Browsing by Issue Date, starting with "2019-11-15"

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Optimal Design of a New Strain-Type Sensor for Cuff-Less Blood Pressure Measurement via Finite Element Modeling and Taguchi Method
(2019-11-15)
Tu, Tse-Yi
;
Chao, Paul C-P
;
電機工程學系
;
電控工程研究所
;
Department of Electrical and Computer Engineering
A new cuff-less blood pressure (BP) sensor is designed and optimized in this paper. This BP sensor is in a shape of a circular disc of polymer enclosing an electrode. As the sensor is attached to the wrist artery, the dynamic bending of the sensor due to small artery pulsation induces variation in the electrode strain, and then, its resistance varies. With adequate amplification to sense resistance variation, the pulsation signals can be successfully obtained. With the measured pulsation representing well the blood volume pulsation (BVP), BP can be estimated next via the pulse wave velocity (PWV) theory. Effort is dedicated by this paper to optimize the sizes and geometry of the proposed sensor to maximize the electrode curvature change for largest measured signal-to-noise ratio (SNR) possible, which maximizes the accuracy of BP estimation. To this end, the optimization via the finite element modeling and the Taguchi method is carried out. In results, the optimal sizes in height/radius, fillet, hardness, and the electrode position of the polymer disc are successfully derived, which are in the height of 2 mm, the radius of 6mm, the distance between the planar electrode and the bottom surface of sensor being 1 mm, the hardness of the encapsulating polymer being 25 in shore A hardness, and the fillets at the bottom of the polymer disc being 1 mm in radii. BP is measured for 59 subjects. The resulted errors are 3.60 +/- 5.40 mmHg (mean difference +/- standard deviation) and 1.15 +/- 1.63 mmHg for SBP and DBP, respectively. The correlations are 0.8787 and 0.9648, demonstrating well the favorable performance of the developed sensor.
【自煮時代：宿舍廚房改造願景工作坊】（一學分）
(國立陽明大學, 2019-11-15)
陽明電子報編輯小組
樂生首次院外展，珍貴公衛史料重現陽明
(國立陽明大學, 2019-11-15)
陽明電子報編輯小組
經過半年多籌畫，並獲得許多陽明校友捐款支持，藝文中心2019壓軸強檔──【樂生在陽明：醫病、生活文物展】10月31日揭幕，這也是...
榮陽媒合會發表多項創新研發成果，深具產業化價值
(國立陽明大學, 2019-11-15)
陽明電子報編輯小組
陽明與臺北榮民總醫院11月12日共同舉辦第二屆「榮陽聯合研發成果發表媒合會」，展現12位教授、醫師及兩家育成廠商之最新研發成果...
【語言暨博雅通識活動日】～遊藝動靜之間
(國立陽明大學, 2019-11-15)
陽明電子報編輯小組
Enhancement of hydrogen evolution reaction by Pt nanopillar-array electrode in alkaline media and the effect of nanopillar length on the electrode efficiency
(2019-11-15)
Cheng, Hsyi-En
;
Li, Wen-Lung
;
Yang, Zu-Po
;
光電系統研究所
;
Institute of Photonic System
Pt nanopillar-array 3D electrodes with nanopillar length of 150, 450 and 900 nm and nanopillar density of similar to 10(9) cm(-2) were fabricated. Their catalytic activity for hydrogen evolution reaction (HER) was evaluated by linear sweep voltammetry and electrochemical impedance spectroscopy. In comparison with straightly electrodeposited black Pt film and forged Pt sheet electrodes, the HER current density has been significantly improved by the nanopillar-array architecture. The overpotential of HER at current density of 10 mA cm(-2) at 26 degrees C is as low as 78 mV, lower than the black Pt film of 107 mV and the Pt sheet of 174 mV. The improvement of HER is ascribed to the low charge transfer resistance of the 3D electrode and the high desorption capability of hydrogen bubbles at the nanotips. Interestingly, the nanopillar-array 3D electrode has an optimal nanopillar length for HER. The mechanisms for the optimal nanopillar length were investigated here. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
【11/29與校長有約】
(國立陽明大學, 2019-11-15)
陽明電子報編輯小組
Simulation study of gated nanowire InAs/Si Hetero p channel TFET and effects of interface trap
(2019-11-15)
Joseph, H. Bijo
;
Singh, Sankalp Kumar
;
Hariharan, R. M.
