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Application of Inertial Measurement Units for angular motion detection

Application of Inertial Measurement Units for angular motion...

7th International Convention on Rehabilitation engineering and Assistive Technology, i-CREATe 2013, in Conjunction with SENDEX 2013

作者： Jaysrichai, Tossaphon Suputtitada, Areerat Khovidhungij, Watcharapong Chanwimalueang, Threerasak Biomedical Engineering Program Faculty of Engineering Chulalongkorn University Bangkok Thailand Faculty of Medicine Chulalongkorn University Bangkok Thailand Faculty of Engineering Srinakharinwirot University Nakhon-Nayok Thailand

Inertial Measurement Units (IMU) are applied as a new tool to acquire information regarding human joint motion. In order to better understand and acquire accurate measurements, one must be certain that the equipment is accurate. This study was designed to test the validity of our developed IMU system with regards to both statics and dynamics. Our developed IMU system was compared using standard reference angles and a standard three dimensional (3D) camera system. The results showed that the absolute average of the differences between the reference angles and our IMU measurements in the static testing were 1.44±0.76 degrees on sensors no. 1&2 and 1.44±2.63 degrees on sensor no. 3&4 in the sagittal plane. In the coronal plane, they were 1.19±0.45 degrees and 1.58±0.41 degrees, respectively. For the dynamic testing, angular outputs from our developed IMU sensors no. 1&2 compared to the angular outputs from the 3D camera system had the range of differences within ±4 degrees when testing in the sagittal and coronal planes. The angular outputs from sensor no. 3&4 had a range of differences within ±5 degrees. In conclusion, our developed IMU system was proven to be accurate in both static and dynamic testings in both planes.

关键词： Cameras

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Comparisons and development of electrochemical sensors using G-PANI composite based on filter paper and transparency film substrate

Comparisons and development of electrochemical sensors using...

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Nanotechnology 2014: Graphene, CNTs, Particles, Films and Composites - 2014 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2014

作者： Ruecha, N. Rodthongkum, N. Cate, D.M. Chailapakul, O. Henry, C.S. Program in Macromolecular Science Faculty of Science Chulalongkorn University Pathumwan Bangkok 10330 Thailand Metallurgy and Materials Science Research Institute Chulalongkorn University Pathumwan Bangkok 10330 Thailand School of Biomedical Engineering Colorado State University Fort Collins CO 80523 United States Electrochemistry and Optical Spectroscopy Research Unit Department of Chemistry Chulalongkorn University Pathumwan Bangkok 10330 Thailand Department of Chemistry Colorado State University Fort Collins CO 80523 United States

ISBN: (纸本)9781482258264

Electrochemical sensors based on filter paper and transparency film substrates have been prepared using screen-printing method for the detection of the heavy metals ions including Pb2+, Cd2+ and Zn 2+. The electrochemical characteristics of these electrodes were analyzed using cyclic voltammetry (CV) and anodic stripping voltammetry (ASV) while the surface roughness were measured using an optical profilometer. For electrochemical characterization by CV, electrodes on paper give a higher current response for ferri/ferrocyanide than transparency-based electrodes. When using ASV for the detection of heavy metals, the transparency-based device gave higher current response than paper-based device. Moreover, for the surface characterization using optical profilometry, carbon ink penetrated into the porous of filter paper but coated on the transparency film substrate affecting to surface roughness in transparency-based electrodes is higher than electrodes on paper. To improve the sensitivity of these devices, graphene (G) and polyaniline (PANI) nanocomposite was prepared by polymerization of aniline monomer in the presence of G and used for electrode modification. G/PANI nanocomposite-modified electrode was characterized by CV and used for heavy metals detection by ASV. This system will be very useful for portable environmental monitoring.

