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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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Dampak Sistem Penghawaan dan Pencahayaan terhadap Sick Building Syndrome Daryanto, Daryanto
ComTech: Computer, Mathematics and Engineering Applications Vol 4, No 2 (2013): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v4i2.2676

Abstract

Activities of office workers are most spent indoors. Unwittingly office buildings and enclosed spaces with air conditioning system usually do not have good ventilation and allow natural lighting. This condition may cause sick building syndrome (SBS). It is a collection health issues arising in relation to the time spent in a building and the air quality. A study was conducted through a literature review and field observations to obtain the impacts of SBS, as well as the prevention and solution of architectural aspects. From the results of the study, it was obtained that printer, computer, cigarette smoke, building materials, etc., gave rise to free radicals. Theair polluted by free radicals may cause medical problems such as headaches, eye irritation, quickly tired and weary body, runny nose, itchy throat, difficulty in concentrating, dry skin and dry cough. This research is expected to improve the quality of life of workers that can be started from the improved quality of health.
Penerapan Ukuran Ketepatan Nilai Ramalan Data Deret Waktu dalam Seleksi Model Peramalan Volume Penjualan PT Satriamandiri Citramulia Sungkawa, Iwa; Megasari, Ries Tri
ComTech: Computer, Mathematics and Engineering Applications Vol 2, No 2 (2011): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v2i2.2813

Abstract

Forecasting is performed due to the complexity and uncertainty faced by a decision maker. This article discusses the selection of an appropriate forecasting model with time series data available. An appropriate forecasting model is required to estimate systematically about what is most likely to occur in the future based on past data series, so that errors (the differences between what actually happens and the results of the estimation) can be minimized. A gauge is required to detect the required the value of forecast accuracy. In this paper ways of forecasting accuracy of detection are discussed using the mean square error (MSE) and the mean absolute percentage error (MAPE). The forecasting method uses Moving Average, Exponential Smoothing, and Winters method. With the three methods forecast value is determined and the smallest value of MSE and Mape is selected. The results of data analysis showed that the Exponential Smoothing is considered an appropriate method to forecast the sales volume of PT Satriamandiri Citramulia because it produces the smallest value of MSE and Mape. 
Penggabungan Konsep Web 2.0 dan Mashup dalam Pembuatan Situs Dinas Kebudayaan dan Pariwisata Provinsi DKI Jakarta Kanigoro, Bayu; Moniaga, Jurike V; Priatama, Rhezandra; Pratomo, Konrad Bangun; Adityo, Dimas Eko
ComTech: Computer, Mathematics and Engineering Applications Vol 2, No 1 (2011): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v2i1.2709

Abstract

This study aims to design a website of the Jakarta regional office of Culture and Tourism by combining the concept of web 2.0 and mashup. This concept combines several APIs (Application Programming Interface) into a new application. The APIs used are Facebook, Google Maps, Twitter, and Yahoo Weather. The created site applies the latest technology and advanced multimedia elements. With the combination of all elements above, a more interactive and dynamic site is succesfully obtained. 
Analisis dan Perancangan Sistem Informasi Eksekutif Pemasaran pada Distributor Alat Tulis Kantor: Studi Kasus pada Benza Prima Subekti, Mohammad; Widjaya, Raden Bagus Rhesa Dharma; Heriyanni, Eileen; Dewi, Giovani
ComTech: Computer, Mathematics and Engineering Applications Vol 2, No 2 (2011): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v2i2.2847

Abstract

Executive information system (EIS) has been widely used in enterprises and institutions to help the executives make decisions quickly and accurately for the organization's business needs. A research is conducted to create a marketing executive information system that can produce analytic reports and comparison reports for the executive of Benza Prima. For information search the fact finding techniques is utilized by conducting surveys directly to the company to study the company needs and the running procedures. The executive information system design uses Object Oriented Analysis and Design (OOAD) methodology. The research results in an executive information system that produces report in forms of pivot tables and charts to help the Benza Prima executives make decisions. The marketing executive information system design is expected to provide analytic information that can be used by the Benza Prima executive as an analytic tool in planning marketing strategies. 
The Proposed Maintenance Task for Plastic Injection Machine Using Reliability and Risk Centered Maintenance (RRCM) method in Manufacturing Industry Maulidina, Liza Nafiah; Atmaji, Fransiskus Tatas Dwi; Alhilman, Judi
ComTech: Computer, Mathematics and Engineering Applications Vol 10, No 2 (2019): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v10i2.5900

Abstract

The objective of this research was to determine the optimal maintenance time interval for the selected critical components and the total cost of maintenance of a plastic injection machine. In determining the critical components, a risk matrix was used, and three components were selected, namely, hydraulic hose, barrel, and motor. Using the Reliability and Risk Centered Maintenance (RRCM) method, the researchers got a proposed maintenance policy and the total maintenance cost. Based on the result, it shows that there are seven proposed maintenance tasks with three scheduled oncondition tasks and four scheduled restoration tasks with an average maintenance interval of two months. The total maintenance cost proposed is IDR91.595.318. The cost is smaller compared to the actual maintenance costs of the company.
Information Technology (IT) Improvement At PT. Sumber Alfaria Trijaya Karsen, Marisa
ComTech: Computer, Mathematics and Engineering Applications Vol 4, No 1 (2013): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v4i1.2744

