TÓM TẮT: Nghiên cứu này xem xét mối quan hệ giữa chất lượng dịch vụ siêu thị, sự thỏa mãn và lòng... more TÓM TẮT: Nghiên cứu này xem xét mối quan hệ giữa chất lượng dịch vụ siêu thị, sự thỏa mãn và lòng trung thành của người tiêu dùng đối với siêu thị. Các mối quan hệ này được kiểm định với 318 khách hàng tại siêu thị ở TPHCM. Kết quả nghiên cứu cho thấy chất ...
Cuộc cách mạng công nghiệp 4.0 đang có tác động mạnh mẽ đến các nước trên thế giới ở nhiều lĩnh v... more Cuộc cách mạng công nghiệp 4.0 đang có tác động mạnh mẽ đến các nước trên thế giới ở nhiều lĩnh vực như cơ cấu ngành nghề, nhu cầu nguồn nhân lực, hệ thống quản trị sản xuất, ... Giao thông vận tải là ngành có tính cộng đồng hóa rất cao nên cũng sẽ chịu tác động mạnh mẽ của cuộc cách mạng công nghiệp này. Những thành tựu của cách mạng công nghiệp 4.0 có thể tái định hình lại hệ thống giao thông vận tải của các quốc gia. Điều đó đặt ra thách thức cho các nhà quản lý vận tải phải thay đổi mô hình hoạt động cũng như những chính sách liên quan đến vận tải. Bài viết trình bày tổng quan về cách mạng công nghiệp 4.0 và những khía cạnh chính của ngành giao thông vận tải đang chịu tác động của cách mạng công nghiệp 4.0
Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2019
Phát triển ngành nông nghiệp công nghệ cao là xu thế tất yếu của sản xuất nông nghiệp Việt Nam nó... more Phát triển ngành nông nghiệp công nghệ cao là xu thế tất yếu của sản xuất nông nghiệp Việt Nam nói chung và của tỉnh Thái Nguyên nói riêng. Thái Nguyên là tỉnh trung tâm của vùng Trung du và Miền núi phía Bắc, có điều kiện tự nhiên và tài nguyên thiên nhiên phong phú để phát triển kinh tế, đặc biệt là phát triển ngành nông nghiệp. Tuy nhiên, để ngành này phát triển bền vững, ngoài tiến bộ khoa học công nghệ thì nguồn nhân lực đủ khả năng ứng dụng thành tựu khoa học công nghệ vào sản xuất nông nghiệp là một yếu tố quan trọng. Bài viết đánh giá chung về thực trạng nguồn nhân lực ở Thái Nguyên và đề xuất một số giải pháp để tăng số lượng và nâng cao chất lượng nguồn nhân lực hướng tới phát triển nông nghiệp công nghệ cao.
Introduction: COPD is serious public health problem in over the world. In Vietnam, the prevalence... more Introduction: COPD is serious public health problem in over the world. In Vietnam, the prevalence of COPD is 4.2% of the general population. Since December 2010, program for COPD and asthma management is incorporated in the national program against non-communicable diseases. Objectives: To determine the knowledge, attitude and practices (KAP) regarding to diagnosis and management of COPD among doctors in hospitals of 10 cities and provinces in the Northern Vietnam. Methods: A standardized questionnaire was completed by 461 doctors to assess their KAP in diagnostic and management of COPD before their participation in training course from June to December 2012. Results: Among 461 respondents, there were 66.8% doctors who work in the province/city hospitals and 33.2% doctors in the district hospitals. Majority of doctors did not fully understand the risk factors of the disease; the most important risk factor for COPD were cigarette smoke (89.8% of the doctor), followed by biomass smoke and dust (51.5%), respiratory infections (38.5%), gene factor (16.3%), abnormalites in lung (9.1%), socio – economic factors (5.0%). Only 43.9% of doctors were able to list the 4 criteria to diagnose COPD and only 23.5% of doctors had the correct answer for the staging of COPD according GOLD 2011. Results showed that only 14.3 % of doctors guided patients to use the drug delivery devices in the prescription. Conclusion: Our results revealed that, there is lack of awareness and urgent need of education on diagnosis and management of COPD for Vietnamese doctors.