关键词： Graphene

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A programmable Acoustic Stimuli and Auditory Evoked Potential Measurement System for Objective Tinnitus Diagnosis Research

A Programmable Acoustic Stimuli and Auditory Evoked Potentia...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Yunseo Ku Joong Woo Ahn Chiheon Kwon Myung-Whan Suh Jun Ho Lee Seung Ha Oh Hee Chan Kim Samsung Electronics Samsung Advanced Institute of Technology Suwon Korea Interdisciplinary Program of Bioengineering Seoul National University Graduate School Seoul Korea Department of Otorhinolaryngology-Head and Neck Surgery Seoul National University Hospital Seoul Department of Biomedical Engineering Seoul National University College of Medicine Seoul Korea

This paper presents the development of a single platform that records auditory evoked potential synchronized to specific acoustic stimuli of the gap prepulse inhibition method for objective tinnitus diagnosis research. The developed system enables to program various parameters of the generated acoustic stimuli. Moreover, only by simple filter modification, the developed system provides high flexibility to record not only short latency auditory brainstem response but also late latency auditory cortical response. The adaptive weighted averaging algorithm to minimize the time required for the experiment is also introduced. The results show that the proposed algorithm can reduce the number of the averaging repetitions to 70% compared with conventional ensemble averaging method.

关键词： Acoustics Acoustic measurements Noise measurement Noise Electrodes Educational institutions Animals

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Development of the variable pulsewidth mode-locked femtosecond laser using coherent coupling

Development of the variable pulsewidth mode-locked femtoseco...

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32nd International Congress on Applications of Lasers and Electro-Optics, ICALEO 2013

作者： Yasuhiro, Nishiyama Minoru, Yoshida Hiraku, Yabuno Program in Electronic Engineering Interdisciplinary Graduate Faculty of Science and Engineering Kinki University 3-4-1 Kowakae Higashi-osaka Osaka 577-8502 Japan

Laser processing field demand high energy pulses, thus widening pulsewidth is necessary for femtosecond pulses [1,2]. We have developed a novel method variable pulsewidth laser, which is different from conventional systems with optical BPF (Band- Pass Filter). Our pulsewidth tuning system applies a coherent coupling. When two laser-beams are coupled, output-longitudinal-modes are emitted by corresponding longitudinal modes of respective laser modules. In this study, one longitudinal-mode-space is changed arbitrary by tuning cavity length to control the output-longitudinal-modes. As the result, an envelope of the longitudinal modes, i.e. spectrum bandwidth is controlled to tune the pulsewidth. In experiment, the laser modules of our system generate about 150 fs pulsewidth and around 30 nm spectrum bandwidth respectively. The result of the coupling, the pulsewidth is tuned with cavity length. The cavity length difference is controlled to 1.5 mm between the laser modules, and we have succeeded in widening the pulse to 1.2 ps at maximum.

关键词： Femtosecond lasers

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A preliminary study of non-intrusive blood pressure monitoring using portable device

A preliminary study of non-intrusive blood pressure monitori...

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International Conference on biomedical Electronics and Devices, BIODEVICES 2013

作者： Kim, Hanbyul Lee, Hongji Baek, Hyunjae Lee, Wonkyu Lee, Jungsu Park, Kwangsuk Interdisciplinary Program of Bioengineering College of Engineering Seoul National University Seoul Korea Republic of Department of Biomedical Engineering College of Medicine Seoul National University Hospital Seoul Korea Republic of

ISBN: (纸本)9789898565341

Novel blood pressure (BP) monitoring device focused on portability was studied preliminarily. Electrocardiogram (ECG) and photoplethysmogram (PPG) was measured and pulse arrival time (PAT) was computed from these signals. Systolic blood pressure (SBP) and diastolic blood pressure (DBP) showed a clear correlation with PAT. BP estimation model was constructed based on this result and verified by means of leave-one-out cross-validation (LOOCV). Estimated SBP, DBP were involved in two standards of means of original data. This device is expected to be useful to the people who want to monitor BP at any time and space.

