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You searched for subject:(portable medical device). Showing records 1 – 3 of 3 total matches.

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NSYSU

1. Huang, Hao-Chun. A Highly Sensitive Portable Microsystem for Rapid Marijuana Detection and A Peak Detector with Offset Cancellation.

Degree: Master, Electrical Engineering, 2018, NSYSU

As early as in the 1960s, drugs abuse has long been a serious problem in the world.The most popular one is marijuana, where 160 million people (79.4%) were reported to have addiction issues. The side effect is posed upon both mental and physical aspects.For instance, high heart beat rate, low blood pressure, short-term and working memory breakdown, coordination and concentration loss. It will lead to dangers during work, driving, and daily life. Thus, marijuana testing has become as urgent as that for alcohol. The first topic of this thesis proposes a highly sensitive portable microsystem for rapid marijuana detection, which is integrated with flexural plate wave microsonic sensor (FPW sensor). The system uses a single battery cell as the system power, and utilizes a direct digital frequency synthesizer (DDFS) to generate a frequency scanning signal, amplitude voltage converters, signal amplification circuits, and peak detectors, etc. The FPW sensor senses the resonance frequency shift caused by different concentrations of cannabinoid protein. It acquires the frequency, which is read by the control circuit and displayed on the MCU. The linearity by physical experiments is up to 0.9992, and the maximum error is 12.378 KHz. The system is featured with no need for extra power supply, small size, fast detection, simple operation, which meets the demand of modern portable medical devices. The second topic is to improve the accuracy of the peak detector circuit in the first topic. The peak detector uses an operational amplifier and a feedback circuit to compare the captured peak voltage automatically. Due to the mismatch of amplifierâs input stage, an input offset voltage will be generated to deteriorate the accuracy of the peak voltage acquisition. Therefore, the dynamic offset voltage cancellation technology is adopted,where the offset voltage is modulated to a higher frequency. Thus, the offset voltage is eliminated by using a low pass filter to increase the accuracy of the captured peak voltage. The input range is 0 V ~ 2.802 V and the precision can be as low as 0.558 mV as well as the offset voltage can be reduced to 0.3 mV by the simulations. The input range of previous work is 0 V ~ 1.985 V and the precision can be as low as 36.8 mV by measurement results. Advisors/Committee Members: Ko-chi Kuo (chair), Ming-Der Shieh (chair), Chua-Chin Wang (committee member), JIh-ching Chiu (chair).

Subjects/Keywords: peak detector; portable medical device; flexural plate wave microsonic sensor; resonant frequency shift; dynamic offset voltage cancellation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Huang, H. (2018). A Highly Sensitive Portable Microsystem for Rapid Marijuana Detection and A Peak Detector with Offset Cancellation. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0629118-213302

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Huang, Hao-Chun. “A Highly Sensitive Portable Microsystem for Rapid Marijuana Detection and A Peak Detector with Offset Cancellation.” 2018. Thesis, NSYSU. Accessed August 09, 2020. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0629118-213302.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Huang, Hao-Chun. “A Highly Sensitive Portable Microsystem for Rapid Marijuana Detection and A Peak Detector with Offset Cancellation.” 2018. Web. 09 Aug 2020.

Vancouver:

Huang H. A Highly Sensitive Portable Microsystem for Rapid Marijuana Detection and A Peak Detector with Offset Cancellation. [Internet] [Thesis]. NSYSU; 2018. [cited 2020 Aug 09]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0629118-213302.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Huang H. A Highly Sensitive Portable Microsystem for Rapid Marijuana Detection and A Peak Detector with Offset Cancellation. [Thesis]. NSYSU; 2018. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0629118-213302

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. HONG, XIANGQIAN. Dual-modality Smartphone-based Fiber-optic Microendoscope System for Early Detection of Cervical Neoplasia.

Degree: 2019, Marquette University

Cervical cancer remains the leading cause of death for women in low middle-income countries (LMICs), where the incidence and mortality of cervical cancer are disproportionately high. Due to the poor medical conditions and lack of resources, the benefits of early screening methods such Pap smear and HPV test have yet to be realized in these areas. The more viable screening option - visual inspection with acetic acid (VIA) is relatively easier to implement and lower in cost. However, the effectiveness of VIA on the early detection of cervical cancer is still in question because of its low specificity, which may lead to many unnecessary follow-up diagnoses and treatments.Optical endoscopy is a powerful tool for detecting pre-cancerous changes in the epithelial tissue of the cervix. In this dissertation, we report the design and development of a dual-modality fiber-optic microendoscope system (SmartME) that integrates high-resolution fluorescence imaging (FLI) and quantitative diffuse reflectance spectroscopy (DRS) onto a smartphone platform. A smartphone App has also been developed to control the SmartME, pre-process the data, and wirelessly communicate with a remote server where the image and data are processed to extract diagnostically meaningful tissue parameters. The SmartME device has been thoroughly tested and calibrated. The FLI has a spatial resolution of ~3.5 µm, which allows imaging of subcellular organelles and determining the nuclear-cytoplasmic ratio of epithelial tissues. The DRS has a spectral resolution of 2 nm and is capable of measuring optical properties of epithelial tissues with a mean error of ~5%, which is comparable to what can be achieved with a commercial spectrometer. The feasibility of the device in measuring biological samples has been verified ex vivo using monolayer cervical cancer cells, tumor tissue from xenograft solid tumor models and other normal tissues. In vivo study on healthy human oral mucosa tissues has demonstrated that the SmartME can noninvasively quantify the tissue parameters and distinguish between different tissue types. The SmartME may provide a compact, cost-effective, and globally connected solution for early detection of neoplastic changes in epithelial tissues. Advisors/Committee Members: Yu, Bing, Audi, Said H., Schmidt, Taly Gilat.

