Compression Type Research Articles

24-hour interval compression: a plan to balance effectiveness and tolerability for chronic oedema

As one of the mainstays for the management of chronic oedema, compression is unquestionably an efficacious and important element in treatment pathways during the intensive acute, transition and maintenance phases. Despite the variety of compression technologies on the market, devices to aid application and innovative methods employed by caregivers to encourage adherence to treatment, concordance remain a challenge. Balancing clinical effectiveness and patient comfort, the 24-hour interval plan considers wearer lifestyle and treatment options to tailor types of compression and times during the day and night when compression is worn. This article reviews previously published theories and evidence on which the 24-hour compression plan has been based (Bock et al, 2022).

Maximal Regularity for Compressible Two-Fluid System

We investigate a compressible two-fluid Navier-Stokes type system with a single velocity field and algebraic closure for the pressure law. The constitutive relation involves densities of both fluids through an implicit function. We are interested in regular solutions in a $L_p-L_q$ maximal regularity setting. We show that such solutions exists locally in time and, under additional smallness assumptions on the initial data, also globally. Our proof rely on appropriate transformation of the original problem, application of Lagrangian coordinates and maximal regularity estimates for associated linear problem.

Purely venous compression in trigeminal neuralgia—can we predict the outcome of surgery

PurposeControversies regarding venous compression and trigeminal neuralgia (TN) still exist. The study demonstrates our experience for microvascular decompression (MVD) in TN caused by purely venous compression. The goal was to identify prognostic anatomical or surgical factors that may influence the outcome.MethodsBetween 2004 and 2020, 49 patients were operated with purely venous compression. Average age was 58.4 years. Mean history of TN was 7.8 years. Microsurgical procedures included transposition or separation of the vein, coagulation, and division. Several features have been analyzed with respect to BNI scores.ResultsEvaluation on discharge revealed a complete pain relief in 39 (80%), partial improvement in 7 (14%), and no benefit in 3 (6%) patients. Facial hypesthesia was reported by 14 (28.6%) patients. Mean follow-up (FU) was 42.1 months. BNI pain intensity score on FU revealed 71.4% excellent to very good scores (score 1: 32 (65.3%); 2: 3 (6.1%)). BNI facial numbness score 2 could be detected in 13 patients (26.5%) during FU. There was no statistical relationship between immediate pain improvement or BNI pain intensity score on FU with respect to surgical procedure, size of trigeminal cistern, type of venous compression, venous caliber, trigeminal nerve indentation, or neurovascular adherence. BNI facial numbness score was dependent on type of venous compression (p < 0.05).ConclusionWe did not find typical anatomical features that could either predict or influence the outcome regarding pain improvement or resolution in any form. Neither classic microvascular decompression (interposition/transposition) nor sacrificing the offending vein made any difference in outcome.

Different Type of Image Compression using Various techniques, Highlighting Segmentation based image Compression

Abstract: Image compression (IC) plays an important part in Digital Image Processing (DIP), it is as well very very essential for effective transmission and storing of images. Image Compression (IC), is basically recusing the size of an image and that too without adjusting the quality of the picture. It is kind of software with records pressure on digital Image. The objective is to lessen reiteration of the picture info for you to be accomplished of store or transmit information in a proficient shape. This paper gives review of kinds of images and its compression strategies. An image, in its genuine form, conveys big extent of data which requiress no longer finest large quantity of memory provisions for its garage but moreover causes difficult transmission over limited bandwidth channel. So, one of the acute factors for picture storage space or transmission over any exchange media is Image Compression. Image Compression makes it possible for increasing file sizes of practicable, storable and communicable dimensions. Keywords: Image Compression; segmentation based image compression component; formatting; Lossless compression; Lossy compression; techniques.

