TY  - JOUR
A1  - Kleines, H.
A1  - Ziemons, Karl
A1  - Zwoll, K.
T1  - Experiences with ATM in a multivendor pilot system at Forschungszentrum Jülich
JF  - IEEE Transactions on Nuclear Science
N2  - The ATM technology for high speed serial transmission provides a new quality of communication by introducing novel features in a LAN environment, especially support of real time communication, of both LAN and WAN communication and of multimedia streams. In order to evaluate ATM for future DAQ systems and remote control systems as well as for a high speed picture archiving and communications system for medical images, Forschungszentrum Julich has build up a pilot system for the evaluation of ATM and standard low cost multimedia systems. It is a heterogeneous multivendor system containing a variety of switches and desktop solutions, employing different protocol options of ATM. The tests conducted in the pilot system revealed major difficulties regarding stability, interoperability and performance. The paper presents motivations, layout and results of the pilot system. Discussion of results concentrates on performance issues relevant for realistic applications, e.g., connection to a RAID system via NFS over ATM
Y1  - 1998
SN  - 0018-9499
VL  - 45
IS  - 4
SP  - 1867
EP  - 1871
ER  - 
TY  - JOUR
A1  - Weckesser, Martin
A1  - Grießmeier, Martin
A1  - Schmidt, Daniela
A1  - Sonnenberg, Frank
A1  - Ziemons, Karl
A1  - Kemna, Lars
A1  - Holschbach, Marcus
A1  - Langen, Karl-J.
A1  - Müller-Gärtner, Hans-W.
T1  - Iodine-123 α-methyl tyrosine single-photon emission tomography of cerebral gliomas: standardised evaluation of tumour uptake and extent
JF  - European Journal of Nuclear Medicine
N2  - Single-photon emission tomography (SPET) with the amino acid analogue l-3-[123I]iodo-α-methyl tyrosine (IMT) is helpful in the diagnosis and monitoring of cerebral gliomas. Radiolabelled amino acids seem to reflect tumour infiltration more specifically than conventional methods like magnetic resonance imaging and computed tomography. Automatic tumour delineation based on maximal tumour uptake may cause an overestimation of mean tumour uptake and an underestimation of tumour extension in tumours with circumscribed peaks. The aim of this study was to develop a program for tumour delineation and calculation of mean tumour uptake which takes into account the mean background activity and is thus optimised to the problem of tumour definition in IMT SPET. Using the frequency distribution of pixel intensities of the tomograms a program was developed which automatically detects a reference brain region and draws an isocontour region around the tumour taking into account mean brain radioactivity. Tumour area and tumour/brain ratios were calculated. A three-compartment phantom was simulated to test the program. The program was applied to IMT SPET studies of 20 patients with cerebral gliomas and was compared to the results of manual analysis by three different investigators. Activity ratios and chamber extension of the phantom were correctly calculated by the automatic analysis. A method based on image maxima alone failed to determine chamber extension correctly. Manual region of interest analysis in patient studies resulted in a mean inter-observer standard deviation of 8.7%±6.1% (range 2.7%–25.0%). The mean value of the results of the manual analysis showed a significant correlation to the results of the automatic analysis (r = 0.91, P<0.0001 for the uptake ratio; r = 0.87, P<0.0001 for the tumour area). We conclude that the algorithm proposed simplifies the calculation of uptake ratios and may be used for observer-independent evaluation of IMT SPET studies. Three-dimensional tumour recognition and transfer to co-registered morphological images based on this program may be useful for the planning of surgical and radiation treatment.
Y1  - 1998
SN  - 1619-7089
VL  - 25
IS  - 2
SP  - 150
EP  - 156
ER  - 
TY  - CHAP
A1  - Xu, Zhanping
A1  - Schwarte, Rudolf
A1  - Heinol, Horst-Guenther
A1  - Buxbaum, Bernd
A1  - Ringbeck, Thorsten
ED  - Cheung, Edmund H. M.
