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Reporting cervical effacement as a percentage: How accurate is it?  [PDF]
Radha Malapati, Yen N. Vuong, Tuan M. Nguyen
Open Journal of Obstetrics and Gynecology (OJOG) , 2013, DOI: 10.4236/ojog.2013.37102

Objective: To evaluate the accuracy of cervical effacement reported as a percentage by digital cervical exams using cervical length determined by transvaginal ultrasonography as a standard. Methods: Records of pregnant women who had a digital cervical exam and subsequent transvaginal ultrasound scan for cervical length between January 2005 and December 2008 were reviewed. Digital cervical exams were performed by different examiners. Transvaginal ultrasound was performed by one examiner who did not perform any of the digital exams. Cervical effacements were recorded as a percentage and cervical lengths were measured in centimeters. Results: A total of 173 women met the study criteria. Average cervical length for 0% effacement was 3.3 ± 1.1 cm (0.8 - 5.0 cm); 20% effacement, 1.6 ± 1.0 cm (0.9 - 3.0 cm); 25% effacement, 2.2 ± 0.2 cm (2.0 - 2.3 cm); 30% effacement, 2.6 ± 0.4 cm (2.1 - 3.0 cm); 40% effacement, 3.0 ± 0.4 cm (2.6 - 3.4 cm); 50% effacement, 2.4 ± 1.1 cm (0.6 - 4.6 cm); 60% effacement, 2.3 ± 1.4 cm (0.7 - 4.3 cm); 70% effacement, 2.2 ± 0.8 cm (1.1 - 3.3 cm); 75% effacement, 1.7 ± 1.4 cm (0.7 - 2.7 cm); 80% effacement, 2.0 ± 0.9 cm (0.6 - 4.4 cm); 90% effacement, 0.7 ± 0.4 cm (0.4 - 0.9 cm); 100% effacement, 1.2 ± 1.5 cm (0.3 - 3.0 cm). The coefficient of variation ranges from 10% - 124%. Conclusion: The traditional method of reporting cervical effacement as a percentage is unacceptably inaccurate compared to the actual cervical length determined by vaginal probe ultrasound.

A Review of Cyber Threats and Defence Approaches in Emergency Management
George Loukas,Diane Gan,Tuan Vuong
Future Internet , 2013, DOI: 10.3390/fi5020205
Abstract: Emergency planners, first responders and relief workers increasingly rely on computational and communication systems that support all aspects of emergency management, from mitigation and preparedness to response and recovery. Failure of these systems, whether accidental or because of malicious action, can have severe implications for emergency management. Accidental failures have been extensively documented in the past and significant effort has been put into the development and introduction of more resilient technologies. At the same time researchers have been raising concerns about the potential of cyber attacks to cause physical disasters or to maximise the impact of one by intentionally impeding the work of the emergency services. Here, we provide a review of current research on the cyber threats to communication, sensing, information management and vehicular technologies used in emergency management. We emphasise on open issues for research, which are the cyber threats that have the potential to affect emergency management severely and for which solutions have not yet been proposed in the literature.
Characteristics of Filtered Neutron Beam Energy Spectra at Dalat Reactor  [PDF]
Tran Tuan Anh, Pham Ngoc Son, Vuong Huu Tan, Pham Dinh Khang, Phu Chi Hoa
World Journal of Nuclear Science and Technology (WJNST) , 2014, DOI: 10.4236/wjnst.2014.42015

Filtered neutron technique was applied for producing quasi-monoenergetic neutron beams of 24 keV, 54 keV, 133 keV and 148 keV at the horizontal neutron channel No. 4 of the Dalat Nuclear Research Reactor. The study on physical characteristics of these beam lines has been carried out for efficient applications in neutron capture experiments. The filtered neutron spectrum of each beam has been simulated by Monte-Carlo method and experimentally measured by a gas-filled protonrecoil spectrometer. The neutron fluxes of these filtered beams were measured by the activation technique with standard foils of 197Au, using a high efficient HPGe digital gamma-ray spectrometer.

Development of 24 and 59 keV Filtered Neutron Beams for Neutron Capture Experiments at Dalat Research Reactor  [PDF]
Pham Ngoc Son, Vuong Huu Tan, Phu Chi Hoa, Tran Tuan Anh
World Journal of Nuclear Science and Technology (WJNST) , 2014, DOI: 10.4236/wjnst.2014.42010

External filtered neutron beams have been developed at the horizontal radial channels No. 4 of Dalat research reactor. In the material composition of the neutron filters, the primary material components of Iron, Aluminum, Nickel and Vanadium are used to obtain the mono-energetic neutron beams of 24 and 59 keV, with low level of Gamma and slow neutron background. A computer code and Monte-Carlo simulation technique were applied to optimize the filter configurations and to deduce the neutron energy distributions in the filtered beams. A hydrogen-filled proton recoil detector and the activation method with Gold foils were used to measure the neutron energy spectrum and flux of each beam at sample position. The results of experimental neutron fluxes are 6.1 × 105 and 5.3 × 105 n/cm2/s for 24 and 59 keV beams, respectively.

