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ComTech: Computer, Mathematics and Engineering Applications
Published by Universitas Bina Nusantara
ISSN : 20871244     EISSN : 2476907X     DOI : -
Core Subject : Science, Education, Engineering,
Computer Science & IT Engineering Mathematics
The journal invites professionals in the world of education, research, and entrepreneurship to participate in disseminating ideas, concepts, new theories, or science development in the field of Information Systems, Architecture, Civil Engineering, Computer Engineering, Industrial Engineering, Food Technology, Computer Science, Mathematics, and Statistics through this scientific journal.
Arjuna Subject : -
Articles 1,585 Documents
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Pengaruh Fitur Desain dan Bahasa Terhadap Kepuasan User dalam Proses Belajar Mengajar Pada Universitas di Jakarta Lianawati Christian; Angelina Permatasari; Lianna Sugandi
ComTech: Computer, Mathematics and Engineering Applications Vol. 5 No. 2 (2014): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v5i2.2239

Abstract

This research was conducted at the research object that is engaged in educational services is one of the universities in Jakarta, where do research on features or design variables and the variable satisfaction language on the web that support the teaching and learning process at the college. The purpose of this study was to determine the factors that affect the learning process on the web, as reference material consideration for the leadership of the university in the policy -making to improve the quality quality teaching and learning process. The method used is literature and literature study, questionnaires to the users who use the web are faculty and students, interviews, data processing method with SPSS and Likert scale. The conclusions resulting from this research is the design and navigation of the questionnaire distributed to faculty and students in the first semesterof 2013/2014 with the hypothesis Ho: no effect, Ha: no effect, in which the basic decision making sig. > then Ho isα= accepted , sig . < then Ho is rejected, the decision sig. = 0.00 then 0.00α < 0.05 then there is the influence of language and design variable to variable satisfaction.
Perancangan Program Aplikasi Kriptografi Menggunakan Algoritma Magenta dengan Panjang Kunci 128 Bit Steffie Hugh Wibisono; Djunaidy Santoso
ComTech: Computer, Mathematics and Engineering Applications Vol. 1 No. 1 (2010): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v1i1.2240

Abstract

Along with the development of computer technology, the growing crimes against the computer. Crimes against the computer makes people increasingly competing to make the algorithms-algorithms that can maintain the confidentiality of data. Algorithms algorithm Magenta is one of the many algorithms that exist today. Magenta algorithms have been developed since 1990 by using a simple and transparent technique that can be implemented in hardware and software. First time algorithms are analyzed using the butterfly structure - the structure of the butterfly which was then replaced by a Fast Hadamard Transform (FHT) shuffle structure which has the advantage of providing some structure in each level. In 1994 there was a slight change in the use of hardware that was not processed according to plan so that now the algorithm used by Deutsche Telekom Magenta for secure management of sensitive data with 128-bit key length. These algorithms break the 128-bit key length into 16 blocks with each block containing the 8-bit and one other advantage of this algorithm is the recursive part is calculated repeatedly at each iteration.
Analisis Pengaruh Service Quality dan Sistem Informasi Sekolah terhadap Customer Satisfaction yang Berdampak pada Customer Loyalty Studi Kasus Sekolah Xyz Roni Kurniawan
ComTech: Computer, Mathematics and Engineering Applications Vol. 5 No. 2 (2014): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v5i2.2241

