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Search Results: 1 - 10 of 718 matches for " Nur Hardiansyah "
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Cross Entropy Method for Solving Generalized Orienteering Problem  [PDF]
Budi Santosa, Nur Hardiansyah
iBusiness (IB) , 2010, DOI: 10.4236/ib.2010.24044
Abstract: Optimization technique has been growing rapidly throughout the years. It is caused by the growing complexity of problems that require a relatively long time to solve using exact optimization approach. One of complex problems that is hard to solve using the exact method is Generalized Orienteering Problem (GOP), a combinatorial problem including NP-hard problem. Recently, there has been plenty of heuristic method development to solve this problem. This research is an implementation of cross entropy (CE) method in real case of GOP. CE is an optimization technique that relatively new, using two main procedures; generating sample solution and parameter updating to produce better sample for next iteration. At this research, GOP problem that occurs at finding optimal route consist of 27 cities in eastern China is investigated. Results indicate that CE method give better performance than those of Artificial Neural Network (ANN) and Harmony Search (HS).
Artificial Bee Colony Algorithm for Economic Load Dispatch Problem
Hardiansyah Hardiansyah
IAES International Journal of Artificial Intelligence (IJ-AI) , 2013, DOI: 10.11591/ij-ai.v2i2.1613
Abstract: In practical cases, the fuel cost of generators can be represented as a quadratic function of real power generation and satisfied constraints for minimizing of fuel cost. Artificial Bee Colony (ABC) algorithm is used for the optimization of active power dispatch of generating units. The proposed method is able to determine, the output power generation for all of the power generation units, so that the total cost is minimized. Simulation and analysis of economic load dispatch using Artificial Bee Colony (ABC) algorithm is proposed. The obtained results are compared with the conventional method, genetic algorithm (GA) and shows that the ABC algorithm approach is more feasible and efficient for finding minimum cost.
Multiobjective H2/H? Control Design with Regional Pole Constraints
Hardiansyah Hardiansyah,Junaidi Junaidi
TELKOMNIKA : Indonesian Journal of Electrical Engineering , 2012, DOI: 10.11591/telkomnika.v10i1.659
Abstract: This paper presents multiobjective H2/H? control design with regional pole constraints. The state feedback gain can be obtained by solving a linear matrix inequality (LMI) feasibility problem that robustly assigns the closed-loop poles in a prescribed LMI region. The proposed technique is illustrated with applications to the design of stabilizer for a typical single-machine infinite-bus (SMIB) power system. The LMI-based control ensures adequate damping for widely varying system operating conditions. The simulation results illustrate the effectiveness and robustness of the proposed stabilizer.
Solving Economic Load Dispatch Problem Using Particle Swarm Optimization Technique
Hardiansyah,Junaidi,Yohannes MS
International Journal of Intelligent Systems and Applications , 2012,
Abstract: Economic load dispatch (ELD) problem is a common task in the operational planning of a power system, which requires to be optimized. This paper presents an effective and reliable particle swarm optimization (PSO) technique for the economic load dispatch problem. The results have been demonstrated for ELD of standard 3-generator and 6-generator systems with and without consideration of transmission losses. The final results obtained using PSO are compared with conventional quadratic programming and found to be encouraging.
How Interlinks Influence Federated over SPARQL Endpoints  [PDF]
Nur Aini Rakhmawati
International Journal of Internet and Distributed Systems (IJIDS) , 2013, DOI: 10.4236/ijids.2013.11001
Abstract: As the Web of Data grows, the number of available SPARQL endpoints increases. SPARQL endpoints conceptually represent RPC-style, coarse-grained data access mechanisms. Nevertheless, through the potential interlinking of the contained entities, SPARQL endpoints should be able to over distinct advantages over plain Web APIs. To our knowledge, to date, there has been no study conducted that gauges the impact of the link on SPARQL query execution, especially in a federated set-up. In this paper, we investigate how the existence and types of typed links influences the execution characteristics of different SPARQL federation frameworks. In order to measure the query performance, we propose a combined cost model based on a statistic analysis of the query performance metrics that involves parameters such as type of link, the data catalogues and cache, number of links, and number of distinct subjects. As result, we show that number of distinct subject and number of links have significant impact on Federation over SPARQL Endpoints performance whereas type of link does not have significantly influence in federation query performance.
Systems Structure of Education for Sustainable Development in Higher Education Institution  [PDF]
Siti Nur Diyana Mahmud
Creative Education (CE) , 2017, DOI: 10.4236/ce.2017.89097
To understand the enactment of Education for Sustainable Development (ESD) in higher education institution (HEI) and why very unequal ESD activity that mostly focused on campus greening rather than on pedagogic reform in HEI requires more than simply an examination of the ESD curriculum and pedagogy. To grasp why and how ESD is implemented in a HEI, the contexts in which it was created and implemented should be considered. Systems structures that include the context of the phenomena can show how the interaction between various factors gives rise to the outcomes that can be observed at the event level which is the enactment of ESD at the HEI. This paper presents a finding of the case study concerning systems structure of ESD conducted at one Malaysia university. This study is explanatory and may give insight to understand ESD enactment in HEI especially in Asian and developing country context. The findings from this study demonstrate that the agents’/ lecturer’s individual systems and the organisational/university system are co-evolving with their environment. The changes in the environment, such as the accelerating sustainability crisis and global influence, are perceived by the lecturers as stimulating ESD enactment in the university. The university’s response to the sustainability agenda involves temporality and selection. This explained the university’s delayed response to the sustainability agenda, until sustainability agenda gained attention globally after the Brundtland Report in 1987.Despite the forces to adapt to environmental changes, within a system there is resistance to change. In this study, it included: the lecturers’ perceived lack of sustainability awareness; sustainability acceptance influenced by disciplines; limited financial support from the university; a compartmentalised education system; bureaucratic tensions; and lacking of teaching skills among ESD educators.