;
Tarauni, Yusuf
;
Thiruvadigal, D. John
The impact of EOT (Equivalent Oxide Thickness) scaling, diameter scaling, and interface traps on the performance of gated InAs/Si Hetero pTFET (Tunneling field effect transistor) is investigated. EOT scaling improves SS (SubthresholdSwing) below the thermal limit and on current moderately. Diameter scaling decreases on current and marginally improves SS. The simulation study validates that the transfer characteristics of pTFET in sub-threshold region are completely dominated by thermionic emission of holes and TAT (Trap Assisted Tunneling). This in turn blocks SS to attain < 60 mV/dec. Furthermore, Si/Oxide interface traps minimize the electrostatic gate coupling with channel region additionally deteriorates SS. Interface trap density with different values denotes that sub 2.3k(B)T/q SS can only be realized for interface trap densities D-it < 1 x 10(11) cm(-2)eV(-1) at both InAs/Si and Si/Oxide. Hence this reaffirms the experimental data, that the prerequisite of D-it < 1 x 10(12) cm(-2)eV(-1) for InAs/Si nanowire p-TFET.
【年輕研究學者論文撰寫工作坊】
(國立陽明大學, 2019-11-15)
陽明電子報編輯小組
【生物醫學暨工程學院院級演講】～黃自強教授主講
(國立陽明大學, 2019-11-15)
陽明電子報編輯小組
【生醫領航方舟企業講座9】藥物開發評估與分析
(國立陽明大學, 2019-11-15)
陽明電子報編輯小組
「樂生文物展」延伸講座：科學博物館的藝術介入
(國立陽明大學, 2019-11-15)
鍾庭宜
;
陽明電子報編輯小組
藝文中心【樂生在陽明：醫病、生活文物展】開展後，相關的講座活動也陸續登場。第一場延伸講座，是由藝文中心與科技社會所、視覺文化所合辦的「展覽跨領域：科學博物館的藝術介入」，邀請到國立臺北藝術大學博物館研究所張婉真教授，來和大家分享藝術如何介入以自然科學為主的博物館，及其在展示方法與呈現上的策略。
【愛滋宣導與標語設計比賽】
(國立陽明大學, 2019-11-15)
陽明電子報編輯小組
A Piezoceramic Sensor for Detection of Focused Ultrasound-Induced Cavitation
(2019-11-15)
Chen, Jung-Chih
;
Chang, Hsin-Yun
;
Chen, Jiun-Jung
;
Chen, Gin-Shin
;
分子醫學與生物工程研究所
Acoustic cavitation plays a key role in blood-brain-barrier opening. Stable cavitation is required for safely transient barrier disruption when inertial cavitation may cause potentially undesirable damage to brain. To ensure the safety, an appropriate passive cavitation detector is needed to monitor cavitation activity during focused ultrasound treatment. The purpose of this study was to develop a passive cavitation detector with high sensitivity at the specific frequency used in blood-brain-barrier opening. The detector was designed with the assistance of pulse-echo response simulations, using the software PiezoCAD. The active transducer of the detector was constructed of two matching layers, a PZT-5A ceramic disk and the titanium backing. The detector was characterized via the pulse-echo measurements and a commercial hydrophone was used to determine the sensitivity of the developed detector. Cavitation experiments were also performed to validate the detector. The experimental results showed that the detector had the center frequency of 1.16 MHz with the bandwidth of 44.8% and its sensitivity was 2.87 V / MPa at 1.0 MHz. In cavitation experiments, 2-MHz focused ultrasound with the focal intensity of 58 W/cm(2) and 1461 W/cm(2) induced stable cavitation and inertial cavitation in free field, separately. The spectra of the ultrasound signals detected by the detector indicated the occurrence of peak voltages at the subharmonic frequency of 1 MHz and the increase in the level of wideband signals, reflecting stable cavitation and inertial cavitation, respectively. Based on the design guideline of this study, the passive cavitation detector can be developed dedicated for blood-brain-barrier opening.
