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Shih-Jung Wang
Graduate Institute of Applied Geology, National Central University, 300 Zhongda Road, Zhongli District, Taoyuan 32001, Taiwan

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Journal article
Published: 22 April 2021 in Water
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Climate change can directly or indirectly influence groundwater resources. The mechanisms of this influence are complex and not easily quantified. Understanding the effect of climate change on groundwater systems can help governments adopt suitable strategies for water resources. The baseflow concept can be used to relate climate conditions to groundwater systems for assessing the climate change impact on groundwater resources. This study applies the stable baseflow concept to the estimation of the groundwater recharge in ten groundwater regions in Taiwan, under historical and climate scenario conditions. The recharge rates at the main river gauge stations in the groundwater regions were assessed using historical data. Regression equations between rainfall and groundwater recharge quantities were developed for the ten groundwater regions. The assessment results can be used for recharge evaluation in Taiwan. The climate change estimation results show that climate change would increase groundwater recharge by 32.6% or decrease it by 28.9% on average under the climate scenarios, with respect to the baseline quantity in Taiwan. The impact of climate change on groundwater systems may be positive. This study proposes a method for assessing the impact of climate change on groundwater systems. The assessment results provide important information for strategy development in groundwater resources management.

ACS Style

Shih-Jung Wang; Cheng-Haw Lee; Chen-Feng Yeh; Yong Choo; Hung-Wei Tseng. Evaluation of Climate Change Impact on Groundwater Recharge in Groundwater Regions in Taiwan. Water 2021, 13, 1153 .

AMA Style

Shih-Jung Wang, Cheng-Haw Lee, Chen-Feng Yeh, Yong Choo, Hung-Wei Tseng. Evaluation of Climate Change Impact on Groundwater Recharge in Groundwater Regions in Taiwan. Water. 2021; 13 (9):1153.

Chicago/Turabian Style

Shih-Jung Wang; Cheng-Haw Lee; Chen-Feng Yeh; Yong Choo; Hung-Wei Tseng. 2021. "Evaluation of Climate Change Impact on Groundwater Recharge in Groundwater Regions in Taiwan." Water 13, no. 9: 1153.

Journal article
Published: 13 February 2021 in Computers and Geotechnics
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The fundamental study of coupled thermal–hydraulic-mechanical (THM) systems is an important issue in multi-physical fields. This study developed a THM model in which the hydraulic and mechanical effects are fully coupled and the temperature change serves as the perturbation source of the system. A porothermoelasticity model was applied to investigate the cross-interactions among the temperature, change in pore water pressure, and displacement of a buffer material in the near-field and a host rock in the far-field with the conceptual model in a nuclear waste repository. The results show that the size scale of the domain of interest and the THM properties play important roles in the coupled THM system. The changes in pore water pressure depended on the combined effect of the deformation of the porous space and pore water controlled by the thermal expansion coefficients of the solids and fluids. Stochastic analyses show that the uncertainties of variables varied spatio-temporally due to the thermal influences and approached zero due to the presence of a stable condition. The cross-interactions between displacement and change in pore water pressure induced by the thermal effect were complex and can be determined from statistical moment analyses.

ACS Style

Shih-Jung Wang; Jian-Yu Chen; Kuo-Chin Hsu. Investigation of cross-interactions of coupled thermal-hydraulic-mechanical model using stochastic simulations. Computers and Geotechnics 2021, 133, 104020 .

AMA Style

Shih-Jung Wang, Jian-Yu Chen, Kuo-Chin Hsu. Investigation of cross-interactions of coupled thermal-hydraulic-mechanical model using stochastic simulations. Computers and Geotechnics. 2021; 133 ():104020.

Chicago/Turabian Style

Shih-Jung Wang; Jian-Yu Chen; Kuo-Chin Hsu. 2021. "Investigation of cross-interactions of coupled thermal-hydraulic-mechanical model using stochastic simulations." Computers and Geotechnics 133, no. : 104020.

Conference paper
Published: 22 April 2020 in Proceedings of the International Association of Hydrological Sciences
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Pingtung coastal plain, located at the active convergent boundary between Philippine Sea Plate and Eurasian Plate, is one of the most active areas regarding tectonic deformation in Taiwan. Groundwater over-pumping for aquaculture along the coast area of Pingtung plain induced a serious land subsidence problem for decades. How much land subsidence contributed by tectonic activity and groundwater pumping is a crucial issue for tectonic study and groundwater management in this area. This study collected the data in different fields and proposed a conceptual model to calculate the quantities of land subsidence caused by natural (tectonic) and human (pumping) factors. The data from the Global Positioning System (GPS) are used to illustrate the total subsidence concerning vertical displacement. A system called the multi-level compaction monitoring well (MCMW) is able to measure the vertical compaction in different depths from the earth surface to the depth of 200 m. Two GPS stations, named CLON and FALI, close to two MCMWs, named Jiadong and Fangliao, are adopted for analysis The data during 2007 and 2016 taken from MCMWs and groundwater observation wells indicate that the compaction in the shallow depth should be mainly caused by groundwater over-pumping due to their high correlation coefficients (from 0.58–0.95). The difference of the vertical deformation between GPS and MCMW indicates that there is deformation beyond the depth within 200 m. From the data and literature, the further vertical deformation should be due to tectonic activity associated with tectonic escape and extrusion of the Taiwan orogen with average vertical deformation from −3.0 to −4.4 mm. Therefore, the quantities of land subsidence contributed by local groundwater over-pumping and regional tectonic activities are successfully separated. The method and concept proposed in this study can be used in land subsidence quantification due to both tectonic activity and groundwater over-pumping.

