Adaptive TXOP Allocation Based on Channel Conditions and Traffic Requirements in IEEE 802.11e Networks

Arora, A.,Sung-Guk Yoon,Young-June Choi,Saewoong Bahk IEEE 2010 IEEE Transactions on Vehicular Technology VT Vol.59 No.3

<P>IEEE 802.11e has established a new access mechanism called the hybrid coordination function (HCF) as a step toward provisioning quality-of service (QoS) support. In this mechanism, a simple HCF scheduler is introduced to take the QoS requirements of admitted flows into account and allocate transmission opportunities (TXOPs), which is the time under which a station (STA) can send its burst of data packets, to STAs. Although many approaches have been taken to address the mechanism's inherent problems, unsubstantial effort has been afforded in tackling a channel-aware allocation mechanism. An STA can be in either the good or bad channel state in any feasible data rate, which can be modeled as a Markov chain of two states for each data rate. In view of this, we propose a mechanism of adaptive TXOP allocation that is applicable to existing scheduling algorithms. Our method works in accordance with channel and traffic conditions and complies with the link adaptation mechanism. Extensive simulation results verify that our method shows improved performance while ensuring long-term fairness among STAs and being adaptive to the channel conditions and underlying physical transmission rates.</P>

Association of Diabetes Mellitus with Hepatocellular Carcinoma in Patients of Chronic Liver Disease of Non-viral Etiology: A Case-control Study from North India

( Ravi Daswani ),( Anil Arora ),( Ashish Kumar ),( Praveen Sharma ),( Shrihari A ),( Pankaj Puri ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1

Aims: Hepatitis B, hepatitis C, alcohol, and non-alcoholic steatohepatitis are important etiological factors for hepatocellular carcinoma (HCC). Role of diabetes mellitus (DM) as a contributory factor for HCC in patients with viral etiology has been adequately demonstrated, however its role in HCC due to alcohol and NASH remains controversial. This case-control study aimed to investigate the association of DM with HCC in patients with alcoholic liver disease and cryptogenic (including NASH-related) liver disease. Methods: We conducted this case-control study at Sir Ganga Ram Hospital, Delhi, India. Consecutive patients of HCC due to alcohol or cryptogenic etiologies presenting between 2011 and 2017 were included in the study as cases. Age and sex matched patients of chronic liver disease of same etiologies, presenting during the same period, were chosen as controls. Cases and controls were in the ratio of 1:2. Patients of any other etiologies were excluded. Prevalence of DM among cases and controls were compared. Results: A total of 138 patients of HCC (mean age 61±9 years, 95% males) were included in the study. The etiologies of HCC were cryptogenic (including NASH) 54%, and alcohol 46%. DM was present in 48% of patients. A total of 276 controls (mean age 61±7 years, 92% males; P=NS compared to cases) were included in the study. Among patients of HCC due to cryptogenic / NASH etiology, the prevalence of DM was significantly higher than in controls (P=0.012; OR 2.3, 95% CI 1.2, 4.3). Among patients of HCC due to alcohol etiology the prevalence of DM was similar to that of controls (P=NS). Conclusions: DM is strongly associated with the increased risk of HCC in patients of cryptogenic / NASH etiology. Therefore, these patients represent a high HCC risk population and should be considered for closer HCC surveillance program. DM does not seem to increase the risk of HCC in patients of chronic liver disease due to alcohol etiology.

A HYBRID INTEGRAL EQUATION FINITE VOLUME SCHEME FOR TRANSONIC POTENTIAL FLOW PAST ARBITRARY CONFIGURATIONS

A. K. Bhattacharya,N. L. Arora 대한기계학회 1992 International Conference on Fluid Machinery Vol.1 No.1

A Study on Effect of Carrying FecB Gene on Body Weight in Garole and Garole×Malpura Sheep

Kolte, A.P.,Mishra, A.K.,Kumar, S.,Arora, A.L.,Singh, V.K. Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.10

High prolificacy in Garole sheep is due to existence of FecB mutation in an autosomal gene, bone morphogenetic protein receptor. The mutation enhances ovulation rate and in turn litter size in Garole sheep. Garole sires were crossed with non-prolific Malpura ewes with the aim to introduce prolificacy into Garole${\times}$Malpura (G${\times}$M) crosses through FecB introgression programme. In the present study, the effect of carrying booroola allele on litter size and live body weight was analyzed. The average litter size at birth was found to be 1.87 and 1.48 in the Garole and the G${\times}$M crosses, respectively. At weaning, 6-month, 9-month and 12-month of age, body weights were not affected by the presence of booroola allele (p>0.05); however, a significant effect (p<0.05) was found on body weight at birth in G${\times}$M crosses. In Garole sheep, no significant effect of FecB was observed on live weights in any age group. The interaction between the genetic group and the FecB genotype was also found to be non-significant.

