scholarly journals The Impacts of Emergency Vehicle Signal Preemption on Urban Traffic Speed

2012 ◽  
Vol 49 (1) ◽  
Author(s):  
Hualiang (Harry) Teng ◽  
Valerian Kwigizile ◽  
Gang Xie ◽  
Mohamed Kaseko ◽  
A. Reed Gibby
Keyword(s):  
Opposite Direction ◽  
Negative Impact ◽  
Urban Traffic ◽  
Transition Time ◽  
Gps Data ◽  
Emergency Vehicle ◽  
Emergency Vehicles ◽  
Significant Negative Impact ◽  
The Mean ◽  
The Impact

We used GPS data from paratransit vehicles to evaluate the impact of emergency vehicles on urban traffic speeds. The results indicate that speed variance is significantly higher during emergency preemption and the mean speeds of traffic flowing in the same direction as the emergency vehicle and on crossing streets are lower during preemption than during normal conditions. Regression results indicate that traffic on major arterials and traffic in the opposite direction of the emergency vehicle tend to have higher speed during signal preemption. Signal preemption during peak periods and duration of preemption had a significant negative impact on traffic speeds. Also, the transition time has a negative impact on traffic speeds. The authors recommend further research on how to optimize (minimize) the preemption duration as well as transition time. Also, the impact of median type and number of lanes should be evaluated.

scholarly journals The Influence of Urban Sprawl on Air Pollution and the Mediating Effect of Vehicle Ownership

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1261
Author(s):  
Aiping Tao ◽  
Qun Liang ◽  
Peng Kuai ◽  
Tao Ding
Keyword(s):  
Air Pollution ◽  
Urban Sprawl ◽  
Negative Impact ◽  
Empirical Support ◽  
Mediating Effect ◽  
Vehicle Ownership ◽  
Mediating Role ◽  
Effect Model ◽  
Significant Negative Impact ◽  
The Impact

Based on the panel data of 224 prefecture-level and above cities in China from 2003 to 2016, this paper empirically studies the impact of urban sprawl on air pollution and introduces a mediating effect model to test the mediating role of vehicle ownership concerning the impact of urban sprawl on air pollution. The research in this paper arrives at three conclusions. First, urban sprawl has a significant positive effect on air pollution, and this conclusion is still valid after solving the endogeneity problem and conducting a robustness test. Second, the results of mediating effect test show that urban sprawl indirectly affects air pollution through the partial mediating effect of vehicle ownership. By removing the mediating effect, urban sprawl has a significant negative impact on air pollution, indicating that the mediating effect of vehicle ownership is higher concerning the impact of urban sprawl on air pollution. Third, further panel quantile regression results show that the higher the level of air pollution, the weaker the mediating effect of vehicle ownership and the stronger the direct effect of urban sprawl on air pollution. These conclusions can provide some empirical support for solving the air pollution problems caused by urban sprawl in China.

The Impact of the Business Environment on the Formalization of Informal Firms. The Case of Kosovo

Südosteuropa ◽  
2020 ◽  
Vol 68 (4) ◽  
pp. 505-529
Author(s):  
Kujtim Zylfijaj ◽  
Dimitar Nikoloski ◽  
Nadine Tournois
Keyword(s):  
Negative Impact ◽  
Positive Impact ◽  
Business Environment ◽  
Positive Influence ◽  
Policy Implications ◽  
Tax Reforms ◽  
Firm Level ◽  
Characteristics Analysis ◽  
Significant Negative Impact ◽  
The Impact

AbstractThe research presented here investigates the impact of the business environment on the formalization of informal firms, using firm-level data for 243 informal firms in Kosovo. The findings indicate that business-environment variables such as limited access to financing, the cost of financing, the unavailability of subsidies, tax rates, and corruption have a significant negative impact on the formalization of informal firms. In addition, firm-level characteristics analysis suggests that the age of the firm also exercises a significant negative impact, whereas sales volume exerts a significant positive impact on the formalization of informal firms. These findings have important policy implications and suggest that the abolition of barriers preventing access to financing, as well as tax reforms and a consistent struggle against corruption may have a positive influence on the formalization of informal firms. On the other hand, firm owners should consider formalization to be a means to help them have greater opportunities for survival and growth.

scholarly journals POS0998 SPONDYLOARTHRITIS AND SLEEP DISORDERS

2021 ◽  
Vol 80 (Suppl 1) ◽  
pp. 767.2-768
Author(s):  
S. Lahrichi ◽  
K. Nassar ◽  
S. Janani
Keyword(s):  
Functional Impairment ◽  
Sleep Disturbances ◽  
Negative Impact ◽  
University Hospital ◽  
Quality Of Sleep ◽  
The Mean ◽  
Sleep Deficit ◽  
Impaired Sleep ◽  
The Impact

