Browsing by Author "Galih, Savitri"

Now showing 1 - 14 of 14
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    APLIKASI DIAGNOSA PENYAKIT UNTUK BALITA BERBASIS MOBILE
    (Konferensi Nasional Sistem Informasi (KNSI) 2013, STMIK BUMIGORA MATARAM, 2013-02-14) Galih, Savitri
    Penduduk pedesaan yang merupakan daerah dengan jumlah penduduk paling besar di Indonesia memiliki tingkat kesehatan yang rendah akibat sukarnya akses pada informasi kesehatan serta jauhnya lokasi institusi kesehatan terdekat. Penggunaan perangkat mobile yang mengalami peningkatan signifikan termasuk di kalangan penduduk daerah pedesaan dapat meberikan kontribusi positif untuk meningkatkan aksed informasi dan layanan kesehatan. Pada paper ini dibahas perancangan dan implementasi aplikasi diagnosa penyakit untuk balita berbasis mobile untuk memungkinkan pasien dapat bertindak sesuai dengan langkah-langkah yang tepat dalam mengatasi gejalagejala atau keluhan yang dirasakannya.
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    CLOUD COMPUTING APPROACH FOR IT COST REDUCING IN INDONESIA GOVERNMENT‘S E-PROCUREMENT SYSTEM : Case Study Jawa Barat e-Procurement System Unit (LPSE Jabar Indonesia )
    (State Islamic University Sunan Kalijaga, Yogyakarta, 2011-11-26) Galih, Savitri
    Abstract— The development of “eSomething” takes place in almost all government sector, include Indonesia Government. One of electronic based system developed recently in Indonesia is e-procurement system. This condition bring much higher financial requirement and qualified Ihuman resources to build the IT infrastructure. We proposed cloud computing scheme architecture for e-procurement system in Indonesia (Jawa Barat) to reduc the IT cost for implementing the e-procurement system. The ROI analysis is carried out to select which cloud scheme is best to apply in Indonesia condition. We also propose the architecture of the new cloud based system based on the analysis conducted. The analysis result show that a significant cost reducing is achieved by implementing Infrastructure as a Service scheme cloud computing in e-procurement system at Jawa Barat Indonesia. Keywords-cloud computing, e-procurement, IaaS
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    A Comparative Study of Channel Estimation Based on Symbol Source of Pilot for Downlink OFDMA System on IEEE 802.16e Standard
    (Pusat Penelitian Institut Teknologi Telkom, 2009-06) Galih, Savitri; Karlina, Riafeni; Nugroho, Fifin; Adiono, Trio; Kurniawan, Adit
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    FOLDING MEMORY SHARED PROCESSOR ARRAY (FMSPA) ARCHITECTURE FOR CHANNEL ESTIMATION OF DOWNLINK OFDMA IEEE 802.16E SYSTEM
    (IEEE Computer Sociaty and University of Bedfordshire, 2011-04-04) Galih, Savitri; Adiono, Trio; Iskandar
    Abstract—The implementation of complex signal processing algorithms are required to achieve robust transmission, whereas mobile wireless application require low power dissipation. This paper describes an algorithm and a corresponding hardware architecture for the implementation of OFDMA 802.16e channel estimation. The advantage of the proposed architecture are low power and efficient resource utilization since we use iterative memory shared architecture that exploits reutilization of the processor elements and memory units. The higher data access scheme is utilized by scheduled memory sharing with common bus. Furthermore, we increase parallel efficiency by folding the architecture to reduce the number of processor elements.
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    HIGH MOBILITY DATA PILOT BASED CHANNEL ESTIMATION FOR DOWNLINK OFDMA SYSTEM BASED ON IEEE 802.16E STANDARD
    (The society of Instrument and Control Engineers. The Institute of Control, Robotics and Systems., 2009-08-18) Galih, Savitri; Karlina, Riafeni; Nugroho, Fifin; Irawan, Ade
    High mobility communication systems need suitable channel estimation to cope high frequency selectivity channel effect. In this paper we propose data pilot based channel estimation in downlink OFDMA for IEEE 802.16e standard (Mobile WiMAX). The Mobile WiMAX channel estimation can be done by exploiting pilot from preamble, in this paper we obtain channel transfer function by exploiting pilot at symbol data with two dimensial interpolation scheme. Based on our simulation, it can be shown that the proposed method have better performance compare with preamble based channel estimation method. Afterwards we compare Linear Interpolation and MMSE interpolation for proposed channel estimation method. The Symbol Error Rate for QPSK and 64 QAM system is presented by means of simulation.
