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This paper focuses on delay and jitter for voice traffic in an IP based infrastructure for CDMA cellular networks. During soft handoff, a key aspect of CDMA networks, a mobile station (MS) may maintain connections with multiple base... more
This paper focuses on delay and jitter for voice traffic in an IP based infrastructure for CDMA cellular networks. During soft handoff, a key aspect of CDMA networks, a mobile station (MS) may maintain connections with multiple base station transceivers (BTS). Each connection is called a soft handoff connection. The MS transmits copies of the voice frame to each BTS.
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Abstrucr-We introduce a new protocol to improve the capacity of com-munication links to carry real-time applications that generate a large num-ber of small packets. The key issue in the transport of such applications is the relatively... more
Abstrucr-We introduce a new protocol to improve the capacity of com-munication links to carry real-time applications that generate a large num-ber of small packets. The key issue in the transport of such applications is the relatively large protocol overhead for each packet. For ...
Research Interests: Parasitology, Packet Switching, PPP, UMTS, Cellular Networks, and 14 moreCellular Network, asynchronous Transfer Mode, CDMA, Real Time Application, Packet Loss, UDP, Hdlc, Transport Protocols, Code Division Multiple Access, Switches, Channel Capacity, Base station, Radio Access network, and Payloads
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Research Interests:
Spontaneous intramedullary apoptosis was measured in bone marrow (BM) biopsies of 175 patients with myelodysplastic syndromes (MDS) using in situ end-labeling (ISEL) of fragmented DNA. Two groups of high (n=71) versus low (n =43) levels... more
Spontaneous intramedullary apoptosis was measured in bone marrow (BM) biopsies of 175 patients with myelodysplastic syndromes (MDS) using in situ end-labeling (ISEL) of fragmented DNA. Two groups of high (n=71) versus low (n =43) levels of apoptosis were identified while 61 patients were ISEL-negative. Semiquantitative assessment of 3 cytokines, the number of macrophages and in vivo labeling indices (LI) were also determined from consecutive sections of the biopsy. Patients with high apoptosis levels tended to have a high LI (p=0.013), more macrophages in their BM biopsies (p=0.006) and higher tumor necrosis factor alpha (TNF-alpha) levels (not significant) compared to patients with no apoptosis. In addition, low risk MDS patients had significantly lower rates of apoptosis (p = 0.047) and lower levels of TNF-alpha (p = 0.055) compared to high-risk MDS patients. We conclude that the genesis of cytopenias in MDS is of multifactorial origin and that cytokine-associated apoptosis clearly identifies a distinct biological subgroup of patients who may benefit selectively by use of anti-cytokine therapies.
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Recently, a consistent push towards a more electrical approach for drive systems in the aerospace and automotive industries has fueled interest in condition monitoring and prediction of impending electronic system failures and remaining... more
Recently, a consistent push towards a more electrical approach for drive systems in the aerospace and automotive industries has fueled interest in condition monitoring and prediction of impending electronic system failures and remaining useful life (RUL) of critical components. The ...
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Objective: To find out current indications for major lower limb amputation at a tertiary care teaching hospital of Karachi - Pakistan. Study Design: Case series. Setting & Duration: Department of Orthopaedic Unit II, Civil Hospital,... more
Objective: To find out current indications for major lower limb amputation at a tertiary care teaching hospital of Karachi - Pakistan. Study Design: Case series. Setting & Duration: Department of Orthopaedic Unit II, Civil Hospital, Karachi March 2007 to August 2007. Methodology: Case sheets of all patients who had major lower limb amputation during six months period. Main outcome measures
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Modem, bandwidth efficient modulation schemes have come to rely on the use of power control to account for issues not only related to very restrictive adjacent channel power requirements, but also to achieve maximum battery lifetime by... more
Modem, bandwidth efficient modulation schemes have come to rely on the use of power control to account for issues not only related to very restrictive adjacent channel power requirements, but also to achieve maximum battery lifetime by maximizing the efficient ...
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Research Interests:
Loquat cv. Mardan is a promising variety in loquat growing areas of northern Punjab and Khyber Pakhtoon Khwa. Loquat growers face serious issue of true to type plants availability. An attempt was made to explore different vegetative... more
Loquat cv. Mardan is a promising variety in loquat growing areas of northern Punjab and Khyber Pakhtoon Khwa. Loquat growers face serious issue of true to type plants availability. An attempt was made to explore different vegetative propagation techniques to find out most successful method for nursery industry. In the study propagation through cutting (during spring) and grafting during different suitable seasons (spring and monsoon) was examined. Cuttings were treated with different growth regulators to promote rooting. PBZ, IBA and their combinations were applied to the cuttings. Highest success percentage (40%) was achieved with PBZ. This limited success in rooting of cuttings was complete failure in getting plant survival at the end of the study. In the second phase of the experiment different grafting techniques i.e. tongue, cleft and side grafting were evaluated during two different seasons i.e., spring and monsoon. Cleft grafting in the months of March/ April proved to be mos...
