Universiti Teknikal Malaysia Melaka: UTeM Open Journal System
Not a member yet
2735 research outputs found
Sort by
TERRAIN MAPPING FROM UNMANNED AERIAL VEHICLES
No full textIn land surveying, digital terrain model (DTM) and digital surface model (DSM) have long been benefitted in many applications related to terrain mapping. Conventional methods of generating DTM and DSM have limitations in terms of practicality, time consumption and costing. The problems are much more serious for tropical regions where clouds are persistence and tend to affect the accuracy of most of these devices. This study aims to propose a novel way of generating DTM and DSM by utilising unmanned aerial vehicle (UAV) for different land covers including forest, plantation and developed areas in the tropical region of Malaysia. The aerial images obtained from non-matrix digital compact camera payload on UAV were processed photogrammetrically to produce terrain mapping products including DTM, DSM and orthophoto. A detailed survey is also conducted at these areas to produce contour map as benchmark data in which is less being practiced by UAV mappers. To determine the accuracy, quantitative and qualitative analysis were carried out by means of root mean square error (RMSE) and visual inspection. The results show that the RMSE of DTM for forest, plantation and developed area are ± 1.806 m, ± 0.938 m and ± 0.549 m, respectively while for DSM are ± 3.143 m, ± 0.637 m and ± 0.276 m respectively. This study has determined that, the development area gives the highest accuracy compared to the plantation and forested area in which for developed and plantation area the DSM is better than DTM while vice-versa for forested area. It can be concluded that the complexity if terrain is found to be one of the key factors that influences the accuracy of the generated DSM and DTM
EFFECT OF HYDRAULIC PRESSURE ON HARDNESS, DENSITY, TOOL WEAR AND SURFACE ROUGHNESS IN THE FABRICATION OF ALUMINA BASED CUTTING TOOL
No full textCutting tools can be considered major industrial necessities as it applied mostly to machine components. Development of self-fabricated cutting tool can facilitate lower machining cost as long as the cutting tool can perform effectively. This paper presents the effect of hydraulic pressure on density, hardness, wear performance and surface roughness during fabrication of the alumina based ceramic cutting tool. Specific raw of alumina powders were ball milled compacted into green body using hydraulic press with different pressures of 6, 7, 8 and 9 tons. These green bodies were sintered at 1700 0C in 4 hours soaking time. Hardness and density of sintered bodies were examined in order to correlate the effect of hydraulic pressure on mechanical properties. The samples were further tested into machining with AISI 1045 in order to evaluate their wear performances and surface roughness. The results show that density and hardness increased as the hydraulic pressure increased. The highest pressure of 9 tons demonstrated highest density and hardness of 2.77 g/cm3 and 86.1 HRA respectively. The fabricated cutting tool capable to cut the AISI 1045 steel with the minimum wear rate recorded at 0.0025 mm/s for 9 ton of pressured sample. In terms of failure modes, the cutting tool suffered with abrasive wear and cracks at the edge of tool nose radius. Surface roughness demonstrate minimum 1.24 µm for 7 ton of pressure, which considered high for short time machining process. Overall, the self-fabricated cutting tool capable to cut the steel without catastrophic failure which demonstrated promising results to be improved in the future
Factors That Affect the Green Technology Awareness in Melaka
Get PDFNowadays, in this era of globalization, the world keeps on developing day by day. Our earth is now becoming more polluted than before due to the environmental effects caused by human being. The greed of human being had caused them to ignore the consequences of their decision and how far it would affects the environment. In accordance with this, Melaka has decided to start going green by practicing Green Technology that will not only improves the quality of environment but as well as the quality of life for the citizen in Melaka. The objective of this research is to find out factors that affects the awareness towards Green Technology. This research was held in Melaka as the respondents all from Melaka citizens. Based on the conceptual framework, the independent variables are knowledge, attitude towards environment, and government policy and regulation. Meanwhile for the dependent variables is awareness towards Green Technology. The data was gained from questionnaire session, journals, articles which had been analyzed by using the SPSS system. As the results of this research, it stated that Government Policy and Regulation is the most effective factors towards awareness of Green Technology. The result also showed that mostly people in Melaka already aware about the Green Technology, they just lack in practicing the green practices. Therefore, hopefully Melaka citizens become more alert and aware towards the Green Technology which will lead to aspiration of Melaka to achieve greatly as the title of Melaka Green City on 2020
Sustainability and Future Challenges of Halal Product Consumption
Get PDFHalal businesses involving goods and services are experiencing an amazing growth. The Halal industry has become a lucrative industry contributing to an exceptional business opportunity for the industry players and entrepreneurs. Despite its great potential, especially its huge market covering local and international markets, the various challenges faced by the local industry has limit their performance on serving the halal market. Due to this constraint, consumers have misperception on the halal products availability in the market. Therefore, this study aims to review the consumers’ challenges and concern, particularly in consuming halal products. The survey through questionnaire was conducted by the researcher to collect respondent answer and the data collected was analysed by quantitative research method. A total 150 questionnaires were coded and analysed with statistical techniques. This research contributes to an understanding of how consumers look upon the sustainability of Halal product consumption
