AASRI Procedia最新文献

The intracranial space (ICS) is incompletely separated by the cerebral falx and the cerebellar tentorium into three compartments. To simulate brain herniation, defined as part of the brain shifting from one compartment to another, we proposed a simplified model of the supratentorial space (STS) based on computed tomographic (CT) images obtained from 50 subjects.

After identifying skull regions, we manually outlined the STS regions on CT slices. Pertinent dimensions of the STS and its openings were measured. The average volumes of the ICS and the STS were 1326 and 1154 mL. The average length, width and height of the STS were 154.7, 136.1, and 90.3 mm. The average length and height of the subfalcine space (SFS) were 85.8 and 52.1 mm, while the average length and width of midbrain were 37.9 and 30.9 mm.

Based on these data, we constructed a half sphere STS model with a diameter of 160 mm and a volume of 1072 mL. A 40 mm circle representing the tentorial incisura is removed from the center of its equatorial plane. This model is then divided into two compartments by its intact mid-sagittal plane, which had another 80 mm semicircle removed to simulate the SFS.

This paper presents an improved operation of the Custom power park with a newly proposed control algorithm for series active filter. Custom power devices operated for multiple customers in an industrial area form a common platform called custom power park (CPP). CPP delivers high quality high reliable supply than from the utility at different grades. The enhanced operation of CPP is proposed with GTO based static transfer switch, shunt and series active filters.The shunt active filter provides the harmonic and reactive power support for the park while voltage sag/swell and voltage harmonic mitigation is done by means of series active filter with a newly proposed control algorithm. The entire model of CPP is developed and operation is verified using MATLAB/ Simulink model.

This study provides a method to mitigate the effect of packet loss and congestion for a real-time transport protocol (RTP) [1] for video streaming. The sequence number of the RTP [2] was used to detect packet loss such that retransmission [3] and flow control [4] [5] could be addressed. Retransmission ensures that an entire frame can be appropriately decoded. Users do not see the broken image, and do not waste bandwidth. Flow control addresses the rate of data transmission that is adjusted dependent on the available network bandwidth. Frames per second are reduced by low bandwidth, but an image can still be viewed appropriately, without a black screen or freeze-frame occurring.

In this study, the acoustic echo problem and cancellation method of Android-platform-based VoIP was analyzed and researched. The echo problem is consequential for Android phone-based VoIP applications. However, in the traditional 2G/3G circuit-switch (CS) mode, the acoustic echo is cancelled by the hardware chip, and the quality of communication is adequate. In the future 4G/LTE environment, all-IP packet communication will be achieved. The IMS/VoIP will become the main application for personal speech communication systems. Before the introduction of 4G with echo cancellation built into its chip, the Android-based VoIP on 3.5G/WiFi will continue to undergo the aforementioned acoustic echo problem. This paper presents an analysis of the acoustic echo on Android-based VoIP and proposes a simple echo cancellation method.

Optimized study to the ratio of primeval ball loading in 4.0 × 6.0m overflow ball Mill of Yingezhuang gold mine, the research results showed that it pertains to low hard and brittle ores, the accurate size ball should be used rather than big size ball due to mainly fines mineral are produced in the process of comminution. As the yield of intermediate granularity between 8 to 0.45 mm reach up to 50.34%,the intermediate particles should be strengthened in grinding, -400 mesh content is about 40% and -10um content accounts for a quarter of the grind products what showed that particles size are not satisfied and unfavorable to subsequent separation. The optimum scheme of primeval ball loading is that: φ70: φ60: φ50: φ40= 15: 15: 30: 40 for φ4.0 × 6.0m overflow ball mill, the separate sizes contents is 64.19% between 0.15∼0.019 mm which increasing by 19.14% compare with 44.78% and the mill -200mesh utilization coefficient increasing 12.6 percents compare with 0.14 about original program when φ4.0 × 6.0m overflow ball mill work itself alone, in addition, the mill -200mesh utilization coefficient increasing 11.71 percents compare with 0.1503 about original program when φ4.0 × 6.0m overflow ball mill and φ3.6 × 6.0m grate ball mill are working together.

The Worldwide Interoperability for Microwave Access, or WiMax, is a wireless communication technique based on IEEE 802.16 standards. Its advantage of sending high-data rates over long distances, while using a single base station to cover a large area, has made this technique a flexible and reliable solution for public wireless networks. In this paper, a current-bleeding Gilbert Cell down-converter mixer is proposed for WiMax direct-conversion receivers. With 5.1 dB of conversion gain, 1.5 dBm of IIP3, 36 dBm of IIP2 as well as 11.6 dB and 8.4 dB of single sideband and double sideband noise figure, respectively, the proposed 0.15 mm InGaAspHEMT mixer largely meets the WiMax standards as demonstrated though successful comparison with published designs.

The high voltage (HV) lateral double-diffused MOS (LDMOS) has a much lower on-resistance, a higher tolerance to breakdown voltage and a higher output power used for automotive ICs and high-frequency communication modules. However, its shortcomings are evident, including a high trigger voltage (V_t1), low holding voltage (V_h), low ESD discharge capability per unit length and multi-fingers unable to fully turn-on, which are serious impacted the ESD reliability capability. In this paper, the HV-nLDMOS device with adding field-oxide-devices (FODs) in the bulk area to make the trigger voltage effectively decreased, and in order to increase the ESD capability is investigated. Furthermore, the influence of bulk P⁺ area which was replaced by FODs in the bulk region on snapback parameters in a 0.25-μm 60-V high voltage process is evaluated. After that, the ESD capability has grate increased while the device with adding any FOD structures in the 0.25-μm 60-V high voltage process. The I_t2 value is > 7A and to be increased > 111.74% than that of a reference group. Noteworthy, this structure may make the trigger voltage (V_t1) too low to operate normally. Therefore, it should be careful considered that the problem of maximum FOD occupied ratio while using this methodology.

This article introduced an accurate to ascertain the size of fine grinding medium. Comparative grinding tests are done by using cast iron segment steel ball. Grinding test results showed that mill capacity and grinding efficiency of cast iron segment could be really superior to steel ball. Grinding and flotation indexes have gotten obvious improvement when applying optimized fine grinding medium for industrial experiment.

Standing balance tests represent the most common way to assess person's functional ability and they were realized by means of specialized and expensive platforms, especially in clinicians’ environments. Wii Balance Board (WBB) is video-game based device that measures center of pressure (CoP) oscillations and it showed promising performance compared with ‘gold standard’ force platforms. In this paper we propose an open integrated custom application to define balance outcomes using WBB. These outcomes were used to execute a validity analysis of WBB performance compared with baropodometer platform (BP). Ten subjects performed two standing balance tests with open and closed eyes respectively on WBB and BP in separate occasion. Validity analysis was carried out using r-Pearson correlation coefficient, ICC analysis, paired-sample t-Test and Bland-Altman plots. Results confirmed that the WBB, although has a fraction of cost of other platforms, represents a tool suitable for some clinician analysis