Subjects/Keywords: Cervical Cancer Screening; Diffuse Reflectance Spectroscopy; Fiber-optic Endoscopy; Fluorescence Imaging; Portable Medical Device; Telemedicine and Mobile Health; Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

HONG, X. (2019). Dual-modality Smartphone-based Fiber-optic Microendoscope System for Early Detection of Cervical Neoplasia. (Thesis). Marquette University. Retrieved from https://epublications.marquette.edu/dissertations_mu/883

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

HONG, XIANGQIAN. “Dual-modality Smartphone-based Fiber-optic Microendoscope System for Early Detection of Cervical Neoplasia.” 2019. Thesis, Marquette University. Accessed August 09, 2020. https://epublications.marquette.edu/dissertations_mu/883.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

HONG, XIANGQIAN. “Dual-modality Smartphone-based Fiber-optic Microendoscope System for Early Detection of Cervical Neoplasia.” 2019. Web. 09 Aug 2020.

Vancouver:

HONG X. Dual-modality Smartphone-based Fiber-optic Microendoscope System for Early Detection of Cervical Neoplasia. [Internet] [Thesis]. Marquette University; 2019. [cited 2020 Aug 09]. Available from: https://epublications.marquette.edu/dissertations_mu/883.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

HONG X. Dual-modality Smartphone-based Fiber-optic Microendoscope System for Early Detection of Cervical Neoplasia. [Thesis]. Marquette University; 2019. Available from: https://epublications.marquette.edu/dissertations_mu/883

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

3. Alshaer, Hisham. A Single-Channel Acoustic Method for Portable Diagnosis of Sleep Apnea.

Degree: 2014, University of Toronto

Background: Sleep apnea is a very common disease with serious health consequences. It affects approximately 85% of adults, most of whom remain undiagnosed, which puts them at risk of car accidents, because of sleepiness, and hypertension, heart failure, and stroke. The objective of this thesis was to develop a single-channel device for portable monitoring of sleep apnea that uses breath sounds collected via a microphone placed in front of the nose and mouth. Methods: Project 1: Frequency characterization was used to identify the basic components of the respiratory cycle, i.e., inspiration and expiration. Project 2: Inspiratory sounds were used to determine upper airway narrowing by means of Linear Predictive Coding (LPC), which was validated against objective measures of upper airway resistance. Project 3: An algorithm to calculate the frequency of apneas and hypopneas per hour (apnea-hypopnea index or AHI) was developed and validated against polysomnography in 50 subjects during sleep. Project 4: Finally, a self contained device was then developed and evaluated in 49 subjects in the home setting, 11 of whom used the device on 2 different nights. Results: Project 1: Inspiratory and expiratory phases had characteristically different spectra that allowed them to be distinguished with up to 97% correct classification. Project 2: LPC coefficients were found to be modulated by the ensuing of upper airway narrowing. Project 3: AHI determined by acoustic analysis showed up to 94% correlation with PSG and up to 90% diagnostics accuracy. Project 4: In the home unattended setting, the overall rating for ease-of-use was excellent and the success rate of independent use was 94%. The portable device showed excellent performance with very high signal-to-noise ratio of 31.7 dB. The intra-subject 2-night AHI scores were reproducible in 9 out of 11 (82%) home subjects, which is well within reported inter-night variability. Conclusion: Acoustic analysis of breath sounds is a powerful tool for characterization of respiratory patterns including upper airway narrowing and accurate identification of apneas and hypopneas as compared with the current gold standard. This technology can be packaged in a compact device that can be used independently and reliably in the home environment.

PhD

Advisors/Committee Members: Fernie, Geoff R, Bradley, T Douglas, Biomedical Engineering.

Subjects/Keywords: Sleep Apnea; Portable Diagnosis; Acoustics; Medical Device; Signal Processing; Algorithm; Upper Airway; Breathing Phases; Usability; Embedded Module; 0541; 0986; 0564

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Alshaer, H. (2014). A Single-Channel Acoustic Method for Portable Diagnosis of Sleep Apnea. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/68884

Chicago Manual of Style (16th Edition):

Alshaer, Hisham. “A Single-Channel Acoustic Method for Portable Diagnosis of Sleep Apnea.” 2014. Doctoral Dissertation, University of Toronto. Accessed August 09, 2020. http://hdl.handle.net/1807/68884.

MLA Handbook (7th Edition):

Alshaer, Hisham. “A Single-Channel Acoustic Method for Portable Diagnosis of Sleep Apnea.” 2014. Web. 09 Aug 2020.

Vancouver:

Alshaer H. A Single-Channel Acoustic Method for Portable Diagnosis of Sleep Apnea. [Internet] [Doctoral dissertation]. University of Toronto; 2014. [cited 2020 Aug 09]. Available from: http://hdl.handle.net/1807/68884.

Council of Science Editors:

Alshaer H. A Single-Channel Acoustic Method for Portable Diagnosis of Sleep Apnea. [Doctoral Dissertation]. University of Toronto; 2014. Available from: http://hdl.handle.net/1807/68884

.