Assessment of Radiation Dose Caused by Radioactive Gaseous Effluent Released from Nuclear Power Plant Ninh Thuan 1 under Scenario of Normal Working Conditions  [PDF]
Nguyen Tuan Khai, Do Xuan Anh, Le Dinh Cuong, Duong Duc Thang, Vuong Thu Bac, Nguyen Thi Thu Ha, Nguyen Quang Long, Trinh Van Giap, Nguyen Hao Quang
World Journal of Nuclear Science and Technology (WJNST) , 2015, DOI: 10.4236/wjnst.2015.53018
Abstract: Based on guides RG 1.109, RG 1.111 published by United States Nuclear Regulatory Commission (USNRC), our research concentrates in assessing radiation doses caused by radioactive substances released from the nuclear power plant (NPP) Ninh Thuan 1 under the scenario of normal operation using software package NRCDose72 provided by the USNRC. The database including the released radioactive nuclides, meteorology, terrain, population and agricultural production activities have been collected and processed to build the input data for the model calculation. The wind rose distribution obtained from the meteorological data in a five-year period from 2009-2013 showed that the radioactive nuclides released to environment spread in two main wind directions which are North East and South West. The X/Q (s/m3) and D/Q (s/m2) qualities which are, respectively, the ratio of activity concentration to release rate and that of deposition density of radioactive nuclides to release rate were calculated within an area of 80 km radius from the NPP site using XOQDOQ. Population doses were calculated using GASPAR. The XOQDOQ and GASPAR are two specific softwares in NRCDose72 package.
Ex-Ante Asymmetric Regulation and Retail Mmarket Competition: Evidence from Europe’s Mobile Industry  [PDF]
Edmond Baranes, Cuong Hung Vuong
Technology and Investment (TI) , 2011, DOI: 10.4236/ti.2011.24031
Abstract: The aim of this paper is to assess the impacts of ex-ante asymmetric mobile termination rate regulation on ex-post market competition in the Europe’s mobile industry. Two regulatory instruments associated with the asymmetry between operators are implemented, namely glide path regulation and asymmetric regulation. The first regulatory device is to gradually decrease asymmetric treatment between mobile and fixed network operators while the second one is associated with asymmetric flexibility in setting MTRs between European mobile operators. With different model specifications, our study demonstrates that when the MTRs are regulated to lower levels, later entrants are likely to cut retail prices to gain more subscribers, and resulting in lower average national service prices. Furthermore, we find that asymmetric regulation plays a positive role on entrant penetration as well as the competitiveness of Europe’s mobile markets.
Use of Continuous Regional Anesthetic for Management of Pediatric Sickle Cell Crisis  [PDF]
Julie T. Vuong, Milena Pilipovic
Open Journal of Anesthesiology (OJAnes) , 2012, DOI: 10.4236/ojanes.2012.25053
Abstract: Sickle cell patients often find difficulty obtaining adequate treatment of pain. Anti-inflammatory medications, steroids, and opioids can reduce pain; however their use is limited by side effects. We present a 12 year old female with sickle cell disease who was admitted with severe right thigh pain secondary to acute infarction of the proximal femoral diaphysis.She was treated with intravenous hydration, ketorolac and opioids with no relief. The patient agreed to a continuous femoral nerve block, which was done under sedation. Pain relief was obtained immediately. The infusion was discontinued after 3 days and the patient was discharged the day after catheter removal with a one week supply of fentanyl patches and home dose of oral oxycodone. We suggest continuous femoral nerve block as an adjunct to treat sickle cell pain crises involving the lower extremity. Regional techniques may vasodilate and thus improve the nociceptive, vasoconstrictive pain associated with acute pain crises.
New facility for the (n,2g) reaction investigation at the Dalat Reactor
Pham Dinh Khang,Vuong Huu Tan,Nguyen Xuan Hai,Nguyen Duc Tuan,Ho Huu Thang,A. M. Sukhovoj,V. A. Khitrov
Physics , 2013,
Abstract: The summation amplitude of coincident pulses (SACP) method which is optimal solution to reduce compton scatter phenomenon and pairs phenomenon in the gamma spectra of nuclei decay gamma cascades was used. In the 1982, in comparision with original method [1], it was improved such as the interfacing techniques, and data analysis with aid of computer [2]. In order to get better, the fast/slow coincidence spectroscopy system was developed into a fast coincidence spectroscopy. It is advantageous and easy operation. The off-line measure results with radioactive source 60-Co and on-line measure results with 35-Cl target on the tangential channel of Dalat Research Reactor were showed the good abilities of this spectroscopy system.
The egg or the chicken?
Vuong DuThinh,

老年心脏病学杂志(英文版) , 2006,
Abstract: In this issue of the Journal of Geriatric Cardiology, Gao et al.,1 in a report of increased ostial pulmonary vein diameter by multislice CT angiography reported a statistically signifi-cant enlargement of the pulmonary veins in patients with con-gestive heart failure (CHF). This finding alone should not be of any surprise as anatomic remodeling and general dilation of the cardiac chambers are well described in patients with CHF. What is thought provoking is the conjecture that pulmonary vein ostial dilation may play a role in the genesis and mainte-nance of atrial fibrillation. Multiple theories of the mechanism of atrial fibrillation exist, but it is safe to assume that disper-sion of refractoriness in the left atrium is a necessary condi-tion to maintain atrial fibrillation. Whether the mere anatomi-cal change of the pulmonary vein ostia in CHF is sufficient to create this dispersion of refractoriness is a matter of hot debate. This report by Gao et al. however, is important in the implica-tion of the use of this novel imaging technique for the purpose of identifying and visualizing the pulmonary vein ostia for atrial fibrillation ablation.
Successful Peripartum Use of an Intrathecal Morphine Pump  [PDF]
Julie T. Vuong, Jill M. Eckert
Open Journal of Anesthesiology (OJAnes) , 2012, DOI: 10.4236/ojanes.2012.25051
Abstract: As intrathecal pumps are now widely used for management of pain and spasticity, there are more women of child-bearing age who have intrathecal pumps already implanted at time of conception of their children. There is little in the way of guidelines for how to manage these women, especially those with intrathecal pumps infusing analgesics, throughout pregnancy and after birth. We present a woman who presented at 19 weeks of gestation for consultation of long term pain management, with 3 years of postpartum follow up.
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