• Physical Therapy Rehabilitation Science
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• 제9권2호
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• pp.74-81
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• 2020

Objective: To prevent low back pain, an objective evaluation tool to evaluate pelvic mobility and exercise to improve the flexibility of the lumbar region is needed. The purpose of this study was to compare the results of pelvic mobility measurements using the Wii Balance Board (WBB) and Sensbalance Therapy Cushion (STC), evaluate the usefulness of the STC as a tool for measuring pelvic mobility. Design: Cross-sectional study. Methods: Fifty healthy subjects participated in this study. The subjects performed pelvic mobility range, proprioception, reaction time and reach of the arm using the STC. The pelvic movement parameter was measured two times to determine the intra-rater reliability. To measure the correlation between lumbar muscle tension and pelvic mobility, Myovision was used to measure tension of L4, L5 level erector spinae muscle. Correlations between measured variables were checked to determine the validity of the pelvic mobility assessment tool. Results: STC showed high test-retest reliability in pelvic tilt measurement and reaching task [intraclass correlation coefficients (3,1)=0.804-0.915]. The relationship between WBB and STC showed a significant positive correlation with the pelvic tilt and reaching task (p<0.05). Posterior tilt and erector spinae activation (Lt. L5) showed a significant negative correlation (p<0.05). Left, right tilt and erector spinae activation (L5) showed a significant negative correlation (p<0.05). Conclusions: This study confirmed the advantages of the STC and found efficiency as an objective measuring device of pelvic mobility.

• 대한기계학회논문집 C: 기술과 교육
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• 제2권1호
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• pp.1-8
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• 2014

최근 차량이 기계장치 중심에서 전기전자 장치 중심으로 발전하고 있으며, 상용차량 역시 전기전자 장치가 증대되고 있다. 정전용량 방식의 연료 센서는 연료의 레벨을 정전용량 값으로 측정하여 센서 내 MCU 를 통해 연산과정을 거쳐 최종 전압값의 신호로 출력해 주는 센서이다. 기존의 세라믹 저항을 이용한 센서보다 내구성이나 연료 측정 정확성이 향산된 진보된 센서로 센서에 대한 소프트웨어 검증을 위하여 가변 커패시터 보드를 제작하여 R-BENCH TOOL 을 통해 test case 를 자동으로 생성시킨 후 연료 센서의 소프트웨어 검증을 시도하였다. 또한 결론으로 98% 이상의 높은 소프트웨어의 신뢰도가 있음을 확인하였다.

• 한국전자파학회논문지
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• 제17권4호
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• pp.380-386
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• 2006

CPW(Co-Planer Waveguide) 전송선을 이용하여 자동차 연료 게이지 시스템인 전자식 연료 센더를 개발 제작하였다. 전송선 주위의 물질에 따라 전송선의 특성 임피던스가 변화되는 특성을 이용하였다. 자동차 연료통 속의 휘발유 혹은 경유의 높이에 따라 전송선의 특성 임피던스가 변화하면 반사량이 달라지므로 반사된 전압을 증폭함으로써 기존의 기계식 장치를 대체하는 시스템을 제작하였다. 브이(buoy)에 의한 부력과 연동된 저항 변화를 이용한 기존의 floating 방식이 갖는 기계식 작동 고장을 없애고, 유량 높이 오차를 줄이도록 하였다. 두께 1.6 mm의 Epoxy 기판에 CPW 전송 선로 및 제반 전자 장치를 구성하여 실측한 결과 기존 시스템에 비해 높이 오차가 적고 선형성이 우수한 특성을 보였다. 이 시스템은 PCB상 SMT로 제작되어 저가이면서도 양산성이 좋고 수명이 반영구적이어서 기존 시스템과의 경쟁력에서 우위를 보일 것으로 예상된다.

• 마이크로전자및패키징학회지
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• 제10권4호
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• pp.1-8
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• 2003

고감도 모아레 간섭계를 이용하여 세라믹 ball grid array 패키지 결합체의 열-기계적 거동을 분석하였다. 한 온도 사이클의 선택된 몇 개의 온도 단계에서 모아레 간섭무늬를 기록하고 해석하였다. 패키지 결합체의 온도변화에 따른 전체적인 변형과 국부적인 변형거동을 정량적으로 나타내었고, 패키지의 굽힘변형과 맨 바깥쪽 솔더볼의 전단변형률에 대한 거동을 토의하였다. 높은 온도에서는 저온 융점 솔더의 응력완화로 인하여 심각한 비선형 거동이 발생되었으며. 솔더볼의 변형을 해석한 결과 높은 온도에서 저온용융 솔더부에 비탄성 변형이 축적되었음을 알 수 있었다.

• 한국간호교육학회지
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• 제20권1호
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• pp.37-46
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• 2014

Purpose: This study was to measure and identify the differences of perceived confidence in practice of core basic nursing skills performed by new graduate nurses in Korea. Methods: The tool used in this study was a questionnaire for measuring the confidence in 20 items of core basic nursing skills which was structured based on Korean Accreditation Board of Nursing Education tool. 231 new graduate nurses participated in this study. The reliability of this questionnaire had Cronbach's ${\alpha}$ .918. Results: Subjects who experienced simulation education and standard patient education were 86.6% and 35.9%, respectively. Item enema intervention, tracheostomy care, and blood transfusion showed low practice confidence level. These items showed significant differences on whether the subjects experienced simulation and clinical practicum or not. Conclusion: Developing and managing clinical education program under deep cooperation between practicum agency and clinical instructor are needed. Simulation practicum will complement insufficient core basic nursing skills between newly graduated nurses before they allocate at the clinical department.

