374 research outputs found
Evaluating safety at railway level crossings with microsimulation modeling
No full textSafety at railway level crossings (RLXs) is a worldwide issue that increasingly attracts the attention of relevant transport authorities, the rail industry, and the general public. The differences in the operation characteristics of varying types of warning devices, together with differences in crossing geometry, traffic, or train characteristics, leads to different driver behaviors at crossings. The aim of this study was to use traffic microsimulation modeling based on field video recording data to compare the safety performance of varying conventional RLX warning systems. The widely used microsimulation model VISSIM was modified to produce safety-related performance measures, namely, collision likelihood, delay, and queue length. The results showed that RLXs with an active warning system were safer than those with a passive sign by at least 17%. Integration of surrogate measures in conjunction with traffic simulation models determined which safety approach was more efficient for specified traffic and train volumes
Integration of driving simulator and traffic simulation to analyse behavior at railway crossings
No full textThe use of state-of-the-art technology to collect and analyse data has significantly improved the effectiveness of safety studies. Currently, despite the fact that there are many safety systems deployed at railway crossings, only limited research has been conducted to evaluate which of these systems is the most effective in terms of costs and safety. This paper demonstrates a way to evaluate safety at railway crossings using a twin-pronged approach: a driving simulator and traffic simulation software. A number of outputs have been observed from a driving simulator, such as driver compliance rate, vehicle speed profile, acceleration profile, initial braking position and final braking position. The compliance percentage at passive crossings (67 and 72% for a stop sign and rumble strips, respectively) has lower compliance rates compared with active crossings (97 and 93% for flashing red light and in-vehicle audible warning, respectively) at an 80km/h approach speed. Using a statistical analysis it is shown that speed and acceleration profiles can be used to differentiate the effectiveness of active and passive crossings. These indicators are interpreted and used as input to a traffic simulation, which assists in determining which safety device is more efficient. By integrating driving simulator and traffic simulation models, this approach can be applied to evaluate and compare safety performance without the need to install costly test beds at real railway crossings
ODL: pencetus kreativiti pelajar / Prof. Madya Dr. Tey Li Sian and Shahreena Melati Rhasbudin Shah
No full textDisebabkan Perintah Kawalan Pergerakan (PKP) yang diumumkan pada 18 Mac 2020, segala aktiviti pengajaran dan pembelajaran terpaksa dilaksanakan secara atas talian termasuk ujian praktikal untuk kerja makmal. Tujuan ujian praktikal kerja makmal adalah untuk menguji kemahiran 'hands on' setiap pelajar dalam menjalani kerja makmal yang telah ditunjukkan di dalam kelas. Maka, untuk mengelakkan pelajar membaca sahaja prosedur makmal semasa ujian praktikal dijalankan, mereka diminta menyediakan bahan-bahan gantian yang sesuai bagi menunjukkan cara kerja makmal seperti contoh-contoh yang telah diberikan
ODL- our future direction of education?? / Li Sian Tey ... [et.al]
No full textOnline Distance Learning (ODL) has been widely implemented in Malaysia since the first lockdown on the 18th March 2019 due to the COVID'19. In ODL, students have more choices in learning what they want without the limitation of time and space. Here, we conducted a simple survey to evaluate the students' preference on different options they were exposed to in ODL and conventional face to face lectures in our faculty
Online distance learning and teaching during COVID-19 / Dr Kuan Woei Keong and Assoc. Prof. Dr Tey Li Sian
No full textImplementation of online teaching has started in our faculty since the movement control order (MCO) was announced in Mar 2020. Before the COVID 19, there was already adoption of virtual education environments in our university. Our lecturers have attempted to conduct lecture through online lessons despite the routine lecture in the physical classroom during the campaign “Week without Wall” in every semester since 2018. This initiative has helped to prepare our lecturers to adapt to the development of teaching and learning technology in this 21st century. Other than the ‘uFuture ’, an official online learning portal developed by UiTM, our staff are also encouraged to utilise third party platform as tools for teaching and learning. The third-party platforms used to conduct the online distance learning in our faculty include Google and Microsoft platforms. Both platforms have provided useful tools in aiding the teaching and learning activities. The implementation of online learning and teaching can be easily achieved through the online platforms. Classes can be organised and managed using either the platform of Microsoft Teams or Google Classroom. Lecturers are allowed to upload their lecture notes/slides prior to the online virtual class. The platforms also provide the statistic of the students’ participation and attendance during the virtual class. In the circumstances when some students are having unstable internet access to participate in the virtual class, pre-recorded lectures or recorded class video can be shared and uploaded. Both platforms are also providing tools to assign tasks and conduct tests among the students
