115 research outputs found
Development of Heartbeat Detection Kit for Biometric Authentication System
No full textAbstractAutomated security is one of the major concerns in modern time where secure and reliable authentication is in great demand. However, traditional authentication methods such as password and smart card are now outdated because they can be lost, stolen and shared. In this project, biometric system based on heartbeat signals which is also known as Electrocardiographic (ECG) signals is proposed. Heartbeat is chosen as modality due to an individual's ECG signals cannot be faked. Compared to fingerprint it can be fooled with fake fingers, face can be extracted using user's photo and voice can be imitated conveniently. As ECG signals are reflection of the mechanical movement of the heart, these features contain unique physiological information which make them a promising authentication technology. In this study, we develop a portable ECG detection kit for data acquisition. The prototype has successfully tested as a wearable bracelet heartbeat detection for personal system log in. For the software part, wavelet transform algorithm is used as feature extraction technique while for the classification process Support Vector Machine (SVM) is employed. Consequently, the whole system is then integrated on Intel Embedded N2600 Processor with Altera Cyclone IV FPGA Board (DE2-150) as biometric system. Experiment results showed that 2.0069% of EER performance has been achieved, thus this shows that the developed prototype can be a promising modality for biometric system
Chromatic equivalence classes of complete tripartite graphs
No full textAbstractSome necessary conditions on a graph which has the same chromatic polynomial as the complete tripartite graph Km,n,r are developed. Using these, we obtain the chromatic equivalence classes for Km,n,n (where 1≤m≤n) and Km1,m2,m3 (where |mi−mj|≤3). In particular, it is shown that (i) Km,n,n (where 2≤m≤n) and (ii) Km1,m2,m3 (where |mi−mj|≤3, 2≤mi,i=1,2,3) are uniquely determined by their chromatic polynomials. The result (i), proved earlier by Liu et al. [R.Y. Liu, H.X. Zhao, C.Y. Ye, A complete solution to a conjecture on chromatic uniqueness of complete tripartite graphs, Discrete Math. 289 (2004) 175–179], answers a conjecture (raised in [G.L. Chia, B.H. Goh, K.M. Koh, The chromaticity of some families of complete tripartite graphs (In Honour of Prof. Roberto W. Frucht), Sci. Ser. A (1988) 27–37 (special issue)]) in the affirmative, while result (ii) extends a result of Zou [H.W. Zou, On the chromatic uniqueness of complete tripartite graphs Kn1,n2,n3 J. Systems Sci. Math. Sci. 20 (2000) 181–186]
KNOWLEDGE-BASED INTERNAL CONTROL EVALUATION AND QUALITATIVE MODELLING
No full textMaster'sMASTER OF SCIENC
Chromatic equivalence classes of some families of complete tripartite graphs
No full textWe obtain new necessary conditions on a graph which shares the same chromatic polynomial as that of the complete tripartite graph Km,n,r. Using these, we establish the chromatic equivalence classes for K1,n,n+1 (where n ≥ 2). This gives a partial solution to a question raised earlier by the authors. With the same technique, we further show that Kn−3,n,n+1 is chromatically unique if n ≥ 5. In the more general situation, we show that if 2 ≤ m ≤ n, then Km,n,n+1 is chromatically unique if n is sufficiently large
Exploring the use of telephone helpline pertaining to older adult suicide prevention: A Hong Kong experience
No full text© 2018 Elsevier B.V. Background: Older adults usually have a higher suicide rate than the general population. There are helpline services provided to older adults but limited studies have examined the suicidal risks among the users, and how those services could be used as a platform to engage older adults in suicide prevention. Methods: In regard to elderly suicide prevention, this study explored the potential usefulness and relevance of a telephone helpline service in Hong Kong, which had 106,583 users during 2012–2015. An estimation on the suicide rates of the users was made and compared with the general older adult population in Hong Kong. The users’ suicide risks and their associated factors were assessed by survival analyses and an estimation system on the users’ suicide mortality likelihood was also tested. Results: The suicide rates of both male and female users were more than two times higher than the general older adult population in Hong Kong. The users’ risks of suicides were greater at the early period of using the service; men, living alone, and having a history of mental illnesses were also associated with increased risks. Based on the identified factors, an estimation system was developed with a sensitivity of 0.73 and specificity of 0.54. Limitations: A secondary data analysis. Conclusions: By identifying a suicide risk profile and distinct telephone calling pattern among the users, early detection and a warning system should be implemented to allow timely intervention to reduce the number of older adult suicides in the community.link_to_subscribed_fulltex
Associations of relative income deprivation with perceived happiness and self-rated health among the Hong Kong Chinese population
No full textAlgebraic properties of generalized Fibonacci Sequence via matrix Methods
No full textOver the past centuries, the fascination over the Fibonacci sequences and their generalizations has been shown by mathematicians and the wider scientific community. While most of the known algebraic properties of these sequences were found based on the well-known Binet formula, new discoveries seemed to have been dwarfed by the nature of the complexity of its methodology. Recently, matrix method has become a popular tool among many researchers working on Fibonacci related sequences. In this study, we investigate the generalized Fibonacci sequence by employing two different matrix methods, namely, the method of diagonalization and the method of matrix collation, making use of several generating matrices. We obtained some new algebraic properties and the sum of the generalized fibonacci sequence with different indice
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