다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Aspect] is a simple and practical aspect-oriented extension to Java With just a few new constructs, AspectJ provides support for modular implementation of a range of crosscutting concerns. In AspectJ's dynamic join point model, join points are well-defined points in the execution of the program; pointcuts are collections of join points; advice are special method-like constructs that can be attached to pointcuts; and aspects are modular units of crosscutting implementation, comprising pointcuts, advice, and ordinary Java member declarations. AspectJ code is compiled into standard Java bytecode. Simple extensions to existing Java development environments make it possible to browse the crosscutting structure of aspects in the same kind of way as one browses the inheritance structure of classes. Several examples show that AspectJ is powerful, and that programs written using it are easy to understand.

An overview of AspectJ

Assessing the determinants of cloud computing adoption: An analysis of the manufacturing and services sectors

Communications of the ACM (CACM for short, not the best sounding acronym around) is the ACM’s flagship magazine. Started in 1957, CACM is handy for keeping up to date on current research being carried out across all topics of computer science and realworld applications. CACM has had an illustrious past with many influential pieces of work and debates started within its pages. These include Hoare’s presentation of the Quicksort algorithm; Rivest, Shamir and Adleman’s description of the first publickey cryptosystem RSA; and Dijkstra’s famous letter against the use of GOTO. In addition to the print edition, which is released monthly, there is a fantastic website (http://cacm.acm. org/) that showcases not only the most recent edition but all previous CACM articles as well, readable online as well as downloadable as a PDF. In addition, the website lets you browse for articles by subject, a handy feature if you want to focus on a particular topic. CACM is really essential reading. Pretty much guaranteed to contain content that is interesting to anyone, it keeps tabs on the latest in computer science. It is a valuable asset for us students, who tend to delve deep into a particular area of CS and forget everything that is happening around us. — Daniel Gooch U ndergraduate research is like a box of chocolates: You never know what kind of project you will get. That being said, there are still a few things you should know to get the most out of the experience.

Communications of the ACM

Secrets and Lies: Digital Security in a Networked World

The Semantic Web, also known as the Web of meaning, is considered the new generation of the Web. Its objective is to enable computers and people to work in cooperation. A requisite for this is encoding data in forms that make web contents (meaning, semantics) more understandable by algorithmic means. In this paper, we present the application of semantic Web concepts and technologies to the access control area. The Semantic Access Control Model (SAC) uses different layers of metadata to take advantage of the semantics of the different components relevant for the access decision. We have developed a practical application of this access control model based on a specific language, denominated Semantic Policy Language (SPL), for the description of access criteria. This work demonstrates how the semantic web concepts and its layers infrastructure may play an important role in many relevant fields, such as the case of access control and authorization fields.

/pdf/applying-the-semantic-web-layers-to-access-control-57oyh1e4d6.pdf

Applying the semantic Web layers to access control

Software piracy has been considered one of the biggest problems of this industry since computers became popular. Solutions for this problem based in tamperproof hardware tokens have been introduced in the literature. All these solutions depend on two premises: (a) the physical security of the tamperproof device and (b) the difficulty to analyze and modify the software in order to bypass the check of the presence of the token. The experience demonstrates that the first premise is reasonable (and inevitable). The second one, however, is not realistic because the analysis of the executable code is always possible. Moreover, the techniques used to obstruct the analysis are not helpful to discourage an attacker with usual resources. This paper presents a robust software protection scheme based in the use of smart cards and cryptographic techniques. The security of this new scheme is only dependent on the first premise because code analysis and modification are not useful to break this scheme.

/pdf/an-efficient-software-protection-scheme-2fapmjk7d9.pdf

An Efficient Software Protection Scheme

The development of systems based on embedded components is a challenging task because of their distributed, reactive and real-time nature. From a security point of view, embedded devices are basically systems owned by a certain entity, used frequently as part of systems owned by other entities and operated in a potentially hostile environment. The development of security-enhanced systems of embedded components is a difficult task due to different types of threats that may affect such systems, and because the security in systems of embedded devices is currently added as an additional feature when the development is advanced, or avoided as a superfluous characteristic. We present in this paper a methodology for the analysis and modeling of threats and attacks for systems of embedded components. The Intruder Model allows us to describe possible actions a potential intruder can accomplish, depending on his/her capabilities, resources, etc. Using this information, we can define a Threat Model that will specify the threats and attacks that affect different security properties in specific domains.

A Methodology for the Analysis and Modeling of Security Threats and Attacks for Systems of Embedded Components

Security is considered one of the crucial issues for the widespread adoption of cloud computing. Despite all research done in preventive security for cloud computing, the high complexity and the interdependence of many software layers and infrastructures mean that in practice there are always chances for something going wrong. For this reason, there is a need to complement preventive security measures with reactive measures. Among these, monitoring is the most relevant approach. In this paper, we introduce a new and robust architecture for dynamic security monitoring and enforcement specially designed for cloud computing scenarios. Our solution is therefore a complete one including a three-layered architecture, a new language for expressing monitoring rules and a strategy based on the generation of a finite-state machine to improve the performance of the monitoring engine.

A Performance-Oriented Monitoring System for Security Properties in Cloud Computing Applications

The Semantic Access Control Model (SAC), built on the basis of separation of the authorization and access control management responsibilities, provides adequate solutions to the problems of access control in distributed and dynamic systems with heterogeneous security requirements. SAC is characterized by its flexibility for accommodating dissimilar security policies, but also by the ease of management and control over a large number of distributed elements and the support for interoperability of authorization mechanisms. In this paper, we present the semantic validation algorithms developed in SAC to detect semantically incomplete or incorrect access control policies. Additionally, the formal model of SAC along with some proofs of its soundness is introduced. This formalization is the basis for additional model checking of the semantic validation algorithms developed.

/pdf/semantic-access-control-model-a-formal-specification-1clf3dui3c.pdf

Semantic access control model: a formal specification

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