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Radu Alexandru Ionut,Toganel George Radu,Trusca Daniel Dragos 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.5
The aim of this paper was to develop a mathematical model for the study of the kinematic parameters of an occupant and vehicle during a side impact crash. The proposed model has three bodies (the vehicle, the occupant torso and head) that are interconnected to each other by joints, springs and dampers. Also, the head-to-window contact force is taken into account in order to obtain accurate results for the occupant kinematic injury assessment. The model was designed using a CADCAE software, with a flexibility determined by a total of 63 input parameters and 10 selected output parameters. The model has shown positive results with a high degree of similarity to a crash test, overlapping with a margin of error within under 5 % for an impact simulation time of 300 ms. After validation, a number of parameters could be obtained from the model such as the linear and angular displacement of the torso, head and vehicle that can be used to study the side collision kinematics and dynamics. During the simulation, a displacement of 2 m for the vehicle was registered while a force of 3500 N was reached for the head-to-window contact, for a vehicle-to-vehicle initial collision velocity of 11.6 m/s.
Pseudoaneurysm of the splenic artery
Radu Dumitru,Ana Carbunaru,Mugur Grasu,Mihai Toma,Mihnea Ionescu,Traian Dumitrascu 한국간담췌외과학회 2016 Annals of hepato-biliary-pancreatic surgery Vol.20 No.4
Delayed post-pancreatectomy hemorrhage (PPH) is a relatively uncommon, but feared, complication after pancreaticoduodenectomy (PD). A splenic artery pseudoaneurysm is a rare cause of delayed PPH after a PD. This paper describes the case of a patient with PD used to treat a distal bile duct cholangiocarcinoma complicated with a clinically significant pancreatic fistula and secondary intraabdominal abscess. Computed tomography-guided drainage of the abscess was performed with an apparently favourable outcome; the patient was discharged on postoperative day (POD) 35 and the abdominal drains were removed on POD 50. On POD 80, the patient was readmitted for a severe digestive hemorrhage. Computed tomography revealed a pseudoaneurysm of the splenic artery with a subsequent hematoma formation. Immediately, an angiography was performed and coils were successfully mounted. This case illustrates the rare possibility of the development of a splenic artery pseudoaneurysm with severe delayed PPH after PD complicated with a clinically significant pancreatic fistula, even after the patient was discharged from the hospital. An interventional radiology approach represents the first treatment option in hemodynamically stable patients with high success rates.
DUALITY FOR LINEAR CHANCE-CONSTRAINED OPTIMIZATION PROBLEMS
Radu Ioan Bo\c t,Nicole Lorenz,Gert Wanka 대한수학회 2010 대한수학회지 Vol.47 No.1
In this paper we deal with linear chance-constrained optimization problems, a class of problems which naturally arise in practical applications in finance, engineering, transportation and scheduling, where decisions are made in presence of uncertainty. After giving the deterministic equivalent formulation of a linear chance-constrained optimization problem we construct a conjugate dual problem to it. Then we provide for this primal-dual pair weak sufficient conditions which ensure strong duality. In this way we generalize some results recently given in the literature. We also apply the general duality scheme to a portfolio optimization problem, a fact that allows us to derive necessary and sufficient optimality conditions for it.
Radue, Melanie World Association for Triple Helix and Future Stra 2019 Journal of Contemporary Eastern Asia Vol.18 No.2
When comparing media freedom in Malaysia, Myanmar, and Thailand, so-called "fake news" appears as threats to a deliberative (online) public sphere in these three diverse contexts. However, "racist propaganda", "information operations" and "negative campaigning" might be more accurate terms that explain these forms of systematic manipulative political communication. The three cases show forms of disinformation in under-researched contexts and thereby expand the often Western focused discourses on hate speech and fake news. Additionally, the analysis shows that harmful disinformation disseminated online originates from differing contextual trajectories and is not an "online phenomenon". Drawing on an analysis of connotative context factors, this explorative comparative study enables an understanding of different forms of harmful disinformation in Malaysia, Myanmar, and Thailand. The connotative context factors were inductively inferred from 32 expert interviews providing explanations for the formation of political communication (control) mechanisms.
Development of a Multibody Model Used to Study the Impact Between a Vehicle Wheel with a Pothole
Radu Alexandru Ionut,Tolea Adrian Bogdan,Trusca Daniel Dragos,Ispas Nicolae,Nastasoiu Mircea 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.5
The aim of the work was to develop a multi-body model that can simulate the impact between the vehicle wheel and a pothole. The model consists of the vehicle wheel together with front McPherson suspension assembly and a potholed road surface. Therefore the kinematics of the suspension when the vehicle hits a pothole can be simulated. The model was first predetermined by an analytical calculation and then successfully validated by an experimental test performed with the same parameters as the virtual model. The results were very similar and therefore allow the model to be used to simulate different scenarios in terms of wheel dynamics and behavior when impacting potholes with different depths.
