Complexity最新文献_第4页

Spatiotemporal Differences in Regional Tourism Efficiency: An Empirical Study From Guangdong Province, China 区域旅游效率的时空差异：中国广东省的实证研究

IF 1.7 4区工程技术

Complexity Pub Date : 2024-11-14 DOI: 10.1155/2024/5781877

Haifei Wang

{"title":"Spatiotemporal Differences in Regional Tourism Efficiency: An Empirical Study From Guangdong Province, China","authors":"Haifei Wang","doi":"10.1155/2024/5781877","DOIUrl":"https://doi.org/10.1155/2024/5781877","url":null,"abstract":"<div>\u0000 <p>The focus on high-quality development in regional tourism involves not only transforming the previous extensive development model and improving the efficiency of tourism development but also promoting the coordinated development of the tourism industry across different regions. Taking the 21 prefecture-level cities in Guangdong Province as the research object and guided by high-quality development, a tourism efficiency measurement index system that includes carbon emissions as an unexpected output has been established. By comprehensively applying methods such as the Super-SBM model, LISA temporal path, and standard deviation ellipse, this study addresses the neglect of spatial relationships in the existing literature and measures the tourism efficiency of Guangdong’s 21 prefecture-level administrative units from 2009 to 2019, exploring its spatiotemporal evolution and collaborative trends. The results show that during the research period, the average tourism efficiency in Guangdong Province was 0.807, at a medium–high efficiency level. Spatially, the tourism efficiency of the province is composed of a main peak and side peaks, with a general leftward shift of the main peak, a fluctuating decrease in peak height, and an expanding width. The evolution of spatial patterns reveals that regions with similar tourism efficiency in Guangdong tend to be spatially concentrated, with strong local stability and clear spatial dependency in the change process of tourism efficiency. The study’s insights suggest strategies for Guangdong’s tourism sector, advocating for technological innovation, sustainable development practices, and a robust evaluation framework. It emphasizes leveraging regional tourism assets, fostering collaboration, and promoting the “Great Lingnan Tourism Circle” for a balanced industry growth.</p>\u0000 </div>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/5781877","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142642207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Western North American Cruise Shipping Network: Space Structure and System 北美西部邮轮航运网络：空间结构与系统

IF 1.7 4区工程技术

Complexity Pub Date : 2024-10-28 DOI: 10.1155/2024/9190221

Xumao Li, Chang Li, Zukun Long

引用次数: 0

Improving the Machine Learning Stock Trading System: An N-Period Volatility Labeling and Instance Selection Technique 改进机器学习股票交易系统：一种 N 期波动标签和实例选择技术

IF 1.7 4区工程技术

Complexity Pub Date : 2024-10-22 DOI: 10.1155/2024/5036389

Young Hun Song, Myeongseok Park, Jaeyun Kim

{"title":"Improving the Machine Learning Stock Trading System: An N-Period Volatility Labeling and Instance Selection Technique","authors":"Young Hun Song, Myeongseok Park, Jaeyun Kim","doi":"10.1155/2024/5036389","DOIUrl":"https://doi.org/10.1155/2024/5036389","url":null,"abstract":"<div>\u0000 <p>Financial technology is crucial for the sustainable development of financial systems. Algorithmic trading, a key area in financial technology, involves automated trading based on predefined rules. However, investors cannot manually analyze all market patterns and establish rules, necessitating the development of supervised learning trading systems that can discover market patterns using machine or deep learning techniques. Many studies on supervised learning trading systems rely on up–down labeling based on price differences, which overlooks the issues of nonstationarity, complexity, and noise in stock data. Therefore, this study proposes an N-period volatility trading system that addresses the limitations of up–down labeling systems. The N-period volatility trading system measures price volatility to address uncertainty and enables the construction of a stable, long-term trading system. Additionally, an instance-selection technique is utilized to address the limitations of stock data, including noise, nonlinearity, and complexity, while effectively reducing the data size. The effectiveness of the proposed model is evaluated through trading simulations of stocks comprising the NASDAQ 100 index and compared with up–down labeling trading systems. The experimental results demonstrate that the proposed N-period volatility trading system exhibits higher stability and profitability than other trading systems.</p>\u0000 </div>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/5036389","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142525091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Who Leads Trends on Q&A Platforms? Identifying and Analyzing Trend Discoverers 谁在问答平台上引领趋势？识别和分析趋势发现者

