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The Recent Economic Performance and Poverty Reduction in Vietnam
Le Trung Hieu,Seungmo Koo 서울대학교 국제학연구소 2007 Journal of International and Area Studies Vol.14 No.2
This study aims to determine the factors of sector gains and labor shifts on poverty of Vietnam, and examine how far the effects of these two factors on poverty reduction have changed over time. The empirical analysis utilizes data from the Vietnam Household Living Standards Survey in 1998 and 2002. As a result, agricultural sector has been central to the strong poverty reduction experienced by Vietnam over the last decade. Around 60% of the aggregate decline in poverty indicators originated from improvement in income of farmers. Lower poverty incidence of all the remaining sectors jointly accounted for around 30% and 20% of the national fall in poverty indices in 1993-1998 and 1998-2002 respectively. In contrast, as a result of quicker movements from low productivity sectors to higher productivity ones, labor shifts evolved as a more important contributing factor to poverty reduction in the same period. The highest concentration and severity of the two farmer groups, and their impressive participation in the reduction of aggregate poverty as pointed out in this study convey a strong message to policy makers, which implies that policies to reduce poverty in Vietnam must continue to reach farmers if a considerably further reduction in poverty is to be achieved.
Le Thi Le,Phan Ngoc Vu,Huu The Nguyen,Manh Van Nguyen,Hieu Trung Bui,Huy Quang Tran,Thuy Thi Thu Nguyen 한국섬유공학회 2023 Fibers and polymers Vol.24 No.9
The goal of this study was to develop an adsorptive membrane based on electrospun graphene oxide/poly(vinylidene) fluoride fiber mat coated with chitosan (GO-PVDF/CS composite membrane) which can potentially be used to remove Mn2+ from aqueous solutions by a continuous filtration process. This composite membrane was composed of two layers: the first layer was the electrospun PVDF fiber mat containing GO, supporting mechanical strength, improving hydrophilicity, and providing adsorptive sites; the second layer was a thin CS film coated on top of the first layer with the aim of significantly enhancing hydrophilicity and adsorption capacity of the composite membrane. The hydrophilicity and porosity of the GO-PVDF/CS composite membrane depended on the concentration of the CS solution, subsequently affecting the Mn2+ removal efficiency of the membrane. The GO-PVDF/CS membrane achieved the maximum Mn2+ removal efficiency of 90.7 wt% by a continuous flow filtration process with a flux of 157.3 L.m-2.h-1.bar-1. The GO-PVDF/CS membrane was able to decrease the concentration of Mn2+ from 5.72 to 0.38 mg/L in the groundwater-contaminated Mn2+ after two filtration processes, reaching the notification level of Mn2+ for drinking water that was allowed by several countries. Therefore, the GO-PVDF/CS membrane can be an effective adsorptive filtration membrane used to remove Mn2+ from groundwater.
Loi Van Le,Quang Van Vu,Thanh Van Le,Hieu Trung Le,Khue Kim Dang,Tuan Ngoc Vu,Anh Hoang Ngoc Nguyen,Thang Manh Tran 한국간담췌외과학회 2024 Annals of hepato-biliary-pancreatic surgery Vol.28 No.1
Backgrounds/Aims: Hepatolithiasis and choledocholithiasis are frequent pathologies and unfortunately, with the current treatment strategies, the recurrence incidence is still high. This study aimed to assess the outcomes of laparoscopic choledochotomy using cholangioscopy via the percutaneous-choledochal tube for the treatment of hepatolithiasis and choledocholithiasis in Vietnamese patients. Methods: A cross-sectional study of patients with hepatolithiasis and/or choledocholithiasis who underwent laparoscopic choledochotomy using intraoperative cholangioscopy via percutaneous-choledochal tube at the Department of Hepatopancreatobiliary Surgery, 108 Military Central Hospital, from June 2017 to March 2020. Results: A total of 84 patients were analyzed. Most patients were females (56.0%) with a median age of 55.56 years. Among them, 41.8% of patients had previous abdominal operations, with 33.4% having choledochotomy. All patients underwent successful laparoscopic common bile duct exploration followed by T-tube drainage without needing to convert to open surgery. Most patients (64.3%) had both intrahepatic and extrahepatic stones. The rate of stones ≥ 10 mm in diameter was 64.3%. Biliary strictures were observed in 19.1% of patients during cholangioscopy. Complete removal of stones was achieved in 54.8% of patients. Intraoperative complications were encountered in two patients, but there was no need to change the strategy. The mean operating time was 121.85 ± 30.47 minutes. The early postoperative complication rate was 9.6%, and all patients were managed conservatively. The residual stones were removed through the T-tube tract by subsequent choledochoscopy in 34/38 patients, so the total success rate was 95.2%. Conclusions: Laparoscopic choledochotomy combined with cholangioscopy through the percutaneous-choledochal tube is a safe and effective strategy for hepatolithiasis and/or choledocholithiasis, even in patients with a previous choledochotomy.
Measurement Technique of Ozone Density by Using UV Sensor System
Trung, Nguyen Huu,Van Men, Le,Van Hieu, Nguyen Institute of Korean Electrical and Electronics Eng 2015 전기전자학회논문지 Vol.19 No.1
There are many studies and products using a test paper impregnated with chemical solution can react with ozone. The color of a test paper can indicate the concentration of ozone. The purpose of this research is to design and manufacture a system using ultraviolet light source to measure the ozone density. This new technique is based on the characteristic of decomposition from ozone into oxygen under ultraviolet light. We used two sources of ultraviolet light including UV lamp and UVLED to determine the decomposition of ozone. This system is built with the electronic components, sensors and sealed pump tube to measure the ozone density in units of $g/cm^3$,ppm,ppb. In this paper,, we present some initial results of measuring the ozone density from ozone generator after completing inspection for safety.
Effect of Flexibility performance of hindwing in maneuvering flight of beetle (Allomyrina Dichotoma)
Trung-Hieu Tran,Tien Van Truong,Tuyen Le Quang,Doyoung Byun,Hoon Cheol Park 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
High ability of maneuvering and self stability of insect flight have been interesting topic for biology researchers recently. Here we investigate kinematics and role of flexibility of hind wing of Allomyrina Dichtoma in side and back turnings. Body and wing kinematics were reconstructed into three-dimensional through DLT method. Result shows that a flexibility of hindwing can increase performance significantly in turning and stability control of beetle especially in supination and pronation phases. In the downstroke phase, hindwing has positive wing camber, inversely, it is passive deformed into negative wing camber in chordwise as well as in spanwise direction at begin of upstroke. These mechanisms can create a large variant of force and moment in magnitude and direction which can change direction and altitude of beetle in maneuvering.
Maneuvering flight of beetle (Allomyrina Dichotoma)
Trung-Hieu Tran,Tien Van Truong,Tuyen Quang Le,Hoon Cheol Park,Doyoung Byun 한국항공우주학회 2009 한국항공우주학회 학술발표회 논문집 Vol.2009 No.11
Maneuvering flight has been recognized as an important characteristic of insects and animals where these species frequently use. Here we investigate kinematics and role of flexibility of hind wing of Allomyrina Dichtoma in which body and wing kinematics were reconstructed into three?dimensional through DLT method. Result shows that a flexibility of hind wing can increase performance significantly in turning and stability control of beetle especially in supination and pronation phases. In the downstroke phase, hindwing has positive wing camber, inversely, it is passive deformed into negative wing camber in chordwise as well as in span wise direction at begin of upstroke. These mechanisms can create a large variant of force and moment In magnitude and direction which can change direction and altitude of beetle in maneuvering.