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Examining the nonlinear and threshold effects of the 5Ds built environment to land values using interpretable machine learning models

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Journal of Geographical Sciences 2024年第12期34卷 2509-2533页

作者： Quang Cuong DOAN Khac Hung VU thi kieu trang trinh thi Cam Ngoc BUI Department of Urban Planning and Design The University of Hong KongHong KongChina Department of Land Management VNU University of ScienceHanoiVietnam Vietnam National University HanoiVietnam Faculty of Land Administration Hanoi University of Natural Resources and EnvironmentHanoiVietnam

Previous studies have extensively explored the critical influence of the built environment on land values,but the non-linear relationship has yet to be fully *** study aims to uncover the non-linear relationship between land values and the five built environment dimensions using machine learning algorithms and Shapley Additive ex Planation(SHAP).The results highlight that the Gradient Boost Decision Tree (GBDT) outperforms e Xtreme Gradient Boosting (XGBoost),Ordinary Least Squares (OLS),and Multiscale Geographically Weighted Regression (MGWR) in land value estimation,exhibiting higher R^(2) and lower Root Mean Square Error (RMSE) and Mean Absolute Error (MAE).The results illustrate that density and destination accessibility are the dominant factors,contributing 32.48%and37.38%to land value variation,*** observed that the top three factors affecting land values are the built-floor area ratio,the number of floors and the number of ***,the results revealed the non-linear relationship between the built environment and land values,suggesting that maintaining built environment features at optimal thresholds may increase land *** interaction effects may lead to bias in determining relationships between land values and the built *** study contributes to the literature by providing non-linear and threshold identification evidence in land value determinants,offering valuable insights for urban planners and real estate managers.

关键词： built environment land values housing price GBDT SHAP non-linear relationships machine learning

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A comparative analysis of weight-based machine learning methods for landslide susceptibility mapping in Ha Giang area

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Big Earth Data 2023年第4期7卷 1005-1034页

作者： Thanh trinh Binh Thanh Luu trang Ha thi Le Duong Huy Nguyen Trong Van Tran thi Hai Van Nguyen Khanh Quoc Nguyen Lien thi Nguyen Faculty of Computer Science Phenikaa UniversityYen NghiaHa DongHanoi 12116Vietnam Phenikaa Research and Technology Institute(PRATI) A&A Green Phoenix Group JSCNo.167 Hoang NganTrung HoaCau GiayHanoi 11313Vietnam Northwestern Geological Division General Department of Geology and Minerals of VietnamHanoiVietnam Youth union office Thuyloi University175 Tay SonDong DaHanoiVietnam Center of Remote Sensing and Geohazards Vietnam Institute of Geosciences and Mineral ResourcesHanoiVietnam

Landslide susceptibility maps (LSMs) are very crucial for planningpolicies in hazardous areas. However, the accuracy and reliability ofLSMs depend on available data and the selection of suitable *** study is conducted to produce LSMs by combinations of machinelearning methods and weighting techniques for Ha Giang province,Vietnam, where has limited data. In study area, we gather 11 landslideconditioning factors and establish a landslide inventory *** the weights of classes (or factors) is very important toprepare data for machine learning methods to generate LSMs. Wefrst use frequency ratio (FR) and analytic hierarchy process (AHP)techniques to generate the weights. Then, random forest (RF), supportvector machine (SVM), logistic regression (LR), and AHP methods arecombined with FR and AHP weights to yield accurate and reliableLSMs. Finally, the performance of these methods is evaluated by fivestatistical metrics, ROC and R-index. The empirical results have shownthat RF is the best method in terms of R-index and the five metrics, *** rate (0.9661), FP rate (0.0), ACC (0.9835), MAE (0.0046), and RMSE(0.0350) for this study area. this study opens the perspective of weightbasedmachine learning methods for landslide susceptibility mapping.

