763 research outputs found
Edge contraction and cop-win critical graphs
No full textThe problem is to determine the number of ‘cops’ needed to capture a ‘robber’ where the game is played with perfect information, the different sides moving alternately. The cops capture the robber when one of them occupies the same vertex as the robber at any time in the game. A copwin graph is one in which one cop can always capture the robber. A graph is cop-win edge-critical with respect to edge contraction (CECC) when the original graph is not cop-win, but the contraction of any edge results in a cop-win graph. In this paper, classes of CECC graphs are determined, and k-regular CECC are characterized for k ≤ 4
On the domination number and cop number of Erdős–Rényi random graphs
No full textWe consider the game cops and robbers, which is a pursuit-evasion game played on a graph G. The cops and the robber take turns moving across the vertices of G, where the goal for the cops is to eventually catch the robber. Specifically, we study the cop number of G, i.e. the minimum number of cops that is needed to catch the robber on G. We investigate the relation between the cop number of the Erdős-Rényi (ER) random graph G(n, p_n) and compare it to another graph parameter, the domination number. Our goal is to collect results from previous research and create an overview. Throughout this thesis, we provide some examples of graphs for which the cop number is equal to the domination number. Furthermore, we provide proofs for some results on the domination number of the ER random graph. The main takeaway is that the cop number is asymptotic to the domination number for particular values of p_n.Applied Mathematic
Taking stock after the Warsaw COP. CEPS Commentary, 4 December 2013
No full textDrawing on his direct participation in the latest round of climate talks in Warsaw, Andrei Marcu looks at the results of the 19th COP through the lens of three basic questions, with a view to understanding how much progress was made and where we stand two years ahead of Paris.
Are the targets adequate and how do we reach environmentally adequate targets?
Can one understand and compare what other Parties are promising to do to ensure that the level of effort is comparable and equitable, and that companies are not asked to do more than their competitors in other jurisdictions? Is there comparability and equity in the eyes of the beholder?
Do we understand what tools each country uses (what is available, what one gets as support) to ensure that no one country (and its companies) gets an easier ride or competitive advantage in meeting the commitment/promises that countries make.
The author asserts that these questions need to be answered if an agreement is to be reached in 2015. And if they are not, he warns of mistrust, fear of carbon leakage and the temptation to resort to protectionist measures to compensate for competitive disadvantage
Ubiquitylation of epsilon-COP by PIRH2 and regulation of the secretion of PSA
No full textUbiquitylation appears to be involved in the membrane trafficking system including endocytosis, exocytosis, and ER-to-Golgi transport. We found that PIRH2, which was identified as an interacting protein for androgen receptor or p53, interacts with and ubiquitylates the ε-subunit of coatmer complex, ε-COP. PIRH2 promotes the ubiquitylation of ε-COP in vitro and in vivo and consequently promotes the degradation of ε-COP. The interaction between PIRH2 and ε-COP is affected by the presence of androgen, and PIRH2 in the presence of androgen promotes ubiquitylation of ε-COP in vivo. Furthermore, overexpression of the wild type of PIRH2 in prostate cancer cells causes downregulation of the secretion of prostate-specific antigen (PSA), a secretory protein in prostate epithelial cells and one of diagnostic markers for prostate cancer. Our results indicate that PIRH2 functions as a regulator for COP I complex
RAKAN COP REWARD PROGRAM
No full textRakan COP Reward Program is the extension and enhancement to the current Rakan COP
Community Program to reward points to public individual who cares to report criminal cases to
police department using SMS via their mobile phones. Points rewarded/earned are based on the
seriousness of the case reported as well as the quality of the report made.
It is found that the current Rakan Cop system does not get high public participation and the
quality of report is much to be desired. Hence the primary objective of this project is to
encourage and thus inculcate better interaction between public and police personnel for better
combating crimes in Malaysia.
The secondary objective is to have a reward system that can help to support the National Key
Result Area (NKRA) under the crime category. This project also encompasses elements for
building sense of loyalty and community participation to inform the police on crime cases before
the crime is committed. Author also will define the boundaries of the system that will be
implemented in which the development is to be studied, analyzed, designed, implemented and
finally improved.
Methodology that will be used during the system development is prototype methodology.
Besides that the author also emphasize on the community responsibilities towards fighting the
crime in Malaysia.
