171 research outputs found
Efficient Image-Space Extraction and Representation of 3D Surface Topography
Surface topography refers to the geometric micro-structure of a surface and
defines its tactile characteristics (typically in the sub-millimeter range).
High-resolution 3D scanning techniques developed recently enable the 3D
reconstruction of surfaces including their surface topography. In his paper, we
present an efficient image-space technique for the extraction of surface
topography from high-resolution 3D reconstructions. Additionally, we filter
noise and enhance topographic attributes to obtain an improved representation
for subsequent topography classification. Comprehensive experiments show that
the our representation captures well topographic attributes and significantly
improves classification performance compared to alternative 2D and 3D
representations.Comment: Initial version of the paper accepted at the IEEE ICIP Conference
201
ΠΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΎΠ½Π½Π°Ρ ΠΈΠ½ΡΡΠ°ΡΡΡΡΠΊΡΡΡΠ° ΡΡΠ½ΠΊΠ° ΠΠΠ€
The article touches information infrastructure of mutual investment fund market. The author considers the possibility of the investment units in the secondary market by using the internet-terminals of stock market. The detailed analysis of the mutual funds activities allows finding out the advantages and disadvantages before using information technologies, such as internet-terminal of stock market
PetroSurf3D - A Dataset for high-resolution 3D Surface Segmentation
The development of powerful 3D scanning hardware and reconstruction
algorithms has strongly promoted the generation of 3D surface reconstructions
in different domains. An area of special interest for such 3D reconstructions
is the cultural heritage domain, where surface reconstructions are generated to
digitally preserve historical artifacts. While reconstruction quality nowadays
is sufficient in many cases, the robust analysis (e.g. segmentation, matching,
and classification) of reconstructed 3D data is still an open topic. In this
paper, we target the automatic and interactive segmentation of high-resolution
3D surface reconstructions from the archaeological domain. To foster research
in this field, we introduce a fully annotated and publicly available
large-scale 3D surface dataset including high-resolution meshes, depth maps and
point clouds as a novel benchmark dataset to the community. We provide baseline
results for our existing random forest-based approach and for the first time
investigate segmentation with convolutional neural networks (CNNs) on the data.
Results show that both approaches have complementary strengths and weaknesses
and that the provided dataset represents a challenge for future research.Comment: CBMI Submission; Dataset and more information can be found at
http://lrs.icg.tugraz.at/research/petroglyphsegmentation
A Cadaveric Pilot Study
This study investigates the adhesion capacity of a polyglycolic acid- (PGA-)
hyaluronan scaffold with a structural modification based on a planar polymer
(PM) surface in a cadaver cartilage defect model. Two cadaver specimens were
used to serially test multiple chondral matrices. In a cadaver hip model, cell
free polymer-based cartilage implants with a planar bioinspired PM surface
(PGA-PM-scaffolds) were implanted arthroscopically on 10βmmβΓβ15βmm full-
thickness femoral hip cartilage lesions. Unprocessed cartilage implants
without a bioinspired PM surface were used as control group. The cartilage
implants were fixed without and with the use of fibrin glue on femoral hip
cartilage defects. After 50 movement cycles and removal of the distraction, a
rearthroscopy was performed to assess the outline attachment and integrity of
the scaffold. The fixation techniques without and with fibrin fixation showed
marginal differences for outline attachment, area coverage, scaffold
integrity, and endpoint fixation after 50 cycles. The PGA-PM-scaffolds with
fibrin fixation achieved a higher score in terms of the attachment, integrity,
and endpoint fixation than the PGA-scaffold on the cartilage defect. Relating
to the outline attachment, area coverage, scaffold integrity, and endpoint
fixation, the fixation with PGA-PM-scaffolds accomplished significantly better
results compared to the PGA-scaffolds . PGA-PM-scaffolds demonstrate increased
observed initial fixation strength in cadaver femoral head defects relative to
PGA-scaffold, particularly when fibrin glue is used for fixation
Arthroscopic Fixation of Cell Free Polymer-Based Cartilage Implants with a Bioinspired Polymer Surface on the Hip Joint: A Cadaveric Pilot Study
This study investigates the adhesion capacity of a polyglycolic acid-(PGA-) hyaluronan scaffold with a structural modification based on a planar polymer (PM) surface in a cadaver cartilage defect model. Two cadaver specimens were used to serially test multiple chondral matrices. In a cadaver hip model, cell free polymer-based cartilage implants with a planar bioinspired PM surface (PGA-PM-scaffolds) were implanted arthroscopically on 10 mm x 15 mm full-thickness femoral hip cartilage lesions. Unprocessed cartilage implants without a bioinspired PM surface were used as control group. The cartilage implants were fixed without and with the use of fibrin glue on femoral hip cartilage defects. After 50 movement cycles and removal of the distraction, a rearthroscopy was performed to assess the outline attachment and integrity of the scaffold. The fixation techniques without and with fibrin fixation showed marginal differences for outline attachment, area coverage, scaffold integrity, and endpoint fixation after 50 cycles. The PGA-PM-scaffolds with fibrin fixation achieved a higher score in terms of the attachment, integrity, and endpoint fixation than the PGA-scaffold on the cartilage defect. Relating to the outline attachment, area coverage, scaffold integrity, and endpoint fixation, the fixation with PGA-PM-scaffolds accomplished significantly better results compared to the PGA-scaffolds (P = 0.03752, P = 0.03078, P = 0.00512, P = 0.00512). PGA-PM-scaffolds demonstrate increased observed initial fixation strength in cadaver femoral head defects relative to PGA-scaffold, particularly when fibrin glue is used for fixation
Towards Digital Twin-enabled DevOps for CPS providing Architecture-Based Service Adaptation & Verification at Runtime
Industrial Product-Service Systems (IPSS) denote a service-oriented (SO) way
of providing access to CPS capabilities. The design of such systems bears high
risk due to uncertainty in requirements related to service function and
behavior, operation environments, and evolving customer needs. Such risks and
uncertainties are well known in the IT sector, where DevOps principles ensure
continuous system improvement through reliable and frequent delivery processes.
