Browsing by Issue Date, starting with "2012-01-11"

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記憶體元件及其製作方法
(2012-01-11)
邱碧秀
;
張麗君
;
何嘉政
;
李岱螢
;
沈佑書
本發明係揭露一種記憶體元件及其製造方法。記憶體元件包含基板、絕緣層、第一導電層、鈦酸銅鈣電阻層以及第二導電層。絕緣層形成於基板之上。第一導電層形成於絕緣層之上。鈦酸銅鈣電阻層形成於第一導電層之上。第二導電層形成於鈦酸銅鈣電阻層之上。於製作時，首先，提供基板，接著於基板之上形成絕緣層，之後於絕緣層之上形成第一導電層，然後利用溶膠凝膠法於第一導電層之上形成鈦酸銅鈣電阻層，最後，於鈦酸銅鈣電阻層之上形成第二導電層。本發明不僅符合電子產品低電壓之需求，且能在降低成本的同時，提升產品之可靠度與相容性。
估測人體姿態之方法
(2012-01-11)
陳俊瑋
;
宋開泰
本發明提供一種多人姿態辨識系統。此系統包括人體姿態感測模組、群蜂(Zigbee)無線網路發展板(CC2420DBK board)及電腦端的多人姿態監測軟體。其中人體姿態感測模組由一個三軸加速度計、一個群蜂(Zigbee)晶片及一個8－bit的微控制器所組成。人體姿態感測模組可與CC2420DBK板構成群蜂(Zigbee)無線網路，達到同時觀察多人姿態的效果。該CC2420DBK為群蜂(Zigbee)無線感測網路的接收端，透過RS－232介面將群蜂(Zigbee)無線感測網路中接收到的資訊與機器人或監控電腦溝通。該多人姿態監測軟體則可以同時檢視三位以上使用者的姿態，並對各個使用者的姿態作記錄與統計。本發明並提供一套結合時域分析與小波轉換的人體姿態辨識演算法，實現在人體姿態感測模組的微控制器中。透過此演算法分析三軸的加速度訊號，可辨識跌倒、站、坐、躺、上樓、下樓與走路七種人體姿態。
跨障礙輔助裝置
(2012-01-11)
鄭璧瑩
;
黃健寶
本發明提供一種跨障礙輔助裝置，其係具有一載具本體、一輔助機構以及一感測驅動裝置。該輔助機構係設置於該載具本體之一側，該輔助機構之一端具有一墊塊，該輔助機構係可藉由一調整動作使該墊塊介於該載具本體與一障礙物間，以分段減少該障礙物相對於該載具本體跨越之段差。感測驅動裝置係與該輔助機構相耦接，該感測驅動裝置係藉由感測障礙物是否存在以決定是否驅動該輔助機構產生該調整動作。利用本發明之機制可以分段縮短障礙物之段差高度，使得載具本體得以分段越過障礙物。
移動式電子裝置尋找定點之方法及系統
(2012-01-11)
胡竹生
一種移動式電子裝置尋找定點之方法包含：於一定點發射一音頻訊號；以及以至少二個音頻接收單元接收音頻訊號，並以音頻接收單元間之距離以及音頻訊號分別抵達二個音頻接收單元之距離差來計算出音頻訊號來源之方位角。同時亦揭露一種移動式電子裝置尋找定點之系統。
Surface-Surface Interaction in Smectic Liquid Crystal Films
(2012-01-11)
Pan, LiDong
;
Hsu, C. S.
;
Huang, C. C.
;
應用化學系
;
Department of Applied Chemistry
Null transmission ellipsometry was employed to study the field induced transition of the surface arrangements in freestanding films of smectic liquid crystals. The interlayer interaction between the two surfaces obtained from the threshold voltage for the transition is found to be antiferroelectric and is quasilong ranged. The possible microscopic origins of the measured interaction and its relevance to the interlayer interaction in antiferroelectric liquid crystal materials are discussed.