关键词： Landslide logistic regression random forest SvM Vietnam

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Compensation of Zn substitution and secondary phase controls effective mass and weighted mobility in In and Ga co-doped ZnO material

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Journal of Materiomics 2021年第4期7卷 742-755页

作者： Oanh kieu Truong Le Anh Tuan Thanh Pham Ngoc Kim Pham trang Huyen Cao Pham Truong Huu Nguyen Dung Van Hoang Hanh kieu thi Ta Dai Cao Truong Hoa thi Lai Thuy Dieu thi Ung Vinh Cao Tran Thang Bach Phan aboratory of Advanced Materials University of ScienceHoChiMinh City700000Viet Nam Vietnam National University HoChiMinh City700000Viet Nam Faculty of Physics and Engineering Physics University of ScienceHoChiMinh City700000Viet Nam Faculty of Materials Science and Technology University of ScienceHoChiMinh City700000Viet Nam Center for Innovative Materials and Architectures(INOMAR) HoChiMinh CityViet Nam Institute of Materials Science Vietnam Academy of Science and TechnologyHanoi100000Viet Nam

Conductivity s and thermal conductivity k are directly related to carrier concentration while Seebeck coefficient S is inversely proportional to carrier ***,improving thermoelectric(TE)performance is ***,the first-time analysis of secondary phase-controlled TE performance in terms of density-of-state effective mass m*d,weighted mobility mw and quality factor B is discussed in ZnO *** results show that the secondary spinel phase Ga2O_(3)(ZnO)9 not only impacts on k but also on s and S at high temperature,while the effect of carrier concentration seem to be dominant at low *** the high-spinel-segregation sample,a compensation of dopant atoms from the spinel to substitutional sites in the ZnO matrix at high temperature leads to a low decreased rate of temperaturedependent m**** compensation process also induces a band sharpening,a small mw reduction,and a large B *** a result,In and Ga co-doped ZnO bulk with the highest spinel segregation achieves the greatest PF improvement by 112.8%,owing to enhanced Seebeck coefficient by 110%as compared to the good Zn-substitution sample.

关键词： Thermoelectrics In and Ga co-Doped ZnO Secondary phase Zn substitution DOS effective Mass Weighted mobility

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越南鸟栈国家公园赤颈鹤（Grus antigone sharpii）种群增长模型及景观特征分析

越南鸟栈国家公园赤颈鹤（Grus antigone sharpii）种群增长模型...

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作者： NGO thi kieu trang 东北林业大学

学位级别：硕士

越南鸟栈国家公园是赤颈鹤东方亚种(Grus antigone sharpii)在越南区域的主要分布地,也是越南赤颈鹤种群重引入前的野化地。但该区域的赤颈鹤种群自1986年被发现后整体呈下降趋势,很不乐观。为了探究鸟栈公园赤颈鹤种群下降原因,本研究... 详细信息

越南鸟栈国家公园是赤颈鹤东方亚种(Grus antigone sharpii)在越南区域的主要分布地,也是越南赤颈鹤种群重引入前的野化地。但该区域的赤颈鹤种群自1986年被发现后整体呈下降趋势,很不乐观。为了探究鸟栈公园赤颈鹤种群下降原因,本研究从种群内在增长和外在景观环境两方面着手,利用逻辑斯蒂方程、马尔萨斯方程、周限增长率分别拟合了世代重叠种群有限环境中、世代重叠种群无限环境中、世代不重叠种群无限环境中赤颈鹤种群增长模型,并进而利用ENVI 5.3、Arc GIS 10.5软件和1988-2022年Landsat遥感影像从土地利用类型和景观特征水平分析了其对赤颈鹤种群增长的环境阻力。结果表明:(1)赤颈鹤种群大小在1988-2022年间呈种群衰退状态,直至数量为零。(2)用三种方法拟合了赤颈鹤种群增长模型。世代重叠前提下,在有限环境中,逻辑斯蒂方程显示出赤颈鹤种群拟合曲线总体较平缓,与观察种群曲线不重叠,在2000年,两曲线发生交叉。世代重叠前提下,在无限环境中,马尔萨斯方程显示出赤颈鹤种群拟合曲线与观察种群曲线在1988-2000年具有一定的同步性,但其波动不如观察种群明显;在2000年后,拟合种群曲线稳定,拟合种群大小显著高于观察种群大小。世代不重叠前提下,在无限环境中,赤颈鹤种群周限增长率平均值为0.89,拟合种群曲线中,1992年和1996年观察种群数量明显偏离拟合种群数量,其余年份间观察种群数量均围绕着拟合种群曲线波动,总体呈现出一定的同步性。(3)鸟栈公园植物群落包括白千层、莲花、铺地黍-野生稻、荸荠属草、混合植物、水道(特指人工水渠)和水域(属于季节性地表积水);其中,铺地黍-野生稻和白千层是优势植物群落,白千层植物群落面积与赤颈鹤种群数量呈显著负相关;而荸荠属草植物群落面积波动较大,与赤颈鹤种群数量呈显著正相关。(4)斑块类型水平和景观水平均影响赤颈鹤种群。其中,斑块类型水平上,赤颈鹤种群数量与荸荠属草面积、莲花的周长面积分维数以及混合植物的最大斑块指数呈显著或极显著正相关;与白千层面积及铺地黍-野生稻的散布与并列指数呈显著或极显著负相关。景观水平上,赤颈鹤种群数量只与周长面积分维数呈显著正相关。进一步分析表明,1988-2000年间,赤颈鹤观察种群在鸟栈公园受到环境资源有限性的阻力,并且环境阻力存在时滞效应;环境中的荸荠属草植物群落显著下降和白千层植物群落面积显著增加对赤颈鹤种群下降有影响。基于此,建议越南鸟栈国家公园根据需要对荸荠属草植物群落和白千层植物群落进行适当管理。

