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Multi-agent systems for simulating spatial decision behaviors and land-use dynamics

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Science China Earth Sciences 2006年第11期49卷 1184-1194页

作者： Anthony Gar-On yeh Center of Urban Planning and Environmental Management The University of Hong Kong Hong Kong SAR China

A new method to simulate urban land-use dynamics is proposed based on multi-agent systems (MAS). The model consists of a series of environmental layers and multi-agent layers, which can interact with each other. It attempts to explore the interactions between different players or agents, such as residents, property developers, and governments, and between these players and the envi- ronment. These interactions can give rise to urban macro-spatial patterns. This model is used to simulate the land-use dynamics of the Haizhu district of Guangzhou City in 1995―2004. Cellular automata (CA) were also used for the simulation of land use changes as a comparison. The study indicates that MAS has better performance for simulating complex cities than CA.

关键词： multi-agent systems, cellular automata, complex systems, cities, land use.

输尿管良性狭窄内切开前行球囊扩张的临床研究

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中华外科杂志 2008年第9期46卷 685-687页

作者：张勇 TAN yeh hong 首都医科大学附属北京朝阳医院泌尿科 100020 Department of Urology Singapore General Hospital

目的探讨输尿管良性狭窄内切开前使用球囊扩张的必要性。方法16例输尿管良性狭窄患者行钬激光输尿管内切开前6例采用球囊扩张狭窄段，10例采用输尿管硬镜扩张狭窄段。回顾性分析其临床资料和随访结果，包括病因、狭窄部位、诊断方法和... 详细信息

目的探讨输尿管良性狭窄内切开前使用球囊扩张的必要性。方法16例输尿管良性狭窄患者行钬激光输尿管内切开前6例采用球囊扩张狭窄段，10例采用输尿管硬镜扩张狭窄段。回顾性分析其临床资料和随访结果，包括病因、狭窄部位、诊断方法和超声等。结果狭窄长度为0．8—1．4cm。输尿管硬镜扩张者3例失败，改用球囊扩张成功；使用球囊扩张的患者均扩张成功。用球囊扩张的手术时间短于用输尿管硬镜扩张，但手术费用高于用输尿管硬镜扩张，差异均有统计学意义（P〈0．05）。随访3—28个月，无围手术期并发症，2例用输尿管硬镜扩张患者出现再狭窄。结论输尿管良性狭窄内切开前使用球囊扩张安全、有效，再根据患者情况适当应用。

关键词：尿道狭窄气囊扩张术钬激光内切开

A concise review about fracture assessments of brittle solids with V-notches

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Frontiers of Structural and Civil Engineering 2019年第2期13卷 478-485页

作者： Hsien-Yang yeh Bin YANG Department of Mechanical and Aerospace Engineering California State UniversityLong BeachCA 90801USA Department of Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

A concise review of recent studies about the fracture assessments of elastic brittle solid materials containing V-notches is presented. In this preliminary and brief survey, elastic stress distributions in V-notched solids are discussed first. The concept of notch stress intensity factor is introduced. Combine the digital image correlation method with numerical computation techniques to analyze the stress distribution near the notches. Fracture criteria such as strain energy density, J-integral, theory of critical distance are used. However, various new materials are developed in different engineering fields, thus, the establishment of reliable and accurate material strength theory or failure criterion is imperative. Therefore, predicting fracture for various modem materials would require more experiments to infer material dependent parameters in the local fracture model.

关键词： fracture assessment brittle solids V-notches review

Innovative chest wall reconstruction with a locking plate and cement spacer after radical resection of chondrosarcoma in the sternum: A case report

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World Journal of Clinical Cases 2021年第10期9卷 2302-2311页

作者： Chung-Wei Lin Tsung-Yu Ho Chen-Wei yeh Hsien-Te Chen I-ping Chiang Yi-Chin Fong Department of Orthopedic Surgery China Medical University HospitalChina Medical UniversityTaichung City 40454Taiwan Department of Education China Medical University HospitalChina Medical UniversityTaichung City 40447Taiwan Department of Sports Medicine College of Health CareChina Medical UniversityTaichung City 40402Taiwan Spine Center China Medical University HospitalChina Medical UniversityTaichung City 40454Taiwan Department of Pathology China Medical University HospitalChina Medical UniversityTaichung 40454Taiwan Department of Orthopedic Surgery China Medical University Beigang HospitalYunlin County 65152Taiwan