IF 1.7 4区工程技术

Complexity Pub Date : 2024-10-19 DOI: 10.1155/2024/2011436

Yongning Li, Lun Zhang, Ye Wu, Tianlan Wei

引用次数: 0

Transient Stability Assessment Model With Sample Selection Method Based on Spatial Distribution 基于空间分布的样本选择方法的瞬态稳定性评估模型

IF 1.7 4区工程技术

Complexity Pub Date : 2024-10-17 DOI: 10.1155/2024/5231569

Yongbin Li, Yiting Wang, Jian Li, Huanbei Zhao, Huaiyuan Wang, Litao Hu

{"title":"Transient Stability Assessment Model With Sample Selection Method Based on Spatial Distribution","authors":"Yongbin Li, Yiting Wang, Jian Li, Huanbei Zhao, Huaiyuan Wang, Litao Hu","doi":"10.1155/2024/5231569","DOIUrl":"https://doi.org/10.1155/2024/5231569","url":null,"abstract":"<div>\u0000 <p>With the phasor measurement units (PMUs) being widely utilized in power systems, a large amount of data can be stored. If transient stability assessment (TSA) method based on the deep learning model is trained by this dataset, it requires high computation cost. Furthermore, the fact that unstable cases rarely occur would lead to an imbalanced dataset. Thus, power system transient stability status prediction has the bias problem caused by the imbalance of sample size and class importance. Faced with such a problem, a TSA model based on the sample selection method is proposed in this paper. Sample selection aims to optimize the training set to speed up the training process while improving the preference of the TSA model. The typical samples which can accurately express the spatial distribution of the raw dataset are selected by the proposed method. Primarily, based on the location of training samples in the feature space, the border samples are selected by trained support vector machine (SVM), and the edge samples are selected by the assistance of the approximated tangent hyperplane of a class surface. Then, the selected samples are input to stacked sparse autoencoder (SSAE) as the final classifier. Simulation results in the IEEE 39-bus system and the realistic regional power system of Eastern China show the high performance of the proposed method.</p>\u0000 </div>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/5231569","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142447781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stability Analysis and Simulation of Diffusive Vaccinated Models 扩散式疫苗接种模型的稳定性分析与模拟

IF 1.7 4区工程技术

Complexity Pub Date : 2024-10-11 DOI: 10.1155/2024/5595996

Mohammed M. Al-Shamiri, N. Avinash, P. Chellamani, Manal Z. M. Abdallah, G. Britto Antony Xavier, V. Rexma Sherine, M. Abisha

{"title":"Stability Analysis and Simulation of Diffusive Vaccinated Models","authors":"Mohammed M. Al-Shamiri, N. Avinash, P. Chellamani, Manal Z. M. Abdallah, G. Britto Antony Xavier, V. Rexma Sherine, M. Abisha","doi":"10.1155/2024/5595996","DOIUrl":"https://doi.org/10.1155/2024/5595996","url":null,"abstract":"<div>\u0000 <p>This paper begins by analyzing the key mathematical properties of diffusive vaccinated models, including existence, uniqueness, positivity, and boundedness. Equilibria are identified, and the basic reproductive number is calculated. The Banach contraction mapping principle is applied to rigorously establish the solution existence and uniqueness. In order to understand the disease’s time transmission, it is important to examine the global stability of the equilibrium points. Disease-free equilibrium and endemic equilibrium are the two equilibria in this model. Here, we demonstrate that the endemic equilibrium is worldwide asymptotic stable when the basic reproductive number is greater than 1, and the disease-free equilibrium is globally asymptotic stable whenever the basic reproductive number is less than 1. Moreover, based on the Caputo fractional derivative of order and the implicit Euler’s approximation, we offered an unconditionally stable numerical solution for the resultant system. This work explores the solution of some significant population models of noninteger order using an approach known as the iterative Laplace transform. The proposed methodology is developed by effectively combining Laplace transformation with an iterative procedure. A series form solution that exhibits some convergent behavior towards the precise solution can be attained. It is noted that there is a close contact between the obtained and precise solutions. Moreover, the suggested method can handle a variety of fractional order derivative problems because it involves minimal computations. This information will be helpful in further studies to determine the ideal strategy of action for preventing or stopping the spread disease transmission.</p>\u0000 </div>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/5595996","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142429693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Utilizing Entropy to Systematically Quantify the Resting-Condition Baroreflex Regulation Function 利用熵系统量化静息状态下的气压反射调节功能