Paclitaxel is one of the most effective chemotherapeutic agents for treating various types of can... more Paclitaxel is one of the most effective chemotherapeutic agents for treating various types of cancer. However, the clinical application of paclitaxel in cancer treatment is considerably limited due to its poor water solubility and low therapeutic index. Thus, it requires an urgent solution to improve therapeutic efficacy of paclitaxel. In this study, folate decorated paclitaxel loaded PLA-TPGS nanoparticles were prepared by a modified emulsification/solvent evaporation method. The obtained nanoparticles were characterized by Field Emission Scanning Electron Microscopy (FESEM), Fourier Transform Infrared (FTIR) and Dynamic Light Scattering (DLS) method. The spherical nanoparticles were around 50 nm in size with a narrow size distribution. Targeting effect of nanoparticles was investigated in vitro on cancer cell line and in vivo on tumor bearing nude mouse. The results indicated the effective targeting of folate decorated paclitaxel loaded copolymer nanoparticles on cancer cells both in vitro and in vivo.
Although economic reform has brought remarkable progress in poverty reduction in Vietnam, the sca... more Although economic reform has brought remarkable progress in poverty reduction in Vietnam, the scale and depth of ethnic minority poverty in Vietnam presents one of the major challenges to achieving the targets for poverty reduction set out in the SocioEconomic Development Plan, as well as the Millennium Development Goals. We first review a series of monetary and non-monetary indicators which show the living standards of the ethnic minorities are improving but still lag seriously behind those of the majority Kinh-Hoa. The minorities' lower living standards result from the complex interplay of overlapping disadvantages, which start in utero and continue until adult life. Next an analysis of the drivers of the ethnic gap, in terms of both differences in characteristics and differences in returns to those characteristics, is undertaken. Mean and quantile decompositions show that at least a half of the gap in per capita expenditure can be attributed to the lower returns to characteristics that the ethnic minorities receive. The reasons underlying such differences in returns are discussed, drawing on both quantitative analysis and the large number of qualitative studies on ethnic issues in Vietnam. Finally, some of the short and longer term policy measures which we believe could help to counter ethnic disadvantages in the nutrition, education and employment sectors are discussed. We also emphasize the importance of promoting growth that is geographically broad and socially inclusive − without which, the current disparities between the Kinh-Hoa and the ethnic minorities will continue to grow.
2011 7th International Wireless Communications and Mobile Computing Conference, 2011
Network coverage is one of the most decisive factors for determining the efficiency of a wireless... more Network coverage is one of the most decisive factors for determining the efficiency of a wireless sensor network. However, in dangerous or hostile environments such as battle fields or active volcano areas, we can neither deterministically or purposely deploy sensors as desired, thus the emergence of coverage holes (the unmonitored areas) is unavoidable. In addition, the introduction of new coverage holes during network operation due to sensor failures due to energy depletion shall significantly reduce coverage efficacy. Therefore, we need to either remotely control or set up a protocol to heal them as soon as possible in an automated fashion. In this paper, we focus on how to schedule mobile sensors in order to cope with coverage hole issues in a hybrid sensor network containing both static and mobile sensors. To this end, we introduce a new metric, namely to maximize the minimum remaining energy of all moved sensor since the more energy remains, the longer the network can operate. Based on this metric, we propose an efficient coverage healing algorithm that always determines an optimal location for each mobile sensor in order to heal all coverage holes, after all mobile sensors locations and coverage holes are located. Simulation results confirm the efficiency and utilization of our proposed method.
Background. The goal of this study was to determine whether the production of posttransplant anti... more Background. The goal of this study was to determine whether the production of posttransplant antibodies directed against donor HLA mismatches (donor specific antibody; DSA) is associated with renal allograft rejection and early graft dysfunction. Methods. Forty-nine adult renal allograft recipients with increased risk of rejection were enrolled during the period of October 2001 through May 2003 and were prospectively monitored for the development of anti-HLA antibodies. Results. Of 49 patients, eight (16.3 %) patients were diagnosed with acute humoral rejection (AHR) and 11/49 (22.4%) patients were diagnosed with acute cellular rejection (ACR). A strong association between pretransplant HLA sensitization and AHR was found (Pϭ0.005). Of the eight patients diagnosed with AHR, the majority developed DSA before or concomitant with episodes of rejection (PϽ0.001). Only 3 of 41 patients (7.3%) without AHR developed DSA. The pathogenic role of alloantibodies was further substantiated by analyzing their association with graft function as measured by serum creatinine levels. The average serum creatinine after the third month posttransplantation in DSA producers was 2.24Ϯ1.01 mg/dL, while in non-DSA patients the average serum creatinine was 1.41Ϯ0.37 mg/dL (PϽ0.01). Conclusion. This study reveals a strong association between the production of DSA, AHR, and early graft dysfunction. Our findings indicate that prospective monitoring for anti-HLA antibodies following transplantation is a useful test for the diagnosis and classification of AHR for identifying patients at risk of early graft dysfunction.
