• 대한방사선기술학회지:방사선기술과학
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• 제46권5호
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• pp.427-433
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• 2023

This study aimed to quantitatively compare the diameters measured directly from the coronal plane or sagittal plane of 2D digital subtraction angiography (DSA) and the cross-sectional area-converted diameters calculated from contrast-enhanced MR (CE-MR) imaging. A retrospective analysis was conducted on 20 patients who underwent both 2D DSA and CE-MR imaging. Firstly, the venous diameters of the superior sagittal sinus (SSS) and transverse sinus (TS) were directly measured from 2D DSA. Subsequently, the axial planes for SSS diameter and the sagittal plane for TS in CE-MR imaging were utilized to calculate cross-sectional area-based converted diameters. The numerical values obtained from 2D DSA and CE-MR imaging were compared pairwise at each location. For SSS, the diameter measured by 2D DSA was 27% larger than the conversion-based diameter from CE-MR imaging (9.8±1.4 mm vs. 7.1±1.3 mm, P<0.05). Similarly, for the right TS, the difference was 16% (8.8±3.2 mm vs. 7.4±2.0 mm, P<0.05), and for the left TS, the difference was 22% (8.4±2.8 mm vs. 6.6±1.3 mm, P<0.05). In conclusion, the diameter measured directly in conventional 2D DSA may be larger than the diameter converted based on the cross-sectional area. Therefore, when selecting the size of the stent, it is crucial to make precise determinations while keeping this fact in mind.

• 대한방사선기술학회지:방사선기술과학
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• 제46권6호
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• pp.485-491
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• 2023

As an auxiliary tool for fixing the patient's posture when taking an X-ray, sponges with high radiolucencies are laminated in various thicknesses. This study aimed to evaluate the usefulness of an auxiliary tool for hand oblique projection X-ray by manufacturing it with a uniform thickness by 3D printing and comparing it with existing sponge tools. In the auxiliary tool, radiolucency was measured at the stairs where each finger was located, and pixel information values were compared in the digital imaging and communications in medicine(DICOM) image. Contrast to noise ratio(CNR) and signal to noise ratio(SNR) were compared by shooting the hand phantom and the auxiliary tool together. As the thickness of the sponge tool increased, radiolucency decreased by 15.52% and pixel information value increased by 20.61%. The transmittance of the 3D printing tool increased by 0.82%, and the pixel information value differed by 5.66%. CNR and SNR increased by 20.03% and 22.42% in 3D printing compared to existing sponge tools. while taking hand oblique projection, maintaining the thickness of the auxiliary tool uniformly through 3D printing maintains high radiolucency and minimal impact on medical images, and increases CNR and SNR, making it useful as an auxiliary tool for taking hand oblique projection.

• 유통과학연구
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• 제22권2호
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• pp.41-50
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• 2024

Purpose: This study aims to identify the distribution of skill evolution for accounting personnel during the health crisis and investigate the impact of accounting skills in developing resilience among accounting personnel. Research design, data, and methodology: A total of 131 respondents of accounting personnel participated in a self-administered survey questionnaire. This data is analysed using the partial least square structural equation modeling. Results: The results show that accounting skills, digital skills, and writing skills have a significant impact on developing accounting personnel's motivation, subsequently leading to resilience. Conclusions: This study adds to the literature on the new requirements and future profiles of Malaysian organisation and the accounting profession. This will be a good reference for the practitioners to identify the relevant skills required for accountants after the pandemic. Furthermore, this study includes encouraging motivation and skills to improve resilience in the Malaysian context further to understand the push factors on skills evolution among the accountants. Higher education institutions with accounting courses would consider the potential future skills of accountants to meet market demands on time when updating the institutions' curricula program. Hence, the relevant skills required can be developed and practiced at the education level, especially secondary and tertiary levels.

