76 research outputs found
Can we avoid high coupling?
It is considered good software design practice to organize source code into modules and to favour within-module connections (cohesion) over between-module connections (coupling), leading to the oft-repeated maxim "low coupling/high cohesion". Prior research into network theory and its application to software systems has found evidence that many important properties in real software systems exhibit approximately scale-free structure, including coupling; researchers have claimed that such scale-free structures are ubiquitous. This implies that high coupling must be unavoidable, statistically speaking, apparently contradicting standard ideas about software structure. We present a model that leads to the simple predictions that approximately scale-free structures ought to arise both for between-module connectivity and overall connectivity, and not as the result of poor design or optimization shortcuts. These predictions are borne out by our large-scale empirical study. Hence we conclude that high coupling is not avoidable--and that this is in fact quite reasonable
MASTER: The Mobile Astronomical System of Telescope-Robots
We present the first russian robot-telescope designed to make prompt
observations of gamma-ray bursts (http://observ.pereplet.ru). The telescopes
are near Moscow. The system of telescopes with prompt pointing rates connects
to the internet. The main parameters are the following: Richter-Slefogt system
telescope (355 mm, f/d=2.4); Richter-Slefogt system telescope (200mm, f/d=2.4);
Flugge system telescope (280mm, f/d=2.5); TV-camera with 20x40 degree
objective; Two CCD cameras (Pictor 416); One CCD Apogee Camera AP16E. The type
of mount is German with 8 grad/sec slew rate. MASTER images stars down to 19
magnitude in a 1 min exposure covering 6 square degrees.Comment: 3 pages, 2 figure
Risk assessment of men, underwented myocardial infarction in young age
A retrospective analysis of 96 patientβs cards with myocardial infarction in age younger then 40 years showed, that in this sampling such risk factors as smoking, overweight, arterial hypertension and dyslipidemia are of maximum value.Π Π΅ΡΡΠΎΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· 96 ΠΈΡΡΠΎΡΠΈΠΉ Π±ΠΎΠ»Π΅Π·Π½ΠΈ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ², ΠΏΠ΅ΡΠ΅Π½Π΅ΡΡΠΈΡ
ΠΈΠ½ΡΠ°ΡΠΊΡ ΠΌΠΈΠΎΠΊΠ°ΡΠ΄Π° Π² Π²ΠΎΠ·ΡΠ°ΡΡΠ΅ Π΄ΠΎ 40 Π»Π΅Ρ, ΠΏΠΎΠΊΠ°Π·Π°Π», ΡΡΠΎ Π² ΡΡΠΎΠΉ Π²ΠΎΠ·ΡΠ°ΡΡΠ½ΠΎΠΉ Π³ΡΡΠΏΠΏΠ΅ Π½Π°ΠΈΠ±ΠΎΠ»ΡΡΠ΅Π΅ Π·Π½Π°ΡΠ΅Π½ΠΈΠ΅ Π² ΡΠ°Π·Π²ΠΈΡΠΈΠΈ Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΡ ΠΈΠΌΠ΅ΡΡ ΡΠ°ΠΊΠΈΠ΅ ΡΠ°ΠΊΡΠΎΡΡ ΡΠΈΡΠΊΠ°, ΠΊΠ°ΠΊ ΠΊΡΡΠ΅Π½ΠΈΠ΅, ΠΈΠ·Π±ΡΡΠΎΡΠ½Π°Ρ ΠΌΠ°ΡΡΠ° ΡΠ΅Π»Π°, Π°ΡΡΠ΅ΡΠΈΠ°Π»ΡΠ½Π°Ρ Π³ΠΈΠΏΠ΅ΡΡΠΎΠ½ΠΈΡ ΠΈ Π΄ΠΈΡΠ»ΠΈΠΏΠΈΠ΄Π΅ΠΌΠΈΡ
Sindarin: A Versatile Scripting API for the Pharo Debugger
International audienceDebugging is one of the most important and time consuming activities in software maintenance, yet mainstream debuggers are not well-adapted to several debugging scenarios. This has led to the research of new techniques covering specific families of complex bugs. Notably, recent research proposes to empower developers with scripting DSLs, plugin-based and moldable debuggers. However, these solutions are tailored to specific use-cases, or too costly for one-time-use scenarios. In this paper we argue that exposing a debugging scripting interface in mainstream debuggers helps in solving many challenging debugging scenarios. For this purpose, we present Sindarin, a scripting API that eases the expression and automation of different strategies developers pursue during their debugging sessions. Sindarin provides a GDB-like API, augmented with AST-bytecode-source code mappings and object-centric capabilities. To demonstrate the versatility of Sindarin, we reproduce several advanced breakpoints and non-trivial debugging mechanisms from the literature