The results and discussion will discuss on contribution of the system, next step need to be taken
and other aspect that needs to emphasize in the project. Future work will include on integration
between the author's enhanced Information Monitoring & Management System (IMMS) that
support the Rakan COP Reward Program with USSD gateway
Seasonal COP of a residential magnetocaloric heat pump based on MnFePSi
No full textThe performance of a magnetocaloric heat pump (MCHP) consisting of active magnetocaloric regenerators (AMR) of 12 layers of MnFePSi magnetocaloric materials (MCM) with a linear distribution of Curie temperatures was investigated using a 1D numerical model. The model predicted the heating power and coefficient of performance (COP) of the AMR for a fixed temperature span of 27 K, between 281 K and 308 K, and variable flow rate and AMR cycle frequency. A maximum applied magnetic field strength of 1.4 T was used. A well-insulated house with a maximum heating power demand of 3 kW (under quasi steady state conditions) was considered. Ambient temperature in The Netherlands was taken as a reference for the estimation of the seasonal heating power demand. Without optimizing the design of the AMR, the model predicts a maximum single-AMR heating power equal to 43.5 W when the AMR operates at 3 Hz and 3 L min-1, and a maximum COP equal to 5.8 when it operates at 1.5 Hz and 1 L min-1 Considering the maximum heating power of a single AMR, approximately 69 AMRs are needed to provide the design heating power demand of the house. It was found that it is possible to achieve an AMR seasonal COP of 5.6 by continuously adjusting the flow rate and frequency of operation of the MCHP along with the ON/OFF switching of some groups of AMRs in order to adjust the heating power of the MCHP to the heating power demand of the house.RST/Fundamental Aspects of Materials and EnergyEngineering ThermodynamicsRST/Radiation, Science and Technolog
Cop Culture and Its Transmission Within Police Organisations
No full textAim: To study the way in which cop culture is transmitted, by examining the phenomena and cases that have been identified in the main areas of police culture: professional characteristics, values, canteen culture, code of silence.
Methodology: The author uses qualitative research, document and content analysis.
Findings: Research in the main areas of cop culture shows that deviant behaviour is rarely achieved by immediate action, by showing 'example'. One possible mode of transmission is mainly through verbalisation, which may be a kind of testing phase, followed by deviant behaviour. The detection of such cases is made more difficult by the characteristics of the police profession – (uncritical) loyalty, need for trust, conformity or empathy – thus helping to maintain and reproduce an inappropriate cop culture.
Value: Describes the role of morale in cop culture and police profession
Increasing the COP of a refrigeration cycle in natural gas liquefaction process using refrigerant blends of Propane-NH3, Propane-SO2 and Propane-CO2
No full textThis paper investigates the feasibility of using inexpensive techniques to enhance the coefficient of performance (COP) of the refrigeration cycle used in the liquefaction of natural gas. The effect of mixing the propane refrigerant with ammonia, sulfur dioxide and carbon dioxide on the performance and the work of the compressor is studied. It is shown that the mixture of ammonia-propane and sulfur dioxide-propane enhances the overall COP by 7% and 9%, respectively. The addition of ammonia and sulfur dioxide to the propane refrigerant reduces the overall compressor work by reducing the overall mass flowrate required to absorb a constant heat from the natural gas. On the other hand, the mixture of carbon dioxide-propane degrades the overall COP by 70%. The addition of carbon dioxide increases the overall mass flowrate required to absorb a constant heat from the natural gas. Interestingly, the proposed method requires small capital and running costs
Increasing the COP of a refrigeration cycle in natural gas liquefaction process using refrigerant blends of Propane-NH3, Propane-SO2 and Propane-CO2
No full textThis paper investigates the feasibility of using inexpensive techniques to enhance the coefficient of performance (COP) of the refrigeration cycle used in the liquefaction of natural gas. The effect of mixing the propane refrigerant with ammonia, sulfur dioxide and carbon dioxide on the performance and the work of the compressor is studied. It is shown that the mixture of ammonia-propane and sulfur dioxide-propane enhances the overall COP by 7% and 9%, respectively. The addition of ammonia and sulfur dioxide to the propane refrigerant reduces the overall compressor work by reducing the overall mass flowrate required to absorb a constant heat from the natural gas. On the other hand, the mixture of carbon dioxide-propane degrades the overall COP by 70%. The addition of carbon dioxide increases the overall mass flowrate required to absorb a constant heat from the natural gas. Interestingly, the proposed method requires small capital and running costs
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