关键词： Electrocardiograms

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Abstracts from the 15th International Myopia Conference

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Eye and Vision 2016年第1期3卷 211-221页

作者： Alexandra Benavente-Perez Ann Nour Tobin Ansel Kathleen Abarr Luying Yan Keisha Roden David Troilo Chanyi Lu Miaozhen Pan Min Zheng Jia Qu Xiangtian Zhou Christine F. Wildsoet Fan Lu Jie Chen Jinhua Bao Liang Hu Qinmei Wang Zibing Jin Frances Rucker Stephanie Britton Stephan Hanowsky Molly Spatcher Hui-Ying Kuo Ching-Hsiu Ke I-Hsin Kuo Chien-Chun Peng Han-Yin Sun Ian G. Morgan Jeremy A. Guggenheim Rupal L. Shah Cathy Williams Jinglei Yang Peter S. Reinach Sen Zhang Wenfeng Sun Bo Liu Fen Li Xiaoqing Li Aihua Zhao Tianlu Chen Wei Jia Jun Jiang Haoran Wu Kazuo Tsubota Hiroko Ozawa Hidemasa Torii Shigemasa Takamizawa Toshihide Kurihara Kazuno Negishi Klaus Graef Daniel Rathbun Frank Schaeffel Ladan Ghodsi William K. Stell Machelle T. Pardue Ranjay Chakraborty Han na Park Curran S. Sidhu P. Michael Iuvone Michael J Collins Nethrajeith Srinvasalu Sally A. McFadden Paul N. Baird Pablo Artal Pauline Cho SW Cheung Pei-Chang Wu Quan V. Hoang Duk C. Lee Erica G. Landis Michael A. Bergen Curran Sidhu Samer Hattar Richard A. Stone Ravi Metlapally Ruiqin Li Qinglin Xu Hong Zhong Chenglin Pan Weizhong Lan Xiaoning Li Ling Chen Zhikuan Yang Scott A. Read Seang-Mei Saw Shi-Jun Weng Xiao-Hua Wu Kang-Wei Qian Yun-Yun Li Guo-Zhong Xu Furong Huang Xiong-Li Yang Yong-Mei Zhong Earl L Smith, III Baskar Arumugam Li-Fang Hung Lisa A. Ostrin Klaus Trier Monica Jong Brien A. Holden Thomas Chuen Lam Samantha Shan Bing Zuo Dennis Yan-yin Tse Jingfang Bian King-Kit Li Quan Liu Chi-ho To Timothy J. Gawne John T. Siegwart, Jr. Alexander H. Ward Thomas T. Norton Yan Zhang Yue Liu Carol Ho Eileen Phan Abraham Hang Emily Eng Christine Wildsoet Department of Biological Sciences SUNY College of Optometry New York NY 10036 USA School of Optometry and Ophthalmology and Eye Hospital Wenzhou Medical University Wenzhou Zhejiang 325027 China Center for Eye Disease & Development School of Optometry & Vision Science Program University of California Berkeley Berkeley CA 94720-2020 USA Wenzhou Medical University Wenzhou Zhejiang 325027 China Biomedical Science and Disease New England College of Optom Boston MA USA School of Optometry Chung Shan Medical University Taichung City 402 Taiwan Institute of Medicine Chung Shan Medical University Taichung City 402 Taiwan Division of Biochemistry and Molecular Biology Research School of Biology Australian National University Canberra Australia State Key Laboratory of Ophthalmology and Division of Preventive Ophthalmology Zhongshan Ophthalmic Center Sun Yat-Sen University Guangzhou China School of Optometry & Vision Sciences Cardiff University Cardiff UK School of Social and Community Medicine University of Bristol Bristol UK School of and Eye Hospital Wenzhou Medical University Wenzhou Zhejiang 325027 China State Key Laboratory Cultivation Base and Key Laboratory of Vision Science Ministry of Health and Zhejiang Provincial Key Laboratory of Ophthalmology and Optometry Wenzhou Zhejiang 325027 People’s Republic of China Shanghai Key Laboratory of Diabetes Mellitus and Center for Translational Medicine Shanghai Jiao Tong University Affiliated Sixth People’s Hospital Shanghai 200233 China Eye Hospital of Wenzhou Medical University Wenzhou Zhejiang 325027 China Department of Ophthalmology Keio University School of Medicine Shinjuku-ku Tokyo 160-8582 Japan General Medicine Ichikawa Medical Center Urayasu City Chiba 279-0001 Japan Ophthalmic Research Institute University of Tuebingen 72076 Tuebingen Germany Bernstein Center for Computational Neuroscience Tuebingen 72076 Tuebingen Germany Werner Reichardt Centre for Integrative Neuroscience Otfried-Mueller-Straße 25 Tueb