• Imaging Science in Dentistry
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• 제53권4호
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• pp.365-373
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• 2023

Purpose: In the context of COVID-19, studies evaluating the adherence of dentists and dental students to infection control are relevant due to their high occupational exposure and risk, as well as their responsibility for disseminating information and good practices. This study evaluated the adherence of dentists and dental students to infection control in the oral radiology field in the setting of the COVID-19 pandemic on different continents. Materials and Methods: This cross-sectional observational study involved individuals who performed intraoral radiographic examinations during the COVID-19 pandemic. The Questionnaire on Infection Control in Oral Radiology was administered virtually using a Google Form. Participants from different continents(the Americas, Africa, Europe, Asia, and Oceania) were recruited. Data were subjected to descriptive analysis and simple and multiple binary regression (5%). Results: There were 582 valid answers, and 68.73% of the participants were from the Americas, 18.90% from Europe, and 12.37% from Asia. The median score for infection control protocols was 94 points for dental students and 104 points for dentists, and participants below the median were considered to have low adherence to infection control in oral radiology. Low access to infection control was found for 53.0% of dentists in the Americas, 34.0% from Europe, and 26.9% from Asia. Conclusion: The adherence to infection control protocols in oral radiology was low even in the face of the COVID-19 pandemic. The results may help improve the awareness of students and professionals, since oral radiology routines have the potential for transmitting COVID-19.

• 문화기술의 융합
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• 제10권3호
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• pp.391-396
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• 2024

본 연구에서는 헬스케어 분야에 특화된 개체명 사전을 구축하기 위해 기존 N-Gram 방식의 한계를 극복하고 성능을 향상하게 시키기 위해 새로운 역 N-Gram 방식을 제안하였다. 제안된 역 N-Gram 방식은 헬스케어 관련 빅데이터의 복잡한 언어적 특성을 더 정밀하게 분석하고 처리할 수 있다. 제안된 방식의 효율성 검증을 위해 매년 1월에 개최되는 소비자 가전 전시회(Consumer Electronics Show: CES) 기간 동안 발표된 헬스케어 및 디지털 헬스케어 관련 빅데이터를 수집하기 위하여 뉴스를 대상으로 2010년 1월 1일부터 31일, 그리고 2024년 1월 1일부터 31일까지 언급된 2,185건의 뉴스 제목 및 요약문을 파이썬 프로그래밍언어로 새로운 역 N-Gram 방식을 구현하여 전처리한 결과, 헬스케어 분야에서의 자연어 처리를 위한 사전이 안정적으로 구축되었음을 확인할 수 있었다.

• 한국의상디자인학회지
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• 제26권1호
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• pp.45-60
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• 2024

This study analyzes the athleisure wear purchase status, wearing conditions, and design preferences of men in their 20s and 30s and provides basic data for the development of men's athleisure wear that reflects consumer preferences. An online survey was conducted on 200 men from August 23 to August 27, 2023. The questionnaire consisted of a total of 48 questions, including 8 questions about the respondent's general information, 19 questions about the purchase status of athleisure wear, 6 questions about the status of wearing athleisure wear, and 15 questions about athleisure wear design preferences. The survey results are as follows. The most common motive for exercise participation was 'maintaining health.' 'Nike' was the most preferred and purchased brand among athleisure wear brands, and the main place of purchase of athleisure wear was 'Internet and mobile shopping malls', reflecting the recent purchasing trend of the MZ generation. When purchasing athleisure wear, the most common selection criterion was 'design', followed by 'fitting comfort', 'possibility to use as daily wear', and 'price'. The most common route to obtain purchase information was 'Internet search', and the 'overall satisfaction' with athleisure wear was found to be satisfactory with an average of 3.83. The most common reason for wearing athleisure wear was 'because it is comfortable to do activities', followed by 'because it can be used as everyday wear'. Lastly, 'black', 'short-sleeved t-shirt', 'short length' sleeve, 'round neckline', 'waist length', and 'relaxed loose fit' were preferred for the top design, and 'black', 'shorts', 'full elastic type' waistband, 'regular fit that fits the body well' were preferred for the bottom design.

• 한국안전학회지
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• 제39권1호
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• pp.55-61
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• 2024

