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Search for the memory duplicities in the Java applications using shallow and deep object comparison

Lipka Richard, Potuzak Tomas

Annals of Computer Science and Information Systems

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2019

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Vol. 18

781--789

EN

In high-level object languages, such as Java, a problem of unnecessary duplicates of instances can easily appear. Although there can be a valid reason for maintaining several clones of the same data in the memory, often it indicates that the application can be refactored into a more efficient one. Unnecessary instances consume memory, but in case of Java applications can also have a significant impact on the application performance, as they might prolong the time needed for the garbage collection. In this paper, we are presenting a method and a tool that allows detecting duplicity in the heap dump of a Java application, based on the shallow and deep object comparison. The tool allows to identify the problematic instances in the memory and thus helps programmers to create a better application. On several case studies, we also demonstrate that the duplicates appear not only in the student projects and similar programs that often suffer from poor maintenance but also in commonly available Java tools and frameworks.

2

Cryptographic keys management system based on DNA strands

Miśkiewicz Marek, Księżopolski Bogdan

Annals of Computer Science and Information Systems

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2019

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Vol. 18

231--235

EN

Security of cryptographic keys is one of the most important issue in a key management process. The question arises whether modern technology really allows for high level of physical protection and security of sensitive data and cryptographic keys. The article considers various contemporary types of threats associated with the storage of secret keys. We present an innovative way to store sensitive data, using DNA strands as a medium, which significantly reduces hazard connected with electronic devices based data storage and makes the key management process independent of third parties.

3

Space management at the local level in view of the conditions and planning theory on the example of medium-sized cities in the Łódź region

Krzysztofik S.

Architecture Civil Engineering Environment

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2016

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Vol. 9, no. 3

13--20

EN

The planned directions for development in space management within the commune are indicated by, among others, a study and a document drawn up mandatorily for the entire municipal area. The analysis of the study record for the Kutno and Opoczno show that municipalities determine areas for newly urbanized housing sites. The use of new buildings would involve a dramatic increase in local community. The number of the inhabitants is decreasing and these trends are likely to remain. The results of the calculations show that the study records, which should describe the conditions of its development are constructed without taking into account a constant reduction of the number of residents. A study of conditions and directions of spatial planning for Kutno and Opoczno were compared with the assumptions of the theory with the theory of crossing the barrier of urban development by Bolesław Malisz and creative vision of the city described by Charles Landry.

PL

Planowane kierunki w zarządzaniu przestrzenią wskazuje m.in., studium, dokument sporządzany obowiązkowo dla całej gminy. Analiza zapisów studium dla dwóch miast - Kutna i Opoczna pokazuje, że gminy ustalają powiększenie terenów zabudowy mieszkaniowej. Wykorzystanie nowych obszarów wymagałoby znacznego zwiększenia lokalnej społeczności. Liczba mieszkańców obu miast się zmniejsza, a prognozy przewidują utrzymanie trendu spadkowego. Wyniki obliczeń pokazują, że zapisy studium, które powinno wyznaczać kierunki rozwoju miasta są konstruowane bez uwzględnienia ciągłego zmniejszania się liczby mieszkańców. Ustalenia studium uwarunkowań i kierunków rozwoju Kutna i Opoczna zostały porównane z założeniami teorii rozwoju progowego miast Bolesława Malisza i wizją kreatywnego miasta opisanego przez Charles’a Landry.