Conceptual Design of Co-Axial Floating Multiple-Rotors Water Current Turbine (FMRCT)
Get PDFDepletion of fossil fuel as well as increasing in price had pressured the world energy to give focus on renewable energy. This paper interest is to describe the conceptual design of a floating multiple-rotor water current turbine (FMRCT) as well as to investigate the effect of distance between two rotors over diameter ratio (S/D) towards power output increment. Further, the contribution of each rotor toward the FMRCT power output increment also will be discussed. With the interest to increase output power, FMRCT concept design is where few rotors were arranged in series with a suitable distance between each rotor, fitted with a floater at one end, and connected to a generator at the other end. The FMRCT model was tested in an open stream at Lata Ulu Licin (Lecin). Results show that increment of the output voltage is very significant as S/D increased up to S/D = 1.48. Furthermore, extra rotor on FMRCT also proportionately increase the power output, ranging almost similarly from 6.28% to 8.91% of power
Detection and Classification of Double Line to Ground Faults in a 138 kV Six Phase Transmission Line Using Hilbert Huang Transform
Get PDFIn this paper, Hilbert Huang transform based technique is introduced to detect and classify double line to ground faults in a 138 kV, 60 Hz, 68 km long six phase transmission line. Hilbert Huang transform is used to extract the hidden features contained in fault current signal in the form of Hilbert coefficients. The proposed technique does not requires the communication link between the two terminals of six phase transmission line since the fault current signals are recorded at the first terminal only i.e. at bus-1. For the justification of the proposed technique, wide variety of fault test studies were carried out in MATLAB/ Simscape power system toolbox for different types of three phase to ground faults by varying fault type, fault location, fault inception time, fault resistance and ground resistance. Test results shows that the Hilbert Huang transform based proposed technique effectively detects/ classifies the double line to ground faults
Application of QPSK-OFDM for Improved Underwater Wireless Communication System
Get PDFThe problems of signal loss and poor channel estimation are inherent in underwater communication. In this work, underwater communication system has been improved using Orthogonal Frequency Division Multiplexing (OFDM) system with quadrature phase shift keying (QPSK) based on modulation scheme. The modern choice of underwater communication system, where the available bandwidth was divided into many overlapping sub-channels, such that the symbol duration was compared to the multipath spread of the channel; thus, eliminating inter symbol interference as well as improving bandwidth availability. Matlab tool was used to develop and implement series of simulations of the underwater acoustic communication system model. The proposed OFDMQPSK underwater wireless acoustic technique achieved a BER of 2.44
MOTIVATION FACTORS FOR WOMEN TO BECOME AN ENTREPRENEUR AND CONTRIBUTE TO SOCIAL INNOVATION
Get PDFThis paper attempts to examine the motivational factors attached to women to become entrepreneurs and contribute to social innovation related to small and medium enterprises (SMEs), particularly in Melaka. The need theory was used as a theoretical framework to study the motivation of women to become an entrepreneur and contribute to social innovation. A survey research design involving the use of questionnaires and structured interviews were adopted to obtain primary data. There are 200 women entrepreneurs currently engaged in their businesses in Melaka. This study concludes that women entrepreneurs are motivated by a high need for achievement, a slight high need for power and a moderate need for affiliation. The paper also sheds some light to women entrepreneurship in emerging economies and recommends having more initiatives to encourage and develop women entrepreneurs to contribute to social innovation for the success of Malaysia's economy.
THE IMPACTS OF HF AND VHF RADIATION TOWARDS PRELIMINARY BREAKDOWN EVENTS IN LIGHTNING FLASHES
No full textEven though the mechanisms pertinent to the generation of radiation in frequency range above 3 MHz (HF and VHF radiation) are not well understood, it is thought that this radiation is caused by the electrical breakdown of virgin air rather than by the high current pulses propagating in pre-existing channels. The data presented in this paper also show that more HF radiation (3 MHz) is generated during preliminary breakdown processes taking place inside clouds (probably associated with breakdown of virgin air) than during the subsequent return strokes that propagate along conducting channels. Moreover, we also observe that VHF radiation (30 MHz) only from Preliminary Breakdown (PB) events
Speeding Up Interval Type 2 Fuzzy Logic Computation Using Fuzzy Bilinear Interpolation Look-Up Table
Get PDFInterval type 2 fuzzy logic system (IT2FLS) is one of the most straightforward approaches of type 2 fuzzy logic system that is relatively easy to implement. In line with the enhanced capability of the microprocessor, the interval type 2 fuzzy logic system becomes one of the solutions to overcome any problems associated with uncertainty. However, due to computation speed and limited resources, a real-time problem occurs when the IT2FLS is implemented to the low-cost microcontrollers. Based on this problem, it is essential to speed up the computation of IT2FLS. This paper proposes a method named Fuzzy Bilinear Interpolation-Look Up Table algorithm that uses saved information and fuzzy interpolation to obtain the output based on neighboring data to get higher data accuracy. From the simulation results, it was found that Fuzzy Bilinear Interpolation-LUT IT2FLS provides the same performance and computes 14 times faster than IT2FLS