Transportmetrica最新文献

Correlation of levels of lactic acid and glucose in cerebrospinal fluid of cerebral hemorrhage patients with the occurrence of postoperative intracranial infection and clinical prognosis. 脑出血患者脑脊液中乳酸和葡萄糖水平与术后颅内感染发生及临床预后的相关性。

IF 2.5

Transportmetrica Pub Date : 2024-01-25 DOI: 10.5937/jomb0-44058

Lei Zhang, Yan Zhang, Xiaotian Wang, Yun Zhao

{"title":"Correlation of levels of lactic acid and glucose in cerebrospinal fluid of cerebral hemorrhage patients with the occurrence of postoperative intracranial infection and clinical prognosis.","authors":"Lei Zhang, Yan Zhang, Xiaotian Wang, Yun Zhao","doi":"10.5937/jomb0-44058","DOIUrl":"10.5937/jomb0-44058","url":null,"abstract":"Background: Cerebral haemorrhage is a critical condition that often requires surgical treatment, and postoperative intracranial infection can significantly impact patient outcomes. The aim of the study was to examine the relationship between the levels of lactic acid and glucose in cerebrospinal fluid (CSF) of patients with cerebral haemorrhage and their postoperative intracranial infection and clinical prognosis.Methods: The study selected the clinical data of 324 patients with cerebral haemorrhage who underwent surgical treatment in our hospital from March 2020 to March 2022 for retrospective analysis and divided these patients into the intracranial infection group (Group A, n=22, leukocyte values in CSF>5×106/L) and the non-intracranial infection group (Group B, n=302, leukocyte values in CSF 5×106/L) according to the occurrence of postoperative intracranial infection in patients to detect the levels of lactic acid and glucose in CSF at different times in the two groups. Pearson method was adopted to analyze the correlation of the levels of lactic acid and glucose in CSF of patients with intracranial infection, and the Glasgow Outcome Scale (GOS) was used to assess the clinical prognosis of patients. According to their scores, these patients were divided into the good prognosis group (GPG, scores of 4-5 points, n=178) and the poor prognosis group (PPG, scores of 1-3 points, n=146). The levels of lactic acid and glucose in the CSF of patients in the two groups were measured, and the Pearson method was adopted to analyze the relationship between these levels and clinical prognosis.","PeriodicalId":49416,"journal":{"name":"Transportmetrica","volume":"1 1","pages":"36-42"},"PeriodicalIF":2.5,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10943468/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82565044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Applying an improved calibration method in the safety evaluation framework for the open tolling system 一种改进的标定方法在开放式收费系统安全评价框架中的应用

Transportmetrica Pub Date : 2023-10-20 DOI: 10.1080/23249935.2023.2270759

Seung-oh Son, Kyeongju Kwon, Juneyoung Park, Mohamed Abdel-Aty

{"title":"Applying an improved calibration method in the safety evaluation framework for the open tolling system","authors":"Seung-oh Son, Kyeongju Kwon, Juneyoung Park, Mohamed Abdel-Aty","doi":"10.1080/23249935.2023.2270759","DOIUrl":"https://doi.org/10.1080/23249935.2023.2270759","url":null,"abstract":"AbstractThis study proposed an improved calibration method in the safety evaluation framework and analysed the safety effect of installing the open road tolling (ORT) system. Although the ORT system in South Korea has recently installed in many tollgate sections, it is impossible to collect statistically significant crash data. Therefore, the safety benefits were estimated and compared by (1) applying the general calibration way suggested in the Highway Safety Manual, (2) the recent calibration research from Florida and (3) the improved calibration method suggested in this study. In the result, safety improvement effect of ORT installation was 43% to 51%. Additionally, the calibration function using the quadratic model showed the best performance. This study is meaningful in that the safety effectiveness was estimated using the calibration method when the sample size was insufficient, and it utilises new functions to predict nonlinear relationships that are difficult to calibrate with simple linear relationships.KEYWORDS: Calibration methodsafety effectshighway safety manualopen road tolling Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work is supported by the Korea Agency for Infrastructure Technology Advancement(KAIA) grant funded by the Ministry of Land, Infrastructure and Transport (Grant RS-2021-KA163182).","PeriodicalId":49416,"journal":{"name":"Transportmetrica","volume":"158 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135569995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The optimal solution to the energy-efficient train control in a multi-trains system–Part 2: the optimality and the uniqueness 多列车系统节能列车控制的最优解——第二部分:最优性与唯一性

