Browsing by Author "Lin, Li-Min"

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Advanced Cu chemical displacement technique for SiO2-based electrochemical metallization ReRAM application
(2014-10-28)
Chin, Fun-Tat
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Lin, Yu-Hsien
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You, Hsin-Chiang
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Yang, Wen-Luh
;
Lin, Li-Min
This study investigates an advanced copper (Cu) chemical displacement technique (CDT) with varying the chemical displacement time for fabricating Cu/SiO2-stacked resistive random-access memory (ReRAM). Compared with other Cu deposition methods, this CDT easily controls the interface of the Cu-insulator, the switching layer thickness, and the immunity of the Cu etching process, assisting the 1-transistor-1-ReRAM (1T-1R) structure and system-on-chip integration. The modulated shape of the Cu-SiO2 interface and the thickness of the SiO2 layer obtained by CDT-based Cu deposition on SiO2 were confirmed by scanning electron microscopy and atomic force microscopy. The CDT-fabricated Cu/SiO2-stacked ReRAM exhibited lower operation voltages and more stable data retention characteristics than the control Cu/SiO2-stacked sample. As the Cu CDT processing time increased, the forming and set voltages of the CDT-fabricated Cu/SiO2-stacked ReRAM decreased. Conversely, decreasing the processing time reduced the on-state current and reset voltage while increasing the endurance switching cycle time. Therefore, the switching characteristics were easily modulated by Cu CDT, yielding a high performance electrochemical metallization (ECM)-type ReRAM.
Continuous Human Location and Posture Tracking by Multiple Depth Sensors
(2014)
Qiu, Jun-Wei
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Chiang, Ting-Hui
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Lo, Chi Chung
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Lin, Li-Min
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Van, Lan-Da
This paper proposes a continuous location and skeletal tracking system using multiple RGB-Depth sensors (such as Kinects) deployed along a corridor with overlapping coverages. First, we transform the coordinates of all sensor into a unified coordinate. Second, the system recognizes users (such as patients under rehabilitation) from different views of these sensors and classifies them by their patient IDs. Third, the patient information can be continuously handed over among sensors when they move around the area. Experiment results show that the skeletal association during handover achieves approximately 90.61% in accuracy and 96.89% in precision in 44,817 experiment trials. By our observation, injured people possess asymmetric gait parameters especially on the ratio of the duration of the swing/stance phase. For example, the injured foot generally has a longer swinging duration than the healthy side. The proposed system has potential in patient rehabilitation monitoring applications.
High Performance Cu-doped SiO2 ReRAM by a Novel Chemical Soak Method
(2011-01-01)
Chin, Fun-Tat
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Yang, Wen-Luh
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Chao, Tien-Sheng
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Chang, Yuan-Ming
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Lin, Li-Min
In this paper, a novel chemical soak method is proposed to fabricate a Cu-doped SiO2 ReRAM device. This method can easily fabricate a lightly Cu-doped SiO2 film and effectively improve the reliability of the conventional Cu-doped SiO2 ReRAM device. A reproducible bipolar switching characteristic with set/reset voltage (ca. 2.5 V/ -0.7 V) is performed in this device and the electrical conduction in HRS and LRS are related to Poole-Frenkel and Ohmic conduction, respectively. Excellent performance in terms of high on/off ratio (similar to 10(6)), narrow range distribution of set and reset voltages, stable data retention, and up to 110 times switching cycles has been achieved by this novel chemical soak method for Cu-doped SiO2 ReRAM device.
Switching characteristics in Cu:SiO2 by chemical soak methods for resistive random access memory (ReRAM)
(2015-01-01)
Chin, Fun-Tat
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Lin, Yu-Hsien
;
Yang, Wen-Luh
;
Liao, Chin-Hsuan
;
Lin, Li-Min
A limited copper (Cu)-source Cu:SiO2 switching layer composed of various Cu concentrations was fabricated using a chemical soaking (CS) technique. The switching layer was then studied for developing applications in resistive random access memory (ReRAM) devices. Observing the resistive switching mechanism exhibited by all the samples suggested that Cu conductive filaments formed and ruptured during the set/reset process. The experimental results indicated that the endurance property failure that occurred was related to the joule heating effect. Moreover, the endurance switching cycle increased as the Cu concentration decreased. In high-temperature tests, the samples demonstrated that the operating (set/reset) voltages decreased as the temperature increased, and an Arrhenius plot was used to calculate the activation energy of the set/reset process. In addition, the samples demonstrated stable data retention properties when baked at 85 degrees C, but the samples with low Cu concentrations exhibited short retention times in the low-resistance state (LRS) during 125 degrees C tests. Therefore, Cu concentration is a crucial factor in the trade-off between the endurance and retention properties; furthermore, the Cu concentration can be easily modulated using this CS technique. (C) 2014 Elsevier Ltd. All rights reserved.
The Imaging Behavior of an MRI Contrast Agent [Gd(TTDA-BOM)](2-) in a Mice Liver Tumor Model at 3 Tesla
(2010)
Jao, Jo-Chi
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Lu, Hsiang-Chin
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Lu, Hsin-Ying
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Wang, Yun-Ming
;
Liu, Gin-Chung
[Gd(TTDA-BOM)](2-) is a newly developed paramagnetic contrast agent. The aim of this study was to investigate the magnetic resonance imaging (MRI) behavior of [Gd(TTDA-BOM)](2-) in mice with implanted AS-30D (Chang hepatoma ascites, CHA) tumor in liver at a 3T high-field whole-body magnetic resonance (MR) scanner. The high-field MR scanner is expected to have a higher signal-to-noise ratio (SNR). The dynamic MRI studies show that the signal enhancement in liver is larger than that in tumor, so that the contrast-to-noise ratio (CNR) between liver and tumor increases after [Gd(TTDA-BOM)](2-) injection. During one-hour investigation, it was found that [Gd(TTDA-BOM)](2-) could stay in liver up to one hour. On the contrary, [Gd(DTPA)](2-) , a kind of commercial contrast agent, was excreted from liver quickly. Therefore, the CNR between liver and tumor using [Gd(TTDA-BOM)](2-) is larger than that using [Gd(DTPA)](2-) and remains high at least up to one hour. In conclusion, [Gd(TTDA-BOM)](2-) might have good potential for being a hepatobiliary MR contrast agent.