• Title/Summary/Keyword: Device

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Comparison of Accuracy and Output Waveform of Devices According to Rectification Method (정류방식에 따른 장치의 정확도와 출력 파형의 비교)

  • Lee, In Ja
    • Journal of radiological science and technology
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    • v.41 no.6
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    • pp.603-610
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    • 2018
  • This study examined the following: accuracy of the exposure conditions in the inverter device and three-phase device; output waveform over the exposure conditions; and average and standard deviation of the output waveform. After assessing whether the dose corresponding to the theoretical dose was presented, the following conclusions were obtained: 1. The accuracy of the tube voltage(kVp) and tube current(mA) exposure time(sec) was within the tolerable level prescribed in Korea's Safety Management Standards. In the error, Inverter device was large the tube voltage and exposure time, the three-phase device was large the tube current. 2. In terms of the output waveform of the exposure conditions and the average and standard deviation of the output waveform, the higher tube voltage and larger tube current resulted in greater standard deviation in pulsation. Moreover, the standard deviation of pulsation was shown to be greater in the inverter device than the three-phase device; there was also greater standard deviation in the inverter device considering the exposure time. 3. Regarding the exposure conditions over the output dose, all linearity showed the coefficient of variation which had an allowable limit of error within 0.05. Although the output dose ratio for the inverter device was 1.00~1.10 times no difference that of the three-phase device, there was almost no difference in dose ratio between the tube currents.

Study for Mechanical and Physicochemcial Properties of Silicone Gel Filled Mammary Implants (실리콘겔 인공유방의 기계적 및 물리화학적 특성에 대한 연구)

  • Baek, H.;Jang, D.H.;Song, J.M.;Lee, S.Y.;Seo, M.Y.;Park, G.J.;Maeng, E.H.
    • Journal of Biomedical Engineering Research
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    • v.33 no.2
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    • pp.89-97
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    • 2012
  • The purpose of this study is to develop the guideline of the physicochemical and mechanical properties evaluation for silicone gel filled breast implants. First of all, the use and development status for silicone gel filled breast implants were investigated, and then, standard and criteria about performance evaluation established by the international organizations such as ASTM, FDA guidance and ISO were examined. To evaluate the mechanical properties, data research and testing for breaking strength, elongation, tensile set, joint intensity, silicone gel cohesion, weight loss from heating, static rupture resistance, impact resistance test, fatigue test, and gel bleed were performed. On the other hand, to evaluate the physicochemical properties, volatile matter, extent of cross linking, heavy metals, and extractable were analyzed. In this study, results for general function, mechanical properties and physicochemical properties were examined and reviewed for the accordance with international standard, and objective and standardized guideline was provided.

A survey about the use of oral hygiene device and awareness some of the middle age people (일부 중·장년층의 구강위생용품 인지와 사용실태)

  • Jung, Gi-Ok
    • Journal of Korean society of Dental Hygiene
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    • v.9 no.4
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    • pp.580-592
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    • 2009
  • Objectives : This study had been performed for Respondents who live in Daegu and Kyungbuk province Age group of 30 to 50 years old. Methods : The oral health state and oral heath care, dental treatments about the use of oral hygiene devices were obtained through self-administering questionnaires from 2 to 31, January, 2009. Results : 1. The toothpick was well known for respondents and automatic brush, gargle, dental floss were practically used. 2. 57.1% of man know oral hygiene device, they know more about oral hygiene device if they have higher degree, and they use more if they are older than others. 3. 55.5% of respondents who think their oral health condition is not healthy enough recognize oral hygiene device, 77.5% of respondents who visited dental clinic around six month recognize oral hygiene device. 82.4% of respondents who had been follow-up. 86.1% of respondents who think their oral health state is good enough doesn't use oral hygiene device, oral hygiene device was used more for respondents who visited dental clinic frequently. 47.1% of respondents who visited dental clinic periodically use oral hygiene device. 4. Respondents who experience implant recognize more about oral hygiene device and periodontal Tx, orthodontics problem, preservative treatment were next. 5. 60.0% of respondents who were educated tooth brushing method recognize it. Oral hygiene device was frequently used if tooth brushing time were increased. 26.4% of respondents who were changed their tooth brushing method used oral hygiene device. Conclusions : Their recognition level was practically low whose age is around 30 to 50. Their oral hygiene device use ratio is higher then others who were educated tooth brush method so that I think we need to recommend for use oral hygiene device and use method.

