587 research outputs found
LiDAR-assisted Large-scale Privacy Protection in Street-view Cycloramas
Recently, privacy has a growing importance in several domains, especially in
street-view images. The conventional way to achieve this is to automatically
detect and blur sensitive information from these images. However, the
processing cost of blurring increases with the ever-growing resolution of
images. We propose a system that is cost-effective even after increasing the
resolution by a factor of 2.5. The new system utilizes depth data obtained from
LiDAR to significantly reduce the search space for detection, thereby reducing
the processing cost. Besides this, we test several detectors after reducing the
detection space and provide an alternative solution based on state-of-the-art
deep learning detectors to the existing HoG-SVM-Deep system that is faster and
has a higher performance.Comment: Accepted at Electronic Imaging 201
Aggregated Deep Local Features for Remote Sensing Image Retrieval
Remote Sensing Image Retrieval remains a challenging topic due to the special
nature of Remote Sensing Imagery. Such images contain various different
semantic objects, which clearly complicates the retrieval task. In this paper,
we present an image retrieval pipeline that uses attentive, local convolutional
features and aggregates them using the Vector of Locally Aggregated Descriptors
(VLAD) to produce a global descriptor. We study various system parameters such
as the multiplicative and additive attention mechanisms and descriptor
dimensionality. We propose a query expansion method that requires no external
inputs. Experiments demonstrate that even without training, the local
convolutional features and global representation outperform other systems.
After system tuning, we can achieve state-of-the-art or competitive results.
Furthermore, we observe that our query expansion method increases overall
system performance by about 3%, using only the top-three retrieved images.
Finally, we show how dimensionality reduction produces compact descriptors with
increased retrieval performance and fast retrieval computation times, e.g. 50%
faster than the current systems.Comment: Published in Remote Sensing. The first two authors have equal
contributio
Bootstrapped CNNs for Building Segmentation on RGB-D Aerial Imagery
Detection of buildings and other objects from aerial images has various
applications in urban planning and map making. Automated building detection
from aerial imagery is a challenging task, as it is prone to varying lighting
conditions, shadows and occlusions. Convolutional Neural Networks (CNNs) are
robust against some of these variations, although they fail to distinguish easy
and difficult examples. We train a detection algorithm from RGB-D images to
obtain a segmented mask by using the CNN architecture DenseNet.First, we
improve the performance of the model by applying a statistical re-sampling
technique called Bootstrapping and demonstrate that more informative examples
are retained. Second, the proposed method outperforms the non-bootstrapped