Session level flow classification by packet size distribution and session grouping
(2012-01-12)
Lu, Chun-Nan
;
Huang, Chun-Ying
;
Lin, Ying-Dar
;
Lai, Yuan-Cheng
;
資訊工程學系
Classifying traffic into specific network applications is essential for application-aware network management and it becomes more challenging because modern applications complicate their network behaviors. While port number-based classifiers work only for some well-known applications and signature-based classifiers are not applicable to encrypted packet payloads, researchers tend to classify network traffic based on behaviors observed in network applications. In this paper, a session level flow classification (SLFC) approach is proposed to classify network flows as a session, which comprises of flows in the same conversation. SLFC first classifies flows into the corresponding applications by packet size distribution (PSD) and then groups flows as sessions by port locality. With PSD, each flow is transformed into a set of points in a two-dimension space and the distances between each flow and the representatives of pre-selected applications are computed. The flow is recognized as the application having a minimum distance. Meanwhile, port locality is used to group flows as sessions because an application often uses consecutive port numbers within a session. If flows of a session are classified into different applications, an arbitration algorithm is invoked to make the correction. The evaluation shows that SLFC achieves high accuracy rates on both flow and session classifications, say 99.9% and 99.98%, respectively. When SLFC is applied to online classification, it is able to make decisions quickly by checking at most 300 packets for long-lasting flows. Based on our test data, an average of 72% of packets in long-lasting flows can be skipped without reducing the classification accuracy rates. (C) 2011 Elsevier B.V. All rights reserved.
Self-Assembled Poly(ethylene glycol) Buffer Layers in Polymer Solar Cells: Toward Superior Stability and Efficiency
(2012-01-12)
Chien, Shang-Chieh
;
Chen, Fang-Chung
;
Chung, Ming-Kai
;
Hsu, Chain-Shu
;
應用化學系
In this study, we have systematically investigated the mechanism behind the formation of nanoscale self-assembled polymer buffer layers at the cathode interfaces of polymer solar cells. Poly(ethylene glycol) (PEG) molecules in a polymer blend, comprising poly(3-hexylthiophene) and [6,6]-phenyl-C-61-butyric acid methyl ester, spontaneously migrated to the surface where they reacted with the Al cathode to form ohmic contacts. In terms of thermodynamics, the surface energy of the substrates played an important role in triggering the vertical-type morphology. From a kinetics point of view, PEG polymers having lower molecular weights readily underwent vertical phase separation prior to solidification of the polymer films, due to their higher mobilities, whereas PEG polymers of higher molecular weights tended to become trapped in the active layer. Employing this knowledge, we prepared organic photovoltaic cells exhibiting both high efficiency and appreciable improvement in stability.
STATIC RANDOM ACCESS MEMORY WITH DATA CONTROLLED POWER SUPPLY
(2012-01-12)
Chuang Ching-Te
;
Yang Hao-I
;
Hsia Mao-Chih
;
Lin Yung-Wei
;
Lu Chien-Yu
A static random access memory with data controlled power supply, which comprises a memory cell circuit and at least one Write-assist circuit, for providing power to the memory cell circuit according to data to be written to the memory cell circuit.
LOW POWER STATIC RANDOM ACCESS MEMORY
(2012-01-12)
Chuang Ching-Te
;
Yang Hao-I
;
Hsia Mao-Chih
;
Hwang Wei
;
Chen Chia-Cheng
A SRAM that keeps the memory cell array under a low voltage in the Standby mode and Write mode, and raises the memory cell array supply voltage to a high voltage in the Read mode. A SRAM comprising: at least one memory cell circuit, comprising a latch circuit with at least two inverters, and comprising two power receiving terminals for receiving power; and a power supplying circuit, for providing the power to the memory cell circuit, such that the voltages at the power receiving terminals of the latch circuit is below a predetermined voltage level when data is written to the latch circuit. In one embodiment, the memory cell circuit includes a plurality of data accessing terminals and the data accessing terminals are respectively controlled by at least two pass-transistor switch devices.