Restructuring of colloidal aggregates in shear flow: Coupling interparticle contact models with Stokesian dynamics
A method to couple interparticle contact models with Stokesian dynamics (SD)
is introduced to simulate colloidal aggregates under flow conditions. The
contact model mimics both the elastic and plastic behavior of the cohesive
connections between particles within clusters. Owing to this, clusters can
maintain their structures under low stress while restructuring or even breakage
may occur under sufficiently high stress conditions. SD is an efficient method
to deal with the long-ranged and many-body nature of hydrodynamic interactions
for low Reynolds number flows. By using such a coupled model, the restructuring
of colloidal aggregates under stepwise increasing shear flows was studied.
Irreversible compaction occurs due to the increase of hydrodynamic stress on
clusters. Results show that the greater part of the fractal clusters are
compacted to rod-shaped packed structures, while the others show isotropic
compaction.Comment: A simulation movie be found at
http://www-levich.engr.ccny.cuny.edu/~seto/sites/colloidal_aggregates_shearflow.htm
A flare in the optical spotted in the changing-look Seyfert NGC 3516
We present observations from the short-term intensive optical campaign (from
Sep2019 to Jan2020) of the changing-look Seyfert NGC 3516. This active galactic
nucleus is known to have strong optical variability and has changed its type in
the past. It has been in the low-activity state in the optical since 2013, with
some rebrightening from the end of 2015 to the beginning of 2016, after which
it remained dormant. We aim to study the photometric and spectral variability
of NGC 3516 from the new observations in U- and B-bands and examine the
profiles of the optical broad emission lines in order to demonstrate that this
object may be entering a new state of activity. NGC 3516 has been monitored
intensively for the past 4 months with an automated telescope in U and B
filters, enabling accurate photometry of 0.01 precision. Spectral observations
were triggered when an increase in brightness was spotted. We support our
analysis of past-episodes of violent variability with the UV and X-ray
long-term light curves constructed from the archival Swift data. An increase of
the photometric magnitude is seen in both U and B filters to a maximum
amplitude of 0.25mag and 0.1 mag, respectively. During the flare, we observe
stronger forbidden high-ionization iron lines than reported before, as well as
the complex broad Ha and Hb lines. This is especially seen in Ha which appears
to be double-peaked. It seems that a very broad component of ~10,000 km/s in
width in the Balmer lines is appearing. The trends in the optical, UV, and
X-ray light curves are similar, with the amplitudes of variability being
significantly larger in the case of UV and X-ray bands. The increase of the
continuum emission, the variability of the coronal lines, and the very broad
component in the Balmer lines may indicate that the AGN of NGC 3516 is finally
leaving the low-activity state in which it has been for the last ~3 years.Comment: 7 pages, 6 figures, accepted in A&A (corrected after receiving
comments from the language editor
Efficacy of a Relaxation Scenario in Virtual Reality for the Comorbid Symptoms of Anxiety and Asthenia in a General Hospital Setting: A Pilot Comparative Randomized Open-Label Study
BACKGROUND: Patients in general hospitals often display concomitant signs of mental maladjustment: low mood, anxiety, apathy, asthenia, all of which can have a negative impact on the course of the underlying disease and the recovery process. One of the non-pharmacological approaches that has gained wider acceptance in medical practice in recent years is the use of procedures based on virtual reality.
