Padang, Indonesia

Andalas University
Padang, Indonesia

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.

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The objective of the present study was to evaluate the effects of stocking density on survival and larval development of Portunus pelagicus (Linnaeus, 1758) under laboratory conditions. First zoeal crabs were stocked in triplicate glass beaker at densities of 20, 30, 40, 50, and 60 larvae L−1. The result showed that high stocking density (40-60 larvae L−1) consistently produced low successful metamorphosis of first crab instar (19.11-20.00%). The low stocking density level (20-30 larvae L−1) tested in this study resulted in slightly higher C1 survival ranging from 22.67 to 23.11%. However, no significant difference (p > 0.05) was found in the treatments. The relationships between stocking density and larval development duration and successful metamorphosis of C1 were linear and quadratic respectively. This aims to generate further information on the relationship between stocking density and survival of C1 P. pelagicus. The result of this work will therefore provide a basis for future research on the effects of stocking density on the survival of C1 P. pelagicus. © 2017, BIOFLUX SRL. All rights reserved.

Muhafzan,Andalas University
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.

Susanti L.,Andalas University
Lecture Notes in Engineering and Computer Science | Year: 2015

By its geographically location, Indonesia is potential land for natural disasters. In the last decade, tsunami, eartquakes, volcanic eruption and landslides were predominantly Indonesia's natural disasters. This paper looks at the provision of emergency shelter for displaced people in warm and humid environment. Thermal condition of two types of emergency tents; a single and a double layer tents were calculated using Fanger's thermal comfort model namely PMV and PPD indices. The results of the PMV and PPD models then were compared with those obtained from thermal vote questioner. About 16 subjects were voluntarily participated in the study. It is found that the double layer tent gave better results of PMV and PPD indices compared to the single layer tent, but still it was beyond the range of acceptability of Fanger's thermal comfort. However, results from sensation votes and actual percentage of disability showed that the double layer tents were in the range of thermal acceptability of comfort. This indicated that the standard PPD of the ISO 7730 and ASHRAE Standard 55 overestimated the level of dissatisfaction in the emergency tents.

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..

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.

Pujani V.,Andalas University
World Academy of Science, Engineering and Technology | Year: 2011

The purpose of this study is to investiagte the use of the ecommerce website in Indonesia as a developing country. The ecommerce website has been identified having the significant impact on business activities in particular solving the geographical problem for islanded countries likes Indonesia. Again, website is identified as a crucial marketing tool. This study presents the effect of quality and features on the use and user satisfaction employing ecommerce websites. Survey method for 115 undergraduate students of Management Department in Andalas University who are attending Management Information Systems (SIM) class have been undertaken. The data obtained is analyzed using Structural Equation Modeling (SEM) using SmartPLS program. This result found that quality of system and information, feature as well satisfaction influencing the use ecommerce website in Indonesia contexts.

Yanuar F.,Andalas University
Journal of Physics: Conference Series | Year: 2014

Structural equation modelling (SEM) is a multivariate method that incorporates ideas from regression, path-analysis and factor analysis. A Bayesian approach to SEM may enable models that reflect hypotheses based on complex theory. The development and application of Bayesian approaches to SEM has, however, been relatively slow but with modern technology and the Gibbs sampler, is now possible. The Gibbs sampler can be used to obtain samples of arbitrary size from the posterior distribution over the parameters of a structural equation model (SEM) given covariance data and a prior distribution over the parameters. Point estimates, standard deviations and interval estimates for the parameters can be computed from these samples. This study shows that the conditional distributions required in the Gibbs sampler are familiar distributions, hence the algorithm is very efficient. A goodness of fit statistic for assessing the proposed model is presented. An illustrative example with a real data is presented.

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 .

Arbain D.,Andalas University
Natural Product Communications | Year: 2012

An inventory of Sumatran medicinal plants, and reports on their chemistry and conservation carried out in the last three decades are reviewed.

Lipoeto N.I.,Andalas University | Geok Lin K.,International Medical University | Angeles-Agdeppa I.,Food Republic
Public Health Nutrition | Year: 2013

Objective The present study was done to confirm the relationship between changes in food patterns and nutrition transition in three South-East Asian countries, namely the Philippines, Malaysia and Indonesia. Design This was a cross-sectional study conducted between August 2008 and August 2009 using three methods: interviews, focus group discussions and analyses of government reports. Setting The study was conducted in rural and urban areas in Manila and Calabanga (Philippines), Selangor and Kuala Selangor (Malaysia), and Padang, Pariaman Tanah Datar and Limapuluh Kota (West Sumatra, Indonesia). Subjects Adults aged 18 to 77 years. Results The results showed that Filipinos, Malaysians and Indonesians have retained many aspects of their traditional diets. In fact, most participants in the study considered Western-style and franchise fast foods as snack or recreational foods to be consumed once in a while only. However, a significant difference was noted between urban and rural areas in food varieties consumed. Participants in urban areas consumed more varieties of traditional foods owing to their availability and the participants' food purchasing power. Although traditional food patterns were maintained by most of the participants, more sugar and vegetable oils were consumed and added to the traditional recipes. Conclusions The rapid nutrition transition in this region may be due, instead, to increasing food availability and food purchasing power, rather than to a shift in food preferences towards modern Western foods. Copyright © The Authors 2012.

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