Abstract

Retail industry is the second largest industry after agricultural industry in terms of employment absorption in Indonesia. The situation of the quite dynamic retail industry is marked by the development of modern retail trade and it impacts on traditional markets and suppliers. PT Sumber Alfaria Trijaya, known as Alfamart is one of the best retail company  in Indonesia. It already uses Supply Chain Management and B2B to support their operations. Alfamart also has its own website which provides information about products, outlets, services, and promo. This research discusses about IT improvement. The purpose of this paper is to improve Alfamart IT performance and make innovation on the IT to increase customer satisfaction.  The methodology used is defining the problem, measure, analyst problem, improvement required by Alfamart, and control to monitor the implementation. Problems are identified using SWOT analysis, problem clarification, and business model canvas. Analyzing the problems, solution hypotheses and IT improvement are recommended for Alfamart.  
Konsep Arsitektur Tradisional Sunda Masa Lalu dan Masa Kini Suharjanto, Gatot
ComTech: Computer, Mathematics and Engineering Applications Vol 5, No 1 (2014): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v5i1.2644

Abstract

It is known that traditional architectures are a product of human conception full of culture and philosophy, while modern architectural concepts prioritize functionality and simplicity that tends to be simple or quick. Now the architectural concept slowly changes according to the conditions of time, then so is the existence of works of architecture that also changes. This condition can be found in almost major cities in Indonesia, where many houses or buildings built still in traditional architecture theme but combined and matched with modern architecture concept. One of many diverse cultures of Indonesia archipelago architecture that has evolved is West Java. There are a lot of people trying to apply the concept of Sundanese traditional house in their residence. Shifting sacred values in traditional concept seems indeed to be lost along with the differences in modern human civilization.
Dasar Laut Sinusoidal Sebagai Reflektor Gelombang Noviantri, Viska
ComTech: Computer, Mathematics and Engineering Applications Vol 2, No 1 (2011): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v2i1.2781

Abstract

This article discusses about the influence of sinusoidal sandbars towards the amplitude of incident wave. sinusoidal sandbars may lead to Bragg resonance. Basically, when a wave meets a different depth, it will scatter into a transmitted wave and a reflected wave. Bragg resonance happens when the wavelength of incident wave is twice of the wavelength of the periodic bottom disturbance. We apply the multi-scale asymptotic expansion to obtain the results. Eventually we find that a larger amplitude disturbance leads to larger reflected wave amplitude. This result explains that the sinusoidal sandbars indeed can reduce the amplitude of incident wave and protect a beach from large amplitude incident waves. 
Implemetasi Data Warehouse pada Bagian Pemasaran Perguruan Tinggi Miranda, Eka; Rudy, Rudy; Suryani, Eli
ComTech: Computer, Mathematics and Engineering Applications Vol 3, No 1 (2012): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v3i1.2417

Abstract

Transactional data are widely owned by higher education institutes, but the utilization of the data to support decision making has not functioned maximally. Therefore, higher education institutes need analysis tools to maximize decision making processes. Based on the issue, then data warehouse design was created to: (1) store large-amount data; (2) potentially gain new perspectives of distributed data; (3) provide reports and answers to users? ad hoc questions; (4) perform data analysis of external conditions and transactional data from the marketing activities of universities, since marketing is one supporting field as well as the cutting edge of higher education institutes. The methods used to design and implement data warehouse are analysis of records related to the marketing activities of higher education institutes and data warehouse design. This study results in a data warehouse design and its implementation to analyze the external data and transactional data from the marketing activities of universities to support decision making.
Analisis dan Perancangan Aplikasi E-Meeting Berbasis Web Lina, Yen; Alfasan, Sebastian Karuna
ComTech: Computer, Mathematics and Engineering Applications Vol 4, No 2 (2013): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v4i2.2667

Abstract

Information technology is closely related to wide area networks. BINUS University pays much attention to the development of information technology. Yet, it has not applied all concepts of information technology. There are still activities carried out conventionally such as meeting activity. This is the main attraction of the authors to implement a new system. The purpose of this research is to analyze and design an e-meeting application of Computer Science Department of BINUS University. By using this application, user will be easyto conduct meeting without location barrier. This research is using analysis method on literacy study, as well as analysis on current meeting process through interview with expert and user to detect current problem. Design method usies software engineering concept, by Unified Modeling Language and Entity Relationship Diagram. UML notation explains the overview and the detail of e-meeting system. Relational database explains data structure used in this system. The result of this research is a development of e-meeting web based application to help improve meeting activity to be more effective and efficient. E-meeting application has many helpful features as used in regular meeting, as well as administration panel to control and manage user of this application.

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