深入偏鄉實地體驗，「行醫醫定行」課程展成效
(國立陽明大學, 2019-11-15)
陽明電子報編輯小組
「期許未來自己成為醫生後，也能跟患者建立如此緊密的醫病信任關係」「在老年人口為主的高齡社會，每個醫師都需要培養各方面的專...
陽明醫學生領軍團隊，勇奪「史丹福銀髮設計亞洲區大賽」優勝
(國立陽明大學, 2019-11-15)
陽明電子報編輯小組
由陽明醫學系同學領軍的Pneumatile團隊，以「充氣巧拼」的創新作品，勇奪今年「史丹福設計競賽」亞洲區大賽學生組優勝，將和另外...
NiO functionalized Co3O4 hetero-nanocomposites with a novel apple-like architecture for CO gas sensing applications
(2019-11-15)
Chen, Kuan-Wei
;
Tsai, Ju-Heng
;
Chen, Chun-Hua
;
材料科學與工程學系
;
Department of Materials Science and Engineering
An innovative NiO functionalized Co3O4 hetero-nanocomposite exhibiting an unusual apple-like architecture has been successfully fabricated via a facile two-step chemical route for CO gas sensing applications. The unique mimetic morphology constructed by spike-like NiO nanobundles with sharp tips planted on the surface of the preformed extremely porous Co3O4 nanospheres not only creates specific structural advantages but, more importantly, induces chemical activation required for gas sensing. Higher sensitivity and lower operating temperature are thus obtained for the present NiO-Co3O4 hetero-nanocomposite in comparison with those for the bare Co3O4 nanospheres and also for most reported intrinsic or heterogeneous Co3O4 nano-oxides. (C) 2019 Elsevier B.V. All rights reserved.
朱唯勤教授創新加值計畫，榮獲科技部績優案源第二名
(國立陽明大學, 2019-11-15)
陽明電子報編輯小組
本校醫工系朱唯勤教授以「髓腔內鋼釘快速定位裝置金屬加工創新加值計畫」，榮獲科技部績優案源第二名，這也是朱老師團隊繼科技部2...
《蜘蛛人：新宇宙》（Spider-Man: Into the Spider-Verse）
(國立陽明大學, 2019-11-15)
黃柏威
;
陽明電子報編輯小組
Reactive sputtering for highly oriented HfN film growth on Si (100) substrate
(2019-11-15)
Fang, Yu-Siang
;
Chiu, Kun-An
;
Do, Hien
;
Chang, Li
;
材料科學與工程學系
Highly oriented cubic (100) HfN films were grown on Si (100) substrates by direct current magnetron reactive sputtering of a metallic Hf target in an Ar/N-2 gas environment. The influence of N-2 flow ratio on the (100) preferred orientation and crystallinity of the HfN films is investigated. X-ray diffraction shows that not only HEN but also orthorhombic HfSi2 forms in the sputtered films. Increasing the N-2 flow ratio is unfavorable for the formation of HfSi2 while the deposition rate of HfN is decreased. X-ray diffraction and cross-sectional scanning transmission electron microscopy (STEM) reveal that epitaxial orthorhombic HfSi2 can form on the Si substrate, and (100) HfN is in epitaxy with the epitaxial HfSi2. As a result, a (100) oriented HfN film can grow on Si. The epitaxial relationships are shown to be HfN (100)[01 (1) over bar] // HfSi2 (020)[001] // Si (100)[01 (1) over bar] and HfN (100)[01 (1) over bar] // HfSi2 (020)[100] // Si (100)[01 (1) over bar]. Atomically resolved STEM images also show the bonding characteristics across the HfN/HfSi2 and HfSi2/Si interfaces.