Experimental study of high-speed air intake performance by side clearance

Japan Aerospace Exploration Agency (JAXA) and universities plan the “High Mach Integrated Control Experiment” (HIMICO), which is a hypersonic flight test by JAXA's S-520 sounding rocket. The experimental aircraft for HIMICO is powered by a ramjet engine, whose intake is a rectangular mixed compression type with a design Mach number of 5.In this research, the effects of the side clearance (SC) on the intake performance are investigated at Mach 3.4 by supersonic wind tunnel tests. The side clearances are thin slits between the 2nd and 3rd ramps and sidewalls, which is provided for driving the variable geometry intake. Three types of models with different SC widths were compared. As the results, it is found that the 2nd ramp SC, which is located upstream of the throat, causes the performance deterioration and the 3rd ramp SC, which is located downstream of the throat can expand the starting range. Hybrid SC which has only the 3rd ramp SC obtains sufficient Mass Capture Ratio (MCR) and maintains the start condition over a wider nozzle throat height range due to the air bleed from the 3rd ramp SC. However, the performance of Hybrid SC deteriorates when adding the sideslip angle, β=5°, because of a leakage from the bleed slit located between the 2nd and 3rd ramps.

Contributions of Pubic Rami Fracture Morphology and Fixation to Pelvic Ring Stability in Type 1 Lateral Compression Injuries: A Biomechanical Cadaveric Study.

Treatment of lateral compression type 1 (LC-1) injuries has historically been nonoperative with immediate weight-bearing. However, management of these injuries remains controversial, with reports of displacement at follow-up for nonoperatively managed LC-1 fractures. The goal of our study was to determine the effect of superior pubic ramus fracture morphology and fixation construct on pelvic stability. Ten fresh-frozen cadaveric were transected into hemi-pelvises. Incomplete Denis type 1 sacral fractures were made. Hemi-pelvises were randomized to receive a transverse-type or oblique-type superior pubic ramus fracture with the contralateral hemi-pelvis receiving the opposing morphology. A lateral load to 135N was applied with an Instron materials testing machine and lateral displacement of the hemi-pelvis was recorded. Deflection and stiffness were calculated. Statistical analysis was conducted using a t test assuming unequal variances with an alpha = 0.05. Oblique-type superior pubic ramus fractures allowed more deflection compared with transverse-type fractures in the absence of fixation (P = 0.018). The posterior-only and combined anterior and posterior fixation configurations on average reduced deflection more than no fixation or anterior fixation only. In all fixation configuration cases, the average deflection for transverse-type fractures was less than that of the oblique-type fractures. Our findings suggest that displacement of LC-1 pelvic injuries may be related to pubic rami fracture morphology. When looking at initial injury imaging, oblique-type pubic rami fractures may suggest an increased potential for displacement over time. In such cases, we recommend an examination under anesthesia to evaluate for underlying instability and consideration for fixation. Therapeutic Level V.

Numerical study and proposal of new design equations for steel decking concrete slabs subjected to fire

This paper presents a numerical study on structurally continuous steel decking concrete slabs subjected to fire. This is an important subject for improving the fire design methods of this type of elements. Slabs with tension, compression and/or both steel reinforcement types have been tested. The results of twelve full-scale slab fire resistance tests carried out by the authors have been used in the calibration of the numerical models. Despite the compression rebars being more thermally protected, the use of tension rebars proved to be a good design solution, because just from the initial 5 min of fire, a detachment of the steel deck was registered. In this sense, slabs without tension rebars performed like a non-reinforced concrete slab. The detachment of the steel decking suggests that this type of slabs should not be fire designed as a composite element. There is no interaction between the steel decking and the concrete just from the beginning of the fire exposure. Nevertheless, when the steel decking detaches and stops contributing to the mechanical resistance of the slab, it continues to work as a thermal barrier. Another important conclusion is that the simple calculation method of EN 1994–1-2 needs an update for taking into account these phenomena. A new methodology for the mechanical and thermal design of these slabs in case of fire is proposed.

Mathematical modeling of the osteosynthesis of the lower leg bones using a titanium mesh for their congenital pseudoarthrosis in the lower third

