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Search Results: 1 - 10 of 223764 matches for " R. Ramanarayanan "
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Two (s, S) Inventories with Perishable Units
S. Murthy,R. Ramanarayanan
Journal of Modern Mathematics and Statistics , 2012,
Abstract: Two inventories A and B with maximum capacity S and with perishable items are considered. Inter occurrence times of demands and the lead time for order are random variables. Whenever the inventory level falls to s from S, order is made for S - s units to fill up inventories A or B or both as the case may be. Inventory level probabilities are presented for exponential distribution. Numerical examples are also presented.
Inventory System Exposed to Calamities with SCBZ Arrival Property
S. Murthy,R. Ramanarayanan
Journal of Modern Mathematics and Statistics , 2012,
Abstract: This study is devoted to the analysis of (s, S) inventory system where the demand process is assumed to a combination of single and bulk demand for entire inventory where the rates of demand have the SCBZ property. The lead times and intervals of time between successive demands are i.i.d random variables. We discuss the exponential case of 2 models. In model 1, unit demand rates are varying and in model 2, bulk demand rates are varying. Steady state probability vector of inventory levels is obtained using NEUTS matrix method by Nutes in 1980. Numerical examples are also presented.
A probabilistic analysis of three levels of manpower affecting business-continuous time Markov chain model
C. Mohan,R. Ramanarayanan
Applied Mathematical Sciences , 2013,
Abstract: conditions which are restricted to depend on manpower, money andbusiness under fluctuating conditions of availability of man power andbusiness with a special emphasis given to a new and prevailing idea offrequent changes taking place in manpower. We consider three phases ofmanpower viz manpower is fully available, moderately or insufficientlyavailable and manpower not at all available or scarcely available andthe transitions take place from full availability to nil availability andfrom nil availability to full availability in case of money and businessbut in the case of manpower it is assumed that the transitions can befrom nil availability to moderate availability and vice versa and frommoderate availability to full availability and vice versa. No transitionstake place between the lowest and the highest. The different stateshave been discussed under the assumption that changes from one stateto another in any three characteristic occur in exponential times withdifferent parameters .An expression for “Rate of Crisis under steadystate (C∞)” is arrived and steady state cost have also been worked byassuming different costs for the parameters under different conditions.
Analysis of manpower system with two groups and different shortage processes
S. Mythili,R. Ramanarayanan
Applied Mathematical Sciences , 2013,
Abstract: When the Manpower system of an organization is exposed to Cu-mulative Shortage Process due to attritions that cause manpower loss,breakdown occurs at threshold level. In this paper, we consider theManpower System with two groups A and B. Group A consists of man-power other than top management level executives. Group B consistsof top management level executives. The shortages of group A occurin accordance with Modied Erlang process and group B has shortageprocess with varying shortage rates. Recruitment is done to ll all theshortages of the two groups. We nd the expected time to recruit andrecruitment time. Numerical illustrations are presented.
Stochastic analysis of business with two levels and manpower with three levels
C. Mohan,R. Ramanarayanan
International Journal of Contemporary Mathematical Sciences , 2012,
Abstract:
Cumulative demand inventory system with one by one parallel supply times
K. Usha,N. Nithyapriya,R. Ramanarayanan
International Journal of Contemporary Mathematical Sciences , 2012,
Abstract:
Probabilistic analysis of storage systems with random sales time depending on production
K. Usha,N. Nithyapriya,R. Ramanarayanan
International Journal of Contemporary Mathematical Sciences , 2012,
Abstract:
Analysis of storage systems with random sale depending on number of productions and production time
K. Usha,S. Kalaiarasi,R. Ramanarayanan
International Journal of Contemporary Mathematical Sciences , 2012,
Abstract:
Manpower recruitment in project network with pentagonal loops
K. Usha,P. Leelathilagam,R. Ramanarayanan
International Journal of Contemporary Mathematical Sciences , 2012,
Abstract:
A Search for Structural Alternatives of RNA
Krishnamurthy, Ramanarayanan;
Journal of the Mexican Chemical Society , 2009,
Abstract: this account describes a search for potentially primordial informational oligomers; the work is the direct outcome of the research program that was initiated by the eschenmoser group -at eth zürich about 20 years ago and was continued at the scripps research institute since 1996- in order to understand the chemical basis on which nucleic acids were chosen by nature as the molecular foundation of its genetic apparatus. the investigation began with the study of the base-pairing properties of structural alternatives of nucleic acids -constructed from different sugars (hexo- & pento-pyranoses and tetrofuranose) retaining the canonical nucleobases and phosphates. the outcome from these studies led to the conclusion that watson-crick type base-pairing is not unique to rna/dna, and that it can be compatible with a wide variety of backbone edifice. this provided the motivation to map the landscape of potentially primordial informational oligomer systems that may contain backbones, recognition elements and linker groups structurally quite different from those known so far. the oligomer systems chosen for study are, conceptually, deemed to be (a) potentially primordial (based on the nature of the starting materials and reaction conditions considered to be prebiotically realistic) and (b) informational (based on their ability to adopt a repetitive conformation such that the information encoded by the recognition elements can be transmitted intermolecularly). though such studies suggest the possibility of finding informational systems that could lay claim as functional ancestors of rna -they are more likely to generate results that provide the opportunity to assess the structural and functional uniqueness of nature's choice. the experimental investigation described here deals with the base-pairing properties of oligomer systems derived from 2,4-disub-situted -triazines, -5-aminopyrimdines and -6-carboxy pyrimidines as recognition elements that are tagged to oligo-dipeptide back
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