Potential Air Emission Sources and Modelling the Impact of Air Pollution on Public Health in Ho Chi Minh City for Policy Making and Awareness Creation using Machine Learning

Bang Quoc Ho,Hoang Ngoc Khue Vu,Thoai Tam Nguyen,Thi Thuy Hang Nguyen,Ricardo Simon Carbajo,Quan Le,Rajnish Rakholia 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10

Air in Ho Chi Minh city is polluted by PM2.5 (particle matter with the diameter is less than 2.5 μm, so-called PM2.5), O₃, CO, NO₂ and TSP which greatly affects public health. Ho Chi Minh City (HCMC) had 8,640,000 inhabitants with a total of 7,339,552 motorcycles and 637,323 automobiles. There are about 2,807 factories releasing air emission, 2,061,957 household and 5,096 restaurants in the city. A comprehensive study is required to evaluate causes of air pollution and the impacts of air pollution level to public health in this city. The aim of this study is to: (i) Application EMISENS model and other tools to calculate air emission in HCMC and (ii) Modelling the Impact of Air Pollution on Public Health in Ho Chi Minh City for Policy Making and Awareness Creation using Machine Learning. The results showed that comprehensive EI and GHG over HCMC in 2019 was conducted in this project by following the top-down and bottom-up approaches and IPCC-2006 methodology. The estimation of the emission of different types of sources including line, point, area, and the biogenic source was conducted. Traffic sources accounted for the largest emissions for almost all pollutants. Motorcycles were the dominant emission source of all pollutants for on-road sources, accounting for 35.3%, 91.4%, 65.4%, 70.4%, 99.4% and 79.9% of the total line sources emissions for NOx, CO, SOx, NMVOC, CH₄ and PM2.5, respectively. Industrial activities contributed the highest emission of PM2.5 about 39.7% of the total of PM2.5 in HCMC in 2019. The area sources accounted for 38.9% of TSP and 23.5% of PM2.5 in HCMC, whereas, others were negligible sources. Biogenic sources, particularly from greenery, agriculture, mangroves, etc. of the HCMC emitted 4.6% of total NMVOC emissions of the whole city. Motorcycles contributed the highest emission of PM2.5 for all single sources of emission in HCMC. For PM2.5, motorbikes contribute 24.5% of HCMC"s total PM2.5 emissions, Households, Textiles, Metal Production, Food, Restaurants, Seaports, Manufacturing Paper respectively is 15.1, 10.0, 9.1, 6.8, 6.7, 5.8 and 3.8, respectively. With SO₂, motorcycles, Thermo-electricity, Seaports, Textile, Cars, Food, Metal production and HDVs contribute 24.6, 20.7, 11.7, 8.6, 6.6, 5.5, 5.0 and 3.8% of total SO₂ emission of HCMC. Study also develop air quality automatically monitoring network and install 6 air quality stations around HCMC, then apply Machine Learning to analysis/extrapolate hourly air quality data for HCMC, then modeling the the Impact of air Pollution on hospital admission in HCMC. The 13 measure to reduce air pollutants should be based on this detailed EI emission.

A Novel Injectable pH–Temperature Sensitive Hydrogel Containing Chitosan–Insulin Electrosprayed Nanosphere Composite for an Insulin Delivery System in Type I Diabetes Treatment

Thuy An Trinh,Thai Minh Duy Le,Hoang Gia Vinh Ho,Thi Cam Thach To,Vu Viet Linh Nguyen,Dai Phu Huynh,Doo Sung Lee 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1