A modular and SO system architecture complements these processes to facilitate
IT system adaptation and evolution. This work proposes a method to use and
extend the Digital Twins (DTs) of IPSS assets for enabling the continuous
optimization of CPS service delivery and the latter's adaptation to changing
needs and environments. This reduces uncertainty during design and operations
by assuring IPSS integrity and availability, especially for design and service
adaptations at CPS runtime. The method builds on transferring IT DevOps
principles to DT-enabled CPS IPSS. The chosen design approach integrates,
reuses, and aligns the DT processing and communication resources with DevOps
requirements derived from literature. We use these requirements to propose a
DT-enabled self-adaptive CPS model, which guides the realization of DT-enabled
DevOps in CPS IPSS. We further propose detailed design models for
operation-critical DTs that integrate CPS closed-loop control and
architecture-based CPS adaptation. This integrated approach enables the
implementation of A/B testing as a use case and central concept to enable CPS
IPSS service adaptation and reconfiguration. The self-adaptive CPS model and DT
design concept have been validated in an evaluation environment for
operation-critical CPS IPSS. The demonstrator achieved sub-millisecond cycle
times during service A/B testing at runtime without causing CPS operation
interferences and downtime.Comment: Final published version appearing in 17th Symposium on Software
Engineering for Adaptive and Self-Managing Systems (SEAMS 2022
ΠΡΠΎΠ±Π»Π΅ΠΌΡ ΡΠ½Π΅ΡΠ³Π΅ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΈ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ Π±Π΅Π·ΠΎΠΏΠ°ΡΠ½ΠΎΡΡΠΈ: Π°Π»ΡΡΠ΅ΡΠ½Π°ΡΠΈΠ²Π½Π°Ρ ΠΈΠ»ΠΈ ΡΡΠ°Π΄ΠΈΡΠΈΠΎΠ½Π½Π°Ρ ΡΠ½Π΅ΡΠ³Π΅ΡΠΈΠΊΠ°
Π Π΄Π°Π½Π½ΠΎΠΉ ΡΡΠ°ΡΡΠ΅ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡΡΡ ΠΏΡΠΈΡΠΈΠ½Ρ, ΠΏΠΎ ΠΊΠΎΡΠΎΡΡΠΌ ΠΌΠΈΡΠΎΠ²Π°Ρ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΠΊΠ° Π½Π΅ ΠΌΠΎΠΆΠ΅Ρ ΠΏΠ΅ΡΠ΅ΠΉΡΠΈ Π½Π° Π°Π»ΡΡΠ΅ΡΠ½Π°ΡΠΈΠ²Π½ΡΡ ΡΠ½Π΅ΡΠ³Π΅ΡΠΈΠΊΡ. Π Π ΠΎΡΡΠΈΠΈ ΠΏΠ΅ΡΠ΅Ρ
ΠΎΠ΄ Π½Π° Π°Π»ΡΡΠ΅ΡΠ½Π°ΡΠΈΠ²Π½ΡΡ ΡΠ½Π΅ΡΠ³Π΅ΡΠΈΠΊΡ ΠΏΡΠΈΠ²Π΅Π΄Π΅Ρ Π½Π΅ ΡΠΎΠ»ΡΠΊΠΎ ΠΊ ΡΠΎΡΠΈΠ°Π»ΡΠ½ΠΎΠΉ ΠΈ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ Π½Π΅ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΠΎΡΡΠΈ, Π½ΠΎ ΠΈ ΠΊ ΡΠ³ΡΠΎΠ·Π΅ Π½Π°ΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠΉ Π±Π΅Π·ΠΎΠΏΠ°ΡΠ½ΠΎΡΡΠΈ ΡΡΡΠ°Π½Ρ Ρ Π½Π°ΠΏΡΡΠΆΠ΅Π½Π½ΡΠΌΠΈ ΠΌΠ΅ΠΆΠ΄ΡΠ½Π°ΡΠΎΠ΄Π½ΡΠΌΠΈ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡΠΌΠΈ. Π’Π°ΠΊΠΎΠΉ ΡΠ°ΠΊΡΠΎΡ ΠΊΠ°ΠΊ ΡΠ°Π·Π²ΠΈΡΠΈΠ΅ ΡΡΠ°Π΄ΠΈΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΡΠΎΠΏΠ»ΠΈΠ²Π½ΠΎ-ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ° ΠΏΠΎΠΌΠΎΠΆΠ΅Ρ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠΈΡΡ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΡΡ Π±Π΅Π·ΠΎΠΏΠ°ΡΠ½ΠΎΡΡΡ Π ΠΎΡΡΠΈΠΈ
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