• Title/Summary/Keyword: 측정표준기술

Search Result 931, Processing Time 0.03 seconds

Functional disposable use flow tube converting the respiratory air flow rate into averaged dynamic pressure (호흡기류를 동압력으로 변환하는 기능성 일회용 호흡관)

  • Kim, Kyung-Ah;Kim, Hyun-Shik;Lee, Tae-Soo;Cha, Eun-Jong
    • Journal of Sensor Science and Technology
    • /
    • v.11 no.3
    • /
    • pp.125-131
    • /
    • 2002
  • Respiratory air flow rate is necessarily measured for the pulmonary function evaluation. The currently used devices are exposed to the problems of measurement reliability and cross-patient infection. The present study introduced a new technique which converted the bidirectional air flow rate into averaged dynamic pressure based on the famous Bernoulli's energy conservation principle. Single use plastic sensing element was assembled within the flow tube(mouth piece) made of paper, which was named "functional single use flow tube". Experiment demonstrated only ${\pm}1.5%$ relative error in the standard 3L volume measurement procedure well within the error limit suggested by the American Thoracic Society(ATS). Disposable use design completely eliminated cross-patient infection. The present device is best useful and safe for clinical respiratory air flow measurement such as spirometry.

The Effect of Low Power Laser Therapy on Facial Skin Melanin and Elasticity (저출력 레이저 요법이 안면피부 탄력도와 멜라닌 양에 미치는 효과)

  • Ahn, Kyung-Min;Kim, Ye-Jean
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.12 no.12
    • /
    • pp.5805-5810
    • /
    • 2011
  • This study aims to provide fundamental data to develop anti-aging programs in the aspect of skin care. To attain the goal, manual therapy and low-power laser therapy were conducted separately to 8 women inthe 40's and 50's. They received the facial massage total 8 times twice a week for 4 weeks. According to the result of calculating the average and standard deviation by measuring skin elasticity of the area below their eyes and cheeks and also melanin around eyes and cheeks and conducting comparative analysis, both groups showed significant increase in elasticity and their melanin decreased significantly. The low-power laser therapy showed higher values than the manual therapy both in elasticity increase and melanin reduction; thus, it was analyzed that the low-power laser therapy more highly affects skin elasticity and the amount of melanin in facial skin is greater than that in manual therapy. Therefore, it was analyzed that skin care using low level laser can be significant in anti-aging of facial skin and can be utilized as a program for a new type of skin care.

Measuring the Relative Risk Aversion Coefficients of Apple Farmers (사과 농가의 상대위험회피계수 추정)

  • Lin, Qing-Long;Yeo, Jun-Ho;Kim, Tae-Kyun
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.16 no.2
    • /
    • pp.1036-1044
    • /
    • 2015
  • This paper estimates the relative risk aversion coefficients of apple farmers. Two hypothetical situations are designed and two-stage questionnaires are conducted for each situation. A utility function that has constant relative risk aversion was used, and it was assumed that the relative risk aversion coefficients follow a log-normal distribution. To reduce the hypothetical bias, the data was collected from repetitive questions. As a result, the mean and standard deviation of the relative risk aversion coefficients of apple farmers was 10.915 and 7.516, respectively. The relative risk aversion coefficients conditional on a survey response in each category were also measured. These findings can be used as parameters to analyze the effects of risk management tools.

CT Densitometry of Normal Tissue and Mass of Lung according to Reconstruction Algorithm (재구성 연산 방식에 따른 흉부의 정상 조직과 종괴의 CT 밀도 측정)

  • Yoon, Han-Sik
    • Journal of radiological science and technology
    • /
    • v.25 no.2
    • /
    • pp.39-45
    • /
    • 2002
  • Fifty patients with lung mass were studied to evaluate the effect of reconstruction algorithm on the CT number of lung mass and normal thoracic tissues. In each examination, the CT image of the lung mass was reconstructed using soft, standard, detail and bone algorithm. The results were shown as follows 1. the average maximum difference of lung mass density on the ROIs using 4 different algorithms was less than 1HU. 2. The maximum difference in the degree of lung mass enhancement was respectively $0.1{\sim}3.2HU$ (ROI $0.5\;cm^2$), $0.1{\sim}2.8HU$(ROI $3\;cm^2$) and $0.0{\sim}2.1$(ROI $6\;cm^2$). 3. The mean density of the normal thoracic tissues was highest in the bone algorithm, though there was no significant between 4 different reconstruction algorithms(p = 1.00).

