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        • 군장교 후보생과 의료방사선 전공학생의 방사선 인식도 비교

          성열훈 청주대학교 보건의료과학연구소 2014 보건의료과학연구 Vol.2 No.2

          The purpose of this study was to present basic research data to utilize of having the correct perception, after investigating the awareness of radiation for military officer candidate versus medical radidtion majoring students. The methodological design was based on a quantitative survey and a ferquency analysis was done. The analysis objects were survey papers (N=300) answered by that targeted related majors at a Cheongju university. the questionnaires, and study tool, were directly distributed and collected from 1 April to 31 May in 2013. A total of 16questionnaires was 'self perception of radiation' radiation risk' benefit from radiation' 'radiation controllde'. As the result of the questionnaires, compared with the medical radiation majors' students. the radiation awareness of military officer candidate was found that generally negative preception of radiation with a low level of radiation knowledge. we suggested that curriculum based on objective and having the correct perception of radiation may need to military officer anddidate. Improving awareness of radiation might have significant contributions to reducing conflict due to the prejudice and misunderstanding of radiation

        • KCI등재

          영상의학과 전산화단층촬영 검사 대기일 단축을 위한 6-시그마 적용사례 연구

          성열훈 대한안전경영과학회 2010 대한안전경영과학회지 Vol.12 No.2

          The purpose of the study was to apply and to expand the six sigma to reduce waiting times for computed tomography (CT) examination which manipulated by the department of radiology. It was preceded by DMAIC (Define, Measure, Analyze, Improve, and Control). In the stage of definition, it wereselected for total 5 critical to quality (CTQ), which were the kindness, the waiting time, the examination explanation, the waiting day and the waiting stand environment, that increased the reserved time of CT examination. In the stage of measurement, the number of examinations and of reservation waiting days performed and resulted in final CTQ(Y) which measured each 1.68 and 1.85 sigma. In the stage of analysis, the examination concentrated on morning time, non-scheduled examination of the day, the delayed time of booking, frequent telephone contacting and equipment malfunction were determined as variable key causes. In the stage of improvement, it were performed with expansion of the examination in the morning time, integration of laboratories that used to in each steps, developing the ability of simultaneous booking schedule for the multiple examinations, developing program of examination request, and the customer management team operations. For the control, the number of examinations and reserved waiting days were measured each 3.14 and 1.13 sigma.

        • KCI등재

          아크릴로나이트릴・뷰타다이엔・스타이렌 수지와 용융적층조형 방식의 3차원 프린팅 기술로 제작된 전산화단층영상장치 팬톰에서 영상 균일성 및 X선 투과성 평가

          성열훈 대한방사선과학회 2016 방사선기술과학 Vol.39 No.3

          본 연구에서는 3차원(3-dimensional, 3D) 프린팅 기술로 출력된 팬톰에 대한 X선 투과성을 평가하고자 하였다. 3D 프린팅 방식은 용융적층조형(fused deposition modeling, FDM) 방식을 이용했으며 소재는 아크릴로나이트릴· 뷰타다이엔·스타이렌(acrylonitrile butadiene styrene, ABS)을 사용하였다. 팬톰은 원통 모양으로 설계하였으며 전산화단층영상장비(computed tomography, CT)에서 획득한 단면영상으로 균일도를 측정하였다. X선 투과성 평가는 3D 출력된 팬톰 내부에 이온챔버를 삽입하여 실시하였다. 그 결과, 평균 균일도가 2.70 HU이었으며 기존 폴리메틸 메타크릴레이트(poly methyl methacrylate, PMMA) CT 팬톰과 3D 프린터로 출력된 팬톰에서 측정된 X선 투과성의 상관관계는 0.976로 높은 상관관계가 있는 것으로 나타났다. 향후 3D 프린팅 기술을 이용한 방사선정도관리 팬톰 제작에 기초자료로 활용할 수 있으리라 기대한다. The purpose of this study was to evaluate the radiolucency for the phantom output to the 3D printing technology. The 3D printing technology was applied for FDM (fused deposition modeling) method and was used the material of ABS (acrylonitrile butadiene styrene) resin. The phantom was designed in cylindrical uniformity. An image uniformity was measured by a cross-sectional images of the 3D printed phantom obtained from the CT equipment. The evaluation of radiolucency was measured exposure dose by the inserted ion-chamber from the 3D printed phantom. As a results, the average of uniformity in the cross-sectional CT image was 2.70 HU and the correlation of radiolucency between PMMA CT phantom and 3D printed ABS phantom is found to have a high correlation to 0.976. In the future, this results will be expected to be used as the basis for the phantom production of the radiation quality control by used 3D printing technology.

