Journal of Engineering & Technological Advances

SAVE ME EMERGENCY DETECTION IN MOBILE APPLICATION FOR TEENAGERS

2021-10-24T05:44:54+00:00

The smartphone comes with many advanced features such as Wi-Fi, Global Positioning System (GPS) navigation, high-resolution cameras, and a touchscreen with broadband access that help users stay connected worldwide. This study focused on the development of a system framework for mobile application in emergency services that triggered fall detection. The mobile application is named Save Me! Application (app), where it can provide a simple medium to provide safety awareness to public people, especially among teenagers. The app can pinpoint the victim’s exact location when the device triggers fall detection. Subsequently, the message can be distributed to relatives, parents, or friends who have been pre-registered in the app to help the victim. The app also offers additional protection to parents or families who are busy working so that they can keep track of their children.

TREND ANALYSIS OF RIVER FLOW IN LANGAT RIVER BASIN USING SWAT MODEL

2021-10-05T03:18:08+00:00

The increase in population and the human activities in this basin area has led to many water shortage problems. This research was carried out to investigate the impacts of land-use changes and urbanization on water discharge in Langat River Basin using ArcGIS. It was applied using the Soil Water Assessment Tool (SWAT). This research aimed to identify how critical land-use changes and the increment of the population in Langat River Basin could impact the water discharge. The rainfall, humidity, solar, wind speed data from 2010 – 2016 were used for modelling purposes. The results obtained from calibrated results were satisfactory, with the value of the coefficient of determination of 0.63 and the value of Nash-Sutcliffe Efficiency (NSE) of 0.69. The precipitation and river flow pattern observed shows decreasing in the river flow from May to September 2016 and increased in November to December 2016. It can be observed that the river flow decreased due to some factors, and this may be a concerning issue as Langat River Basin is used to supply water to people in Klang Valley. This paper has proven that the GIS technology and Arc SWAT model can simulate the streamflow in Langat River Basin and can be further demonstrated to other basins. The model also can be used for further analysis and for in the future.

DEVELOPMENT OF MATERIAL SELECTION SOFTWARE FOR NON-FERROUS METALS

2022-03-30T09:02:34+00:00

A huge number of materials are available to the modern engineer, but selecting the appropriate material for engineering application is a complex task. This work tries to solve the material selection problem by developing the material selection software. The software adopts the Multi Attribute Decision Making technique for the selection. An optimization criterion (goal programming) was introduced, and the software uses this to prioritize materials suitable for an application. The software contains a graphical user interface as front end and a database management system as back end. Database was created, and by writing structured query language statements, commands were executed by the database management system. Nonferrous materials with their properties were stored in the database. Management system uses the algorithm to search the database and select optimum material based on desired criteria input in the graphical user interface. The material selection software developed in this research work was tested for selection of material. A criterion for selecting material for connecting rod for motor bikes application was given. The software scanned through the database and searched for materials with range of these properties and optimizes each and ranked them. Results displayed two aluminum materials and found out that Aluminum 7075-T73 was the optimum material for the application. Software was validated using Granta Cambridge Engineering Selector software which showed that the material selection software developed in this work is valid for selection of materials.

STRESS ANALYSIS OF VARIOUS DESIGNS OF CENTRIFUGAL PUMP IMPELLERS USING FINITE ELEMENT METHOD

2022-06-29T08:57:54+00:00

The impeller blade is among the many critical components in a centrifugal pump that affect the efficiency of the pump, as it is the component through which the fluid passes. Therefore, the impeller requires as many analysis as possible to maximise its efficiency. The main requirement is to ensure that the impeller blade can withstand the level of stress thereby reducing the chance of blade fracture. In this paper, 4 different designs of a centrifugal pump impeller were analysed and compared using finite element analysis (FEA) under static analysis. The geometry of centrifugal pump impellers was modelled and analysed using Siemens NX™ software. This analysis provided an insight of performance of design where the blade’s angle, width and shrouds are kept constant throughout the process. Calculations were performed to predict the design discharge and understand the impact on the impeller if the blade angle changes. The analysis revealed that the higher the outlet blade angle is to a point in comparison to the blade at inlet, the higher the head and the higher the pressure at the outlet will be. A pressure load of 1.866 MPa was applied evenly to the impellers with a rotation of 1,100 rpm and a torque of 29.187 Nm. Throughout the analysis, closed impeller blades were set to produce the least stress and displacement in comparison to other designs. Therefore, closed impeller was the best design, where the maximum stress was the lowest (86.09MPa) and can be more reliable in real life application.

DATA TRANSMISSION IN MIMO-OFDM TECHNOLOGIES FOR CURRENT AND FUTURE WIRELESS COMMUNICATION SYSTEMS: FROM THEORY TO PRACTICE

2022-04-12T04:57:35+00:00

This paper presents a Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) communication system with space-time and space-Frequency block coded (STBC/SFBC) of present generation downlink channel. Space-time block coding (STBC) and space-frequency block coding are transmit diversity schemes used in a wireless communication system to mitigate the effect of channel fading. The system is aimed to reduce the error rate (BER) by mitigating the effect of multipath fading which increase the quality of the system. In the proposed system, 2 transmit and 2 receive antennas are used, to transmit modulated symbols of block N across an OFDM channel, using SFBC Alamouti’s based encoding algorithm (SFBC-OFDM) derives from the basic criteria for space-time block codes (STBC). The signals from the first and second antennas are encoded and transmitted simultaneously in space and frequency over frequency-selective Rayleigh fading channel using two adjacent carriers. The work examines the SFBC and spatial diversity benefits realized based on the BER performance. The result is simulated effectively using MATLAB application software and the BER performance is compared with the conventional STBC-OFDM. It is shown that both STBC and SFBC techniques achieve similar performance with a diversity gain of four (4) over a slow fading channel with 2 antennas at both ends of the link under simple processing across the transmit and receive antennas.

SHORT REVIEW ON RENEWABLE ENERGY POLICY AND ENERGY CONSUMPTION OF BUILDINGS IN MALAYSIA

2021-09-24T03:12:07+00:00

The energy generation sector has contributed a large percentage of greenhouse gases (GHG) emissions in Malaysia. Carbon dioxide emissions from the burning of traditional energy source like fossil fuels to meet the ever-growing demand for electricity contributes to global warming. Therefore, transitioning into a greener and more sustainable energy alternative has been a priority to the government and stakeholders. As Malaysia is a developing country, renewable energy development is growing relatively at a slow pace and therefore public and private sectors are taking initiatives as well to reduce electricity consumption. A case study was done on public higher institutions in Malaysia to analyze electricity consumption by comparing the building energy index (BEI) with the standards proposed by MS1525. This paper also includes a brief summary of practices and strategies done by buildings in Malaysia to promote energy efficiency and reduce electricity consumption that can be used as an example and implemented by others to incorporate energy efficient practices. With the participation of all stakeholders, we are able to create a future with a more sustainable energy source and reduce the dependency on fossil fuels.