In response to the COVID-19 pandemic, the logistics industry in Korea has rapidly been expanding, with offline demand concentrating on online platforms owing to the development of digital infrastructure. This has increased the workload of courier drivers considerably, along with labor intensity. A delivery driver died recently from overwork due to the continuous increase in delivery volume, which raises social concerns. Delivery drivers work long hours, (over 12 hours) and are greatly affected by weather conditions, such as snow, rain, heat waves, and cold waves. In addition, they lack a fixed workplace; perform atypical work handling workpieces of various sizes, weights, and shapes; and spend a large amount of time driving as part of their work. This work involves a high level of tension and requires attention and concentration. Despite the frequency of industrial accidents in the courier industry, studies on safety and health to quantitatively analyze and systematize the work of courier workers are very scarce. Therefore, to define the work process necessary for investigating the harmful factors in delivery service and the work analysis, this study conducted interviews and on-site surveys to analyze the unit work of the delivery service by targeting delivery workers. In other words, a framework of unit work for work analysis was presented to enable research and analysis by considering the aforementioned characteristics of the courier industry. The process was broadly divided into work, transport, storage, delay, and inspection. Work was divided into loading, sorting, unloading, and door subcategories, and transportation was divided into vehicle, cart, and walking subcategories as well as 10 small processes. Moreover, 22 unit works were again drawn by conducting field surveys and interviews. The risk of unit work derived from this study was ergonomically evaluated, and the ergonomic analysis revealed that uploading and transportation were the most dangerous. The results of this study could be used as basic data for preventing industrial accidents among courier workers, whose work has increased with the logistics volume and the development of the logistics industry.

• 한국의학물리학회지:의학물리
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• 제23권3호
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• pp.154-161
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• 2012

최근 백만 볼트 영상(megavoltage imaging, MVI)에서 급격히 발전해 온 디지털 방사선영상(digital radiography, DR)은 치료용 방사선영상 기술이 발전함에 따라 매우 정확하면서 간단하게 측정할 수 있는 일반적인 정도관리(quality assurance, QA) 방법을 요구하게 되었다. 본 연구의 목적은 일반적인 QA 방법과 computed radiography (CR) 장비를 사용하여 MVI의 변조전달함수(modulation transfer function, MTF), 잡음전력스펙트럼(noise power spectrum, NPS), 양자검출효율(detective quantum efficiency, DQE)를 평가하고자 하였다. 텅스텐으로 구성된 $19{\times}10{\times}1cm^3$ 두께의 엣지(edge) 블록을 사용하였으며, 6 MV energy를 사용하였다. 또한 검출기는 CR-IP (image plate), CR-IP-lead, the CR-IP-back (lanex TM fast back screen), CR-IP-front (lanex TM fast front screen)를 사용하였으며, pre-sampling MTF를 계산하였다. CR-IP의 MTF는 0.70 lp/mm를 나타내었고, CR-IP front의 MTF는 1.10 lp/mm로서 가장 높은 값의 고해상도 공간분해능을 보였다. 가장 우수한 검출기의 NPS는 CR-IP front screen에서 확인되었다. 공간주파수가 증가함에 따라 1.0 cycles/mm의 가까운 DQE를 획득하였다. 본 연구결과로서 자체 제작한 엣지 블록 방법은 MVI의 MTF, NPS, DQE를 평가하는 일반적인 QA 방법으로 사용될 수 있음을 확인하여 주었다.

• 대한치과보철학회지
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• 제52권2호
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• pp.97-104
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• 2014

연구 목적: 본 연구의 목적은 현재 시판되는 4종의 레진계 임플란트 전용 임시 시멘트를 디지털 방사선 사진을 분석하여 방사선 불투과성을 비교 평가 하는 것이다. 연구 재료 및 방법: 주문 제작한 분할형 금속몰드에 4종의 레진계 임플란트 시멘트(Estemp $Implant^{TM}$ (Spident, Incheon, Korea), $Premier^{(R)}$Implant (Premier, Pennsylvania, USA), $Cem-Implant^{TM}$ (B.J.M lab, Or-yehuda, Israel), $InterCem^{TM}$ (SCI-PHARM, California, USA))와 대조군인 Elite Cement$100^{TM}$ (GC, Tokyo, Japan)를 각각의 제조사의 지시에 따라 혼합하여 경화시킨다. 시멘트당 두께에 따라 각 10개씩 총 150개의 시편을 제작하고 각 시편을 순수(99%이상) aluminum으로 제작한 step wedge와 나란히 위치시켜 Intraoral X-ray unit (Esx, Vatech, Korea)와 디지털 X-ray sensor (EzSensor, Vatec. Korea)를 사용하여 촬영하였다. 디지털 방사선 이미지를 Image J 1.47m (Wayne Rasband, National Institutes of Health, USA)과 Color inspector 3D Ver 2.0 (Interaktive Visualisierung von Farbr$\ddot{a}$umen, Berlin, Germany)의 프로그램을 이용하여 aluminum wedge equivalent thickness (mm Al)를 평가하였다. 결과: 본 연구에서 사용된 5종의 시멘트 중 방사선 불투과성은 Elite Cement$100^{TM}$이 모든 두께에서 가장 높았으며 레진계 임플란트용 시멘트중에서 $InterCem^{TM}$이 가장 높았고, $Premier^{(R)}$ Implant $Cement^{TM}$, $Cem-Implant^{TM}$, Estemp $Implant^{TM}$순으로 나타났다. 레진계 임플란트용 시멘트 중 $InterCem^{TM}$은 모든 두께에서 ISO Standard No. 4049에 맞는 방사선 불투과성을 보였고, $Cem-Implant^{TM}$는 0.5 mm 두께에서만 ISO Standard No. 4049에 적합한 방사선 불투과도를 나타냈다. 결론:이번 연구에 사용된 레진계 임플란트 시멘트중 방사선 불투과도는 전반적으로 높지 않았고, $InterCem^{TM}$ 만이 연구조건 및 기준에 만족하는 방사선 불투과도를 보였다.

