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| 1 | Missing Data Imputation for Traffic Flow Based on Improved Local Least Squares显示文摘Complete and reliable field traffic data is vital for the planning, design, and operation of urban traffic management systems. However, traffic data is often very incomplete in many traffic information systems, which hinders effective use of the data. Methods are needed for imputing missing traffic data to minimize the effect of incomplete data on the utilization. This paper presents an improved Local Least Squares (LLS) approach to impute the incomplete data. The LLS is an improved version of the K Nearest Neighbor (KNN) method. First, the missing traffic data is replaced by a row average of the known values. Then, the vector angle and Euclidean distance are used to select the nearest neighbors. Finally, a regression step is used to get weights of the nearest neighbors and the imputation results. Traffic flow volume collected in Beijing was analyzed to compare this approach with the Bayesian Principle Component Analysis (BPCA) imputation approach. Tests show that this approach provides slightly better performance than BPCA imputation to impute missing traffic data. | Gang Chang Yi Zhang Danya Yao | 2012 | Tsinghua Science and Technology2012，17，3： | 6 |
| 2 | A Simulation System and Speed Guidance Algorithms for Intersection Traffic Control Using Connected Vehicle Technology显示文摘In the connected vehicle environment, real-time vehicle-state data can be obtained through vehicle-toinfrastructure communication, and the prediction accuracy of urban traffic conditions can significantly increase.This study uses the C++/Qt programming language and framework to build a simulation platform. A two-way six-lane intersection is set up on the simulation platform. In addition, two speed guidance algorithms based on optimizing the travel time of a single vehicle or multiple vehicles are proposed. The goal of optimization is to minimize the travel time, with common indicators such as average delay of vehicles, average number of stops, and average stop time chosen as indexes of traffic efficiency. When the traffic flow is not saturated, compared with the case of no speed guidance, single-vehicle speed guidance can improve the traffic efficiency by 20%, whereas multi-vehicle speed guidance can improve the traffic efficiency by 50%. When the traffic flow is saturated, the speed guidance algorithms show outstanding performance. The effect of speed guidance gradually enhances with increasing penetration rate, and the most obvious gains are obtained when the penetration rate increases from 10% to 40%. Thus, this study has shown that speed guidance in the connected vehicle environment can significantly improve the traffic efficiency of intersections, and the multi-vehicle speed guidance strategy is more effective than the single-vehicle speed guidance strategy. | Shuai Liu Weitong Zhang Xiaojun Wu Shuo Feng Xin Pei Danya Yao | 2019 | Tsinghua Science and Technology2019，24，2： | 6 |
| 3 | Application-Oriented Performance Comparison of 802.11p and LTE-V in a V2V Communication System显示文摘In recent years, the Vehicle-to-Vehicle(V2V) communication system has been considered one of the most promising technologies to build a much safer and more efficient transportation system. Both simulation and field test have been extensively performed to evaluate the performance of the V2V communication system. However,most of the evaluation methods are communication-based, and although in a transportation environment, lack a V2V application-oriented analysis. In this study, we conducted real-world tests and built an application-oriented evaluation model. The experiments were classified into four scenarios: static, following, face 2 face, and crossing vertically, which almost covered all the V2V communication patterns on the road. Under these scenarios, we conducted experiments and built a probability model to evaluate the performance of 802.11p and LTE-V in safetyrelated applications. Consequently, we found out that improvements are still needed in Non-Line-of-Sight scenarios. | Mengkai Shi Yi Zhang Danya Yao Chang Lu | 2019 | Tsinghua Science and Technology2019，24，2： | 4 |