BACKGROUND Chondrosarcoma,a cartilage matrix producing tumor,is the second most commonly observed primary bone tumor after osteosarcoma,accounting for 15%of all chest wall *** herein report the case of a patient with chondrosarcoma of the sternum and our management of the chest wall defects that presented following radical tumor *** SUMMARY A 31-year-old patient presented to our hospital with dull pain and a protruding mass overlying the chest for 3 *** presence of nocturnal pain and mass size progression was reported,as were overhead arm elevation-related *** tomography showed a focal osteoblastic mass in the sternum with bony exostosis and adjacent soft tissue *** emission tomography-computed tomography revealed hypermetabolic activity with a mass located over the upper *** resonance imaging showed a focal illdefined bony mass of the sternum with cortical destruction and periosteal *** biopsy showed a consistent result with chondrosarcoma with immunohistochemical positivity for S100 and focal positivity for *** grade II chondrosarcoma diagnosis was confirmed by postoperative *** patient underwent radical tumor resection and chest wall reconstruction with a locking plate and cement *** patient was discharged 1 wk after surgery without any *** the 1-year follow-up,there was no local recurrence on *** functional scores,including Constant Score,Nottingham Clavicle Score,and Oxford Shoulder Score,showed the absence of pain in the performance of daily activities or substantial functional *** The diagnosis of chondrosarcoma must be considered when chest wall tumors are *** surgical reconstructive materials,with a locking plate and cement spacer,used in our study are cost-effective and readily-available for the sternum defect.

关键词： Chondrosarcoma Sternum Chest wall Cement Reconstruction Case report

Microbial diversity of soil bacteria in agricultural field contaminated with heavy metals

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Journal of Environmental Sciences 2008年第3期20卷 359-363页

作者： CHIEN Chihching KUO Yumei CHEN Changchieh HUNG Chunwei yeh Chihwei yeh Weijen Graduate School of Biotechnology and Bioengineering Yuan Ze University Chung-Li Taiwan 320 China Department of Occupational Safety and Health Chung Hwa University of Medical Technology Tainan Taiwan China

In this study we evaluated the bacterial diversity in a soil sample from a site next to a chemical industrial factory previously contaminated with heavy metals. Analysis of 16S rDNA sequences amplified from DNA directly extracted from the soil revealed 17 different bacterial types （genera and/or species）. They included Polyangium spp., Sphingomonas spp., Variovorax spp., Hafina spp., Clostridia, Acidobacteria, the enterics and some uncultured strains. Microbes able to tolerate high concentrations of cadmium （500μmol/L and above） were also isolated from the soil. These isolates included strains of Acinetobacter （strain CD06）, Enterobacter sp. （strains CD01, CD03, CD04 and CD08）（similar strains also identified in culture-independent approach） and a strain of Stenotrophomonas sp. The results indicated that the species identified from direct analysis of 16S rDNA of the soil can be quite different from those strains obtained from enrichment cultures and the microbial activities for heavy metal resistance might be more appropriately addressed by the actual isolates.

关键词： cadmium heavy metal heavy metal resistant microbial diversity soil bacteria

Biomimetic flexible plate actuators are faster and more efficient with a passive attachment

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Acta Mechanica Sinica 2016年第6期32卷 1001-1011页

作者： Peter D.yeh Alexander Alexeev George W.Woodruff School of Mechanical Engineering Georgia Institute of Technology

Using three-dimensional computer simulations, we probe biomimetic free swimming of an internally actuated flexible plate in the regime near the first natural frequency. The plate is driven by an oscillating internal moment approximating the actuation mechanism of a piezoelectric macro fiber composite (MFC) bimorph. We show in our simulations that the addition of a passive attachment increases both swimming velocity and efficiency. Specifically, if the active and passive sections are of similar size, the overall performance is the best. We determine that this optimum is a result of two competing factors. If the passive section is too large, then the actuated portion is unable to generate substantial deflection to create sufficient thrust. On the other hand, a large actuated section leads to a bending pattern that is inefficient at generating thrust especially at higher frequencies.

关键词： Flexible plate Biomimetic Lattice Boltzmann Fluid-structure interaction Robotic fish Piezoelectric actuator

Risk factors and metabolic abnormality of patients with non-alcoholic fatty liver disease: Either non-obese or obese Chinese population

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Hepatobiliary & Pancreatic Diseases International 2018年第1期17卷 45-48页

作者： Shou-Wu Lee Teng-Yu Lee Sheng-Shun Yang Chun-Fang Tung hong-Zen yeh Chi-Sen Chang Division of Gastroenterology Department of Internal Medicine Taichung Veterans General Hospital