关键词：种群增长模型土地利用类型景观特征赤颈鹤东方亚种越南鸟栈国家公园

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Brunner’s gland hyperplasia associated with lipomatous pseudohypertrophy of the pancreas presenting with gastrointestinal bleeding:A case report

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World Journal of Clinical Cases 2021年第31期9卷 9670-9679页

作者： Long Cong Nguyen Khanh Truong Vu trang thi Thuy Vo Chau Ha trinh Tan Dang Do Ngoc thi Van Pham Tuyen Van Pham Thanh Tuan Nguyen Hiep Canh Nguyen Jeong-Sik Byeon Gastroenterology and Hepatology Center Bach Mai HospitalHanoi 10000Viet Nam Department of Gastroenterology School of Medicine and PharmacyVietnam National University HanoiHanoi 10000Viet Nam Radiology Center Bach Mai HospitalHanoi 10000Viet Nam Pathology Center Bach Mai HospitalHanoi 10000Viet Nam Department of Human Pathology Kanazawa University Graduate School of MedicineKanazawa 920-8640Japan Department of Gastroenterology Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea

BACKGROUND Brunner’s gland hyperplasia(BGH)is a rare benign lesion of the *** pseudohypertrophy(LiPH)of the pancreas is an extremely rare *** each condition is rare,the probability of purely coincidental coexistence of both conditions is extremely *** SUMMARY We report a 26-year-old man presenting to our hospital with symptoms of recurrent upper gastrointestinal *** gastrointestinal endoscopy showed a huge pedunculated polypoid lesion in the duodenum with bleeding at the base of the *** examination of the duodenal biopsy specimens showed ***,abdominal computed tomography and magnetic resonance imaging revealed marked fat replacement over the entire pancreas,confirmed by histopathological evaluation on percutaneous pancreatic *** on the radiological and histological findings,LiPH of the pancreas and BGH were *** patient refused any surgical ***,he was managed with supportive *** patient’s symptoms improved and there was no further *** this is the first well-documented case showing the coexistence of LiPH of the pancreas and BGH.

关键词： Lipomatous pseudohypertrophy Pancreas Gastrointestinal bleeding Brunner’s gland Case report

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不同天气条件下青头潜鸭越冬期行为的响应模式

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应用生态学报 2022年第9期33卷 2557-2562页

作者：李浙张琦吴庆明高晓冬 Ngo thi kieu trang 徐卓东北林业大学野生动物与自然保护地学院哈尔滨150040 曲阜师范大学生命科学学院山东曲阜273165 黑龙江扎龙国家级自然保护区管理局黑龙江齐齐哈尔161000

2018年11—12月在河南民权国家湿地公园,采用定点观察法、扫描取样法对越冬青头潜鸭在不同天气条件下的行为响应模式进行研究。结果表明:在晴天,静息、飞行、运动是青头潜鸭越冬期的优势行为(65.5%),觅食、修整是次要行为(31.9%);行为... 详细信息

2018年11—12月在河南民权国家湿地公园,采用定点观察法、扫描取样法对越冬青头潜鸭在不同天气条件下的行为响应模式进行研究。结果表明:在晴天,静息、飞行、运动是青头潜鸭越冬期的优势行为(65.5%),觅食、修整是次要行为(31.9%);行为节律表现为上午觅食、中午静息、下午觅食修整;飞行通常发生在觅食高峰前,运动行为多与其他行为相伴,其时间分配与觅食呈正响应,与静息呈负响应。相较于晴天,阴雨天青头潜鸭增加了对静息和觅食的时间分配,静息、觅食和运动为阴雨天的主要行为(76.5%),修整、飞行为次要行为(20.3%);觅食和静息的高峰时段后移,傍晚时达到高峰,飞行和修整时间显著减少。与晴天相比,雾霭天青头潜鸭静息、觅食、运动和修整的时间分配增加,飞行行为减少;觅食高峰后移至中午和下午,静息高峰后移至下午;静息、运动和觅食为雾霭天的优势行为(70.6%),修整和飞行为次要行为(27.5%)。研究表明,不同天气条件下,民权湿地公园青头潜鸭的越冬期行为在时间分配、行为节律、优势行为方面存在一定的响应;阴雨天和雾霭天青头潜鸭会分配更多的静息和觅食时间,并通过增加能量摄入和减少耗能行为应对恶劣天气。