| 4 | Transportation Mode Identification with GPS Trajectory Data and GIS Information显示文摘Global Positioning System(GPS) trajectory data can be used to infer transportation modes at certain times and locations. Such data have important applications in many transportation research fields, for instance,to detect the movement mode of travelers, calculate traffic flow in an area, and predict the traffic flow at a certain time in the future. In this paper, we propose a novel method to infer transportation modes from GPS trajectory data and Geographic Information System(GIS) information. This method is based on feature extraction and machine learning classification algorithms. While using GIS information to improve inference accuracy, we ensure that the algorithm is simple and easy to use on mobile devices. Applied to GeoLife GPS trajectory dataset, our method achieves 91.1% accuracy while inferring transportation modes, such as walking, bike, bus, car, and subway, with random forest classification algorithm. GIS features in our method improved the overall accuracy by 2.5% while raising the recall of the bus and subway transportation mode categories by 3.4% and 18.5%. We believe that many algorithms used in detecting the transportation modes from GPS trajectory data that do not utilize GIS information can improve their inference accuracy by using our GIS features, with a slight increase in the consumption of data storage and computing resources. | Ji Li Xin Pei Xuejiao Wang Danya Yao Yi Zhang Yun Yue | 2021 | Tsinghua Science and Technology2021，26，4： | 4 |
| 5 | Dangerous Driving Behavior Recognition and Prevention Using an Autoregressive Time-Series Model显示文摘Time headway is an important index used in characterizing dangerous driving behaviors. This research focuses on the decreasing tendency of time headway and investigates its association with crash occurrence. An autoregressive(AR) time-series model is improved and adopted to describe the dynamic variations of average daily time headway. Based on the model, a simple approach for dangerous driving behavior recognition is proposed with the aim of significantly decreasing headway. The effectivity of the proposed approach is validated by means of empirical data collected from a medium-sized city in northern China. Finally, a practical early-warning strategy focused on both the remaining life and low headway is proposed to remind drivers to pay attention to their driving behaviors and the possible occurrence of crash-related risks. | Hongxin Chen Shuo Feng Xin Pei Zuo Zhang Danya Yao | 2017 | Tsinghua Science and Technology2017，22，6： | 3 |
| 6 | Coronal plane deformity around the knee in the skeletally immature population:A review of principles of evaluation and treatment显示文摘Coronal plane deformity around the knee,also known as genu varum or genu valgum,is a common finding in clinical practice for pediatricians and orthopedists.These deformities can be physiological or pathological.If untreated,pathological deformities can lead to abnormal joint loading and a consequent risk of premature osteoarthritis.The aim of this review is to provide a framework for the diagnosis and management of genu varum and genu valgum in skeletally immature patients. | Valentino Coppa Mario Marinelli Roberto Procaccini Danya Falcioni Luca Farinelli Antonio Gigante | 2022 | World Journal of Orthopedics2022，13，5： | 2 |
| 7 | Spatial-Temporal ConvLSTM for Vehicle Driving Intention Prediction显示文摘Driving intention prediction from a bird’s-eye view has always been an active research area. However,existing research, on one hand, has only focused on predicting lane change intention in highway scenarios and, on the other hand, has not modeled the influence and spatiotemporal relationship of surrounding vehicles. This study extends the application scenarios to urban road scenarios. A spatial-temporal convolutional long short-term memory(ConvLSTM) model is proposed to predict the vehicle’s lateral and longitudinal driving intentions simultaneously. This network includes two modules: the first module mines the information of the target vehicle using the long short-term memory(LSTM) network and the second module uses ConvLSTM to capture the spatial interactions and temporal evolution of surrounding vehicles simultaneously when modeling the influence of surrounding vehicles. The model is trained and verified on a real road dataset, and the results show that the spatial-temporal ConvLSTM model is superior to the traditional LSTM in terms of accuracy, precision, and recall, which helps improve the prediction accuracy at different time horizons. | He Huang Zheni Zeng Danya Yao Xin Pei Yi Zhang | 2022 | Tsinghua Science and Technology2022，27，3： | 2 |
