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7th International Conference on Euro Asia Civil engineering Forum, EACEF 2019

作者： Kiryu, S. Alisjahbana, S.W. Alisjahbana, I. Han, A.L. Gan, B.S. Department of Architecture Graduate School of Engineering Nihon University Koriyama Japan Faculty of Engineering and Informatics Bakrie University Jakarta Indonesia Department of Civil and Environmental Engineering Master Program Student Stanford University CA United States Civil Engineering Department Faculty of Engineering Universitas Diponegoro Semarang Indonesia Department of Architecture College of Engineering Nihon University Koriyama Japan

Orthotropic Levy-type solution plates considering shear deformation were solved by using the Spectral Element Method (SEM). In SEM, the exact solution of structural dynamic related problems can be solved by using the frequency-dependent shape functions. The solutions of SEM are accurate in decreasing the amount of Degree Of Freedoms (DOF) to discard the cost and computational disadvantages in the Finite Element Method (FEM). This study investigates the free vibration problems of orthotropic Levy-type solution plates solutions based on the two variable Refined Plate Theory (RPT). SEM for orthotropic Levy-type solution plates in the frequency domain was formulated to solve free vibration problems. The differential governing equations of the orthotropic plate element in SEM are formulated into the form of transcendental stiffness matrices. The boundary conditions of the spectral element model consist of four edge-type DOFs at each side of the orthotropic Levy-type solution plates. The natural frequencies of the plate are calculated by means of the Wittrick-Williams procedure. The numerical investigations are presented to show the accuracy, efficiency, and effectiveness of SEM without any discretization scheme. © Published under licence by IOP Publishing Ltd.

关键词： Stiffness matrix

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Digital Divide Measurement in Lembata Regency Using SIBIS 2

Digital Divide Measurement in Lembata Regency Using SIBIS

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2nd International Conference on Energy, Environmental and Information System, ICENIS 2017

作者： Gabriel, Cecilia Dai Payon Binti Setyohadi, Djoko Budiyanto Suyoto Informatics Engineering STIMIKOM Stella Maris Sumba Sumba Barat Daya NTT85274 Indonesia Master Program of Informatics Engineering Universitas Atma Jaya Yogyakarta Yogyakarta55281 Indonesia

Along with technological development in Indonesia, digital divide occurs in various regions, which were behind in terms of information on how to use, access and utilize ICT in collecting information from internet. One of the regions is Lembata Regency in East Nusa Tenggara, where digital divide among the people should be measured. The purpose of this study was to determine the level of digital divide among the people of Lembata Regency. To determine the level of digital divide, we used SIBIS GPS (General Population Survey) method, which consisted of several indicators or aspect, i.e. internet usage behavior, internet utilization, and e-government. We also performed two tests, i.e. validity test and reliability test to obtain value of index of digital divide measurement among the people of Lembata Regency. The results of validity test which is processed using SPSS program are categorized valid for each variable indicator and the reliability test results show reliable status. According to the test results on digital discrepancy in Lembata people, the internet usage attitude indicator is categorized low which is 63.1%, the internet usage function indicator is categorized low which is 64%, and the digital discrepancy of e-government indicator is categorized medium which is 40.4%. Therefore, the result of this study because consideration for the government of Lembata Regency in improving ICT services in e-government and in distributing ICT access and ability equally to the people. © 2018 The Authors, published by EDP Sciences.

关键词： Software testing

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Analysis of denial of service attack on web security systems

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Journal of Physics: Conference Series 2021年第1期1811卷

作者： S. Iswandi Walad Muhammad Zarlis M.IT Syahril Efendi Department of Information and Technology Faculty of Computer Science and Information Technology University of Sumatera Utara Medan Indonesia. Master Program (S2) of Informatics Engineering Faculty of Computer Science and Information Technology University of Sumatera Utara Medan Indonesia.