关键词：优势行为行为节律行为时间分配天气条件青头潜鸭民权湿地公园

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哈尔滨兆麟公园繁殖期鸳鸯日行为模式比较研究

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野生动物学报 2023年第4期44卷 842-852页

作者： NGO thi kieu trang 杨雨尘李浙田一柳王佳明吕泓学邓文攸石娟吴庆明东北林业大学野生动物与自然保护地学院哈尔滨150040 黑龙江凉水国家级自然保护区管理局伊春153106

2021年4—7月,在哈尔滨兆麟公园采用定点观察法、瞬时扫描法对繁殖期鸳鸯(Aix galericulata)日行为模式的时间分配和节律在不同性别、不同阶段、成幼间的差异进行研究,主要观察记录静栖、站立、游走、理羽、觅食、警戒、打斗和飞行等行... 详细信息

2021年4—7月,在哈尔滨兆麟公园采用定点观察法、瞬时扫描法对繁殖期鸳鸯(Aix galericulata)日行为模式的时间分配和节律在不同性别、不同阶段、成幼间的差异进行研究,主要观察记录静栖、站立、游走、理羽、觅食、警戒、打斗和飞行等行为,累积观察726 h,共获得173246条有效数据。结果表明:(1)在日行为时间分配上,不同性别、不同阶段(卵期和雏期)及成幼间存在显著差异(p<0.05)。静栖是卵期、雏期成年雌雄个体的优势行为,雄性站立和打斗行为显著高于雌性,雌性觅食行为显著高于雄性。卵期游走、觅食行为显著高于雏期,雏期站立、理羽行为显著高于卵期。成幼优势行为存在显著差异,静栖为成体的主要行为,而幼体为游走和觅食;成体用于静栖、站立和理羽的时间显著高于幼体,而幼体用于游走、觅食的时间显著高于成体。(2)在行为活动节律上,不同性别、不同阶段及成幼间表现的方式不同。不同性别、不同阶段(卵期和雏期)主要行为节律趋于一致,均表现为早、午和晚3个觅食峰值,觅食中或觅食后会有站立、理羽、警戒和游走行为,晨食后有明显的静栖高峰,雌性个体下午出现静栖小峰值,期间伴有游走和飞行行为,雄性打斗行为偏多,卵期打斗行为波动较大,并与雏期呈互补的螺旋结构。成幼间行为节律存在显著差异,觅食、静栖、站立、理羽和游走行为全时段基本均有发生,幼体除觅食外均有1个明显峰值,但成体活动的峰值不明显(觅食除外)。基于分析结果,建议兆麟公园在鸳鸯卵期和雏期要视性别、成幼给与不同的管理方式。

关键词：鸳鸯性别差异阶段差异成幼差异日行为模式

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河南民权湿地公园青头潜鸭越冬栖息地适宜性评价

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东北师大学报（自然科学版） 2023年第3期55卷 109-113页

作者：孙雪莹张琦吴庆明徐卓邓文攸 NGO thi kieu trang 徐炯安凯滨东北林业大学野生动物与自然保护地学院黑龙江哈尔滨150040 黑龙江扎龙国家级自然保护区管理局黑龙江齐齐哈尔161000

为了累积青头潜鸭栖息地适宜性方面的保护生物学信息,并为后续的迁地保护饲养繁育提供野外理论基础,基于最大熵(Maxent)模型,对河南民权黄河故道国家湿地公园青头潜鸭的越冬栖息地适宜性进行了分析与评价.结果表明:民权湿地公园内青头... 详细信息

为了累积青头潜鸭栖息地适宜性方面的保护生物学信息,并为后续的迁地保护饲养繁育提供野外理论基础,基于最大熵(Maxent)模型,对河南民权黄河故道国家湿地公园青头潜鸭的越冬栖息地适宜性进行了分析与评价.结果表明:民权湿地公园内青头潜鸭适宜的越冬栖息地面积较小,仅占该区域总面积的4.66%,多集中于废弃鱼、藕塘等隐蔽性较好、食物较充足的小生境水域.应通过合理设置禁渔期、设立禁渔区、减少或杜绝人为干扰等,加强对该区域青头潜鸭的保护管理工作.