        • KCI등재후보

          3차원 볼륨 렌더링을 이용한 가상 돌출형 전립선 부피 평가

          성열훈,주용현,임재동,최보영,Seoung, Youl-Hun,Joo, Yong-Hyun,Rhim, Jae-Dong,Choe, Bo-Young 한국의학물리학회 2009 의학물리 Vol.20 No.4

          2차원의 영상을 이용한 돌출형 전립선 비대증의 부피 평가방법에서 돌출부위를 포함시킬 경우와 포함시키지 않을 경우의 부피변화를 3차원 볼륨 렌더링(volume rendering, VR)을 이용하여 비교 평가하고자 한다. 돌출형 전립선 부피측정을 위한 가상 전립선 모델은 곤약을 이용해 임의로 평균 1 cm 정도로 돌출되도록 하여 10 ml에서 각각 10 ml씩 부피를 변화시켜 100 ml까지 총 10 개의 모델을 제작하였다. 이 때 제작된 모델의 부피측정은 64 channel 전산화단층촬영(computed tomography, CT)과 3.0 Tesla 자기공명영상(magnetic resonance image, MRI)을 이용하여 획득된 3차원 볼륨 영상자료로 계측하였다. 산출한 CT와 MRI영상들의 3차원 볼륨데이터 근접성 평가를 위해 wilcoxon 부호순위(signed rank) 검정을 하였다. 또한 획득한 영상자료는 3차원 영상처리를 통하여 볼륨 렌더링으로 재구성한 후 타원체부피공식법을 이용하여 돌출부위를 포함시킬 때와 포함하지 않을 때의 부피를 구하였다. 이 때 돌출 유무에 따라 각각 측정된 부피와 3차원 볼륨 렌더링의 부피를 wilcoxon 부호순위(signed rank) 검정을 사용하여 유의성을 평가했으며 상관계수(pearson's correlation coefficient, r)를 사용하여 상관관계를 분석하였다. 계측된 가상 전립선 모델의 돌출부위길이는 CT에서 $0.90{\pm}0.18\;mm$, MRI에서 $0.75{\pm}0.11\;mm$이었으며, CT와 MRI에서 계측된 3차원 영상 부피의 p-value는 0.414로 유의한 차이는 없었다. 그러나 MRI에서 측정된 3차원 영상 부피와 2차원 영상에서 돌출부위를 포함시킬 때의 p-value는 0.005인 반면 포함하지 않을 때의 p-value는 0.139로 나타났으며, CT에서도 측정된 3차원 영상 부피와 2차원 영상에서 돌출부위를 포함시킬 때의 p-value는 0.005인 반면 포함하지 않을 때의 p-value는 0.057로 나타났다. 돌출형 전립선의 부피측정은 돌출부위를 제외하고 상하길이를 측정하는 것이 3차원 볼륨 렌더링에 의한 부피 값과 더 가까운 부피 값을 얻을 수 있었다. This study is to compare the accuracy of evaluation regarding the volume of the prostate, which three-dimensional volume rendering was produced the shape of protrusion, by measuring two kinds of craniocaudal length from the top of the protrusion and from the exclusion of the protrusion as the starting points. For the imaginary protrusion prostate models, total of 10 models were roughly made by using devils-tongue jelly and changing each of the 10 ml of capacity from 10 ml to 100 ml. For the protrusion prostate models aimed at estimating the real volume, through 64 cannel computed tomography (CT) and 3.0 tesla magnetic resonance image (MRI) were conducted by planimetry technique from three-dimensional volume rendering. And then we performed to evaluate on significance of these volumes by wilcoxon signed rank test. Also the obtained volumes data by ellipsoid volume formula were measured the volume of protrusion prostate models two times with each method using the two kinds of craniocaudal length from top of the protrusion and from exclusion of the protrusion as the starting points. Finally, the significance of differences using wilcoxon signed rank test was evaluated between the real volume by planimetry technique and the measured volume by ellipsoid volume formula from three-dimensional volume rendering. The average of the protrusion length on the models was $0.90{\pm}0.18\;mm$ in CT and was $0.75{\pm}0.11\;mm$ in MRI. There were not statistically significant difference between MRI and CT from the volume of protrusion prostate models (p=0.414). In MRI (p=0.139) and CT (p=0.057), there were not statistically significant difference between the real volume by planimetry technique and the measured volume by ellipsoid volume from exclusion of the protrusion as the starting points. While, there were statistically significant difference between the real volume by planimetry technique and the measured volume by ellipsoid volume from top of the protrusion as the starting points in MRI (p=0.005) and CT (p=0.005). For the accurate measurement of the protrusion prostate models, the craniocaudal length of the prostate should be measured from the exclusion of the protrusion as the starting points.