ACS Style

Duc-Huy Tran; Shih-Jung Wang. Land subsidence due to groundwater extraction and tectonic activity in Pingtung Plain, Taiwan. Proceedings of the International Association of Hydrological Sciences 2020, 382, 361 -365.

AMA Style

Duc-Huy Tran, Shih-Jung Wang. Land subsidence due to groundwater extraction and tectonic activity in Pingtung Plain, Taiwan. Proceedings of the International Association of Hydrological Sciences. 2020; 382 ():361-365.

Chicago/Turabian Style

Duc-Huy Tran; Shih-Jung Wang. 2020. "Land subsidence due to groundwater extraction and tectonic activity in Pingtung Plain, Taiwan." Proceedings of the International Association of Hydrological Sciences 382, no. : 361-365.

Preprint content
Published: 23 March 2020
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Hydrological anomalies induced by the earthquakes are valuable research data to understand the hydrogeology structure. At the same time, a complete hydrogeological data is the key to the study of earthquake hydrology. In this research, we collected the anomalous hydrological data after the Mw 6.4 2016 Meinong Earthquake in Taiwan. The main purpose is to know the mechanism of hydrological changes triggered by earthquake and understand the local hydrogeological characteristics in the southern Taiwan.

From the distribution of the groundwater level change in the same location but different depths of aquifer, as well as the location of the rupture and liquefaction, it could be found that the co-seismic groundwater level change is large in Chianan Plain in the northwest of the epicenter and accompanied with a lot of ruptures and liquefactions located along the Hsinhua Fault. However, the observations in several wells around the Hsinhua Fault show a different water level change pattern compared with the other wells in Chianan Plain. Actually, these wells show that the co-seismic groundwater level decreases in the deep aquifer and increase in the shallow aquifer. It is shown that the Meinong Earthquake may enhance the connectivity between different aquifers near the fault zone and produce an increased vertical pressure gradient. The anomalous hydrological phenomenon also reflected in the river flow. Based on the river flow data we collected from five stations in the Zengwun River watershed, the river flow at two stations in the upstream dose not change after earthquake. There is a little increase at the midstream station. However, a large river flow increase is observed at the downstream station. After excluding the influence of rainfall, we think that the large amount of anomalous flow is caused by the rise of the co-seismic groundwater level between the middle and downstream sections, and a large amount of liquefaction in this area can prove this hypothesis.

The hypothesis of connectivity changes between different aquifers can be verified by analyzing the tidal response of different aquifers. Many studies have used the tide analysis to obtain the aquifer permeability and compressibility, and compared the changes in the analysis results before and after the earthquake. We think that if different aquifers are vertically connected after earthquake, the tidal analysis results should show a consistent permeability. Tidal analysis is executing now and the results will be provided at conference.

ACS Style

Yan-Yao Lin; Shih-Jung Wang; Wen-Chi Lai. The research of Meinong earthquake induced hydrological anomalies and increased vertical permeability in southwestern Taiwan. 2020, 1 .

AMA Style

Yan-Yao Lin, Shih-Jung Wang, Wen-Chi Lai. The research of Meinong earthquake induced hydrological anomalies and increased vertical permeability in southwestern Taiwan. . 2020; ():1.

Chicago/Turabian Style

Yan-Yao Lin; Shih-Jung Wang; Wen-Chi Lai. 2020. "The research of Meinong earthquake induced hydrological anomalies and increased vertical permeability in southwestern Taiwan." , no. : 1.

Conference paper
Published: 06 July 2017 in Poromechanics VI
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This study uses a thermal uncoupled thermal-hydraulic-mechanical (THM) model to investigate the interactive behavior of change in pore water pressure, displacement, and temperature of a buffer material in the near-field of the nuclear waste repository. The variation of pore water pressure is contributed to both the deformations of porous space and the swelling of pore water. The deformations are controlled by the thermal expansion coefficients of solid and fluid. Stochastic analysis is performed by using Monte Carlo simulations. The variances of displacement and change in pore water pressure vary spatial-temporally. The variances expresses the variation of displacement and change in pore water pressure in the domain and provides the uncertainty information. The proposed stochastic THM analysis provides a tool for the uncertainty assessment of the nuclear waste repository.

