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Toxicity of organic mixtures containing cyanogenic toxicants
(1996-09-01)
Chen, CY
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Huang, CF
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環境工程研究所
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Institute of Environmental Engineering
In this study we evaluated the joint actions of cyanogenic toxicants with other organic chemicals using Microtox(R) tests. Experimental results indicated that greater than additive effect seldom occurred when these chemicals were mixed with nonreactive toxicants. However, the likelihood of synergistic effects exceeded 30% when reacting with a reactive chemical. Among the cyanogenic toxicants investigated in this study, malononitrile, lactonitrile, and alpha-hydroxy-isobutyronitrile have an approx. 50% likelihood of acting via synergism mode with other reactive toxicants. On the other hand, the joint actions related to acetonitrile and allyl cyanide are either additive or less than additive. Moreover, the likelihood of encountering synergistic effects markedly increases if the slopes of the dose-response curves for the two chemicals tested are small. Therefore, slope and certain characteristics of a chemical structure can apparently be used as indices to assess the potential hazard for a specific organic mixture. Furthermore, the complex joint action exerts a certain deterministic influence over the joint action mode of cyanogenic toxicants. This type of joint action, which quite frequently leads to an obvious antagonistic or even detoxification phenomena, could have some useful toxicological and pharmacological applications. Lastly, estimating the mixture toxicity on the basis of the concentration addition model is not always appropriate considering the high percentage of cases in this study showing synergism.
Persistent photoconductivity in SiGe/Si quantum wells
(1998-07-15)
Tsai, LC
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Huang, CF
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Fan, JC
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Chang, YH
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Chen, YF
Persistent photoconductivity (PPC) has been observed in boron-doped Si1-xGex/Si quantum wells. The decay kinetics of the PPC effect can be well described by a stretched-exponential function, I-ppc(t) = I-ppc(0)exp[-(t/tau)(beta)](0 < beta < 1), which is usually observed in many disorder materials. Through the studies of the PPC effect under various conditions, such as different temperature, different photon energy of photoexcitation, and different Ge content, we identify that the alloy potential fluctuations induced by compositional disorder are the origin of the PPC effect in Si1-xGex/Si quantum wells. (C) 1998 American Institute of Physics. [S0021-8979(98)00914-1].
Transport and optical studies of the D--conduction band in doped GaAs/AlGaAs quantum wells
(2001-08-01)
Lee, CH
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Chang, YH
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Huang, CF
;
Huang, MY
;
Lin, HH
The properties of D- ions in quantum wells were studied. It is found that, with an intermediate concentration of D- ions, electrons in the quantum wells possess both band-like and impurity-like properties. The appearance of the Quantum Hall effect makes it possible to rule out the existence of an impurity band that is separated from the conduction band. The results are interpreted in terms of the formation of a D- conduction band, with the D- band becoming a tail of the conduction band. The implications of our experimental results on the metal-insulator transitions in doped semiconductors are discussed.
Location tracking in a wireless sensor network by mobile agents and its data fusion strategies
(2003)
Tseng, YC
;
Kuo, SP
;
Lee, HW
;
Huang, CF
;
資訊工程學系
The wireless sensor network is an emerging technology that may greatly facilitate human life by providing ubiquitous sensing, computing, and communication capability, through which people can more closely interact with the environment wherever he/she goes. To be context-aware, one of the central issues in sensor networks is location tracking, whose goal is to monitor the roaming path of a moving object. While similar to the location-update problem in PCS networks, this problem is more challenging in two senses: (1) there are no central control mechanism and backbone network in such environment, and (2) the wireless communication bandwidth is very limited. In this paper, we propose a novel protocol based on the mobile agent paradigm. Once a new object is detected, a mobile agent will be initiated to track the roaming path of the object. The agent is mobile since it will choose the sensor closest to the object to stay. The agent may invite some nearby slave sensors to cooperatively position the object and inhibit other irrelevant (i.e., farther) sensors from tracking the object. As a result, the communication and sensing overheads are greatly reduced. Our prototyping of the location-tracking mobile agent based on IEEE 802.11b NICs and our experimental experiences are also reported.
