치과 방사선 발생기의 성능평가에 관한 연구

정재은,정재호,강희두,이종웅,나극환,Jung, Jae-Eun,Jung, Jae-Ho,Kang, Hee-Doo,Lee, Jong-Woong,Ra, Keuk-Hwan 대한디지털의료영상학회 2009 대한디지털의료영상학회논문지 Vol.11 No.2

I think this will be valuable reference for assuring consistency and homogeneity of clarity and managing dental radiation equipment by experimentation of dental radiation equipment permanent which based on KS C IEC 61223-3-4 standard and KS C IEC 61223-2-7. Put a dental radiation generator and experiment equipment as source and film(sensor) length within 30 em, place the step-wedge above the film(sensor). Tie up tube voltage 60 kVp, tube current 7 mA and then get an each image through CCD sensor and film by changing the exposure time as 0.12sec, 0.25sec, 0.4sec. Repeat the test 5times as a same method. Measure the concentration of each stage of film image, which gained by experiment, using photometer. And the image that gained by CCD sensor, analyze the pixel value's change by using image J, which is analyzing image program provided by NIH(National Institutes of Health). In case of film, while 0.12sec and 0.25sec show regular rising pattern of density gap as exposure time's increase, 0.4sec shows low rather than 0.12sec and 0.25sec. In case of CCD sensor density test, the result shows opposite pattern of film. This makes me think that pixels of CCD's sensor can have 0~255 value but it becomes saturation if the value is over 255. The way that getting clear reception during decreasing human's exposed radiation is one of maintaining an equipment as a best condition. So we should keeping a dental radiation equipment's condition steadily through cyclic permanent test after factor examination. Even digital equipment doesn't maintain a permanent, it can maintain a clarity by post processing of image so that hard to set it as standard of permanent test. Therefore it would be more increase the accuracy that compare a film as standard image. Thus I consider it will be an important measurement to care for dental radiation equipment and warrant homogeneity, consistency of dental image's clarity through comparing pattern which is the result from factor test against cyclic permanent test.

로봇 수술을 위한 3차원 구조계산의 필요성 조사

정재은,최석윤,Jung, Jae-Eun,Choi, Seok-Yoon 대한디지털의료영상학회 2009 대한디지털의료영상학회논문지 Vol.11 No.1

Geometry calculation Using Abdominal internal organ image from traditional laparoscopy or robotic surgery system we can make depth informations through measured 3D structure informations is very helpful to doctors, depth information is mare useful then others that use traditional laparoscopy or robotic surgery system to many doctors. however, traditional method are incomplete. less experienced doctors make much mare prohability of mistake. Hence, 3D information of organ is very helpful to the less experienced doctors. it will be greate role of reducing medical accidents and surgical time. We can get 3D informations using geometrical calculation method in robotic surgical system. also suggested method is needed in traditional surgical method without the need to create a new system, finally, We can get 3D information from traditional system without any new system, it take advantage in cost and create high efficiency. mare information will provided to many doctors.

저탄소 방청 보수모르타르 개발을 위한 기초연구

정재은,양근혁,고정완,윤인구,Jung, Jae-Eun,Yang, Keun-Hyeok,Go, Jeung-Wan,Yun, In-Gu 한국건설순환자원학회 2014 한국건설순환자원학회 논문집 Vol.2 No.2

