• International Journal of Reliability and Applications
• /
• 제8권1호
• /
• pp.67-82
• /
• 2007

This paper deals with the effectiveness analysis of an engineering system, which has two units of different strengths in parallel and one unit as a cold standby unit. Failure times for all the units have negative exponential distribution whereas their repair times have general distribution. Single server caters the need for the system. The effectiveness analysis of the system is done by using regenerative point technique. The different measures of effectiveness such as mean sojourn time, mean time to system failure, availability, busy period, etc, are derived. Cost factors also taken into consideration.

• 가정∙방문간호학회지
• /
• 제15권1호
• /
• pp.37-43
• /
• 2008

This paper provides the guidelines from which to develop a visiting health care program at the Public Health Center in Korea and involves an expanded payment compensation system of preventive services based on the new long-term health insurance system in Japan. The function and management methods to achieve the goals practiced in a community contact center for elderly support which have recently been established will guide the specific directions and strategies that the Public Health Center should pursue. That is to say, comprehensive and continuous efforts will be put forth in preventive home visiting care targeting the elderly in certain jurisdictions. At this point in time in which the visiting care nursing program has not yet started, visiting health care provided by the Public Health Center oversees chronic diseases of a vulnerable population. But after it has been developed nationwide, the visiting health care system at the Public Health Center will be distinctive and focused on health promotion and prevention.

• ETRI Journal
• /
• 제43권4호
• /
• pp.594-602
• /
• 2021

Recently, quantitative and repetitive inspections of the old urban area were conducted because many structures exceed their designed lifetime. The health of a building can be validated from the condition of the outer wall, while the slant angle of the wall widely serves as an indicator of urban regeneration projects. Mostly, the inspector directly measures the inclination of the wall or partially uses 3D point measurements using a static light detection and ranging (LiDAR). These approaches are costly, time-consuming, and only limited space can be measured. Therefore, we propose a mobile mapping system and automatic slant map generation algorithm, configured to capture urban environments online. Additionally, we use the LiDAR-inertial mapping algorithm to construct raw point clouds with gravity information. The proposed method extracts walls from raw point clouds and measures the slant angle of walls accurately. The generated slant angle map is evaluated in indoor and outdoor environments, and the accuracy is compared with real tiltmeter measurements.

• 한국정보통신학회논문지
• /
• 제12권12호
• /
• pp.2159-2164
• /
• 2008

유비쿼터스 헬스케어 시스템은 사용자의 건강 정보를 감독하고 관리하는 시스템이며, 이 헬스케어 시스템에서 가장 중요한 점은 측정된 건강 데이터의 정확성이다. 그러나 실생활에서는 사용자의 움직임 에 따라 그 정확성이 현저하게 달라진다. 따라서 건강 정보 정확성을 향상시키기 위해 본 연구에서는 심박수 추출에 있어 새로운 맥파 최대점 검출 알고리즘을 제안하였고, 제안된 알고리즘은 다중 하위 대역 필터와 퍼지 추론기를 이용하여 동잡음이 포함된 PPG 신호에서 맥파의 최대점을 검출하기 위한 것이다. 제안된 알고리즘에 대한 성능평가 실험에서 복잡한 동잡음에서도 맥파 최대점 추출이 가능함을 보였다.

• 한국의학물리학회:학술대회논문집
• /
• 한국의학물리학회 2002년도 Proceedings
• /
• pp.260-262
• /
• 2002

An accurate measurement of dose distribution is indispensable to perform radiation therapy planning. A measurement technique using a radiographic film, which is called a film dosimetry, is widely used because it is easy to obtain a dose distribution with a good special resolution. In this study, we tried to develop an analyzing system for the film dosimetry using usual office automation equipments such as a personal computer and an image scanner. A film was sandwiched between two solid water phantom blocks (30 ${\times}$ 30 ${\times}$ 15cm). The film was exposed with Cobalt-60 ${\gamma}$-ray whose beam axis was parallel to the film surface. The density distribution on the exposed film was stored in a personal computer through an image scanner (8bits) and the film density was shown as the digital value with NIH-image software. Isodose curves were obtained from the relationship between the digital value and the absorbed dose calculated from percentage depth dose and absorbed dose at the reference point. The isodose curves were also obtained using an Isodose plotter, for reference. The measurements were carried out for 31cGy (exposure time: 120seconds) and 80cGy (exposure time: 300seconds) at the reference point. While the isodose curves obtained with our system were drawn up to 60% dose range for the case of 80cGy, the isodose curves could be drawn up to 80% dose range for the case of 31cGy. Furthermore, the isodose curves almost agreed with that obtained with the isodose plotter in low dose range. However, further improvement of our system is necessary in high dose range.