IF 1.7 4区工程技术

Complexity Pub Date : 2024-10-03 DOI: 10.1155/2024/5514002

Bo-Yuan Li, Xiao-Yang Li, Xia Lu, Rui Kang, Zhao-Xing Tian, Feng Ling

{"title":"Utilizing Entropy to Systematically Quantify the Resting-Condition Baroreflex Regulation Function","authors":"Bo-Yuan Li, Xiao-Yang Li, Xia Lu, Rui Kang, Zhao-Xing Tian, Feng Ling","doi":"10.1155/2024/5514002","DOIUrl":"https://doi.org/10.1155/2024/5514002","url":null,"abstract":"<div>\u0000 <p>Baroreflex is critical to maintain blood pressure homeostasis, and the quantification of baroreflex regulation function (BRF) can provide guidance for disease diagnosis, treatment, and healthcare. Current quantification of BRF such as baroreflex sensitivity cannot represent BRF systematically. From the perspective of complex systems, we regard that BRF is the emergence result of fluctuate states and interactions in physiological mechanisms. Therefore, the three-layer emergence is studied in this work, which is from physiological mechanisms to physiological indexes and then to BRF. On this basis, since the entropy in statistical physics macroscopically measures the fluctuations of system’s states, in this work, the principle of maximum entropy is adopted, and a new index called PhysioEnt is proposed to quantify the fluctuations of four physiological indexes, i.e., baroreflex sensitivity, heart rate, heart rate variability, and systolic blood pressure, which aims to represent BRF in the resting condition. Further, two datasets with different subjects are analyzed, and some new findings can be obtained, such as the contributions of the physiological interactions among organs/tissues. With measurable indexes, the proposed method is expected to support individualized medicine.</p>\u0000 </div>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/5514002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142429265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Reliability Indicators for Inverted Lomax Model via Improved Adaptive Type-II Progressive Censoring Plan with Applications 通过改进的自适应 II 型渐进式删减计划分析倒 Lomax 模型的可靠性指标及其应用

IF 1.7 4区工程技术

Complexity Pub Date : 2024-10-03 DOI: 10.1155/2024/4848673

Refah Alotaibi, Mazen Nassar, Ahmed Elshahhat

{"title":"Analysis of Reliability Indicators for Inverted Lomax Model via Improved Adaptive Type-II Progressive Censoring Plan with Applications","authors":"Refah Alotaibi, Mazen Nassar, Ahmed Elshahhat","doi":"10.1155/2024/4848673","DOIUrl":"https://doi.org/10.1155/2024/4848673","url":null,"abstract":"<div>\u0000 <p>Employing an improved adaptive Type-II progressively censored sample, this paper provides various point and interval estimations when the parent distribution of the population to be studied is the inverted Lomax distribution. The estimations include both the model parameters and two reliability metrics, namely, the reliability and failure rate functions. Both maximum likelihood and maximum product of spacing are studied from the conventional estimation standpoint. Along with the point estimations utilizing the two traditional approaches, the approximate confidence intervals based on both are also examined. The Bayesian point estimations with the squared error loss function and credible intervals for various parameters are investigated. Depending on the source of observed data, Bayesian estimations are obtained using two different types of posterior distributions. Numerous censoring designs are looked at in the simulation study to compare the accuracy of classical and Bayesian estimations. Using both conventional methodologies, several optimality metrics are suggested to identify the best removal design. One chemical and a pair of engineering actual data sets are examined to support the significance of the indicated methodologies. The analysis showed that the Bayesian estimation, using the likelihood function, is preferable when compared to other classical and Bayesian methods.</p>\u0000 </div>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/4848673","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142429226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling the Social Influence Effectiveness of Popular Weibo Events 热门微博事件的社会影响效果建模