이 연구는 플라이애쉬와 고로슬래그를 치환한 방청 폴리머 보수모르타르의 개발을 위한 기초실험이다. 주요변수는 폴리머 수지 치환율, GGBS와 FA 치환율 및 방청제 치환율이다. 주요 측정항목은 초기슬럼프, 재령별 압축강도, 재령 28일 휨 강도, 건조수축 변형률이다. 실험 결과 모르타르의 압축강도 발현을 고려하였을 때 FA와 GGBS의 적정 치환율은 각각 10%와 20%로 추천될 수 있었다. 또한 방청체 치환은 모르타르의 압축강도를 감소시키는데, 적정 방청제 치환율은 1.5% 이하가 고려될 수 있었다. 한편 모르타르의 휨 강도는 ACI 318-11에서 제시하는 값인 $0.63{\sqrt{f_{ck}}}$보다 컸으며, 건조수축 변형률도 재령 10일 이후에는 ACI 209 예측값보다 낮았다. The present study prepared 13 mixes to examine fundamental mixture proportions of corrosion inhibitor repair mortars. The mortar mixes were classified into three groups according to the selected test variables which are the substitution level of polymer for Group 1, ground granulated blast-furnace slag (GGBS) and fly ash (FA) for Group 2, and corrosion inhibitor for Group 3. Based on the test results, the optimum substitution levels of GGBS and FA could be recommended as 10% and 20%, respectively, though 1-day strength of mortar significantly decreased with their substitution. Furthermore, the appropriate substitution level of corrosion inhibitor was considered to be less than 1.5%. The flexural strength of mortar tested was higher than the predictions obtained from ACI 318-11 equation. The shrinkage strain of mortar was also conservative after an age of around 10 days compared with the predictions of ACI 209.

대구경북 서비스 콘텐츠 활성화를 위한 애니메이션 콘텐츠가 학습성과의 연관관계 연구: 개인정보보안을 중심으로

정재은,Jung, Jason J. 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.2

본 연구는 이러닝을 실시하는데 있어 플래시와 같은 애니메이션 콘텐츠가 미치는 영향에 대하여 알아보았다. 보다 구체적으로 애니메이션 콘텐츠의 어떠한 속성들이 개인정보보안 관련 이러닝 학습에 긍정적인 영향을 미치는지 알아보고자 하였다. 그 결과 플래시 애니메이션의 속성인 캐릭터와 스토리가 학습자들의 이러닝 학습 효과를 높이는데 긍정적인 영향을 미치는 것을 알 수 있었다. As information and communication technologies (ICTs) has been developed, it is getting more important for internet users to consider many security issues (e.g., privacy protection). In this paper we claims that animation contents make a positive influence on teaching such computer securities, and investigate what features of animation contents will be the most important relationships with performance of the teaching process. Once we have obtained the survey results from students, two main features (i.e., characters and plots) of the animation contents have positively influenced the performance of e-learning systems.

어린이집 평가인증 제도에 대한 보육교사의 인식과 실태 분석

정재은(Eun-Jung Jung),정은정(Jae-Eun Jung) 중앙대학교 한국교육문제연구소 2012 한국교육문제연구 Vol.30 No.1

본 연구의 목적은 어린이집 평가인증 제도에 대한 보육교사의 인식과 실태를 분석하여 평가인증 제도의 효율적인 수행과 성공적인 정착을 위한 방안을 모색하는 데 있다. 어린이집 평가인증 제도에 대한 보육교사의 인식과 실태를 분석하기 위한 설문지를 개발한 후 연구자료를 수집하였다. 개발된 설문지는 평가인증 제도에 대한 보육교사의 인식, 평가인증 준비과정에 대한 보육교사의 인식 및 실태, 평가인증 지표(7개 영역)에 대한 보육교사의 인식, 평가인증 사후관리에 대한 보육교사의 인식의 4개 영역으로 구분하여 총 36문항으로 구성하였다. 연구대상은 S시에 소재한 어린이집 중 2005년 3월부터 2011년 6월까지 평가인증을 통과한 어린이집의 보육교사 154명이었으며, 수집된 자료는 χ2-검증을 실시하여 분석하였다. 연구결과, 평가인증 제도에 대한 인식, 평가인증 준비과정에 대한 인식 및 실태, 평가인증 지표(7개 영역)에 대한 인식, 평가인증 사후관리에 대한 인식은 보육교사가 재직하고 있는 어린이집 유형에 따라 부분적으로 유의한 차이가 있는 것으로 나타났다. The purpose of this study was to analyze the status and childcare teachers' awareness of the Childcare Center Accreditation System to implement and settle down the system successfully. A questionnaire was developed based on prior literature, research and arrangements with professors and childcare teachers. The questionnaire is composed of 4 items of 36 questions related to 'general awareness of the Childcare Center Accreditation System', 'the preparatory process of the Childcare Center Accreditation System','7 indicators of the Childcare Center Accreditation System', and 'post management of the Childcare Center Accreditation System'. The Subjects used in this study were 154 childcare teachers who work for childcare center passed the Accreditation System from March, 2005 to June, 2011 in S province. Data analysis was conducted by χ2-test. The results of this study indicated that there were partially significant differences among childcare teachers according to the types of childcare center.

