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Novel supervised classification approach for multifrequency polarimetric SAR data

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Journal of Systems Engineering and Electronics 2015年第6期26卷 1216-1221页

作者： Biao You Bin Xu Jian Yang Chunmao yeh Jianshe Song Department of Electronic Engineering Tsinghua University Beijing Institute of Radio Measurement Xi'an Research Institute of Hi-Technology

A novel method is proposed for the supervised classification of multifrequency polarimetric synthetic aperture radar （PolSAR） images. The coherency matrices in P-, L-, and C-bands are mapped onto a 9×9 matrix Ω based on the eigenvalue decomposition of the coherency matrix of each band. A boxcar filter is then performed on the matrix Ω. The filtered data are put into a complex Wishart classifier. Finally, the effectiveness of the proposed method is demonstrated with JPL/AIRSAR multifrequency PolSAR data acquired over the Flevoland area.

关键词： synthetic aperture radar (SAR) polarimetry classifi-cation multifrequency.

Integration of Neural Networks and Cellular Automata for Urban Planning

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Geo-Spatial Information Science 2004年第1期7卷 6-13页

作者： Anthony Gar-on yeh Centre of Urban Planning and Environmental Management The University of Hong Kong

This paper presents a new type of cellular automa ta (CA) model for the simulation of alternative land development using neural netw orks for urban planning. CA models can be regarded as a planning tool because th ey can generate alternative urban growth. Alternative development patterns can b e formed by using different sets of parameter values in CA simulation. A critica l issue is how to define parameter values for realistic and idealized simulation . This paper demonstrates that neural networks can simplify CA models but genera te more plausible results. The simulation is based on a simple three-layer netw ork with an output neuron to generate conversion probability. No transition rule s are required for the simulation. Parameter values are automatically obtained f rom the training of network by using satellite remote sensing data. Original tra ining data can be assessed and modified according to planning objectives. Altern ative urban patterns can be easily formulated by using the modified training dat a sets rather than changing the model.

关键词： neural networks cellular automata GIS urban simulation urban planning

A high-fidelity design methodology using LES-based simulation and POD-based emulation:A case study of swirl injectors

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Chinese Journal of Aeronautics 2018年第9期31卷 1855-1869页

作者： Xingjian WANG Shiang-Ting yeh Yu-Hung CHANG Vigor YANG School of Aerospace Engineering Georgia Institute of Technology

Engineering design is undergoing a paradigm shift from design for performance to design for affordability, operability, and durability, seeking multi-objective optimization. To facilitate this transformation, significantly extended design freedom and knowledge must be available in the early design stages. This paper presents a high-fidelity framework for design and optimization of the liquid swirl injectors that are widely used in aerospace propulsion and power-generation systems. The framework assembles a set of techniques, including Design Of Experiment(DOE), high-fidelity Large Eddy Simulations(LES), machine learning, Proper Orthogonal Decomposition(POD)-based Kriging surrogate modeling(emulation), inverse problem optimization, and uncertainty quantification. LES-based simulations can reveal detailed spatiotemporal evolution of flow structures and flame dynamics in a high-fidelity manner, and identify important injector design parameters according to their effects on propellant mixing, flame stabilization, and thermal *** a given a space of design parameters, DOE determines the number of design points to perform LES-based simulations. POD-based emulations, trained by the LES database, can effectively explore the design space and deduce an optimal group of design parameters in a turn-around time that is reduced by three orders of magnitude. The accuracy of the emulated results is validated, and the uncertainty of prediction is quantified. The proposed design methodology is expected to profoundly extend the knowledge base and reduce the cost for initial design stages.

关键词： Emulation High-fidelity design Kriging Large Eddy Simulation(LES) Proper Orthogonal Decomposition(POD) Swirl injector

Mucosal patterns of Helicobacter pylori-related gastritis without atrophy in the gastric corpus using standard endoscopy

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World Journal of Gastroenterology 2010年第4期16卷 496-500页

作者： Shwu-Tzy Wu Chien-Hua Chen yeh-Huang Hung Tsung-Hsun Yang Vun-Siew Pang Yung-Hsiang yeh Department and Graduate Program of Bioindustrial Technology Dayeh UniversityChanghua County 51591TaiwanChina Division of Gastroenterology Department of Internal MedicineShow-Chwan Memorial HospitalChanghuaCity 500TaiwanChina Division of Gastroenterology Department of Internal MedicineChang Bing Show-Chwan Memorial HospitalChanghua County 505TaiwanChina

