Distributed closed-loop EO-STBC for a time-varying relay channel based on kalman tracking

This paper considers distributed closed-loop extended orthogonal space-time block coding (EO-STBC) for amplify-forward relaying over time-varying channels. In between periodically injected pilot symbols for training, the smooth variation of the fading channel coefficients is exploited by Kalman tracking. We show in this paper that the joint variation of both relay channels still motivates the use of a higher-order auto-regressive model for the a priori prediction step within a decision-feedback system, compared to a first-order standard Kalman model. Simulations results compare these two case and highlight the benefits of the proposed higher-order Kalman filter, which offer joint decoding and tracking

Incremental rate maximisation power loading with BER improvements

This paper aims to maximise the rate over a MIMO link using incremental power and bit allocation. Two different schemes, greedy power allocation (GPA) and greedy bit allocation (GBA), are addressed and compared with the standard uniform power allocation (UPA). The design is constrained by the target BER, the total power budget, and fixed discrete modulation orders. We demonstrate through simulations that GPA outperforms GBA in terms of throughput and power conservation,while GBA is advantageouswhen a lower BER is beneficial. Once the design constraints are satisfied, remaining power is utilised in two possible ways, leading to improved performance of GPA and UPA algorithms. This redistribution is analysed for fairness in BER performance across all active subchannels using a bisection method

An Application Of Statistical Quality Control On Process Improvement: Case Study In Stayrod Manufacturing

This project was conducted at Jati Beringin Sdn. Bhd (SME Industry). This company is one of the steel industries in Malaysia. This study identified the problems that face regarding quality control in the production. The primary data include gathering data from the production department while the secondary data are archival collections such as information from journals, reference books, internet resources, and articles. Statistical process controls such as control chart and process capability were applied to analysis the data collected. From the analysis, it showed that the first three processes i.e. cutting. forging and deburring were in control. In terms of process capability. these processes were capable to produce as specification required. This specification is based on the customer requirements. However, for pressing and threading processes, there are probability 0.25 out of 5 which roughly 5% for pressing product rejected and 0.5 out of 5 which roughly 10% of the threading product are rejected. If the quality control is used properly by the company and used as a feedback, it may contribute to company competitive advantages. Besides that, the company also can achieve the customer expectations and satisfaction by providing products with minimal defect, and good service

Study of cryogenic machining for single tip cutting tooll using new cooling system design

In steel machining, high cutting temperature result will reduce the cutting tool life and also reduce the product quality. Conventional cutting fluid used to controlling the high cutting temperature but it is ineffective. Unfortunately, it leads to environment pollution problem. Cryogenic cooling which is an environmental friendly coolant can help rids of conventional fluid pollution problem. Present works are design and fabricate cryogenic coolant system that suit with a conventional lathe machine. Three cylindrical AISI 1045 steel tested up with TNMG TT5100 which is a Chemical Vapor Deposition (CVD) coated tool insert. The result compared with dry machining, machining with soluble oil as coolant and machining with cryogenic coolant; use nitrogen gas as the coolant. Results indicate the benefit of cryogenic cooling in tool life and surface finish. This may be attributed by the reduction of cutting zone temperature. Further, from the result proves that soluble oil failed to improve cutting tool life and product surface finish

Linking consumer trust perception in constructing an e-commerce trust model

Trust issues is still considered as a main obstacle in the implementation of eCommerce Due to the increasing numbers of cyber crimes committed today, consumers are faced with doubt to engage in online shopping. As a safety precaution, consumers will take certain measures to protect their information by evaluating and assessing these websites trustworthiness before an actual purchase occurs. This paper describes a model that examines the elements related to online consumer behavior and to investigate this behavior towards building and increasing trust. The applicability of the model was tested in attempt to view consumers' acceptance towards the model and its component. The fmdings indicate the respondents are aware of the trust issue surrounding e-Commerce implementation as they accept and agreed with the model and its components

Requirements of knowledge sharing for group decision support system

Group decision support systems (GDSS) have evolved from applications designed primarily to support decision making for groups. Indeed, it is generally accepted that improvements of group support systems is a longstanding interest to organizational researchers, containing solid practical as well as scientific significance. Within this practice, there is increasing challenge to improve the exchange of knowledge among group members in order to enhance GDSS capability of knowledge sharing. Therefore, the paper investigates the current GDSS situation and analyzing the requirements of knowledge sharing (KS) to enhance GDSS. It is hoped that these findings will aid to provide GDSS systems with the solid capability of knowledge sharing

Comparative study for broadband direction of arrival estimation techniques

This paper reviews and compares three different linear algebraic signal subspace techniques for broadband direction of arrival estimation --- (i) the coherent signal subspace approach, (ii) eigenanalysis of the parameterised spatial correlation matrix, and (iii) a polynomial version of the multiple signal classification algorithm. Simulation results comparing the accuracy of these methods are presented

Conservation and management prospects of the Persian and Malayan leopards.

Persian leopard. Being the largest predator of wide distribution in the mountains of Iran, the Persian leopard (Panthera pardus saxicolor Pocock 1927) is acknowledged as the "King of the Mountains" by local settlers. After the extinction of the Persian lion (Panthera leo) and the Caspian tiger (Panthera tigris), the Persian leopard is the last member of genus Panthera which still remains in its natural habitats in Iran. About five decades ago, living in most rural communities of Iran was based on the traditional methods of cultivation and animal husbandry, while urban growth and development were witnessing a slow progress. As a result, in many of the natural habitats in Iran, flocks of wild sheep and wild goat could be observed to occur widely in the dale hills and high mountains, specifically in the long ranges of Zagros and Alborz Mountains. Likewise, signs of the leopard presence could be found frequently in these areas

Relative abundance and diversity of waterbirds in a Rhizophora mangrove forest in Iran.

This study determined the abundance and diversity of waterbirds at Gaz and Hara River Deltas (GHRD) mangroves, southern of Iran. Point count sampling method that included 35 points along three transects was employed in this study. A total of 16687 waterbird observations, belonging to 38 waders, 15 seabirds and only one waterfowl species were recorded at GHRD international wetland. The observations were categorized based on different season, where a total of 4813 (37 spp.), 9445 (48 spp.), 1759 (30 spp.) and 670 (15 spp.) observations were recorded in the fall, winter, spring and summer, respectively. The Eurasian Curlew (3689 observations, 22.11%), Great Cormorant (1309 observations, 7.84%) and Terek Sandpiper (1065 observations, 6.38%) dominated the area. The Scolopacidae (7500 observations, 44.95%) and Laridae (2631 observations, 15.77%) were the most abundant family and Dromatidae (6 observations, 0.04%), Podicepedidae (4 observations, 0.02%) and Recurvirostridae (2 observations, 0.01%) were among families with the lowest number. The mean number of observations of waders during fall, winter, spring and summer were 104.11±36.60, 222.32±67.74, 22.62±6.82, and 10.16±3.91respectively, while of seabirds were 56.53±25.05, 71±28.15, 54.24±21.15 and 17.29±9.52, respectively. The similarity between seasons of fall and winter were highest (72 %). Abundance of waterbirds was positively correlated with density of molluscs and mudskipper, R. mucronata height and stand basal area as well as percentage of clay in soil (R2= 0.99, p < 0.01). In addition, species of Oriental White-eye Warbler (Zosterops palpebrozus) is a new record for GHRD. The great importance of GHRD for migrant waders and seabirds, and also for landbirds, must be recognized and the protection of this site from threats must be thoroughly enhanced