For a caching system with multiple users, we aim to characterize the memory-rate tradeoff for uncoded cache placement, under nonuniform file popularity. Focusing on modified coded scheme (MCCS) recently proposed by Yu, etal., formulate placement optimization problem MCCS minimize average delivery rate popularity, restricting class of popularity-first placements. We then present two information-...

this study is a typological description of written formative feedback in an efl context in iran. twenty m.a. students of tefl participated in the study. they were required to summarize a scholarly article in each session on which the instructor would provide written corrective feedback (cf). written formative comments were extracted, coded, and categorized into various types, such as asking for...

This paper investigates a dual-tone MFSK signalling technique for a frequency-hopped spread-spectrum communication system. It allows for multiple access communications with less transmission bandwidth and thus greater number of users than conventional MFSK. Both uncoded and coded dual-tone MFSK systems are considered in multiple access interference and additive white Gaussian noise with and wit...