T1  - Smart pixel : photonic mixer device (PMD) ; new system concept of a 3D-imaging camera-on-a-chip
T2  - Proceedings : M2VIP '98; Nanjing, China, 10th - 12th September 1998
Y1  - 1998
SN  - 962-442-129-3
N1  - International Conference on Mechatronics and Machine Vision in Practice <5, 1998, Nanking> ;  M2VIP <5, 1998, Nanking>
SP  - 259
EP  - 264
CY  - Hong Kong
ER  - 
TY  - CHAP
A1  - Buxbaum, Bernd
A1  - Schwarte, Rudolf
A1  - Ringbeck, Thorsten
A1  - [u.a.], 
T1  - A new approach in optical broadband communication systems : a high integrated optical phase locked loop based on a mixing and correlating sensor, the Photonic Mixer Device (PMD)
T2  - Proceedings / OPTO 98, Internationaler Kongress und Fachausstellung für Optische Sensorik, Messtechnik und Elektronik, 18. - 20. Mai 1998, Kongresszentrum Erfurt
Y1  - 1998
N1  - Internationaler Kongress und Fachausstellung für Optische Sensorik, Messtechnik & Elektronik <3, 1998, Erfurt> ; International Congress and Exhibition on Optoelectronics, Optical Sensors and Measuring Techniques <3, 1998, Erfurt> ; OPTO <3, 1998, Erfurt>
SP  - 59
EP  - 64
PB  - ACS Organisations GmbH
CY  - Wunsdorf
ER  - 
TY  - CHAP
A1  - Schwarte, Rudolf
A1  - Buxbaum, Bernd
A1  - Heinol, Horst-Guenther
A1  - Xu, Zhanping
A1  - Ringbeck, Thorsten
A1  - Zang, Zhigang
T1  - Novel 3D-vision systems based on layout optimized PMD-structures
T2  - Proceedings / OPTO 98, Internationaler Kongress und Fachausstellung für Optische Sensorik, Messtechnik und Elektronik, 18. - 20. Mai 1998, Kongreßzentrum Erfurt
Y1  - 1998
N1  - Internationaler Kongress und Fachausstellung für Optische Sensorik, Messtechnik & Elektronik <3, 1998, Erfurt> ; International Congress and Exhibition on Optoelectronics, Optical Sensors and Measuring Techniques <3, 1998, Erfurt> ; OPTO <3, 1998, Erfurt>
SP  - 197
EP  - 202
PB  - ACS Organisations GmbH
CY  - Wunsdorf
ER  - 
TY  - CHAP
A1  - Lindemann, Markus
A1  - Runge, Alexander
T1  - Electronic contracting within the reference model for electronic markets
T2  - Proceedings of the Sixth European Conference on Information Systems, ECIS 1998, Aix-en-Provence, France, June 4-6, 1998 / Walter Baets (ed.)
Y1  - 1998
SN  - 849238333X
SP  - 44
EP  - 59
PB  - Euro-Arab Management School
ER  - 
TY  - CHAP
A1  - Schmid, Beat F.
A1  - Lindemann, Markus
T1  - Elements of a reference model for electronic markets
T2  - System sciences : proceedings. Vol. 4: Internet and the digital economy track / Thirty-first Hawaii International Conference on Systems Science : HICSS'98, Big Island of Hawaii, January 6-9, 1998 / ed. by Robert W. Blanning and David R. King. IEEE catalog ; 98TB100216
Y1  - 1998
SN  - 0-8186-8242-6
SP  - 193
EP  - 201
PB  - IEEE Computer Society Pr.
CY  - Los Alamos, CA
ER  - 
TY  - CHAP
A1  - Weber, Hans-Joachim
T1  - Applied physics of compressible and incompressible fluids
T2  - Critical care nephrology / [Hrsg.:] Claudio Ronco and Rinaldo Bellomo
Y1  - 1998
SN  - 978-94-010-6306-7
SP  - 63
EP  - 84
PB  - Springer
CY  - Dordrecht
ER  - 
TY  - CHAP
A1  - Dikta, Gerhard
T1  - Fundamentals of applied probability and basic statistics
T2  - Critical care nephrology / [Hrsg.:] Claudio Ronco and Rinaldo Bellomo
Y1  - 1998
SN  - 978-94-010-6306-7
SP  - 51
EP  - 61
PB  - Springer
CY  - Dordrecht
ER  - 
TY  - JOUR
A1  - Meliß, Michael
A1  - Neskakis, A.
A1  - Plettner-Marliani, J.
A1  - Lange, C.
A1  - Hövelmann, A.
A1  - Schumacher, J.
T1  - Waste water recycling supplied by renewable energies : basic conditions and possible treatment technologies
JF  - Renewable energy. Vol. 14 (1998), iss. 1-4. 6th Arab International Solar Energy Conference: Bringing Solar Energy into the Daylight, Muscat, Sultanate of Oman, 29.03.-01.04.1998
Y1  - 1998
SN  - 1879-0682 (E-Book); 0960-1481 (Print)
SP  - 325
EP  - 331
ER  - 
TY  - JOUR
A1  - Zientz, Evelyn
A1  - Bongaerts, Johannes
A1  - Unden, Gottfried
T1  - Fumarate regulation of gene expression in Escherichia coli by the DcuSR (dcuSR genes) two-component regulatory system
JF  - Journal of bacteriology
Y1  - 1998
SN  - 1098-5530 (E-Journal); 0021-9193 (Print)
VL  - Vol. 180
IS  - No. 20
SP  - 5421
EP  - 5425
ER  - 
TY  - JOUR
A1  - Iding, Hans
A1  - Siegert, Petra
A1  - Mesch, K.