• 의학교육논단
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• 제15권3호
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• pp.125-135
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• 2013

Since the establishment of the national medical licensing examination board in 1992, the medical licensing examination system has changed enormously and this has had a number of impacts on examination services. All those reforms were aimed at improving the relevance and reliability of the test. Several attempts of the testing system have appeared in the new examination service, and which have also brought about the changes in the medical school curriculum such as introducing integrated courses instead of traditional subjects, using test scores as a reference to the post-graduation selection test. Some examples of changes in the examination system are as follows: 1) choosing three integrated test subjects and outlines of their reference content instead of 15 academic subjects, 2) adjusting the ratio of multiple choice question items to focus more on the problem solving level, 3) introduction of 'one-best answer' single set and 'extended matching type items, 4) item construction based on real clinical cases and real clinical materials. Recently, a clinical skill test system has been introduced to measure examinees' basic clinical skills competencies. Despite continuing efforts, the examination system still has many issues remaining to be solved. These problems include the differential weighting of test items, appropriate threshold for passing, and practicality of pre-testing to stabilize the passing rate and avoid the hazards of newness and undesirably difficult test items.

• 한국철도학회논문집
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• 제14권6호
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• pp.515-525
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• 2011

도시형 자기부상열차 실용화사업에 적용된 유도무선루프방식 열차제어시스템에 대하여 최상위 레벨에서 전체 시스템에 대한 시스템 분류, 기능 분석을 시행하고 차상신호설비, 지상신호설비로 나누어 신뢰도, 가용도, 유지보수도 및 안전도를 수식을 통하여 분석한 결과를 제시하였다. RAM 분석은 신뢰도 블록도(RBD)를 각 장치별로 적용하여 시스템 서비스 가용도를 산출하였고, 안전도 분석은 PHA(예비위험원 분석), FMEA (고장모드영향분석), HAZOP을 통한 각각의 정상사상(Top Event)의 FTA(고장트리분석)을 시행하고 그 결과를 제시하여 RAMS 목표 값에 도달함을 수식을 통하여 증명하였다.

• 반도체디스플레이기술학회지
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• 제20권2호
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• pp.126-130
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• 2021

The ball grid array is one of the packaging methods that used in high density printed circuit board. Solder void defects caused by voids in the solder ball during the BGA process do not directly affect the reliability of the product, but it may accelerate the aging of the device on the PCB layer or interface surface depending on its size or location. Void inspection is important because it is related in yields with products. The most important process in the optical inspection of solder void is the segmentation process of solder and void. However, there are several segmentation algorithms for the vision inspection, it is impossible to inspect all of images ideally. When X-Ray images with poor contrast and high level of noise become difficult to perform image processing for vision inspection in terms of software programming. This paper suggests the solution to deal with the suggested problem by means of using Mask R-CNN instead of digital image processing algorithm. Mask R-CNN model can be trained with images pre-processed to increase contrast or alleviate noises. With this process, it provides more efficient system about complex object segmentation than conventional system.

• 한국의류학회지
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• 제46권5호
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• pp.723-740
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• 2022

This study aimed to develop an Arduino-based garment pressure device (APD) on the basis of using Single-Tact sensor by suggesting the reliable clothing pressure range and coefficient of selected sensors through the APD calibration process. Once the APD was validated, the pressure of the experimental men's lower body compression wears was measured using the APD and was compared to the pressure measured using the existing air-pack type pressure meter. The subjects were one mannequin and eight men in their 20's, and the trial compression wears were calf sleeves and pants. Clothing pressures were measured in hip, mid-thigh, calf, and ankle. In terms of the 99% confidence level, the experimental clothing pressure measured at the designated measuring points using the APD was considered identical to the one measured using an existing clothing pressure meter. Therefore, on the basis of the experiment results, this study demonstrated that the APD is as reliable as the existing clothing pressure meter within the pressure ranges of 0.54-16.79 kPa and 0.18-25.47 kPa as provided by the SingleTact sensor supplier's data on the basis of using an external ADC (Analog to Digital Converter) module.

• 대한지역사회영양학회지
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• 제17권1호
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• pp.26-37
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• 2012

This study was done to analyze the consumption patterns of health functional food (HFF) as well as to perform needs assessment for the development of web-contents on HFF according to age of adults. The subjects were 238 male and female adults, divided into 4 groups by their age. This study collected all information by self-administrated questionnaires. The awareness on HFF was high in the older adults. The younger adults showed more negative responses to reliability and safety on HFF. The main reason for the consumption of HFF was to supplement nutrients and to prevent diseases. The main types of HFF consumed by adults were nutritional supplementary food, red ginseng products, and glucosamine products. There was higher consumption of nutritional supplementary food in the younger adults and glucosamine products in the older adults. Internet users had low level of satisfaction, with tendency to complain poor contents, reliability, difficulties in searching as problems of the pre-existing HFF websites. As useful methods for provision of information on HFF, most adults wanted general information, articles written by experts and videos. They also wanted to know the safety and side effects of HFF. Requirement of contents composition were various in-depth information, clear indication of citation, fresh updated data while that of display composition was easily-findable, uncomplicated, allowing mutual exchange of communication through bulletin board. These results can be used as basic data that reflect the consumer's needs for developing HFF web-contents according to age of adults.