FEM 해석에 의한 자동차 A/C controller의 고장 메커니즘 분석

정재은(Jae-Eun Jeong),김태환(Tae-Hwan Kim),정창용(Chang-Yong Jung),이정윤(Jung-Yoon Lee),오재응(Jae-Eung Oh) 한국정밀공학회 2011 한국정밀공학회 학술발표대회 논문집 Vol.2011 No.6월

꽃눈의 발아 -만개 예측에 근거한 포도 상해경보시스템

정재은 ( J. E. Jung ),윤진일 ( J. I. Yun ) 한국농림기상학회 2005 학술발표논문집 Vol.2005 No.2

남성(男性) 체형별(體型別) 재킷 길 원형(原型)(Block) 연구(硏究)

정재은 ( Jae Eun Jung ) 한국패션비즈니스학회 2006 패션 비즈니스 Vol.10 No.1

The purpose of this study were to provide dress forms and men`s jacket blocks based on the analysis of their somatotype. As the result of the previous research, based on 1290 males of 20 to 54 year-old, the shapes of adult male were 20 and each body shape was classified by size factor, height and chest girth and master size was selected considering appearance frequency. Somatotype YS(master size: height 170cm, chest girth 91cm) and HD1(master size: height 170cm, chest girth 94cm) were selected to develop dress forms and men`s jacket block in the study. The procedure and results were follows; 1. The dress forms of somatotype YS and HD1 were provide base on means of 61 body measurements and cross sections of shoulder, chest, waist, hip of subjects belong to each somatotype. 2. New men`s jacket blocks of somatotype YS and HD1 were developed based on the body surface extracted by draping and the result of comparative investigation on the conventional jacket patterns by wearing test. Also the drafting methods of new men`s jacket blocks were provided. 3. Wearing test by the sensory evaluation showed that the developed jacket blocks were estimated more highly than existing patterns.

Calibration Examination of Dose Area Product Meters using X-ray

정재은(Jae Eun Jung),정홍문(Hong Moon Jung),원도연(Do Yeon Won),권대철(Dae Cheol Kweon) 한국방사선학회 2017 한국방사선학회 논문지 Vol.11 No.1

엑스선을 이용한 방사선검사에서 전리함 방식의 면적선량계를 이용하여 흡수선량과 면적선량을 측정하고, 교정계수를 측정하였다. 간접선량측정법은 엑스선발생장치의 방사부에 검출기를 설치, 측정치를 조사부위에서의 선량으로 산출하였다. 교정계수를 산출하기 위해 사용된 기기는 엑스선 발생장치로 (DK-550R/F, DongKang Medical Co. Ltd., Seoul, Korea)를 이용하였고, 교정계수를 위한 교정방법은 면적선량계와 교정선량계를 연결하고 관전압 70 kV, 관전류 500 mA, 0.158 sec로 79 mAs 조건을 이용하였다. 면적선량계 (PD –8100, Toreck Co. Ltd. Japan)을 이용하였고, 기준선량계는 반도체검출기 (DOSIMAX plus A, Scanditronix, Wellhöfer, Germany)를 이용하였다. 면적선량계를 전리함의 다중조리개 전면에 설치 후 정확한 선량 측정을 위해 기준선량계를 이용하여 선량계의 교정계수를 구하였다. 실험적으로 노출하여 측정된 값과 교정선량계에서 나온 값에 각각의 교정계수를 곱하여 산출하였다. 교정계수는 1.045로 산출되었다. 전리함 방식의 면적선량계에서 관전압에 따른 교정계수를 산출하기 위해 흡수선량과 면적선량을 구하여 교정상수를 산출하였다. 면적선량계의 교정계수를 구하여 정확한 면적선량을 산출하여야 한다. We measured the absorbed dose and the area dose using an ionization chamber type of area dose product (DAP) meter and measured the calibration factor in the X-ray examination. In the indirect dose measurement method, the detector was installed in the radiation part of the X-ray equipment, and the measured value was calculated as the dose at the exposure part. The instrument used to calculate the calibration factor was an X-ray equipment (DK-550R / F, DongKang Medical Co., Ltd., Seoul, Korea). The calibration method for the calibration factor was to connect the DAP meter (PD-8100, Toreck Co. Ltd., Japan) to the calibration dosimeter tube voltage of 70 kV, tube current of 500 mA, 0.158 sec. The reference dosimeter used a semiconductor (DOSIMAX plus A, Scanditronix, Wellhöfer, Germany). After installing the DAP meter on the front of the multi-collimator of the ionization chamber, the calibration factor of the dosimeter was obtained using the reference dosimeter for accurate dose measurement. Experimental exposure values and values from the calibration dosimeter were calculated by multiplying each calibration factor. The calibration factor was calculated as 1.045. In order to calculate the calibration coefficient according to the tube voltage in the ionization type DAP dosimeter, the absorbed dose and the area dose were calculated and the calibration factor was calculated. The corrective area dose was calculated by calculating the calibration factor of the DAP meter.

