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Truong Giang Nguyen,Thanh Khiem Nguyen,Ham Hoi Nguyen,Hong Son Trinh,Tuan Hiep Luong,Minh Trong Nguyen,Van Duy Le,Hai Dang Do,Kieu Hung Nguyen,Van Minh Do,Quang Huy Tran,Cuong Thinh Nguyen 한국간담췌외과학회 2024 Annals of hepato-biliary-pancreatic surgery Vol.28 No.1
Backgrounds/Aims: Parenchymal-sparing anatomical hepatectomy (Ps–AH) based on portal ramification of the right anterior section (RAS) is a new technique to avoid unnecessarily transecting too much liver parenchyma, especially in cases of major anatomical hepatectomy. Methods: We prospectively assessed 26 patients with primary hepatic malignancies having undergone major Ps–AH based on portal ramification of the RAS from August 2018 to August 2022 (48 months). The perioperative indications, clinical data, intra-operative index, pathological postoperative specimens, postoperative complications, and follow-up results were retrospectively evaluated. Results: Among the 26 patients analyzed, there was just one case that had intrahepatic cholangiocarcinoma The preoperative level of α– Fetoprotein was 25.2 ng/mL. All cases (100%) had Child–Pugh A liver function preoperatively. The ventral/dorsal RAS was preserved in 19 and 7 patients, respectively. The mean surgical margin was 6.2 mm. The mean surgical time was 228.5 minutes, while the mean blood loss was 255 mL. In pathology, 5 cases (19.2%) had microvascular invasion, and in the group of HCC patients, 92% of all cases had moderate or poor tumor differentiation. Six cases (23.1%) of postoperative complications were graded over III according to the Clavien–Dindo system, including in three patients resistant ascites or intra-abdominal abscess that required intervention. Conclusions: Parenchymal-sparing anatomical hepatectomy based on portal ramification of the RAS to achieve R0-resection was safe and effective, with favorable short-term outcomes. This technique can be used widely in clinical practice.
Nguyen Van Hieu,Le Thi Ngoc Loan,Nguyen Duc Khoang,Nguyen Tuan Minh,Do Thanh Viet,Do Cong Minh,Tran Trung,Nguyen Duc Chien 한국물리학회 2010 Current Applied Physics Vol.10 No.2
In this paper, a very simple procedure was presented for the reproducible synthesis of large-area SnO2nanowires (NWs) on a silicon substrate by evaporating Sn powders at temperatures of 700, 750, and 800 ℃. As-obtained SnO2 NWs were characterized by field emission scanning electron microscopy (FESEM),transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy. They revealed that the morphology of the NWs is affected by growth temperature and the SnO2 NWs are single-crystalline tetragonal. The band gap of the NWs is in the range of 4.2–4.3 eV as determined from UV/visible absorption. The NWs show stable photoluminescence with an emission peak centered at around 620 nm at room-temperature. The sensors fabricated from the SnO2 NWs synthesized at 700 ℃ exhibited good response to LPG (liquefied petroleum gas) at an operating temperature of 400 ℃.
Nguyen, Thanh Tuan,Bandyopadhyay, Parthasarathi,Li, Xuyang,Kim, Nam Hoon,Lee, Joong Hee Elsevier 2017 Journal of membrane science Vol.540 No.-
<P><B>Abstract</B></P> <P>In this study, the organo-soluble dodecylamine amine (DDA)-modified reduced graphene oxide (DDA-rGO) was synthesized using two different grafting methods. DDA was covalently bonded with GO sheets by direct amidation processes in the presence of N,N′-Dicyclohexylcarbodiimide (DCC), followed by reduction with hydrazine hydrate to prepare the DDA-modified reduced GO (DDA-rGO1). Analogous DDA-modified rGO (DDA-rGO2) was prepared by modifying GO with DDA in the absence of DCC. The ultraviolet−visible spectra showed that the DMF dispersion of DDA-rGO1 and DDA-rGO2 followed Beer's law and their molar extinction coefficient values were calculated to be 64 and 44mLmg<SUP>−1</SUP> cm<SUP>−1</SUP>, respectively. The AFM, TEM, and TGA confirm the higher amount of DDA attached in DDA-rGO1. These fillers with various loading amounts were successfully used to synthesize several composite films using polyurethane (PU) as matrix. All nanocomposites showed excellent improvement in mechanical and gas barrier properties than PU. DDA-rGO1-4/PU with 4wt% DDA-rGO1 improved the tensile modulus (<I>E</I>) by 204% and reduced O<SUB>2</SUB> permeability (<I>P</I>) to 84% compared to PU. On other hand, DDA-rGO2-4/PU enhanced the <I>E</I> by 122% and declined <I>P</I> to 80% compared to PU. The DDA-rGO1 demonstrated a better reinforcing efficiency to improve the mechanical and gas barrier properties.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Dodecylamine-modified graphene oxide was prepared using two different methods. </LI> <LI> Composites were prepared with modified graphene oxide and polyurethane (PU). </LI> <LI> Composites showed very high tensile modulus (178MPa) compared to PU (58.5). </LI> <LI> Composite exhibited <I>up to</I> 84% decrease in O<SUB>2</SUB> permeability compared to PU. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Different methods to functionalize graphene oxide by dodecylamine and their effects on the physical properties of polyurethane nanocomposite films.</P> <P>[DISPLAY OMISSION]</P>
