The associative memory is a digital storage device in which all words can be simultaneously accessed and compared to a search argument. The associative processor is an extension of the associative ...memory which adds the capability for arithmetic operations within all words simultaneously. This paper will discuss the effects of the associative processor on each of the steps of discrete simulation. Specific topics discussed will include model construction, programming, running the simulation and data analysis.
Early diagnosis and surgical decision making are the key for survival in acute type A aortic dissection (AAD-A). As such, transesophageal echocardiography (TEE) is widely accepted tool in the ...diagnosis of AAD-A.
We used TEE in 49 cases as the sole diagnostic examination of AAD-A since November 1989. It was particularly useful intraoperatively to detect cerebral malperfusion during AAD-A repair. We were able to accurately monitor the blood flow of the aortic arch by using TEE for all patients throughout the operation. Only two patients developed severe cerebral malperfusion after the distal anastomosis was finished under deep hypothermic circulatory arrest. TEE showed that the malperfusion after the bypass was re-established. In both cases the expanded false lumen blocked the true lumen. We immediately switched the perfusion cannula from the femoral artery to the ascending aortic graft to create antegrade flow.
The subsequent TEE showed only the flow in the true lumen. One patient recovered without any complication while the other suffered mild, temporary neurological defects. Cerebral malperfusion is a potential catastrophic complication of AAD-A, which may exist before surgery or be caused by the operation itself.
We recommend continuous intraoperative TEE to monitor aortic arch flow during these operations. This allows immediate detection of cerebral malperfusion and prompt action can be taken to prevent irreversible brain damage.
Abstract Cardiovascular disease (CVD) is a costly, worldwide problem with significant annual morbidity and mortality. Guideline-based primary and secondary prevention is effective in preventing and ...controlling CVD. Such prevention must be implemented by an integrated team of physician-directed health professionals, during both the inpatient and the outpatient phases of care. Appropriate team members may include, but are not limited to, nurses, advanced practice nurses, physician assistants, dietitians, physical therapists, psychologists, pharmacists, cardiac fellows, exercise physiologists, and case managers. During the acute phase of care, various teams are activated as appropriate to specific needs of the patient in the medical (invasive and noninvasive) and surgical specialties. The outpatient phase varies with diagnosis and condition of the patient and team members are involved as needed. An integrated team effort is essential to the best care for each patient regarding individual management and will assure that evidence-based guidelines, in both treatment and secondary prevention, are implemented.
Large information systems that manage terabytes of data must provide rich functionality so that interesting new applications can be addressed. Since a wealth of data, information and knowledge are ...resident within these vast repositories, a variety of knowledge discovery techniques have developed. These techniques are very computationally intensive and require the movement of large amounts of data. In the search for new approaches, optics may be able to help since photons have the very attractive properties of high speed, non-interference, and parallelism. Optical systems can accommodate a large number of parallel, high-bandwidth channels and optical storage devices have very high storage densities. In this research the authors postulate an electro-optical computer architecture and examine the feasibility of executing a number of alphanumeric and image knowledge discovery algorithms on large multimedia data/knowledge bases with the purpose of increasing performance and functionality.
Recent advances in LSI, VLSI and memory technology have led to a reduction in hardware cost and an increase in mass storage capacity such that an associative array memory can be produced and ...supported. Toward this end, in this paper such an associative array computer called
REL
ational
A
ssociative
C
omputer
S
ystem (RELACS) is proposed.
An associative approach to data management is developed, and a methodology for measuring the performance and effectiveness of this approach is provided. Mathematical models which quantitatively ...describe retrieval, storage requirements, updating, and flexibility are developed for both a class of current sequential systems and an associative system. Utilizing these models, a comparison is made between the two systems under certain assumptions so that for given classes of data management problems, one can determine which system is more favorable.
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