# THEORETICAL COMPUTER SCIENCE - Journal - Bridge of Knowledge

## THEORETICAL COMPUTER SCIENCE

0304-3975

1879-2294

### Disciplines (Field of Science):

• Information and communication technology (Engineering and Technology)
• Computer and information sciences (Natural sciences)

### Ministry points: Help

Ministry points - current year
Year Points List
Year 2024 100 Ministry Scored Journals List
Ministry points - previous years
Year Points List
2024 100 Ministry Scored Journals List
2023 100 Ministry Scored Journals List
2022 100 Ministry Scored Journals List 2019-2022
2021 100 Ministry Scored Journals List 2019-2022
2020 100 Ministry Scored Journals List 2019-2022
2019 100 Ministry Scored Journals List 2019-2022
2018 20 A
2017 20 A
2016 20 A
2015 20 A
2014 20 A
2013 20 A
2012 25 A
2011 25 A
2010 27 A

Hybrid

### Points CiteScore:

Points CiteScore - current year
Year Points
Year 2022 2.5
Points CiteScore - previous years
Year Points
2022 2.5
2021 2.1
2020 1.9
2019 2.3
2018 2.4
2017 2.1
2016 1.8
2015 2
2014 2.1
2013 2
2012 2.1
2011 2.1

### Papers published in journal

• results on page:
• year:
title:
citation:

total: 24

#### Catalog Journals

##### Year 2023
• ###### The complexity of bicriteria tree-depth
Publication

- Year 2023

The tree-depth problem can be seen as finding an elimination tree of minimum height for a given input graph G. We introduce a bicriteria generalization in which additionally the width of the elimination tree needs to be bounded by some input integer b. We are interested in the case when G is the line graph of a tree, proving that the problem is NP-hard and obtaining a polynomial-time additive 2b-approximation algorithm. This particular...

##### Year 2022
• ###### Weighted 2-sections and hypergraph reconstruction
Publication

- Year 2022

In the paper we introduce the notion of weighted 2-sections of hypergraphs with integer weights and study the following hypergraph reconstruction problems: (1) Given a weighted graph , is there a hypergraph H such that is its weighted 2-section? (2) Given a weighted 2-section , find a hypergraph H such that is its weighted 2-section. We show that (1) is NP-hard even if G is a complete graph or integer weights w does not exceed...

##### Year 2021
• ###### Gossiping by energy-constrained mobile agents in tree networks
Publication

- Year 2021

Every node of an edge-weighted tree network contains a data packet. At some nodes are placed mobile agents, each one possessing an amount of energy (not necessarily the same for all agents). While walking along the network, the agents spend the energy proportionally to the distance traveled and collect copies of the data packets present at the visited network nodes. An agent visiting a node deposits there copies of all currently...

##### Year 2019
• ###### 2-Coloring number revisited
Publication

- Year 2019

2-Coloring number is a parameter, which is often used in the literature to bound the game chromatic number and other related parameters. However, this parameter has not been precisely studied before. In this paper we aim to fill this gap. In particular we show that the approximation of the game chromatic number by the 2-coloring number can be very poor for many graphs. Additionally we prove that the 2-coloring number may grow...

• ###### Cops, a fast robber and defensive domination on interval graphs
Publication

- Year 2019

The game of Cops and ∞-fast Robber is played by two players, one controlling c cops, the other one robber. The players alternate in turns: all the cops move at once to distance at most one each, the robber moves along any cop-free path. Cops win by sharing a vertex with the robber, the robber by avoiding capture indefinitely. The game was proposed with bounded robber speed by Fomin et al. in “Pursuing a fast robber on a graph”,...

• ###### Finding small-width connected path decompositions in polynomial time
Publication

- Year 2019

A connected path decomposition of a simple graph $G$ is a path decomposition $(X_1,\ldots,X_l)$ such that the subgraph of $G$ induced by $X_1\cup\cdots\cup X_i$ is connected for each $i\in\{1,\ldots,l\}$. The connected pathwidth of $G$ is then the minimum width over all connected path decompositions of $G$. We prove that for each fixed $k$, the connected pathwidth of any input graph can be computed in polynomial-time. This answers...