AIM:To identify the mucosal patterns of Helicobacter pylori(*** )-related gastritis in the gastric corpus using standard endoscopy and to evaluate their ***:A total of 112 consecutive patients underwent upper gastrointestinal *** endoscopists classified the endoscopic findings into 4 *** the second part of the study,90 images were shown to 3 endoscopists in order to evaluate the inter-observer and intra-observer variability in image ***:The mucosal patterns of the gastric bodywere categorized into 4 *** 1 pattern was defined as cleft-like appearance,type 2 as regular arrangement of red dots,type 3 pattern as the mosaic mucosal pattern and type 4 pattern as the mosaic pattern with a focal area of *** 1 and type 2 mucosal patterns were statistically significant in predicting *** status as compared with other mucosal types(χ 2 = 12.79 and 61.25 respectively,P < 0.01).Type 3 and type 4 mucosal patterns were statistically significant in predicting a ***-positive status as compared with other mucosal types(χ 2 = 21.22 and 11.02 respectively,P < 0.01).Furthermore,the sensitivity,specificity,positive and negative predictive values of type 3 plus type 4 patterns for predicting ***-positive gastric mucosa were 100%,86%,94%,and 100%,*** mean κ values for inter-and intra-observer agreement in assessing the various endoscopic patterns were 0.808(95% CI,0.678-0.938) and 0.826(95% CI,0.727-0.925) ***:Our study suggests that mucosal patterns in ***-infected gastric mucosa without atrophy can be reliably identified using standard endoscopy in the gastric corpus.

关键词： Gastric mucosa Helicobacter pylori Gastritis Digestive system diagnostic techniques Endoscopy

An Event Alarm System Based on Single and Group Human Behavior Analysis

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Journal of Electronic Science and Technology 2017年第2期15卷 123-132页

作者： Hung-Yu yeh I-Cheng Chang Yung-Hsin Chen Department of Computer Science&Information Engineering National Dong Hwa UniversityHualien 97401 cal-comp electronics and Communications Company Ltd. Taipei 10571

Due to the increasing demand for security, the development of intelligent surveillance systems has attracted considerable attention in recent years. This study aims to develop a system that is able to identify whether or not the people need help in a public place. Different from previous work, our work considers not only the behaviors of the target person but also the interaction between him and nearby people. In the paper, we propose an event alarm system which can detect the human behaviors and recognize the happening event through integrating the results generated from the single and group behavior analysis. Several new effective features are proposed in the study. Besides, a mechanism capable of extracting one-to-one and multiple-to-one relations is also developed. Experimental results show that the proposed approach can correctly detect human behaviors and provide the alarm messages when emergency events occur.

关键词： Index Terms Event alarm system group behavior analysis human behavior recognition single behavior analysis stooping curve.

Effect of transcutaneous electrical nerve stimulation through acupoints of Pucan (BL 61) and Shenmai (BL 62) on intraocular pressure in patients with glaucoma： a randomized controlled trial

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Journal of Traditional Chinese Medicine 2016年第1期36卷 51-56页

作者： yeh Tsui-Yun Lin Jen-Chien Liu Chi-Feng Graduate Institute of Integration of Traditional Chinese Medicine with Western Nursing National Taipei University of Nursing and Health Sciences Taipei City Hospital Taipei 10065 China Department of Ophthalmology Taipei CityHospitaI Taipei 10065 China

OBJECTIVE： To investigate the effects of transcutaneous electrical nerve stimulation （TENS） through acupoints on the intraocular pressure （lOP） in patients with glaucoma. METHODS： A single-blinded, randomized experimental design study was conducted. Patients from the North of Taipei Ophthalmology outpatient department diagnosed with intraocular hypertension were selected and were further enrolled if they met the research subject criteria. The patients who met all criteria, and who met no exclusion criteria became the participants. Participants were randomly assigned into the treated group, wherein the TENS electrodes （Qing Ming Medical Device Co., Ltd., New Taipei City, China） were applied with direct current （DC） on the acupoints Pucan （BL 61） and Shenmai （BL 62） for 20 min. The control group received no TENS electrode treatments. Measurements of lOP were taken four times using a pneumotonometer （Clinico Co., Ltd., New Taipei City, China）, before, immediately after, 30 min after, and 60 min after TENS electrode treatments. RESULTS： Eighty-two participants completed the experiment, lOP decreased more in the group treated with DC （P 〈 0.01） than in the control *** lOPs were not affected by the age of the patients and their usage of medications. CONCLUSION： TENS of acupoints of Pucan （BL 61） and Shenmai （BL 62） could significantly reduce the lOP in patients with glaucoma.