Abstract

Education has a strategic role in preparing qualified future generations. Education has business potential that is reliable and promising, considering the timeless education, as well as the expectations of every parent to their children to have the access to the best education. Evolving world of education today isdemonstrated by the high rate of growth of established schools, especially private schools. Parents today are more savvy and critical in determining the best school for their children, taking into account various aspects, ranging from excellent schools, curriculum, learning systems, the facility to activities that make their children good personality and smart. A more selective attitude that makes private education institutions now have to be more innovative in order to compete. This study was conducted to determine how big the Service Quality and Information Systems School, affect Customer Satisfaction, which will have an impact on Customer Loyalty (Case Study at XYZ School). The study was conducted with data collection techniques in the form of questionnaires toa total of 100 respondents, using descriptive statistical calculations, where the data were analyzed by using electronic data processing methods with the support of SPSS 17.0 To measure the influence of independent variables on the dependent variable, then the path analysis (path analysis) was used. The results showed that the Service Quality and Information Systems School were contributing together, and significant in Customer Satisfaction. Service Quality, Information Systems and Customer Satisfaction of school together contributesignificantly to Customer Loyalty.
The Influence of Limestone And Calcium Hydroxide Addition in Asphalt Concrete Mixture Gunaran Danny; Nasus K. Y.; Josep P. F Napitupulu; Amelia Makmur
ComTech: Computer, Mathematics and Engineering Applications Vol. 7 No. 2 (2016): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v7i2.2242

Abstract

As time passes, flood often occurs in the area of Gunung Sahari, Jakarta Utara. The flood damages concrete asphalt mixture and it needs particular improvement. Therefore, the purpose of this research is to know the effects of the added combination of limestone and calcium hydroxide on concrete asphalt mixture as a filler resistant to flood. Concrete asphalt mixture that filled with the combination of limestone and calcium hydroxide is a mixture that is made with non-uniform aggregat gradations, filler and liquid asphalt mixed and solidified in a heat state. Limestone and calcium hydroxide mixture is used because both materials included in the most numerous sedimentary rock. Concrete asphalt mixture with the filler combination of limestone and calciumhydroxide is made with optimum asphalt 5.4%, one variation level of limestone (15%), and calcium hydroxide (15%), and three variation levels of fillers (5%, 7.5%, and 15%) to get optimum asphalt levels and filler levels that are compatible with flood condition. Based on optimum asphalt 5.4% towards aggregate total weight and combined level of limestone and calcium hydroxide suitable for the conditions, 8.75 % towards fine aggregate weight. The characteristic value of limestone and calcium hydroxide mixture in maximum condition is VIM 4.55%, VMA 18.83%, stability 1031.26 kg and flow 4.93 mm, where the characteristic value meets the established specifications standard by Pekerjaan Umum Bina Marga. From the result, it is showed that the use of the mixture can decrease the value of stability and increase the value of flow, compared with asphalt and filler with normal levels.
Reducing The Operational Stop Time of Hauller Komatsu Hd465-7 by Using the Six Sigma’s Approach in PT X Humiras Hardi Purba
ComTech: Computer, Mathematics and Engineering Applications Vol. 7 No. 2 (2016): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v7i2.2245

Abstract

An operational stop time is a condition where heavy equipment is not working as usual. It is important to avoid this condition since excessive idling wastes an enormous amount of fuel and money. However, the operational stop time of a dump truck Hauller HD465-7 is 2.83 minutes, which is far above the normal standard. This project aims to optimize the improvement of an operational stop time by using a Six Sigma method with optimize plan selection. This will return the operational stop time to the standard range within 1.25 to 1.65 minutes. These steps of define, measure, analyze, improve, and control are applied to the standardization process according to the rules and criteria established by the Six Sigma. The result found that the Six Sigma’s approach which was applied in PT X has reduced the cost from US$1,105,300 to US$963,000 every month. An improvement have been made to matching fleet by combining six fleet of dump trucks at driving speed of 22 km per hour and the average simulated haul distance was 2,000 meters.
Strategy System and Information Technology Planning In PT.Trikarsa Sempurna Sistemindo Muhamad Abdul Holik
ComTech: Computer, Mathematics and Engineering Applications Vol. 6 No. 3 (2015): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v6i3.2246