| 8 | Proteomics Profiling of Host Cell Response via Protein Expression and Phosphorylation upon Dengue Virus Infection显示文摘Dengue virus(DENV)infection is a worldwide public health threat.To date,the knowledge about the pathogenesis and progression of DENV infection is still limited.Combining global profiling based on proteomic analysis together with functional verification analysis is a powerful strategy to investigate the interplay between the virus and host cells.In the present study,quantitative proteomics has been applied to evaluate host responses(as indicated by altered proteins and modifications)in human cells(using K562 cell line)upon DENV-2 infection,as DENV-2 spreads most widely among all DENV serotypes.Comparative analysis was performed to define differentially expressed proteins in the infected cells compared to the mock-control,and it revealed critical pathogen-induced changes covering a broad spectrum of host cellular compartments and processes.We also discovered more dramatic changes(>20%,160 regulated phosphoproteins)in protein phosphorylation compared to protein expression(14%,321 regulated proteins).Most of these proteins/phosphoproteins were involved in transcription regulation,RNA splicing and processing,immune system,cellular response to stimulus,and macromolecule biosynthesis.Western blot analysis was also performed to confirm the proteomic data.Potential roles of these altered proteins were discussed.The present study provides valuable large-scale protein-related information for elucidating the functional emphasis of host cell proteins and their post-translational modifications in virus infection,and also provides insight and protein evidence for understanding the general pathogenesis and pathology of DENV. | Meng Miao Fei Yu Danya Wang Yongjia Tong Liuting Yang Jiuyue Xu Yang Qiu Xi Zhou Xiaolu Zhao | 2019 | Virologica Sinica2019，34，5： | 2 |
| 9 | Hyperthyroidism hidden by congenital central hypoventilation syndrome显示文摘 | Danya A. Fox Debra E. Weese-Mayer David F. Wensley Laura L. Stewart | 2015 | Journal of Pediatric Endocrinology and Metabolism . 2015 (5-6)2015，，5： | 1 |
| 10 | Emotional Abuse and Neglect (Psychological Maltreatment): a Conceptual Framework显示文摘 | Danya Glaser | 2002 | Child Abuse Neglect2002，，26： | 1 |
| 11 | 真挚的情感与表达——法国设计师Bouroullec兄弟与作品 | Danya | 2012 | 现代装饰(家居)2012，0，6： | 1 |
| 12 | Receptor/transporter-independent targeting of functional peptides across the plasma membrane 显示文摘 | Ruth Ann Veach Danya Liu Shan Yao | 2004 | J Biol Chem2004，279，11： | 1 |
| 13 | Intraeellular protein therapy with SOCS3 inhibits inflammation and apoptosis 显示文摘 | Daewoong Jol Danya Liul | 2005 | Nature medicine2005，11，8： | 1 |
| 14 | Child Abuse and Neglect and the Brain A Review显示文摘 | Danya Glaser | 2000 | Journal of Child Psy- chology and Psychiatry2000，41，1： | 1 |
| 15 | The use of simultaneous iterative reconstruction technique for electrical capacitance tomography显示文摘 | Su Bangliang Zhang Yiheng Peng Lihui Yao Danya Zhang Baofen | 2000 | Chemical Engineering Journal2000，77，： | 1 |
| 16 | Simultaneously Prediction of Network Traffic Flow Based on PCA-SVR显示文摘 | Jin Xuexiang Zhang Yi Yao Danya | 2007 | Advanced in Neural Networks2007，44，1： | 1 |
| 17 | Evolution of crystallographic grain orientation and anisotropic properties of (K 0.5 Na 0.5 )NbO 3 ceramics using BaTiO 3 templates by reactive templated grain growth显示文摘 | Danya Lv Ruzhong Zuo | 2013 | Journal of Alloys and Compounds2013，，： | 1 |
| 18 | Reactive templated grain growth and anisotropic electrical properties of (Na 0.5 K 0.5 )NbO 3 ceramics without sintering aids显示文摘 | Danya Lv Ruzhong Zuo Shi Su | 2012 | Journal of Materials Science: Materials in Electronics2012，，7： | 1 |
| 19 | 'Everyone called me grandma' : Public housing demolitionand relocation among older adultsin Atlanta显示文摘 | Danya E Keene Erin Ruel | 2013 | Cities2013，35，： | 1 |
| 20 | Child abuse and neglect and the brain a review显示文摘 | Danya Glaser | 2000 | J of Child Psychology and Psychiatry2000，41，1： | 1 |
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