ACS Style

Shih-Jung Wang; Kuo-Chin Hsu; Matthieu Vandamme; Patrick Dangla; Jean-Michel Pereira; Siavash Ghabezloo. Stochastic Analysis of a Thermal Uncoupled Thermal-Hydraulic-Mechanical Model. Poromechanics VI 2017, 1 .

AMA Style

Shih-Jung Wang, Kuo-Chin Hsu, Matthieu Vandamme, Patrick Dangla, Jean-Michel Pereira, Siavash Ghabezloo. Stochastic Analysis of a Thermal Uncoupled Thermal-Hydraulic-Mechanical Model. Poromechanics VI. 2017; ():1.

Chicago/Turabian Style

Shih-Jung Wang; Kuo-Chin Hsu; Matthieu Vandamme; Patrick Dangla; Jean-Michel Pereira; Siavash Ghabezloo. 2017. "Stochastic Analysis of a Thermal Uncoupled Thermal-Hydraulic-Mechanical Model." Poromechanics VI , no. : 1.

Journal article
Published: 23 March 2017 in Groundwater
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The hydraulic properties of aquitards are not easily obtained because monitoring wells are usually installed in aquifers for groundwater resources management. Earthquake-induced crust stress (strain) triggers groundwater level variations over a short period of time in a large area. These groundwater anomalies can be used to investigate aquifer systems. This study uses a poroelastic model to fit the postseismic variations of groundwater level triggered by the Chi-Chi earthquake to evaluate the hydraulic properties of aquitards in the Jhoushuei River alluvial fan (JRAF), Taiwan. Six of the adopted eight wells with depths of 70 to 130 m showed good agreement with the recovery theory. The mean hydraulic conductivities (K) of the aquifers for the eight wells are 1.62 × 10−4 to 9.06 × 10−4 m/s, and the thicknesses are 18.8 to 46.1 m. The thicknesses of the aquitards are 11.3 to 42.0 m. Under the isotropic assumption for K, the estimated values of K for the aquitards are 3.0 × 10−8 to 2.1 × 10−6 m/s, corresponding to a silty medium. The results match the values obtained for the geological material of the drilling core and those reported in previous studies. The estimated values were combined with those given in previous studies to determine the distribution of K in the first two aquitards in the JRAF. The distribution patterns of the aquitards reflect the sedimentary environments and fit the geological material. The proposed technique can be used to evaluate the K value of aquitards using inverse methods. The inversion results can be used in hydrogeological analyses, contaminant modeling, and subsidence evaluation.

ACS Style

Shih‐Jung Wang; Kuo‐Chin Hsu; Wen‐Chi Lai. Evaluation of Hydraulic Properties of Aquitards Using Earthquake-Triggered Groundwater Variation. Groundwater 2017, 55, 747 -756.

AMA Style

Shih‐Jung Wang, Kuo‐Chin Hsu, Wen‐Chi Lai. Evaluation of Hydraulic Properties of Aquitards Using Earthquake-Triggered Groundwater Variation. Groundwater. 2017; 55 (5):747-756.

Chicago/Turabian Style

Shih‐Jung Wang; Kuo‐Chin Hsu; Wen‐Chi Lai. 2017. "Evaluation of Hydraulic Properties of Aquitards Using Earthquake-Triggered Groundwater Variation." Groundwater 55, no. 5: 747-756.

Conference paper
Published: 12 November 2015 in Proceedings of the International Association of Hydrological Sciences
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The Taiwan Water Resources Agency uses four techniques to monitor subsidence in Taiwan, namely data from leveling, global positioning system (GPS), multi-level compaction monitoring wells (MCMWs), and interferometry synthetic aperture radar (InSAR). Each data type has advantages and disadvantages and is suitable for different analysis tools. Only MCMW data provide compaction information at different depths in an aquifer system, thus they are adopted in this study. However, the cost of MCMW is high and the number of MCMW is relatively low. Leveling data are thus also adopted due to its high resolution and accuracy. MCMW data provide compaction information at different depths and the experimental data from the wells provide the physical properties. These data are suitable for a physical model. Leveling data have high monitoring density in spatial domain but lack in temporal domain due to the heavy field work. These data are suitable for a black- or grey-box model. Poroelastic theory, which is known to be more conscientious than Terzaghi's consolidation theory, is adopted in this study with the use of MCMW data. Grey theory, which is a widely used grey-box model, is adopted in this study with the use of leveling data. A fusion technique is developed to combine the subsidence predicted results from poroelastic and grey models to obtain a spatially and temporally connected two-dimensional subsidence distribution. The fusion model is successfully applied to subsidence predictions in Changhua, Yunlin, Tainan, and Kaohsiung of Taiwan and obtains good results. A good subsidence model can help the government to make the accurate strategies for land and groundwater resource management.

