Data center TCP dataset.

In this paper, we would like to introduce a unique dataset that covers thousands of network flow measurements realized through TCP in a data center environment. The TCP protocol is widely used for reliable data transfers and has many different versions. The various versions of TCP are specific in how they deal with link congestion through the congestion control algorithm (CCA). Our dataset represents a unique, comprehensive comparison of the 17 currently used versions of TCP with different CCAs. Each TCP flow was measured precisely 50 times to eliminate the measurement instability. The comparison of the various TCP versions is based on the knowledge of 18 quantitative attributes representing the parameters of a TCP transmission. Our dataset is suitable for testing and comparing different versions of TCP, creating new CCAs based on machine learning models, or creating and testing machine learning models, allowing the identification and optimization of the currently existing versions of TCP.

Predictors of radiographic outcomes of conservative and surgical treatment of Legg-Calvé-Perthes disease.

PURPOSE: Treatment outcomes of conservative and surgical treatment of Legg-Calvé-Perthes disease (LCPD) have been shown to be conditioned by a number of factors that may vary across different populations. This retrospective study aimed to evaluate factors affecting radiographically assessed treatment outcomes in patients treated surgically or conservatively for LCPD at Faculty Hospital Motol, Prague, Czech Republic, between the years 2006 and 2019. METHODS: Data of forty-seven children comprising 52 hips were analysed. Treatment outcomes were evaluated according to Stulberg classification. Predictors included the initial stage of fragmentation of the hip joint according to Herring classification, type of treatment (conservative or surgical), age at the time of diagnosis and sex. RESULTS: Older age and severity of LCPD according to Herring classification but not the type of treatment were the strongest factors determining treatment outcomes. Treatment outcomes were comparable in patients treated conservatively or surgically both across the whole cohort of patients and a group of young children < six years of age. CONCLUSIONS: Results strengthen the roles of severity of the LCPD at onset of treatment and age of the patient in predicting treatment outcomes in patients with LCPD. Conservative and surgical treatments appear to yield similar treatment outcomes irrespective of age of patients.

Femoroacetabular impingement syndrome--efficacy of surgical treatment with regards to age and basic diagnosis.

PURPOSE: The aim of this study was to assess the outcome of hip preserving surgery for femoroacetabular impingement relative to the condition resulting in FAI and to the patient's age at the time of the surgery. METHODS: With the conditions for exclusion duly met, enrolled in our study were a total of 100 hip joints (83 operated on with the aid of SHD, 17 with AMIS). The minimum follow-up period was 12 months, and the mean follow-up time was three years four months. WOMAC and NAHS questionnaires were used as rating instruments. To analyse the significance of the differences relative to the age at the time of surgery and to the basic diagnosis leading to FAI and subsequently to surgical operation we used non-parametric forms of analysis of variance (Friedman test and Kruskal-Wallis test), i.e., comparisons of the patients' pre-operative and postoperative states, estimation of the rate of improvement in the postoperative functional skills in relation to the age at the time of surgery and/or relative to the basic diagnosis necessitating surgical intervention, with respect to statistical significance at the level of p < 0.05. RESULTS: As testing of our cohort of patients and results analysis showed, the youngest group (<30 years) compared with the rest of the cohort shows greater postoperative improvement and consequently also a better surgical result. Proof was also obtained that the diagnosis leading to surgery for FAI has no effect on the patient's pre- or postoperative state or on the degree of improvement. CONCLUSIONS: The results of the study affirm the relevance of hip preserving surgery, especially in younger-aged groups.

[Bernese periacetabular osteotomy (Ganz procedure). First experience]. / Ganzova periacetabulární osteotomie pánve - první zkusenosti.

PURPOSE OF THE STUDY: Developmental dysplasia of the hip (DDH), treated either conservatively or surgically, may result in a dysplastic acetabulum. To treat this after bone maturation is completed, Bernese periacetabular osteotomy, also known as the Ganz procedure, has recently been used as the method of choice at our department. The evaluation of the first results is presented here. MATERIAL AND METHODS: The group evaluated comprised 25 hips (21 female and 4 male) in 22 patients. Nineteen hips were treated for residual dysplasia of the acetabulum due to DDH, and six for a spastic hip. The average age was 26 years (range, 12 to 44) and 14 right and 11 left hips were involved On pre- and post-operative radiographs the AC index, Wiberg lateral CE angle, Wagner index, improvement in Shenton's line, and lateralisation and anteversion of the acetabulum were compared. Bernese periacetabular osteotomy is an extensive surgical procedure requiring special instrumentation. It may be associated with serious complications and has a relatively long learning curve. RESULTS: The average follow-up was 18 months (range, 2 to 36). The average duration of surgery was 2 hours and 44 min (range, 2 to 31/ 2 h). The average values improved in the AC index by 24 degrees, lateral CE angle by 29 degrees and Wagner index by 18 %. Shenton's line was corrected by surgery in 20 hips and lateral migration in 16 hips. In two hips lateralisation did not changed. Two serious complications were recorded: para-articular ossification requiring excision and concomitant acetabular trimming, and great intra-operative blood loss. DISCUSSION: Various mechanisms of damage to the hip are discussed and the methods of treatment outlined, together with prerequisites for successful surgery. Potential complications and their treatment are mentioned. CONCLUSIONS: Bernese periacetabular osteotomy makes the range of roofing procedures for hip joint treatment wider. These, as well as hip joint reduction techniques, should be performed in major specialized centres.

Arthroscopic evaluation of ultrasonography and magnetic resonance imaging for diagnosis of rotator cuff tear.

BACKGROUND: Rotator cuff tear--diagnosis; comparison of MRI, ultrasonographic and arthroscopic findings. MATERIALS AND METHODS: Retrospective study--20 patients treated for shoulder pain due to rotator cuff tear, initially conservatively and after more than 6 months by arthroscopic shoulder surgery. Comparison of intraoperative findings with preoperative US and MRI images. RESULTS: Sensitivity of USG--1.0, specificity 0.9. Sensitivity of MRI--0.92, specificity 1.0. DISCUSSION: Clinical examination and physical tests are not fully reliable diagnostic tools in patients with shoulder pain, because symptoms of different conditions overlap. Using ultrasound to visualize the shoulder area has some advantages to other imaging techniques such as CT scan or MRI, and has a very good sensitivity and good specificity. Many authors agree that MRI is one of the most effective methods for the diagnosis of rotator cuff tear. CONCLUSIONS: Ultrasound and magnetic resonance imaging are both very sensitive techniques for diagnosis of rotator cuff abnormalities. Ultrasonography can be used as a primary method owing to its fast procedure and affordable cost.

Gas chromatography method for the characterization of ethanol steam reforming products.

Ethanol steam reforming is a promising reaction for producing fuel cell hydrogen. Depending on catalyst and reaction conditions, mixtures of condensable hydrocarbons and organic and inorganic gases are produced. This paper proposes an economic and effective solution for separating and detecting these compounds employing a gas chromatograph equipped with two columns, two 6-way valves, and two detectors.