Gitar merupakan salah satu alat musik yang paling digemari, dan dapat dimainkan oleh semua orang. Saat ini masih banyak ditemukan pengguna gitar yang tidak bisa melakukan tuning senar gitar dan jika dilakukan manual juga membutuhkan waktu yang lama untuk mendapatkan hasil tuning yang akurat. Hal ini dapat diatasi dengan perkembangan teknologi Pengguna gitar sekarang ini dapat melakukan tuning senar lebih mudah dan lebih cepat dengan tingkat toleransi kesalahan frekuensi tuning ± 1 Hz dengan menggunakan tuner gitar otomatis.Perancangan alat tuner gitar otomatis ini menggunakan 5 komponen pembentuk alat yaitu selector switch untuk memilih frekuensi yang akan diatur, Op amp untuk menguatkan amplitudo gelombang suara agar diterima arduino dengan baik, Arduino untuk menginisialisasi frekuensi dan memberi sinyal ke motor servo, Motor servo untuk melakukan tuning senar gitar, dan LED sebagai indikator tuning.Hasil dari penelitian ini adalah keakuratan tuning untuk setiap senar didapatkan rata-rata tuning paling baik yaitu senar 5 dengan rata-rata kesalahan tuning 0,07 Hz dan rata-rata tuning paling buruk yaitu senar 1 dengan rata-rata kesalahan tuning sebesar 0,8 Hz. Alat yang dapat membantu pengguna gitar melakukan tuning senar gitar secara otomatis dengan tingkat kesalahan maksimum ± 1 Hz dari standar frekuensi setiap nada senar gitar yang telah ditetapkan.
Based on the observations conducted to the students of Diploma of Telecommunications Engineering Telkom University. It revealed that the students have difficulty learning and understanding the chapters of call processing and network optimization in the course of cellular communication systems. It has resulted from the current learning media, which are only in the form of textbooks and Powerpoint slides considered less attractive. Hence, the learning process becomes ineffective and has an impact on low learning outcomes. In this study, an interactive learning media was designed with the Multimedia Development Life Cycle (MDLC) method, Adobe Flash professional CS6 software, using the action script 2.0 programming language. Learning media were designed according to users’ needs and learning outcomes of cellular communication system courses. Based on the testing results, the functionality showed 100% of features function as design specifications. Meanwhile, the user satisfaction testing results obtained an average MOS of 4.73, which means that the learning media is classified great. Furthermore, based on the quantitative testing, the average value of Quiz after using this interactive learning media was 81, which means that the learning media can increase students’ interest so that it affects the increase in learning outcomes by 66% from previous years.
At present, the need for internet access in public area using wireless connections is increasing drastically and this should be supported by good network infrastructure. Wireless network is one of the best alternative in building a practical internet network. WDS is a system to develop wireless internet network without having to use cable as its backbone for access point but instead utilize wireless path from its access point. The problems that often arise in the design of wireless LAN network is the poor signal received by the user due to the installation of an access point that is poor location-wise. This is because at some point it is very difficult to install Access point using cable because the distance is too far from the existing router. In this paper, we propose to use three scenario of WDS mode to compare its performance. We investigate three different topology policy models of the WDS Bridge point-to-point, WDS Bridge point to multipoint and WDS repeater. The use of these three topologies aims to reach locations that are not covered by wireless LAN network, in addition this method can save the use of network resources such as LAN cables. Based on the simulation results, it is found that the topology point to point gives better value but it generated higher delays. The delay generated on point to point is higher than other topologies. Meanwhile, the measurement results are not much different on topology point to multipoint with repeater topology. The point to multipoint topology is slightly better than the repeater of the three QoS parameters.
ABSTRAKPenerapan teknologi Long Term Evolution (LTE) di Indonesia belum optimal dalam pengalokasian spektrum dikarenakan keterbatasan spektrum, untuk mengatasi masalah tersebut 3GPP mengeluarkan teknologi terbaru yaitu LTEAdvanced yang mendukung fitur carrier aggregation (CA) yang memberikan throughput yang lebih tinggi dengan penggunaan spektrum yang lebih efisien. Pada penelitian ini dilakukan perencanaan jaringan LTE-Advanced menggunakan metode inter-band CA dengan menggabungkan dua band frequency yang berbeda yaitu bandwith 5 MHz di band 5 (850 MHz) dan bandwidth 10 MHz di band 3 (1800 MHz). Untuk mendapatkan performansi yang maksimal perencanaan jaringan LTE dan LTE-A dikombinasikan dengan penggunaan skema Physical Cell Identity (PCI) dan Soft Frequency Reuse (SFR). Penggunaan PCI meningkatkan SINR sebesar 1 dB dan throughput meningkat sebesar 200 Kbps, sedangkan penggunaan skema SFR meningkatkan SINR sebesar 9 dB dan throughput meningkat sebesar 13 Mbps.Kata kunci: LTE-Advanced, PCI, SFR, Carrier Aggregation. ABSTRACTThe implementation of Long Term Evolution (LTE) technology in Indonesia has not been optimal due to spectrum limitations. To overcome the problem, 3GPP issued the latest technology, i.e. LTE-Advanced, to support the carrier aggregation (CA) feature that provides higher throughput with more efficient spectrum usage. In this study, LTE-Advanced network planning was performed using the inter-band CA method by combining two different band frequencies, namely 5 MHz bandwidth on Band 5 (850 MHz) and 10 MHz bandwidth on Band 3 (1800 MHz). In addition, to generate maximum performance, the LTE and LTEA networks planning was combined with the use of Physical Cell Identity (PCI) and Soft Frequency Reuse (SFR) schemes. The use of the PCI managed to increase SINR by 1 dB and throughput by 200 Kbps, while the use of SFR scheme managed to increase SINR by 9 dB and throughput by 13 Mbps.Keywords: LTE-Advanced, PCI, SFR, Carrier Aggregation.
Post-print of SNTT2014.Perkembangan teknologi menciptakanbanyak inovasi, salah satunya adalah lampu rumah berbasis LED yang nantinya tidak hanya digunakan sebagai penerangan saja tetapi juga untuk media komunikasi. Cahaya LED digunakan untuk pemanfaatan Visible Light Communication sebagai pengiriman berbasis teks. Sistem komunikasi visible light communication dapat memungkinkan untuk mengirimkan data berbasis teks. Pada blok Transmiter terdiri atas pengirim informasi atau client 1 ,USB to TTL , software pengubah teks menjadi sinyal cahaya yaitu Hyper terminal Communication, serta sumber radiasi berupa LED. Pada blok bagian Receiver terdiri atas photodetector , softwarepengubah cahaya menjadi sinyal listrik berupa teks, USB to TTL dan penerima informasi atau Client 2.Hasil dari penelitian ini adalah dapatdikirimnya data berupa teks melalui komputer 1 ke komputer 2 menggunakan sistem VLC. Parameter uji keberhasilan adalah jarak pengiriman dapat mencapai 2 meter, serta dapat mengirim dan menerima semua karakter mulai dari huruf, angka,dan simbol dengan sudut maksimal pengiriman yang terbentuk yaitu dari 0, 5, 10, 15, hingga 20 derajat.
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