Background: Non-alcoholic fatty liver disease(NAFLD) occurs not only in obese individuals but also in non-obese ones. The aim of this study was to focus on the association between NAFLD and metabolic events in a non-obese or obese Chinese ***: Data collected from subjects registered at Taichung Veterans General Hospital from January to December 2009 were analyzed. The exclusion criteria were alcoholics, chronic hepatitis B or C. Patients included in analyses were assigned to four groups according to sonography of their liver(normal or NAFLD), and body mass index(BMI) levels(non-obese if BMI < 25 kg/m~2 or obese if BMI ≥ 25 kg/m~2).Results: There were 745, 208, 770 and 285 patients enrolled in four groups labeled non-obese normal liver(group A), non-obese NAFLD(group B), obese normal liver(group C) and obese NAFLD(group D),respectively. The highest ratio of metabolic syndrome existed in the group B(26.9%), followed by group A(11.7%), group D(10.9%) and finally the group C(5.2%). The positive association with NAFLD in non-obese individuals was significant in triglyceride(OR = 1.01; 95% CI: 1.01–1.02) and glucose(OR = 1.02; 95% CI:1.01–1.03), while the positive association with NAFLD in obese subjects was only significant in triglyceride(OR = 1.01; 95% CI: 1.01–1.02). The positive association was most significant in all cases(adjusted OR = 2.41; 95% CI: 1.78–3.24), especially in non-obese individuals(OR = 2.81; 95% CI: 1.92–4.12).Conclusions: Non-obese NAFLD subjects displayed a higher proportion of metabolic abnormality. Hyperlipidemia and hyperglycemia had the most positive strength association with NAFLD.

关键词： Fatty liver Non-alcoholic fatty liver disease Obese Chinese population

Porous Cube-like In_2O_3 Nanoparticles and Their Sensing Characteristics toward Ethanol

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Journal of Materials Science & Technology 2008年第4期24卷 667-674页

作者： Chih-Chia HUANG Chen-Sheng yeh Department of Chemistry National Cheng Kung University Tainan Taiwan Department of Chemistry Purdue University West Lafayette IN 47907 United States

Porous cube-like crystalline In2O3 nanoparticles with an average diagonal length of 34.8 nm were fabricated by a laser ablation-reflux process to form In（OH）3, followed by a calcination treatment to yield porous In2O3. HRTEM （high-resolution transmission electronic microscopy）, XRD （X-ray diffraction）, BET （Brunauer-Emmett-Teller）, and XPS （X-ray photoelectron spectroscopy） analysis were used to characterize their crystalline structures, grain sizes, surface areas, and surface compositions. The as-prepared porous in-dium oxides were tested for their sensing properties toward ethanol. Non-porous In2O3 nanopowder （about 40 nm） was also examined in order to compare the results with the as-prepared porous In2O3 nanomaterials. The porous In2O3 exhibited much better performance than that of non-porosus In2O3, and showed enhanced sensitivity with a lower detection limit than other reported In2O3-based materials when exposed to ethanol. Good gas sensitivity and linear behavior as a function of ethanol concentration were observed in the porous In2O3 nanoparticles.

关键词： In2O3 Porosity Nanoparticles Gas sensor

The association of non-alcoholic fatty liver disease and metabolic syndrome in a Chinese population

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Hepatobiliary & Pancreatic Diseases International 2017年第2期16卷 176-180页

作者： Shou-Wu Lee Teng-Yu Lee Sheng-Shun Yang Yen-Chun Peng hong-Zen yeh Chi-Sen Chang Division of Gastroenterology Department of Internal Medicine Taichung Veterans General Hospital Taichung Taiwan China

BACKGROUND： Non-alcoholic fatty liver disease（NAFLD） is associated with features of metabolic syndrome. The aim of this study was to investigate the association between NAFLD and metabolic syndrome in a Chinese population. METHODS： Data from subjects were retrospectively collected from 2006 to 2009. The exclusion criteria included significant consumption of alcohol and chronic hepatitis B and C. The patients were assigned to two groups according to ultrasound findings： normal group and fatty liver group. The liver function of patients was determined by assessing serum alanine aminotransferase（ALT）. Metabolic syndrome was diagnosed based on the 2005 International Diabetes Federation criteria. RESULTS： A total of 7568 subjects were enrolled and 5736（75.8%） and 1832（24.2%） patients were assigned to the normal and fatty liver groups, respectively. The fatty liver group had significant male predominance（69.7% vs 56.0%）, higher body mass index（mean, 26.67 vs 23.55 kg/m^2） compared with the normal group. There were 441（7.7%） and 377（20.6%） cases with metabolic syndrome in the normal and fatty liver groups, respectively, with significant difference（P=0.001）, and the subgroup of 385 cases with fatty liver and elevated ALT had higher prevalence（28.8%） of metabolic syndrome. The strongest association of an individual component of metabolic syndrome with NAFLD was hyperlipidemia（adjusted OR=2.55, 95% CI： 2.22-2.94）.CONCLUSION： The individuals with NAFLD had a higher ratio of metabolic syndrome. Hyperlipidemia had the strongest positive association with NAFLD.

关键词： fatty liver hyperlipidemia metabolic syndrome