compression testing
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- MeSH
- Evropská unie MeSH
- kompresivní punčochy normy využití MeSH
- lidé MeSH
- řízení kvality MeSH
- tlak MeSH
- vény patofyziologie patologie MeSH
- Check Tag
- lidé MeSH
Cílem studie bylo ověřit účinky kompresního prádla na výkon v modelu sportovního zatížení. Pro tuto objektivizaci jsme zvolili experimentální model využití běžného kompresního prádla, přičemž jsme zjišťovali jeho vliv na regeneraci resp. opakovaný výkon jedince mezi dvěma Wingate testy. Probandé (n=10) absolvovali dvě na sobě nezávislá vyšetření v rozmezí 1 týdne. Při prvním měření polovina probandů prošla testováním s kompresním prádlem a druhá polovina bez tohoto doplňku vždy s tří hodinovou regenerační pauzou. U druhého měření došlo ke stejnému testování, ale s opačným trendem v použití kompresního prádla. Sledovanou proměnou byl pokles výkonu při prvním a druhém měření s medicínskými kompresními punčochami a bez nich. Pilotní výzkum neprokázal signifikantně menší pokles výkonu u opakovaného Wingate testu při užití kompresních punčoch. Výsledky studie naznačují, že kompresní prádlo tohoto typu nezmenšuje únavu mezi jednotlivými opakovanými anaerobními zátěžemi a nedochází tak k nárůstu mechanického výkonu v opakovaném, krátkodobém, vysoce intenzivním cvičení.
The aim of the study was to assess the effects of compression underwear for sports performance model loads. For this objectification we chose an experimental model using conventional compression underwear while we investigated its effect on the regeneration respectively. Repeated individual's performance between the two Wingate tests. Probands ( n = 10) underwent two independent examination within 1 week. During the first half of measurement probands underwent testing with compression underwear and the other half without this add- always with a three -hour restorative break. The second measurement was the same test but with the opposite trend in the use of compression garments. Transformations of the decline in performance during the first and second measurements with medical compression stockings and without them. Pilot research has not demonstrated a significantly smaller decrease in performance with repeated Wingate test with the use of compression stockings. The study results suggest that compression garments of this type does not diminish fatigue between repeated anaerobic loads and so there is no increase in mechanical performance in repeated, short, high-intensity exercise.
- Klíčová slova
- kompresní prádlo, Wingate test, anaerobní kapacita,
- MeSH
- anaerobní práh MeSH
- cvičení * fyziologie MeSH
- kompresivní punčochy * MeSH
- laktáty metabolismus škodlivé účinky MeSH
- lidé MeSH
- monitorování fyziologických funkcí metody statistika a číselné údaje MeSH
- regenerace MeSH
- relaxace svalu fyziologie MeSH
- výkonnost MeSH
- zátěžový test MeSH
- Check Tag
- lidé MeSH
- mužské pohlaví MeSH
Compression of ECG signal is essential especially in the area of signal transmission in telemedicine. There exist many compression algorithms which are described in various details, tested on various datasets and their performance is expressed by different ways. There is a lack of standardization in this area. This study points out these drawbacks and presents new compression algorithm which is properly described, tested and objectively compared with other authors. This study serves as an example how the standardization should look like. Single-cycle fractal-based (SCyF) compression algorithm is introduced and tested on 4 different databases-CSE database, MIT-BIH arrhythmia database, High-frequency signal and Brno University of Technology ECG quality database (BUT QDB). SCyF algorithm is always compared with well-known algorithm based on wavelet transform and set partitioning in hierarchical trees in terms of efficiency (2 methods) and quality/distortion of the signal after compression (12 methods). Detail analysis of the results is provided. The results of SCyF compression algorithm reach up to avL = 0.4460 bps and PRDN = 2.8236%.