ACS Style

S.-J. Wang; K.-C. Hsu; C.-H. Lee. A fusion model used in subsidence prediction in Taiwan. Proceedings of the International Association of Hydrological Sciences 2015, 372, 463 -469.

AMA Style

S.-J. Wang, K.-C. Hsu, C.-H. Lee. A fusion model used in subsidence prediction in Taiwan. Proceedings of the International Association of Hydrological Sciences. 2015; 372 ():463-469.

Chicago/Turabian Style

S.-J. Wang; K.-C. Hsu; C.-H. Lee. 2015. "A fusion model used in subsidence prediction in Taiwan." Proceedings of the International Association of Hydrological Sciences 372, no. : 463-469.

Journal article
Published: 01 November 2015 in Journal of Asian Earth Sciences
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ACS Style

Shih-Jung Wang; Kuo-Chin Hsu; Wen-Chi Lai; Chein-Lee Wang. Estimating the extent of stress influence by using earthquake triggering groundwater level variations in Taiwan. Journal of Asian Earth Sciences 2015, 111, 373 -383.

AMA Style

Shih-Jung Wang, Kuo-Chin Hsu, Wen-Chi Lai, Chein-Lee Wang. Estimating the extent of stress influence by using earthquake triggering groundwater level variations in Taiwan. Journal of Asian Earth Sciences. 2015; 111 ():373-383.

Chicago/Turabian Style

Shih-Jung Wang; Kuo-Chin Hsu; Wen-Chi Lai; Chein-Lee Wang. 2015. "Estimating the extent of stress influence by using earthquake triggering groundwater level variations in Taiwan." Journal of Asian Earth Sciences 111, no. : 373-383.

Journal article
Published: 15 July 2015 in IEEE Transactions on Wireless Communications
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Combating the intersymbol interference is an important issue in single-carrier block transmission systems. To exploit the advantages of frequency-domain (FD) processing, we propose in this paper a hybrid-domain sequence detector that combines FD prefiltering with time-domain tree search detection. The proposed algorithm achieves a detection performance that is very close to that of the conventional tree search equalizers (which employ the QRD-M or sphere decoding algorithm), but with a much lower complexity. In addition, the proposed algorithm performs significantly better than the decision-feedback equalizer, with only a modest increase in complexity.

ACS Style

Jiun-Jie Jia; Shih-Jung Wang; Kuei-Chiang Lai; Jia J.; Wang S.; Lai K.. Hybrid-Domain Sequence Detector for Training Sequence-Aided Single-Carrier Block Transmission Signals. IEEE Transactions on Wireless Communications 2015, 14, 6565 -6578.

AMA Style

Jiun-Jie Jia, Shih-Jung Wang, Kuei-Chiang Lai, Jia J., Wang S., Lai K.. Hybrid-Domain Sequence Detector for Training Sequence-Aided Single-Carrier Block Transmission Signals. IEEE Transactions on Wireless Communications. 2015; 14 (12):6565-6578.

Chicago/Turabian Style

Jiun-Jie Jia; Shih-Jung Wang; Kuei-Chiang Lai; Jia J.; Wang S.; Lai K.. 2015. "Hybrid-Domain Sequence Detector for Training Sequence-Aided Single-Carrier Block Transmission Signals." IEEE Transactions on Wireless Communications 14, no. 12: 6565-6578.

Communication
Published: 11 May 2015 in Entropy
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Physical models and grey system models (GSMs) are commonly used to evaluate and predict physical behavior. A physical model avoids the incorrect trend series of a GSM, whereas a GSM avoids the assumptions and uncertainty of a physical model. A technique that combines the results of physical models and GSMs would make prediction more reasonable and reliable. This study proposes a fusion method for combining two trend series, calculated using two one-dimensional models, respectively, that uses a slope criterion and a distance weighting factor in the temporal and spatial domains. The independent one-dimensional evaluations are upgraded to a spatially and temporally connected two-dimensional distribution. The proposed technique was applied to a subsidence problem in Jhuoshuei River Alluvial Fan, Taiwan. The fusion results show dramatic decreases of subsidence quantity and rate compared to those estimated by the GSM. The subsidence behavior estimated using the proposed method is physically reasonable due to a convergent trend of subsidence under the assumption of constant discharge of groundwater. The technique proposed in this study can be used in fields that require a combination of two trend series from physical and nonphysical models.

ACS Style

Shih-Jung Wang. Dimensional Upgrade Approach for Spatial-Temporal Fusion of Trend Series in Subsidence Evaluation. Entropy 2015, 17, 3035 -3052.

AMA Style

Shih-Jung Wang. Dimensional Upgrade Approach for Spatial-Temporal Fusion of Trend Series in Subsidence Evaluation. Entropy. 2015; 17 (5):3035-3052.

Chicago/Turabian Style

Shih-Jung Wang. 2015. "Dimensional Upgrade Approach for Spatial-Temporal Fusion of Trend Series in Subsidence Evaluation." Entropy 17, no. 5: 3035-3052.