• 한국가스학회지
• /
• 제24권6호
• /
• pp.11-17
• /
• 2020

인화성 액체 용액을 안전하게 저장하고 운반하기 위해서는, 인화점 정보를 알고 있는 것이 매우 중요하다. 이 논문에서는 n-octane+n-nonane 계와 n-nonane+n-decane 계의 인화점을 Seta flash 장치로 측정하였으며, 인화점을 정확하게 예측하기 위한 경험식을 제시한다. 경험식은 n-octane+n-nonane 계와 n-nonane+n-decane 계의 인화점을 예측하기 위해 사용되었으며, 또한 Unifac 식에 기반을 둔 계산 모델과 비교하였다. Unifac 식을 이용한 예측 결과의 절대평균오차는 n-octane+n-nonane 계의 경우 0.7℃였고, n-nonane+n-decane 계의 경우 0.6℃이었다. 경험식에 의한 예측값의 절대평균오차는 n-octane+n-nonane 계의 경우 0.2℃였고, n-nonane+n-decane 계의 경우 0.4℃이었다. 결론적으로, 본 논문에서 제시된 경험식은 매우 만족한 결과를 나타내었다.

• 대한물리의학회지
• /
• 제18권4호
• /
• pp.47-55
• /
• 2023

PURPOSE: This study compared the preferences of students majoring in physical therapy (PT) and those of physical therapists regarding various PT fields. METHODS: Two hundred and sixty-two participants (students: 161, physical therapists: 101) were recruited, and their preferences for seven fields of the PT (musculoskeletal system, nervous system, children and adolescents, cardiopulmonary system, sports, and pelvic and women's health) were surveyed using a Likert five-point scale. An independent t-test was conducted to compare the preference scores of each field between the PT student and physical therapist groups. RESULTS: PT for the musculoskeletal system was the most preferred by PT students and physical therapists. In contrast, PT for children and adolescents had the lowest preference. A comparison of the preferences of various PT fields in the two groups revealed PT students to have a significantly higher preference for PT on the musculoskeletal system, children and adolescents, and the nervous system compared with the physical therapists. CONCLUSION: These results could provide the basic information for various PT fields.

• 한국의학물리학회지:의학물리
• /
• 제28권3호
• /
• pp.111-121
• /
• 2017

Verification of dose distribution is an essential part of ensuring the treatment planning system's (TPS) calculated dose will achieve the desired outcome in radiation therapy. Each measurement have uncertainty associated with it. It is desirable to reduce the measurement uncertainty. A best approach is to reduce the uncertainty associated with each step of the process to keep the total uncertainty under acceptable limits. Point dose patient specific quality assurance (QA) is recommended by American Association of Medical Physicists (AAPM) and European Society for Radiotherapy and Oncology (ESTRO) for all the complex radiation therapy treatment techniques. Relative and absolute point dose measurement methods are used to verify the TPS computed dose. Relative and absolute point dose measurement techniques have a number of steps to measure the point dose which includes chamber cross calibration, electrometer reading, chamber calibration coefficient, beam quality correction factor, reference conditions, influences quantities, machine stability, nominal calibration factor (for relative method) and absolute dose calibration of machine. Keeping these parameters in mind, the estimated relative percentage uncertainty associated with the absolute point dose measurement is 2.1% (k=1). On the other hand, the relative percentage uncertainty associated with the relative point dose verification method is estimated to 1.0% (k=1). To compare both point dose measurement methods, 13 head and neck (H&N) IMRT patients were selected. A point dose for each patient was measured with both methods. The average percentage difference between TPS computed dose and measured absolute relative point dose was 1.4% and 1% respectively. The results of this comparative study show that while choosing the relative or absolute point dose measurement technique, both techniques can produce similar results for H&N IMRT treatment plans. There is no statistically significant difference between both point dose verification methods based upon the t-test for comparing two means.

• International Journal of Advanced Culture Technology
• /
• 제1권1호
• /
• pp.1-5
• /
• 2013

This network system for home care realized communication by the bio-physical signal, to convey physical rhythm. Four function of displacement had point of a Vision, Somatosensory, Vestibular and CNS. Bio-physical signal was decided to design a maximum points and minimum points with 0.01unit in reference level. Bio-physical signal was checked to compound physical condition of body posture for sensory organ. There detected a measurement of Vision, Somatosensory, Vestibular, CNS and BMI. The service of network system of home can be used to support a health care system for health assistant in health care center. It will expect to manage a physical parameter for network communication.

• 보건행정학회지
• /
• 제28권3호
• /
• pp.301-307
• /
• 2018

The development of transport is being easily shared with people all over the world. It is necessary to appropriately and effectively revise the domestic quarantine law because the fatal infectious diseases are at risk of being easily shared. Today, Korea has an advanced quarantine system approved by World Health Organization, but it maintains partnerships with related ministries (Ministry of Foreign Affairs, Ministry of Justice, local medical institutions) and to introduce new medical technology (electronic quarantine) is important. And since the prevention of quarantine infectious diseases and prevention of the spread, in order to maintain international cooperation with the International Health Regulations, the quarantine law and the system should be amended and improved effectively and it is also a way to prepare for the outbreak of new quarantine infectious diseases. In the past, Korea has experienced great confusion during the past outbreak of swine flu and Middle East respiratory syndrome coronavirus. To prevent similar cases from recurring in the past, the revision of the quarantine law and the improvement of the system should be done to cope with the changing environment (new infections, increased number of overseas travelers, etc.).