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Munaaim M.A.C.,University Malaysia PerlisPerlis | Al-Obaidi K.M.,University of Malaya | Ismail M.R.,Universiti Sains Malaysia | Rahman A.M.A.,Universiti Sains Malaysia
Jurnal Teknologi | Year: 2015

Electrical lighting consumed 13% to 43% from overall energy which considered as second major usage of electrical energy in a building. Fibre optic daylighting is a potential approach for the remote source daylighting which is able to minimize the usage of electrical light if the minimum recommended standard of human comfort is achieved.Since the internal humidity also plays an important role in human comfort, the objectives of this research are to investigate the effects of the application inside building for humidity.This research assessed the potential of fibre optic daylighting for interior illumination using 4 m × 5 m × 2.8 (H-Ceiling) spaces through empirical data collection in an actual environment. The data were collected for every 5 minutes from 8:00 AM to 6:00 PM on the 17th May 2013 until the 2nd June 2013 using 4 computer-linked sensors to record humidity for both external and internal building. The comparison approach was selected in analyzing the data collected with the observation..It is shown that the fibre optic daylighting system has no significant effect in relative humidity even possibly increases the internal room temperature by 2°C. © 2015 Penerbit UTM Press. All rights reserved.

Shukor S.A.A.,University Malaysia PerlisPerlis | Shukor S.A.A.,University of Warwick
Jurnal Teknologi | Year: 2014

This paper highlights on the process of optimizing a SICK PLS 101 laser scanner sensor to collect 3D data of building interiors. The sensor, which is an industrial-based, is used to perform tasks like inspection, metrology and safety. 3D modelling of building interiors has gained a lot of interest recently, and the model can be used as the 3D as-built and assist facility management processes, as well as for preserving and conservation of old important buildings. On the other hand, not all sensors are capable of generating suitable data that can be used to produce the 3D model. LIDAR for example, is the preferred sensor in collecting interior data, but is prohibitive to some due to its cost. In addition to that, it usually comes with its own programme to collect the data, which can lead towards standardization issues. Other system like stereo vision can also be used; however it has limitations when handling occlusion and clutter while capturing in-use interior data. Thus, utilizing a SICK PLS 101 laser scanner to collect 3D interior data will provide a low cost solution in producing 3D interior models. The laser sensor can only scan in 2D for 180° horizontal area, yet by installing a servo motor, it is able to scan a hemispherical area in one operation. The overall system is sufficient to gather 3D data of a building interior – it can handle occlusions and clutter within an interior, is able to produce a standard ASCII file as well as generating output with adequate resolution, which can also solve the issues of standardization and the massive datasets created by LIDAR. As a conclusion, by optimizing a SICK PLS 101 laser scanner, we are able to produce a low cost, low level solution to gather 3D data of building interiors. Due to the restriction in cost and features of other sensors, the capability to utilize this sensor is appreciated. © 2014 Penerbit UTM Press. All rights reserved.

Paulraj M.P.,University Malaysia PerlisPerlis | Teh J.,University Malaysia PerlisPerlis
Jurnal Teknologi | Year: 2015

Differentially enabled communities face much difficulties and challenges in their life time while commuting from one place to another. Power wheelchairs were designed to aid the movement of these differentially enabled subjects and a Brain Computer Interface can also be applied to replace the existing conventional joystick method of controlling the movement of a wheelchair without using hands. In this research work, a simple protocol is proposed to record the EEG signals emanated from a subject while the subject performed four different kinesthetic motor imagery tasks. The noise present in the EEG signals are removed and three different feature sets, namely, power spectral density, Mel-frequency cepstral coefficients and Mel-frequency band structure based energy features are extracted. The extracted features are then associated to the type of motor imagery tasks and three multi-layer Perceptrons trained with Levenberg-Marquardt method are developed. The performance of the three Perceptron models are evaluated in term of classification rate and compared. From the results, it is observed that the Perceptron model trained with Mel-frequency band structure based features has yielded a higher classification accuracy for all 5 subjects, which is between 92.64-97.72%. The obtained result clearly indicates that the Mel-frequency band structure based features has potential to classify the four different motor imagery tasks. © 2015 Penerbit UTM Press. All rights reserved.

Hussain N.S.,University Malaysia PerlisPerlis | Basri H.H.,University Malaysia PerlisPerlis | Yaacob S.,University of Kuala Lumpur
Jurnal Teknologi | Year: 2015

Sliding mode control is known to be robust against parameter uncertainties and external disturbances. Based on the dynamic equation of motion, a sliding mode controller is designed to solve this problem. However, for the sliding surface to be attractive, a switching function is used in the control law, which caused chattering of the control signal. In order to avoid this, a boundary layer method is considered in the modified controller. So this paper proposes new boundary layer designs that resolve the problem in control accuracy and control signal smoothness in sliding mode control. The propose design improve the system state to almost zero with no chattering in the control signals. © 2015 Penerbit UTM Press. All rights reserved.

Abdul Shukor S.A.,University Malaysia PerlisPerlis | Wong R.,Geodelta Systems Sdn. Bhd | Rushforth E.,University of Warwick | Basah S.N.,University Malaysia PerlisPerlis | Zakaria A.,University Malaysia PerlisPerlis
Jurnal Teknologi | Year: 2015

Building Information Modelling (BIM) has gathered a lot of interest in Architectural, Engineering, Construction (AEC) areas. BIM introduces the 3D visualization element in designing and constructing new buildings, where the same design can be used to manage the building afterwards by assigned it as the 3D as-built. For existing building, professionals like architects and civil engineers need help from a specific hardware, like a 3D terrestrial laser scanner, to gather the data representing its interior and exterior. Although by applying 3D visualization or modelling for post-construction brings a lot of advantages, the implementation process are still slowly improving, compared for pre- and during construction, where it has reached its maturity. This paper will emphasizing on these advantages by discussing the benefits of implementing 3D as-built for current existing buildings and highlighting some case studies from projects done by Geodelta Systems Sdn. Bhd. towards several buildings in Malaysia. From here, having a 3D terrestrial laser scanner has brought a lot of improvement in managing existing buildings for various reasons, from fabrication, renovation to maintenance. Challenges of applying BIM for post-construction are also features here, to show on why the development are slow, compared to pre- and during construction process. © 2015 Penerbit UTM Press. All rights reserved.

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