Carbonyl-functionalized mesoporous silicas have been synthesized by co-condensation of tetraethox... more Carbonyl-functionalized mesoporous silicas have been synthesized by co-condensation of tetraethoxysilane and varying contents of 3-(trimethoxysilyl)propyl methacrylate in acidic medium with the block copolymer Pluronic 123 as a structure directing agent. The functionalized materials were characterized by PXRD, TEM, SEM, IR, and N 2 adsorption-desorption at 77 K. Adsorption of phenol in aqueous solution on the materials has been investigated. The experimental results showed that carbonyl-functionalized mesoporous silicas possess strong adsorption ability for phenol with interaction of O-H…O = C hydrogen bond. The adsorption data are fitted to Langmuir Isotherms and a maximum adsorption capacity calculated from the Langmuir equation can reach 0.87 mmol of phenol/g. The effect of the pH on phenol adsorption has been studied.
Abstract Thiol-functionalized mesoporous silicas have been synthesized by co-condensation of tetr... more Abstract Thiol-functionalized mesoporous silicas have been synthesized by co-condensation of tetraethoxysilane and varying contents of 3-mercaptopropyltrimethoxysilane in acidic medium with the block copolymer Pluronic 123 as a structure directing agent. ...
This paper presents a pilot-aided channel estimation method which is particularly suitable for mo... more This paper presents a pilot-aided channel estimation method which is particularly suitable for mobile WiMAX 802.16e Downlink Partial Usage of Subchannel mode. Based on this mode, several commonly used channel estimation methods are studied and the method of least squares line fitting is proposed. As data of users are distributed onto permuted clusters of subcarriers in the transmitted OFDMA symbol, the proposed channel estimation method utilizes these advantages to provide better performance than conventional approaches while offering remarkably low complexity in practical implementation. Simulation results with different ITU-channels for mobile environments show that depending on situations, enhancement of 5 dB or more in term of SNR can be achieved.
TÓM TẮT: Nghiên cứu này xem xét mối quan hệ giữa chất lượng dịch vụ siêu thị, sự thỏa mãn và lòng... more TÓM TẮT: Nghiên cứu này xem xét mối quan hệ giữa chất lượng dịch vụ siêu thị, sự thỏa mãn và lòng trung thành của người tiêu dùng đối với siêu thị. Các mối quan hệ này được kiểm định với 318 khách hàng tại siêu thị ở TPHCM. Kết quả nghiên cứu cho thấy chất ...
Cuộc cách mạng công nghiệp 4.0 đang có tác động mạnh mẽ đến các nước trên thế giới ở nhiều lĩnh v... more Cuộc cách mạng công nghiệp 4.0 đang có tác động mạnh mẽ đến các nước trên thế giới ở nhiều lĩnh vực như cơ cấu ngành nghề, nhu cầu nguồn nhân lực, hệ thống quản trị sản xuất, ... Giao thông vận tải là ngành có tính cộng đồng hóa rất cao nên cũng sẽ chịu tác động mạnh mẽ của cuộc cách mạng công nghiệp này. Những thành tựu của cách mạng công nghiệp 4.0 có thể tái định hình lại hệ thống giao thông vận tải của các quốc gia. Điều đó đặt ra thách thức cho các nhà quản lý vận tải phải thay đổi mô hình hoạt động cũng như những chính sách liên quan đến vận tải. Bài viết trình bày tổng quan về cách mạng công nghiệp 4.0 và những khía cạnh chính của ngành giao thông vận tải đang chịu tác động của cách mạng công nghiệp 4.0
Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2019
Phát triển ngành nông nghiệp công nghệ cao là xu thế tất yếu của sản xuất nông nghiệp Việt Nam nó... more Phát triển ngành nông nghiệp công nghệ cao là xu thế tất yếu của sản xuất nông nghiệp Việt Nam nói chung và của tỉnh Thái Nguyên nói riêng. Thái Nguyên là tỉnh trung tâm của vùng Trung du và Miền núi phía Bắc, có điều kiện tự nhiên và tài nguyên thiên nhiên phong phú để phát triển kinh tế, đặc biệt là phát triển ngành nông nghiệp. Tuy nhiên, để ngành này phát triển bền vững, ngoài tiến bộ khoa học công nghệ thì nguồn nhân lực đủ khả năng ứng dụng thành tựu khoa học công nghệ vào sản xuất nông nghiệp là một yếu tố quan trọng. Bài viết đánh giá chung về thực trạng nguồn nhân lực ở Thái Nguyên và đề xuất một số giải pháp để tăng số lượng và nâng cao chất lượng nguồn nhân lực hướng tới phát triển nông nghiệp công nghệ cao.
