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- Oleg Burdakov, Lujin Gong, Spartak Zikrin, Ya-Xiang Yuan
- Math. Program. Comput.
- 2017

Limited memory quasi-Newton methods and trust-region methods represent two efficient approaches used for solving unconstrained optimization problems. A straightforward combination of them deteriorates the efficiency of the former approach, especially in the case of large-scale problems. For this reason, the limited memory methods are usually combined with a… (More)

- Oleg Burdakov, Patrick Doherty, Kaj Holmberg, Jonas Kvarnström, Per-Magnus Olsson
- Robotics: Science and Systems
- 2009

When unmanned aerial vehicles (UAVs) are used to survey distant targets, it is important to transmit sensor information back to a base station. As this communication often requires high uninterrupted bandwidth, the surveying UAV often needs a free line-of-sight to the base station, which can be problematic in urban or mountainous areas. Communication ranges… (More)

We consider the problem of minimizing the distance from a given ndimensional vector to a set defined by constraints of the form xi ≤ xj . Such constraints induce a partial order of the components xi, which can be illustrated by an acyclic directed graph. This problem is also known as the isotonic regression (IR) problem. IR has important applications in… (More)

- Oleg Burdakov, Ivan Kapyrin, Yuri V. Vassilevski
- J. Comput. Physics
- 2012

We suggest here a least-change correction to available finite element (FE) solution. This postprocessing procedure is aimed at recovering the monotonicity and some other important properties that may not be exhibited by the FE solution. Although our approach is presented for FEs, it admits natural extension to other numerical schemes, such as finite… (More)

- Oleg Burdakov, Patrick Doherty, Kaj Holmberg, Per-Magnus Olsson
- J. Global Optimization
- 2010

We consider a constrained optimization problem with mixed integer and real variables. It models optimal placement of communications relay nodes in the presence of obstacles. This problem is widely encountered, for instance, in robotics, where it is required to survey some target located in one point and convey the gathered information back to a base station… (More)

We consider a constrained optimization problem with mixed integer and real variables. It models optimal placement of communications relay nodes in the presence of obstacles. This problem is widely encountered, for instance, in robotics, where it is required to survey some target located in one point and convey the gathered information back to a base station… (More)

- Oleg Burdakov, Patrick Doherty, Kaj Holmberg, Jonas Kvarnström, Per-Magnus Olsson
- I. J. Robotics Res.
- 2010

When unmanned aerial vehicles (UAVs) are used for surveillance, information must often be transmitted to a base station in real time. However, limited communication ranges and the common requirement of free line of sight may make direct transmissions from distant targets impossible. This problem can be solved using relay chains consisting of one or more… (More)

- Per-Magnus Olsson, Jonas Kvarnström, Patrick Doherty, Oleg Burdakov, Kaj Holmberg
- 2010 11th International Conference on Control…
- 2010

An important use of unmanned aerial vehicles is surveillance of distant targets, where sensor information must quickly be transmitted back to a base station. In many cases, high uninterrupted bandwidth requires line-of-sight between sender and transmitter to minimize quality degradation. Communication range is typically limited, especially when smaller UAVs… (More)

- Oleg Sysoev, Oleg Burdakov, Anders Grimvall
- Computational Statistics & Data Analysis
- 2011

Monotonic regression (MR) is an efficient tool used for estimating functions that are monotonic with respect to input variables. We have recently developed a fast high-accuracy approximate algorithm, called GPAV. It allows solving efficiently large-scale multivariate MR problems. We present here an approach which extends the area of its applications to much… (More)

- Oleg Sysoev, Oleg Burdakov
- 2016

Monotonic Regression (MR) is a standard method for extracting a monotone function from non-monotonic data, and it is used in many applications. However, a known drawback of this method is that its fitted response is a piecewise constant function, while practical response functions are often required to be continuous. The method proposed in this paper… (More)