Electroencephalography (EEG) experiments typically generate vast amounts of data due to the high sampling rates and the use of multiple electrodes to capture brain activity. Consequently, storing and transmitting these large datasets is challenging, necessitating the creation of specialized compression techniques tailored to this data type. This study proposes one such method, which at its core uses an artificial neural network (specifically a convolutional autoencoder) to learn the latent representations of modelled EEG signals to perform lossy compression, which gets further improved with lossless corrections based on the user-defined threshold for the maximum tolerable amplitude loss, resulting in a flexible near-lossless compression scheme. To test the viability of our approach, a case study was performed on the 256-channel binocular rivalry dataset, which also describes mostly data-specific statistical analyses and preprocessing steps. Compression results, evaluation metrics, and comparisons with baseline general compression methods suggest that the proposed method can achieve substantial compression results and speed, making it one of the potential research topics for follow-up studies.
- MeSH
- dospělí MeSH
- elektroencefalografie * metody MeSH
- komprese dat * metody MeSH
- lidé MeSH
- neuronové sítě * MeSH
- počítačové zpracování signálu MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
STUDY DESIGN: A prospective study evaluating a cohort of patients with spondylotic cervical spine compression. OBJECTIVE: To analyze the potential of diffusion tensor imaging (DTI) of the cervical spinal cord in the detection of changes associated with spondylotic myelopathy, with particular reference to clinical and electrophysiological findings. SUMMARY OF BACKGROUND DATA: Conventional magnetic resonance imaging (MRI) may provide confusing findings because of a frequent disproportion between the degree of the spinal cord compression and clinical symptoms. The DTI is known to be more sensitive to subtle pathological changes of the spinal cord compared with conventional MRI. METHODS: The DTI of the cervical spinal cord was performed within a group of 52 patients with spondylotic spinal cord compression and 13 healthy volunteers on a 1.5-T MRI scanner. All patients underwent clinical examination that differentiated between asymptomatic and symptomatic myelopathy subgroups, and 45 patients underwent electrophysiological examination. We measured the apparent diffusion coefficient and fractional anisotropy of the spinal cord at C2/C3 level without compression and at the maximal compression level (MCL). Sagittal spinal canal diameter, cross-sectional spinal cord area, and presence of T2 hyperintensity at the MCL were also recorded. Nonparametric statistical testing was used for comparison of controls with subgroups of patients. RESULTS: Significant differences in both the DTI parameters measured at the MCL, between patients with compression and control group, were found, while no difference was observed at the noncompression level. Moreover, fractional anisotropy values were lower and apparent diffusion coefficient values were higher at the MCL in the symptomatic patients than in the asymptomatic patients. The DTI showed higher potential to discriminate between clinical subgroups in comparison with standard MRI parameters and electrophysiological findings. CONCLUSION: The DTI appears to be a promising imaging modality in patients with spondylotic spinal cord compression. It reflects the presence of symptomatic myelopathy and shows considerable potential for discriminating between symptomatic and asymptomatic patients.
- MeSH
- dospělí MeSH
- komprese míchy diagnóza etiologie patofyziologie MeSH
- krční obratle patologie patofyziologie MeSH
- lidé středního věku MeSH
- lidé MeSH
- mícha patologie MeSH
- motorické evokované potenciály fyziologie MeSH
- prospektivní studie MeSH
- senioři MeSH
- somatosenzorické evokované potenciály fyziologie MeSH
- spondylóza komplikace diagnóza patofyziologie MeSH
- zobrazování difuzních tenzorů metody MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
We propose an efficient method for compressing Vietnamese text using n-gram dictionaries. It has a significant compression ratio in comparison with those of state-of-the-art methods on the same dataset. Given a text, first, the proposed method splits it into n-grams and then encodes them based on n-gram dictionaries. In the encoding phase, we use a sliding window with a size that ranges from bigram to five grams to obtain the best encoding stream. Each n-gram is encoded by two to four bytes accordingly based on its corresponding n-gram dictionary. We collected 2.5 GB text corpus from some Vietnamese news agencies to build n-gram dictionaries from unigram to five grams and achieve dictionaries with a size of 12 GB in total. In order to evaluate our method, we collected a testing set of 10 different text files with different sizes. The experimental results indicate that our method achieves compression ratio around 90% and outperforms state-of-the-art methods.
- MeSH
- algoritmy * MeSH
- Asijci * MeSH
- komprese dat * MeSH
- lidé MeSH
- slovní zásoba * MeSH
- slovníky jako téma * MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
