El propósito del presente estudio fue el de construir una escala breve bienestar psicológico en contexto universitario, fase preliminar. Para ello se contó con la participación 417 estudiantes facultad educación universidad pública Lima, ambos sexos, edades oscilantes entre los 17 y 35 años (M = 23, D.S. 1.86). Se trabajó tópicos Salud Mental (SM) Familia Relaciones Interpersonales (FR). método...

In order to address this issue, we propose a scheme which is referred to as mutual serializability assuming that the file system support transactions. Mutual serializability captures a consistent backup of an active file system by ensuring that the backup transaction is mutually serializable with every other transaction individually. This mutually serializable relationship is established consid...

A Role-Based Access Control (RBAC) model is used to make a system secure. In addition to keeping systems secure, objects have to be consistent in the presence of multiple transactions. Traditional locking protocols and timestamp ordering schedulers are based on ‘first-comer-winner’ and ‘timestamp order’ principles to make multiple conflicting transactions serialisable, respectively. In this pap...

Due to the unpredictability of mobile network, it is difficult to meet transaction deadlines in a mobile distributed real-time database system (MDRDTBS). We propose the idea of transaction shipping to reduce the overheads in processing a transaction over mobile network and in resolving priority inversion. We consider a distributed lock-based real-time protocol, the Distributed High Priority Two...

On-line resonance-ionization mass spectrometry has been applied to determine the isotope shift and hyperfine structure of 185189Au and 189Aum in the 6s 2S 1/ 2 6p 2Pl/2 (A =268 nm) transition. The Au atoms were obtained as daughters of mass-separated Hg isotopes produced at the ISOLDE facility at CERN ionized by a three-color, two-step resonant photoionization process, detected and n1ass select...

In the emerging web databases and e-commerce scenario, information systems have to meet intensive information requirements from a large number of users. These information systems receive both update transactions (UTs) and read-only transactions (ROTs). A UT contains both read and write operations and an ROT contains only read operations. Designing efficient protocols to process ROTs is a resear...

Locking-based concurrency control algorithms are often proposed as an alternative to optimistic algorithms for real-time database systems. Many of them suffer from the costs of transaction restarts, usually having influence on the system performance. We propose a new method called partial abort aimed to minimize the costs of restarts by saving the part of previously performed work, which is ind...

In the internet environment, computers-based information systems are being employed to maintain large amounts of information to meet different users’ information requirements. The users interact with the system by inserting/updating/querying the required information. The information systems process the user requests by executing the update transactions (UTs) for inserts/updates and readonly tra...

This work investigates the effect of the explicit inclusion of queueing delays due to locking overhead in a performance study of a two phase locking concurrency control method. A mean value analysis is used to calculate the system's performance measures, response time and throughput. It is found that the locking overhead's contribution to delay depends largely on the degree of page faulting act...