예비유아교사 대상 「유아교과 논리 및 논술」 과목 운영의 어려움과 개선방안

정재은(Jaeeun Jung),정진화(Jin hwa Jung) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.23

목적 본 연구에서는 유아교사 양성을 위한 필수교과목인 유아교과 논리 및 논술 과목의 바람직한 운영을 위해 교수자가 겪는 어려움과 개선방안이 무엇인지 알아보는데 그 목적이 있다. 방법 수도권 소재 유아교육과에서 5년 이상 강의 경험이 있으며 유치원 교사 경력 2년 이상의 교수자 중 유아교과 논리 및 논술 과목강의 경험이 1학기 이상 있는 10명의 교수자를 목적표집하였다. 선전된 연구참여자들은 연구자들이 개별 심층면담 1회 이상 실시하였다. 개별면담을 통해 수집한 면담자료는 전사하여 기록하고 연구문제에 따라 범주화하였다. 개별면담을 통해 수집한 면담자료는 전사하여 기록하고 연구문제에 따라 범주화하였다. 결과 연구결과 논리 및 논술 교과목 운영의 어려움으로는 1) 교과 운영을 위한 목표 설정의 혼란, 2) 모의수업 운영의 부담, 3) 상대평가의 적절성에 대한 의문, 4) 교수자의 과목 운영에 대한 역량 부족이 도출되었다. 논리 및 논술 교과목 운영을 위한 개선 방안으로는 1) 표준 교과 개요 및 내용 구성안 마련, 2) 팀티칭 적용이 도출되었다. 결론 도출된 결과를 기반으로 논리 및 논술 교과목 운영의 어려움에 대한 요인을 분석하고 보다 효과적인 운영을 위한 개선방안에 대해 논의하였다. 이는 유아교육과 논리 및 논술 교과목의 정체성과 방향성 정립 마련의 기초자료가 될 것으로 기대한다. Objectives The purpose of this study was to investigate what difficulties instructors experience and how to improve them for teaching the course ‘Logic and Essay in Early Childhood Education’ which is one of the compulsory subject for preservice teachers. Methods Ten instructors with experience in teaching ‘Logic and Essay in Early Childhood Education’ were selected. They had more than 5 years of teaching experience in the Department of Early Childhood Education in Seoul and Kyunggido and 2 years or more teaching experiences in the Kindergarten. Individual in-depth interviews were conducted. The data were collected and categorized according to research questions. Results As a result of the study, difficulties when instructors teach the course included the following four categories: 1) confusion in goal setting for the course, 2) burden how to apply the microteaching in the course, 3) doubts about the appropriateness of evaluation, and 4) lack of competency in the course. The improvement plans for the course included the following two categories: 1) a standard curriculum outline and content structure plan were prepared, and 2) various teaching methods such as team teaching were applied. Conclusions Based on the results, factors for the difficulties in teaching the logic and essay course were analyzed, and improvement plans for more effective teaching were discussed. It is expected that this will serve as a basis for establishing the identity and direction of early childhood education curriculum.