• 한국방사선학회논문지
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• 제14권5호
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• pp.603-612
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• 2020

본 연구의 목적은 하지 혈관조영검사에서 매개변수인 관전류 (mA)와 SOD에 대한 조영제 농도(300, 320, 350) 희석률의 관계가 화질에 미치는 영향을 알아보는 데 있다. 이를 위해 말초혈관 직경 크기로 자체 제작한 3 mm 혈관모형 Water 팬텀을 이용하여, 관전류 (mA), SOD 변화와 조영제 농도(300, 320, 350) 희석률 변화의 관계를 SNR 값과 CNR 값으로 측정하고 변동계수를 (cv < 10) 분석하였다. SNR 값과 CNR 값의 측정에 사용된 소프트웨어는 Image J 1.50i, (NIH) National Institutes of Health, USA)로, PACS에 전송된 의료영상표준(DICOM, digital imaging and communications in medicine) 3.0 파일에서 팬텀에 대한 관심영역(ROI, region of interest)과 배경(Background)의 영상 신호를 수치적으로 확인한 후 평균 신호값(MPV, mean pixel value)과 표준편차(SD, standard deviation)를 이용하였다. 관전류 변화에 대한 조영제 농도별 희석률에서 관전류 (146 mA)과 관전류 (102 mA)의 SNR과 CNR 비교결과, SNR과 CNR 모두 CM : N/S 희석률 (100% ~ 30% : 70%) 구간까지 변동계수 값이 10 이하로 작게 나타났으나, CM : N/S 희석률 (20% : 80%~ 10% : 90%) 구간에서는 변동계수 값이 10 이상으로 나타났다. SOD 변화에 대한 조영제 농도별 희석률에서 SOD (32.5 cm)과 SOD (22.5cm)의 SNR과 CNR 비교 결과, SNR과 CNR 모두 CM : N/S 희석률 (100% ~ 30% : 70%) 구간까지 변동계수 값이 10 이하로 작게 나타났으나, CM : N/S 희석률 (20% : 80%~ 10% : 90%) 구간에서는 변동계수 값이 10 이상으로 나타났다. SOD 변화에 대한 조영제 농도별 희석률에서 SOD (32.5 cm)과 SOD (12.5cm)의 SNR과 CNR 비교 결과, SNR과 CNR 모두 CM : N/S 희석률 (100% ~ 30% : 70%) 구간까지 변동계수 값이 10 이하로 작게 나타났다. 그러나 CM : N/S 희석률 (20% : 80%~ 10% : 90%) 구간에서는 변동계수 값이 10 이상으로 나타났다. 결과적으로 인터벤션에서 하지 말초혈관조영술을 포함한 다른 검사나 시술에서 낮은 관전류 값을 설정하고, 테이블은 영상수상기에 최대한 가깝게 하여, 조영제 농도(300)을 CM : N/S 희석률 (30% : 70%)로 사용하는 것이 신장에 대한 부담과 피폭에 대한 부담을 동시에 줄이면서 적정 농도의 영상을 얻을 수 있는 가장 효율적인 방법으로 제시한다.