Pengembangan Sistem Informasi Absensi Berbasis Radio Frequency Identification (RFID) Terintegrasi dengan Sistem Informasi Akademik

Kehadiran minimal 75% dalam perkuliahan merupakan syarat untuk dapat mengikuti Ujian Akhir Semester. Permasalahan yang sering terjadi dalam perkuliahan di perguruan tinggi saat ini adalah banyak mahasiswa terlambat dalam menghadiri perkuliahan. Hal ini menimbulkan mahasiswa melakukan tindakan kurang terpuji antara lain melakukan penitipan absen kepada mahasiswa lain sehingga dosen tidak dapat mengetahui jumlah mahasiswa yang hadir sebenarnya. RFID atau Radio Frequency Identification adalah teknologi yang memungkinkan pelacakan dan identifikasi objek dan makhluk hidup menggunakan gelombang radio. Tidak seperti teknologi bar-code, teknologi RFID tidak memerlukan kontak atau garis-sight (Akintola K.G, 2011). Tujuan penelitian ini adalah Mengembangkan teknologi informasi dan komunikasi yang berhubungan dengan pemodelan dan aplikasi sistem informasi menggunakan Radio Frequency Indentification (RFID) dan melakukan desain Sistem Informasi Absensi yang terintegrasi dengan Sistem Informasi Akademik. Metode yang digunakan dalam pengembangan sistem adalah Prototyping dengan alat bantu perancangan sistem antara lain Context Diagram, Data Flow Diagram, Entity Relationship Diagram dan implentasi aplikasi menggunakan bahasa pemrograman PHP. Hasil dari penelitian ini adalah desain sistem secara umum, terinci, desain database dan aplikasi Absensi dengan RFID yang terintegrasi dengan Sistem Informasi Akademik. Indikator keberhasilan penelitian ini jika lolos uji blackbox dan RFID dapat terintegrasi dalam aplikasi serta berjalan dengan baik dalam browser

Sensor enclosures: example application and implications for data coherence

Sensors deployed in natural environments, such as rivers, beaches and glaciers, experience large forces and damaging environmental conditions. Sensors need to be robust, securely operate for extended time periods and be readily relocated and serviced. The sensors must be housed in materials that mimic natural conditions of size, density, shape and roughness. We have developed an encasement system for sensors required to measure large forces experienced by mobile river sediment grains. Sensors are housed within two discrete cases that are rigidly conjoined. The inner case exactly fits the sensor, radio components and power source. This case can be mounted within outer cases of any larger size and can be precisely moulded to match the shapes of natural sediment. Total grain mass can be controlled by packing the outer case with dense material. Case design uses Solid-WorksTM software, and shape-matching involved 3D laser scanning of natural pebbles. The cases were printed using a HP DesignjetTM 3D printer that generates high precision parts that lock rigidly in place. The casings are watertight and robust. Laboratory testing produces accurate results over a wider range of accelerations than previously reported

A robust digital image watermarking using repetition codes against common attacks

Digital watermarking is hiding the information inside a digital media to protect for such documents against malicious intentions to change such documents or even claim the rights of such documents. Currently the capability of repetition codes on various attacks in not sufficiently studied. In this project, a robust frequency domain watermarking scheme has been implemented using Discrete Cosine Transform (DCT). The idea of this scheme is to embed an encoded watermark using repetition code (3, 1) inside the cover image pixels based on Discrete Cosine Transform (DCT) embedding technique. The proposed methods have undergone several simulation attacks tests in order to check up and compare their robustness against various attacks, like salt and pepper, speckle, compress, Gaussian, image contrast, resizing and cropping attack. The robustness of the watermarking scheme has been calculated using Peak Signal-To-Noise Ratio (PSNR), Mean Squared Error (MSE) and Normalized Correlations (NC). In our experiments, the results show that the robustness of a watermark with repetition codes is much better than without repetition code

An innovative mobile application for construction programme managers

Construction programme management is a complex and information-intensive environment. The construction programme management team requires access to construction information in real-time and when needed. The current increasing use of mobile devices offers an opportunity to meet this need. The efficient management of construction programmes is one of the major factors for improving stakeholders’ satisfaction. An innovative tool is needed in accessing the right information at the right time, especially when spontaneous and urgent decision-making is needed. To this end, the innovative use of a mobile device in delivering information and services to the management team in real-time and based on their current context offers significant benefits. This paper discusses context-aware computing, the enabling technologies for geolocation and the development of a prototype, mobile, context-aware application for construction programme management. The prototype system developed is based on the findings from an earlier study of user requirements which showed that the ability to provide relevant information and services at an appropriate time and at the most appropriate location has the potential to improve the monitoring and control of construction programmes. The prototype system demonstrates the provision of context-specific information and services to construction programme managers using a mobile device. The benefits and limitations of the proposed approach are discussed and conclusions drawn about the potential impact of enhanced information delivery for the efficiency of the construction programme managers