##### Year 2016
• ###### Topology recognition and leader election in colored networks
Publication

- Year 2016

Topology recognition and leader election are fundamental tasks in distributed computing in networks. The first of them requires each node to find a labeled isomorphic copy of the network, while the result of the second one consists in a single node adopting the label 1 (leader), with all other nodes adopting the label 0 and learning a path to the leader. We consider both these problems in networks whose nodes are equipped with...

##### Year 2015
• ###### Distinguishing views in symmetric networks: A tight lower bound
Publication

- Year 2015

The view of a node in a port-labeled network is an infinite tree encoding all walks in the network originating from this node. We prove that for any integers n ≥ D ≥ 1, there exists a port-labeled network with at most n nodes and diameter at most D which contains a pair of nodes whose (infinite) views are different, but whose views truncated to depth Omega( D log(n/ D )) are identical.

• ###### Rendezvous of heterogeneous mobile agents in edge-weighted networks
Publication

- Year 2015

We introduce a variant of the deterministic rendezvous problem for a pair of heterogeneous agents operating in an undirected graph, which differ in the time they require to traverse particular edges of the graph. Each agent knows the complete topology of the graph and the initial positions of both agents. The agent also knows its own traversal times for all of the edges of the graph, but is unaware of the corresponding traversal...

• ###### The complexity of zero-visibility cops and robber
Publication

- Year 2015

We consider the zero-visibility cops &amp; robber game restricted to trees. We produce a characterisation of trees of copnumber k and We consider the computational complexity of the zero-visibility Cops and Robber game. We present a heavily modified version of an already-existing algorithm that computes the zero-visibility copnumber of a tree in linear time and we show that the corresponding decision problem is NP-complete on a nontrivial...

• ###### The searchlight problem for road networks
Publication

- Year 2015

We consider the problem of searching for a mobile intruder hiding in a road network given as the union of two or more lines, or two or more line segments, in the plane. Some of the intersections of the road network are occupied by stationary guards equipped with a number of searchlights, each of which can emit a single ray of light in any direction along the lines (or line segments) it is on. The goal is to detect the intruder,...

##### Year 2014
• ###### Brushing with additional cleaning restrictions
Publication

- Year 2014

In graph cleaning problems, brushes clean a graph by traversing it subject to certain rules. We consider the process where at each time step, a vertex that has at least as many brushes as incident, contaminated edges, sends brushes down these edges to clean them. Various problems arise, such as determining the minimum number of brushes (called the brush number) that are required to clean the entire graph. Here, we study a new variant...

##### Year 2013
• ###### On minimum cost edge searching
Publication

- Year 2013

We consider the problem of finding edge search strategies of minimum cost. The cost of a search strategy is the sum of searchers used in the clearing steps of the search. One of the natural questions is whether it is possible to find a search strategy that minimizes both the cost and the number of searchers used to clear a given graph G. We call such a strategy ideal. We prove, by an example, that ideal search strategies do not...

##### Year 2012
• ###### Approximate search strategies for weighted trees
Publication

- Year 2012

W pracy podajemy 3-przybliżony algorytm dla problemu spójnego przeszukiwania drzew ważonych.

• ###### Smaller representation of finite state automata
Publication

- Year 2012

This paper is a follow-up to Jan Daciuk's experiments on space-efficient finite state automata representation that can be used directly for traversals in main memory (Daciuk, 2000)[4]. We investigate several techniques for reducing memory footprint of minimal automata, mainly exploiting the fact that transition labels and transition pointer offset values are not evenly distributed and so are suitable for compression. We achieve...

##### Year 2011
• ###### Connected searching of weighted trees
Publication

- Year 2011

W pracy pokazano, że problem spójnego przeszukiwania drzew ważonych jest silnie NP-zupełny. Problem pozostaje trudnym dla drzew z jednym wierzchołkiem o stopniu większym niż 2. Ponadto, przedstawiony został wielomianowy optymalny algorytm dla klasy drzew z ograniczonym stopniem.