Histidine-containing Phosphotransfer Protein-B (HptB) Regulates Swarming Motility through Partner-switching System in Pseudomonas aeruginosa PAO1 Strain
(2012-01-13)
Bhuwan, Manish
;
Lee, Hui-Ju
;
Peng, Hwei-Ling
;
Chang, Hwan-You
;
生物科技學系
The histidine-containing phosphotransfer protein-B (HptB; PA3345) is an intermediate protein involved in transferring a phosphoryl group from multiple sensor kinases to the response regulator PA3346 in Pseudomonas aeruginosa PAO1. The objective of this study was to elucidate the biological significance of the HptB-PA3346 interaction and the regulatory mechanisms thereafter. The transcription profiling analysis of an hptB knock-out mutant showed that the expression of a number of motility-related genes was altered consistent with the non-swarming phenotype observed for the mutant. Domain analysis indicated that the PA3346 C-terminal region (PA3346C) exhibits similar to 30% identity with the anti-sigma factor SpoIIAB of Bacillus subtilis. The presence of Ser/Thr protein kinase activity targeting an anti-sigma antagonist, PA3347, at Ser-56 was confirmed in PA3346C using an in vitro phosphorelay assay. Furthermore, PA3346C and the anti-sigma(28) factor FlgM were found to interact with PA3347 individually both in vivo and in vitro. FlgM displaced PA3346C in binding of PA3347 and was then competitively displaced by sigma(28) from the PA3347-FlgM complex, forming a phosphorylation-dependent partner-switching system. The significance of PA3347 phosphorylation in linking the partner-switching system and swarming motility was established by analyzing the swarming phenotype of the PA3347 knock-out mutant and its complement strains.
Non-volatile organic field-effect transistor memory comprising sequestered metal nanoparticles in a diblock copolymer film
(2012-01-14)
Chen, Chia-Min
;
Liu, Chih-Ming
;
Wei, Kung-Hwa
;
Jeng, U-Ser
;
Su, Chiu-Hun
In this study, we fabricated p-channel-type non-volatile organic field-effect transistor (OFET) memory devices featuring an asymmetric PS-b-P4VP diblock copolymer layer incorporating high- and low-work-function metal nanoparticles (NPs) in the hydrophilic and hydrophobic blocks, respectively. We chose the highly asymmetric diblock copolymer PS(56k)-b-P4VP(8k) as the polymer electret to create the memory windows, and used the different work functions of the ex situ-synthesized metal NPs to tune the memory window for either p- or n-channel applications. The transfer curves of non-volatile OFET memory devices incorporating an asymmetric PS(56k)-b-P4VP8k layer embedded with high-work-function Pt NPs (5.65 eV) in the P4VP block exhibited a positive threshold voltage shift and a large memory window (ca. 27 V). In contrast, the transfer curves of the corresponding non-volatile OFET memory devices featuring embedded low-work-function (4.26 eV) Ag NPs exhibited a negative threshold voltage shift and a smaller memory window (ca. 19 V). This approach provides a versatile way to fabricate p- or possibly n-channel-type non-volatile organic field-effect transistor (OFET) memory devices with the same processing procedure.
A new supramolecular film formed from a silsesquioxane derivative for application in proton exchange membranes
(2012-01-14)
Cheng, Chih-Chia
;
Yen, Ying-Chieh
;
Ko, Fu-Hsiang
;
Chu, Chih-Wei
;
Fan, Shih-Kang
A new polyhedral oligomeric silsesquioxane ionomer (HO-doped PUSS-C11-Py) has been investigated. This new ionomer is able to self-assemble through macromers by quadruple hydrogen bonding interactions into a physically crosslinked polymer-like material that can be easily fabricated into films with micro-phase separation. This HCl-doped POSS-C11-Py membrane exhibits higher proton conductivity than a typical Nafion membrane at high temperature, which is extremely rare for a non-sulfonic acid system. This newly developed material may provide an alternative route toward design and fabrication of a new type of proton exchange membranes.