AIM: Assess the efficacy of the new domestic, virtual reality application Flow as relates to symptoms of anxiety and asthenia in patients undergoing inpatient treatment.
METHODS: The study was open-label and had a comparison group; the patients were assigned to the experimental or control group using a randomization table. The patients were assessed using the Spielberger State Anxiety Inventory; the Fatigue Symptom Rating Scale; the Well-being, Activity, Mood questionnaire; the Depression Anxiety Stress Scale; and the Clinical Global Impression Scale. Physical parameters were measured before and after each virtual reality session. The obtained data were statistically processed.
RESULTS: The study involved 60 patients. In 40 patients, the treatment program included a course of five daily relaxation sessions in virtual reality; the control group consisted of 20 patients, who were treated in accordance with the usual practice of the institution. The addition of virtual reality sessions to the standard treatment course yielded significant advantage in terms of affective symptoms reduction in patients both after a single session and as a result of undergoing the full course, and several days after its completion. The patients in the experimental group also showed a significant decrease in blood pressure after the sessions, and this was most pronounced in individuals who initially had elevated and high blood pressure.
CONCLUSION: The use of relaxation program courses in the virtual reality application Flow is an effective and promising means of non-pharmacological care for non-psychiatric inpatients showing symptoms of anxiety, apathy, depressive mood, as well as hypertension
Assesment of the studentβs knowledge on medical and organizational aspects of HIV prevention
The article is devoted to a comparative analysis of data of sociological study to assess the level of awareness and special knowledge of medical University students on the main medical and organizational issues of HIV prevention. A questionnaire survey of 1-6 courses students, 752 respondents was conducted. Respondents demonstrated high level of awareness of the main routes of HIV transmission, which indicates the effectiveness of regional information campaigns. At the same time, there is insufficient knowledge of modern legal issues and clinical and diagnostic characteristics of HIV infection. The rates of correct answers are significantly higher for senior students. It is necessary to update educational modules in clinical and medical-preventive disciplines in order to achieve higher level of knowledge of future doctors on modern requirements for preventing the spread of HIV infectionΠ‘ΡΠ°ΡΡΡ ΠΏΠΎΡΠ²ΡΡΠ΅Π½Π° ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎΠΌΡ Π°Π½Π°Π»ΠΈΠ·Ρ Π΄Π°Π½Π½ΡΡ
ΡΠΎΡΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎ ΠΎΡΠ΅Π½ΠΊΠ΅ ΡΡΠΎΠ²Π½Ρ ΠΈΠ½ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΠΎΡΡΠΈ ΠΈ ΡΠΏΠ΅ΡΠΈΠ°Π»ΡΠ½ΡΡ
Π·Π½Π°Π½ΠΈΠΉ ΠΏΠΎ ΠΎΡΠ½ΠΎΠ²Π½ΡΠΌ ΠΌΠ΅Π΄ΠΈΠΊΠΎ-ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΎΠ½Π½ΡΠΌ Π²ΠΎΠΏΡΠΎΡΠ°ΠΌ ΠΏΡΠΎΡΠΈΠ»Π°ΠΊΡΠΈΠΊΠΈ ΠΠΠ§-ΠΈΠ½ΡΠ΅ΠΊΡΠΈΠΈ Ρ ΡΡΡΠ΄Π΅Π½ΡΠΎΠ² ΠΌΠ΅Π΄ΠΈΡΠΈΠ½ΡΠΊΠΎΠ³ΠΎ ΡΠ½ΠΈΠ²Π΅ΡΡΠΈΡΠ΅ΡΠ°. ΠΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎ Π°Π½ΠΊΠ΅ΡΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΡΡΡΠ΄Π΅Π½ΡΠΎΠ² 1-6 ΠΊΡΡΡΠΎΠ², Π²ΡΠ΅Π³ΠΎ ΠΎΠΏΡΠΎΡΠ΅Π½ΠΎ 752 ΡΠ΅Π». Π Π΅ΡΠΏΠΎΠ½Π΄Π΅Π½ΡΡ Π΄Π΅ΠΌΠΎΠ½ΡΡΡΠΈΡΡΡΡ Π²ΡΡΠΎΠΊΠΈΠΉ ΡΡΠΎΠ²Π΅Π½Ρ ΠΈΠ½ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΠΎΡΡΠΈ ΠΎΠ± ΠΎΡΠ½ΠΎΠ²Π½ΡΡ
ΠΏΡΡΡΡ
ΠΏΠ΅ΡΠ΅Π΄Π°ΡΠΈ ΠΠΠ§-ΠΈΠ½ΡΠ΅ΠΊΡΠΈΠΈ, ΡΡΠΎ ΡΠΊΠ°Π·ΡΠ²Π°Π΅Ρ Π½Π° ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΈΠ²Π½ΠΎΡΡΡ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠΌΡΡ
Π² ΡΠ΅Π³ΠΈΠΎΠ½Π΅ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΎΠ½Π½ΡΡ
ΠΊΠ°ΠΌΠΏΠ°Π½ΠΈΠΉ. ΠΠ°ΡΡΠ΄Ρ Ρ ΡΡΠΈΠΌ, ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΎΡΠ½ΡΠΉ ΡΡΠΎΠ²Π΅Π½Ρ ΡΠΏΠ΅ΡΠΈΠ°Π»ΡΠ½ΡΡ
Π·Π½Π°Π½ΠΈΠΉ ΠΏΠΎ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΠΌ ΠΏΡΠ°Π²ΠΎΠ²ΡΠΌ Π²ΠΎΠΏΡΠΎΡΠ°ΠΌ ΠΏΡΠΎΡΠΈΠ»Π°ΠΊΡΠΈΠΊΠΈ ΠΈ ΠΊΠ»ΠΈΠ½ΠΈΠΊΠΎ-Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΡΠ΅ΡΠΊΠΈΠΌ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠ°ΠΌ ΠΠΠ§-ΠΈΠ½ΡΠ΅ΠΊΡΠΈΠΈ. ΠΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΠΈ ΠΏΡΠ°Π²ΠΈΠ»ΡΠ½ΡΡ
ΠΎΡΠ²Π΅ΡΠΎΠ² Π΄ΠΎΡΡΠΎΠ²Π΅ΡΠ½ΠΎ Π²ΡΡΠ΅ Ρ ΡΡΡΠ΄Π΅Π½ΡΠΎΠ² ΡΡΠ°ΡΡΠΈΡ
ΠΊΡΡΡΠΎΠ². ΠΠ΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎ Π°ΠΊΡΡΠ°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°ΡΡ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°ΡΠ΅Π»ΡΠ½ΡΠ΅ ΠΌΠΎΠ΄ΡΠ»ΠΈ Π² ΠΏΡΠ΅ΠΏΠΎΠ΄Π°Π²Π°Π½ΠΈΠΈ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈ ΠΌΠ΅Π΄ΠΈΠΊΠΎ-ΠΏΡΠΎΡΠΈΠ»Π°ΠΊΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π΄ΠΈΡΡΠΈΠΏΠ»ΠΈΠ½ Π΄Π»Ρ Π΄ΠΎΡΡΠΈΠΆΠ΅Π½ΠΈΡ Π±ΠΎΠ»Π΅Π΅ Π²ΡΡΠΎΠΊΠΎΠ³ΠΎ ΡΡΠΎΠ²Π½Ρ Π·Π½Π°Π½ΠΈΠΉ Π±ΡΠ΄ΡΡΠΈΡ
Π²ΡΠ°ΡΠ΅ΠΉ ΠΏΠΎ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΠΌ ΡΡΠ΅Π±ΠΎΠ²Π°Π½ΠΈΡΠΌ ΠΏΡΠΎΡΠΈΠ»Π°ΠΊΡΠΈΠΊΠΈ ΠΈ ΠΏΡΠΎΡΠΈΠ²ΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡ ΡΠ°ΡΠΏΡΠΎΡΡΡΠ°Π½Π΅Π½ΠΈΡ ΠΠΠ§-ΠΈΠ½ΡΠ΅ΠΊΡΠΈ
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