60 research outputs found
3D spacecraft configuration using immersive AR technology
In this paper we propose an integrated immersive augmented reality solution for a software tool supporting spacecraft design and verification. The spacecraft design process relies on expertise in many domains, such as thermal and structural engineering. The various subsystems of a spacecraft are highly interdependent and have differing requirements and constraints. In this context, interactive visualizations play an important role in making expert knowledge accessible. Recent immersive display technologies offer new ways of presenting and interacting with computer-generated content. Possibilities and challenges for spacecraft configuration employing these technologies are explored and discussed. A user interface design for an application using the Microsoft HoloLens is proposed. To this end, techniques for selecting a spacecraft component and manipulating its position and orientation in 3D space are developed and evaluated. Thus, advantages and limitations of this approach to spacecraft configuration are revealed and discussed
Neural Semantic Parsing for Syntax-Aware Code Generation
The task of mapping natural language expressions to logical forms is referred to as semantic parsing. The syntax of logical forms that are based on programming or query languages, such as Python or SQL, is defined by a formal grammar. In this thesis, we present an efficient neural semantic parser that exploits the underlying grammar of logical forms to enforce well-formed expressions. We use an encoder-decoder model for sequence prediction. Syntactically valid programs are guaranteed by means of a bottom-up shift-reduce parser, that keeps track of the set of viable tokens at each decoding step. We show that the proposed model outperforms the standard encoder-decoder model across datasets and is competitive with comparable grammar-guided semantic parsing approaches
Electrocardiographic diagnosis of acute coronary syndromes in patients with left bundle branch block or paced rhythm
The population of patients with a pacemaker is constantly growing in number. Myocardial
infarction in these patients, like in patients with left bundle branch block (LBBB), is called the
undetermined type and characterizes the highest risk of death. Therefore the early and correct
diagnosis of AMI is very important. The electrocardiographic criteria of the recognition of
acute myocardial infarction (AMI) in patients with a ventricular pacing are similar to the
electrocardiographic criteria of the recognition of AMI in patients with LBBB. They are
applicable in the first phase of AMI’s diagnostic process and they are known as Sgarbossa’s
criteria. However, one should remember about differences between these two groups of patients
and therefore particular criteria have got different significance in patients from each group.
There are three Sgarbossa’s criteria: ST-segment elevation of ≥ 5 mm in the presence of
a negative QRS complex, ST-segment elevation of ≥ 1 mm in the presence of a positive QRS
complex and ST-segment depression of ≥ 1 mm in lead V1, V2 or V3. In spite of all limitations
of use ECG records in the recognition of AMI in patients with a ventricular pacing it should be
remembered, that this method (together with a typical medical history) is still the simplest, the
cheapest and the most available means of an early diagnosis of AMI. In patients with chest
pain, the presence of a pacemaker should not defer the execution of ECG recording because
ECG may be very helpful in establishing of the diagnosis. (Cardiol J 2007; 14: 207-213
Harmonised Portrayal of e-Navigation-related Information
A Guideline on the Harmonised Portrayal of e-Navigation-related Information was recently completed by IALA. The purpose of this Guideline is to provide guidance regarding the presentation and display of e-Navigation-related information. The basic, over-riding premise of this Guideline is that shipborne and shore-based equipment, systems, and services should portray e-Navigation-related information to all users (both onboard and ashore) in a consistent manner. However, since e-Navigation is an evolutionary process, this goal-based guideline describes over-arching objectives to be achieved, while freedom to innovate is left to both developers and users. An explanation is provided about key aspects of the Guideline. In particular, a website has been established to show examples of useful ways to portray e-Navigation information for current as well as some future types of equipment, systems, and services
Foreign body in vagina – polyurethane foam. Case report
Abstract This report presents the case of a 40-year-old woman hospitalized in the Department of Gynecology and Oncological Gynecology, Military Institute of the Health Services, who was found to have had a foreign body (polyurethane foam) of significant amount for three days in her vagina. The foreign body was successfully removed during surgery and did not lead to any negative health consequences for the patient