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    ITERATIVE MEMORY SHARED PROCESSOR ARRAY (MSPN ARCHITECTURE DESIGN FOR CHANNEL ESTIMATION OF DOWNLINK OFDM IEEE 802.16A SYSTEM
    (International Journal of Computer Science and Network Security, 2011-10-30) Galih, Savitri; Adiono, Trio; Kurniawan, Adit; Iskandar
    WiMAX communication system has spectrum alocation that enable wireless service operator to operate throughout the world including the rural area. WiMAX is suitable for development country condition, where wiring infrastructures are limited. This advantages make WiMAX become a desirable future wireless technology that can be implemented in an developed archipelago country like Indonesia. WiMAX Communication System needs accurate channel estimation process to predict fluctuative channel condition in order to equalize received signal with the transmitted signal. Channel Estimation recent studies, mostly analyzed the algorithm side without considering implementation issue. The hardware implementation of complex signal processing algorithm such as MMSE(Minimum Mean Square Error) chamel estimation with high computational complexity. are required to achieve robust trasmission, whereas mobile wireless aplication require low power dissipation. Therefore we need an algorithm mapping method to the corresponding hardware architecture that practically fits with overall system hardware. The proposed architecture aims to achieve low power and efficient resource utilization by using iterative memory shared architecture.
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    LESSONS LEARNED TO INCREASE THE DIGITAL STARTUPSSUCCESS RATE
    (Journal of Advanced Research in Dynamical & Control Systems, Vol. 11, 03-Special Issue, 2019) Mukti, Iqbal Yulizar; Wibowo, Ari Purno Wahyu; Galih, Savitri
    Purpose:The purpose of this paper is to explore the lessons learned to increase the startups’ success rate based on a case study in Selurup, a digital startup worked on food delivery services. Design/methodology/approach: To systematically identify the lessons learned, and this paper adopts the hypothesis-driven entrepreneurship framework. Guides by research questions described in the introduction section, the lessons learned are elaborated by using interviews with the co-founder. Findings: Research in this paper, ultimately suggest the emerging digital startups to follow the hypothesis-driven entrepreneurship framework as the structured approach to face the extreme uncertainty that typically faced by the startups. Research limitations/implications: Research in this paper explores the lessons learned only from one startup. Consequently, the lesson learned might not represented all the startups in Indonesia. Practical implications: It is expected that the lessons learned from this research can give positive contribution to increase the emerging digital startups success rate. Originality/value: This study academically explores the lesson learned especially from the emerging digital startups, following the hypothesis-driven entrepreneurship framework.
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    LOW COMPLEXITY MMSE CHANNEL ESTIMATION BY WEIGHT MATRIX ELEMENTS SAMPLING FOR DOWNLINK OFDMA MOBILE WIMAX SYSTEM
    (IJCSNS : DAE-SANG OFFICE 301, SANGDO 5 DONG 509-1, DONGJACK GU, SEOUL - 156-741 KOREA, 2010-02) Galih, Savitri; Adiono, Trio; Kurniawan, Adit
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    LOW COST IMPLEMENTATION FOR SYNCHRONIZATION IN DISTRIBUTED MULTI ANTENNA USING USRP/GNU-RADIO
    (2014 1st International Conference on Information Technology, Computer and Electrical Engineering (ICITACEE), Department of Electrical Engineering Diponegoro University, 2014-11-08) Galih, Savitri; Hoffmann, Marc; Kaiser, Thomas
    Carrier Frequency Offset Synchronization is play a very important rule in the Distributed Multi antenna system, since the system has different individual clock instead of common clock as in the centralized multi Antenna system. One of the established synchronization methode for different transmitter devices is Costas Loop. Some implementation of the synchronization for distributed multi antenna is discussed in some research works. In this paper we propose the low cost implementation of synchronization in distributed multi antenna and more simplified measurement method of synchronization in distributed multi antenna. The measurement result showed that the syncronization can compensate 0.5 kHz frequency offset experienced by the transmitters in the Distributed Multi antenna system
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    MOBILE CLOUD BASED LEARNING MATERIAL REPOSITORY USING ANDROID AND GOOGLE DRIVE APPLICATION
    (Asia Pasific University of Techonology and Innovation Malaysia, 2013-03-04) Galih, Savitri