Breeding Prolific Garole with Malpura Sheep for In creased Reproductive Efficiency in Semi Arid Tropics of India

Sharma, R.C.,Arora, A.L.,Mishra, A.K.,Kumar, S.,Singh, V.K. Asian Australasian Association of Animal Productio 2004 Animal Bioscience Vol.17 No.6

Garole, a prolific small sized sheep breed of West Bengal, was introduced in the Mutton project of the Institute in 1997 to explore the possibility of incorporating fecundity gene(s) into monotocus Malpura sheep of Rajasthan. Results of reproduction and production traits in respect of Garole${\times}$Malpura (G${\times}$M) half-breds have been obtained. Of 35 lambing obtained so far from the ewes of Garole${\times}$Malpura, 45.71% were twin lambing, whereas, Malpura sheep produced mostly single lamb except 2.55% twin lambing on an average. Other reproduction traits in G${\times}$M ewes such as lambing rate, litter size at birth and weaning were considerably improved over Malpura ewes. Results revealed that the fecundity genes responsible for increasing ovulation rate and litter size have been incorporated in to the G${\times}$M genotype and it might prove a valuable germ plasm towards evolving a new prolific strain of sheep. Interestingly, survivability of G${\times}$M half-breds was almost at par with the local Malpura sheep in harsh climatic conditions of semi-arid tropics. The body weights at different ages of G${\times}$M half-breds were on little lower side compared to contemporary Malpura lambs. Average kilogram of lambs weaned/ewe lambed in Malpura and G${\times}$M genetic group was 11.86 and 11.07 kg respectively. In view of minimizing the differences in body weights and kg of lambs weaned/ewe lambed between the two genetic groups, G${\times}$M ewes has to be backcrossed with Malpura rams to raise the inheritance of latter up to 75% level. However, further research is needed to reach on certain conclusions regarding net returns from such crosses.

Validity of the vertical tube-shift method in determining the relationship between the mandibular third molar roots and the inferior alveolar nerve canal

Anjana Arora,Bharati A. Patil,Amandeep Sodhi 대한구강악안면외과학회 2015 대한구강악안면외과학회지 Vol.41 No.2

Objectives: To assess the validity of the vertical tube-shift method using intraoral periapical radiography (IOPAR) for determining the relationship between the mandibular third molar roots and the inferior alveolar nerve (IAN) canal in comparison with cone-beam computed tomography (CBCT). Materials and Methods: Fifty impacted mandibular third molars were analyzed using the IOPAR vertical tube-shift method and CBCT. The relationship of the IAN canal to the impacted mandibular third molar was recorded as buccal, lingual or in line with the apex and was compared with CBCT findings. The sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of the vertical tube-shift method in depicting the relationship (buccal/lingual/in line with the apex) of the IAN canal to the third molar root apex was calculated. Results: The sensitivity and specificity PPV and NPV of the IOPAR vertical tube-shift technique was found to be highest for a lingual relationship (100%) followed by buccal (94.4%, 92.3%, 97.1%, and 85.7%) and in line with the apex relationship (88.9%, 95.0%, 80.0%, and 97.4%) of the IAN canal with the third molar root apex, respectively. A statistically significant association was observed between the IOPAR vertical tube-shift method and the CBCT with a P-value <0.01. Conclusion: The vertical tube-shift method can be used as an effective diagnostic tool in assessing the relationship of the IAN canal to the third molar root apex with high sensitivity, specificity, PPV, and NPV.

Orbital IgG4 Disease: Imaging Findings on 68Ga-DOTANOC PET/CT

Saurabh Arora,Nishikant A. Damle,Rachna Meel,Sanjay Sharma,Seema Sen,Chandrasekar Bal,Kanak Lata,Sneha Prakash,Divya Yadav,Meivel Angamuthu 대한핵의학회 2019 핵의학 분자영상 Vol.53 No.6