To assess the peripheral refractive changes that occur when eye growth decelerates in *** We measured peripheral refraction and on-axis vitreous chamber depth on a total of 53 marmosets;36 treated monocularly for 12 weeks 9 hrs/day(26 with-5 D contact lenses,10 with+5 D)and 17 untreated *** the 26 marmosets treated with-5 D,10 wore contact lenses 9 hrs/day without interruptions and were mea-sured at the end of 10 weeks of treatment(T10)and after 4 weeks of recovery(R14).Eight had both contact lenses removed for 30 mins twice/day(mid-morning and mid-afternoon)during the first four weeks of treatment(early interruption group)and eight had the lenses removed during the second four weeks of treatment(late interruption group).The two interruption groups were measured after 4,8 and 12 weeks of treatment only(T4,T8,T12).

关键词： removed treatment untreated

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Development of an Arthroscopic Ultrasound Probe for Assessment of Articular Cartilage Degeneration

Development of an Arthroscopic Ultrasound Probe for Assessme...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Y. P. Huang Y. P. Zheng Interdisciplinary Division of Biomedical Engineering Faculty of Engineering Hong Kong Polytechnic University

ISBN: (纸本)9781457702150

Quantitative assessment of articular cartilage is important for the early diagnosis of osteoarthritis, intra-operation joint tissue evaluation and judgment of repaired cartilage quality. This technique is also applicable to the cartilage if arthroscopic instrument embedding this technique can be developed. In this study, an arthroscopic water-jet ultrasound indentation probe was developed with the help of a small profile intra-articular ultrasound imaging (IAUS) catheter for the intra-articular measurement of cartilage condition. The probe can provide measurement of morphological, acoustical and mechanical properties of articular cartilage. Preliminary tests were conducted on 10 intact porcine knees with the guide of arthroscopy for the evaluation of cartilage degeneration, which was induced by trypsin digestion. Results showed the cartilage stiffness decreased significantly after the digestion (p < 0.001) with the measurement conducted by the developed probe. In summary, an arthroscopic ultrasound probe has been successfully developed and its utility in detecting the cartilage degeneration was demonstrated in this study. Future work includes the improvement of the probe design and studies on measurement of animal or human samples in vivo.

关键词： cartilage degeneration Articular Cartilages Probes Cartilage Ultrasonic Waves Judgment Arthroscopy

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Evaluation of three mattress designs for capacitive ecg measurement from conductive textiles on bed

Evaluation of three mattress designs for capacitive ecg meas...

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10th IASTED International Conference on biomedical engineering, BioMed 2013

作者： Lee, Hongji Lee, Seungmin Park, Kwangsuk Interdisciplinary Program of Bioengineering Seoul National University Seoul 110-799 Korea Republic of Department of Biomedical Engineering College of Health Science Korea University Seoul 136-703 Korea Republic of Department of Biomedical Engineering College of Medicine Seoul National University Seoul 110-799 Korea Republic of

ISBN: (纸本)9780889869530

In this paper, we developed three designs depending on the shape of electrode array for unconstrained electrocardiogram (ECG) measurement and tested the systems in practical and numerical terms. Conductive textiles and polyurethane form were used to make electrodes for comfortable ECG measurement. A total of three experiments were conducted to compare each design with a conventional ECG system by error rates of heart rate variability parameters, and to test the effects of capacitive ECG measurement depending on the thickness of cotton cloth inserted between a subject and textile electrodes, in cases of textiles with laminating or without laminating process. The overall results showed that the general type of horizontal array had the best performance in numerical side even though other designs were modified for reflection of heart axis or better contact in practical aspect. The maximum possible thickness for ECG measurement was about 2 mm on conductive textile and about 1.5 mm on the textile laminated by non-conductive material. Therefore, in terms of durability, the system is possible to apply enough in real life and we can use this system for algorithm of arrhythmias detection, OSA detection and sleep stages.