  • PDF

A Statistical compare analysis of bone mineral density of lumbar spine and femur, Risk Factors for Osteoporosis in the women of pre, postmenopausal (폐경전,후 여성에서 골다공증의 위험요인과 요추와 대퇴골의 골밀도 비교분석)

  • Lee, Won-Jeong;Ki, No-Weon
    • Journal of radiological science and technology
    • /
    • v.28 no.3
    • /
    • pp.227-234
    • /
    • 2005
  • - Objective Osteoporosis is one of the characteristic adult diseases, high prevalence, many complications, easy fracture, important health problem. this study, compared analysis BMD data of the lumbar spine and femur - Methods For the 100 female patients,

  • PDF

내용기반 웹 서비스 검색 엔진의 개발

  • Son, Seung-Beom;Lee, Gyu-Cheol
    • Proceedings of the Korea Society of Information Technology Applications Conference
    • /
    • 2006.06a
    • /
    • pp.656-699
    • /
    • 2006
  • 웹 서비스는 사용자가 다양한 인터페이스 정의와 교환 메시지 형식을 가지는 서비스를 개발하는데 있어 보다 효과적이고 단일화된 방법을 제공한다. 웹 서비스에서 인터페이스 정의와 교환 메시지 형식은 WSDL 통해 정의되며, 이 WSDL 문서를 통해 이용할 서비스의 인터페이스와 교환 메시지 형식을 파악하여 빠르게 해당 서비스를 이용할 수 있도록 한다. 이러한 웹 서비스의 등록과 검색을 위해서는 레지스트리 방식을 이용한다. 개발된 서비스에 관한 설명 정보는 서비스 제공자에 의해 작성되어 레지스트리에 등록되며, 서비스 요청자는 레지스트리로부터 필요한 서비스를 검색하여 이용한다. UDDI는 웹 서비스를 위한 분산 레지스트리 표준으로 웹 서비스를 위한 등록과 검색 메커니즘을 제공한다. UDDI에서 지원하는 검색 메커니즘은 크게 키워드 검색과 비즈니스와 서비스에 대한 카테고리별 검색으로 구분된다. 키워드 기반 검색은 SQL LIKE 연산을 통해 비즈니스와 서비스의 이름에 대하여 부분 문자열이 일치하는지 검사하는 방식으로 이루어진다. 이러한 UDDI 의 키워드 기반 검색은 등록된 서비스의 이름 이외의 내용 정보에 대한 검색을 지원하지 못하므로 효과적인 검색을 지원하지 못하는 단점을 가진다. 또한 UDDI는 WSDL 문서의 내용에 대한 검색은 지원하지 못하는 단점을 가진다. 이에 따라 현대의 서비스 검색은 서비스의 이름에 대한 검색만을 지원한다. 이러한 현재의 웹 서비스 검색에서의 문제점을 해결하기 위해서는 UDDI 에 등록된 설명 정보와 WSDL 문서 모두에 대한 내용 기반의 검색을 지원하고 검색 결과를 순위화 (ranking)하여 제시할 수 있는 검색 엔진이 요구된다. 이 논문은 이러한 문제점들을 해결할 수 있도록 내용 기반 검색을 지원할 수 있는 웹 서비스를 위 한 검색 엔진을 제안한다. 제안한 검색 엔진은 UDDI 등록 정보에 대하여 내용 기반 검색을 수행할 수 있도록 벡터 공간 모델을 활용한 유사도 비교 방법을 이용한다. 또한 UDDI 등록 정보 외에 실질 적인 서비스의 인터페이스와 교환 메시지 형식에 대한 비교의 수행을 위하여 WSDL 문서에 대한 유사도 비교를 수행한다. 유사도 측정시 UDDI 등록 정보와 WSDL 문서와 같은 계층적인 문서 구조를 검색 결과에 반영할 수 있는 방법을 지원한다. 지원하는 검색 방법은 두 가지로 키워드 검색과 함께 텀플릿 검색을 지원한다. 템플릿 검색은 서비스의 등록 정보 외에 인터페이스 정의가 얼마나 일치하는지를 비교하기 위해 WSDL 문서에 대한 유사도를 비교할 수 있도록 한다. 이러한 검색의 지원을 통해 제안한 웹 서비스를 위한 검색 엔진은 기존의 레지스트리를 이용한 검 색 방법보다 정확한 검색 결과를 제공한다.

  • PDF

Influencing Factors of University Research Grant: Focusing on the Management Capability of Industry-University Collaboration Foundation (대학 연구비 규모의 영향 요인 분석: 산학협력단의 연구비 관리 역량을 중심으로)

  • Jung, Hyejin
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.20 no.2
    • /
    • pp.483-491
    • /
    • 2019
  • The aim of this study is to shed light on factors that influence securing of university research grants. For this purpose, this study emphasizes the role of management capability of industry-university cooperation foundation in securing research grants. We analyze whether the potential capabilities influence research grants using panel data from 194 universities during 2016 to 2018. The results obtained from the Driscoll & Kraay standard errors (DKSE) indicate that a number of variables including the portion of industry-university collaboration professors, academic performance of professors, and the number of paid researchers are positively associated with the amount of external research grant approved. However, the percentage of employees employed for less than two years is negatively related with securing external research grants. Once the dependent variable is measured by the total university research grants, the negative coefficient of employees with short-term career disappears. Instead, the percentage of employees who are in charge of research planning and management and the total number of employees involved in industry-university collaboration foundations are negatively related with the total university research grant amounts.

