2,634 research outputs found
On the relationship between squared pairings and plain pairings
In this paper, we investigate the relationship between the squared Weil/Tate pairing and the plain Weil/Tate pairing. Along these lines, we first show that the squared pairing for arbitrary chosen point can be transformed into a plain pairing for the trace zero point which has a special form to compute them more efficiently. This transformation requires only a cost of some Frobenius actions. Additionally, we show that the squared Weil pairing can be computed more efficiently for trace zero point and derive an explicit formula for the 4th powered Weil pairing as an optimized version of the Weil pairing
Development of a Chaff Dispense Program for Target Tracking Radar Deception
This study aims to develop an appropriate chaff dispensing program to deceive the target tracking radar (TTR) effectively. Chaff is a countermeasure commonly used by fighter aircraft to deceive TTR. However, there has been a lack of methodology for calculating chaff dispense programs that take into account the specific characteristics of the fighter, chaff, and TTR. This study proposes a methodology that considers these variables to calculate chaff dispense programs and addresses this gap. The proposed method is demonstrated through TESS engagement, which shows its effectiveness in various engagement situations
Relationship between the Retinal Thickness Analyzer and the GDx VCC Scanning Laser Polarimeter, Stratus OCT Optical Coherence Tomograph, and Heidelberg Retina Tomograph II Confocal Scanning Laser Ophthalmoscopy
PURPOSE: To assess the relationship between the retinal thickness analyzer (RTA) parameters, and those of the GDx VCC scanning laser polarimeter (GDx VCC), Stratus OCT optical coherence tomography (Stratus OCT), and Heidelberg retinal tomograph II confocal scanning laser ophthalmoscopy (HRT II).
METHODS: Twenty-nine primary open-angle glaucoma patients were retrospectively included in this study. Measurements were obtained using the RTA, GDx VCC, Stratus OCT, and HRT II. We calculated the correlation coefficients between the parameters of RTA and those of the other studies.
RESULTS: Among the optic disc parameters of RTA, the cup volume was best correlated with Stratus OCT (R=0.780, p<0.001) and HRT II (R=0.896, p<0.001). Among the posterior pole retinal thickness parameters, the posterior pole abnormally thin area (PPAT) of the RTA and the inferior average of the GDx VCC were best correlated (R=-0.596, p=0.001). The PPAT of the RTA and the inferior maximum of the Stratus OCT were best correlated (R=-0.489, p=0.006). The perifoveal minimum thickness (PFMT) of the RTA and the cup shape measurement of the HRT II were best correlated (R=-0.565, p=0.004).
CONCLUSIONS: Many RTA optic disc parameters were significantly correlated with those of the Stratus OCT and HRT II. The RTA posterior pole retinal thickness parameters were significantly correlated with those of the GDx VCC, Stratus OCT and HRT II. The RTA optic disc and posterior pole retinal thickness parameters may be valuable in the diagnosis of glaucomaope
A New Forward Secure Signature Scheme
In this paper, we present two forward secure signature schemes
based on gap Diffie-Hellman groups and prove these schemes to be
secure in the sense of slightly stronger security notion than that
by Bellare and Miner in the random oracle model. Both schemes use
the same key update strategy as the encryption scheme presented by
Canetti, Halevi and Katz. Hence, our schemes outperform the
previous tree-based forward secure signature scheme by Bellare and
Miner in the key generation and key update time, which are only
constant in the number of time periods. Specifically, we describe
a straightforward scheme following from the encryption scheme, and
then improve its efficiency for signature verification algorithm
which needs only 3 pairing computations independent of the total
time periods
Development of a standardized in-hospital cardiopulmonary resuscitation set-up
Objective. This study evaluated whether
chest compression in a standardized inhospital
cardiopulmonary resuscitation
(CPR) set-up can be performed as effectively
as when the rescuer is kneeling beside
the patient lying on the floor. Specifically,
the in-hospital test was standardized
according to the rescuers’ average knee
height.
Methods. Experimental intervention (test
1) was a standardized, in-hospital CPR
set-up: first, the bed height was fixed at 70
cm. Second, the height difference between
the bed and a step stool was set to the average
knee height of the CPR team members
(45 cm). Control intervention (test 2) was
kneeling on floor. Thirty-eight medical
doctors on the CPR team each performed
2 minutes of chest compressions in test 1
and 2 in random order (cross-over trial). A
Little Anne was used as a simulated patient
who had experienced cardiac arrest. Chest
compression parameters, such as average
depth and rate, were measured using an accelerometer
device.
Results. In all tests, the average depths were
those recommended in the most recent
CPR guidelines (50–60 mm); there were no
significant differences between Tests 1 and
2 (53.1 ± 4.3 mm vs. 52.6 ± 4.8 mm, respectively;
p = 0.398). The average rate in Test
2 (119.1 ± 12.4 numbers/min) was slightly
faster than that in Test 1 (116.4 ± 10.2 numbers/
min; p = 0.028). No differences were
observed in any other parameters.
Conclusions. Chest compression quality in
our standardized in-hospital CPR set-up
was similar with that performed in a kneeling
position on the floor.
Trial Registration: Clinical Research Information
Service: KCT000159
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