Windows NT Research Articles

P159Three‐dimensional ultrasound reconstruction and telemedicine. Image analysis

BackgroundIn the present study the 3D US images reconstruction is combined with the distant consultation through internet or through an ISDN line.MethodTrial consists of explorations done during 1999/2000 in our US unit at the Obstetrics and Gynaecology Department. The equipment is integrated by: a standard Aloka‐SSD 680 ultrasound device, a Dual Pentium II workstation with 256 Mb RAM memory and Windows NT operative system, a falcon framegrabber board, and the TeleInvivo 3D reconstruction and teleconsultation software by MEDCOM.Echograph images are acquired by the workstation through a falcon digitising board, and the TeleInVivo software generates a 3D volume. These volumes can be sent to a remote host via internet or via an ISDN line, allowing an on‐line teleconsultation and telediagnosis.ResultsDuring the trial we made 149 teleconsultations of different pathologies. 3d reconstruction was time consuming (20 min to 4 h) and of a limited diagnostic value, but of future relevance to reduce patient multiple explorations due image constraints such as sub optimal foetal position among others. The final volumes are sent wavelet lossless compressed through internet or an ISDN line, and for a normal size of 1.5 MB the time consuming is from 4 to 8 min to be transmitted.ConclusionThe use of internet or an ISDN line is a fast method for sending and consulting 3D ultrasound images, and it is possible due to the selected volume rendering techniques that provide an effective compression of the original data.

Defragmenting really speeds up Windows NT machines

When they want to improve the operation of a PC running the Windows NT operating system, most people think of adding RAM or upgrading to a more powerful processor. Research proves there is a simpler solution: every so often, reorder the disk contents so that every file is stored in one piece, butted up against the next file. Files these days are usually fragmented and the fragments scattered all over the disk. When they are not, the disk drive's read/write head has less distance to travel and the left-over free space, being all in one place, will accept a larger chunk of file data. This defragmentation can more than triple system responsiveness, according to a study by the independent software testing laboratory NSTL Inc., Conshohocken, Pa. Just by running software that organizes a disk's contents properly both individuals and corporations can enjoy faster system performance.

Introducing Windows 2000 Security: Features and Management

Although Windows 2000 has been out for several months now, many companies are employing a “wait and see” approach, while others have relegated the software to the confines of engineering. As a result, many systems administrators and operations support personnel may not have had an opportunity to explore the new operating system and obtain a solid understanding of its enhancements. This article explores two major areas of Windows 2000: the new security features and the new toolset for management of those features. It is assumed that the reader has a solid understanding of the tools and security features available in Windows NT 4.0.

The 1999 DARPA off-line intrusion detection evaluation

Eight sites participated in the second Defense Advanced Research Projects Agency (DARPA) off-line intrusion detection evaluation in 1999. A test bed generated live background traffic similar to that on a government site containing hundreds of users on thousands of hosts. More than 200 instances of 58 attack types were launched against victim UNIX and Windows NT hosts in three weeks of training data and two weeks of test data. False-alarm rates were low (less than 10 per day). The best detection was provided by network-based systems for old probe and old denial-of-service (DoS) attacks and by host-based systems for Solaris user-to-root (U2R) attacks. The best overall performance would have been provided by a combined system that used both host- and network-based intrusion detection. Detection accuracy was poor for previously unseen, new, stealthy and Windows NT attacks. Ten of the 58 attack types were completely missed by all systems. Systems missed attacks because signatures for old attacks did not generalize to new attacks, auditing was not available on all hosts, and protocols and TCP services were not analyzed at all or to the depth required. Promising capabilities were demonstrated by host-based systems, anomaly detection systems and a system that performs forensic analysis on file system data.