A1  - Pohl, Martina
T1  - Application of α-keto acid decarboxylases in biotransformations
JF  - Biochimica et biophysica acta (BBA) - Protein structure and molecular enzymology
Y1  - 1998
SN  - 1879-2588 (E-Journal); 0167-4838 (Print)
VL  - Vol. 1385
IS  - Iss. 2
SP  - 307
EP  - 322
ER  - 
TY  - JOUR
A1  - Pohl, Martina
A1  - Siegert, Petra
A1  - Mesch, K.
A1  - Bruhn, H.
A1  - Grötzinger, Joachim
T1  - Active site mutants of pyruvate decarboxylase from Zymomonas mobilis : a site-directed mutagenesis study of L112, I472, I476, E473 and N482
JF  - European journal of biochemistry
Y1  - 1998
SN  - 1432-1033 (E-Journal); 1742-4658 (E-Journal); 0014-2956 (Print); 1742-464X (Print)
VL  - Vol. 257
IS  - Iss. 3
SP  - 538
EP  - 546
ER  - 
TY  - JOUR
A1  - Seibler, Jost
A1  - Schübeler, Dirk
A1  - Fiering, Steven
A1  - Groudine, Mark
A1  - Bode, Jürgen
T1  - DNA cassette exchange in ES cells mediated by Flp recombinase: an efficient strategy for repeated modification of tagged loci by marker-free constructs
JF  - Biochemistry
Y1  - 1998
U6  - http://dx.doi.org/10.1021/bi980288t
SN  - 1520-4995
VL  - 37
IS  - 18
SP  - 6229
EP  - 6234
ER  - 
TY  - JOUR
A1  - Bode, J.
A1  - Bartsch, J.
A1  - Boulikas, T.
A1  - Iber, M.
A1  - Mielke, C.
A1  - Schübeler, D.
A1  - Seibler, Jost
A1  - Benham, C.
T1  - Transcription-promoting genomic sites in mammalia: their elucidation and architectural principles
JF  - Gene therapy & molecular biology
Y1  - 1998
SN  - 1529-9120
VL  - 1
IS  - 1
SP  - 1
EP  - 29
ER  - 
TY  - JOUR
A1  - Iber, Michaela
A1  - Schübeler, Dirk
A1  - Seibler, Jost
A1  - Höxter, Maria
A1  - Bode, Jürgen
T1  - Efficient FACS selection procedure for cells undergoing Flp-mediated site-specific conversions
JF  - Technical Tips Online
Y1  - 1998
U6  - http://dx.doi.org/10.1016/S1366-2120(08)70132-6
VL  - 4
IS  - 1
SP  - 25
EP  - 29
ER  - 
TY  - CHAP
A1  - Butenweg, Christoph
A1  - Thierauf, Georg
T1  - Optimum design of reinforced concrete structures
T2  - Advances in computational structural mechanics : this volume contains a selection of papers presented at The First International Conference on Engineering Computational Technology and The Fourth International Conference on Computational Structures Technology, held in Edinburgh from 18-21 August 1998 / edited by B. H. V. Topping
Y1  - 1998
SN  - 0-948749-57-1
SP  - 447
EP  - 458
PB  - Civil-Comp Press
CY  - Edinburgh
ER  - 
TY  - CHAP
A1  - Elsen, Ingo
T1  - A pixel based approach to view based object recognition with self-organizing neural networks
T2  - IECON'98. Proceedings of the 24th Annual Conference of the IEEE Industrial Electronics Society
N2  - This paper addresses the pixel based classification of three dimensional objects from arbitrary views. To perform this task a coding strategy, inspired by the biological model of human vision, for pixel data is described. The coding strategy ensures that the input data is invariant against shift, scale and rotation of the object in the input domain. The image data is used as input to a class of self organizing neural networks, the Kohonen-maps or self-organizing feature maps (SOFM). To verify this approach two test sets have been generated: the first set, consisting of artificially generated images, is used to examine the classification properties of the SOFMs; the second test set examines the clustering capabilities of the SOFM when real world image data is applied to the network after it has been preprocessed to be invariant against shift, scale and rotation. It is shown that the clustering capability of the SOFM is strongly dependant on the invariance coding of the images.
Y1  - 1998
SN  - 0-7803-4503-7
U6  - http://dx.doi.org/10.1109/IECON.1998.724032
N1  - Aachen, 31 August 1998 - 04 September 1998
SP  - 2040
EP  - 2044
PB  - IEEE
CY  - New York
ER  -