Hendriko H.,Politeknik Caltex Riau
Key Engineering Materials | Year: 2017
This paper presents a new method to calculate the feed scallop height for a toroidal cutter during a free-form surface machining in multi-axis milling. The proposed method is an extended analytical boundary method to define the cut geometry during a free-form surface milling. The algorithm was developed by taken into account the existence of inclination angle. The proposed method was successfully implemented to calculate the scallop for two model parts with different surface profiles. The accuracy was verified by comparing the scallop height calculated using the proposed method with those measured using Siemens-NX. The results proved that the proposed method was accurate. © 2017 Trans Tech Publications.
Nengsih W.,Politeknik Caltex Riau
2015 3rd International Conference on Information and Communication Technology, ICoICT 2015 | Year: 2015
Association Rules is one of the data mining techniques which is used for identifying the relation between one item to another. Creating the rule to generate the new knowledge is a must to determine the frequency of the appearance of the data on the item set so that it is easier to recognize the value of the percentage from each of the datum by using certain algorithms, for example apriori. This research discussed the comparison between market basket analysis by using apriori algorithm and market basket analysis without using algorithm in creating rule to generate the new knowledge. The indicator of comparison included concept, the process of creating the rule, and the achieved rule. The comparison revealed that both methods have the same concept, the different process of creating the rule, but the rule itself remains the same. © 2015 IEEE.
Hendriko,Politeknik Caltex Riau
Jurnal Teknologi | Year: 2015
This paper presents the method to calculate the geometries of instantaneous chip in five-axis milling. The inclination angle changes in between two consecutive CC-points were taken into account in the calculation. In the first stage, the engagement angle, the axial depth of cut and cut width were determined through the mapping technique. The engagement point of the Work piece Coordinate System (WCS) was mapped to a Tool Coordinate System (TCS). In the second stage, the engagement angle and depth of cut, which were defined in the first stage were then used as a primary input to obtain the cut thickness and cut width. Two simulation tests have been presented to verify the ability of the proposed model to predict the cut geometry. The first tests revealed that the inclination angle makes the size of the cut thickness and cut width fluctuate. The cut width increased when the tool inclination angle increased. For the cut thickness, its magnitude was influenced by two effects, the orientation effect and the tooth path effect. The final result was a compromise between these two effects. In the second simulation test, the proposed model was successfully implemented to support the feedrate scheduling method. © 2015 Penerbit UTM Press. All rights reserved.
Hariyawan M.Y.,Politeknik Caltex Riau |
Gunawan A.,Politeknik Caltex Riau |
Putra E.H.,Politeknik Caltex Riau
Telkomnika | Year: 2013
Forest fires are one of problems that threaten sustainability of the forest. Early prevention system for indications of forest fires is absolutely necessary. The extent of the forest to be one of the problems encountered in the forest condition monitoring. To overcome the problems of forest extent, designed a system of forest fire detection system by adopting the Wireless Sensor Network (WSN) using multiple sensor nodes. Each sensor node has a microcontroller, transmitter/receiver and three sensors. Measurement method is performed by measuring the temperature, flame, the levels of methane, hydrocarbons, and CO2 in some forest area and the combustion of peat in a simulator. From results of measurements of temperature, levels of methane, a hydrocarbon gas and CO2 in an open area indicates there are no signs of fires due to the value of the temperature, methane, hydrocarbon gas, and CO2 is below the measurement in the space simulator.
Firdaus M.,Politeknik Caltex Riau |
Nengsih W.,Politeknik Caltex Riau |
Surya I.,Politeknik Caltex Riau
Advanced Science Letters | Year: 2014
Concept of call center technology with interactive voice response as one of main options on company to improve service to the customer. This technology supports implementation of CRM concepts, that able to maintain customer for keeping a loyalty to the company. This service is correspond with customer. Costumer is an object that will decide a future business development. Company will eventually lose market share if they do not notice customer as its object. However, the problems occurred for implementation of development service cost is quite large if we buy ready-made product in software house. Some companies choose to focus on IT development as cost center then it needs to develop an IVR call center service based VoIP. Based on the need to develop a call center IVR services with advanced VoIP-based access via PSTN, CDMA and GSM. The results of a study is the comparison of the use of VoIP-based IVR systems with commercial IVR system. © 2014 American Scientific Publishers All rights reserved.