Faculty of Materials Technology, Ho Chi Minh University of Technology (HCMUT)/Vietnam National University Ho Chi Minh City; ¹School of Chemical Engineering and Theragnostic Macromolecules Research Center, Sungkyunkwan University; ²Vietnam National University Ho Chi Minh City/National Key Laboratory of Polymer and Composite Materials, Ho Chi Minh University of Technology, Vietnam National University; ³Faculty of Materials Technology, Ho Chi Minh University of Technology (HCMUT)/ Vietnam National University Ho Chi Minh City/Research Center for Polymeric Materials, Ho Chi Minh University of Technology, Vietnam National University In this research, a novel insulin composite delivery system was prepared and characterized. Insulin drug was loading in chitoshan nanospheres using electrospraying method, a pH- and temperature-sensitive biodegradable hydrogel, which is an oligomer serine-poly(lactide)-poly(ethylene glycol)-poly (lactide)-oligomer serine (OS-PLA-PEG-PLA-OS) pentablock copolymer was used as a matrix to containing chitosan–insulin electro sprayed nanospheres (CIN). The properties of the OS-PLA-PEG-PLA-OS pentablock copolymer and the chitosan–insulin nanoparticles such as sol-gel transition, degradation in vitro and in vivo were characterized. The results showed that the chitosan–insulin nanospheres uniformly distributed in the matrix had a reinforcing effect on the mechanical properties and prolonged the degradation time of the hydrogel depot under body conditions. In addition, the cytotoxicity experiment results indicate that the composite could be used as a biomaterial for drug delivery system. The composite solutions accommodating different concentrations of the chitosan–insulin nanospheres were subcutaneously injected into induced diabetic BALB/c mice to study the in vivo insulin-release profile. The result showed that insulin concentrations in blood plasma were maintained at a steady-state level. Furthermore, the bio-properties of the insulin were retained and it showed a blood glucose level reducing effect for more than 60 hours after injection to a streptozotocin (STZ)-induced diabetic mouse model. The results suggested that this injectable pH–temperature sensitive hydrogel containing chitosan– insulin electro sprayed nanosphere composites has promising potential applications for type 1 diabetes treatment.

The impact of hyperandrogenism on the outcomes of ovulation induction using gonadotropin and intrauterine insemination in women with polycystic ovary syndrome

Ho, Vu Ngoc Anh,Pham, Toan Duong,Nguyen, Nam Thanh,Hoang, Hieu Le Trung,Ho, Tuong Manh,Vuong, Lan Ngoc The Korean Society for Reproductive Medicine 2022 Clinical and Experimental Reproductive Medicine Vol.49 No.2

Objective: This study aimed to investigate the impact of hyperandrogenism (HA) on the outcomes of ovulation induction (OI) using gonadotropin and intrauterine insemination (IUI) in patients with polycystic ovary syndrome (PCOS). Methods: This was a retrospective cohort study including 415 patients undergoing OI using gonadotropin and IUI treatment between January 2018 and December 2020 at a single infertility center. Baseline characteristics, clinical and laboratory parameters, and pregnancy outcomes were investigated. Results: Among the study population, there were 105 hyperandrogenic (25.3%) and 310 non-hyperandrogenic patients (74.7%). The live birth rate was lower in the HA group than in the non-HA group, but this difference did not reach statistical significance due to the limited sample size (14.3% vs. 21.0%, relative risk=0.68; 95% CI, 0.41-1.14, p=0.153). No predictive factors for live birth were identified through logistic regression analysis. Conclusion: HA did not negatively affect the outcomes of OI using gonadotropin and IUI cycles in Vietnamese women with PCOS. The result may not be applicable elsewhere due to the large variation in the characteristics of women with PCOS across races and populations.

A Study on an Adaptive Robust Fuzzy Controller with GAs for Path Tracking of a Wheeled Mobile Robot

Hoang-Giap Nguyen,Won-Ho Kim,Jin-Ho Shin 한국지능시스템학회 2010 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.10 No.1

This paper proposes an adaptive robust fuzzy control scheme for path tracking of a wheeled mobile robot with uncertainties. The robot dynamics including the actuator dynamics is considered in this work. The presented controller is composed of a fuzzy basis function network (FBFN) to approximate an unknown nonlinear function of the robot complete dynamics, an adaptive robust input to overcome the uncertainties, and a stabilizing control input. Genetic algorithms are employed to optimize the fuzzy rules of FBFN. The stability and the convergence of the tracking errors are guaranteed using the Lyapunov stability theory. When the controller is designed, the different parameters for two actuator models in the dynamic equation are taken into account. The proposed control scheme does not require the accurate parameter values for the actuator parameters as well as the robot parameters. The validity and robustness of the proposed control scheme are demonstrated through computer simulations.

