An optimal Fuzzy-logic based frequency control strategy in a high wind penetrated power system     

Ahmadreza Abazari  Mehdi Ghazavi Dozein  Hassan Monsef 《Journal of The Franklin Institute》2018,355(14):6262-6285

This paper introduces a new load frequency control (LFC) model in the presence of high wind power penetration level. The main issue in a wind-penetrated power system is to maintain the system frequency in a normal operating band which is specified by the given system grid codes. Essentially, the power system equilibrium point changes following a contingency, and in this case, the high penetration of wind farms makes it harder to regain an acceptable system equilibrium points through conventional control applications. In order to overcome the aforesaid problem, a new Fuzzy-logic controller is designed optimally in this paper using the artificial bee colony (ABC) algorithm. In this approach, the ABC algorithm tunes the membership function parameters of the Fuzzy controller to acquire a good-enough performace of the proposed strategy. More importantly, the proposed Fuzzy-logic controller is blessed with robustness, simplicity, and reliability in order to ameliorate the frequency deviation. It is worth saying that the stability analysis is presented in this paper as well as the noise analysis of the proposed method. The research results indicates how effectively wind farm could participate in the system frequency control through inertial control, primary frequency control, and supplementary frequency control.  相似文献   

Soluble Tumor Necrosis Factor Like Weak Inducer of Apoptosis and Vitamin D in Hemodialysis Patients: Relation to Carotid Intima-Media Thickness     

Farahnaz Askarian  Amir Ghorbanihaghjo  Hassan Argani  Davoud Sanajou  Nima Nasehi  Roya Askarian  Ravan Ahmadi  Nadereh Rahtchizadeh 《Indian journal of clinical biochemistry : IJCB》2018,33(3):297-303

Cardiovascular disease, as the leading cause of patient death with chronic kidney disease, could be predicted by carotid atherosclerosis. The aim of the present study was to evaluate a possible relationship between serum soluble tumor necrosis factor-like weak inducer of apoptosis (sTWEAK) and Vitamin D levels with mean right/left carotid intima-media thickness (cIMT), in the hemodialysis (HD) patients. In this cross-sectional study, serums were obtained from 50 stable chronic HD patients and 39 healthy controls. The serum levels of sTWEAK, Vitamin D, intact parathyroid hormone (iPTH) in both groups, and cIMT were determined in HD patients by standard methods. Serum levels of sTWEAK were higher [808.8 (521.6–5032.4) pg/ml vs. 664.4 (487.4–2955.8) pg/ml (p = 0.006)] and Vitamin D levels were lower [13.4 (2.5–153) ng/ml vs. 27.8 (18.4–59.0) ng/ml (p = 0.001)] in the hemodialysis patients than in the healthy control. No important correlation was found between sTWEAK Vitamin D levels (r = 0.010/p = 0.946), and mean right(r = ?0.194/p = 0.178) and left (r = 0.061/p = 0.673) cIMT in the HD patients. Our study shows that sTWEAK levels are elevated in HD patients. This elevation has no association with the cIMT.  相似文献   

Early detection of prostate cancer: evaluating the diagnostic performance of prostate specific antigen by comparing with histological technique among africans     

Emokpae  M. A.  Das  S. C.  Orok  T.  Mohammed  A. Z.  Hassan  S. A. 《Indian journal of clinical biochemistry : IJCB》2004,19(1):62-66

