University of Andalas is an university in the Indonesian city of Padang, in the Province of West Sumatra. It consists of 15 faculties, most of them located at the main campus building, Limau Manis, 12 km from the centre of the city. The campus occupies 5 km². The Faculty of Medicine and Faculty of Dentistry are located in the city center, near the Central General Hospital M. Djamil.It is the oldest university in Indonesia outside of Java. Wikipedia.
Ridwan F.,University of Auckland |
Ridwan F.,Andalas University |
Xu X.,University of Auckland
Robotics and Computer-Integrated Manufacturing | Year: 2013
Tight quality requirements and stringent customer demands are the main thrust behind the development of new generation machine tool controllers that are more universal, adaptable and interoperable. The development of some international standards such as STEP and STEP-NC presents a vision for intelligent CNC machining. Implementation of STEP-NC enabled Machine Condition Monitoring (MCM) is presented in this paper. The system allows optimisation during machining in order to shorten machining time and increase product quality. In the system, an optiSTEP-NC, an AECopt controller and a Knowledge-Based Evaluation (KBE) module have been developed. The aim of the optiSTEP-NC system is to perform initial feed-rate optimisation based on STEP-NC data to assist process planners in assigning appropriate machining parameters. AECopt acts as a connector between the process planner and machining environment with the intention to provide adaptive and automatic in-process machining optimisation. KBE based-MTConnect is responsible for obtaining machining know-how. Optimisation is performed before, during or after machining operations, based on the data collected and monitored such as machining vibration, acceleration and jerk, cutting power and feed-rate. © 2012 Elsevier Ltd. All rights reserved.
Makky M.,Asian Institute of Technology |
Makky M.,Andalas University |
Soni P.,Asian Institute of Technology
Computers and Electronics in Agriculture | Year: 2013
Despite being the main oil palm (Elaeis guineensis Jacq.) producer in the world, Indonesia still has scope to improve its productivity, which is currently limited by inconsistency in manual grading through human visual inspection. In this research, an automatic grading machine for oil palm fresh fruits bunch (FFB) is developed based on machine-vision principles of non-destructive analytical grading, using Indonesian Oil Palm Research Institute (IOPRI) standard. It is the first automatic grading machine for FFBs in Indonesia that works on-site. Machine consists of four subsystems namely mechanical, image processing, detection and controlling. The samples used were tenera variety fruit bunches from 7 to 20year old trees. Statistical analysis was performed to generate stepwise discrimination using Canonical Discriminant with Mahalanobis distance function for classifying groups, and appoint cluster center for each fraction. Results showed adaptive threshold algorithm gave 100% success rate for background removal, and texture analysis showed object of interest lies in intensity within digital number (DN) value from 100 to 200. Group classification of FFBs resulted average success rate of 93.53% with SEC of 0.4835 and SEP of 0.5165, while fraction classification had average success rate of 88.7%. Eight models are proposed to estimate weight of FFBs with average R2 of 81.39%. FFBs orientation on conveyor belt showed no influence on the sorting result, and with examination time of 1 FFB/5s, machine performs more than 12tons FFBs grading per hour. © 2013 Elsevier B.V..
International Journal of Applied Mathematics and Computer Science | Year: 2010
This paper deals with the Linear Quadratic Regulator (LQR) problem subject to descriptor systems for which the semidefinite programming approach is used as a solution. We propose a new sufficient condition in terms of primal dual semidefinite programming for the existence of the optimal state-control pair of the problem considered. The results show that semidefinite programming is an elegant method to solve the problem under consideration. Numerical examples are given to illustrate the results.
Schroder-Butterfill E.,University of Southampton |
Fithry T.S.,Andalas University
Ageing and Society | Year: 2014
The provision of physical care is a sensitive matter in all cultures and is circumscribed by moral injunctions and personal preferences. Research on Western cultures has shown care networks to be narrow subsets of people's wider networks and revealed dependence to be deeply undermining of full personhood. In non-Western societies these issues have received little attention, although it is sometimes assumed that care provision and dependence are much less problematic. This paper uses longitudinal ethnographic data from two ethnic groups in rural Indonesia to compare care preferences and practices in old age and to examine the implications of care dependence. The groups manifest varying degrees of daughter preference in care and differ in the extent to which notions of shame and avoidance prohibit cross-gender intimate care and care by 'non-blood' relatives. Demographic and social constraints often necessitate compromises in actual care arrangements (e.g. dependence on in-laws, neighbours or paid carers), not all of which are compatible with quality care and a valued identity. We argue that by probing the norms and practices surrounding care provision in different socio-cultural settings, it becomes possible to arrive at a deeper understanding of kinship, personhood and sociality. These insights are not only of sociological interest but have implications for people's vulnerability to poor quality care in old age. © 2012 Cambridge University Press .
Thamrin R.,Andalas University
Journal of Engineering Science and Technology | Year: 2016
This paper presents a study on the effect of end anchorage length and stirrup ratio on bond and shear capacity of concrete beams reinforced with Carbon Fiber Reinforced Polymer (CFRP) bars. This study was carried out using test data on nine simply supported reinforced concrete beams with stirrups. The beams were subjected to two point monotonic loads and the test variables were the length of end anchorage and the stirrup ratio. Theoretical equations for calculating bond strength and shear capacity obtained from literature were applied and then compared with experimental values. Beams with inadequate end anchorage length showed premature bond failure even when there was sufficient stirrup ratio. Beams with adequate end anchorage length failed in shear or flexure modes depending on the stirrup ratio. A numerical model for bond stress and slip in response to pullout forces was also used to determine analytically the bond stress distributions along end anchorage. The behavior of tensile force acting on the stirrups was also examined. Finally, a simple model for predicting tension force acting on the stirrups was proposed. © School of Engineering, Taylor’s University.