低電能靜態隨機存取記憶體
(2012-01-16)
莊景德
;
楊皓義
;
夏茂墀
;
黃威
;
陳家政
一靜態隨機存取記憶體，包含：至少一記憶格電路，包含了具有至少二反相器的一閉鎖電路，且包含用以接收電能的兩電能接收端；以及一電能供應電路，用以提供該電能至該記憶格電路，使得當資料被寫入至該閉鎖電路時，該閉鎖電路的供應電壓低於一預定電壓。
Carrier dynamics in InN nanorod arrays
(2012-01-16)
Ahn, Hyeyoung
;
Yu, Chih-Cheng
;
Yu, Pyng
;
Tang, Jau
;
Hong, Yu-Liang
In this report, we investigated ultrafast carrier dynamics of vertically aligned indium nitride (InN) nanorod (NR) arrays grown by molecular-beam epitaxy on Si(111) substrates. Dominant band filling effects were observed and were attributed to a partial bleaching of absorption at the probe wavelengths near the absorption edge. Carrier relaxation in nanorod samples was strongly dependent on the rod size and length. In particular, a fast initial decay was observed for carriers in NRs with a small diameter (similar to 30 nm), the lifetime of which is much shorter than the carrier cooling time, demonstrating the substantial surface-associated influence on carrier relaxation in semiconductor nanostructures. (C)2012 Optical Society of America
錄製、還原與重播網路流量的方法
(2012-01-16)
林盈達
;
鄭宗寰
;
賴源正
;
陳一瑋
一種錄製、還原與重播網路流量的方法係用以處理多個網路連線的多個網路封包。錄製、還原與重播網路流量的方法可包括錄製程序、還原程序或是選擇性重播程序。其中錄製程序包括：接收錄製參數(N,M,P)；完整錄製每一網路封包的檔頭以及酬載，並累計每一網路連線的酬載總值；當酬載總值之一超過N時，對與酬載總值對應的網路連線的連續P個網路封包錄製每一網路封包的檔頭，以及酬載的前M個位元組；以及當酬載總值之一超過N並對與酬載總值對應的網路連線連續錄製P個網路封包之後，對與酬載總值對應的網路連線錄製每一網路封包的檔頭。
具有由資料控制之電源供應的靜態隨機存取記憶體
(2012-01-16)
莊景德
;
楊皓義
;
夏茂墀
;
林勇維
;
盧建宇
一種具有由資料控制之電源供應的SRAM，其包含一記憶格電路以及至少一寫入輔助電路。其中寫入輔助電路用以根據欲寫入至記憶格電路的資料提供電能至記憶格電路。
辨識電器狀態的電力監測裝置及其電力監測方法
(2012-01-16)
曹孝櫟
;
賴易聖
;
林明駿
;
陳勇旗
一種辨識電器狀態的電力監控裝置及其電力監控方法，電力監控裝置包括量測模組以及變化偵測與搜尋模組。量測模組測量電源的電耗特性，並且變化偵測與搜尋模組偵測並計算電耗特性的變化。當偵測到變化時，變化偵測與搜尋模組依據此變化來搜尋電器特徵資料庫，以取得對應此變化的電器及其電器狀態。電力監控裝置依據變化偵測與搜尋模組產生之電器變化資料，記載電器的狀態及記錄其耗電情形，並透過比對電器特徵資料庫得知一電器相對於其他相同電器或具備相同功能之其他電器運作是否有效率，以達到節能效果。
Reusable Amperometric Biosensor for Measuring Protein Tyrosine Kinase Activity
(2012-01-17)
Wang, Chung-Liang
;
Wei, Lan-Yi
;
Yuan, Chiun-Jye
;
Hwang, Kuo Chu
;
生物科技學系
This work presents a simple, low-cost and reusable label-free method for detecting protein tyrosine kinase activity using a tyrosinase-based amperometric biosensor (tyrosine kinase biosensor). This method is based on the observation that phosphorylation can block the tyrosinase-catalyzed oxidation of tyrosine or tyrosyl residue in peptides. Therefore, the activity of p60c-src protein tyrosine kinase (Src) on the developed tyrosine kinase biosensor could be quickly determined when its specific peptide substrate, p60c-src substrate I, was used. The tyrosine kinase biosensor was highly sensitive to the activity of Src with a linear dynamic range of 1.9-237.6 U/mL and the lowest detection limit of 0.23 U/mL. Interestingly, the tyrosine kinase activity can be measured using the developed tyrosine kinase biosensor repetitively without regeneration. The inhibitory effect of various kinase inhibitors on the Src activity could be determined on the tyrosine kinase biosensor. Src-specific inhibitors, PP2 and Src inhibitor I, effectively suppressed Src activity, whereas PD153035, an inhibitor of the epidermal growth factor receptor, was ineffective. Staurosporine, a universal kinase inhibitor, inhibited Src activity in an ATP concentration-dependent manner. These results suggests that the activities of tyrosine kinases and their behaviors toward various reagents can be effectively measured using the developed tyrosine kinase biosensor.