Background:Spondyloarthropathies (SpA) are a group of chronic and progressive diseases, characterized in particular by a progressive stiffening of the spine, spreading to neighboring joints or to certain tissues, which could lead in the long term to progressive stiffening and functional impairment. This conditioncancauseinsomnia problems and impaired sleep quality.Objectives:To assess the impact of SpA on the quality of sleep.Methods:This is a retrospective study over a period of 4 years from January 2015 to December 2019, including all the medical records of patients with SpA followed in the Department of Rheumatology of the University Hospital of Ibn Rochd, Casablanca. We evaluated for each patient two validated scores: the Epworth somnolence scale rated from 0 to 24, and the Pittsburgh sleep score rated from 0 to 21 with 7 components. Patients with a psychiatric history or who were followed up for neurological pathologies were excluded.Results:178 patients were included. 60.67% were men with an average age of 36.32 years (14-68 years). 45.01% had axial SpA, 29.77% had psoriatic arthritis, and 25.22% were followed for SpA associated with inflammatory bowel disease. 45% had associated comorbidities: there were 18 diabetics and 34 hypertensive, 16.58% were smokers. Clinically, 85.42% presented a back pain initially on examination, 55% presented a polyarthralgia, and 39.88% an oligoarthritis. 63% had radiological sacroiliitis, and 35.14% had bilateral coxitis. 13.48% had a positive HLA B27 and 58.89% had a positive inflammatory assessment with very high activity indices,with a mean of 4.6. 64.66% of the patients received NSAIDs,of which 11% responded well. 57% were treated with csDMARDs, and 17.86% were treated with biologics. At the time of our study, the mean visual analog scale was 5.84 ± 1.7 out of 10 (2-9). The mean Epworth score was 8.38 ± 5.2 (0-21). 56.1% of patients had no sleep debt, 33.3% had a sleep deficit, and only 10.6% had signs of drowsiness. For the overall Pittsburgh score, the mean was 7.02 ± 3.6 (1-18). The mean of “subjective quality of sleep” was 1.12, “sleep latency” was 1.22, “duration of sleep” was 1.06, “usual sleep efficiency” was 0.74, “Sleep disturbance” of 1.28, “use of a sleep medication” of 0.54, and the average of the component concerning “poor shape during the day” was 1.03 out of 3. The LEQUESNE index went from an average of 6 to 8, which corresponds to an average handicap (P = 0.2) over a period of 3 years. 68% of the patients had an alteration in the quality of sleep, starting on average three years after the onset of symptoms. 11% reported having experiencedanxiety and depressive symptoms, and reported having used antidepressants or anxiolytics in the past 5 years.Conclusion:Our study showed the negative impact of SpA on the duration and overall quality of sleep. The degree of pain as well as functional impairment can cause and worsen sleep disturbances in SpA. We have shown that the Pittsburg score increases significantly with the increase of pain.The Lequesne score and that the Epworth score increase with disease activity[1].References:[1]StolwijkC,vanTubergenA,Castillo-OrtizJD,BoonenA.Prevalenceofextra-articularmanifestationsinpatientswithankylosingspondylitis:asystematicreviewandmeta-analysis.AnnRheumDis2015;74:65—73.Disclosure of Interests:None declared.

Three strikes and you are out?

2017 ◽  
Vol 10 (4) ◽  
pp. 417-429 ◽  
Author(s):  
Michael Carriger
Keyword(s):  
Negative Impact ◽  
Univariate Analysis ◽  
Market Valuation ◽  
Financial Health ◽  
Content Type ◽  
Financial Measures ◽  
Significant Negative Impact ◽  
Three Strikes ◽  
Underlying Disorder ◽  
The Impact

Purpose Much has been written in both the management and finance literatures about the impact of downsizing on the financial health and market valuation of companies. However, surprisingly little attention has been paid to the frequency of downsizing and the impact of frequent downsizings. The purpose of this paper is to look at trends in downsizing, asking the question are companies that downsize once more likely to downsize again. The paper also looks at the impact of frequent downsizing, asking the question are frequent downsizers differentially impacted compared to less frequent downsizers. Design/methodology/approach Companies that appeared on the Fortune 500 in 2014 and were also on the list in 2008 were assessed for the impact of repeat downsizings on financial measures (profitability, efficiency, debt, and revenue) and market valuation. A trend analysis was conducted to assess the trend in downsizing and repeated downsizing from 2008 through 2014. A series of univariate analysis of variances were conducted to assess the impact of repeated downsizings on the financial and market valuation indicators. Findings Findings indicate that companies that downsize between 2008 and 2009 were more likely to downsize again in future years. And this repeat downsizing happened at a higher rate than would be expected by the percentage of companies that initially downsized. Findings also indicate that multiple downsizings had a significantly negative impact on the company’s financial performance as measured by two profitability ratios (return on assets and return on investment) and a borderline significant negative impact on the company’s market valuation as measured by stock equity, regardless of industry or initial financial health of the company. Originality/value Two competing theories were considered and the evidence found here support both. However, the “band-aid solution” theory, that downsizing may function as a band-aid addressing the symptoms that lead to the downsizing but not the underlying disorder or cause may be a more parsimonious explanation for the results here. It is hoped that these findings will inform both scholars and practitioners, giving both a clearer picture of the impact of multiple downsizings on corporate performance.