The Benefits and Constraints of the Use of Information and Communication Technology (ICT) in Teaching Mathematics  [PDF]
Nur Afiqah Zakaria, Fariza Khalid
Creative Education (CE) , 2016, DOI: 10.4236/ce.2016.711158
Abstract: The development of information and communication technology (ICT) has affected educators’ teaching methods through its application in learning and teaching mathematics. The objective of this systematic analysis is to explore the benefits and constraints of ICT that have been faced by educators during learning and teaching processes for mathematics. Based on selected literature, it was found that the advantages of applying ICT in teaching mathematics are: It attracts students’ interest in learning mathematics; it increases their motivation and performance; it encourages lifelong learning; and it facilitates positive interactions and relationships. Nevertheless, a few constraints have been faced by mathematics educators during teaching processes involving ICT. Identified constraints and limitations are: Educators lacking knowledge of ICT; minimal training and opportunities for learning about ICT; and limited technical support. Therefore, it is suggested in the literature that there is a need for an increase in training for mathematics educators in terms of computer usage and ICT applications for teaching purposes. Technical support should also be a concern, so as to motivate mathematics educators to apply elements of ICT in their teaching. This could maintain the positive changes and perception of students regarding learning mathematics.
Iron (III) Chloride Catalyzed Claisen Rearrangement Reaction of Allyloxyarenes under Microwave Conditions  [PDF]
Indah Nur Pramesti, Yutaka Okada
Green and Sustainable Chemistry (GSC) , 2017, DOI: 10.4236/gsc.2017.73018
Abstract: The Claisen rearrangement is a [3,3]-sigmatropic rearrangement which is an important method for new C-C bond formation in organic synthesis. This reaction is a typical thermal reaction that requires a high temperature and long reaction time. In this paper, the acceleration effects of the iron (III) chloride (FeCl3) catalyst and microwave irradiation during the Claisen rearrangement reaction of allyloxyarene derivatives are reported. The FeCl3 catalyst was able to initiate the reaction at low temperature and induced the subsequent cyclization reaction. The moderation of excellent yields was obtained in a short reaction time. The formation of complex ferric-arenes under microwave irradiation conditions to efficiently absorb the microwaves was expected and confirmed.
Comparison of Rehabilitation Outcomes with Acoustic Radiation Force (ARFI) Elastosonography in Hemiplegic Patients Treated with Neuromuscular Electrical Stimulation  [PDF]
Murat Toprak, Nur?en Toprak
Open Journal of Therapy and Rehabilitation (OJTR) , 2019, DOI: 10.4236/ojtr.2019.71001
Abstract: To evaluate the gastrocnemius/soleus and biceps brachii muscle stiffness by Acoustic Radiation Force Impulse (ARFI) elastography in the hemiplegia patients, sixty patients with hemiplegia after stroke were recruited. Baseline data were collected including age, gender, body mass index, education level, dominant side, affected side, time since stroke, stroke etiology. All patients were evaluated with before treatment and posttreatment with Broonstroom staging, Modified Ashworth spasticity scale, and Functional Independence Measures scale. The patient was divided into 3 groups: 1) Neuromuscular electrical stimulation group, 2) Rehabilitation group, 3) Neurumusculer electrical stimulation + Rehabilitation group. Affected and unaffected side biceps and gastrocnemius, ARFI elastography measurements were used to measure thickness and elastic values. In addition, before and after
The Effectiveness of Postpartum Exercise and Oxytocin Massage on Uterus Involution  [PDF]
Dian Nur Hadianti, Djudju Sriwenda
Open Journal of Nursing (OJN) , 2019, DOI: 10.4236/ojn.2019.93023
Abstract: The process of involution will work well if uterus contraction is strong, so a treatment can be done to improve uterus contraction. Postpartum exercise can make uterus muscles undergo contractions and retractions. In addition to pospartum exercise, being control of bleeding from the placenta attached is maintaining contraction and retraction fiber of strong myometrium through oxytocin massage. Purpose: This study aimed to ascertain influences of postpartum exercise and oxytocin massage on uterus involution. Method: The design used is quasi experimental research using post test only designing two comparison treatments. This research was conducted at PONED (basic emergency obstetric and neonatal care) in Bandung. The sample size was 50 respondents (25 respondents were given treatment for postpartum exercise and 25 respondents were given the oxytocin massage treatment). The sampling technique with non probability sampling techniques was by means of quota sampling. The data use primary data through the process of interview and observation. Deep data collection tool uses observation sheets and questionnaires. Result: The average uterus involution on the postpartum exercise group was 8.68 days, while the oxytocin massage group was 6.72 days. The results of the Mann Whitney Test statistic were at 95% confidence level; there was a significant difference in uterus involution between the postpartum exercise group and the oxytocin massage group with a value of p < 0.001 (p ≤ 0.05). Oxytocin massage is more influential to accelerate uterus involution. Conclusion: Oxytocin massage is more influential than pospartum exercise to uterus involution.
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