• ###### Consensus models: Computational complexity aspects in modern approaches to the list coloring problem
Publication

- Year 2011

Artykuł poświęcony jest nowym modelom konsensusowego kolorowania grafów. Artykuł zawiera omówienie trzech takich modeli, analizę ich złożoności obliczeniowej oraz wielomianowy algorytm dla częściowych k-drzew, dla tzw. modelu addytywnego.

• ###### Phutball is PSPACE-hard
Publication

- Year 2011

W pracy dowodzimy, że gra ''Phutball'' (Philosopher's Football) jest PSPACE-trudna.

• ###### Synchronous black hole search in directed graphs
Publication

- Year 2011

The paper considers a team of robots which has to explore a graph G, where some nodes can be harmful. Robots are initially located at the so-called home base node. The dangerous nodes are the so-called black hole nodes, and once a robot enters in one of them, it is destroyed. The goal is to find a strategy in order to explore G in such a way that minimum number of robots is wasted. The exploration ends if there is at least one...

##### Year 2010
• ###### Taking advantage of symmetries: Gathering of many asynchronous oblivious robots on a ring
Publication

- Year 2010

One of the recently considered models of robot-based computing makes use of identical, memoryless mobile units placed in nodes of an anonymous graph. The robots operate in Look-Compute-Move cycles; in one cycle, a robot takes a snapshot of the current configuration (Look), takes a decision whether to stay idle or to move to one of the nodes adjacent to its current position (Compute), and in the latter case makes an instantaneous...

##### Year 2009
• ###### Universal Augmentation Schemes for Network Navigability
Publication
• P. Fraigniaud
• C. Gavoille
• A. Kosowski
• E. Lebhar
• Z. Lotker

- Year 2009

Rozważano problem uzupełniania grafu (reprezentującego np. sieci społeczne) poprzez dodanie w każdym węźle jednego dodatkowego skierowanego połączenia (długodystansowego). Dokładniej, dla każdego węzła definiuje się listę prawdopodobieństw istnienia połączenia wychodzącego z danego węzła do wszystkich pozostałych węzłów; wartości tych prawdopodobieństw muszą sumować się do jedności. Routing zachłanny w takiej sieci polega na przekazywaniu...

##### Year 2008
• ###### The maximum edge-disjoint paths problem in complete graphs
Publication

- Year 2008

Rozważono problem ścieżek krawędziowo rozłącznych w grafach pełnych. Zaproponowano wielomianowe algorytmy: 3.75-przybliżony (off-line) oraz 6.47-przybliżony (on-line), poprawiając tym samym wyniki wcześniej znane z literatury [P. Carmi, T. Erlebach, Y. Okamoto, Greedy edge-disjoint paths in complete graphs, in: Proc. 29th Workshop on Graph Theoretic Concepts in Computer Science, in: LNCS, vol. 2880, 2003, pp. 143-155]. Ponadto...

##### Year 2004
• ###### Finite automata for compact representation of tuple dictionaries.
Publication

- Year 2004

Opisane zostaje uogólnienie struktury danych - słownika, zwane słownikiem n-tek. Słownik n-tek przedstawia odwzorowanie n-tek łańcuchów znaków na pewne wartości. Motywacją dla powstania tej struktury danych są praktyczne zastosowania w przetwarzaniu języka i mowy, w których obszerne słowniki n-tek używane są do przedstawiania modeli języka. Przedstawiona zostaje technika oszczędnej reprezentacji słowników n-tek. Ta technika...

##### Year 2003
• ###### Rank two bibartite bound entangled states do not exist.
Publication

- Year 2003

Wykazano, że nie istnieją stany rzędu dwa które zawierałyby splątanie. Pokazano związki między lokalnym a globalnym rzędem macierzy gęstości oraz ewentualną możliwością wydestylowania kwantowego splątania.

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