Background. Congenital pseudarthrosis of the lower leg bones belongs to the group of orphan diseases and manifests itself in non-union (pseudarthrosis) of the lower leg bones, which leads to the formation of deformity and shortening of the limb, and, as a result, is accompanied by a persistent violation of the limb’s supportability. To date, the question of choosing a surgical technique and optimal fixation in the surgical treatment of congenital pseudarthrosis of the lower leg bones remains unresolved. The purpose was to investigate the stress-strain state of the shin model with pseudarthrosis of its bones in the lower third during their osteosynthesis using a titanium mesh. Materials and methods. Osteosynthesis was simulated with an intramedullary nail, wires, and a block of bone grafts on both shin bones with the imposition of a titanium mesh over the grafts under the influence of two types of compression and torsion loads. Results. Studies have shown that additional fixation of the bone graft block with a titanium mesh allows reducing the stress level at almost all control points of the model of osteosynthesis of the lower leg bones in their congenital pseudarthrosis, both under compression and torsion. As the most positive changes, we can note a decrease in the stress values on the tibia around the nonunion line. This can be explained by the fact that the bone graft block reinforced with a titanium mesh takes on a great load. The same fact contributes to the increase in the level of stress at the lower border of the graft block and tibia. The negative factors include an increase in the level of stress along the line of non-union of the fibula. This is also explained by an increase in the modulus of elasticity of the bone graft block, which further loads the fibula. Conclusions. The use of a titanium mesh for additional fixation of the shin bones in the treatment of their congenital pseudarthrosis has a positive effect on the stress-strain state of the model, which is confirmed by a decrease in the stress level at almost all control points of the model, both under compression and torsion loads. The most positive changes are observed along the line of non-union of the tibia.

Efficient Visualization of Whole Slide Images in Web-based Viewers for Digital Pathology.

Wide adoption of digital pathology requires efficient visualization and navigation in Web-based digital slide viewers, which is poorly defined. To define and quantify relevant performance metrics for efficient visualization of cases and slides in digital slide viewers. With a universal slide viewer used in clinical routine diagnostics, we evaluated the impact of slide caching, compression type, tile, and block size of whole slide images generated from Philips, Leica, and 3DHistech scanners on streaming performance on case, slide, and field of view levels. Two hundred thirty-nine pathologists routinely reviewed 60 080 whole slide images over 3 months. The median time to open a case's slides from the laboratory information system was less than 4 seconds, the time to change to a slide within the case was less than 1 second, and the time to render the adjacent field of view when navigating the slide was less than one-quarter of a second. A whole slide image's block size and a viewer tile size of 1024 pixels showed best performance to display a field of view and was preferrable over smaller tiles due to fewer mosaic effects. For Philips, fastest median slide streaming pace was 238 ms per field of view and for 3DHistech, 125 ms. For Leica, the fastest pace of 108 ms per field of view was established with block serving without decompression. This is the first study to systematically assess user-centric slide visualization performance metrics for digital viewers, including time to open a case, time to change a slide, and time to change a field of view. These metrics help to improve the viewer's configuration, leading to an efficient visualization baseline that is widely accepted among pathologists using routine digital pathology.

Analysis of the adequacy of infant cardiopulmonary resuscitation according to chest compression technique based on the 2020 AHA guidelines

The quantitative and qualitative differences between the two-finger (TF) and two-thumb-encircling hands (TT) techniques were not sufficiently investigated to determine which is more effective for single-rescuer infant cardiopulmonary resuscitation (CPR). As the type of chest compression (CC) technique can impact survival rates and prognoses of patients, this study aimed to compare the adequacy of single-rescuer infant CPR CC techniques and explore participants’ CPR experiences using an exploratory sequential mixed methods design. To assess the adequacy of CC and ventilation according to technique, 70 students who completed basic life support provider certification among students from emergency medical services and nursing departments of a single college performed CC using the TF and TT techniques (4 sets of 5 cycles with a ratio of 30:2) in simulation. Meanwhile, a numeric rating scale was used to measure fatigue. SPSS (v. 25.0, IBM Corp, Armonk, NY, USA) was used to analyze the collected data by frequency analysis, descriptive statistics, paired t-test, and repeated measures analysis of variance (ANOVA). We conducted focus group interviews and analyzed CPR experiences. There were statistically significant differences between the TF and TT techniques in fatigue score (6.09 vs. 4.23 points, p &lt; 0.001), average hands-off time (6.77 vs. 7.43 s, p =0.001), mean ventilation volume (41.40 vs. 35.51 ml, p = 0.002), CC accuracy rate (65.89% vs. 77.11%, p = 0.011), mean CC rate (104.37 vs. 107.11 beats/min, p = 0.020), overall CPR score (78.26 vs. 84.37 points, p = 0.005), and overall compression score (82.60 vs. 92.54 points, p &lt; 0.001). Furthermore, we found significant differences over time in mean CC count (p = 0.030), mean ventilation volume (p = 0.042), and mean hands-off time (p = 0.029). Two categories (ambivalent attitudes and perception of pain) and five sub-categories were derived based on the results. In conclusion, as stated in the 2020 American Heart Association (AHA) guidelines, both TF and TT techniques are useful for single-rescuer infant CPR. Overall, TT technique provides higher quality of compressions at the cost of fewer ventilations. We recommend future studies of more diverse groups and techniques.