version by utilizing only one-sixth of the original training data and it
obtains a precision-recall break-even of 95.10% on our aerial imagery dataset.Comment: Published at ISPRS Annals of the Photogrammetry, Remote Sensing and
Spatial Information Science
Temperature dependent graphene suspension due to thermal Casimir interaction
Thermal effects contributing to the Casimir interaction between objects are
usually small at room temperature and they are difficult to separate from
quantum mechanical contributions at higher temperatures. We propose that the
thermal Casimir force effect can be observed for a graphene flake suspended in
a fluid between substrates at the room temperature regime. The properly chosen
materials for the substrates and fluid induce a Casimir repulsion. The balance
with the other forces, such as gravity and buoyancy, results in a stable
temperature dependent equilibrium separation. The suspended graphene is a
promising system due to its potential for observing thermal Casimir effects at
room temperature.Comment: 5 pages, 4 figures, in APL production 201
Minimally invasive osteosynthesis of fractures of the tibial condyles
ΠΠ‘Π’ΠΠΠ‘ΠΠΠ’ΠΠ ΠΠΠ ΠΠΠΠΠΠΠΠ ΠΠΠΠΠ ΠΠΠΠΠΠΠΠΠΠΠ¦ΠΠ― ΠΠΠ£Π’Π ΠΠΠΠ―Π―Π₯ΠΠ Π£Π ΠΠΠ§ΠΠ‘ΠΠΠ ΠΠΠΠ ΠΠ¦ΠΠ ΠΠΠΠΠΠΠΠΠΠΠΠΠ«ΠΠΠΠΠ¬Π¨ΠΠΠΠ Π¦ΠΠΠΠ ΠΠΠ‘Π’Π ΠΠΠ ΠΠΠΠΠ« /Π₯ΠΠ ΠΠΠΠΠ§ΠΠΠ‘Π’Π ΠΠΠΠΠΠ Π’Π ΠΠΠΠ« /Π₯ΠΠ ΠΠΠ ΠΠΠΠΠ« /Π₯ΠΠ Π¦Π΅Π»Ρ. ΠΡΠΎΠ²Π΅ΡΡΠΈ ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² ΠΌΠ°Π»ΠΎΠΈΠ½Π²Π°Π·ΠΈΠ²Π½ΠΎΠ³ΠΎ ΠΈ ΡΡΠ°Π΄ΠΈΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΎΡΠΊΡΡΡΠΎΠ³ΠΎ ΠΎΡΡΠ΅ΠΎΡΠΈΠ½ΡΠ΅Π·Π° Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΠ°ΠΌΠΈ ΠΌΡΡΠ΅Π»ΠΊΠΎΠ² Π±ΠΎΠ»ΡΡΠ΅Π±Π΅ΡΡΠΎΠ²ΠΎΠΉ ΠΊΠΎΡΡΠΈ. ΠΠ°ΡΠ΅ΡΠΈΠ°Π» ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. Π Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠΌΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° Ρ
ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΠΎΠ² ΠΌΡΡΠ΅Π»ΠΊΠΎΠ² Π±ΠΎΠ»ΡΡΠ΅Π±Π΅ΡΡΠΎΠ²ΠΎΠΉ ΠΊΠΎΡΡΠΈ ΠΏΠ°ΡΠΈΠ΅Π½ΡΡ Π±ΡΠ»ΠΈ ΡΠ°Π·Π΄Π΅Π»Π΅Π½Ρ Π½Π° Π΄Π²Π΅ Π³ΡΡΠΏΠΏΡ. Π ΠΏΠ΅ΡΠ²ΠΎΠΉ Π³ΡΡΠΏΠΏΠ΅ (n=70) ΠΏΡΠΈΠΌΠ΅Π½ΡΠ»Π°ΡΡ ΠΎΡΠΊΡΡΡΠ°Ρ ΡΠ΅ΠΏΠΎΠ·ΠΈΡΠΈΡ ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΠ° Ρ Π²Π½ΡΡΡΠ΅Π½Π½Π΅ΠΉ ΡΠΈΠΊΡΠ°ΡΠΈΠ΅ΠΉ. ΠΠΎ Π²ΡΠΎΡΠΎΠΉ Π³ΡΡΠΏΠΏΠ΅ (n=70) ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½Ρ ΠΌΠ°Π»ΠΎΠΈΠ½Π²Π°Π·ΠΈΠ²Π½ΡΠ΅ ΠΌΠ΅ΡΠΎΠ΄Ρ Π»Π΅ΡΠ΅Π½ΠΈΡ: Π·Π°ΠΊΡΡΡΠ°Ρ ΡΠ΅ΠΏΠΎΠ·ΠΈΡΠΈΡ ΠΈ ΡΡΠ΅ΡΠΊΠΎΠΆΠ½Π°Ρ ΡΠΈΠΊΡΠ°ΡΠΈΡ ΠΊΠ°Π½ΡΠ»ΠΈΡΠΎΠ²Π°Π½Π½ΡΠΌΠΈ Π²ΠΈΠ½- ΡΠ°ΠΌΠΈ, ΡΠ΅ΠΏΠΎΠ·ΠΈΡΠΈΡ ΡΠ΅ΡΠ΅Π· ΡΡΠ΅ΠΏΠ°Π½Π°ΡΠΈΠΎΠ½Π½ΠΎΠ΅ ΠΎΠΊΠ½ΠΎ c ΡΠΈΠΊΡΠ°ΡΠΈΠ΅ΠΉ Π²ΠΈΠ½ΡΠ°ΠΌΠΈ/ΠΏΠ»Π°ΡΡΠΈΠ½ΠΎΠΉ, ΠΌΠ°Π»ΠΎΠΈΠ½Π²Π°Π·ΠΈΠ²Π½ΡΠΉ ΠΎΡΡΠ΅ΠΎΡΠΈΠ½ΡΠ΅Π· ΠΏΠ»Π°ΡΡΠΈΠ½Π°ΠΌΠΈ, Π°ΡΡΡΠΎΡΠΊΠΎΠΏΠΈΡΠ΅ΡΠΊΠΈ Π°ΡΡΠΈΡΡΠΈΡΠΎΠ²Π°Π½Π½ΡΠΉ ΠΎΡΡΠ΅ΠΎΡΠΈΠ½ΡΠ΅Π·. Π ΡΡΠ°Π²Π½ΠΈΠ²Π°Π΅ΠΌΡΡ
Π³ΡΡΠΏΠΏΠ°Ρ
