Papers by Agha Mohsin Ali
Computational Accuracy and Infinitesimals In Data Envelopment Analysis
INFOR: Information Systems and Operational Research, 1993
The role of the non-Archimedean construct ∈ in the CCR and BCC models is clarified. It is establi... more The role of the non-Archimedean construct ∈ in the CCR and BCC models is clarified. It is established that the associated dual linear programs can be infeasible (for the multiplier side) and unboun...
The asymmetric m-traveling salesman problem: A duality based branch-and-bound algorithm
Discrete Applied Mathematics, Mar 1, 1986
Postcard from Kashmir and Other Poems
We study a lattice model of ``commons'', where a resource is shared locally among the agents of v... more We study a lattice model of ``commons'', where a resource is shared locally among the agents of various cooperative tendency. The payoff function of an agent is proportional to the fraction of his operation rate and the net output of the resource. After each time step a site is occupied by the neighbor of maximum profit or by its owner himself. In steady state the model is dominated by ``altruist'' agents with a small minority of selfish agents, forming a complex pattern. The dynamics selects cooperative levels in a way that the model becomes critical. We study the critical behavior of the model in case of moderate mutation rate and find the power spectrum of fluctuation of activity shows a $1/f^\alpha$ behavior with $\alpha \sim 1.30$. In case of very slow mutation rate the steady state has slow fluctuations which helps the evolution of higher cooperative tendency.
Ewing's sarcoma, a primitive neuroectodermal tumour is a rare entity belonging to a family of neo... more Ewing's sarcoma, a primitive neuroectodermal tumour is a rare entity belonging to a family of neoplasms of neuroectodermal origin. These highly aggressive neoplasms primarily affect older children and young adults. They primarily involve the bones or soft tissues. A quarter of Ewing's sarcomas occur principally in the soft tissues with primary involvement of the kidney being exceptionally rare. We hereby, present a case of 6 years old girl child with primary Ewing's sarcoma of the kidney who presented with abdominal mass and posed much diagnostic challenge. The patient underwent complete surgical excision of tumour, and is being treated with aggressive adjuvant chemotherapy.
Use of hidden network structure in the set partitioning problem
Lecture Notes in Computer Science, 1995
This paper demonstrates the use of hidden network structure for the solution of set partitioning ... more This paper demonstrates the use of hidden network structure for the solution of set partitioning problems. By finding a hidden network row submatrix, the set partitioning problem is transformed to a network with side constraints. Flow conditions on the revealed ...
Journal of the College of Physicians and Surgeons--Pakistan: JCPSP
Ellis-van Creveld syndrome is a rare form of mesenchymal - ectodermal dysplasia. It is an autosom... more Ellis-van Creveld syndrome is a rare form of mesenchymal - ectodermal dysplasia. It is an autosomal recessive disorder characterized by disproportionate short stature, postaxial polydactyly, ectodermal dysplasia and congenital heart defect. This case report presents two cases with classical clinical findings along with some unusual features including rhizomelic limb shortening, global developmental delay and bilateral lens subluxation not reported previously.
Comparison of three prognostic scores (PRISM, PELOD and PIM 2) at pediatric intensive care unit under Pakistani circumstances
Journal of Ayub Medical College, Abbottabad : JAMC
To compare the performance of the Pediatric Risk of Mortality (PRISM), the Pediatric Index of Mor... more To compare the performance of the Pediatric Risk of Mortality (PRISM), the Pediatric Index of Mortality 2 (PIM 2) and Pediatric Logistic Organ Dysfunction (PELOD) scores at general pediatric intensive care unit in a developing country setting, investigating the relation between observed and predicted mortality. A contemporary cohort study was undertaken at Pediatric Intensive Care Unit (PICU), Children's Hospital, Institute of Child Health, Lahore, Pakistan. 131 consecutive admissions fulfilling the inclusion criteria were enrolled in the study. PRISM, PIM 2 and PELOD calculations were performed as set out by original articles, using the published formulae. Statistical analysis included Standardized Mortality Rate (SMR), Hosmer Lemeshow goodness of fit test, receiver operating curve (ROC) characteristics and Spearman's correlation test. 139 patients were admitted to PICU. 38 presented exclusion criteria. 29 (28.7%) patients died. Estimated mortality was; PRISM: 19.7(19.5%), ...