教員養成における Windows NT Server ネットワークシステムの指導のカリキュラム開発

教員養成における Windows NT Server ネットワークシステムの指導のカリキュラム開発

Upgrading a TEXTOR Data Acquisition system for remote participation using Java and Corba

The partners in the Trilateral Euregio Cluster (TEC) are implementing and developing Remote Participation technologies that are expected to support a joint research programme on the experimental facility TEXTOR-94. A common TEC architecture for our heterogeneous data acquisition and storage systems is seen to be one of the major issues. As a consequence, legacy systems will be affected and have to be upgraded for optimised wide area network communication, platform independent data access and display. The object oriented redesign of the system to be described follows theses guidelines. The architecture of the system under development uses Java as programming environment and CORBA as Client/Server communication standard. It is described in this paper, how an operational Data Acquisition CAMAC subsystem of TEXTOR-94 based on OpenVMS and Decnet communications could be redesigned into an open, object oriented architecture in a platform independent way. A suitable Web Browser is required on the client side without further installation of application software to run the server. CORBA static method invocations are used for the communication between the client and server. At the server side, there is only Java code on top of the existing commercial OpenVMS CAMAC device driver. A modular object oriented software design permitted to eliminate dependencies of the generic module levels from the underlying bus systems. Porting of the Java code to other platforms like Windows NT and Linux has proven to be successful.

Computer Controlled High-Throughput Integration System: FasTEM

Abstract Introduction For the nano-area analysis of materials, it is necessary to evaluate all data obtained by HRTEM, EDS, EELS, and/or Energy Filter. Up till now, each analytical/imaging instrument required its original computer control system. Thus, the total operational environment for the nano-area analysis was not convenient for us. Recent progress of computer technology provides the ability to build a high performance environment for seamless operation by Client/Server design. We have developed computer controlled high-throughput integration system based on PC, called FasTEM system, having seamless integration function and real-time remote control function of all instruments related to nano-area analysis. The FasTEM system is composed of Windows NT based Server PC System that is connected to the target TEM via RS232C for integrated operation, and Client PC SYSTEM connected to the Server PC via TCP/IP for remote operation (Fig.l). Seamless Integration Function All user interfaces of the analytical/imaging instruments, such as HRTEM, STEM BF/DF, EDS, PEELS and GIF can be seamlessly integrated into the Server PC.

Com Components on Heterogeneous Platforms for E-Com Applications

In the age of Component technologies gaining momentum, it's good idea to understand various features of these technologies or middle-ware systems. Of the different component architectures Component Object Model (COM) / Distributed COM (DCOM) is one of the leading architecture which is widely used for component design, development and distribution. The main strength of COM/DCOM is integration with the OS and language independence.The advantage that we gain with integration into OS is the performance. The services offered by these architectures are viewed as services offered by OS not as middle-ware services. COM components can be developed using any of the popular languages like C, C++, VB, COBOL, Smalltalk etc. The only requirement is that language must have to support Interface Definition Language (IDL) compiler to translate the data structure across languages. The other requirement is that language must support either references or pointers to pass addresses across.In this paper we discuss about the platform Independent feature of COM components which is in evolutionary stage and Software AG® has come out with the implementation of COM/DCOM on other platforms like Linux®, HP UNIX®, OS/390 et al. We examine this feature on two popular platforms namely Windows NT4.0 Workstation and Red Hat Linux6.0 on Intel® systems. The COM component developed using VB6 (client) running on Windows NT can call the methods of the COM component developed using C (server) running on Red Hat Linux6.0.

The Internet: an aid to student research or a source of frustration?

ABSTRACT The Internet is a powerful resource for research providing limitless access to information. This article considers an application in the undergraduate Bachelor of Education in Design and Technology course (B. Ed. [Hons] D&T ). This four year course prepares students for the teaching of Design and Technology in secondary schools, focusing on the development of skills in design and problem solving. A project based approach is used within the course to encourage individual research activity and promote a student centred learning experience. As well as books and video resources, the students have access to the Internet through a network of Windows NT workstations. The potential for exploration via the Internet has been readily exploited by students and this article reviews the use made of this facility by students and their impressions of its value Providing Internet access posed many technical and managerial challenges, some of which are considered in the article. The experience gained in its use has provided some interesting insights into other issues surrounding Internet access. Student response to the Internet as a tool, experience of searches and some of their concerns about their experience in accessing Internet along with the perceived benefits are discussed in the article

