Abdullah Eroglu

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The fundamental assumption of an economic order quantity (EOQ) model is that 100% of items in an ordered lot are perfect. This assumption is not always pertinent for production processes because of process deterioration or other factors. This paper develops an EOQ model for that each ordered lot contains some defective items and shortages backordered. It is(More)
—Fresnel coefficients for three-layered uniaxially anisotropic media with arbitrarily oriented optic axes have been obtained using half-space reflection and transmission coefficients. The optic axes of the anisotropic media are assumed to be tilted at different angles ((ψ i , χ i), i = 1, 2). This gives arbitrary orientation for anisotropic medium in the(More)
Design, simulation, and implementation of microstrip spiral inductors for RF applications at the high frequency (HF) range are given. The simplified lumped element equivalent model parameters for spiral inductor are used to obtain the initial physical dimensions for the design. The spiral inductor is then simulated with planar electromagnetic simulator,(More)
Design, simulation, and implementation of multilayer microstrip type directional couplers for RFID systems operating in the ultra high frequency (UHF) range is presented. The two-line multi-layer microstrip directional coupler is integrated to the front end of an RFID system to provide the required isolation between transmitter and receiver, preventing(More)
Design of a sensor network system for maintaining safety in an industrial setting using energy harvesting interfaced with multiple antennas is given. The practical implementation, low interference, and high accuracy make this type of system ideal for industrial safety and automation applications. The sensor network system that operates at 5.8 GHz can be(More)