IF 1.7 4区工程技术

Complexity Pub Date : 2024-09-30 DOI: 10.1155/2024/6457115

Haoyang Lin, Zhiyuan Zhang

{"title":"Modeling the Social Influence Effectiveness of Popular Weibo Events","authors":"Haoyang Lin, Zhiyuan Zhang","doi":"10.1155/2024/6457115","DOIUrl":"https://doi.org/10.1155/2024/6457115","url":null,"abstract":"<div>\u0000 <p>Social networks are important for people to obtain information, make comments, and exchange opinions. The public opinion generated in social networks has a great impact on public life and value guidance, and the effect of public opinion is worth paying attention to and analyzing. Research on the influence of hot events can help us better understand the public attention and response to an event, and help industries and social organizations to judge market trends and predict future development direction. Social phenomena and trends reflected by hot events can be used as basic data and research objects for scientific research to promote the development and progress of the discipline. Aiming at social events in social networks, this paper analyzes the relevant user behavior data such as retweets, comments, likes, topic characteristics such as event duration, and other key characteristics and proposes an influence effectiveness analysis model for events, referred to as the caloric value model. This model is based on factors such as user interactivity, event activity, duration of the event, freshness of events,media attention, and the event heat decay ratio. It evaluates event heat, calculates the influence of events, identifies hot events with a high level of discussion, selects these hot events, and validates the findings through experiments. The model proposed in this paper has a good effect on the rationality and feasibility of heat evaluation.</p>\u0000 </div>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/6457115","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Towards Robust Evaluation of Aesthetic and Photographic Quality Metrics: Insights from a Comprehensive Dataset 实现对美学和摄影质量指标的可靠评估：综合数据集的启示

IF 1.7 4区工程技术

Complexity Pub Date : 2024-09-26 DOI: 10.1155/2024/8223586

Iria Santos, Miguel A. Casal, João Correia, Álvaro Torrente-Patiño, Penousal Machado, Juan Romero

{"title":"Towards Robust Evaluation of Aesthetic and Photographic Quality Metrics: Insights from a Comprehensive Dataset","authors":"Iria Santos, Miguel A. Casal, João Correia, Álvaro Torrente-Patiño, Penousal Machado, Juan Romero","doi":"10.1155/2024/8223586","DOIUrl":"https://doi.org/10.1155/2024/8223586","url":null,"abstract":"<div>\u0000 <p>In recent years, the development of metrics to evaluate image aesthetics and photographic quality has proliferated. However, validating these metrics presents challenges due to the inherently subjective nature of aesthetics and photographic quality, which can be influenced by cultural contexts and individual preferences that evolve over time. This article presents a novel validation methodology utilizing a dataset assessed by individuals from two distinct nationalities: the United States and Spain. Evaluation criteria include photographic quality and aesthetic value, with the dataset comprising images previously rated on the DPChallenge photographic portal. We analyze the correlation between these values and provide the dataset for future research endeavors. Our investigation encompasses several metrics, including BRISQUE for assessing photographic quality, NIMA aesthetic and NIMA technical for evaluating both aesthetic and technical aspects, Diffusion Aesthetics (employed in Stable Diffusion), and PhotoILike for gauging the commercial appeal of real estate images. Our findings reveal a significant correlation between the Diffusion Aesthetics metric and aesthetic measures, as well as with the NIMA aesthetics metric, suggesting them as good potential candidates to capture aesthetic value.</p>\u0000 </div>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/8223586","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142324602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0