Використання інноваційних технологій у процесі професійно орієнтованого навчання іноземних студентів економічних спеціальностей

The rapid development of the society requires changes in technologies and methods of the educational process. Therefore, the implementation of innovative technologies aimed at individual approach, mobility and distance in education is necessary and inevitable. In this regard, modern higher education institutions must radically change their educational objectives, update the content of education, implement innovative technologies in the development of student personality as a subject aimed at developing a competent person who is creative in solving problems. Nowadays, the students and teachers are the most important figures in educational institutions who should work creatively, learn, improve themselves as well as the teachers must work to develop and improve methods of teaching and education, including interactive ones. The article is devoted to the problem of preparing foreign students of specialized specialties for professionally oriented innovative technologies. Problems related to various methods and techniques of innovative technologies are highlighted. Emphasis is placed on the process of professional foreign language training, which should be aimed at the development of creative personality, its self- -improvement, the formation of socially active and independent people in the context of intercultural dialogue, the disclosure of creative potential. The basic principles of realization of the communicative approach as a communicative method of teaching speech activity in the specialty in foreign language classes (Ukrainian) are formulated. The main features of the presentation as one of the types of information processing of the text as a practical result of research conducted in the framework of interactive forms of learning. The stages of preparation of foreign students to create and conduct a presentation on the specialty in foreign language classes (Ukrainian) are considered. The importance of formation of foreign language communicative competence in the context of professional training of future specialists is proved, attention is focused on one of the main types of information processing of professional text – compression. The list of features of presentation as one of the types of compression of a scientific text is given, the main stages of preparation of foreign students for creating and conducting a presentation in the specialty in foreign language classes (Ukrainian) are analyzed. It is proved that teaching compression is the formation of students’ culture of working with scientific text, improving skills and abilities of understanding, analysis of scientific text and writing a secondary scientific text based on the disclosure of the semantic structure of the original text.

НАВЧАННЯ УЧНІВ 5-ГО КЛАСУ КОМПРЕСІЇ ІНФОРМАЦІЇ ПІД ЧАС АУДІЮВАННЯ НА УРОКАХ УКРАЇНСЬКОЇ МОВИ

Background: Well-developed listening skills of schoolchildren are significant for native language acquisition since these skills contribute to building the ability of perceiving, processing and transforming information in various communicative situations. The successful mastering of processing and transformation of information is a complex process which is affected by several cognitive factors: intelligence, reaction time, memory, attention span, and the ability to switch between different mental operations. One of the ways of transforming information is its compression. Teaching this skill integrated with listening is a challenging task that requires consideration of the age and individual psychological characteristics of schoolchildren, the pace of speech, the volume of the message, intonation features, etc. Purpose: The purpose of the study was to characterize the theoretical and practical aspects of the technique for teaching information compression integrated with listening to 5th-grade secondary school students in a Ukrainian language classroom. Results and Discussion: Compression of information in the process of listening is a mental process of processing a message which leads to the reduction of the speech signal, with the information preserved in the amount that corresponds to the communicative purpose of listening. Several types of compression to be taught in the 5th-grade Ukrainian classroom have been distinguished by the authors. The difficulties faced by students during the compression of information in the process of listening have also been specified. In most cases, they are related to the form of a language unit and communication, the form and volume of the message, dynamic features of the receiving channel, the semantic load of the message, etc. The criteria for selecting material for listening include content, structure and composition, genre, language, accessibility, listening length and time. Building the text compression skills is carried out at the text and post-text stages since compression is integrated with the stages of work on a text.