关键词： Glaucoma Intraocular pressure Ocularhypertension Acupuncture points Transcutaneous electrical nerve stimulation Randomized con-trolled trial

Windowing Techniques, the Welch Method for Improvement of Power Spectrum Estimation

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Computers, Materials & Continua 2021年第6期67卷 3983-4003页

作者： Dah-Jing Jwo Wei-yeh Chang I-Hua Wu Department of Communications Navigation and Control EngineeringTaiwan Ocean UniversityKeelung202-24TaiwanChina Innovative Navigation Technology Ltd. Kaohsiung801TaiwanChina

This paper revisits the characteristics of windowing techniques with various window functions involved,and successively investigates spectral leakage mitigation utilizing the Welch *** discrete Fourier transform(DFT)is ubiquitous in digital signal processing(DSP)for the spectrum analysis and can be efciently realized by the fast Fourier transform(FFT).The sampling signal will result in distortion and thus may cause unpredictable spectral leakage in discrete spectrum when the DFT is *** is implemented by multiplying the input signal with a window function and windowing amplitude modulates the input signal so that the spectral leakage is evened ***,windowing processing reduces the amplitude of the samples at the beginning and end of the *** addition to selecting appropriate window functions,a pretreatment method,such as the Welch method,is effective to mitigate the spectral *** to the noise caused by imperfect,nite data,the noise reduction from Welch’s method is a desired *** nonparametric Welch method is an improvement on the periodogram spectrum estimation method where the signal-to-noise ratio(SNR)is high and mitigates noise in the estimated power spectra in exchange for frequency resolution *** periodogram technique based on Welch method is capable of providing good resolution if data length samples are appropriately *** design of nite impulse response(FIR)digital lter using the window technique is rstly *** inuence of various window functions on the Fourier transform spectrum of the signals is *** on spectral resolution based on the traditional power spectrum estimation and various window-function-based Welch power spectrum estimations is presented.

关键词： Window functions Welch method discrete Fourier transform spectral leakage

Analysis and design of a smart card based authentication protocol

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第12期14卷 909-917页

作者： Kuo-Hui yeh Kuo-Yu TSAI Jia-Li HOU Department of Information Management National Dong Hwa University Department of Management Information Systems Hwa Hsia Institute of Technology

Numerous smart card based authentication protocols have been proposed to provide strong system security and robust individual privacy for communication between parties these days. Nevertheless, most of them do not provide formal analysis proof, and the security robustness is doubtful. Chang and Cheng(2011) proposed an efficient remote authentication protocol with smart cards and claimed that their proposed protocol could support secure communication in a multi-server environment. Unfortunately, there are opportunities for security enhancement in current schemes. In this paper, we identify the major weakness, i.e., session key disclosure, of a recently published protocol. We consequently propose a novel authentication scheme for a multi-server environment and give formal analysis proofs for security guarantees.

关键词： Authentication Privacy Security Smart card

Hepatocellular carcinoma in patients with renal dysfunction: Pathophysiology, prognosis, and treatment challenges

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World Journal of Gastroenterology 2021年第26期27卷 4104-4142页

作者： Hsuan yeh Chung-Cheng Chiang Tzung-Hai Yen Department of Nephrology Chang Gung Memorial Hospital and Chang Gung UniversityTaipei 105Taiwan Department of Gastroenterology and Hepatology Chang Gung Memorial HospitalTaoyuan 333Taiwan

The population of patients with hepatocellular carcinoma(HCC)overlaps to a high degree with those for chronic kidney disease(CKD)and end-stage renal disease(ESRD).The degrees of renal dysfunction vary,from the various stages of CKD to dialysis-dependent ESRD,which often affects the prognosis and treatment choice of patients with *** addition,renal dysfunction makes treatment more difficult and may negatively affect treatment *** study summarized the possible causes of the high comorbidity of HCC and renal *** possible mechanisms of CKD causing HCC involve uremia itself,long-term dialysis status,immunosuppressive agents for postrenal transplant status,and miscellaneous factors such as hormone alterations and *** possible mechanisms of HCC affecting renal function include direct tumor invasion and hepatorenal ***,we categorized the risk factors that could lead to both HCC and CKD into four categories:Environmental toxins,viral hepatitis,metabolic syndrome,and vasoactive *** CKD and ESRD have been reported to negatively affect HCC prognosis,but more research is warranted to confirm ***,ESRD status itself ought not to prevent patients receiving aggressive *** study then adopted the well-known Barcelona Clinic Liver Cancer guidelines as a framework to discuss the indicators for each stage of HCC treatment,treatment-related adverse renal effects,and concerns that are specific to patients with pre-existing renal dysfunction when undergoing aggressive treatments against CKD and *** aggressive treatments include liver resection,simultaneous liver kidney transplantation,radiofrequency ablation,and transarterial ***,focusing on patients unable to receive active treatment,this study compiled information on the latest systemic pharmacological therapies,including targeted and immunotherapeutic *** on available clinical studies and Food and Drug Administration labe

关键词： Hepatocellular carcinoma Chronic kidney disease End-stage renal disease Hemodialysis Cancer prognosis Cancer therapeutics