Adsorptive Desulfurization of Diesel for Fuel Cell Applications: A Screening Test

Hoang Phuoc Ho,Woo Hyeong Kim,So-Yun Lee,Hong-Rok Son,Nak Hyeon Kim,Jae-Kon Kim,Jo-Yong Park,Hee Chul Woo 한국청정기술학회 2014 청정기술 Vol.20 No.1

경유는 연료전지 시스템의 연료원으로써 주목받고 있는 탄화수소 액체연료 중 하나로, 연료개질 촉매와 연료전지의 전극재료를 피독시키는 황화합물을 포함하고 있어 탈황공정이 필요한 것으로 여겨지고 있다. 다양하고도 대안적인 탈황기술이 연구되고 있으나, 초저유황 경유의 탈황 연구는 여전히 부진한 실정이다. 본 연구는 용융탄산염 연료전지 시스템에 응용될 수 있는 원료인 상용초저유황 경유의 탈황에 관한 것이다. 여기서 초저유황의 흡착탈황을 위한 흡착제로 활성탄, 제올라이트, 금속산화물 계 상용흡착제 후보군이 선정되었고 유망한 탈황제를 찾기 위한 스크리닝 평가를 실시하였다. 그 결과 초저유황 경유의 황농도를 0.1 ppmw 수준까지 떨어뜨리기 위한 흡착제 종류로 금속산화물계가 매우 유용하며, 활성탄과 제올라이트 흡착제는 같은 실험조건에서 해당 수준의 황 농도에 이르지 못하는 것으로 나타났다. During the past decades much attention has been paid to the desulfurization of diesel oil which is important as a source for the fuel cells to prevent the sulfur poisoning of both diesel steam reforming catalyst and electrode of fuel cell. Although alternative desulfurization techniques have been investigated, desulfurization for ultra-low sulfur diesel (ULSD) is still challenged. Therefore, this research focuses on the desulfurization of commercial ULSD for the application to molten carbonate fuel cell (MCFC). Herein, the performances of several kinds of commercial adsorbents based on activated carbons, zeolites, and metal oxides for desulfurization of ULSD were screened. The results showed that metal oxides based materials can feasibly reduce sulfur concentration in ULSD to a level of 0.1 ppmw while activated carbons and zeolites did not reach this level at current conditions.

The Role of Vehicle Currency in ASEAN-EU Trade: A Double-Aggregation Method

Ho Hoang Gia BAO,Hoang Phong LE 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.5

This study is the first to scrutinize how real effective exchange rate, together with the vehicle currency exchange rate, asymmetrically influences the total trade balance between ASEAN (Association of Southeast Asian Nations) and the EU (European Union). This research employs quarterly data between 2000Q1 and 2018Q1, which is derived from several sources. We introduce a method for constructing the double-aggregated real effective exchange rate between ASEAN and the EU that captures the roles of all their currencies. Moreover, we propose the formula to compute vehicle currency exchange rate to assess the importance of vehicle currency in ASEAN-EU trade. Additionally, as asymmetrical impacts of exchange rate on trade balance are well documented by current studies, we employ Nonlinear Autoregressive Distributed Lag (NARDL) model of Shin et al. (2014) to analyze the impacts of currency depreciation as well as appreciation in detail. The findings confirm the prominence of USD as vehicle currency in ASEAN-EU trade. Both depreciation and appreciation of ASEAN’s currencies against USD can foster ASEAN’s trade balance in the long run. Short-run asymmetrical impacts as well as J-curve effect are found in the vehicle currency models only. The results are robust for the cases of EU-28 and EU-27.