Study on Electric Compression Type Large Temperature Difference Heating Pump Unit for ‘Zero Carbon’ Heating

Study on Electric Compression Type Large Temperature Difference Heating Pump Unit for ‘Zero Carbon’ Heating

Harvester’s palsy – bilateral common peroneal nerve palsy: A descriptive case report

Peroneal neuropathy is the common mononeuropathy of the lower extremities in adults. The documented etiologies for peroneal nerve injury include trauma, traction, and external compression. Fibular neck is the most common site of common peroneal nerve (CPN) injury as the nerve lies superficial and vulnerable for injury. A 50-year-old male presented with foot drop in his left leg after working in squatting position for prolonged hours along with sensory disturbance in dorsum of left foot. Clinical examination showed poor dorsiflexion in both side ankle with preserved plantar flexion. Electrophysiological findings locate the site of lesion to be CPN at the level of fibular neck. We conclude that CPN is injured due to knee flexion in farmers repeatedly squatting for long hours. Superficial peroneal nerve may be spared due to their interfascicular arrangement at the level of fibular neck placing deep peroneal nerve near the fibula making them more susceptible to compression type of injury. Peroneal nerve may be damaged at multiple sites including ankle. The condition can be reversed with conservative treatment, primarily by avoiding the precipitating position.

Nonoperative Treatment of Select Lateral Compression Type II Pelvic Ring Injuries (OTA/AO 61B2.2) Results in a Low Rate of Radiographic Displacement.

To quantify radiographic outcomes and to identify predictors of late displacement in the nonoperative treatment of lateral compression type II (LC-2) pelvic ring injuries. Retrospective review. Two Level 1 trauma centers. Thirty eight patients 18 years of age or older with LC-2 pelvic ring injuries were included in the study. Nonoperative treatment. Crescent fracture displacement (CFD) was measured on initial axial computed tomography scan. Change in pelvic ring alignment was measured by the deformity index, simple ratio, and inlet and outlet ratios on successive plain radiographs. Patients in this study had minimally displaced LC-2 pelvic ring injuries, with median initial CFD of 2 mm and median initial deformity index of 2%. No patients had a change of more than or equal to 10 percentage points in deformity index over the treatment period, but small amounts of displacement were seen on the other ratios. No patients initially selected for nonoperative treatment converted to operative treatment. No radiographic predictors of late displacement were identified. Bilateral pubic rami fractures and the presence of a complete sacral fracture ipsilateral to the crescent fracture were not associated with late displacement. A spectrum of injury severity and stability exists in the LC-2 pattern. Nonoperative treatment of LC-2 injuries with low initial deformity and CFD results in minimal subsequent displacement. Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.

Indications for Nonsurgical Treatment of Thoracolumbar Spine Fractures: WFNS Spine Committee Recommendations.

Thoracolumbar spine is the most injured spinal region in blunt trauma. Literature on the indications for nonoperative treatment of thoracolumbar fractures is conflicting. The purpose of this systematic review is to clarify the indications for nonsurgical treatment of thoracolumbar fractures. We conducted a systematic literature search between 2010 to 2020 on PubMed/MEDLINE, and Cochrane Central. Up-to-date literature on the indications for nonoperative treatment of thoracolumbar fractures was reviewed to reach an agreement in a consensus meeting of WFNS (World Federation of Neurosurgical Societies) Spine Committee. The statements were voted and reached a positive or negative consensus using the Delphi method. For all of the questions discussed, the literature search yielded 1,264 studies, from which 54 articles were selected for full-text review. Nine studies (4 trials, and 5 retrospective) evaluating 759 participants with thoracolumbar fractures who underwent nonoperative/surgery were included. Although, compression type and stable burst fractures can be managed conservatively, if there is major vertebral body damage, kyphotic angulation, neurological deficit, spinal canal compromise, surgery may be indicated. AO type B, C fractures are preferably treated surgically. Future research is necessary to tackle the relative paucity of evidence pertaining to patients with thoracolumbar fractures.

Design of Piezoelectric Acceleration Sensor for Automobile Applications

In this study, piezoelectric based compressive type accelerometer has been de-signed by using PZT-5A ceramics with bellewasher type spring. FEA analysis were carried out by using COMSOL. According to COMSOL simulation, reso-nance frequency is nearly 42500 Hz. Sensitivity of the designed sensors were measured and compared each other. Frequency spectrum was between 100Hz-10 kHz. The effects of piezodisk thickness, stiffness of the spring and seismic mass on the sensitivity of the designed sensor were investigated. Voltage output is in-creasing from 4.1 mV/g to 12.7 mV/g while seismic mass is raised from 3 gr to 10 gr. Linearity depending on the frequency of the designed accelerometer was dis-torted above 5.5 kHz like commercial accelerometer. In addition, real-time tests were performed using a calibrated accelerometer and a designed accelerometer on the internal combustion engine and drivetrain. Vibration profiles were carried out randomly. According to the results obtained here, it is observed that all the peaks were matched with a coefficient about 1.3.

