1,446 research outputs found
A pascal compiler for PDP 11 minicomputers
In this paper the development of a cross-compiler running on the central computing facility is described. The compiler transforms PASCAL source code into object code for the PDP 11 family. The arguments for higher level languages on minicomputers and the choice made for PASCAL are discussed. It is shown that only a minor effort in terms of manpower is required if such a development is based on an existing compiler that is suited to the purpose of adaptation. Even without large amounts of optimization the code produced is both compact and efficient. Some attention is paid to requirements that should be fulfilled in portable compilers. The paper ends with a discussion of some strong points and weak points of the PDP 11 architecture
Accuracy of computerized tomography in determining hepatic tumor size in patients receiving liver transplantation or resection
Computerized tomography (CT) of liver is used in oncologic practice for staging tumors, evaluating response to treatment, and screening patients for hepatic resection. Because of the impact of CT liver scan on major treatment decisions, it is important to assess its accuracy. Patients undergoing liver transplantation or resection provide a unique opportunity to test the accuracy of hepatic-imaging techniques by comparison of finding of preoperative CT scan with those at gross pathologic examination of resected specimens. Forty-one patients who had partial hepatic resection (34 patients) or liver transplantation (eight patients) for malignant (30 patients) or benign (11 patients) tumors were evaluable. Eight (47%) of 17 patients with primary malignant liver tumors, four (31%) of 13 patients with metastatic liver tumors, and two (20%) of 10 patients with benign liver tumors had tumor nodules in resected specimens that were not apparent on preoperative CT studies. These nodules varied in size from 0.1 to 1.6 cm. While 11 of 14 of these nodules were 1.0 cm. These results suggest that conventional CT alone may be insufficient to accurately determine the presence or absence of liver metastases, extent of liver involvement, or response of hepatic metastases to treatment
A Behavior-Based Approach To Securing Email Systems
The Malicious Email Tracking (MET) system, reported in a prior publication, is a behavior-based security system for email services. The Email Mining Toolkit (EMT) presented in this paper is an offline email archive data mining analysis system that is designed to assist computing models of malicious email behavior for deployment in an online MET system. EMT includes a variety of behavior models for email attachments, user accounts and groups of accounts. Each model computed is used to detect anomalous and errant email behaviors. We report on the set of features implemented in the current version of EMT, and describe tests of the system and our plans for extensions to the set of models
Direct Measurements of the Transport of Nonequilibrium Electrons in Gold Films with Different Crystal Structures
The transport of femtosecond-laser-excited nonequilibrium electrons across polycrystalline and single-crystalline gold films has been investigated through time-of-flight measurements. The thicknesses of the films range from 25 to 400 nm. Ballistic electrons as well as electrons interacting with other electrons and/or with the lattice have been observed. The ballistic component dominates the transport in the thinner films, whereas the interactive transport mechanism is dominant at the upper end of the thickness range. A slower effective velocity of the interactive component is observed in the polycrystalline samples, and is assumed to arise from the presence of grain boundaries. The reflection coefficient of excited electrons at the grain boundaries is extracted from the experiment and is estimated to be r=0.12. The experiment also suggests that thermal equilibrium among the excited electrons is not fully established in the first 500 fs after excitation. © 1993 The American Physical Society
Leerplanverkenning actief burgerschap: handreiking voor schoolontwikkeling
SLO hoopt met deze publicaties aan scholen een handreiking te bieden voor het formuleren van
een eigen visie en het samenstellen een onderwijsprogramma dat tegemoet komt aan
kenmerken van actief en verantwoordelijk burgerschap. Wij realiseren ons dat weten waar je
voor staat als school en dat ook nog eens aantoonbaar waarmaken, niet alleen complex is maar
ook raakt aan schoolontwikkeling en schoolidentiteit. En aan betrokkenheid van ouders en de
omgeving. En dat vraagt om een effectieve maar hanteerbare samenwerking tussen praktijk,
beleid en onderzoek
AI-based association analysis for medical imaging using latent-space geometric confounder correction
AI has greatly enhanced medical image analysis, yet its use in
epidemiological population imaging studies remains limited due to visualization
challenges in non-linear models and lack of confounder control. Addressing
this, we introduce an AI method emphasizing semantic feature interpretation and
resilience against multiple confounders. Our approach's merits are tested in
three scenarios: extracting confounder-free features from a 2D synthetic
dataset; examining the association between prenatal alcohol exposure and
children's facial shapes using 3D mesh data; exploring the relationship between
global cognition and brain images with a 3D MRI dataset. Results confirm our
method effectively reduces confounder influences, establishing less confounded
associations. Additionally, it provides a unique visual representation,
highlighting specific image alterations due to identified correlations.Comment: 18 pages; 7 figure
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