Wibowo A.,Politeknik Caltex Riau
2015 International Seminar on Intelligent Technology and Its Applications, ISITIA 2015 - Proceeding | Year: 2015
In the traditional ETL (Extract Transform Loading), refreshment of data warehouse must be done in off peak hours. It means that all operational and analysis stopped from their all activities. It cause the level of freshness of data in the data warehouse is not indicating the latest operational transaction. This problem is called by data latency. Near real time data warehousing is used to be a solution for this problem. It update data warehouse in near real time manner, immediately after change data detected in data source. Thus, data latency can be minimized. In development, near real time data warehousing have problems where previously not found on the traditional ETL. This paper aims to convey the problems and available solutions at each stage in the near real time data warehousing, i.e. extraction, transformation, and loading. The problems and available solutions are based on literature review from other research that focusing on near real time data warehousing problem. © 2015 IEEE.
Yanuar M.H.,Politeknik Caltex Riau |
Yanuar M.H.,Gadjah Mada University |
Hidayat R.,Gadjah Mada University |
Firmansyah E.,Gadjah Mada University
International Journal of Electronics and Telecommunications | Year: 2016
LED driver has the potential to interfere the system of electronic devices if the voltage and current change rapidly. Several previous studies presented various solutions to overcome this problem such as particular converter design, component design, electromagnetic interference (EMI) filters, and spread-spectrum techniques. Compared to other solutions, the spread-spectrum technique is the most potential way to reduce the EMI in LED applications due to its limited cost-size-weight. In this paper, the effectiveness of conducted EMI suppression performance and the evaluation of its effect on LED luminance using spread-spectrum techniques are investigated. Spread-spectrum is applied to the system by modifying the switching frequency by providing disturbances at pin IADJ. The disorder is given in the form of four signals, namely square, filtered-square, triangular, and sine disturbance signals. The highest level of the EMI suppression of about 31.89% is achieved when the LED driver is given 800 mVpp filtered-square waveform. The highest reduction power level occurs at fundamental frequency reference, when it is given 700 mVpp square disruption signal, is about 81.77% reduction. The LED luminance level will reduce by 85.2% when it is given the four waveforms disruption signals. These reductions occur as the switching frequency of the LED driver does not work on a fixed frequency, but it varies in certain bands. LED brightness level has a tendency to generate a constant value of 235 lux when it is given the disruption signals. This disturbance signal causes the dimming function on the system that does not work properly. © 2016 Mohammad Yanuar H et al.
Putra E.H.,Politeknik Caltex Riau |
Supriyanto E.,University of Technology Malaysia |
Bin Din J.,University of Technology Malaysia |
Satria H.,University of Technology Malaysia
Proceedings of the 2011 International Conference on Electrical Engineering and Informatics, ICEEI 2011 | Year: 2011
Telemedicine system requires an acceptable network quality of service and cost. IEEE 802.11 wireless LAN technology has been developed to provide scalable and low cost network. For telemedicine application however, the technology does not fulfil the quality of service requirement yet. Therefore, a cross layer design of wireless LAN is proposed to overcome this problem. The cross layer design based on H.264/Scalable Video Coding (SVC) and IEEE 802.11e Wireless Network has been implemented in NS2 simulation environment. The simulation intends to deliver four traffic flows of telemedicine application with different priorities and to assign telemedicine video with QoS guarantee over the proposed cross layer design of wireless LAN. The NS-2 simulation results show that the cross layer design can delivers 99.68 percent of video packets within average delay of 10.66 ms. Thus, this new design has a potential utilized in telemedicine system. © 2011 IEEE.