Introduction: COPD is serious public health problem in over the world. In Vietnam, the prevalence... more Introduction: COPD is serious public health problem in over the world. In Vietnam, the prevalence of COPD is 4.2% of the general population. Since December 2010, program for COPD and asthma management is incorporated in the national program against non-communicable diseases. Objectives: To determine the knowledge, attitude and practices (KAP) regarding to diagnosis and management of COPD among doctors in hospitals of 10 cities and provinces in the Northern Vietnam. Methods: A standardized questionnaire was completed by 461 doctors to assess their KAP in diagnostic and management of COPD before their participation in training course from June to December 2012. Results: Among 461 respondents, there were 66.8% doctors who work in the province/city hospitals and 33.2% doctors in the district hospitals. Majority of doctors did not fully understand the risk factors of the disease; the most important risk factor for COPD were cigarette smoke (89.8% of the doctor), followed by biomass smoke and dust (51.5%), respiratory infections (38.5%), gene factor (16.3%), abnormalites in lung (9.1%), socio – economic factors (5.0%). Only 43.9% of doctors were able to list the 4 criteria to diagnose COPD and only 23.5% of doctors had the correct answer for the staging of COPD according GOLD 2011. Results showed that only 14.3 % of doctors guided patients to use the drug delivery devices in the prescription. Conclusion: Our results revealed that, there is lack of awareness and urgent need of education on diagnosis and management of COPD for Vietnamese doctors.
Paclitaxel is one of the most effective chemotherapeutic agents for treating various types of can... more Paclitaxel is one of the most effective chemotherapeutic agents for treating various types of cancer. However, the clinical application of paclitaxel in cancer treatment is considerably limited due to its poor water solubility and low therapeutic index. Thus, it requires an urgent solution to improve therapeutic efficacy of paclitaxel. In this study, folate decorated paclitaxel loaded PLA-TPGS nanoparticles were prepared by a modified emulsification/solvent evaporation method. The obtained nanoparticles were characterized by Field Emission Scanning Electron Microscopy (FESEM), Fourier Transform Infrared (FTIR) and Dynamic Light Scattering (DLS) method. The spherical nanoparticles were around 50 nm in size with a narrow size distribution. Targeting effect of nanoparticles was investigated in vitro on cancer cell line and in vivo on tumor bearing nude mouse. The results indicated the effective targeting of folate decorated paclitaxel loaded copolymer nanoparticles on cancer cells both in vitro and in vivo.
Although economic reform has brought remarkable progress in poverty reduction in Vietnam, the sca... more Although economic reform has brought remarkable progress in poverty reduction in Vietnam, the scale and depth of ethnic minority poverty in Vietnam presents one of the major challenges to achieving the targets for poverty reduction set out in the SocioEconomic Development Plan, as well as the Millennium Development Goals. We first review a series of monetary and non-monetary indicators which show the living standards of the ethnic minorities are improving but still lag seriously behind those of the majority Kinh-Hoa. The minorities' lower living standards result from the complex interplay of overlapping disadvantages, which start in utero and continue until adult life. Next an analysis of the drivers of the ethnic gap, in terms of both differences in characteristics and differences in returns to those characteristics, is undertaken. Mean and quantile decompositions show that at least a half of the gap in per capita expenditure can be attributed to the lower returns to characteristics that the ethnic minorities receive. The reasons underlying such differences in returns are discussed, drawing on both quantitative analysis and the large number of qualitative studies on ethnic issues in Vietnam. Finally, some of the short and longer term policy measures which we believe could help to counter ethnic disadvantages in the nutrition, education and employment sectors are discussed. We also emphasize the importance of promoting growth that is geographically broad and socially inclusive − without which, the current disparities between the Kinh-Hoa and the ethnic minorities will continue to grow.