In this study, an analysis of the Web security system from a Denial-of-Service Attack (DoS) with SYN Attack, Ping of Death, Land Attack, Smurf Attack and UDP Flood types. The server computer that will be tested for DoS attacks is a local web server including *** IP: 54.169.71.56, *** IP: 104.152.168.14, *** IP: 156.67.210.132, *** IP: 202.162. 207,101 and *** with IP Address 213.136.83.52 port 80. The attack on the local web server computer was carried out through attacking cloned computers as many as 5 zombie computers and then observing data traffic on each Web server computer. The test results use ping to the local web server computer, where the target web server sends a replay request time out and the check results in the Google Chrome browser are slow to inaccessible conditions. Ping access time the greater the packet, the greater the average time when accessing a local web server with 5,000 packets is 242.68 seconds, 10,000 packets is 310.28 seconds, 20,000 packets are 337.4 seconds, 30,000 packets are 377.2 seconds, 40,000 packets are 398.4 seconds, 50,000 packets are 545.4 seconds and 100,000 packets are above 600 seconds with the condition that the web server will recover after 600 seconds where the system recovery process depends on each local web server.

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Application of factor analysis method to support the users acceptance model of ERP systems implementation

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Journal of Physics: Conference Series 2021年第1期1836卷

作者： W Sardjono J Sudirwan W Priatna G R Putra Information Systems Management Department BINUS Graduate Program -Master of Information Systems Management Bina Nusantara University Jakarta Indonesia – 11480 School of Information Systems Department BINUS Undergraduate Program Bina Nusantara University Jakarta Indonesia 11480 Informatics Engineering Engineering Bhayangkara University Jakarta Raya Indonesia Computer Science Study Program Faculty of Mathematics & Natural Sciences Pakuan University Bogor Indonesia

An e-Commerce company has been using an Enterprise Resource Planning (ERP) system for several years, but is still constrained in its implementation, this is reflected in the number of issue/change request tickets submitted by users who have not been able to reach ideal conditions. To overcome this problem, we need an appropriate reference model, the ERP system user acceptance model in companies. The study conducted factors that influence the level of acceptance of SAP ERP users in the XYZ group to then determine a model that is able to explain practically the level of ERP system user acceptance, which in turn can produce concrete proposals to increase ERP system user acceptance. Research is quantitative descriptive using factor analysis and regression analysis methods. The research method uses a questionnaire with a total of 107 valid respondents coming from 8 company names under the XYZ group in 6 Southeast Asian countries. The conclusion of the study is that there are 24 indicators and 4 factors that influence user acceptance of the SAP ERP system. These four factors are the low contribution of the ERP system, the quality of ERP systems and data, the development of ERP systems, and also the low quality of ERP system supporters. It is hoped that by optimizing the value of the 4 factors, the XYZ group can increase user acceptance of the SAP ERP system so that the system can provide benefits expected by the company to be competitive advantage.

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Beach Topographic Change Analysis Using Multi-temporal UAV Data

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IOP Conference Series: Earth and Environmental Science 2021年第1期799卷

作者： K T Chang H M Fang S S Hsiao C S Li Associate Professor Department of Civil Engineering and Environmental Informatics Minghsin University of Science and Technology Assistant Professor Bachelor's Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Professor Department of Harbor and River Engineering National Taiwan Ocean University Center of Excellence for Ocean Engineering Master Department of Harbor and River Engineering National Taiwan Ocean University

A time-serial topographic change was performed using two kinds of surveying methods, including direct measurement and indirect remote sensing technology for beach topography surveillance. Compared with reference topographic data, the root mean square error was 0.169 m. From May, 2018 to March, 2019, multi-temporal beach topographic change results indicated that the distance between baseline and shoreline varied in the range of −24.82∼9.58 meter, and weekly variates are −3.16∼0.45 m. The UAV technique can be efficiently used to detect topographic change information in the coastal area.

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Covid-19 Series: A rule-based decision support system for analysis behavior of people while working from home

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IOP Conference Series: Materials Science and engineering 2020年第1期1007卷

作者： Henderi Rani Putri Merliasari Harco L.H. S. Warnars Sugiyatno Department of Informatics Engineering University of Raharja Indonesia Master of Information Technology University of Raharja Computer Science Department Graduate Program – Doctor of Computer Science Bina Nusantara University Indonesia Department of Informatics Bhayangkara Jakarta Raya University Indonesia

COVID-19 makes the community must carry out activities such as school, work, and worship at home. However, the long-running activities from home make people experience boredom which can lead to stress. On the other side, the entertainment obtained by the public through smartphones by reading articles by their interests can reduce boredom. This paper proposed a rules-based decision support system to help the people to make choices of their activities from home while COVID-19 e rules-based approach for make an application decision support system. Ruled base used in application to selected process through characteristics following the interests of the community. This decision support system is implemented in mobile web applications. The system can display articles based on interests by questions or statements through the front end system. The results showed that most users of the application in a happy condition while working from home.