Abstract

This research is to provide strategic design of information systems/information technology to the PT. Trikarsa Sempurna Sistemindo. With the design of information systems strategy, it is expected that within the next four years (2012-2015) business developments of PT TSS can be supported appropriately by the system and information technology that has been invested in PT TSS. Data in this research is collected through discussion, study and questionnaires. The collected data is then processed using the methodology of Ward and Peppard and supporting tools that generate qualitative analysis of information. From the analysis, it can be concluded that in order to make the achievement of a good business then PT TSS should do three thing. First, improve work efficiency by automating various processes of information management. Second, improve management effectiveness by satisfying the information needs for decision making. Third, improve or enhance the competitiveness of the organization by changing styles and ways of doing business.
Integrating Preventive Maintenance Scheduling As Probability Machine Failure And Batch Production Scheduling Zahedi Zahedi; Ashadi Salim
ComTech: Computer, Mathematics and Engineering Applications Vol. 7 No. 2 (2016): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v7i2.2247

Abstract

This paper discusses integrated model of batch production scheduling and machine maintenance scheduling. Batch production scheduling uses minimize total actual flow time criteria and machine maintenance scheduling uses the probability of machine failure based on Weibull distribution. The model assumed no nonconforming parts in a planning horizon. The model shows an increase in the number of the batch (length of production run) up to a certain limit will minimize the total actual flow time. Meanwhile, an increase in the length of production run will implicate an increase in the number of PM. An example was given to show how the model and algorithm work.
Investment Cost Model in Business Process Intelligence in Banking And Electricity Company Arta Moro Sundjaja
ComTech: Computer, Mathematics and Engineering Applications Vol. 7 No. 2 (2016): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v7i2.2248

Abstract

Higher demand from the top management in measuring business process performance causes the incremental implementation of BPM and BI in the enterprise. The problem faced by top managements is how to integrate their data from all system used to support the business and process the data become information that able to support the decision-making processes. Our literature review elaborates several implementations of BPI on companies in Australia and Germany, challenges faced by organizations in developing BPI solution in their organizations and some cost model to calculate the investment of BPI solutions. This paper shows the success in BPI application of banks and assurance companies in German and electricity work in Australia aims to give a vision about the importance of BPI application. Many challenges in BPI application of companies in German and Australia, BPI solution, and data warehouse design development have been discussed to add insight in future BPI development. And the last is an explanation about how to analyze cost associated with BPI solution investment.
Step Respons Motor DC by Using Compression Signal Method Satrio Dewanto
ComTech: Computer, Mathematics and Engineering Applications Vol. 6 No. 3 (2015): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v6i3.2249

Abstract

Output signal in the form of a step response of a DC motor can be obtained by providing the input signal to the motor in the form of a signal step directly. Step response obtained in this way usually contains a lot of noise. To reduce noise, this research was designed with the aim to get the step response using signal compression method in which the input signal is not a step but a signal with a specific shape given to the motor and if the output signal of the motor is compressed, it will obtain impulse response. Step response of the DCmotor can be obtained by doing the integral to the impulse response. Step response which is obtained using signal compression method will be used to estimate parameters model of DC motor to see the validity of this method. The result of this research shows that the estimated value of the parameters from the step response has value closer to the value of the parameters given to the model of a DC motor. The conclusion of this research is the method of signal compression can be used to obtain the step response of a DC motor model. Further research will be conducted on the actual motor instead of using a mathematical model.
Website Quality To Increase Franchise Marketing Performance Excellent Erwin Halim; Yohannes Kurniawan
ComTech: Computer, Mathematics and Engineering Applications Vol. 7 No. 2 (2016): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v7i2.2250

Abstract

According to Indonesia Association of Service Provider (APJII) survey in 2014, the internet user in Indonesia increased up to around 88 million. This number expresses that the use of the internet to seek business franchise information will increase as well. The increase of internet using should be followed by the quality of franchisor's website. The franchisor's website will relate to system quality, information quality and service quality (DeLone and McLean, 2003). This research uses SEM LISREL to see the loading factors of each indicator impact in variables and website quality variables impact to intention to purchase franchise. The result shows that all variables (System quality, Information Quality, and Service Quality) give significant impact to dependent variable Website Quality.

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