Design of a Fuel Cell Power Conditioning System for Online Diagnosis and Load Leveling
Thanh-Tuan Nguyen,Van-Tuan Doan,Woojin Choi 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
A fuel cell power conditioning system for online diagnosis and load leveling under the condition of varying load is developed in this study. The proposed system comprises a unidirectional boost converter and a bidirectional buck–boost converter with a battery. The system operates in two different modes. In normal mode, the bidirectional converter is utilized for load leveling; in diagnostic mode, it is utilized to control load voltage while the boost converter generates perturbation current to implement the online diagnosis function through in-situ electrochemical impedance spectroscopy (EIS). The proposed method can perform EIS for a fuel cell under varying-load conditions with no influence on the load. The validity and feasibility of the proposed system are verified by experiments, and the design procedure of the proposed system is detailed.
Nguyen, Thanh Binh,Nguyen, Van Tuan,Chung, Sun-Tae,Cho, Seongwon Korea Multimedia Society 2016 멀티미디어학회논문지 Vol.19 No.8
In this paper, we propose a new real-time human detection under omni-directional cameras for visual surveillance purpose, based on CNN with unified detection and AGMM. Compared to CNN-based state-of-the-art object detection methods. YOLO model-based object detection method boasts of very fast object detection, but with less accuracy. The proposed method adapts the unified detecting CNN of YOLO model so as to be intensified by the additional foreground contextual information obtained from pre-stage AGMM. Increased computational time incurred by additional AGMM processing is compensated by speed-up gain obtained from utilizing 2-D input data consisting of grey-level image data and foreground context information instead of 3-D color input data. Through various experiments, it is shown that the proposed method performs better with respect to accuracy and more robust to environment changes than YOLO model-based human detection method, but with the similar processing speeds to that of YOLO model-based one. Thus, it can be successfully employed for embedded surveillance application.
Thanh Tuan Nguyen,박재영,Seung Hoon Nahm,백운봉 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.1
Hydrogen compatibility of materials refers to the ability to exhibit reliable mechanical integrity and a probability of failure in a given hydrogen-exposed environment. Currently, no experimental methods for qualifying the hydrogen compatibility of materials have been standardized, and testing expertise has been restricted to only a few laboratories. With international coordination, this paper presents the experimental activities and results to establish a code of practice. The experimental campaign included a slow strain rate tensile (SSRT) test and a notched fatigue life test on SUS316L-grade austenitic stainless steel, which has been widely used in structural components in hydrogen service. Sub-sized tensile specimens were machined from a bar with a gauge diameter of 4.00 mm and a gauge length of 20 mm. A notched specimen with a notch angle of 60°, notch radius of 0.12 mm, and net section diameter of 4 mm was prepared for the fatigue life test. The net section stress in the notched specimen at maximum load (σ max ) was 444 MPa in a tension–tension loading condition with a loading ratio of R = 0.1. The tests were performed at a temperature of 233 K (-40 °C) in two environmental conditions: high-pressure hydrogen gas at 90 MPa and nitrogen gas at 0.1 MPa (three tests for each condition). No noticeable degradation in yield strength and tensile strength was observed in the specimens tested under hydrogen pressure of 90 MPa H 2at -40 °C compared to that tested 0.1 MPa N 2 at -40 °C, however, hydrogen had a remarkable effect on reduction area (RA), and strain at fracture. The consistency of the experimental conditions and results from different laboratories with a distinct testing system were closely compared and discussed.