2011 7th International Wireless Communications and Mobile Computing Conference, 2011
Network coverage is one of the most decisive factors for determining the efficiency of a wireless... more Network coverage is one of the most decisive factors for determining the efficiency of a wireless sensor network. However, in dangerous or hostile environments such as battle fields or active volcano areas, we can neither deterministically or purposely deploy sensors as desired, thus the emergence of coverage holes (the unmonitored areas) is unavoidable. In addition, the introduction of new coverage holes during network operation due to sensor failures due to energy depletion shall significantly reduce coverage efficacy. Therefore, we need to either remotely control or set up a protocol to heal them as soon as possible in an automated fashion. In this paper, we focus on how to schedule mobile sensors in order to cope with coverage hole issues in a hybrid sensor network containing both static and mobile sensors. To this end, we introduce a new metric, namely to maximize the minimum remaining energy of all moved sensor since the more energy remains, the longer the network can operate. Based on this metric, we propose an efficient coverage healing algorithm that always determines an optimal location for each mobile sensor in order to heal all coverage holes, after all mobile sensors locations and coverage holes are located. Simulation results confirm the efficiency and utilization of our proposed method.
Background. The goal of this study was to determine whether the production of posttransplant anti... more Background. The goal of this study was to determine whether the production of posttransplant antibodies directed against donor HLA mismatches (donor specific antibody; DSA) is associated with renal allograft rejection and early graft dysfunction. Methods. Forty-nine adult renal allograft recipients with increased risk of rejection were enrolled during the period of October 2001 through May 2003 and were prospectively monitored for the development of anti-HLA antibodies. Results. Of 49 patients, eight (16.3 %) patients were diagnosed with acute humoral rejection (AHR) and 11/49 (22.4%) patients were diagnosed with acute cellular rejection (ACR). A strong association between pretransplant HLA sensitization and AHR was found (Pϭ0.005). Of the eight patients diagnosed with AHR, the majority developed DSA before or concomitant with episodes of rejection (PϽ0.001). Only 3 of 41 patients (7.3%) without AHR developed DSA. The pathogenic role of alloantibodies was further substantiated by analyzing their association with graft function as measured by serum creatinine levels. The average serum creatinine after the third month posttransplantation in DSA producers was 2.24Ϯ1.01 mg/dL, while in non-DSA patients the average serum creatinine was 1.41Ϯ0.37 mg/dL (PϽ0.01). Conclusion. This study reveals a strong association between the production of DSA, AHR, and early graft dysfunction. Our findings indicate that prospective monitoring for anti-HLA antibodies following transplantation is a useful test for the diagnosis and classification of AHR for identifying patients at risk of early graft dysfunction.
Carbonyl-functionalized mesoporous silicas have been synthesized by co-condensation of tetraethox... more Carbonyl-functionalized mesoporous silicas have been synthesized by co-condensation of tetraethoxysilane and varying contents of 3-(trimethoxysilyl)propyl methacrylate in acidic medium with the block copolymer Pluronic 123 as a structure directing agent. The functionalized materials were characterized by PXRD, TEM, SEM, IR, and N 2 adsorption-desorption at 77 K. Adsorption of phenol in aqueous solution on the materials has been investigated. The experimental results showed that carbonyl-functionalized mesoporous silicas possess strong adsorption ability for phenol with interaction of O-H…O = C hydrogen bond. The adsorption data are fitted to Langmuir Isotherms and a maximum adsorption capacity calculated from the Langmuir equation can reach 0.87 mmol of phenol/g. The effect of the pH on phenol adsorption has been studied.
Abstract Thiol-functionalized mesoporous silicas have been synthesized by co-condensation of tetr... more Abstract Thiol-functionalized mesoporous silicas have been synthesized by co-condensation of tetraethoxysilane and varying contents of 3-mercaptopropyltrimethoxysilane in acidic medium with the block copolymer Pluronic 123 as a structure directing agent. ...
This paper presents a pilot-aided channel estimation method which is particularly suitable for mo... more This paper presents a pilot-aided channel estimation method which is particularly suitable for mobile WiMAX 802.16e Downlink Partial Usage of Subchannel mode. Based on this mode, several commonly used channel estimation methods are studied and the method of least squares line fitting is proposed. As data of users are distributed onto permuted clusters of subcarriers in the transmitted OFDMA symbol, the proposed channel estimation method utilizes these advantages to provide better performance than conventional approaches while offering remarkably low complexity in practical implementation. Simulation results with different ITU-channels for mobile environments show that depending on situations, enhancement of 5 dB or more in term of SNR can be achieved.
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