Spatial Identification Methods and Systems for RFID Tags

Disertační práce je zaměřena na metody a systémy pro měření vzdálenosti a lokalizaci RFID tagů pracujících v pásmu UHF. Úvod je věnován popisu současného stavu vědeckého poznání v oblasti RFID prostorové identifikace a stručnému shrnutí problematiky modelování a návrhu prototypů těchto systémů. Po specifikaci cílů disertace pokračuje práce popisem teorie modelování degenerovaného kanálu pro RFID komunikaci. Detailně jsou rozebrány metody měření vzdálenosti a odhadu směru příchodu signálu založené na zpracování fázové informace. Pro účely lokalizace je navrženo několik scénářů rozmístění antén. Modely degenerovaného kanálu jsou simulovány v systému MATLAB. Významná část této práce je věnována konceptu softwarově definovaného rádia (SDR) a specifikům jeho adaptace na UHF RFID, která využití běžných SDR systémů značně omezují. Diskutována je zejména problematika průniku nosné vysílače do přijímací cesty a požadavky na signál lokálního oscilátoru používaný pro směšování. Prezentovány jsou tři vyvinuté prototypy: experimentální dotazovač EXIN-1, měřicí systém založený na platformě Ettus USRP a anténní přepínací matice pro emulaci SIMO systému. Závěrečná část je zaměřena na testování a zhodnocení popisovaných lokalizačních technik, založených na měření komplexní přenosové funkce RFID kanálu. Popisuje úzkopásmové/širokopásmové měření vzdálenosti a metody odhadu směru signálu. Oba navržené scénáře rozmístění antén jsou v závěru ověřeny lokalizačním měřením v reálných podmínkách.The doctoral thesis is focused on methods and systems for ranging and localization of RFID tags operating in the UHF band. It begins with a description of the state of the art in the field of RFID positioning with short extension to the area of modeling and prototyping of such systems. After a brief specification of dissertation objectives, the thesis overviews the theory of degenerate channel modeling for RFID communication. Details are given about phase-based ranging and direction of arrival finding methods. Several antenna placement scenarios are proposed for localization purposes. The degenerate channel models are simulated in MATLAB. A significant part of the thesis is devoted to software defined radio (SDR) concept and its adaptation for UHF RFID operation, as it has its specialties which make the usage of standard SDR test equipment very disputable. Transmit carrier leakage into receiver path and requirements on local oscillator signals for mixing are discussed. The development of three experimental prototypes is also presented there: experimental interrogator EXIN-1, measurement system based on Ettus USRP platform, and antenna switching matrix for an emulation of SIMO system. The final part is focused on testing and evaluation of described positioning techniques based on complex backscatter channel transfer function measurement. Both narrowband/wideband ranging and direction of arrival methods are validated. Finally, both proposed antenna placement scenarios are evaluated with real-world measurements.

Fast splitting based tag identification algorithm for anti-collision in UHF RFID System

Efficient and effective objects identification using Radio Frequency Identification (RFID) is always a challenge in large scale industrial and commercial applications. Among existing solutions, the tree based splitting scheme has attracted increasing attention because of its high extendibility and feasibility. However, conventional tree splitting algorithms can only solve tag collision with counter value equals to zero and usually result in performance degradation when the number of tags is large. To overcome such drawbacks, we propose a novel tree-based method called Fast Splitting Algorithm based on Consecutive Slot Status detection (FSA-CSS), which includes a fast splitting (FS) mechanism and a shrink mechanism. Specifically, the FS mechanism is used to reduce collisions by increasing commands when the number of consecutive collision is above a threshold. Whereas the shrink mechanism is used to reduce extra idle slots introduced by FS. Simulation results supplemented by prototyping tests show that the proposed FSA-CSS achieves a system throughput of 0.41, outperforming the existing UHF RFID solutions

A Software Defined Radio Platform with Direct Conversion: SOPRANO

A new software defined radio platform with multiport-based direct conversion is proposed, named SOPRANO (Software Programmable and Hardware Reconfigurable Architecture for Network). The main features of SOPRANO are a high-level design methodology for digital circuits, a new mixer-less direct conversion method, and software algorithms for multi-band and multi-mode operation. We built the first prototype SOPRANO 1.0, which was able to receive PSK and QAM signals with two different carrier frequencies at 2.45 GHz and 5.25 GHz by changing signal processing software

Penerapan Teknologi RFID pada Sistem Monitoring Antrean Parkir di Universitas Amikom Yogyakarta

Sistem pendataan antrean parkir yang masih manual dimana, pendataan identitas para civitas akademik dan nomor plat kendaraan masih dicatat pada lembaran kertas pada proses keluar masuk kendaraan, sehingga mengakibatkan lamanya antrean dan menyebabkan jalur antrean terjadi kemacetan, maka perlu melakukan perancangan sistem layanan parkir untuk pendataan identitas dan nomor plat kendaraan dengan menggunakan Radio Frequency Identification (RFID),dengan menerapkan model antrean single channel single phase dan multichannel single phase dan menggunakan metode prototyping. Tujuan dari penelitian yang dilakukan ini adalah untuk mengurangi waktu tunggu pendataan antrean, sehingga tidak terjadi kemacetan di jalur antrean. sistem pendataan dengan model single channel single phase yang konvensional harus memakan waktu 53 detik, sedangkan sistem pendataan antrean parkir yang terintegrasi dengan RFID memakan waktu cuma 2 detik, sedangkan sistem pendataan antrean dengan model multichannel single phase yang konvensional, memakan waktu 44 detik dan yang menggunakan RFID memakan waktu 2 detik. hasil uji coba Menunjukkan bahwa pendataan antrean parkir lebih cepat jika menggunakan model antrean multichannel single phase