Journal article
Published: 28 February 2015 in Environmental Earth Sciences
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Tainan, located in southwestern Taiwan, is a high-risk region for flooding and climate change effect and has a potential for future heavy rains. Groundwater pumping for aquaculture and irrigation along the coastal plain of Tainan is monitored due to subsidence. Predicting future subsidence and understanding the effect of climate change on subsidence can assist with regard to the planning and management of water and land resources in the early stages of subsidence, whose possible damage can thus be avoided. This study combines a physical model, called the nonlinear poroelastic model, and a gray-box model, called the gray system model, to evaluate and predict subsidence in the Tainan area. The subsidence under the climate change effect caused by changes in groundwater use is estimated. The climate change impact on subsidence and the potential for subsidence hazards are also analyzed. When taking into consideration the climate change effect, it is predicted that subsidence in Tainan will increase with increasing groundwater use. The maximum subsidence will increase from 29 cm (without additional discharge) to 34 cm (with additional 23.6 % discharge) and 35 cm (with additional 31.7 % discharge) in Xiaying District by 2039. The pattern of subsidence areas obtained by combining the nonlinear poroelastic and the gray system models is similar to that obtained using only the gray system model. However, the largest subsidence areas are different, and the subsidence quantity is much lower for the former due to the constraint of the physics-based poroelastic model. The combination of the nonlinear poroelastic model and the gray system model gives more reasonable estimations than either model can give alone. Large subsidence impact areas are located in the northwestern part of Tainan, and the largest impact is in Xiaying District. The potential for subsidence hazards is classified from the subsidence rates. The subsidence rate in Tainan is below 3 cm/year in the target years, and thus the potential for subsidence hazards is at middle and low levels. With climate change, the area with a middle level of potential for subsidence hazards extends across Yanshui, Xiaying, and Beimen Districts. From the study results, although the subsidence quantity is relatively low, rising sea levels and other effects of climate change expose Tainan to a high risk of flooding. Land and water resources should thus be managed to alleviate subsidence problems in the future.

ACS Style

Shih-Jung Wang; Cheng-Haw Lee; Jung-Wei Chen; Kuo-Chin Hsu. Combining gray system and poroelastic models to investigate subsidence problems in Tainan, Taiwan. Environmental Earth Sciences 2015, 73, 7237 -7253.

AMA Style

Shih-Jung Wang, Cheng-Haw Lee, Jung-Wei Chen, Kuo-Chin Hsu. Combining gray system and poroelastic models to investigate subsidence problems in Tainan, Taiwan. Environmental Earth Sciences. 2015; 73 (11):7237-7253.

Chicago/Turabian Style

Shih-Jung Wang; Cheng-Haw Lee; Jung-Wei Chen; Kuo-Chin Hsu. 2015. "Combining gray system and poroelastic models to investigate subsidence problems in Tainan, Taiwan." Environmental Earth Sciences 73, no. 11: 7237-7253.

Journal article
Published: 07 January 2015 in Environmental Earth Sciences
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Subsidence in Yunlin County, Taiwan, is serious and continuous. The Taiwan High Speed Rail (THSR) route crosses the subsidence area and might be affected by differential settlements. It is important to evaluate the pumping quantity for water resource management and to predict the subsidence for land resource management to mitigate the subsidence problem in Taiwan. This study combines first-order second-moment (FOSM) stochastic poroelastic theory with nonlinear parameters to develop a FOSM nonlinear stochastic poroelastic model and applies it to quantify groundwater pumping and future subsidence with uncertainty. The additional loading and discharge are evaluated by fitting the subsidence historical data to the numerical model. The results show that the proposed model well describes the subsidence behavior and quantifies groundwater pumping. However, the numerical results are larger than the monitoring data at various depths, which might be due to the different compaction situations in individual formations of the aquifer system. The predicted subsidence at the Yuanchang monitoring well is the largest (0.32 ± 0.52 m in 2020) with consideration of the climate change effects, achieved by adding an additional discharge of 31.7 %. The large uncertainty is caused by the large variation of hydraulic conductivity caused by the heterogeneity of the aquifer system, which could be improved by doing more experiments or using a conditioned model. The information provided in this study is useful for the safety of THSR and for land and groundwater resource management in Yunlin County, Taiwan.

ACS Style

Shih-Jung Wang; Cheng-Haw Lee; Kuo-Chin Hsu. A technique for quantifying groundwater pumping and land subsidence using a nonlinear stochastic poroelastic model. Environmental Earth Sciences 2015, 73, 8111 -8124.

AMA Style

Shih-Jung Wang, Cheng-Haw Lee, Kuo-Chin Hsu. A technique for quantifying groundwater pumping and land subsidence using a nonlinear stochastic poroelastic model. Environmental Earth Sciences. 2015; 73 (12):8111-8124.