In loquat fruit, browning is a major problem that reduces the shelf life. Study was conducted to evaluate the potential of citric acid (CA) and ascorbic acid (AA) as anti-browning agents during storage of loquat fruit. Loquat fruit was... more
In loquat fruit, browning is a major problem that reduces the shelf life. Study was conducted to evaluate the potential of citric acid (CA) and ascorbic acid (AA) as anti-browning agents during storage of loquat fruit. Loquat fruit was immersed for 2 min in solutions of 250 mg/l, 500 mg/l, 750 mg/l ascorbic acid (AA) and citric acid (CA) then placed in corrugated soft board cartons and stored at 4°C for a period of 10 weeks. Changes in browning index (BI), superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), total phenolic content (TP), polyphenoloxidase (PPO) and free radical scavenging activity (FRSA) as affected by different treatments were studied. Ascorbic acid at higher concentrations was useful in maintaining the fruit quality than citric acid, while AA and CA at higher concentrations significantly reduced the browning.
In the present paper we investigate the aeroacoustic characteristics of the flow over a forward facing step. The purpose is to identify relevant regions which are responsible for the noise generation. Correlation measurements are carried... more
In the present paper we investigate the aeroacoustic characteristics of the flow over a forward facing step. The purpose is to identify relevant regions which are responsible for the noise generation. Correlation measurements are carried out for the pressure fluctuations on the wall, velocity characteristics of the flow and the recorded far-field acoustic pressures. The application of the correlation techniques
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ABSTRACT The exhaustive cycle-gated (ECG) scheme was proposed as a high throughput access mechanism for high speed bus protocols like Expressnet and Fasnet. However, the ECG scheme exhibits unfairness to downstream station which surer... more
ABSTRACT The exhaustive cycle-gated (ECG) scheme was proposed as a high throughput access mechanism for high speed bus protocols like Expressnet and Fasnet. However, the ECG scheme exhibits unfairness to downstream station which surer higher mean and variance of ...
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... Dynamic Leakage Current Monitoring Antonio Ginart1, Irfan N. Ali1, Jonathan Goldin1, Patrick W. Kalgren1, Michael J. Roemer1, 1Impact Technologies, Rochester, NY 14623, USA { Antonio.Ginart, Irfan.Ali, Jonathan.Goldin,... more
... Dynamic Leakage Current Monitoring Antonio Ginart1, Irfan N. Ali1, Jonathan Goldin1, Patrick W. Kalgren1, Michael J. Roemer1, 1Impact Technologies, Rochester, NY 14623, USA { Antonio.Ginart, Irfan.Ali, Jonathan.Goldin, Patrick.Kalgren, Mike.Roemer}@impact-tek.com ...
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ABSTRACT This paper presents a new sensing application to diagnose power semiconductor aging in power drive systems. It has been shown previously that device parasitic characteristics change during the aging process which results in... more
ABSTRACT This paper presents a new sensing application to diagnose power semiconductor aging in power drive systems. It has been shown previously that device parasitic characteristics change during the aging process which results in detectable changes in their frequency response. This change is manifested in the current signal at very high frequencies. Therefore, using a wideband AC current sensor, high frequency components of the current can be acquired, providing a way to detect device aging.
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The Exhaustive Cycle-Gated (ECG) Service Scheme is used in a single-server multiqueue system. It works as follows: at the beginning of each cycle, when the server reaches queue Q1, a poller is dispatched from Q1. This poller visits... more
The Exhaustive Cycle-Gated (ECG) Service Scheme is used in a single-server multiqueue system. It works as follows: at the beginning of each cycle, when the server reaches queue Q1, a poller is dispatched from Q1. This poller visits queues in a sequential order Qi, Q2, ...
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Flow induced noise from a Forward Facing Step (FFS) is numerically investigated and comparison done with experimental work. The Reynolds number based on the height of the step is Reh 8000. A Hybrid approach is used for the Computational... more
Flow induced noise from a Forward Facing Step (FFS) is numerically investigated and comparison done with experimental work. The Reynolds number based on the height of the step is Reh 8000. A Hybrid approach is used for the Computational Aeroacoustics (CAA). Turbulent ...
4 Computational Aeroacoustics based on Lighthill's Acoustic Analogy Manfred Kaltenbacher1, Max Escobar2, Stefan Becker3, and Irfan Ali4 1 FriedrichAlexanderUniversitat ErlangenNurnberg, Lehrstuhl fur Sensorik, PaulGordanStraße... more
4 Computational Aeroacoustics based on Lighthill's Acoustic Analogy Manfred Kaltenbacher1, Max Escobar2, Stefan Becker3, and Irfan Ali4 1 FriedrichAlexanderUniversitat ErlangenNurnberg, Lehrstuhl fur Sensorik, PaulGordanStraße 3/5, 91052 Erlangen, ...