scholarly journals Design and Control Method of Switchable On- or Off-Ramp for Urban Highway

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Yugang Liu ◽  
Hongbo Yi ◽  
Jiali Li ◽  
Bin Chen ◽  
Hongtai Yang
Keyword(s):  
Traffic Flow ◽  
Control Method ◽  
High Volume ◽  
Main Road ◽  
Time Space ◽  
Time Period ◽  
Total Travel Time ◽  
Short Time ◽  
And Control ◽  
The Impact

High volume of traffic is loaded on urban highway during peak hours as well as the ramp connecting main road and auxiliary road of highway. Once the demand exceeds the capacity of the ramp, congestion may happen on both main road and the auxiliary road. To deal with this problem, an new urban highway ramp, switchable ramp (SR) that can switch between on and off condition, is proposed in this paper. A macroscopic time-space discrete model is built in this paper to model this process by dividing the studied time period into short time periods and the studied road segment into small sections. The impact of the type of ramp on upstream and downstream traffic flow is analyzed. A segment of urban highway in Chengdu, China, is used as a case study. The traffic flow data in peak hours is collected and used. Mathematical analysis proves that the SR system proposed in this paper can reduce the total travel time (TTT) in the studied area. Results show that the SR system is more useful when the traffic volume is high.

scholarly journals A Comparative UAV Forensic Analysis: Static and Live Digital Evidence Traceability Challenges

Drones ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 42
Author(s):  
Fahad E. Salamh ◽  
Umit Karabiyik ◽  
Marcus K. Rogers ◽  
Eric T. Matson
Keyword(s):  
High Volume ◽  
Forensic Analysis ◽  
Digital Evidence ◽  
Incident Response ◽  
Scientific Contribution ◽  
Response Plan ◽  
Technical Challenges ◽  
And Control ◽  
The Impact ◽  
Categorization Model

The raising accessibility of Unmanned Aerial Vehicles (UAVs), colloquially known as drones, is rapidly increasing. Recent studies have discussed challenges that may come in tow with the growing use of this technology. These studies note that in-depth examination is required, especially when addressing challenges that carry a high volume of software data between sensors, actuators, and control commands. This work underlines static and live digital evidence traceability challenges to further enhance the UAV incident response plan. To study the live UAV forensic traceability issues, we apply the `purple-teaming’ exercise on small UAVs while conducting UAV forensic examination to determine technical challenges related to data integrity and repeatability. In addition, this research highlights current static technical challenges that could pose more challenges in justifying the discovered digital evidence. Additionally, this study discusses potential drone anti-forensic techniques and their association with the type of use, environment, attack vector, and level of expertise. To this end, we propose the UAV Kill Chain and categorize the impact and complexity of all highlighted challenges based on the conducted examination and the presented scientific contribution in this work. To the best of our knowledge, there has not been any contribution that incorporates `Purple-Teaming’ tactics to evaluate UAV-related research in cybersecurity and digital forensics. This work also proposes a categorization model that classifies the discovered UAV static and live digital evidence challenges based on their complexity and impact levels

scholarly journals A Data Driven Change-point Epidemic Model for Assessing the Impact of Large Gathering and Subsequent Movement Control Order on COVID-19 Spread in Malaysia

2020 ◽  
Author(s):  
Sarat C. Dass ◽  
Wai M. Kwok ◽  
Gavin J. Gibson ◽  
Balvinder S. Gill ◽  
Bala M. Sundram ◽  
...  
Keyword(s):  
Change Point ◽  
Movement Control ◽  
Disease Spread ◽  
Time Period ◽  
Before And After ◽  
Quantitative Understanding ◽  
Control Order ◽  
Short Time ◽  
The Impact ◽  
Second Wave

AbstractThe second wave of COVID-19 in Malaysia is largely attributed to a mass gathering held in Sri Petaling between February 27, 2020 and March 1, 2020, which contributed to an exponential rise of COVID-19 cases in the country. Starting March 18, 2020, the Malaysian government introduced four consecutive phases of a Movement Control Order (MCO) to stem the spread of COVID-19. The MCO was implemented through various non-pharmaceutical interventions (NPIs). The reported number of cases reached its peak by the first week of April and then started to reduce, hence proving the effectiveness of the MCO. To gain a quantitative understanding of the effect of MCO on the dynamics of COVID-19, this paper develops a class of mathematical models to capture the disease spread before and after MCO implementation in Malaysia. A heterogeneous variant of the Susceptible-Exposed-Infected-Recovered (SEIR) model is developed with additional compartments for asymptomatic transmission. Further, a change-point is incorporated to model the before and after disease dynamics, and is inferred based on data. Related statistical analyses for inference are developed in a Bayesian framework and are able to provide quantitative assessments of (1) the impact of the Sri Petaling gathering, and (2) the extent of decreasing transmission during the MCO period. The analysis here also quantitatively demonstrates how quickly transmission rates fall under effective NPI implemention within a short time period.