Fatigue Assessment of Mooring Chain Considering the Effects Of Mean Load and Corrosion

2021 ◽  
Author(s):  
Erling N. Lone ◽  
Thomas Sauder ◽  
Kjell Larsen ◽  
Bernt J. Leira
Keyword(s):  
Negative Impact ◽  
Fatigue Tests ◽  
Design Practice ◽  
Extended Formulation ◽  
Considerable Influence ◽  
Corrosion Condition ◽  
Capacity Model ◽  
Significant Negative Impact ◽  
The Mean ◽  
Mooring Chain

Abstract Results from full scale fatigue tests of offshore mooring chains performed in recent years have revealed considerable influence of both mean load and corrosion condition on the fatigue capacity. It has been shown that a reduction of the mean load gives an increase in fatigue life, whereas the corrosion experienced by used chains have a significant negative impact. Neither of these effects are properly addressed by current S-N design curves or design practice. This paper suggests an extended S-N curve formulation, that includes the effects of mean load and corrosion condition. The parameters of the extended formulation are estimated empirically from mooring chain test data that includes new and used chains, with various mean loads and with different degrees of corrosion. The fitted capacity model is then used for fatigue calculation for the mooring system of a semi-submersible, showing the importance of using realistic mean loads and mooring chain corrosion in fatigue assessments.

IMPACT OF FACEBOOK ADDICTION DISORDER (FAD) ON STUDY HABITS AND ACADEMIC ACHIEVEMENT OF ADOLESCENTS

2021 ◽  
pp. 195-207
Author(s):  
Shivani Vashishtha ◽  
Sona Ahuja ◽  
Mani Sharma
Keyword(s):  
Academic Achievement ◽  
Social Networking Sites ◽  
Negative Impact ◽  
Age Groups ◽  
Negative Influence ◽  
Study Habits ◽  
Study Habit ◽  
Significant Negative Impact ◽  
Facebook Addiction ◽  
The Impact

With the present era being technology driven, social media has become an indispensable part of many people irrespective of their age. Among different age groups, the maximum users are adolescents and among different social networking sites (SNS), Facebook shares the major part of usage by them. Many adolescents are tending towards excessive usage of Facebook leading to its addiction. Does this addiction have negative influence on adolescents or it actually helps them to keep up with their counterparts and be socially connected to them for their betterment? This question is unanswered specifically when it concerns the impact that it has on the study habits and academic achievement of adolescents. The hypotheses were tested in order to explore the impact of six dimensions (mood modification, deficient self-regulations, salience, loss of control, withdrawal, and relapse) of Facebook Addiction Disorder (FAD) using Bergens' Facebook Addiction Scale (BFAS), developed by Andreassen (2012). The results are based on the survey conducted on 200 adolescents studying in different schools of India. The findings indicate that there is a significant negative impact of Facebook Addiction Disorder (FAD) on study habits and academic achievement of adolescents. The major implication derived is that the higher the addiction to Facebook the study habit become poor and academic achievement decreases resulting in lower grades.

scholarly journals Taxing impact of terrorism on global economic openness of developed and developing countries

2018 ◽  
Vol 68 (3) ◽  
pp. 311-335
Author(s):  
Abubakr Saeed ◽  
Yuhua Ding ◽  
Shawkat Hammoudeh ◽  
Ishtiaq Ahmad
Keyword(s):  
Developing Countries ◽  
Negative Impact ◽  
Developed Countries ◽  
Terrorist Attacks ◽  
Economic Openness ◽  
Significant Negative Impact ◽  
Military Expenditures ◽  
The Developed Countries ◽  
The Impact ◽  
The Relationship