Chicago/Turabian Style

Shih-Jung Wang; Cheng-Haw Lee; Kuo-Chin Hsu. 2015. "A technique for quantifying groundwater pumping and land subsidence using a nonlinear stochastic poroelastic model." Environmental Earth Sciences 73, no. 12: 8111-8124.

Conference paper
Published: 01 May 2014 in 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
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Combating the intersymbol interference is an important issue in single-carrier block transmission systems. In this paper, we present a nonlinear equalizer that combines frequency-domain (FD) pre-filtering with time-domain tree search detection. Simulation results show that the proposed algorithm achieves a detection performance that is very close to that of the conventional tree search equalizer (which employs the QRD-M algorithm), but with a much lower complexity. In addition, the proposed algorithm performs significantly better than the linear equalizers and decision-feedback equalizers, with only a modest increase in complexity.

ACS Style

Shih-Jung Wang; Jiun-Jie Jia; Kuei-Chiang Lai; Szu-Lin Su. A nonlinear equalization algorithm for single-carrier block transmission systems. 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) 2014, 8106 -8109.

AMA Style

Shih-Jung Wang, Jiun-Jie Jia, Kuei-Chiang Lai, Szu-Lin Su. A nonlinear equalization algorithm for single-carrier block transmission systems. 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). 2014; ():8106-8109.

Chicago/Turabian Style

Shih-Jung Wang; Jiun-Jie Jia; Kuei-Chiang Lai; Szu-Lin Su. 2014. "A nonlinear equalization algorithm for single-carrier block transmission systems." 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) , no. : 8106-8109.

Journal article
Published: 01 August 2013 in Journal of Hydrology
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ACS Style

Shih-Jung Wang; Kuo-Chin Hsu. Dynamic interactions of groundwater flow and soil deformation in randomly heterogeneous porous media. Journal of Hydrology 2013, 499, 50 -60.

AMA Style

Shih-Jung Wang, Kuo-Chin Hsu. Dynamic interactions of groundwater flow and soil deformation in randomly heterogeneous porous media. Journal of Hydrology. 2013; 499 ():50-60.

Chicago/Turabian Style

Shih-Jung Wang; Kuo-Chin Hsu. 2013. "Dynamic interactions of groundwater flow and soil deformation in randomly heterogeneous porous media." Journal of Hydrology 499, no. : 50-60.

Journal article
Published: 01 August 2013 in Journal of Geotechnical and Geoenvironmental Engineering
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A physics-based method is proposed for simultaneously obtaining the hydraulic conductivity, Young’s modulus, and Poisson’s ratio of soil materials using the uniaxial consolidation test. A nonlinear poroelastic model is presented, and the settlement data from consolidation tests are fitted to the model at each load step with the least-squares error method to inverse the parameters. The model results perfectly fit the experimental data in the initial load steps but slightly deviate from the data in later load steps as a result of secondary settlement and a largely increased Young’s modulus. The inversed parameters are compared with those calculated from the uniaxial consolidation test and those found in the literature. The comparison results demonstrate that the inversed parameters are reasonable. The proposed method provides both an estimation of parameters and the parameter-change information during a consolidation test. The method is simple, efficient, and versatile for obtaining poromechanical parameters with the uniaxial consolidation test. These parameters are useful for groundwater, geomechanical, and mining engineering.

ACS Style

Kuo-Chin Hsu; Shih-Jung Wang; Chein-Lee Wang. Estimating Poromechanical Properties Using a Nonlinear Poroelastic Model. Journal of Geotechnical and Geoenvironmental Engineering 2013, 139, 1396 -1401.

AMA Style

Kuo-Chin Hsu, Shih-Jung Wang, Chein-Lee Wang. Estimating Poromechanical Properties Using a Nonlinear Poroelastic Model. Journal of Geotechnical and Geoenvironmental Engineering. 2013; 139 (8):1396-1401.

Chicago/Turabian Style

Kuo-Chin Hsu; Shih-Jung Wang; Chein-Lee Wang. 2013. "Estimating Poromechanical Properties Using a Nonlinear Poroelastic Model." Journal of Geotechnical and Geoenvironmental Engineering 139, no. 8: 1396-1401.