A Study on the Interrelationship between Import Substitution and Export Promotion in Korea

Hoang Ho Shin(申晃浩) 한국무역학회 1979 貿易學會誌 Vol.4 No.-

The Prominence of USD/CNY in China-EU and China-UK Trade

Ho Hoang Gia BAO,Hoang Phong LE 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.11

Despite the dominance of the USD as a vehicle currency in non-US trade, most studies on the exchange rate-trade balance relationship ignore its importance. Some recent J-curve papers have proved that incorporating the role of USD as vehicle currency as a crucial determinant of trade balance can well reflect the reality of global trade and provide more detailed findings. Motivated by this new approach and by the fact that USD is substantially used in the trade between China and the EU and the UK, this paper scrutinizes how the vehicle currency USD and the bilateral exchange rates asymmetrically affect China’s trade balance with each EU country and the UK. The results of NARDL estimation indicate that the USD models outperform the bilateral exchange rate (BER) models in terms of detecting significant long-run and short-run coefficients, which confirms the usefulness of the new approach. Also, this paper finds that the USD/CNY exchange rate cannot be neglected in China’s trade with the EU and the UK, which can supplement China’s policies on international trade and foreign exchange management.

Adsorptive Desulfurization of Diesel for Fuel Cell Applications: A Screening Test

Ho, Hoang Phuoc,Kim, Woo Hyeong,Lee, So-Yun,Son, Hong-Rok,Kim, Nak Hyeon,Kim, Jae-Kon,Park, Jo-Yong,Woo, Hee Chul The Korean Society of Clean Technology 2014 청정기술 Vol.20 No.1

경유는 연료전지 시스템의 연료원으로써 주목받고 있는 탄화수소 액체연료 중 하나로, 연료개질 촉매와 연료전지의 전극재료를 피독시키는 황화합물을 포함하고 있어 탈황공정이 필요한 것으로 여겨지고 있다. 다양하고도 대안적인 탈황기술이 연구되고 있으나, 초저유황 경유의 탈황 연구는 여전히 부진한 실정이다. 본 연구는 용융탄산염 연료전지 시스템에 응용될 수 있는 원료인 상용초저유황 경유의 탈황에 관한 것이다. 여기서 초저유황의 흡착탈황을 위한 흡착제로 활성탄, 제올라이트, 금속산화물 계 상용흡착제 후보군이 선정되었고 유망한 탈황제를 찾기 위한 스크리닝 평가를 실시하였다. 그 결과 초저유황 경유의 황농도를 0.1 ppmw 수준까지 떨어뜨리기 위한 흡착제 종류로 금속산화물계가 매우 유용하며, 활성탄과 제올라이트 흡착제는 같은 실험조건에서 해당 수준의 황 농도에 이르지 못하는 것으로 나타났다. During the past decades much attention has been paid to the desulfurization of diesel oil which is important as a source for the fuel cells to prevent the sulfur poisoning of both diesel steam reforming catalyst and electrode of fuel cell. Although alternative desulfurization techniques have been investigated, desulfurization for ultra-low sulfur diesel (ULSD) is still challenged. Therefore, this research focuses on the desulfurization of commercial ULSD for the application to molten carbonate fuel cell (MCFC). Herein, the performances of several kinds of commercial adsorbents based on activated carbons, zeolites, and metal oxides for desulfurization of ULSD were screened. The results showed that metal oxides based materials can feasibly reduce sulfur concentration in ULSD to a level of 0.1 ppmw while activated carbons and zeolites did not reach this level at current conditions.

THE RELATIONSHIP BETWEEN REMITTANCES AND INVESTMENT: EMPIRICAL EVIDENCES IN SOME DEVELOPING COUNTRIES

Ho Hoang Lan,Nguyen Thanh Trung 단국대학교 융합사회연구소 2017 공공정책과 국정관리 Vol.11 No.3

Remittance inflows are believed to be one of the most potential resources for economic growth in developing countries. However, the promising impact of remittances on investment has not been clearly agreed. This research aims to investigate the relationship between remittances and investment in nine developing countries including Vietnam in the period of 2000-2015. By using panel econometric method and descriptive analysis, the result indicates that remittances have positive impact on domestic investment. This study demonstrates the situation of remittance - investment nexus in Vietnam in recent years and suggests some implications for Vietnamese policies based on the empirical results.