关键词： Electrocardiograms

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Accuracy assessment of different finger placements for cardiopulmonary resuscitation on infants

Accuracy assessment of different finger placements for cardi...

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IEEE EMBS International Conference on Information Technology Applications in Biomedicine (ITAB)

作者： Jiheum Park Chiyul Yoon Jae Yun Jung Do Kyun Kim Young Ho Kwak Jung Chan Lee Hee Chan Kim Interdisciplinary Program of Bioengineering Seoul National University Graduate School Seoul Korea Department of Emergency Medicine Seoul National University Hospital Seoul Korea Department of Emergency Medicine Seoul National University Hospital Seoul 110-744 Korea Department of Emergency Medicine Seoul National University College of Medicine Seoul Korea Department of Biomedical Engineering Seoul National University Hospital Seoul Korea

ISBN: (纸本)9781479921324

The assessment of cardiopulmonary resuscitation (CPR) is important for training as well as CPR related research to validate new method or to confirm efficacy of existing one. Infant CPR, in particular, has been received great attention due to its controversy over appropriateness of or superiority between two different methods, two-finger (TF) and two-thumb (TT) CPR, suggested by the resuscitation council. Accordingly, the development of assessment tool that is capable of reliably investigating different CPR techniques has become critical. One of the most challenging task in the infant CPR is to provide consistent and accurate finger placement throughout the performance. Here, we suggest a new method to measure accuracy of the finger placement for both TF and TT CPR using manikin-integrated digital measuring system developed in the previous study. Center of forces of force sensitive resistance sensors used for assessing different finger placements were measured in each compression and scattered on 2D plane to quantitatively and qualitatively probe the finger position. The appearance of the scattered data turned out to be significantly different depending on the performance capability. In the comparison between beginners and experts, stdY and meanDist were significant parameters differentiating these two groups for both techniques, meaning beginners are poor at providing consistent forces along y direction and targeting a specific region while relatively good at balancing in x direction.

关键词： Sensors Pediatrics Thumb Force Accuracy Correlation

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Planarization of the surface of electrowetting on dielectric device for droplet speed improvement

Planarization of the surface of electrowetting on dielectric...

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17th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2013

作者： Lee, Choonghee Kim, Hee Chan Chun, Honggu Interdisciplinary Program for Bioengineering Seoul National University Seoul 151-742 Korea Republic of Department of Biomedical Engineering College of Medicine Seoul National University Seoul 151-742 Korea Republic of Institute of Medical and Biological Engineering Seoul National University Seoul Korea Republic of Department of Biomedical Engineering Korea University Seoul 136-703 Korea Republic of

ISBN: (纸本)9781632666246

The surface roughness aggravates droplet manipulation speed by increasing contact angle hysteresis (CAH) and pinning force between droplet and an electrowetting on dielectric (EWOD) device. Because spacing between electrodes in the EWOD device cannot be filled up by thin film deposition process for an insulation and hydrophobic layer fabrication, trenches as deep as metal electrode layer are generated on the surface. The trenches increase the surface roughness of EWOD device, especially at the edge. In this work, polishing technique (chemical mechanical polishing, CMP) was appplied to EWOD fabrication to remove the trenches on the surface of the EWOD device. To verify the effect of the surface polishing on droplet speed improvement, we fabricated both unpolished and polished EWOD devices that comprised of 0.5 × 0.5, 1 × 1, and 1.5 × 1.5 mm2 electrodes array to manipulate 1 to 10 μL droplets. Droplet speed on the polished devices was improved by 21 to 100 % compared to that of the unpolished one.

关键词： Drops

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