Image Compression Techniques: Literature Review

With the development of modern communications technology, data compression is becoming more important to save space and reduce transmission costs. Because of this, various types and strategies of image compression were provided by several researchers, some of these studies were discussed in this review. The two main types of image compression are Lossless and lossy compression, with many methods for each of them. This research also described various lossless and lossy compression algorithms that were used by many researchers studied that reported in this literature. Lastly, certain conclusions have been provided based on the results of the conducted survey.

Percutaneous Spine Fusion Combined with Whole-Body Traction in the Acute Surgical Treatment of AO A- and C-Type Fractures: A Technical Note

A diminished level of pain following the operation and shortened hospitalization are the distinct advantages of minimally invasive spine surgery (MISS). However, manipulating the spine with additional MISS tools (e.g., distraction and compression devices) is often cumbersome. Our paper draws attention to a cost-free, fast, indirect decompression method that can be used in the acute treatment of thoracolumbar spine fractures. The presented method involves ligamentotaxis by whole-body traction in the operating room combined with percutaneous spine fixation. Fifteen patients with thoracolumbar injuries A type and C type (without distraction) by AO classification were operated sequentially with the combination of whole-body traction and percutaneous minimally invasive spine fixation. Data were analyzed retrospectively. A total of 139 screws were implanted into 70 segments in 6 female and 9 male patients. The average clinical follow-up was 16 months. Average preoperative traumatic kyphosis was 17 degrees, and an average postoperative kyphosis was 1.8 degrees. The fractured vertebrae's height gain was an average of 11.0 mm (range 3.9-21.9 mm) ventrally and an average of 5.4 mm (range 1-11.2 mm) dorsally after the surgeries. The spinal canal space narrowing showed an average 6.5 mm improvement postoperatively. Operative time averaged 2 hours and 34 minutes, and blood loss averaged 250 mL (range 150-400 mL). No neurologic complications and wound healing problems were observed. The combination of MISS and whole-body traction provided successful anatomical correction in thirteen of the fifteen cases of compression type thoracolumbar fractures without extensive surgical exploration.

Unstable minimally displaced lateral compression type 1 (LC1) pelvic ring injuries have a similar hospital course as intertrochanteric femur fractures

IntroductionThe purpose of this study was to evaluate how the hospital course of minimally displaced LC1 fractures, with and without occult instability, compares with that of intertrochanteric femur fractures. Patients and MethodsRetrospective comparative cohort analysis at an urban level one trauma center of 40 consecutive patients with an isolated LC1 pelvic ring injury and 40 age/sex matched patients with an isolated intertrochanteric femur fracture was performed. Medical records and radiographs were reviewed for patient and injury characteristics, including demographics, displacement, time to surgery, ambulation, physical therapy (PT) clearance, hospital length of stay (LOS), and inpatient morphine milligram equivalents (MME). ResultsThe LC1 pelvic ring injury group included 26 (65%) patients with ≥ 10 mm of displacement on lateral stress radiographs. The unstable LC1 group, compared to the stable LC1 group, had a greater LOS (median difference (MD): 2 days, 95% confidence interval (CI): 1 to 4, p = 0.0004), longer time to ambulate 15 feet (MD: 1 day, CI: 1 to 2, p = 0.0002), longer time to clear PT (MD: 2 days, CI: 1 to 3, p = 0.0003), and more inpatient MMEs (MD: 386 MME, CI: 225.8 to 546.7, p = 0.0002). The unstable LC1 and intertrochanteric fracture groups had no detectable differences in LOS (p = 0.24), days to ambulate 15 feet (p = 0.46), days to clear PT (p = 0.95), and inpatient MMEs (p = 0.06). ConclusionPatients with minimally displaced unstable LC1 injuries had worse hospital courses than stable LC1 injuries and similar hospital courses as intertrochanteric femur fractures. These findings emphasize the associated morbidity of unstable LC1 injuries. Level of evidence: Level III, Retrospective cohort study