This study examines the relationship between terrorism and economic openness that takes into account both the number and intensity of terrorist incidents and the impact of government military expenditures on trade-GDP and foreign direct investment-GDP ratios for both developed and developing countries. It uses the dynamic GMM method to account for endogeneity in the variables. Deaths caused by terrorism have a significant negative impact on FDI flows, and the number of terrorist attacks is also found to be significant in hampering the countries’ ability to trade with other nations. The study also demonstrates that the developing countries exhibit almost similar results to our main analysis. The developed countries exhibit a negative impact of terrorism, but the regression results are not significant.

scholarly journals Signal Preemption Control of Emergency Vehicles Based on Timed Colored Petri Nets

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Haibo Mu ◽  
Linzhong Liu ◽  
Xiaojing Li
Keyword(s):  
Petri Nets ◽  
Control Strategies ◽  
Traffic Signal ◽  
Urban Traffic ◽  
Colored Petri Nets ◽  
Current Phase ◽  
Emergency Vehicle ◽  
Phase Switching ◽  
Emergency Vehicles ◽  
Timed Colored Petri Nets

This paper focuses on the use of timed colored Petri nets (TCPN) to study emergency vehicle (EV) preemption control problem. TCPN is adopted to establish an urban traffic network model composed of three submodels, namely, traffic flow model, traffic signal display and phase switch model, and traffic signal switch control model. An EV preemption optimization control system, consisting of monitoring subsystem, phase time determination subsystem, and phase switching control subsystem, is designed. The calculation method of the travelling speed of EV on road sections is presented, and the methods of determining the actual green time of current phase and the other phase are given. Some computational comparisons are performed to verify the signal preemption control strategies, and simulation results indicate that the proposed approach can provide efficient and safe running environments for emergency vehicles and minimize EV’s interference to social vehicles simultaneously.

scholarly journals Nature of Academic Programs, Epistemological Beliefs and Their Impact on Pakistani University Students’ Academic Performance

2021 ◽  
Vol 4 (4) ◽  
pp. 781-803
Author(s):  
Rafaquat Ali ◽  
Bushra Shoukat ◽  
Rabia Bahoo
Keyword(s):  
Academic Performance ◽  
University Students ◽  
Epistemological Beliefs ◽  
Negative Impact ◽  
English Literature ◽  
Academic Programs ◽  
Physical Sciences ◽  
Field Of Study ◽  
Significant Negative Impact ◽  
The Impact

The students’ academic behaviours and academic performance differ with their epistemological beliefs. Different social-cultural and educational contexts inculcate differences in students’ epistemological beliefs. However, the impact of the nature of the academic programs on students’ epistemological beliefs is most obvious. The students of different disciplines can have different epistemological beliefs. These different epistemological beliefs differ in their impact on students’ academic performance and academic behaviour. Hence, the current study evaluated the interrelationships of various educational programs and epistemological beliefs and their importance in students’ academic performance. The volunteer university students provided data about their academic programs, epistemological beliefs, and academic performance. Researchers used the Generalized Structured Component Analysis approach to calculate the suitability of specified measurement and structural models. The impact of subjects of the soft field of study such as Behavioural Sciences, English Literature was negative on naive epistemological beliefs in knowledge structure and omniscient authority compared to subjects of the hard field of studies such as Mathematical, Physical Sciences, and Biological Sciences. The Business Sciences from the soft applied field of study had the least noticeable negative impact on naive epistemological beliefs compared to other subjects of pure soft and pure hard field of studies. Only, the belief in quick learning had a significant negative impact on students’ academic performance.

scholarly journals Dampak Faktor Eksternal dan Faktor Internal terhadap Perkembangan Bank Umum Syariah di Indonesia

2020 ◽  
Vol 1 (1) ◽  
pp. 97-108
Author(s):  
Luthfiah Nurazlina ◽  
Hasbi Assidiki Mauluddi
Keyword(s):  
Negative Impact ◽  
External Factors ◽  
Islamic Banks ◽  
Internal Factors ◽  
Simultaneous Test ◽  
Panel Data Regression ◽  
Data Regression ◽  
Simultaneous Testing ◽  
Significant Negative Impact ◽  
The Impact

The goal of this study was to determine the impact to which external factors such as GDP growth, inflation and BI interest rate and internal factors such as CAR, FDR and NPF have had an influence on the development of Islamic Banks in Indonesia that represented by the growth of total assets Islamic banks in Indonesia from 2015-2019. This research used a quantitative approach and the data would be analyzed using multiple regression test through panel data regression with partial test and simultaneous test provided by Eviews 10. Considering the results of the simultaneous testing, the study suggests that all variables had an impact on the development of the Islamic Bank. As for the partial test, from the external factors only the BI rate which gives a significant negative impact on the development of Islamic banks and from internal factors there are NPF and FDR which give significant negative impact. It was concluded that GDP, Inflation, and CAR did not affect the development of Islamic Banks in Indonesia.

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