An association mining method for time series and its application in the stock prices of TFT-LCD industry
(2004)
Huang, CF
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Chen, YC
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Chen, AP
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資訊管理與財務金融系註：原資管所+財金所
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Department of Information Management and Finance
TFT-LCD is one of industries currently promoted by the "Two Trillion and Twin Star Industries Development Plan" in Taiwan. This study endeavors to find out the stock price associations between the suppliers and manufacturers in the value chain of the TFT-LCD industry by means of data mining techniques, and meanwhile, to improve the Apriori algorithm so that it can facilitate association mining of discrete data points in a time series. An efficient data mining method which consists of two phases is proposed. In the first phase, data are classified and preprocessed using the algorithm proposed by R. Agrawal et al. (1996), then Apriori algorithm is applied to extract the strong association rules. The second phase further improves the Apriori algorithm by breaking down the traditional limitation of relying on pattern matching of continuous data for disclosing stock market behavior. By mining the association rules from the discrete data points in a time series and testing the corresponding hypotheses, statistically significant outcomes can be obtained. The proposed data mining method was applied to some real time-series of the stock prices of companies in the supply chain of TFT-LCD industry in Taiwan. It is suggested that a positive correlation does not necessarily exist between the companies' stock prices in the supply chain of TFT-LCD industry. For instance the result shows that, if the stock price of Sintek Phonrotic Corp., a company in the up stream of the value chain, soars for more than 5% in a day, the stock price of Tatung, a company in the down stream of the same value chain, may not respond positively accordingly. If an investor can short the stock of Tatung on the 7th day and long it back on the 10th day after Sintek's stock price soaring for more than 5%, the annual return of investment is 199.88% with 95% confidence interval. In conclusion, the results may reveal helpful information for the investors to make leveraged arbitrage profit investing decisions, and it might be interesting to apply this proposed data mining method to the time series in other industries or problems and investigate the results further.
Increasing the throughput of multihop Packet Radio Networks with power adjustment
(2001)
Huang, CF
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Tseng, YC
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Wu, SL
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Sheu, JP
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資訊工程學系
The Packet Radio Network (PRN) is an attractive architecture to support mobile and wireless communication. Although the code assignment problem has been studied extensively on PRN, we observe in this paper that the power control problem has been ignored by most works, but may have significant impact on performance. By power control, we mean that the transmission ranges of stations are tunable. We show given a PRN in which each host already received a code, how to adjust the powers of stations to control/improve the topology of the PRN without violating the original code assignment. Several schemes are proposed. Through simulations, we demonstrate that although the code assignment problem is NP-complete and thus computationally very expensive, using our power adjustment schemes can easily improve the network performance by about 20% with polynomial costs.
A two-tier heterogeneous mobile ad hoc network architecture and its load-balance routing problem
(2003)
Huang, CF
;
Lee, HW
;
Tseng, YC
;
資訊工程學系
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Department of Computer Science
The mobile ad hoc network- (MANET) has attracted a lot of interest recently. However, most of the existing works have assumed a stand-alone MANET. In this paper, we propose a two-tier, heterogeneous MANET architecture which can support Internet access. The low tier of the network consists of a set of mobile hosts each equipped with a IEEE 802.11 wireless LAN card. In order to connect to the Internet and handle the network partitioning problem, we propose that the high tier is comprised of a subset of the mobile hosts, called gateways, which can access to cellular/infrastructure networks. The high tier is heterogeneous in the sense that the network interfaces in the gateway hosts could be IEEE 802.11 cards, PHS handsets, or GPRS handsets characterized by different bandwidths and latencies. Observing that the gateways could become the bottlenecks of the two-tier network, we propose a set of solutions, namely boundary-moving and host-partitioning solutions, to solve the load-balance routing issue. Implementation issues/concerns of these schemes are discussed. Simulation results are presented to compare these load-balance routing schemes.
Constructing control process for wafer defects using data mining technique
(2004)
Tong, L
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Lee, H
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Huang, CF
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Lin, CK
;
Yang, CH
The wafer defects influence the yield of a wafer. The integrated circuits (IC) manufacturers usually use a Poisson distribution based c-chart to monitor the lot-to-lot wafer defects. As the wafer size increases, defects on wafer tend to cluster. When the c-chart is used, the clustered defects frequently cause erroneous results. The main objective of this study is to develop a hierarchical adaptive control process to monitor the clustered defects effectively and detect the wafer-to-wafer variation and lot-to-lot variation simultaneously using data mining technique.
Design and implementation of two-tier Mobile Ad Hoc Networks with seamless roaming and load-balancing routing capability
(2004)
Hsu, YY
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Tseng, YC
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Tseng, CC
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Huang, CF
;
Fan, JH
Due to its flexibility, Mobile Ad Hoc Network (MANET) has attracted a lot of attention recently. Most existing works, however, limit a MANET as a stand-alone network. In this paper, we propose a two-tier MANET by extending the connectivity of the MANET to the Internet. Some hosts in the MANET are equipped with cellular interfaces and are called gateways, which can provide Internet connections. Such extension would greatly improve the connectivity of MANET To maintain seamless connectivity, we modify the Mobile IP to make traversing private networks (i.e., NAT) of cellular networks possible. We also propose a load-balancing routing protocol to utilize the cellular interfaces of gateways, which are likely to be bottlenecks to the Internet. A prototype is implemented and performance results obtained from the testbed is reported.
High thermal stability metal gate with tunable work function
(2004)
Huang, CF
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Tsui, BY
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
It has been reported that the work function of Ta-Pt alloys is tunable and Ta-Pt is a possible gate material for CMOS devices. In this work, we demonstrate that the Ta-Pt alloy is thermally stable up to 900degreesC. The impact of oxygen contamination and thermal stress on the stability of the MOS structure with the alloy gate is also discussed. It is concluded that the Ta-Pt alloy is a good candidate for gate electrode in the nanoscale CMOS regime and is compatible with the conventional self-aligned process.

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