Biedronki (Coleoptera: Coccinellidae) odłowione przy użyciu samołówek świetlnych w trzech kompleksach leśnych we wschodniej i centralnej Polsce
Chrząszcze z rodziny biedronkowatych (Coccinellidae), jako ważny czynnik ograniczający liczebność stawonogów powodujących szkody w uprawach, są częstym obiektem badań entomologicznych. Do odłowów stosuje się różne metody, przy czym do rzadziej wykorzystywanych należy metoda przywabiania chrząszczy do światła. W niniejszych badaniach zastosowaliśmy tę metodę do odłowu biedronek w rezerwacie Jata k. Łukowa oraz w dwóch kompleksach leśnych położonych w granicach administracyjnych Warszawy: w rezerwacie Las Bielański i w Lesie Młocińskim. Nocne odłowy owadów do samołówek świetlnych prowadzono w latach 2018 i 2019 między marcem a listopadem, jednak biedronki wpadały do pułapek w okresie od kwietnia do września. Łącznie na trzech stanowiskach odłowiono 347 osobników Coccinellidae należących do 16 gatunków. Największe bogactwo gatunkowe (15 gatunków), a jednocześnie najmniejszą średnią liczebność biedronek (1,3 osobnika na próbę) odnotowano w Jacie. W Lesie Bielańskim stwierdzono 9 gatunków i średnio 4 osobniki na próbę, a w Lesie Młocińskim 4 gatunki i średnio 2,2 osobnika na próbę. Na wszystkich trzech stanowiskach gatunkiem dominującym była Calvia decemguttata (L.). Wysoki udział miały również Harmonia axyridis (Pallas) i Vibidia duodecimguttata (Poda). Większość odłowionych osobników biedronek (71%) należała do gatunków pozbawionych ubarwienia ostrzegawczego, co może pośrednio świadczyć o ich nocnym trybie życia
Nieokreślony typ ostrego zespołu wieńcowego - rola elektrokardiogramu
Pacjenci ze stymulatorem serca stanowią coraz liczniejszą grupę. Zawał serca u tych osób,
podobnie jak u chorych z blokiem lewej odnogi pęczka Hisa (LBBB), należy do typu nieokreślonego
ostrego zespołu wieńcowego i wiąże się z największym ryzykiem nagłego zgonu, dlatego
tak ważne jest odpowiednio wczesne i prawidłowe jego rozpoznanie. Elektrokardiograficzne
kryteria rozpoznania ostrego zawału serca u pacjentów ze stymulacją komorową są w dużej
mierze zbieżne z kryteriami rozpoznania zawału u pacjentów z LBBB. Znajdują one zastosowanie
w pierwszym etapie procesu diagnostycznego ostrego zawału serca i znane są jako "kryteria Sgarbossy". Do "kryteriów Sgarbossy" należą: uniesienie odcinka ST większe lub
równe 5 mm przy ujemnym wychyleniu zespołów QRS, uniesienie odcinka ST większe lub
równe 1 mm przy dodatnim wychyleniu zespołów QRS oraz obniżenie odcinka ST większe lub
równe 1 mm w odprowadzeniach V1, V2 lub V3. Należy jednak pamiętać o specyficznych
różnicach miêdzy pacjentami ze stymulacją komorową a osobami z LBBB, które wskazują na
odmienne znaczenie poszczególnych kryteriów w obu grupach. Pomimo licznych ograniczeń
metody elektrokardiograficznej w rozpoznawaniu ostrego zawału serca u chorych ze stymulacją komorową należy pamiętać, że metoda ta nadal, wraz z typowym wywiadem, jest najprostszą, najtańszą i najbardziej dostępną formą wstępnej diagnostyki ostrego zawału serca.
(Folia Cardiologica Excerpta 2007; 2: 175-182
Risk factors of atrial fibrillation recurrence despite successful radiofrequency ablation of accessory pathway: At 11 years of follow-up
Background: Previous reports on patients with radiofrequency catheter ablation (RFCA) of accessorypathway (AP) and atrial fibrillation (AF) include only short follow-up periods. The aim of this studywas to analyze predictors of recurrence of AF in patients after successful RFCA of APs over long termfollow-up periods.Methods: Of the 1,007 patients who underwent non-pharmacological treatment of APs (between theyears 1993–2008), data of 100 consecutive patients were retrospectively analyzed (75 men, mean age43.6 ± 14.7), with the longest period of follow-up (mean 11.3 ± 3.5 years) after successful RFCA ofAP. In Group 1, there were 72 patients (54 men, mean age 40.66 ± 13.85 years) without documentedepisodes of AF after RFCA of AP. Group 2 consisted of 28 patients (21 men, mean age 50.79 ± 14.49years) with AF episodes despite successful elimination of AP.Results: In univariate analysis, patients from Group 1 were significantly younger at the time of ablationthan patients from Group 2 (40.66 ± 13.85 vs. 50.79 ± 14.49 years; p = 0.002), had shorter historyof AF episodes (4.11 ± 4.07 vs. 8.25 ± 7.50 years; p = 0.024) and had less frequently documentedatrial tachycardia (AT) prior to ablation (3.39 vs. 20.00%; p = 0.022). In multivariate analysis, thehistory of AF in years (p = 0.043), was an independent risk factor for AF recurrences.Conclusions: Older patient age, longer history of AF and AT prior to RFCA of APs identified a subgroupof patients who required additional treatment. In the multivariate analysis, the history of AF inyears (p = 0.043) was a risk factor for AF recurrence
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