        • KCI등재

          CR(Computed Radiography)에서 초점 크기와 디지털영상후처리에 따른 공간분해능의 정량적 분석

          성열훈 한국디지털정책학회 2014 디지털융복합연구 Vol.12 No.11

          본 연구의 목적은 컴퓨터 방사선영상에서 X-선 초점 크기와 디지털영상후처리에 따른 공간분해능을 정량적 으로 분석하고자 하였다. 초점의 크기는 소초점(0.6 mm)와 대초점(1.2 mm)을 이용하였다. 공간분해능의 정량적 분석 은 엣지 측정법의 변조전달함수(MTF)를 이용하였다. 디지털영상후처리는 다단계 이미지 대비 증폭 알고리즘을 이용 하여 경계면 증강과 대조도 증강에 따른 50%와 10%의 MTF를 평가하였다. 그 결과 모든 초점에서 MTF 50%의 공 간분해능이 대조도 증강보다 경계면 증강에서 유의하게 높았다. 또한 대초점에서 획득된 영상은 디지털영상처리를 통해 공간분해능이 향상되었다. 결론적으로 이러한 결과는 컴퓨터 방사선영상에서 골격계 및 흉부영상과 같은 고 공 간분해능 임상영상을 얻기 위한 기초자료로 활용할 수 있다. The aim of the present study was to carry out quantitative analysis of spatial resolution for the influence of the focus size and digital image post-processing on the Computed Radiography (CR). The modulation transfer functions of an edge measuring method (MTF) was used for the evaluation of the spatial resolution. The focus size of X-ray tube was used the small focus (0.6 mm) and the large focus (1.2 mm). We evaluated the 50% and 10% of MTF for the enhancement of edge and contrast by using multi-scale image contrast amplification (MUSICA) in digital image post-processing. As a results, the edge enhancement than the contrast enhancement were significantly higher the spatial resolution of MTF 50% in all focus. Also the spatial resolution of the obtained images in a large focus were improved by digital image processing. In conclusion, the results of this study should serve as a basic data for obtain the high resolution clinical images, such as skeletal and chest images on the CR.