CoMed: a real-time collaborative medicine system

CoMed is a prototype of a real-time collaborative medicine system that allows medical specialists to share patient records and to communicate with each other on the Internet. CoMed consists of a multimedia medical database containing relevant information about laryngeal diseases and a real-time collaboration system including a teleconferencing system, a whiteboard and a chatting system. CoMed is web-based. We adopted the object database O 2 and CORBA technologies for the multimedia medical database. Therefore, our system can provide the flexibility, extensibility and location transparency of patient databases. We developed a SeeYou Active X control for the teleconferencing system and a Java applet for the whiteboard and chatting system. CoMed improves the efficiency of the overall system by separating the servers on a UNIX machine and a Windows NT machine. CoMed can be utilized for stand-alone research, for collaborative consultations among medical specialists and for a telemedicine in participation with the patients and medical specialists. Our system can be extended easily into other types of the collaborative systems, such as collaborative distance learning, collaborative science system, etc.

Reconstruction and navigation system for intraoperative brachytherapy using the flab technique for colorectal tumor bed irradiation

Purpose: To present the development of a new navigation and reconstruction system based on an electromagnetic free-hand tracker and on CT imaging for treatment planning of intraoperative high-dose-rate brachytherapy (IORT-HDRB) in the sacral region. Our aim is to improve accuracy and to enable individualized treatment planning and dose documentation to be performed for IORT-HDRB using a flab technique. Methods and Materials: The material consists of an electromagnetic 3D tracker system, a PC workstation with Microsoft Windows NT 4.0 operating system, and a recognition program for continuous speech. In addition, we designed an external reference system constructed of titanium and Perspex, which is positioned in the pelvis, and a special digitizer pen for reconstruction of the flab geometry. The flab design incorporates a series of silicon 10-mm-diameter spherical pellets. Measurements were made with a pelvic phantom in order to study the accuracy of the system. The reconstruction results are stored and can be exported via network or floppy to our different treatment planning systems. Results: Our results for the reconstruction of a flab with six catheters and a total of 100 spherical pellets give mean errors in the range (2.5 ± 0.6) mm to (3.5 ± 0.8) mm depending on the positions of the pelvic phantom and transmitter relative to the operation table. These errors are calculated by comparing the reconstruction results of our system with those using a CT-based reconstruction of the flab geometry. For the accuracy of the navigation system for the pelvic phantom, we obtained mean errors in the range (2.2 ± 0.7) mm to (3.1 ± 1.0) mm. Conclusions: The new system we have developed enables navigation and reconstruction within the surgical environment with a clinically acceptable level of accuracy. It offers the possibility of individualized treatment planning and effective documentation of the 3D dose distribution in IORT-HDRB using a flab technique.

The student edition of Minitab for Windows 95 and Windows NT: Release 12 [Book Review

The student edition of Minitab for Windows 95 and Windows NT: Release 12 [Book Review

A Comparative Study on the Production of Satellite Orthoimagery for Geological Remote Sensing

In many geological applications of Earth Obervation (EO) data over mountainous regions little attention is given to orthorectification, mainly because of the large spatial errors that can be tolerated (often many times the original pixel size). In most times a least‐squares polynomial fit serves the purpose of image georeferencing. In this paper two procedures for optical EO data orthorectification are presented which differ on the extraction of the Digital Elevation Model (DEM). The procedures run on a commercial software package (EASI PACE v6.2.2 for Windows NT). The high‐resolution DEM can be either supplied by automated stereomatching of SPOT PAN 1A imagery or by in‐house digitising of l :50,000 contour maps. A SPOT DEM has been produced for a mountainous region in central Evia (Greece) and its comparison with the reference DEM yielded satisfactory results. That ensures the fast production of accurate orthoimages for geological mapping.

A readout system for X-ray powder crystallography

A system for capturing and processing data, from radiation detectors, in the field of X-ray crystallography has been developed. The system includes a custom-made mixed analog-digital 16-channel VLSI circuit in 50 μm pitch. Each channel comprises a charge amplifier, a shaper, a comparator and a 21-bit counter. The circuit can be scaled in a daisy chain configuration. Data acquisition is performed with a custom made PCI card while the control software is developed with Visual C++ under the MS Windows NT environment. Performance of a fully operational system, in terms of electronic noise, statistical variations and data capture speed is presented. The noise level permits counting of X-rays down to 8 keV while the counting capability is in excess of 200 kHz. The system is intended for X-ray crystallography with silicon detectors.