Transportmetrica Pub Date : 2023-10-18 DOI: 10.1080/23249935.2023.2270330

Yu Rao, Xiaoyun Feng, Qingyuan Wang, Pengfei Sun

{"title":"The optimal solution to the energy-efficient train control in a multi-trains system–Part 2: the optimality and the uniqueness","authors":"Yu Rao, Xiaoyun Feng, Qingyuan Wang, Pengfei Sun","doi":"10.1080/23249935.2023.2270330","DOIUrl":"https://doi.org/10.1080/23249935.2023.2270330","url":null,"abstract":"AbstractWhen a train travels in a multi-trains system, the power flow of other trains and the track grades make up the spatial–temporal area (STA) for the train. Finding the optimal solution for the energy-efficient train control (EETC) problem in STA can help reduce the net energy consumption. This paper studies the analytic method to obtain the optimal solution. In Part 1, the algorithm for the problem was designed. The underlying structure of the algorithm is the connection between three optimal states through optimal feasible strategy. In Part 2, the optimality of the optimal feasible strategy is verified through a generalised local energy functional, and its uniqueness is proved based on the variational method. Additionally, we discuss the influence of external power on the optimal solution of the classical EETC problem. Case studies using data for a real freight railway line are given to illustrate our results.KEYWORDS: Optimal train controlenergy savingPontryagin’s Maximum Principlenet energy consumption AcknowledgmentsThis work was supported by the National Natural Science Foundation of China under Grant 62003283 and the National Key Research and Development Program of China under Grant 2021YFB2601500.Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementThe data that support the findings of this study are available from the corresponding author upon reasonable request.Authors’ contributionsYu Rao: Conceptualization, Methodology, Software, Writing-original draft. Xiaoyun Feng: Methodology, Validation. Qingyuan Wang: Supervision, Visualization. Pengfei Sun: Conceptualization, Writing-review & editing.","PeriodicalId":49416,"journal":{"name":"Transportmetrica","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135885205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Artificial intelligence in automatic passenger counting: cost-efficient validation using the partitioned equivalence test 自动乘客计数中的人工智能:使用分区等效检验的成本效益验证

Transportmetrica Pub Date : 2023-10-18 DOI: 10.1080/23249935.2023.2267702

David Ellenberger, Michael Siebert

引用次数: 0

Exploring the spatiotemporal correlation among traffic crashes on arterials with signal coordination 基于信号协调的交通事故时空相关性研究

Transportmetrica Pub Date : 2020-12-17 DOI: 10.1080/23249935.2020.1860154

Yingfei Fan, Runhua Guo, Xinguo Jiang, Mengqing Xu, Guopeng Zhang, Xiang Li, Shiwei Xu, Qi Liang

引用次数: 2

The stochastic multi-modal hub location problem with direct link strategy and multiple capacity levels for cargo delivery systems 具有直连策略和多容量水平的货物运输系统随机多式联运枢纽定位问题

Transportmetrica Pub Date : 2020-07-28 DOI: 10.1080/23249935.2020.1776787

Xiaoting Shang, Kai Yang, B. Jia, Ziyou Gao

引用次数: 16

Service quality effects on air passenger intentions: a service chain perspective 服务质量对航空旅客意愿的影响:服务链视角

Transportmetrica Pub Date : 2012-11-01 DOI: 10.1080/18128602.2010.548837

Yu-Chiun Chiou, Yen-Heng Chen

{"title":"Service quality effects on air passenger intentions: a service chain perspective","authors":"Yu-Chiun Chiou, Yen-Heng Chen","doi":"10.1080/18128602.2010.548837","DOIUrl":"https://doi.org/10.1080/18128602.2010.548837","url":null,"abstract":"This study divides entire airline services into eight service stages and uses a second-order confirmatory factor analysis (CFA) to constitute service quality and to examine the causal relationships between two consecutive service stages from a service chain perspective. Two conceptual frameworks – overall framework and service chain framework are proposed. The former incorporates the constructs of service quality, sacrifice, servicescape, service value, satisfaction, switching barriers, and behavioural intentions combined with seven hypothetical causal relationships. The latter depicts seven hypothetical causal relationships between two consecutive service stages. The proposed models are validated by a case study of Spring Airlines, a low-cost carrier (LCC) based in China. The empirical results support all hypotheses except hypothesis 7 that service quality positively impacts behavioural intentions. Notably, test results for the interrelationships between two consecutive service stages suggest that a lack of satisfaction at a specific service stage will affect customer perception of the consequent service stage. Therefore, to improve the service quality for a service stage, the service quality of all upstream service stages must be improved first. This study also found that service quality has a large effect although not direct on behavioural intentions while sacrifice has the smallest effect. A low-fare strategy may not be effective when an airline fails to deliver high-quality service.","PeriodicalId":49416,"journal":{"name":"Transportmetrica","volume":"8 1","pages":"406 - 426"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/18128602.2010.548837","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59925806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 50

The impact of traffic images on travel time valuation in stated-preference choice experiments 状态偏好选择实验中交通图像对出行时间评价的影响

Transportmetrica Pub Date : 2012-11-01 DOI: 10.1080/18128602.2010.551524

L. Rizzi, Juan Pablo Limonado, S. Steimetz

引用次数: 27

Three new models for the flow–density relationship: derivation and testing for freeway and urban data 三种新的流量-密度关系模型:高速公路和城市数据的推导和检验

Transportmetrica Pub Date : 2012-11-01 DOI: 10.1080/18128602.2011.556680

J. M. del Castillo

引用次数: 58

An ant colony system-based hybrid algorithm for an emergency roadway repair time-space network flow problem 基于蚁群系统的道路应急修复时空网络流问题混合算法

Transportmetrica Pub Date : 2012-09-01 DOI: 10.1080/18128602.2010.515550

S. Yan, Y. Shih

引用次数: 48