        • KCI등재

          Evaluation of Radiation Dose Reduction during CT Scans by Using Bismuth Oxide and Nano-Barium Sulfate Shields

          성열훈 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.1

          The purpose of the present study was to evaluate the radiation dose reduction and the image quality during CT scanning by using a new dose reduction fiber sheet (DRFS) with commercially available bismuth shields. These DRFS, were composed of nano-barium sulfate (BaSO4) filling the gaps left by the large bismuth oxide (Bi2O3) particles. The radiation dose was measured five times at a direction of 12 o’clock from the center of the polymethyl methacrylate (PMMA) head phantom by using a CT ionization chamber to calculate an average value. The image quality of measured CT transverse images of the PMMA head phantom depended on the X-ray tube voltage and the type of shielding. Two regions of interest in the CT transverse images were chosen, one from the right area and the other from the left area under the surface of the PMMA head phantom and at a distance of ion chamber holes located in a direction of 12 o’clock from the center of the PMMA head phantom. The results of this study showed that the new DRFS shields could reduce the dosages by 15.61%, 23.05%, and 22.71% at 90 kVp, 120 kVp, and 140 kVp, respectively, than with these of a conventional bismuth shield of the same thickness while maintaining image quality. In addition, the DRFSs produced were about 25% thinness than conventional bismuth. We conclude, therefore, that a DRFS can replace conventional bismuth as a new shield.

        • 진단용방사선발생장치 안전관리 기준에 의한 임상 진당용 X선장치의 정확성과 재현성 평가

          성열훈 청주대학교 보건의료과학연구소 2018 보건의료과학연구 Vol.6 No.2

          The purpose of this study was to investigate and analyze the accuracy and reproducibility of the diagnostic X ray system based on the safety management standard of the diagnostic radiation generators. The target medical institutions selected five secondary medical centers with 18 diagnostic X ray systems in Cheongju area from 2015 to 2017. The evaluation items of accuracy and reproducibility by the safety management standard of Korea ministry of food and drug safety (KMFD) were seven items in the following order: percent line voltage regulation, exposure dose reproducibility, kVp accuracy, light field radiation field congruence, central ray alignment, illumination, half value layer. As a result, the exposure dose reproducibility, kVp accuracy and illumination test showed relatively low acceptance rate, and it is would necessary to continuously manage it.

        • KCI등재

          보건계열 대학생의 취업역량강화 프로그램이 대학생활 적응과 학업성취도에 미치는 구조적 관계

          성열훈,김성수,Seoung, Youl-Hun,Kim, Sung-Soo 한국디지털정책학회 2013 디지털융복합연구 Vol.11 No.2

          본 연구는 보건계열 대학생을 대상으로 취업역량강화 프로그램 수행 후 만족도가 대학생활 적응과 학업성취도에 어떠한 영향이 있는지를 실증분석하기 위해 수행하였다. 충북 소재 1개 대학교의 보건계열 전공자를 대상으로 취업역량강화 프로그램 수행 후 만족도 및 대학생활 적응과 학업성취도를 자기기입식 설문조사를 통하여 수집하였다. 분석결과 취업역량강화 프로그램 만족도가 높을수록 대학생활 적응이 좋은 것으로 나타났으며, 높아진 대학생활 적응은 학업성취도에 영향을 미치게 됨을 알 수 있었다. 비록 취업역량강화 프로그램 만족도가 학업성취도에는 직접적인 영향관계가 없었으나 대학생활 적응을 통해 학업성취도가 높아져 향후 취업에도 긍정적인 영향이 있음을 시사한다. 대학 적응을 높이고 취업 활성화를 위한 환경 마련을 위해 학과 특성에 맞는 취업관련 프로그램을 활성화하는 적극적인 노력이 필요하다. The study conducted an employment capability reinforcement program targeting health-related college students, and then carried out positive analysis to find out how satisfaction affects adjustment to college life and academic achievement. An employment capability reinforcement program was conducted which targeted health related majors at a university located in Cheongbuk, and information on satisfaction, adjustment to college life, and academic achievement was collected through a self-administered questionnaire. The analysis results revealed that the higher the satisfaction for the employment capability reinforcement program, the better the adjustment to college life, while increased adjustment to college life affected academic achievement. Although the employment capability reinforcement program had no direct relationship of influence to academic achievement, the study shows that it does lead to increased academic achievement by way of adjustment to college life, which ends up as a positive affect for future employment. Therefore, active efforts are necessary to revitalize employment related programs that suit the characteristics of each department in order to establish an environment for revitalizing employment and increasing adjustment to college life.

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