.4

본 연구의 목적은 문제중심학습법을 적용한 가정과 융합교육프로그램을 중학교 식생활 단원을 중심으로 개발하고 실행하여이 수업이 중학생들의 문제해결력에 미치는 효과를 검증하는 데 있다. 이를 위해 타교과와의 연계성을 살펴 ‘지속가능한 삶’을주제로 설정하여 핵심질문을 ‘식품자원의 환경과의 관계, 개인차원의 영향, 해결방법은 무엇인가?로 설정하고 문제와 8차시의수업을 개발하였다. 문제중심학습법을 적용한 가정과 융합교육프로그램을 실시한 결과, 평균점수가 3.54, 사후 평균점수가 3.96으로 통계적으로 문제해결능력(p<.001)에 유의미한 차이를 보였다. 문제해결능력의 능력요소인 원인분석, 대안개발, 계획/실행,수행평가에서 유의미한 차이가 있었으나, 문제명료화에서 유의미한 차이가 없었다. 따라서 문제중심학습법을 적용한 가정과융합교육프로그램은 문제해결능력에 효과적인 수업이라는 것을 확인하였다. The purpose of this study was to develop and implement a home economics convergence education program applyingproblem-based learning method focusing on the middle school food and nutrition life unit, and verify the effect of this classon the problem-solving ability of students. For this, the study set up the theme of ‘sustainable life’ by examining the relationshipwith other subjects, and set the key question as ‘what is the relationship with the environment of food resources, the influenceof individual level, and the solution method?’ was postulated. And developed the problem and the total of 8 classes. As a resultof conducting the convergence education program with home economics applying problem-based learning method, the pre-testand post-test scores were 3,54 and 3.96, respectively, which showed a significant increase in problem-solving ability (p<.001). There were significant differences in the dimensions of problem-solving ability, except for problem clarification. Therefore, itwas confirmed that the home economics and convergence education program applying problem-based learning method is aneffective class for improving students’ problem-solving ability.

얼굴 인식의 발달학적 관점

채정호,양대현,이경욱,박원명 한국의학사 2004 診斷과治療 Vol.24 No.2

실천적 추론 가정과 수업이 중학생의 도덕성에 미치는 효과

채정현,유태명,박미정,이지연 대한가정학회 2003 Human Ecology Research(HER) Vol.41 No.12

The purpose of thii study was to develop lesson plans and teaching materials applying practical reasoning instruction for the 7th home economics cuniculum content, and to test the effects of practical reasoning instruction on morality of middle school students. This study is a quasiaperimental research with a pretest-postkt &qn. Practical reasoning instruction for experimental group and traditionally lecture oriented insbuction for comparison group were input, and tested the statistical differences between two groups before and after the treatment. The subjects for this study were 8th grade students of a mi& school located in Kwangiu city. Two classes of 76 students homogeneous in characteristics and academic record for each experimental and comparison group were assigned. lnstnunent used for this study was a revised moral indicator, that was developed by KEDI(2001). Spss/wi for 10.0 statistics program was used for analysis of data. ANCOVA was done for testing statistical difference been pretest and posttest of experiment group and comparison group. Result of study which showed statistically significant difference between groups were: 1. V i e of responsibility for words and deeds (from 3.22 to 3.61 for experimental group and from 3.27 to 3.26 for comparison group) in domain of responsibility and cooperation, and virtue of punduality (from 3.59 to 3.76 for experimental group and from 3.41 to 3.28 for comparison group) in domain of trustworthiness, 2. V i e of conversation etiquette (from 3.47 to 3.67 for experimental group and from 3.28 to 3.31 for comparison group) in domain of caring for others, 3. Virtue of forgiveness other s mistakes (from 3.32 to 3.65 for experimental group and from 3.33 to 3.25 for comparison group) in domain of kindness, concession, forgiveness, and virtue of volunteering activity from 2.89 to 3.71 for experimental group and from 3.36 to 3.45 for comparison group) in domain of compassion and service, 4. Virtue of equip the convenient facility for handicapped (from 4.19 to 4.29 for experimental group and from 4.17 to 3.91 for comparison group) in domain of equality and human rights, virtue of recovering selfness for own community (from 2.34 to 2.79 for experimental group and from 2.14 to 2.29 for comparison group), virtue of opposing way of accomplishing purpose by all means (from 3.27 to 3.31 for experimental group and from 3.47 to 3.05 for comparison group), virtue of opposing election of considering aquaintance (from 3.35 to 3.56 for experimental group and from 3.12 to 3.14 for comparison group) in domain of fairness, and virtue of eradication of military force or violence among countries (from 3.49 to 3.57 for experimental group and from 3.38 to 3.05 for comparison group) in domain of love for humanity. The morality of experimental group was improved more than that of comparison group in all of above items. From the results of thii study, following conclusion was drawn. Practical reasoning insbudion in home economics is effective in raising students virtue and value of responsibility in words and deeds, trustworthiness in punctuality, courtesy of not intempting conversation, forgiveness of other s mistakes, volunteering activity, equity for handicapped, fairness opposing selfness for own community, fairness opposing way of accomplishing purpose by all means, fairness opposing election of considering acquaintance, and love for humanity opposing war.

ICT를 활용한 가정과 Web 기반 문제해결 학습환경의 개발

박미정,채정현 대한가정학회 2002 Family and Environment Research Vol.40 No.7

The objective of this study was to develop a Web based learning environment for Home Economics Education(HEE) using ICT (Information & Communication Technology). For the study, the following procedures were performed: 1) the review of literature, 2) development of learning environment and questionnaires based on Web for HEE using ICT. The Web based learning environment was investigated and designed, and evaluated by the users. The problems indicated through the evaluation were revised and complemented. In addition, 13 sets of learning questionnaires, which were verified using the same procedure as above, were developed to provide problem solving ability through the Web based learning environment. Learning environment based on the Web entitled "Together with the classroom of HEE" has a main menu, which is composed of rooms for HEE, students, teachers, various topics, recommendation sites, chatting, and e-mail. A room for HEE, in which learning activity mainly occurs by following the sequences of learning procedures, includes other sub-rooms for the guidance of learning, discussion, directories for reference, question and answer, submission of homework, evaluation, and an encyclopedia. Therefore, this study implicates: 1) achievement of learning environment using the ICT mainly made by students who solve problems closely related to daily life, 2) development of practical learning questionnaires fitted in the present state, 3) preparation for 7th curriculum. Finally, from this study, I suggested that further studies are needed to develop models for learning, interaction between students and teachers, and the learning materials under the Web based learning environment.