ΠΎΡΠ΅Π½ΠΈΠ²Π°Π»ΠΈ ΡΠ»Π΅Π΄ΡΡΡΠΈΠ΅ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΠΈ: Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ, ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠΉ ΡΠ΅Π·ΡΠ»ΡΡΠ°Ρ Π»Π΅ΡΠ΅Π½ΠΈΡ, ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠ΅ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ Π½ΠΈΠΆΠ½Π΅ΠΉ ΠΊΠΎΠ½Π΅ΡΠ½ΠΎΡΡΠΈ, Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡ Π²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ Π½Π΅ΡΡΡΠ΄ΠΎΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΠΈ. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΠΌΠ°Π»ΠΎΠΈΠ½Π²Π°Π·ΠΈΠ²Π½ΡΡ
Ρ
ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΠΎΠ² ΠΌΡΡΠ΅Π»ΠΊΠΎΠ² Π±ΠΎΠ»ΡΡΠ΅Π±Π΅ΡΡΠΎΠ²ΠΎΠΉ ΠΊΠΎΡΡΠΈ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΡΠΎΠΊΡΠ°ΡΠΈΡΡ Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ c 100 (90-120) Π΄ΠΎ 70 (60-90) ΠΌΠΈΠ½ΡΡ (Me (25%-75%), ΠΎΠ΄Π½Π°ΠΊΠΎ Π½Π΅ Π²Π»ΠΈΡΠ΅Ρ Π½Π° ΠΊΠ°ΡΠ΅ΡΡΠ²ΠΎ ΡΠ΅ΠΏΠΎΠ·ΠΈΡΠΈΠΈ ΠΈ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ ΠΈΠ½ΡΠ΅ΠΊΡΠΈΠΎΠ½Π½ΡΡ
ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΠΉ. Π’Π°ΠΊΠΆΠ΅ ΠΎΡΠΌΠ΅ΡΠ΅Π½ΠΎ, ΡΡΠΎ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΌΠ°Π»ΠΎΠΈΠ½Π²Π°Π·ΠΈΠ²Π½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΠΎΡΡΠ΅ΠΎΡΠΈΠ½ΡΠ΅Π·Π° ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΠΎΠ² ΠΌΡΡΠ΅Π»ΠΊΠΎΠ² Π±ΠΎΠ»ΡΡΠ΅Π±Π΅ΡΡΠΎΠ²ΠΎΠΉ ΠΊΠΎΡΡΠΈ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΡΠΎΠΊΡΠ°ΡΠΈΡΡ Π²ΡΠ΅ΠΌΡ Π²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ Π½Π΅ΡΡΡΠ΄ΠΎΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΠΈ c 24 (22-41) Π½Π΅Π΄Π΅Π»Ρ Π΄ΠΎ 21 (17-33,5) (Me (25%-75%)) ΠΈ Π΄ΠΎΡΡΠΈΡΡ Π»ΡΡΡΠΈΡ
ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΡ
ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ ΡΡΠ°Π΄ΠΈΡΠΈΠΎΠ½Π½ΡΠΌΠΈ ΠΎΡΠΊΡΡΡΡΠΌΠΈ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ Π»Π΅ΡΠ΅Π½ΠΈΡ. ΠΠ·ΡΡΠ΅Π½ΠΈΠ΅ ΠΎΡΠ΄Π°Π»Π΅Π½Π½ΡΡ
ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΏΠΎΠΊΠ°Π·Π°Π»ΠΎ, ΡΡΠΎ ΠΎΠ±Π° ΠΌΠ΅ΡΠΎΠ΄Π° Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡ Π΄ΠΎΡΡΠΈΡΡ ΡΠ΄ΠΎΠ²Π»Π΅ΡΠ²ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΡΠ΅ΠΏΠΎΠ·ΠΈΡΠΈΠΈ ΠΊΠΎΡΡΠ½ΡΡ
ΡΡΠ°Π³ΠΌΠ΅Π½ΡΠΎΠ². ΠΡΠΈ ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΠ°Ρ
ΡΠΈΠΏΠ° Schatzker 1 ΠΈ 2 Π²ΡΡΠ²Π»Π΅Π½Ρ ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ²Π° ΠΌΠ°Π»ΠΎΠΈΠ½Π²Π°Π·ΠΈΠ²Π½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² Π»Π΅ΡΠ΅- Π½ΠΈΡ. ΠΠ°ΡΠ΅ΡΡΠ²ΠΎ ΡΠ΅ΠΏΠΎΠ·ΠΈΡΠΈΠΈ ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΠΎΠ² ΡΠΈΠΏΠ° Schatzker 3-6 Π² ΠΎΠ±Π΅ΠΈΡ
Π³ΡΡΠΏΠΏΠ°Ρ
ΡΠΎΠΏΠΎΡΡΠ°Π²ΠΈΠΌΠΎ. Π‘Π»Π΅Π΄ΡΠ΅Ρ ΠΎΡΠΌΠ΅ΡΠΈΡΡ, ΡΡΠΎ Π½Π΅Π·Π°Π²ΠΈΡΠΈΠΌΠΎ ΠΎΡ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½Π½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° Π»Π΅ΡΠ΅Π½ΠΈΡ ΡΠ΅ΠΏΠΎΠ·ΠΈΡΠΈΡ Π±ΠΈΠΊΠΎΠ½Π΄ΠΈΠ»ΡΡΠ½ΡΡ
ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΠΎΠ² (Schatzker 5, 6) ΡΠΎΠΏΡΠΎΠ²ΠΎΠΆΠ΄Π°Π»Π°ΡΡ Ρ
ΡΠ΄ΡΠΈΠΌ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠΌ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠΌ ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ°ΠΌΠΈ ΠΎΠ΄Π½ΠΎΠΌΡΡΠ΅Π»ΠΊΠΎ- Π²ΡΡ
ΠΏΠΎΠ²ΡΠ΅ΠΆΠ΄Π΅Π½ΠΈΠΉ. ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅. ΠΡΠΎΠ²Π΅Π΄Π΅Π½Π½ΠΎΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠ΄ΠΈΠ»ΠΎ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ ΠΌΠ°Π»ΠΎΠΈΠ½Π²Π°Π·ΠΈΠ²Π½ΡΡ
Ρ
ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² Π² Π»Π΅ΡΠ΅Π½ΠΈΠΈ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ ΠΏΠ΅ΡΠ΅Π»ΠΎΠΌΠ°ΠΌΠΈ ΠΌΡΡΠ΅Π»ΠΊΠΎΠ² Π³ΠΎΠ»Π΅Π½ΠΈ.Objectives. To carry out a comparative analysis of the results of minimally invasive and traditional open osteosynthesis in patients with fractures of the tibial condyles. Methods. The patients were divided into two groups depending on the performed surgical treatment method of the fractures of the tibial condyles. In the first group (n=70) the open reposition of the fracture with the internal fixation was applied. In the second group (n=70) minimally invasive treatment methods were used: the closed reposition and percutaneous fixation with cannulated screws, reposition through the trepanation window with screws/plate fixation, minimally invasive osteosynthesis by plates, arthroscopically-assisted osteosynthesis. The following parameters were evaluated in the compared groups: the duration of the operation, the radiographic result of the treatment, the functional condition of the lower limb and the duration of temporary work incapacity. Results. It has been found out that use of minimally invasive surgical treatment of fractures of the tibial condyles reduces the operative time from 100 (90-120) to 70 (60-90) minutes, but does not affect the quality of the reposition, and the number of infectious complications. It is also noted that the use of minimally invasive osteosynthesis of fractures of the tibial condyles permits to reduce the time of temporary disability from 24 (22-41) weeks to 21 (17-33,5) and achieve better functional outcomes compared with traditional open procedures. The study of long-term radiographic results of treatment showed that both methods of treatment permit to achieve a satisfactory reposition of bone fragments. In Schatzker type I and II fracture the advantages of minimally invasive treatment methods have been determined. The quality of reposition of Schatzker type III and VI fracture in both groups is comparable. It should be pointed out that regardless of the treatment technique used, reposition of the bicondylar fractures (Schatzker type V and VI) was accompanied by worse radiological outcomes in comparison with the results of single condyle damage. Conclusion. The performed research has proved the efficacy of minimally invasive surgical procedures for the treatment of patients with tibial condylar fractures
Symbolic-numeric approach for solving linear differential equations of the fourth order
This paper presents a symbolic-numeric approach for solving linear differential equations of the fourth order in the form of generalized power series. The working program allows to find solutions to differential equations of the fourth order in the form of power series, generally, of any order, but is limited by capabilities of a given computer. Some examples of solving differential equations of the fourth order are presented, which show the efficiency of the developed progra
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