Measuring driver responses at railway level crossings
No full textRailway level crossings are amongst the most complex of road safety control systems, due to the conflicts between road vehicles and rail infrastructure, trains and train operations. Driver behaviour at railway crossings is the major collision factor. The main objective of the present paper was to evaluate the existing conventional warning devices in relation to driver behaviour. The common conventional warning devices in Australia are a stop sign (passive), flashing lights and a half boom-barrier with flashing lights (active). The data were collected using two approaches, namely: field video recordings at selected sites and a driving simulator in a laboratory. This paper describes and compares the driver response results from both the field survey and the driving simulator. The conclusion drawn is that different types of warning systems resulted in varying driver responses at crossings. The results showed that on average driver responses to passive crossings were poor when compared to active ones. The field results were consistent with the simulator results for the existing conventional warning devices and hence they may be used to calibrate the simulator for further evaluation of alternative warning systems
Geometry model generation for space structure / Nurul Amira Noor Khairri, Yee Hooi Min And Tey Li Sian
No full textAbdul Malek (2020) mentioned that TFS consists of arrangement of tensioned fabric as the main components where the fabric pattern is tensioned to a rigid structural element by mechanical means. Abdul Hadi & Yee (2016) described that TFS employed membrane supporting geometry resulting in a positive (upward) and negative (downward) curvature of the structural membrane, in which the external loads are resisted by an increase in the stress of hogging warp around one axis of the TFS and the inward forces are resisted by an increase in the stress of the sagging warps around the other. It comes in various shape and design. In this research, developing minimum surface of TFS is recommended and can be applied to TFS. Abdul Hadi (2019) stated TFS has its own basic components which consist of supporting system, seam, fabric and cables where fabric surface is the main components. The selection of the fabric type is important as details shaped. Houtman (2015) stated that the TFS can divided the fibres that make up the fabric into natural fibers and chemical fibres. The fabric surface consists of three layers, one layer of woven yarn which consisted two directions of the textile warp and weft plus two layers of coating material to protect the fabric from external destruction such as ultraviolet light (UV light) radiation degradation, rainwater, snow and atmospheric moisture. Two yarns or more can be assembled by twisting in order to obtain a thread of higher strength
Development of parking model for campus environment / Tey Li Sian, Kuan Woei Keong and Siti Zaharah Ishak
No full textParking space is an important component in transportation system to function as terminal. The availability of parking space is always an important factor to achieve a better traffic system since over supply of parking space will incur extra cost and land, while an acute shortage of parking space will create traffic congestion. Therefore, lacking of information on parking demand may lead to uncertainty in decision making at planning stage. The objectives of this study are to obtain parking demand trend and develop mathematical model for estimating future vehicle parking demand of academic faculty in campus environment. The study found that the parking demand depends on the population of staff, student and visitors and linear regression analysis has been used to derive the casual relationships between parking demand and population. Two significant peak parking demand and drops in parking demand were observed in each study day. The results showed that the developed model gives better estimates compared with the existing guideline provided by local council
An overview of lane changing model at signalised intersection / Jezan Md Diah, Li Sian Tey and Fathiyah Roslee
No full textIn recent years, lane changing has become a crucial issue in traffic engineering and safety aspect due to distribution of vehicles across lanes thus contributing to traffic movements. In order to keep the right route, drivers have to change their lanes. However, lane changing has a high potential of accidents, especially at signalised intersection. This may cause the traffic flow to become heavier and traffic congestion. The aims of this study are to study on lane changing issue at signalised intersection, to determine the factors contributing to lane changing at signalised intersection and to develop a model for improvement of traffic flow in lane changing behaviour at signalised intersection. Lane changing model is important because it will reduce traffic congestion and smoothen the traffic. This study will contribute in studying the changing lane issue at signalised intersection which is to control the flow of traffic in order to ensure the traffic flows smoothly and to reduce traffic congestion especially on the merging issue at signalised intersection
Lignin: green modifier for road pavement / Shahreena Melati Rhasbudin Shah, Husna Nabilah Che Husin and Tey Li Sian
No full textBitumen is a petroleum-based hydrocarbon, obtained from a crude petroleum distillation, has been widely used as a binding material in pavement construction
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