A transport-history-based peer selection algorithm for P2P-assisted DASH systems based on WebRTC (WebRTC 기반 P2P 통신 병용 DASH 시스템을 위한 전달 이력 기반 피어 선택 알고리듬)

  • Seo, Ju Ho;Choi, Seong Hyun;Kim, Sang Jin;Jeon, Jae Young;Kim, Yong Han
    • Journal of Broadcast Engineering
    • /
    • v.24 no.2
    • /
    • pp.251-263
    • /
    • 2019
  • Recently the huge demand for Internet media streaming has dramatically increased the cost of the CDN (Content Delivery Network) and the need for a means to reduce it is increasing day by day. In this situation, a P2P-assisted DASH technology has recently emerged, which uses P2P (Peer-to-Peer) communications based on WebRTC (Web Real-Time Communication) standards to reduce the CDN cost. This paper proposes an algorithm that can significantly improve CDN cost savings in this technology by selecting peers based on the transport history. Also we implemented this algorithm in an experimental system and, after setting experimental conditions that emulate the actual mobile network environment, we measured the performance of the experimental system. As a result, we demonstrated that the proposed algorithm can achieve higher CDN cost savings compared to the conventional algorithm where peers are selected at random.

Development and Validation of AI Image Segmentation Model for CT Image-Based Sarcopenia Diagnosis (CT 영상 기반 근감소증 진단을 위한 AI 영상분할 모델 개발 및 검증)

  • Lee Chung-Sub;Lim Dong-Wook;Noh Si-Hyeong;Kim Tae-Hoon;Ko Yousun;Kim Kyung Won;Jeong Chang-Won
    • KIPS Transactions on Computer and Communication Systems
    • /
    • v.12 no.3
    • /
    • pp.119-126
    • /
    • 2023
  • Sarcopenia is not well known enough to be classified as a disease in 2021 in Korea, but it is recognized as a social problem in developed countries that have entered an aging society. The diagnosis of sarcopenia follows the international standard guidelines presented by the European Working Group for Sarcopenia in Older People (EWGSOP) and the d Asian Working Group for Sarcopenia (AWGS). Recently, it is recommended to evaluate muscle function by using physical performance evaluation, walking speed measurement, and standing test in addition to absolute muscle mass as a diagnostic method. As a representative method for measuring muscle mass, the body composition analysis method using DEXA has been formally implemented in clinical practice. In addition, various studies for measuring muscle mass using abdominal images of MRI or CT are being actively conducted. In this paper, we develop an AI image segmentation model based on abdominal images of CT with a relatively short imaging time for the diagnosis of sarcopenia and describe the multicenter validation. We developed an artificial intelligence model using U-Net that can automatically segment muscle, subcutaneous fat, and visceral fat by selecting the L3 region from the CT image. Also, to evaluate the performance of the model, internal verification was performed by calculating the intersection over union (IOU) of the partitioned area, and the results of external verification using data from other hospitals are shown. Based on the verification results, we tried to review and supplement the problems and solutions.

A Study on LNG Quality Analysis using a Raman Analyzer (라만분석기를 이용한 LNG 품질 분석 실증 연구)

  • Kang-Jin Lee;Woo-Sung Ju;Yoo-Jin Go;Yong-Gi Mo;Seung-Ho Lee;Yoeung-Chul Kim
    • Korean Chemical Engineering Research
    • /
    • v.62 no.1
    • /
    • pp.70-79
    • /
    • 2024
  • Raman analyzer is an analytical technique that utilizes the "Raman effect", which occurs when light is scattered by the inherent vibrations of molecules. It is used for molecular identification and composition analysis. In the natural gas industry, it is widely used in bunkering and tank lorry fields in addition to LNG export and import terminals. In this study, a LNG-specific Raman analyzer was installed and operated under actual field conditions to analyze the composition and principal properties (calorific value, reference density, etc.) of LNG. The measured LNG composition and calorific value were compared with those obtained by conventional gas chromatograph that are currently in operation and validated. The test results showed that the Raman analyzer provided rapid and stable measurements of LNG composition and calorific value. When comparing the calorific value, which serves as the basis for LNG transactions, with the results from conventional gas chromatograph, the Raman analyzer met the acceptable error criteria. Furthermore, the measurement results obtained in this study satisfied the accuracy criteria of relevant international standards (ASTM D7940-14) and demonstrated similar outcomes compared to large-scale international demonstration cases.