Journal article
Published: 01 October 2012 in Applied Mechanics and Materials
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In this study, the grey system GM(1,1) and the geostatistical method are initially used to predict the land subsidence of the Yunlin area in the next five years. The Yunlin County Yuanchang Element School is taken as the site example when the stochastic poroelastic model is used in the study because there is a lack of data related to land subsidence. The verification results and prediction data of the stochastic poroelastic model and the grey system are displayed. The results show that the land subsidence in the next five years as calculated based on the data obtained from the monitoring wells is 0.3 m, while 0.31 m and 0.33 m are the prediction results from the stochastic poroelastic model and grey system model, respectively. This indicates the high precision of both models in predicting land subsidence. In order to simulate the effect of climate change on territorial planning, a prediction is made on the possible land subsidence for 2030, in this study. The prediction results are shows that by 25 January 2030, the stochastic poroelastic model shows a land subsidence of 1.01 m, while it is 1.68 m for the Grey System model. Because only the Changyuan Element School is taken as an observation station for the stochastic poroelastic model, the Grey System model is used to predict land subsidence for 2007 by the geostatistical method. The results show that land subsidence will mainly occur in the mid-western area of Yunlin and the western coastal area of Jianyi. To simulate the possible situations in the year 2030, four scene simulation models are proposed in this research, that is, adding 10% discharge, adding 20% discharge, subtracting 10% discharge, and subtracting 20% discharge. The results show the prediction on land subsidence for the year 2003 when add 10% discharge, subtract 10% discharge, add 20% discharge, and subtract 20% discharge, respectively. Land subsidence will occur mainly in the mid-western area of Yunlin and the western coastal area of Jiayi. The maximum land subsidence could reach up to 150 cm or so.

ACS Style

Kuan Wei Chen; C.H. Lee; Shih Jung Wang; Chien Hung Tu; Jung Wei Chen. Combination GM(1,1) and Stochastic Poroelastic Theory to Prediction the Land Subsidence in Yunlin and Jiayi Area, Taiwan. Applied Mechanics and Materials 2012, 204-208, 659 -663.

AMA Style

Kuan Wei Chen, C.H. Lee, Shih Jung Wang, Chien Hung Tu, Jung Wei Chen. Combination GM(1,1) and Stochastic Poroelastic Theory to Prediction the Land Subsidence in Yunlin and Jiayi Area, Taiwan. Applied Mechanics and Materials. 2012; 204-208 ():659-663.

Chicago/Turabian Style

Kuan Wei Chen; C.H. Lee; Shih Jung Wang; Chien Hung Tu; Jung Wei Chen. 2012. "Combination GM(1,1) and Stochastic Poroelastic Theory to Prediction the Land Subsidence in Yunlin and Jiayi Area, Taiwan." Applied Mechanics and Materials 204-208, no. : 659-663.

Journal article
Published: 04 September 2011 in African Journal of Business Management
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This research attempted to investigate the consumer perceptions on product quality, price, brand leadership and brand personality towards convenience goods and shopping goods based on international private labels (IPLs) and local private labels (LPLs). Data were collected outside the entrances of the main rail station of Taipei, Taiwan. A systematic sampling was adopted and 254 questionnaires were eventually collected. The findings revealed that the consumers in Taiwan believe that international and local hypermarkets both produce better convenience goods than shopping goods that have high quality and deliver more value. This research represents one of the few pioneer works that empirically investigate the aforementioned issues. Key words: International private label, local private label, convenience goods, shopping goods.

ACS Style

Jung Wang Shih; Shui Lien Chen Lily; Shih Jung Wang; Lily Shui-Lien Chen. Consumers attitudes towards different product category of private labels. African Journal of Business Management 2011, 5, 7616 -7621.

AMA Style

Jung Wang Shih, Shui Lien Chen Lily, Shih Jung Wang, Lily Shui-Lien Chen. Consumers attitudes towards different product category of private labels. African Journal of Business Management. 2011; 5 (17):7616-7621.

Chicago/Turabian Style

Jung Wang Shih; Shui Lien Chen Lily; Shih Jung Wang; Lily Shui-Lien Chen. 2011. "Consumers attitudes towards different product category of private labels." African Journal of Business Management 5, no. 17: 7616-7621.

Journal article
Published: 03 March 2011 in IEEE Journal of Solid-State Circuits
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The proposed single-inductor dual-output (SIDO) converter with interleaving energy-conservation mode (IECM) control is designed using 65 nm technology to power the ultra-wide band (UWB) system. The energy-conservation mode (ECM) control generates four different energy delivery paths for dual buck outputs with only one inductor. In addition, the superposition technique is used to achieve a minimized inductor current level. The average inductor current is equal to the summation of two output loads. Moreover, the IECM control activates the interleaving operation through the current interleaving mechanism to provide large driving capability as well as to reduce the output voltage ripple. As a result, 91% peak efficiency is derived and the output voltage ripple appears notably minimized by 50% using current interleaving at heavy load. The test chip occupies 1.44 mm2 in 65 nm CMOS and integrates with a three-dimensional (3-D) architecture for inductor integration.

ACS Style

Yu-Huei Lee; Yao-Yi Yang; Shih-Jung Wang; Ke-Horng Chen; Ying-Hsi Lin; Yi-Kuang Chen; Chen-Chih Huang. Interleaving Energy-Conservation Mode (IECM) Control in Single-Inductor Dual-Output (SIDO) Step-Down Converters With 91% Peak Efficiency. IEEE Journal of Solid-State Circuits 2011, 46, 904 -915.