This study was conducted to investigate the diagnostic performance characteristics of prostate specific antigen (PSA) by comparing serum PSA value with histological findings in patients suspevted of having prostate cancer in Aminu Kano Teaching Hospital. Nigeria. Clinical and Laboratory records were examined and collated for serum PSA values, together with histological findings of biopsy specimen, clinical diagnosis, age of patients, and mode of presentation. The serum PSA values were determined by ELECSYS 1010 autoanalysers Roche, Germany based on electrochemiluminescence immunoassay technique. The results show that serum PSA values increase with age in the assymptomatic non-cancer patients who came for medical check up but were within normal limit. In prostatic disease conditions PSA values were raised in benign prostatic hyperplasia 35.957± 4.0315ng/ml, in undifferentiated carcinoma 56.22±4.295ng/ml and adenocarcinoma >100ng/ml as compared to the normal range (0–4ng/ml). These cases were confirmed by histological diagnosis. It is concluded that PSA evaluations is a sensitive marker for prostate cancer but because of various other conditions that affect serum PSA concentration, other methods of investigations such as Digital Rectal examination, Trans Urethral Ultra-Sonography and histological examination should be combined to confirm diagnosis. Prognosis of patients will be better if early diagnosis is made.  相似文献   

Evaluation of tactical training in team handball by means of artificial neural networks     

Amr Hassan  Norbert Schrapf  Wael Ramadan  Markus Tilp 《Journal of sports sciences》2017,35(7):642-647

While tactical performance in competition has been analysed extensively, the assessment of training processes of tactical behaviour has rather been neglected in the literature. Therefore, the purpose of this study is to provide a methodology to assess the acquisition and implementation of offensive tactical behaviour in team handball. The use of game analysis software combined with an artificial neural network (ANN) software enabled identifying tactical target patterns from high level junior players based on their positions during offensive actions. These patterns were then trained by an amateur junior handball team (n = 14, 17 (0.5) years)). Following 6 weeks of tactical training an exhibition game was performed where the players were advised to use the target patterns as often as possible. Subsequently, the position data of the game was analysed with an ANN. The test revealed that 58% of the played patterns could be related to the trained target patterns. The similarity between executed patterns and target patterns was assessed by calculating the mean distance between key positions of the players in the game and the target pattern which was 0.49 (0.20) m. In summary, the presented method appears to be a valid instrument to assess tactical training.  相似文献   

Still as divided as ever? Northern Ireland,football and identity 20 years after the Good Friday Agreement     

David Hassan  Kyle Ferguson 《Soccer & Society》2019,20(7-8):1071-1083

ABSTRACT

The signing of the Belfast-Good Friday Agreement in 1998 was widely welcomed by those that interpreted it as offering Northern Ireland the prospect of a fresh start, free from inter-ethnic violence that had blighted the country for almost 80 years. Soon it began to be seen by some observers as the genesis too of a ‘Northern Irish’ identity, as the community at large came to reconcile themselves to their common lives in Northern Ireland. Sport was also viewed as offering the prospect of adding weight to this sense of a shared journey and governing bodies of sport unquestionably played their parts in supporting a settled political environment where division had previously existed. This article examines the still contested concept of a ‘Northern Irish’ identity and critically reviews its real currency in a divided society, even if sport and, specifically, association football offers renewed hope for something better in the time ahead.  相似文献   

Sports tourism does not have to be accompanied by crime: a case for the NFL Super Bowl     

Hassan Tajalli  Alejandra Iraide Peña 《Journal of Sport Tourism》2017,21(1):15-32

The Routine Activities Theory suggests that when there is the presence of a motivated offender, a suitable target, and the absence of a capable guardian, crime has the opportunity to occur. Large sporting events accompanied by massive tourists bring these ingredients of crime together. The purpose of this study is to find out whether the crime rates spike in the host cities during the high tourist month of the Super Bowl. Twenty-four months of crime rates on eight types of crimes were obtained for every American city that has hosted the Super Bowl. Panel Data Analysis is used to test the Hypotheses of this study. The findings do not show a spike in crime rates during the month of Super Bowl for any of the crimes examined in this study. It is in the economic interests of all stakeholders to provide a safe and secure venue free of crimes for sports tourists.  相似文献   

