排序方式: 共有26条查询结果,搜索用时 31 毫秒
1.
Wen-Shiung Lee Gwo-Hshiung Tzeng Jyh-Liang Guan Kuo-Ting Chien Juan-Ming Huang 《Expert systems with applications》2009,36(3):6421-6430
Basing on the Gordon model perspective and applying multiple criteria decision making (MCDM), this research explores the influential factors and relative weight of dividend, discount rate, and dividend growth rate. The purpose is to establish an investment decision model and provides investors with a reference/selection of stocks most suitable for investing effects to achieve the greatest returns. Taking full consideration of the interrelation effect among variables of the decision model, this paper introduced analytical network process (ANP) and examined leading electronics companies spanning the hottest sectors of lens, solar, and handset by experts. Empirical findings indicated that dividend was affected by industry outlook, earnings, operating cash flow, and dividend payout rate; discount rate was affected by market β and risk-free rate; and dividend growth rate was affected by earnings growth rate and dividend payout growth rate. Also, according to literatures, discount rate possessed a self-effect relationship. Among the eight evaluation criteria, market β was the most important factor influencing investment decisions, followed by dividend growth rate and risk-free rate. In stock evaluations, leadership companies in the solar industry outperformed those in handset and lens, becoming investors’ favorite stock group at the time that this research was conducted. 相似文献
2.
Biomedical waveforms, such as electrocardiogram (ECG) and arterial pulse, always possess a lot of important clinical information in medicine and are usually recorded in a long period of time in the application of telemedicine. Due to the huge amount of data, to compress the biomedical waveform data is vital. By recognizing the strong similarity and correlation between successive beat patterns in biomedical waveform sequences, an efficient data compression scheme mainly based on pattern matching is introduced in this paper. The waveform codec consists mainly of four units: beat segmentation, beat normalization, two-stage pattern matching and template updating and residual beat coding. Three different residual beat coding methods, such as Huffman/run-length coding, Huffman/run-length coding in discrete cosine transform domain, and vector quantization, are employed. The simulation results show that our compression algorithms achieve a very significant improvement in the performances of compression ratio and error measurement for both ECG and pulse, as compared with some other compression methods. 相似文献
3.
Tsai Jung-Hui Lour Wen-Shiung Guo Der-Feng Liu Wen-Chau Wu Yi-Zhen Dai Ying-Feng 《Semiconductors》2010,44(8):1096-1100
High-performance InP/GaAsSb double heteroj unction bipolar transistor (DHBT) employing GaAsSb/lnGaAs superlattice-base structure
is demonstrated and compared with GaAsSb bulk-base structure by two-dimensional simulation analysis. The proposed device exhibits
a higher current gain of 257 than the conventional InP/GaAsSb type-II DHBT with a lower current gain of 180, attributed to
the tynneling behavior of minority carriers in the GaAsSb/lnGaAs superlattice-base region under large forward base—emitter
bias. In addition, a larger unity gain cutoff frequency of 19.1 GHz is botained for the superlattice-base device than that
of 17.2 GHz for the bulk-base device. 相似文献
4.
Wen-Chau Liu Jung-Hui Tsai Wen-Shiung Lour Lih-Wen Laih Shiou-Ying Cheng Kong-Beng Thei Cheng-Zu Wu 《Electron Devices, IEEE Transactions on》1997,44(4):520-525
In this paper, a novel InGaP/GaAs multiple S-shaped negative-differential-resistance (NDR) switch based on a heterostructure-emitter bipolar transistor (HEBT) structure is fabricated and demonstrated. An interesting multiple NDR phenomenon resulting from an avalanche multiplication and successive two-stage barrier lowering process is observed under the inverted operation mode. The three-terminal-controlled and temperature-dependent NDR characteristics are also investigated. In addition, a typical transistor performance is found under the normal operation mode. Consequently, owing to the presented different stable operation points and transistor action, the studied device shows a good potential for multiple-valued logic and analog amplification circuit applications 相似文献
5.
Wen-Chau Liu Lih-Wen Laih Wen-Shiung Lour Jun-Hui Tsai Kun-Wei Lin Chin-Chuan Cheng 《Quantum Electronics, IEEE Journal of》1996,32(9):1615-1619
A new GaAs-InxGa1-xAs metal-insulator-semiconductor-like (MIS) device with the interesting dual-route and multiple-negative-differential-resistance (MNDR) current-voltage (I-V) characteristics has been fabricated and demonstrated. These performances are caused by the successive barrier lowering and potential redistribution effect. A novel multiple-route I-V characteristic is obtained in the studied device at low temperature (-130°C). This performance is different from the previously reported NDR switching device and has not yet been found in other devices. The interesting property of the studied structure provides a promising candidate for switching device applications 相似文献
6.