The Impact of Information Systems on Management Performance in the Pharmaceutical Industry

2015 ◽  
Vol 17 (3) ◽  
pp. 56-73 ◽  
Author(s):  
Sherif Elshorbagy ◽  
Lalit Garg ◽  
Vipul Gupta ◽  
Gopalakrishnan Narayanamurthy ◽  
Yosuf Abd Al Oraini
Keyword(s):  
Pharmaceutical Industry ◽  
Pharmaceutical Companies ◽  
Successful Implementation ◽  
Strategic Decisions ◽  
Management Performance ◽  
Business Operations ◽  
Lack Of Information ◽  
Short Time ◽  
And Control ◽  
The Impact

There are many aspects that should be considered while implementing ISs in pharmaceutical companies. This is due to the various regulations and standards that the governmental authorities impose on these companies. In addition, any audit from US Food and Drug Administration (FDA) or other authorities will require computer system validation to be performed for the implemented ISs to ensure that all areas that affect the drugs lifecycle are following the required standards, and that each single process in this lifecycle is validated. Unfortunately, many pharmaceutical companies didn't recognize yet the importance of ISs to their businesses. The research presented in this paper examines the value of using an information system (IS) in pharmaceutical environment and how it can be a key component of improving the operational and process effectiveness by supporting the strategic decisions and enabling the decision-makers to take their decisions in short time. Lack of information in pharmaceutical companies is one of the reasons why these companies will not be able to compete in this competitive market because the delays in taking decisions, product lifecycle, and supply chain. Pharmaceutical companies required to follow various regulations and standards, and ISs are the tools that can be mapped to these standards and control the business operations without any obstacles. The authors conducted a comprehensive study to investigate the role of ISs in the pharmaceutical industry through a review of existing literatures relevant to the research subject and through a questionnaire survey with 54 participants working in the pharmaceutical industry in different countries in the Middle East. The survey aimed to understand the present status of ISs in pharmaceutical companies and the impact of ISs on management performance, operation improvement, end-users productivity, and compliance with the regulations and standards of the pharmaceutical industry in their companies. Moreover, the survey also aimed to identify the catalysts behind successful implementation of ISs.

scholarly journals New Integrated Guidance and Control of Homing Missiles with an Impact Angle against a Ground Target

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Shengjiang Yang ◽  
Jianguo Guo ◽  
Jun Zhou
Keyword(s):  
Control System ◽  
Control Method ◽  
Sliding Mode ◽  
Lyapunov Stability Theory ◽  
Impact Angle ◽  
Guidance And Control ◽  
Ground Target ◽  
Integrated Guidance And Control ◽  
And Control ◽  
The Impact

A new integrated guidance and control (IGC) law is investigated for a homing missile with an impact angle against a ground target. Firstly, a control-oriented model with impact angle error of the IGC system in the pitch plane is formulated by linear coordinate transformation according to the motion kinematics and missile dynamics model. Secondly, an IGC law is proposed to satisfy the impact angle constraint and to improve the rapidity of the guidance and control system by combining the sliding mode control method and nonlinear extended disturbance observer technique. Thirdly, stability of the closed-loop guidance and control system is proven based on the Lyapunov stability theory, and the relationship between the accuracy of the impact angle and the estimate errors of nonlinear disturbances is derived from stability of the sliding mode. Finally, simulation results confirm that the proposed IGC law can improve the performance of the missile guidance and control system against a ground target.

Simulation Research of Flow and Speed on Urban Expressway Interchange Entrance

2013 ◽  
Vol 779-780 ◽  
pp. 796-799
Author(s):  
Liang Wang ◽  
Yu Jie Wang ◽  
Ling Yu Wang
Keyword(s):  
Traffic Flow ◽  
Road Traffic ◽  
Service Level ◽  
Simulation Software ◽  
Simulation Research ◽  
Main Road ◽  
Microscopic Traffic Simulation ◽  
Urban Expressway ◽  
Traffic Capacity ◽  
And Control

The urban expressway overpass entrance is an important node of the urban road system. Traffic jams often happen at entrance. The characteristics of urban expressway entrance and the advantages of the microscopic traffic simulation were combined to analyze capacity of entrance. VISSIM simulation software was used and the validity of the simulation model was verified. The influence of the main road traffic flow and the desired speed of entrance to flow and speed of the urban expressway entrance were analyzed through simulation experiment. On the whole, traffic capacity of urban expressway entrance reduces with the increase of traffic flow on the main road. The higher the desired speed is, the faster traffic capacity reduces. The increase of speed and control of main road traffic flow is of great significance for improving the capacity and service level of expressway.