    ABSTRACT With the increase of people mobility in the globalization era, learning activity is tending to be more ubiquitous. To expand the communication between the teachers and the learners further than in class activity, mobile learning has been implemented in many learning system in the world in the recent days. Nevertheless, m-learning applications have some drawbacks, mainly in term of limited storage that driven limited resources to provide in education processes. To solve the problem, cloud enabled m-learning applications are proposed. This paper presents the existing applications of cloud based mobile learning applications, explores the advantages of using cloud enabled m-learning and design a low cost and low complexity cloud based m-learning application architecture. We deploy Google Drive API in android application that allows users to access teaching learning materials in the cloud. KEYWORDS Cloud based mobile learning, android, Google drive, cloud storage
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    MOBILE QUIZ APPLICATION FOR ENHANCING ANYTIME ANYWHERE LEARNING ACTIVITY
    (Association the Advancement of Computing in Education, 2011-03-28) Rachmaningrum, Nilla; Galih, Savitri; Sodiq, Mohamad
    ABSTRACT We have developed a mobile quiz system on cell phone to assist learning anytime and anywhere. In this paper we present about the quiz system in mobile learning we developed for enhancing student learning process in Network Security lecture. We also have polled university students regarding their use of mobile devices. After the implementation of the mobile quiz system, the evaluation strategies were conducted to rate users’ satisfaction and applicatiin achievement Keywords: mobile learning, mobile quiz, J2ME application, SMS application
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    PROTOTYPE OF M-REGISTRATION APPLICATION (MOBILE-STUDENT REGISTRATION) USING JAVA MICROEDITION (J2ME) Case Study : Widyatama University, Bandung, Indonesia
    (State Islamic University Sunan Kalijaga, Yogyakarta, 2011-11-26) Rachmaningrum, Nilla; Galih, Savitri; Sodiq, Mohamad
    Abstract—Now, in every beginning of semester, Widyatama University Bandung students, carry on the student registration manually. This condition become complicated for many students, since a lot of them returned to their hometown during registration date. We developed mobile registration application using Java Microedition (J2ME) Platform to make registration process easier and faster. They can access it directly from their own hand set anywhere, anytime. This application consist of user interfface for input all required data for registration process and then the application enable for sending the data have been inputed via sms. Keywords- m-registration, J2ME, SMS, Mobile application, M-education
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    SMS GATEWAY AS AN APPROACH FOR CREATING A MOBILE LEARNING SYSTEM : A PRE-DESIGN STUDY AT INFORMATICS DEPARTEMENT WIDYATAMA UNIVERSITY
    (2010-05-17) Galih, Savitri; Rachmaningrum, Nilla
    The widespread use of mobile phone enables the use of mobile devices for educational purpose. The short message service (SMS) is a popular method of communication among the younger generation.With today’s tools, instructors often encounter obstacles when trying to interact with the entire class. Instructors can get responses from only some of students and always struggle with repeating announcements or directing students where to download materials. To solve these problems, we propose the use of the short message service or SMS to support teaching learning activity which greatly enhances interactions between instructors and students and will create a much more effective education environment. The system will provide functions like instant quiz, class material distribution, announcement posting, notifying instructor through short message service (SMS). The SMS based method is chosen based on the analysis on a survey done at Informatics Department Widyatama University. From the survey we conclude that this method is suitable with the mobile learning readiness and learning trends among the students.
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    WIRELESS SYNCHRONIZATION AND INTERFERENCE ALIGNMENT WITH LIMITED INTERFERER FOR DISTRIBUTED LARGE SCALE MULTI USER MIMO
    (Computer Science and Electronic Engineering Conference (CEEC) 2015, University of Essex, IEEE, 2015-09-24) Galih, Savitri; Mohammed El-Absi; Marc Hoffmann; Thomas Kaiser
    Large Scale (Massive) MIMO enhances the advantages of the conventional MIMO in terms of data rate, energy efficiency and reliability. To increase the scalability of conventional massive MIMO, the distributed large scale MIMO is recommended. Synchronization for distributed large scale MIMO is needed due to the lack of common clock source to synchronize the transmitters. Limited Inter-User Connected Interference Alignment for K-User is proposed for Large Scale MU-MIMO precoding scheme. Moreover, we discuss phase rotation factor estimation and compensation to synchronize the distributed large scale MIMO. The Interference Alignment algorithm with antenna selection also employed to show the effect of the synchronization in distributed large scale MIMO performance.