he oil industry was among the first of the large industries both to adopt discounted cash flow methods in valuing assets and projects. Discounted cash flow (DCF) tools are fundamental to engineering and financial analysis in the oil industry. They are well understood by managers and generally provide accurate valuations of developed hydrocarbon reserves. Unfortunately, DCF techniques systematic...

Fiber-optic dispersion and its effect on optical transmission system are analyzed. The most commonly used dispersion compensation fiber (DCF) technology is studied in this article. Three schemes (pre-compensation, postcompensation, mix-compensation of dispersion compensation) of dispersion compensation with DCF are proposed. In this study, we propose three DCF compensation scheme, pre-compensat...

IEEE 802.11 DCF is an asynchronous and distributed MAC protocol which does not require the existence of a central controller for medium access coordination. This flexibility, which is due to DCF’s contention-based nature, comes at the expense of the overhead associated with contention resolution. The overhead consists of frame collision time and channel idle time, which is particularly severe w...

Two patients with hairy cell leukemia with massive splenomegaly and severe pancytopenia were treated with recombinant alpha-A interferon (IFN-alpha-2a). There was no significant response to a trial of IFN-alpha-2a (11 and 20 weeks) with respect to blood counts or spleen size. Subsequent treatment with 2'-deoxycoformycin (dCF) for 8 consecutive weeks (4 mg/m2/wk) resulted in normalization of spl...

Discriminative correlation filter (DCF) based trackers have recently achieved excellent performance with great computational efficiency. However, DCF based trackers suffer boundary effects, which result in the unstable performance in challenging situations exhibiting fast motion. In this paper, we propose a novel method to mitigate this side-effect in DCF based trackers. We change the search ar...

SUMMARY IEEE 802.11 is a standard for wireless LANs. The basic access method in its MAC layer protocol is the distributed coordination function (DCF) for the ad hoc networks. It is based on the mechanism of carrier sense multiple access with collision avoidance (CSMA/CA). DCF is used to support asyn-chronous data transmission. However, frames in DCF do not have priorities, making it unsuitable ...

This work consists of two parts. In the first part, the doses in the human lung per unit exposure to thoron progeny, the dose conversion factor (DCF), was calculated. Dependence of the DCF on various environmental and subject-related parameters was investigated. The model used in these calculations was based on ICRP 66 recommendations. In the second part, the human lungs were considered as the ...

Wireless Local Area Networks (WLAN)s are today common for access to Internet; well-known and used is IEEE 802.11 standardized technology. Some drawbacks of the standardized distributed medium access scheme, Distributed Coordination Function (DCF) has resulted in considerations made to extend the DCF from single-hop communications to multi-hop. Multihopping has the potential to reduce energy con...

In the 802.11 protocol, fundamental medium access mechanism is called Distributed Coordination Function (DCF). DCF, before making any transmission attempt, nodes count down a timer with value randomly selected from Contention Window (CW) size. If transmitted packet involved in collision, node increases CW size an attempt to reduce collision rate. Conversely, if successfully, reduces order incre...

En el presente trabajo se realizó un estudio voltamperométrico del proceso de redox diclofenaco (DCF) en medio acuoso a partir baño electrolítico composición 0.001 M DCF y 0.1 Na2SO4 pH= 7, sobre electrodo fibra carbono 7 mm diámetro. Los procesos oxidación relacionaron al su forma aniónica (DCF-A), mientras que los reducción par ion {DFC-A − Na+}0. Las tendencias lineales la corriente pico vs ...