关键词：栖息地适宜性越冬期潜在分布区青头潜鸭民权湿地公园

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High burden of hepatocellular carcinoma and viral hepatitis in Southern and Central Vietnam:Experience of a large tertiary referral center,2010 to 2016

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World Journal of Hepatology 2018年第1期10卷 116-123页

作者： Song-Huy Nguyen-Dinh Albert Do trang Ngoc Doan Pham Doan Y Dao trinh Nhu Nguy Moon S Chen Jr Liver Tumor DepartmentCho Ray HospitalHo Chi Minh City 700000Vietnam Department of Internal Medicine Yale UniversityNew HavenCT 06510United States School of Public Health University of IllinoisChicagoIL 60302United States Division of Digestive and Liver Diseases UT Southwestern Medical CenterDallasTX 75390United States Vietnam Viral Hepatitis Alliance Ho Chi Minh City 7000Vietnam Davis Comprehensive Cancer Center University of CaliforniaSacramentoCA 95817United States

AIM To examine the largest tertiary referral center in southern and central Vietnam from 2010 to 2016, evaluating epidemiological trends of hepatocellular carcinoma(HCC) and viral hepatitis B-C in this resource-limited *** We extracted data of patients receiving care from Cho Ray Hospital(Ho Chi Minh City), the largest oncology referral center in southern and central Vietnam, from 2010 to 2016. We collected information on patient age, gender, geographic distribution, and disease characteristics including disease stage, tumor biomarker levels [serum alpha-fetoprotein(AFP), AFP-L3 isoform percentage, and prothrombin induced by induced by vitamin K absence-Ⅱ], and serological testing for hepatitis B virus(HBV) and hepatitis C virus(HCV) *** Data from 24091 HCC patients were extracted, with sample demographics comprising mostly male(81.8%) and older age(however with 8.5% younger than 40 years old). this patient sample included a geographic catchment population of 56 million people(60% of the country's total population of 92.7 million), derived from 38 provinces and municipalities in Vietnam. Chronic HBV infection was found in 62.3% of cases, and chronic HCV infection in 26.0%. HBV and HCV co-infection was seen in 2.7%. Cirrhosis was found in an estimated 30% to 40% of cases. Nine percent of patients were not found to have chronic viral hepatitis. Twenty three point two percent of the patients had a normal AFP level. A total of 2199 patients were tested with AFP-L3 and PIVKA Ⅱ over two years, with 57.7% having elevated AFP-L3%, and 88.5% with elevated PIVKA Ⅱ levels. Over this 7-year period, the incidence of HCC increased, with a large proportion of cases(overall 40.8%) presenting initially an advanced stage, not amendable to surgical or locoregional *** HCC contributes significant health care burden in southern and central Vietnam, with increasing case volume over this seven-year period. Viral hepatitis likely explains this high

关键词： Hepatocellular carcinoma Hepatitis B virus Hepatitis C virus Alpha-fetoprotein

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Positron Annihilation in Perfect and Defective TiO<sub>2</sub>Rutile Crystal with Single Particle Wave Function: Slater Type Orbital and Modified Jastrow Functions

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World Journal of Nuclear Science and Technology 2014年第1期4卷 33-39页

作者： trinh Hoa Lang Chau Van Tao kieu Tien Dung Le Hoang Chien Faculty of Physics and Engineering Physics University of Science Ho Chi Minh City Vietnam Swinburne University of Technology Melbourne Australia

Positron annihilation in TiO2 rutile crystal is studied by an assumption that a positron binds with valance electrons of a titanium dioxide to form a pseudo TiO2-positron molecule before it annihilates with these electrons. The orbital modification consisting of explicit electron-positron and electron-electron correlation in each electronic orbital is used for the electrons and positron wave functions. By these wave functions, the calculation results of the positron lifetimes in unmitigated and defective TiO2 crystals are about 170 ps, 266 ps and 243 ps, respectively. These results are in good agreement with experimental data of the positron lifetimes in vacancies of TiO2 from 180 ps to 300 ps.

关键词： Positron Annihilation Jastrow Lifetime VQMC TiO2

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