Soohan Ahn

ORCID: 0000-0002-5945-0458
Publications
Citations
Views
---
Saved
---
About
Contact & Profiles
Research Areas
  • Advanced Queuing Theory Analysis
  • Probability and Risk Models
  • Simulation Techniques and Applications
  • Statistical Distribution Estimation and Applications
  • Markov Chains and Monte Carlo Methods
  • Insurance, Mortality, Demography, Risk Management
  • Stochastic processes and financial applications
  • Random Matrices and Applications
  • Advanced Wireless Network Optimization
  • Network Traffic and Congestion Control
  • Transportation Planning and Optimization
  • Stochastic processes and statistical mechanics
  • Wireless Communication Networks Research
  • Petri Nets in System Modeling
  • Bayesian Methods and Mixture Models
  • Scheduling and Optimization Algorithms
  • Advanced Optical Network Technologies
  • Healthcare Operations and Scheduling Optimization
  • Statistical Methods and Inference
  • Fuzzy Systems and Optimization
  • Customer churn and segmentation
  • Consumer Market Behavior and Pricing
  • Water Treatment and Disinfection
  • Insurance and Financial Risk Management
  • Caching and Content Delivery

University of Seoul
2012-2024

Seoul National University
2000-2013

AT&T (United States)
2002-2004

Abstract We establish in a direct manner that the steady state distribution of Markovian fluid flow models can be obtained from quasi birth and death queue. This is accomplished through construction processes on common probability space demonstration distributional coupling relation between them. The results here provide an interpretation for quasi-birth-and-death matrix-geometric approach Ramaswami subsequent based them by Soares Latouche. Keywords: Fluid flowsQueuesStochastic...

10.1081/stm-120023564 article EN Stochastic Models 2003-07-24

We derive several algorithms for the busy period distribution of canonical Markovian fluid flow model. One them is similar to Latouche-Ramaswami algorithm quasi-birth-death models and shown be quadratically convergent. These significantly increase efficiency matrix-geometric procedures developed earlier by authors transient steady-state analyses models.

10.1239/jap/1118777186 article EN Journal of Applied Probability 2005-06-01

Abstract Markovian fluid flow models are used extensively in performance analysis of communication networks. They also instances Markov reward that find applications several areas like storage theory, insurance risk and financial models, inventory control. This paper deals with the transient (time dependent) such models. Given a flow, we construct on same probability space sequence queues stochastically coupled to sense at certain selected random epochs, distribution level phase (the state...

10.1081/stm-120028392 article EN Stochastic Models 2004-02-27

An analysis of the time-dependent evolution canonical Markov modulated fluid flow model is presented using elementary level-crossing arguments.

10.1080/15326340500481788 article EN Stochastic Models 2006-05-01

Abstract A new class of probability distributions called "bilateral phase type (BPH)" on (−∞, ∞) is defined as a generalization the versatile (PH) [0, introduced by Marcel F. Neuts. We derive basic descriptors such in an algorithmically tractable manner and show that this has many interesting closure properties dense all real line. Based established versatility tractability distributions, we believe high potential for general use statistics, particularly to cover non-normal also its inherent...

10.1081/stm-200056029 article EN Stochastic Models 2005-01-01

SUMMARY We consider a Markov‐modulated fluid flow queueing model under D ‐policy. As soon as the level reaches zero, server becomes idle. During idle period, arrives from outside according to an underlying continuous time Markov chain (UMC) and does not process fluid. two increase patterns of during period: vertical (Type‐V) linear (Type‐L). The is reactivated only when cumulative in system exceeds predetermined threshold value . derive distributions mean performance measures for both types....

10.1002/nla.811 article EN Numerical Linear Algebra with Applications 2011-11-01

10.1016/j.jkss.2017.01.004 article EN Journal of the Korean Statistical Society 2017-02-07

A Markov-modulated Brownian motion (MMBM) is a substantial generalization of the classical Motion and obtained by allowing parameters to be modulated an underlying Markov chain environments. As with Motion, time-dependent analysis MMBM becomes easy once first passage times between levels are determined. However, in those distributions cannot explicitly, we need efficient algorithms compute them. In this article, provide powerful approach based on approximating sequence scaled fluid flows...

10.1080/15326349.2016.1211018 article EN Stochastic Models 2016-09-27

We derive several algorithms for the busy period distribution of canonical Markovian fluid flow model. One them is similar to Latouche-Ramaswami algorithm quasi-birth-death models and shown be quadratically convergent. These significantly increase efficiency matrix-geometric procedures developed earlier by authors transient steady-state analyses models.

10.1017/s0021900200000504 article EN Journal of Applied Probability 2005-06-01

10.1007/s00530-005-0166-7 article EN Multimedia Systems 2005-06-20

This article describes our study of the total shift during first passages (one-sided and two-sided exit times) Markov-modulated Brownian motion with bilateral ph-type jumps, which is referred to as MMBM. The defined value a so-called process at passage epochs process, introduced by Bean O'Reilly, behaves like continuous Markovian fluid process; that is, it increases or decreases linearly slopes regulated underlying Markov determines path Hence, notion shift, includes times MMBM special...

10.1080/15326349.2016.1165621 article EN Stochastic Models 2016-04-14

10.1016/j.jkss.2009.01.002 article EN Journal of the Korean Statistical Society 2009-03-01

We establish some interesting duality results for Markov-modulated fluid flow models. Though models are continuous-state analogues of quasi-birth-and-death processes, do differ by the inclusion a scaling factor.

10.1239/jap/1318940473 article EN Journal of Applied Probability 2011-08-01
Coming Soon ...