( Radu Badea ),( Lidia Ciobanu ),( Emil Bo?an ),( Cristina Pojoga ),( Marcel Tan?au ) The Editorial Office of Gut and Liver 2014 Gut and Liver Vol.8 No.6
The hamartomatous polyps in Peutz-Jeghers syndrome may have malignant potential. To differentiate between hamartomatous and adenomas polyps, vascular characterization can be assessed using noninvasive procedures, such as contrastenhanced ultrasound (CEUS). The neo-angiogenic characteristics of colorectal adenomas and carcinomas are expressed as an anarchic vascular pattern observed on CEUS. Using CEUS in a patient with Peutz-Jeghers syndrome, we describe for the first time the vascularization of a hamartomatous colonic polyp that exhibits a hierarchy branching pattern. (Gut Liver 2014;8:680-682)
Radu A Farcas,Malaz Almasri,Simona Grad,Stefan-Lucian Popa,Daniel C Leucuta,Abdulrahman Ismaiel,Dan L Dumitrascu 대한소화기 기능성질환∙운동학회 2024 Journal of Neurogastroenterology and Motility (JNM Vol.30 No.3
Background/AimsDisruptions in tight junction (TJ) protein expression leading to duodenal epithelial barrier impairment may contribute to increased intestinal permeability, potentially playing a role in functional dyspepsia (FD) pathophysiology. Currently published studies evaluated the role of several TJ proteins in FD patients with inconsistent results. Therefore, we conducted this systematic review and metaanalysis to evaluate the duodenal mucosal expression of several TJ proteins in FD. MethodsWe performed a systematic electronic search on PubMed, EMBASE, and Scopus using predefined keywords. Diagnosis of FD by Rome III or Rome IV criteria was considered acceptable. Full articles satisfying our inclusion and exclusion criteria were included. The principal summary outcome was the mean difference of several TJ proteins in FD patients and control subjects. ResultsA total of 8 and 5 studies were included in our qualitative and quantitative synthesis, respectively, with a total population of 666 participants, out of which 420 were FD patients. No significant differences were observed between FD patients and controls in the expression of claudin-1 (–0.102 [95% CI, –0.303, 0.099]), claudin-2 (0.161 [95% CI, –0.134, 0.456)], claudin-3 (0.278 [95% CI, –0.280, 0.837]), claudin-4 (0.045 [95% CI, –0.264, 0.354]), ZO-1 (–0.221 [95% CI, –0.683, 0.241]), ZO-2 (–0.070 [95% CI, –0.147, 0.007]), ZO-3 (–0.129 [95% CI, –0.376, 0.118]), β-catenin (–0.135 [95% CI, –0.484, 0.214]), E-cadherin (–0.083 [95% CI, –0.229, 0.063]), and occludin (–0.158 [95% CI, –0.409, 0.093]). ConclusionsThe expressions of all evaluated proteins including claudin-1, claudin-2, claudin-3, claudin-4, ZO-1, ZO-2, ZO-3, β-catenin, E-cadherin, and occludin did not significantly differ between FD patients and controls. However, due to the limited number of included studies, results should be interpreted with caution.
Radu, Ionela,Schleeger, Michael,Bolwien, Carsten,Heberle, Joachim Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.11
The introduction of time-resolved Fourier transform infrared (FT-IR) spectroscopy to biochemistry opened the possibility of monitoring the catalytic mechanism of proteins along their reaction pathways. The infrared approach is very fruitful, particularly in the application to membrane proteins where NMR and X-ray crystallography are challenged by the size and protein hydrophobicity, as well as by their limited time-resolution. Here, we summarize the principles and experimental realizations of time-resolved FT-IR spectroscopy developed in our group and compare with aspects emerging from other laboratories. Examples of applications to retinal proteins and energy transduction complexes are reviewed, which emphasize the impact of time-resolved FT-IR spectroscopy on the understanding of protein reactions on the level of single bonds.
Radu Alexandru Ionut,Cofaru Corneliu,Tolea Bogdan 한국자동차공학회 2017 International journal of automotive technology Vol.18 No.6
The aim of the paper was to determine the kinematic parameters that influence the occupant injury risk through a mathematical model. The developed model is a 2D model composed of 4 bodies (2 vehicles, thorax and head). The head and thorax are interconnected with a rotation joint and a torsion spring meant to stiffen the relative movement between the bodies. The thorax is connected with the vehicle body by a linear spring meant to simulate the seatbelt stiffness. The model was solved using Lagrange principle and the validation of the model was made through a crash test performed using the same initial conditions and comparing the obtained values of the displacement, velocity and acceleration parameters with the ones obtained with the mathematical model. The head and torso were chosen due to the fact that they are the common parts of the body that get injured, especially the head with the change of 80 % to cause fatal injury in car’s frontal collision. Once the model was validated, the stiffness of the seatbelt was modified in order to determine the behavior of the occupant in case of car frontal collisions. When the seatbelt stiffness was reduced, the occupant displacement and velocity increased, while by increasing the stiffness, these parameters decreased. The values of the developed model presented a high degree of similarity with the results obtained from the crash test with an error of 10 %. This model can be used by engineers to easily asses the occupant injury risk in case of vehicle frontal collisions.