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Derivative Free Levenberg-Marquardt Method for Solving Fuzzy Nonlinear Equation

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IOP Conference Series: Materials Science and engineering 2021年第1期1115卷

作者： A U Omesa I M Sulaiman M Mamat M Y Waziri A Shadi M A Zaini Kalfin I Sumiati Department of Mathematics College of Agriculture Zuru Kebbi Nigeria Faculty of Informatics and Computing Universiti Sultan Zainal Abidin Campus Kuala Nerus 22200 Terengganu Malaysia Department of Mathematics Bayero University Kano Nigeria Institute of Engineering Mathematics Universiti Malaysia Perlis Kangar Malaysia Doctor Program of Mathematics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Indonesia Master Program in Mathematics Faculty of Mathematics and Natural Science Universitas Padjadjaran Indonesia

In this paper, we present a derivative-free computational method for solving fuzzy nonlinear equation. Derivative-free technique avoids computing the derivative by generating an estimate to the derivative. This is made possible by inserting the estimate of in Levenberg-Marquardt's method. Numerical experiments are carried out which shows that, the method is efficient.

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Comparative Analysis of Software Quality Model In The Selection of Marketplace E-Commerce

Comparative Analysis of Software Quality Model In The Select...

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International Conference on Information Technology Systems and Innovation (ICITSI)

作者： Rahma Wahdiniwaty Eko Budi Setiawan Deden A Wahab Master of Management Program Universitas Komputer Indonesia Bandung Indonesia Informatics Engineering Universitas Komputer Indonesia Bandung Indonesia

ISBN: (纸本)9781538656945;9781538656938

E-commerce system is very helpful for people in buying and selling transactions. Various existing marketplaces have their advantages and disadvantages. Software quality models can provide an assessment of each e-commerce marketplace system. This research analyzes the results of e-commerce selection by using several software quality models that are implemented with the analytical hierarchy process using Expert Choice tools. The assessment in this research using criteria from a combination of several quality software models to obtain which criteria have the highest percentage value and determine the quality of an e-commerce marketplace system. Each quality model software has different evaluation results from each other. This difference because the assessment criteria between one quality model and another.

关键词： Software quality Analytical models Software reliability Usability ISO Standards

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Hybrid cryptosystem multi-power RSA with N=PmQ and VMPC

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IOP Conference Series: Materials Science and engineering 2020年第1期725卷

作者： U Erdiansyah MKM Nasution Sawaluddin Master Program (S2) of Informatics Engineering Faculty of Computer Science and Information Technology University of Sumatera Utara Medan Indonesia Department of Mathematics Faculty of Mathematics and Natural Sciences University of Sumatera Utara Medan Indonesia

In digital world, data and information is very valuable and much targeted by unauthorized parties. One way to secure messages is cryptography. Cryptography itself is a branch of science in concealing messages. In further development a hybrid cryptosystem was formed which combines symmetrical and asymmetric cryptography, which in this paper uses VMPC and Multi-Power.. The RSA Multi-Power algorithm is an asymmetric algorithm that is excellent at message encryption but requires a long process time because it uses very complicated calculations. While VMPC has advantages in the process with fast time and relatively small size of ciphertext. Here we have analyzed the performance of various variants of RSA that have been hybridized with VMPC and given the results.

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Combination of 3des with dct algorithm in message security

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IOP Conference Series: Materials Science and engineering 2020年第1期725卷

作者： S. Guntur MKM Nasution RW Nasution Master Program (S2) of Informatics Engineering Faculty of Computer Science and Information Technology University of Sumatera Utara Medan Indonesia Department of Mathematics Faculty of Mathematics and Natural Sciences University of Sumatera Utara Medan Indonesia

In the digital era, communication through computer networks plays an important role. Through electronic communication, a person can make transactions or communication very quickly and practically. Sending data / messages from one place to another is much constrained by the issue of confidentiality. There are many ways you can hide data / messages that will be sent. First, using cryptographic techniques, namely by encoding data / messages using certain algorithms. Another technique is to insert a message that will be sent to other media, so that the message will be hidden and what will appear is other media used to insert *** will be performed a Performance Analysis of the Combination of 3DES and DCT Algorithms in Securing Message Files into the Image.

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