Convergence Between Platforms in the Newsroom     

Mohamed Morsy Hassan 《Journalism Practice》2019,13(4):476-492

Through ethnographic observation and content analysis, this study aims to classify the Al-Jazeera Mubasher (AJM) newsroom according to the Schantin model of newsrooms, describe the network’s convergence level based on the Dailey, Demo, and Spillman Dynamic Scale Model, and present a unique model elucidating how, specifically, convergence works at AJM. Based on the Schantin model of newsrooms, AJM can be classified as a second-generation newsroom, a “cross-media platforms newsroom.” Convergence among the different platforms of AJM is considerable, but still below full convergence level. Accordingly, the AJM newsroom can be classified into the fourth level of the Dailey et al. Dynamic Scale Model — “content sharing.” The unique AJM-specific model presented near the end of this paper depicts the ways in which different AJM platforms function and interact inside the newsroom, explains the degree of convergence between platforms, and classifies the newsroom in terms of its convergence level.  相似文献   

Utilization of discrete transforms to conquer the problems of multi-tone systems     

Samir Abd Elghafar  Salaheldin M. Diab  Bassiouny M. Sallam  Emad S. Hassan  Mona Shokair  Waleed Al-Nauimy  Moawad I. Dessouky  El-Sayed M. El-Rabaie  Saleh Alshebeili  Fathi E. Abd El-Samie 《Journal of The Franklin Institute》2014

This paper presents a new implementation of discrete multi-tone (DMT) systems based on different discrete transforms that include the discrete sine transform (DST), discrete cosine transform (DCT), and discrete wavelet transform (DWT). The implementation also considers time-domain equalization to mitigate channel distortion. Compared to the fast Fourier transform discrete multi-tone (FFT-DMT) system, the proposed implementations have an advantage in that their energy-compaction property helps in reducing the channel effects. The performance of the DST-DMT, DCT-DMT, DWT-DMT, and FFT-DMT systems, employing a time-domain equalizer (TEQ), is investigated in the paper. It has been demonstrated by computer simulations that the proposed implementations outperform the FFT-DMT system and that the utilization of the TEQ can lead to higher bit rates  相似文献   

Measuring attitude towards learning science in Malaysian secondary school context: implications for teaching     

Sharifah Sariah Syed Hassan 《International Journal of Science Education》2013,35(16):2044-2059

ABSTRACT

The aim of education is to ensure a holistic development towards knowledge and well-being. Despite exhaustive effort on embedding twenty-first century skills in science teaching, students show lack of interest to learn and pursue their science careers. This present study has attempted to develop an instrument for measuring attitude towards science learning. The purpose was to ensure valid items were identified to measure all aspects of attitude namely affect, behaviour and cognitive. The study of attitude in science will determine the direction on how teaching strategies can be successful in promoting interest in learning. The study has been underpinned from the theories related to Theory of Reasoned Action, Constructivist learning and Connectivism. Samples from three secondary schools were selected based on proportionate stratified random sampling. 350 samples were targeted to respond to self-constructed questionnaires. Confirmatory Factor Analysis (CFA) was employed to prove the hypothesised 5-factor measurement model. The results have supported a model fit with positive interactions between the factors are evident. The study has proven the theoretical contributions which embark on holistic development of an individual to ensure attitude is moulded. The emotional and spiritual aspects of learning are needed to ensure positive contribution to the social dynamic. In this paper, the discussions are elaborated from the standpoints of theories and practical importance. The results have contributed to a theoretical model of science teaching method.  相似文献   

Search systems and their features: What college students use to find and save information     

Jingjing Liu  Hassan Zamir  Yuan Li  Samantha K. Hastings 《Library & information science research》2018,40(2):118-124

College students have often been surveyed about their general information seeking behaviors. However, little has been done to explore what specific system features they use to find and save information when they are working on their real-life tasks. In this study, 32 college students were invited to an information interaction lab for a session in which they recalled a recently finished task and worked on a to-be-finished task using a computer in the lab. They were asked to complete questionnaires regarding what systems they used to finish their tasks and what features were helpful for searching and for saving information. Results showed that college students rely more heavily on the Internet sources than on library sources, even for their course related work. The study identified fourteen categories of system features helpful for information search and eight categories helpful for information saving. The findings have implications for designing systems that will better help people accomplish their tasks.  相似文献