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Luo Family Converters (LFCs) are a new series of choppers, which converters fixed D.C voltage magnitude into variable D.C voltage magnitude for high voltage applications. The general requirements of any topology of DC-DC choppers are output voltage regulation, ripple voltage, size, efficiency, and cost. This paper presents a review LFCs based on S-T method for various High energy applications. The...
In this paper, we introduce the mixture communication method of single-flit and wormhole routing. In the method, a buffer memory is shared in each link and virtual channels are assigned. We also evaluated the dynamic communication performance with various amount of buffers. As a result, it was shown that the communication performance could be predicted from the packet length.
Flow completion times (FCTs) are critical for many cloud applications. To minimize the average FCT, recent transport designs, such as pFabric, PASE, and PIAS, approximate the Shortest Remaining Time First (SRTF) scheduling. A common, implicit assumption of these solutions is that the remaining time is only determined by the remaining flow size. However, this assumption does not hold in many real-world...
In wireless ad hoc networks, due to the interference between concurrent transmissions, the per node capacity generally decreases with the increasing number of nodes in the network. Caching can help improve the network capacity, as it shortens the content transmission distance and reduces the communication interference. However, current researches on the capacity of wireless ad hoc networks with caching...
Modern datacenters are increasingly required to deal with latency-sensitive applications. A major question here is how to represent latency in desired objectives. Incorporation of multiple traffic characteristics (e.g., packet values and required processing requirements) significantly increases the complexity of buffer management policies. In this work, we consider weighted throughput optimization...
RAM-based storage aggregates the RAM of servers in data center networks (DCN) to provide extremely high storage performance. For quick recovery of storage server failures, Mem-Cube [1] exploits the proximity of the BCube network to limit the recovery traffic to the recovery servers' 1-hop neighborhood. However, previous design is applicable only to BCube, and has suboptimal recovery performance due...
In data centers, micro-burst is a common traffic pattern. The packet dropping caused by it usually leads to serious performance degradations. Therefore, much attention has been paid to avoiding buffer overflow caused by micro-burst traffic. In particular, ECN is widely used in data centers to keep persistent queue occupancy low, so that enough buffer space can be available as headroom to absorb micro-burst...
Network providers now want to enable users to define their own flow priorities, and commercial devices already implement this ability. However, it has been shown that directly applying arbitrary user-defined priorities can fundamentally destabilize a network. In this paper, we show that it is possible to apply user-defined priorities while keeping the network stable. We introduce U-BP, a scalable...
MmWave communications, one of the cornerstones of future 5G mobile networks, are characterized at the same time by a potential multi-gigabit capacity and by a very dynamic channel, sensitive to blockage, wide fluctuations in the received signal quality, and possibly also sudden link disruption. While the performance of physical and MAC layer schemes that address these issues has been thoroughly investigated...
Machine-to-Machine (M2M) communication is considered one of the essential elements of the Internet of Things (IoT) for enabling objects to communicate over potentially large distances. It is predicted to be the dominant source of traffic in 5G networks. To enable M2M communications on LTE networks, which is considered the main cellular access technology for M2M communications, several issues need...
In this paper we propose a load balancing algorithm to increase the availability of network resources during peak local loads in wireless cellular networks. We simulate a network behavior in normal mode and with using the proposed method.
Tor hidden services make it possible to hide Internet services' location. Via so-called rendezvous circuits, Tor users can communicate with hidden services without learning each other's location. In this paper, we propose a performance-enhanced rendezvous circuit, which consists of five instead of six relays. We show that omitting the client's middle relay in a rendezvous circuit brings significant...
Active queue management (AQM) is broadly accepted as the tool of choice for tackling bufferbloat (the accumulation of large queueing delays) in network buffers. CoDel and PIE are considered two of the most promising AQM schemes, but little has been done to adopt them in cellular networks, which are particularly plagued by bufferbloat. This is partly due to the lack of adequate evaluation of their...
HTTP adaptive streaming (HAS) is the dominating type of video traffic in fixed and mobile networks. Although more and more mobile users stream videos over their cellular data connections, buffering is still a common problem due to fluctuating radio signal strength. We will demonstrate a new generation of context-aware HAS algorithms, which adapt video bit-rate based on location and radio information...
Video streaming takes the lion's share of network bandwidth, with a trend that will likely increase in the future. In the recent years, dynamic adaptive streaming has been developed to offer a smooth video stream with variable quality, depending on the performance of the network connection. At present, several content providers like Netflix, YouTube and Hulu, to name a few, already offer videos that...
In mobile networks, users may lose coverage when entering a building due to the high signal attenuation at windows and walls. Under such conditions, services with minimum bit-rate requirements, such as video streaming, often show poor Quality-of-Experience (QoE). We will approach this problem in two steps. First, we present a Bayesian detector that combines measurements from two Smartphone sensors...
Due to the expensive hardware and complex management of the traditional middlebox, a concerted effort towards the virtualized middlebox has been launched in both academia and industry. In this paper, we propose a unified middlebox model, MBBrick, which is composed of three operation modules (classifier, rewriter, forwarder) and a control module (the mcontroller). We then design a language, MG, to...
With the incredible rise in WiFi devices, proper assessment for performance is essential for Quality of Experience (QoE). In the past, many access point (AP) assessment metrics have been exploited to achieve optimal AP selection. However, these conventional metrics (e.g., throughput) are insufficient to capture the full dynamics of the AP load condition. In our paper, we posit that the recent introduction...
The vast amount of the machine type communication devices (MTCDs) in machine-to-machine (M2M) communications and their limited energy budget are the crucial challenges to transmission scheme design. This paper proposes an energy-efficient power control and time scheduling scheme in M2M communications with non-orthogonal multiple access (NOMA) and energy harvesting. User equipment (UEs) are configured...
To cope with increasing mobile data traffic, researchers are currently working on traffic offloading techniques for delivering data over unlicensed cellular bands. Current offloading schemes based on offloading data to Wi-Fi regardless Wi-Fi has sufficient throughput or not. Though, we propose a novel offloading technique based on the Remaining Throughput Scheme (RTS) for Wi-Fi selection. In our proposed...
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