This paper presents a new modeling of the intensities of typical rating change events with a multivariate affine jump process. The main feature of our model is that the intensity model has a mutually exciting structure in the sense that an event occurrence can jump not only the intensity of the same type of events but those of another event types. Also, such a modeling with the multivariate aff...

Opacity is a general behavioural security scheme flexible enough to account for several specific properties. Some secret set of behaviors of a system is opaque if a passive attacker can never tell whether the observed behavior is a secret one or not. Instead of considering the case of static observability where the set of observable events is fixed off-line or dynamic observability where the se...

In this study, a method is proposed based on multilinear principal component analysis (MPCA) for face recognition. This method utilized less features than traditional MPCA algorithm without downgrading the performance in recognition accuracy. The experiment results show that the proposed method is more suitable for large dataset, obtaining better computational efficiency. Moreover, when support...

I examine the corporate bond market reaction to bond rating changes using newly available corporate bond transaction data from the over-the-counter (OTC) market. I document significant price responses to both downgrades and upgrades in the in two-day period surrounding announcements. Since numerous studies find no evidence of a stock price reaction do upgrades, my findings adds to the literatur...

Emerging cloud markets like spot markets and batch computing services scale up services at the granularity of whole VMs. In this paper, we observe that GPU workloads underutilize GPU device memory, leading us to explore the benefits of reallocating heterogeneous GPUs within existing VMs. We outline approaches for upgrading and downgrading GPUs for OpenCL GPGPU workloads, and show how to minimiz...

15 We analyse the tracks of clock-shifted pigeons from six releases to determine how pigeons cope with the conflict between their sun compass and the other navigational cues. Time-lag embedding is used to calculate the short-term correlation dimension, a parameter that reflects the complexity of the navigational system and with it, the number of factors involved. In the beginning, while pigeons...

Truck crashes related to brake failure have been an increasing issue for traffic safety in Vietnam recently. Although previous studies pointed out several variables directly this type of crash, there has no research further examine influencing factors resulting from other actors representing inside a roadtransport system and the interactions among them. A systems-based approach, enabling analys...

In the current LIBOR transition to overnight–rate benchmarks, it is important understand theoretically and empirically what distinguishes actual term rates from overnight benchmarks or 'synthetic' based on such benchmarks. The well–known 'multi–curve' phenomenon of tenor basis spreads between structures associated with different payment frequencies provides key information this distinction. Thi...

In this article we address the issue of con dentiality of information in the context of downgrading systems i.e. systems admitting information ow between secrecy levels only through a downgrader. Inspired by the intuition underlying the usual de nition of admissible information ow, we propose an analogue based on trace equivalence as developed in the context of concurrency theory and on a modi ...