Immunoglobulin G4 (IgG4)–related diseases are a spectrum of systemic inflammatory conditions of unknown etiology, which are characterized by infiltration of tissues by IgG4 plasma cells and sclerosing inflammation (Cheuk and Chan Adv Anat Pathol 17:303–32, 2010). Although this condition was initially described in relation to autoimmune pancreatitis, now it has been reported in almost every organ system of body (Zen and Nakanuma Am J Surg Pathol 34:1812–9, 2010, Masaki et al. Ann Rheuma Dis 68:1310–5, 2009). Orbital involvement by IgG4 disease can involve extraocular muscles (EOM), lacrimal glands, conjunctiva, eyelids, infraorbital nerve, orbital fat, and nasolacrimal system (McNab and McKelvie. Ophthal Plast Reconstr Surg 31:167–78, 2015, Katsura et al. Neuroradiology 54:873–82, 2012). The basis of using 68Ga-DOTANOC PET/CT in IgG4 orbital disease is the known expression of somatostatin receptors in chronic inflammatory cells (Cuccurullo et al. Indian J Radiol Imaging 27:509-16, 2017) and also avidity shown previously in other IgG4-related diseases (Cheng et al. Clin Nucl Med 43:773-6, 2018).

Electrochemically deposited bismuth telluride thin films

SantoshGolia,M.Arora,R.K.Sharma,A.C.Rastogi 한국물리학회 2003 Current Applied Physics Vol.3 No.2, 3

Thin films ofbismuth telluride grown by electrochemical deposition technique on conducting glass and Mo sheet substrates, werecharacterized for their structural, morphological, optical and compositional analysis. These studies revealed polycrystalline an-isotropic and layered structure ofthese lms with dierent compositional stoichiometry. In the present work electrochemical de-application since it has a narrow optical energy band gap of0.13 eV. In this deposition process dierent lm growth parameters wereoptimized to get good quality ofcompositionally uniform bismuth telluride thin lm. XRD analysis revealed a hexagonal symmetrywith largec-axis lattice constants (Bi2Te3, B i2þ XTe3. X).. 2002 Elsevier Science B.V. All rights reserved.

Effect of oxygen partial pressure and annealing on nanocrystalline p-type ZnO:Sb thin films

K. Samanta,A.K. Arora,S. Hussain,S. Chakravarty,R.S. Katiyar 한국물리학회 2012 Current Applied Physics Vol.12 No.5

We have investigated the effect of oxygen partial pressure and annealing on nanocrystalline p-type Sb-doped ZnO thin films, grown by pulsed laser deposition, with hole concentration of 6.5 ×1018/cm3and mobility of 53 cm2/V-s. Uses of higher working pressure or annealing are found to reduce carrier concentration. A strong correlation is observed between carrier concentration and the violet (3.02 eV)emission related to free Zn-vacancy; stronger the violet emission, smaller the carrier concentration. In contrast to earlier suggestion of using higher oxygen pressure for obtaining p-type conductivity, the present results show a deterioration of the quality of film. We have investigated the effect of oxygen partial pressure and annealing on nanocrystalline p-type Sb-doped ZnO thin films, grown by pulsed laser deposition, with hole concentration of 6.5 ×1018/cm3and mobility of 53 cm2/V-s. Uses of higher working pressure or annealing are found to reduce carrier concentration. A strong correlation is observed between carrier concentration and the violet (3.02 eV)emission related to free Zn-vacancy; stronger the violet emission, smaller the carrier concentration. In contrast to earlier suggestion of using higher oxygen pressure for obtaining p-type conductivity, the present results show a deterioration of the quality of film.

Radioprotective and Antioxidant Activity of Fractionated Extracts of Berries of Hippophae rhamnoides

Rakesh Kumar Sharma,Raman Chawla,Rajesh Arora,Shikha Singh,Ravinder Kumar Sagar,Raj Kumar,Ashok Sharma,Manju L. Gupta,Surender Singh,Jagdish Prasad,Haider A. Khan,Anand Swaroop,A.K. Sinha,A.K. Gupta,R 한국식품영양과학회 2007 Journal of medicinal food Vol.10 No.1

Plants are an abundant source of medicinal compounds, some of which are useful in combating free radical-1002 (flavonoid-poor fraction) of Hippophae rhamnoideswere screened on the basis of their reducing power in the aqueousphase. REC-1001 was selected for further study, since it exhibited 27.38 times higher antioxidant activity than REC-1002.REC-1001 also showed significant (P. .05) membrane protection potential at 50 .g/mL, which was attributed to its abilityto scavenge peroxyl radicals (64.82. 1.25% scavenging within 1,440 min). A significant (P. .05) difference of 67.02% infree radical scavenging activity at 1,000 ng/mL between REC-1001 and vitamin E demonstrated the extract fraction’s worthc-tion. Further, REC-1001 was found to be nontoxic up to 200 mg/kg of body weight. This research suggests that the REC-1001 fraction of H. rhamnoidesextract is a safe and effective antioxidant nutraceutical product.