Network-based synchronization of T–S fuzzy chaotic systems with asynchronous samplings     

Tae H. Lee  Chee Peng Lim  Saeid Nahavandi  Ju H. Park 《Journal of The Franklin Institute》2018,355(13):5736-5758

In this paper, we study the problem of network-based synchronization of chaotic systems in Takagi–Sugeno (T–S) fuzzy form, in which the master and slave fuzzy chaotic systems are connected with a continuous-time controller through a network. In all communication channels, asynchronous samplings and external disturbances are considered. The asynchronously sampled state information of the master and slave systems received in the controller is treated by designing an observer for estimating the states of the master system. Then, based on the observation result, the problem of asynchronous samplings between the slave-controller and controller-slave channels is solved in two different cases. Sufficient conditions for the existence of the desired observer and controllers for each asynchronous cases are presented in the form of linear matrix inequalities. An numerical example is given to illustrate the validity and potential of the proposed new design techniques.  相似文献   

The Singapore Football League, 1904–1941: Towards the Institutionalization of Football in the Colonial Port City of Singapore     

Lim Peng Han 《国际体育史杂志》2018,35(12-13):1217-1237

Abstract

The Singapore Football Association (SFA) was founded in 1892. In 1904, the YMCA initiated the first football league with 12 teams from military and European clubs and School Old Boys’ teams. The first phase from 1904 to 1913 was restricted to European and Eurasian only. The military teams won six out of the nine tournaments. The second phase of the league began in 1917 and from 1921 to 1941. The Straits Chinese Football Association (SCFA) took part in the league and the rejuvenated SFA included a representative from the SCFA. The Singapore Football League started with two divisions 1921 and participating teams from the SCFA in the same year and the Malaya Football Association (MFA) in 1924. The SCFA won the league for the first time in 1925 and subsequently in 1930, 1937, and 1938. In 1929, the SFA was renamed the Singapore Amateur Football Association (SAFA). The MFA won the League for the first time in 1931, and the first local team to win three years in succession from 1931 to 1933. From 1931 to 1941 the local teams won seven league titles out of 11. By 1940 the League grew with 44 teams in three divisions.  相似文献   

The effect of caffeine ingestion on human neutrophil oxidative burst responses following time-trial cycling     

Walker GJ  Dziubak A  Houghton L  Prendergast C  Lim L  Bishop NC 《Journal of sports sciences》2008,26(6):611-619

Following fixed-duration exercise of submaximal intensity, caffeine ingestion is associated with an attenuation of the exercise-induced decline in N-formyl-methionyl-phenyl-alanine (f-MLP) stimulated neutrophil oxidative burst. However, the response following high-intensity exhaustive exercise is unknown. Nine endurance-trained male cyclists ingested 6 mg caffeine or placebo per kilogram of body mass 60 min before cycling for 90 min at 70% of maximal oxygen consumption (VO2max) and then performing a time-trial requiring an energy expenditure equivalent to 30 min cycling at 70% maximum power output. Time-trial performance was 4% faster in the caffeine than in the placebo trial (P = 0.043). Caffeine was associated with an increased plasma adrenaline concentration after 90 min of exercise (P = 0.046) and immediately after the time-trial (P = 0.02). Caffeine was also associated with an increased serum caffeine concentration (P < 0.01) after 90 min of exercise and immediately after the time-trial, as well as 1 h after the time-trial. However, the f-MLP-stimulated neutrophil oxidative burst response fell after exercise in both trials (P = 0.002). There was no effect of caffeine on circulating leukocyte or neutrophil counts, but the lymphocyte count was significantly lower on caffeine (20%) after the time-trial (P = 0.003). Our results suggest that high-intensity exhaustive exercise negates the attenuation of the exercise-induced decrease in neutrophil oxidative burst responses previously observed when caffeine is ingested before exercise of fixed duration and intensity. This may be associated with the greater increase in adrenaline concentration observed in the present study.  相似文献   

Scan and Learn: Quick Response Code Enabled Museum for Mobile Learning of Anatomy and Pathology     

Sreenivasulu Reddy Mogali  Ranganath Vallabhajosyula  Chee Hon Ng  Darren Lim  Eng Tat Ang  Peter Abrahams 《Anatomical sciences education》2019,12(6):664-672

In the past, medical museums played a significant role in anatomy and pathology training. The attraction of medical museums has declined recently due to the emergence of information technology and innovative medical curricula. An innovative mobile learning platform has been developed using quick response (QR) codes for the museum specimens at the Lee Kong Chain School of Medicine, Singapore. High-quality images of the potted specimens were captured and combined into an album and a video using Adobe Acrobat Pro 9 and Windows Movie Maker, respectively. Subsequently, QR codes were generated linking to PDF documents with annotations, pathology, and clinical history concerning the specimens. Quick response codes were piloted in gastrointestinal teaching module for Year 2 medical students. Survey responses were obtained from students to verify the efficacy of QR as a learning tool. The majority of students either agreed or strongly agreed that it was easy to access the information about the specimen with QR codes (4.47 ± 0.84), while 96% of students agreed that they are able to correlate the specimen with the annotated images (4.56 ± 0.56). The majority of students (78%) agreed that QR codes are useful for their learning (4.22 ± 0.87), while 75% of students felt QR codes motivate them to visit Anatomy Resource Centre. Most of the students agreed that QR codes are useful for revision of materials (4.13 ± 1.07) and independent learning (4.38 ± 0.87). These findings suggest that QR codes are not only effective for students learning but also enhance their exploration experience with the museum specimens.  相似文献   