Journal of the Autonomic Nervous System, 2000
McN-A-343, which is a ligand at muscarinic receptors on myenteric ganglia, was found to concentra... more McN-A-343, which is a ligand at muscarinic receptors on myenteric ganglia, was found to concentration-dependently (1-44 mM) elicit non-adrenergic relaxation of the longitudinal muscle of rat distal colon, having been precontracted with carbachol (1 mM). This effect was partly antagonized by the muscarinic receptor antagonist, pirenzepine (0.3 mM), the nerve blocker, tetrodotoxin (1 mM), or by drugs which interfere with purinergic neurotransmission (apamin [0.5 mM], reactive blue 2 [50 mM]). Blockade of nitric oxide synthase (L-NNA [100 mM]), or of the cAMP (H-89 [1 mM]), or cGMP (ODQ [10 mM]) second messenger pathways did not affect the relaxatory response to McN-A-343 (14 mM). An additional, non-neurogenic component of the relaxation to this compound on carbachol induced tone is suggested to reflect a partial antagonism of the muscarinic receptors on the gut muscle by McN-A-343.
The Wolf's Postscript to "Little Red Riding Hood
The Missouri Review, 1982
An Interview with Red Riding Hood, Now No Longer Little
The Missouri Review, 1982
There Is No God But
New England Review, 2014
Computational Aspects of DEA
Data Envelopment Analysis: Theory, Methodology, and Applications, 1994
The increased application of data envelopment analysis (DEA) over the past decade has been accomp... more The increased application of data envelopment analysis (DEA) over the past decade has been accompanied by a growing awareness of computational subtleties of the mathematical models that compose the methodology. In this chapter, we introduce elements of the computational characteristics of DEA in the context of the basic DEA models that were presented in chapter 2.
Assessment of intergovernmental revenue transfers
Socio-Economic Planning Sciences, 1993
Film Bhajan Found on a 78 rpm
Rethinking Marxism, 2000
Physics Letters B, 1980
We analyse the recent high energy e+e-data from PETRA in the context of QCD. Our analysis takes i... more We analyse the recent high energy e+e-data from PETRA in the context of QCD. Our analysis takes into account single and double gluon bremsstrahlung, the weak decays of the bottom and charm quarks, and the Q2.dependence of the fragmentation functions in the spirit of QCD. An attempt is made to extract the QCD coupling constant as(Q2). The recent high energy e+e-experiments at PETRA [1 ] have conformed the three-jet structure expected in the gluon bremsstrahlung picture of Quantum Chromodynamics, QCD [2]. In fact, theoretical predictions about jet broadening and the associated effects in the various jet distributions abound in the literature [2-4] and preceded the experimental confirmation. The present data e+e-data are in broad qualitative agreement with these predictions. The purpose of this note is to report an analysis that aims at a detailed quantitative comparison of QCD effects with the experimental measurements in e+e-annihilation. The motivation is that there are several confluent effects due to heavy quark thresholds in e+e-annihilation. A reliable quantitative estimate of pure QCD effects in e+e-annihilation cannot bypass this complication. An equally important effect is that the detector acceptance, selection criterion, efficiencies and the radiative corrections cannot be implemented if a detailed Monte-Carlo program is not available. A first attempt towards this goal was made in ref. [4] and a Monte-Carlo program based on this work already exists * 1. Our analysis differs from the pres
Physics Letters B, 1998
We compute the decay rates for the exclusive decays B ± → (η ′ , η)(K ± , K * ±) and B 0 → (η ′ ,... more We compute the decay rates for the exclusive decays B ± → (η ′ , η)(K ± , K * ±) and B 0 → (η ′ , η)(K 0 , K * 0) in a QCD-improved factorization framework by including the contribution from the process b → sgg → s(η ′ , η) through the QCD anomaly. This method provides an alternative estimate of the contribution b → scc → s(η, η ′) to these decays as compared to the one using the intrinsic charm content of the η ′ and η mesons determined through the decays J/ψ → (η, η ′ , η c)γ. The advantage of computing the relevant matrix elements via the QCD anomaly governing the transition gg → (η ′ , η) is that there is no sign ambiguity in these contributions relative to the matrix elements from the rest of the operators in the weak effective Hamiltonian. Numerically, the QCD anomaly method and the one using the radiative decays J/ψ → (η, η ′ , η c)γ give similar branching ratios for the decays of interest here. The resulting branching ratios are compared with the CLEO data on B ± → η ′ K ± and B 0 → η ′ K 0 and predictions are made for the rest.
Heavy quarks in e+e− annihilation
Nuclear Physics B, 1980
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Papers by Agha Mohsin Ali