Research on Process of Impact and Control with Underwater Autonomous Weapon System

2011 ◽  
Vol 204-210 ◽  
pp. 862-865
Author(s):  
Peng Fei Peng ◽  
Zhong Liu ◽  
Jun Jiang
Keyword(s):  
Numerical Simulation ◽  
Process Model ◽  
Control Method ◽  
Weapon System ◽  
Impact Process ◽  
Concept Model ◽  
Optimization Control ◽  
And Control ◽  
The Impact

The basic composing and functions of underwater autonomous weapon system are analyzed in the paper. With researching on the process of action, the concept model of underwater autonomous weapon system is built up. The impact control method is deeply analyzed on the emphasis, and the model of impact process is put forward. The results of numerical simulation indicate that the impact process model and control method are effectual which can provide reliable theory for farther research on optimization control of system.

scholarly journals The Impact of Stress Stability on Job Satisfaction and the Quality of Human Capital

2017 ◽  
Vol 6 (5) ◽  
pp. 333 ◽  
Author(s):  
Irina A. Rudaleva ◽  
Askar N. Mustafin
Keyword(s):  
Job Satisfaction ◽  
Psychological State ◽  
Negative Consequences ◽  
Professional Stress ◽  
Time Period ◽  
Bank Employees ◽  
Short Time ◽  
The Impact ◽  
Main Factor

<p>Long professional stress has a significant impact on the psychological state of employees that inevitably affects the activities of any organization. Therefore, at present, more and more attention is being paid to minimize the negative consequences of stressful staff conditions, with the help of specific procedures of stress management. In this paper, we investigated the impact of stress, the types of stress-resistance of staff individual, and the influence of stress on the degree of job satisfaction of bank employees. The study concludes that the following factors affect the level of job satisfaction of bank employees: wage satisfaction, the level of stress at the workplace, and the relationships in the team. The main factor of the bank employees stress is a large amount of work and a short time period for doing the work. </p>

scholarly journals Topics, Trends, and Sentiments of Tweets About the COVID-19 Pandemic: Temporal Infoveillance Study

10.2196/22624 ◽  
2020 ◽  
Vol 22 (10) ◽  
pp. e22624 ◽  
Author(s):  
Ranganathan Chandrasekaran ◽  
Vikalp Mehta ◽  
Tejali Valkunde ◽  
Evangelos Moustakas
Keyword(s):  
Health Care ◽  
English Language ◽  
Latent Dirichlet Allocation ◽  
Data Sets ◽  
Data Set ◽  
Time Period ◽  
Combining Data ◽  
Social Media Platforms ◽  
And Control ◽  
The Impact

Background With restrictions on movement and stay-at-home orders in place due to the COVID-19 pandemic, social media platforms such as Twitter have become an outlet for users to express their concerns, opinions, and feelings about the pandemic. Individuals, health agencies, and governments are using Twitter to communicate about COVID-19. Objective The aims of this study were to examine key themes and topics of English-language COVID-19–related tweets posted by individuals and to explore the trends and variations in how the COVID-19–related tweets, key topics, and associated sentiments changed over a period of time from before to after the disease was declared a pandemic. Methods Building on the emergent stream of studies examining COVID-19–related tweets in English, we performed a temporal assessment covering the time period from January 1 to May 9, 2020, and examined variations in tweet topics and sentiment scores to uncover key trends. Combining data from two publicly available COVID-19 tweet data sets with those obtained in our own search, we compiled a data set of 13.9 million English-language COVID-19–related tweets posted by individuals. We use guided latent Dirichlet allocation (LDA) to infer themes and topics underlying the tweets, and we used VADER (Valence Aware Dictionary and sEntiment Reasoner) sentiment analysis to compute sentiment scores and examine weekly trends for 17 weeks. Results Topic modeling yielded 26 topics, which were grouped into 10 broader themes underlying the COVID-19–related tweets. Of the 13,937,906 examined tweets, 2,858,316 (20.51%) were about the impact of COVID-19 on the economy and markets, followed by spread and growth in cases (2,154,065, 15.45%), treatment and recovery (1,831,339, 13.14%), impact on the health care sector (1,588,499, 11.40%), and governments response (1,559,591, 11.19%). Average compound sentiment scores were found to be negative throughout the examined time period for the topics of spread and growth of cases, symptoms, racism, source of the outbreak, and political impact of COVID-19. In contrast, we saw a reversal of sentiments from negative to positive for prevention, impact on the economy and markets, government response, impact on the health care industry, and treatment and recovery. Conclusions Identification of dominant themes, topics, sentiments, and changing trends in tweets about the COVID-19 pandemic can help governments, health care agencies, and policy makers frame appropriate responses to prevent and control the spread of the pandemic.