Free vibration of pre-tensioned nanobeams based on nonlocal stress theory     

C. W. LIM 《浙江大学学报(A卷英文版)》2010,11(1):34-42

The transverse free vibration of nanobeams subjected to an initial axial tension based on nonlocal stress theory is presented. It considers the effects of nonlocal stress field on the natural frequencies and vibration modes. The effects of a small scale parameter at molecular level unavailable in classical macro-beams are investigated for three different types of boundary conditions： simple supports, clamped supports and elastically-constrained supports. Analytical solutions for transverse deforma- tion and vibration modes are derived. Through numerical examples, effects of the dimensionless nanoscale parameter and pre-tension on natural frequencies are presented and discussed.  相似文献   

Relationships among organizational commitment, job satisfaction, and learning organization culture in one Korean private organization     

Taejo Lim 《Asia Pacific Education Review》2010,11(3):311-320

The purpose of this study is to identify dynamic relationships among organizational commitment, job satisfaction, and learning organization culture in a Korean private company. Using a sample of 669 employees from five subsidiaries of a Korean conglomerate, this research found that learning organization culture is moderately and positively related to job satisfaction. In addition, organizational commitment, except for continuance commitment, was found to be moderately and positively related to learning organization culture and job satisfaction. This research enables CEOs and HR practitioners to view organizational commitment, learning organization culture, and job satisfaction as important variables that can be applied in their management, interventions, and practices.  相似文献   

A microfluidics approach towards high-throughput pathogen removal from blood using margination     

Wei Hou H  Gan HY  Bhagat AA  Li LD  Lim CT  Han J 《Biomicrofluidics》2012,6(2):24115-2411513

Sepsis is an adverse systemic inflammatory response caused by microbial infection in blood. This paper reports a simple microfluidic approach for intrinsic, non-specific removal of both microbes and inflammatory cellular components (platelets and leukocytes) from whole blood, inspired by the invivo phenomenon of leukocyte margination. As blood flows through a narrow microchannel (20 × 20 µm), deformable red blood cells (RBCs) migrate axially to the channel centre, resulting in margination of other cell types (bacteria, platelets, and leukocytes) towards the channel sides. By using a simple cascaded channel design, the blood samples undergo a 2-stage bacteria removal in a single pass through the device, thereby allowing higher bacterial removal efficiency. As an application for sepsis treatment, we demonstrated separation of Escherichia coli and Saccharomyces cerevisiae spiked into whole blood, achieving high removal efficiencies of ∼80% and ∼90%, respectively. Inflammatory cellular components were also depleted by >80% in the filtered blood samples which could help to modulate the host inflammatory response and potentially serve as a blood cleansing method for sepsis treatment. The developed technique offers significant advantages including high throughput (∼1 ml/h per channel) and label-free separation which allows non-specific removal of any blood-borne pathogens (bacteria and fungi). The continuous processing and collection mode could potentially enable the return of filtered blood back to the patient directly, similar to a simple and complete dialysis circuit setup. Lastly, we designed and tested a larger filtration device consisting of 6 channels in parallel (∼6 ml/h) and obtained similar filtration performances. Further multiplexing is possible by increasing channel parallelization or device stacking to achieve higher throughput comparable to convectional blood dialysis systems used in clinical settings.  相似文献   

通过数学任务提高美国职前教师的数学成熟性     

Kien H.Lim  庞雅丽  赵锐 《数学教育学报》2009,18(3)

在美国,大多数学校讲授的数学是学校"数学",它与数学家所从事的数学有着本质的不同.为此要区分以下4种差异:(1)约定俗成的数学与学校数学之间的差异;(2)理解方式与思维方式之间的差异;(3)成熟的学习者与被动的学习者之间的差异;(4)知识传授与知识参与这两种教学模式之间的差异.根据Harcl的对偶原则来设计一个数学任务时,应该考虑学生已有的思维方式和理解方式,如激发学生学习某一特定概念的需要,促进理想的思维方式,阻止不合适的思维方式以及评估学生的概念性理解.  相似文献   

Historical consideration of place: inviting multiple histories and narratives in place-based education     

Miyoun Lim 《Cultural Studies of Science Education》2010,5(4):899-909

Drawing upon van Eijck and Roth’s notion of “place as chronotope,” this review paper discusses historical consideration of place as it assists us to conceptualize place in its collective, political, and dialogical nature. In a place, we are positioned amidst of the multiplicity of histories and narratives within ever shifting various contexts of place. Historical consideration acknowledges multiplicity and marginalization in a place, thus, legitimizes multiple place histories and invites multiple narratives to engage in dialogical process of place. With historical consideration, place identity can be approached and framed in its collective, dialogical nature within larger social, political contexts of place. The paper further suggests that place based education should be able to acknowledge and invite multiple histories and marginalized voices of students into creating a place to dwell together.  相似文献   

集自然历史、世界文化于一身的皇家安大略博物馆          下载免费PDF全文

伯顿·K·利姆 《自然科学博物馆研究》2018,(1):71-76

皇家安大略博物馆融合自然历史和世界文化于一身,藏品超过1250万件,大量开展国际范围的研究。2017年参观人数超过130万人次。该馆设有27个永久的世界文化和自然历史展厅、2个儿童动手实践探索展厅和4个用于临时展览的展区。该馆收集了两只鲸鱼的骨架,将其中一只鲸鱼的心脏做塑化处理后在主展厅展出,将在加拿大各地和其他国家和地区进行巡回展出。  相似文献