AMA Style

Yu-Huei Lee, Yao-Yi Yang, Shih-Jung Wang, Ke-Horng Chen, Ying-Hsi Lin, Yi-Kuang Chen, Chen-Chih Huang. Interleaving Energy-Conservation Mode (IECM) Control in Single-Inductor Dual-Output (SIDO) Step-Down Converters With 91% Peak Efficiency. IEEE Journal of Solid-State Circuits. 2011; 46 (4):904-915.

Chicago/Turabian Style

Yu-Huei Lee; Yao-Yi Yang; Shih-Jung Wang; Ke-Horng Chen; Ying-Hsi Lin; Yi-Kuang Chen; Chen-Chih Huang. 2011. "Interleaving Energy-Conservation Mode (IECM) Control in Single-Inductor Dual-Output (SIDO) Step-Down Converters With 91% Peak Efficiency." IEEE Journal of Solid-State Circuits 46, no. 4: 904-915.

Journal article
Published: 21 October 2010 in IEEE Journal of Solid-State Circuits
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The proposed power management module with a typical 1.2 V low-voltage PWM (LV-PWM) controller and dynamic voltage scaling (DVS) function is designed using 65 nm technology for integration with the ultra-wide band (UWB) system. The on-chip pre-regulator with a power conditioning circuit can provide a regulated supply voltage to the LV-controller. Moreover, the proposed handover technique can achieve the self-biasing mechanism to further reduce power dissipation. To operate in low voltage, the proposed compensation enhancement multistage amplifier (CEMA) can achieve high loop gain and ensure system stability without using any external compensation component. The fabricated power management module occupies 0.356 mm2 silicon area with an excellent line/load transient response. Owing to the DVS function, the proposed power management can meet the power requirement in the UWB system and other RF transceiver systems.

ACS Style

Yu-Huei Lee; Yao-Yi Yang; Ke-Horng Chen; Ying-Hsi Lin; Shih-Jung Wang; Kuo-Lin Zheng; Po-Fung Chen; Chun-Yu Hsieh; Yu-Zhou Ke; Yi-Kuang Chen; Chen-Chih Huang. A DVS Embedded Power Management for High Efficiency Integrated SoC in UWB System. IEEE Journal of Solid-State Circuits 2010, 45, 1 .

AMA Style

Yu-Huei Lee, Yao-Yi Yang, Ke-Horng Chen, Ying-Hsi Lin, Shih-Jung Wang, Kuo-Lin Zheng, Po-Fung Chen, Chun-Yu Hsieh, Yu-Zhou Ke, Yi-Kuang Chen, Chen-Chih Huang. A DVS Embedded Power Management for High Efficiency Integrated SoC in UWB System. IEEE Journal of Solid-State Circuits. 2010; 45 (11):1.

Chicago/Turabian Style

Yu-Huei Lee; Yao-Yi Yang; Ke-Horng Chen; Ying-Hsi Lin; Shih-Jung Wang; Kuo-Lin Zheng; Po-Fung Chen; Chun-Yu Hsieh; Yu-Zhou Ke; Yi-Kuang Chen; Chen-Chih Huang. 2010. "A DVS Embedded Power Management for High Efficiency Integrated SoC in UWB System." IEEE Journal of Solid-State Circuits 45, no. 11: 1.

Proceedings article
Published: 01 June 2010 in 2010 Symposium on VLSI Circuits
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This interleaving energy-conservation mode control for single-inductor dual-output converter uses the superposition technique to yield the optimal average inductor current and 91% peak efficiency. Neither a freewheel stage nor a post-regulator is needed at nominal conditions. The output voltage ripple appears notably minimized over 50% by means of current interleaving at full load. The chip occupies 1.44 mm2 in 65 nm CMOS and integrates with a 3D architecture for ultra-wide band system.

ACS Style

Yu-Huei Lee; Ke-Horng Chen; Ying-Hsi Lin; Yao-Yi Yang; Shih-Jung Wang; Yi-Kuang Chen; Chen-Chih Huang. An interleaving energy-conservation mode (IECM) control in single-inductor dual-output (SIDO) step-down converters with 91% peak efficiency. 2010 Symposium on VLSI Circuits 2010, 57 -58.

AMA Style

Yu-Huei Lee, Ke-Horng Chen, Ying-Hsi Lin, Yao-Yi Yang, Shih-Jung Wang, Yi-Kuang Chen, Chen-Chih Huang. An interleaving energy-conservation mode (IECM) control in single-inductor dual-output (SIDO) step-down converters with 91% peak efficiency. 2010 Symposium on VLSI Circuits. 2010; ():57-58.

Chicago/Turabian Style

Yu-Huei Lee; Ke-Horng Chen; Ying-Hsi Lin; Yao-Yi Yang; Shih-Jung Wang; Yi-Kuang Chen; Chen-Chih Huang. 2010. "An interleaving energy-conservation mode (IECM) control in single-inductor dual-output (SIDO) step-down converters with 91% peak efficiency." 2010 Symposium on VLSI Circuits , no. : 57-58.