Browse Items (67 total)
- Collection: Vol. 18, No. 6 2020
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TELKOMNIKA Telecommunication, Computing, Electronics and Control
Raised cosine/NRZ line coding techniques for upgrading free space optical communication systems through various levels of fog
This study examines raised cosine/NRZ line coding techniques for upgrading free space optical (FSO) communication systems through various levels of fog. The max. Q factors are simulated and estimated for clear air, light fog, and moderate fog weather…
TELKOMNIKA Telecommunication, Computing, Electronics and Control
Recognizing emotional state of user based on learning method and conceptual memories
With the increased use of computers, electronic devices and human interaction with computer in the broad spectrum of human life, the role of controlling emotions and increasing positive emotional states becomes more prominent. If a user's negative…
TELKOMNIKA Telecommunication, Computing, Electronics and Control
Reconfigurable ultra wideband to narrowband antenna for cognitive radio applications using PIN diode
Frequency reconfigurable antennas are very attractive for many wireless applications. They offer many advantages such as simplicity and compactness. In this electronic paper, we propose a reconfigurable antenna operating in the S and C bands. The…
TELKOMNIKA Telecommunication, Computing, Electronics and Control
Space charge phenomena on low-density poly ethylene film breakdown under heavy water absorption
The effect of dry and heavy water absorption on the electrical breakdown of low-density poly ethylene film was investigated. The temperature rise of the sample was observed by thermograph until the electrical breakdown using direct current ramp…
TELKOMNIKA Telecommunication, Computing, Electronics and Control
Spectral opportunity selection based on the hybrid algorithm AHP-ELECTRE
Due to an ever-growing demand for spectrum and the fast-paced development of wireless applications, technologies such as cognitive radio enable the efficient use of the spectrum. The objective of the present article is to design an algorithm capable…
TELKOMNIKA Telecommunication, Computing, Electronics and Control
Strategies for use, treatment, management and final disposition of wastes in academic laboratories
Laboratory higher education institutions can generate a wide range of wastes, many of which have hazardous characteristics. The uncontrolled accumulation of such wastes also has a significant impact on the environment, safety and health of the…
TELKOMNIKA Telecommunication, Computing, Electronics and Control
Study of red-emitting LaAsO4:Eu3+ phosphor for color
rendering index improvement of WLEDs with dual-layer remote phosphor geometry
The remote phosphor structure is often disadvantageous in color quality but in terms of optics it is more convenient when compared to other phosphor structures such as conformal or in-cup ones. From this disadvantage, there are many studies to…
TELKOMNIKA Telecommunication, Computing, Electronics and Control
Systematic review on evaluating planning process in agile development methods
Agile development methods have been catering the need of faster delivery of the ever-demanding domain of software engineering. These methods are able to deliver value to users and businesses via fast, reliable, and repeatable process. Planning…
TELKOMNIKA Telecommunication, Computing, Electronics and Control
The application of green YF3:Er3+,Yb3+ and red MgSr3Si2O8:Eu2+,Mn2+ layers to remote phosphor LED
White light-emitting diodes (WLEDs) with quantum dots (QDs) and phosphor have pulled in huge consideration because of their incredible shading rendering capacity. In the bundling procedure, a QDs film and a phosphor silicone layer will in general be…
TELKOMNIKA Telecommunication, Computing, Electronics and Control
The application of green YPO4:Ce3+,Tb3+ and red LiLaO2:Eu3+ layers to remote phosphor LED
Remote phosphor structure is commonly limited in color quality, but has greater luminous flux when comparing to structures with in-cup or conformal coating. From this dilemma, various researches with advance modifications have been proposed to…