GraphiCode announces GC-PowerStation, a CAM optimized for Windows NT and 95/98

GraphiCode announces GC-PowerStation, a CAM optimized for Windows NT and 95/98

Integrating synchronous and asynchronous collaboration with virtual network computing

With thin-client virtual network computing technology, the support for synchronous collaboration offered by traditional CSCW tools has been extended to asynchronous participation in a shared workspace. Using frame buffer rectangles to relay pixel values, the system considered acquires and stores the ongoing computer session and offers all participants a joint viewing of their shared workspace. The system also forwards input from the real-time conferees to the remote session and offers support for teleoperations from multiple distributed users. It also lets latecomers retrieve and play back parts of the session they have missed with VCR-like control (fast forward, rewind, play, and stop). Distributed users can access the remote session from heterogeneous platforms such as X Window or Windows NT, or with a Web browser such as Netscape.

Distributed Simulation of Freeway Traffic Flow Using Personal Computers

This article presents a personal computer (PC)-based distributed simulation methodology applicable to real-time estimation of time-variant parameters in freeway traffic flow. The method uses the interprocess communication procedures currently available under Windows NT and adopts 2 types of distributed computing architectures. The proposed method, based on macroscopic traffic models developed and tested in prior studies, first divides a given freeway into a set of subsections depending on the number of available processors or PCs. At every time step, each processor simulates its own subsection and exchanges the internal boundary data with another processor that simulates the adjacent subsection. The performance of the parallel algorithm was compared with that of a single-processor-based sequential simulation using 2 different types of hardware configurations: a network of 2 PCs and a dual-processor PC. Test results with the 2-PC network parallel system showed a speedup of 1.94 over the sequential simulation with a single PC for the 1-hour simulation of a 20-mile freeway section. The speedup for 1-hour simulation of an 80-mile section was increased to 1.96 with 2 processors, which is close to the ideal speedup. Performance tests with the dual-processor PC resulted in consistent, but not significantly faster, execution than those with the 2-PC network, indicating the feasibility of developing a practical on-line decision support system with a network of PCs for freeway operations.

Assemble 2.0: a structure generator

Assemble 2.0, a new structure generator with a user-friendly interface is presented. The pieces of structural information that can be input are reviewed and an example of the achievable results in a fully automatic mode of operation is given. The generated structures can be ranked automatically on the basis of their 1H and/or 13C NMR spectra. The program is available for Windows 95, Windows 98, and Windows NT.

Radiologist's clinical information review workstation interfaced with digital dictation system.

Efficient access to information systems integrated into the radiologist's interpretation workflow will result in a more informed radiologist, with an enhanced capability to render an accurate interpretation. We describe our implementation of radStation, a radiologist's clinical information review workstation that combines a digital dictation station with a clinical information display. radStation uses client software distributed to the radiologist's workstation and central server software, both running Windows NT (Microsoft, Redmond, WA). The client system has integrated digital dictation software. The bar-code microphone (Boomerang, Dictaphone Corp, Stratford, CT) also serves as a computer input device forwarding the procedure's accession number to the server software. This initiates multiple queries to available legacy databases, including the radiology information system (RIS), laboratory information system, clinic notes, hospital discharge, and operative report system. The three-tier architecture then returns the clinical results to the radStation client for display. At the conclusion of the dictation, the digital voice file is transferred to the dictation server and the client notifies the RIS to update the examination status. The system is efficient in its information retrieval, with queries displayed in about 1 second. The radStation client requires less than 5 minutes of radiologist training in its operation, given that its control interface integrates with the well-learned dictation process. The telephone-based dictation system, which this new system replaced, remains available as a back-up system in the event of an unexpected digital dictation system failure. This system is well accepted and valued by the radiologists. The system interface is quickly mastered. The system does not interrupt dictation workflow with the display of all information initiated with examination bar-coding. This system's features could become an accepted model as a standard tool for radiologists.

Puppeteer

No abstract available.