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A Scheme for Detecting and Preventing an Unauthorized Device Using Context Awareness and Mobile Device Management (상황 인지 기술과 모바일 단말 관리 기술을 이용한 비인가 단말 탐지 및 차단 기법)

  • Mun, Jiman;Jung, Souhwan
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.39C no.1
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    • pp.1-8
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    • 2014
  • This paper proposed a method that prevents data leakage and modulation and detects an unauthorized device by using AP and mobile device. Most of existing method for detecting and preventing an unauthorized device are similar to type of Evil Twin. However, in previous studies can not resolve many security accident and have the problem to cope with effectively security accident on various network. In order to solve these problem, companies prepare security accident through the varies policy and guideline. but It is hard to prevent all security accident because it is consistently increasing everyday. This paper suggests technique of detecting and preventing an unauthorized device using Context Awareness and Mobile Device Management. Firstly, when mobile device go into internal network, server distinguish access permission and authorization of mobile device using acquiring the conetxt information of mobile device. By using this result, server applies the appropriate management technique to the mobile device for leakage and accident of internal network.

Perspective Diversity of Domestic Stakeholders on Medical Device Adverse Event Reporting (의료기기 이상사례 보고에 대한 국내 이해관계자의 관점 차이)

  • Lee, Ye Jin;Yoon, Chiho;Choi, Soo Jeong;Kang, Youngjoon;Kim, Jin Kuk;Kwon, Bum Sun;Lee, You Kyoung;Nam, Ki Chang
    • Journal of Biomedical Engineering Research
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    • v.40 no.5
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    • pp.171-178
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    • 2019
  • This study was conducted to observe the differences in perspective of medical device adverse events and report exchange for domestic stakeholders. The post-market surveillance of medical device not only improves the usability and functionality of the device but also identifies new or growing risks caused by the device. APEC (Asia-Pacific Economic Cooperation) have established and operated post-market surveillance systems for medical devices based on IMDRF (International Medical Device Regulators Forum) and GHTF (Global Harmonization Task Force) guidelines. However, there are significant gaps in many aspects. It is essential to apply harmonized guidelines internationally but also to interpret and apply the guidelines consistently to report and exchange medical device adverse event in domestic. This study retrospectively analyzed the results of surveys conducted by providing examples of the adverse events and guidelines for post-market surveillance. The results of the study showed that there was a considerable difference in the judgment on the phase of using medical device for patient. In the case of medical device adverse event, different opinions shown according to knowledge and experience. Education and training are needed to have a harmonized perspective on the reporting and exchanging international guidelines of the adverse event for domestic stakeholders.

Development and feasibility test of sit-to-stand transfer assistive device

  • Ha, SinHo;Jeong, SeYeon;Hong, SoungKyun;Choi, Wonjae;Lee, Kwangkook;Park, Donghwan;Son, SangJun;Shin, HyeonHui;Lee, GyuChang
    • Journal of Korean Physical Therapy Science
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    • v.29 no.1
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    • pp.41-46
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    • 2022
  • Background: The purpose of this study was to develop a sit-to-stand transfer assistive device, and to conduct a feasibility test. Design: A technical note. Methods and results: In this study, we developed a sit-to-stand transfer assistive device for the elderly and the disabled who have difficulty standing up independently from sitting positions. The sit-to-stand transfer assistive device allows the user to transfer the weight from a sitting position to a standing position while shifting the weight forward by grabbing and pulling a support stand. Ten healthy adults participated in the feasibility test of the device. Each participant used the developed sit-to-stand transfer assistive device and investigated supplementation through a brief interview. As a result of the feasibility test, the opinion was that the device could assist the sit-to-stand transfer to some extent. There were opinions that it needed a function to adjust the height of the knee protective plate in the sitting position according to the user's physical characteristics. Because of the inconvenience of operating the lock device for fixing the position and adjusting inclination, there was an opinion that the improvement for a locking device is needed. There were opinions that it would be better to reduce the size of the device due to its inconvenience of portability. Conclusion: In this study, we developed the sit-to-stand transfer assistive device for the elderly and the disabled who have difficulty standing up independently from sitting positions. In addition, it is considered that the upgrade of the device is necessary for the future since there are supplementary opinions on some points.

A Study on the Improvement of Domestic Medical Device Classification System through the Analysis of Major Foreign Countries (주요국의 의료기기 품목 분류체계 조사분석을 통한 국내 의료기기 품목 신설 및 세분화 연구)

  • Ji Min, Son;Kang Hyeon, You;You Rim, Kim; Gyeong Min, Kwon;Hui Sung, Lee;Won Seuk, Jang
    • Journal of Biomedical Engineering Research
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    • v.44 no.1
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    • pp.41-52
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    • 2023
  • With the international change in the medical device market owing to the development of innovative medical engineering and the use of various raw materials, a systematic and rational medical device classification system is needed to safely manage newly developed medical devices. This study aims to improve the domestic medical device classification system by proposing product establishment and segmentation. It is based on medical device products from the United States and Europe that are only available in foreign systems and are more subdivided than domestic products. This study analyzes and compares the domestic and foreign medical device classification systems by examining laws, guidelines, and analysis reports in Korea, the United States, and Europe. In accordance with product establishment and segmentation criteria, products subject to improvement are presented. This study contributes to safely managing medical devices that do not fit with the current classification system and to solving the confusion caused by the lack of international harmony in product classification systems.