scholarly journals Lutzomyia longipalpis behavior and control at an urban visceral leishmaniasis focus in Argentina

2010 ◽  
Vol 52 (4) ◽  
pp. 187-191 ◽  
Author(s):  
Maria Soledad Santini ◽  
Oscar Daniel Salomón ◽  
Soraya Alejandra Acardi ◽  
Enrique Adolfo Sandoval ◽  
Lilian Tartaglino
Keyword(s):  
Visceral Leishmaniasis ◽  
Sand Fly ◽  
Bed Nets ◽  
Lutzomyia Longipalpis ◽  
Post Intervention ◽  
Protection Measures ◽  
Time Space ◽  
Local Officials ◽  
And Control ◽  
The Impact

During the earlier stages of visceral leishmaniasis transmission in Posadas City, Misiones, both the night activity and attraction to humans of Lutzomyia longipalpis were assessed, in order to provide preliminary recommendations. The impact of peridomestic deltamethrin spraying performed by local officials was also evaluated. Although Lu. longipalpis were found in traps located over a dog the entire night, 90% of the females were captured from 20.30h to 1.30h, and only landed on a human when he was at a distance of 1.5 m from the dog. Peridomestic spraying of deltamethrin (25 mg/m²) reduced the sand fly capture up to seven days post-intervention without dispersion in the border of the sprayed areas. These results support the recommendations about time-space focus of the protection measures: first half of the night, in the backyard, with pets and domestic animals kept at least 5 m from humans. The deltamethrin as it was used did not seem very effective in this scenario; neither did the eventual use of bed nets, at least in adults, due to the place/hour of sand fly higher activity. This study strengthens the need for a multidisciplinary approach to develop prevention strategies based both on biological and anthropological studies.

The Impact of Regionalization of Pancreaticoduodenectomy for Pancreatic Cancer in North Carolina since 2004

2014 ◽  
Vol 80 (6) ◽  
pp. 561-566 ◽  
Author(s):  
Ryan Z. Swan ◽  
David J. Niemeyer ◽  
Ramanathan M. Seshadri ◽  
Kyle J. Thompson ◽  
Amanda Walters ◽  
...  
Keyword(s):  
North Carolina ◽  
Significant Risk ◽  
High Volume ◽  
Major Morbidity ◽  
The North ◽  
Time Period ◽  
Improved Outcomes ◽  
Before And After ◽  
Low Volume ◽  
The Impact

Pancreaticoduodenectomy (PD) carries a significant risk. High-volume centers (HVCs) provide improved outcomes and regionalization is advocated. Rapid regionalization could, however, have detrimental effects. North Carolina has multiple HVCs, including an additional HVC added in late 2006. We investigated regionalization of PD and its effects before, and after, the establishment of this fourth HVC. The North Carolina Hospital Discharge Database was queried for all PDs performed during 2004 to 2006 and 2007 to 2009. Hospitals were categorized by PD volume as: low (one to nine/year), medium (10 to 19/year), and high (20/year or more). Mortality and major morbidity was assessed by comparing volume groups across time periods. Number of PDs for cancer increased 91 per cent (129 to 246 cases) at HVCs, whereas decreasing at low-volume (62 to 58 cases) and medium-volume (80 to 46 cases) centers. Percentage of PD for cancer performed at HVCs increased significantly (47.6 to 70.3%) while decreasing for low- and medium-volume centers ( P < 0.001). Mortality was significantly less at HVCs (2.8%) compared with low-volume centers (10.3%) for 2007 to 2009. Odds ratio for mortality was significantly lower at HVCs during 2004 to 2006 (0.31) and 2007 to 2009 (0.34). Mortality for PD performed for cancer decreased from 6.6 to 4.6 per cent ( P = 0.31). Major morbidity was not significantly different between groups within either time period; however, there was a significant increase in major morbidity at low-volume centers ( P = 0.018). Regionalization of PD for cancer is occurring in North Carolina. Mortality was significantly lower at HVCs, and rapid regionalization has not detracted from the superior outcomes at HVCs.

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