Wen-Chau Liu Wen-Lung Chang Wen-Shiung Lour Shiou-Ying Cheng Yung-Hsin Shie Jing-Yuh Chen Wei-Chou Wang Hsi-Jen Pan 《Electron Device Letters, IEEE》1999,20(6):274-276
We reported a newly designed double delta-doped GaInP/InGaAs pseudomorphic HEMT with high temperature-dependent performances. In addition to the novel aspects of the proposed HEMT structure, temperature-dependent behaviors including a high-voltage (40 V) and a low-leakage current (17 nA/mm) are further improved by eliminating mesa-sidewall effect. We obtained nearly current-independent transconductance in the temperature of 300-450 K. The measured current gain cutoff frequency fT and maximum oscillation frequency f max for a 1-μm gate device are 12 and 28.4 GHz, respectively 相似文献
7.
Wen-Chau Liu Wen-Lung Chang Wen-Shiung Lour Kuo-Hui Yu Kun-Wei Lin Chin-Chuan Cheng Shiou-Ying Cheng 《Electron Devices, IEEE Transactions on》2001,48(7):1290-1296
A newly designed inverted delta-doped V-shaped GaInP/InxGa1-xAs/GaAs pseudomorphic high electron mobility transistor (PHEMT) has been successfully fabricated and studied. For a 1×100 μm2 device, a high gate-to-drain breakdown voltage over 30 V at 300 K is found. In addition, a maximum transconductance of 201 mS/mm with a broad operation regime for 3 V of gate bias (565 mA/mm of drain current density), a very high output drain saturation current density of 826 mA/mm, and a high DC gain ratio of 575 are obtained. Furthermore, good temperature-dependent performances at the operating temperature ranging from 300 to 450 K are found. The unity current gain cutoff frequency fT and maximum oscillation frequency fmax up to 16 and 34 GHz are obtained, respectively. Meanwhile, the studied device shows the significantly wide and flat gate bias operation regime (3 V) for microwave performances 相似文献
8.
Hsu Che-Hao Cheng Wen-Huang Wu Yi-Leh Huang Wen-Shiung Mei Tao Hua Kai-Lung 《Multimedia Tools and Applications》2017,76(23):24961-24981
Multimedia Tools and Applications - This paper presents a novel multi-functional, low-cost handheld multi-camera system (one dimensional camera array) - “CrossbowCam”. The CrossbowCam... 相似文献
9.
In this article, a novel InGaP/GaAs pnp δ-doped heterojunction bipolar transistor is first demonstrated. Though the valence band discontinuity at InGaP/GaAs heterojunction
is relatively large, the addition of a δ-doped sheet between two spacer layers at the emitter-base (E-B) junction effectively
eliminates the potential spike and increases the confined barrier for electrons, simultaneously. Experimentally, a high current
gain of 25 and a relatively low E-B offset voltage of 60 mV are achieved. The offset voltage is much smaller than the conventional
InGaP/GaAs pnp HBT. The proposed device could be used for linear amplifiers and low-power complementary integrated circuit applications.
The article is published in the original. 相似文献
10.
Shao-Yen Chiu Hsuan-Wei Huang Tze-Hsuan Huang Kun-Chieh Liang Kang-Ping Liu Jung-Hui Tsai Wen-Shiung Lour 《International Journal of Hydrogen Energy》2009
This paper reviews both static and dynamic characteristics of a planar-type Pd–GaN metal–semiconductor–metal (MSM) hydrogen sensor. The sensing mechanism of a metal–semiconductor (MS) hydrogen sensor was firstly reviewed to realize the sensing mechanism of the proposed sensor. Symmetrically bi-directional current–voltage characteristics associated with our sensor were indicative of easily integrating with other electrical/optical devices. In addition to the sensing current, the sensing voltage was also used as detecting signals in this work. With regard to sensing currents (sensing voltages), the proposed sensor was biased at a constant voltage (current) in a wide range of hydrogen concentration from 2.13 to 10,100 ppm H2/N2. Experimental results reveal that the proposed sensor exhibits effective barrier height variations (sensing responses) of 134 (173) and 20 mV (1) at 10,100 and 2.13 ppm H2/N2, respectively. A sensing voltage variation as large as 18 V was obtained at 10,100 ppm H2/N2, which is the highest value ever reported. If an accepted sensing voltage variation is larger than 3 (5) V, the detecting limit is 49.1 (98.9) ppm. Moreover, voltage transient response and current transient response to various hydrogen-containing gases were experimentally studied. The new finding is that the former response time is shorter than the latter one. Other dynamic measurements by switching voltage polarity and/or continuously changing hydrogen concentration were addressed, showing the proposed sensor is a good candidate for commonly used MS sensors. 相似文献