Strain-driven phase boundaries in BiFeO3 thin films studied by atomic force microscopy and x-ray diffraction
(2012-01-17)
Liu, Heng-Jui
;
Liang, Chen-Wei
;
Liang, Wen-I
;
Chen, Hsiang-Jung
;
Yang, Jan-Chi
We report a detailed study on the strain-driven phase transition between the tetragonal-like and rhombohedral-like phases in epitaxial BiFeO3 (BFO) thin films which focuses on their structural nature, thermodynamic stability, and ferroelectric/piezoelectric properties. We first show that the tetragonal-like phase, which has a large c/a ratio (similar to 1.2), in the compressively strained BFO is thermodynamically more favorable at high temperature and high strain state (small thickness). We also report a phase transition between two monoclinic phases at 150 degrees C. The two monoclinic phases are differentiated by their c-axis parameters and tilting angles: The low-temperature phase (M-C) has a c-axis parameter of 4.64 angstrom and a tilting angle (beta = 88.5 degrees) along the a axis, while the high-temperature phase (M-A) has a c-axis parameter of 4.66 angstrom and a tilting angle (beta = 86.8 degrees) along both of the a and b axes. We further show that samples undergoing the M-C-M-A phase transition exhibit ferroelectric polarization rotation and piezoelectric enhancement. Our findings directly unveil the close links between structural changes, polarization rotation, and large piezoelectricity at morphotropic phase boundaries in BiFeO3.
GPMiner: an integrated system for mining combinatorial cis-regulatory elements in mammalian gene group
(2012-01-17)
Lee, Tzong-Yi
;
Chang, Wen-Chi
;
Hsu, Justin Bo-Kai
;
Chang, Tzu-Hao
;
Shien, Dray-Ming
Background: Sequence features in promoter regions are involved in regulating gene transcription initiation. Although numerous computational methods have been developed for predicting transcriptional start sites (TSSs) or transcription factor (TF) binding sites (TFBSs), they lack annotations for do not consider some important regulatory features such as CpG islands, tandem repeats, the TATA box, CCAAT box, GC box, over-represented oligonucleotides, DNA stability, and GC content. Additionally, the combinatorial interaction of TFs regulates the gene group that is associated with same expression pattern. To investigate gene transcriptional regulation, an integrated system that annotates regulatory features in a promoter sequence and detects co-regulation of TFs in a group of genes is needed. Results: This work identifies TSSs and regulatory features in a promoter sequence, and recognizes co-occurrence of cis-regulatory elements in co-expressed genes using a novel system. Three well-known TSS prediction tools are incorporated with orthologous conserved features, such as CpG islands, nucleotide composition, over-represented hexamer nucleotides, and DNA stability, to construct the novel Gene Promoter Miner (GPMiner) using a support vector machine (SVM). According to five-fold cross-validation results, the predictive sensitivity and specificity are both roughly 80%. The proposed system allows users to input a group of gene names/symbols, enabling the co-occurrence of TFBSs to be determined. Additionally, an input sequence can also be analyzed for homogeneity of experimental mammalian promoter sequences, and conserved regulatory features between homologous promoters can be observed through cross-species analysis. After identifying promoter regions, regulatory features are visualized graphically to facilitate gene promoter observations. Conclusions: The GPMiner, which has a user-friendly input/output interface, has numerous benefits in analyzing human and mouse promoters. The proposed system is freely available at http://GPMiner.mbc.nctu.edu.tw/.