http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Extension of General Convergence Framework with Significant Samples
Nguyen Ha Vo,Yonggwan Won 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Single Class Classification is the problem of distinguishing one class of data (called positive class) from the universal set of multiple classes (negative class). In this paper, we proposed an improvement of Extended General Mapping Convergence framework using extreme learning machine, a recently developed machine learning algorithm. This proposed method keeping the high accuracy in classification while improving the high speed of old method.
Van-Truc Nguyen,Thanh-Binh Nguyen,Thi-Dieu-Hien Vo,Nguyen Duy Dat,Thi-Kim Quyen Vo,Xuan Cuong Nguyen,Viet-Cuong Dinh,Thi-Ngoc-Chau Le,Thi-Giang-Huong Duong,Manh-Ha Bui,Xuan-Thanh Bui 대한환경공학회 2023 Environmental Engineering Research Vol.29 No.3
This study explores the adsorption of doxycycline (DOX) from aqueous solutions onto biochar derived from banana peel, which was prepared using a potassium hydroxide activation method (KOH-BPB). The biochar properties were characterized based on morphology, surface area (SBET of 710.241 ㎡ g<SUP>−1</SUP>), functional groups, and surface charge (pHPZC = 7.7). Parameters, including initial pH, DOX concentration, and ionic strength, that influenced the DOX adsorption capacity of KOH-BPB were examined. Adsorption equilibrium of DOX on KOH-BPB was assessed through four isothermal models: the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models. The obtained data were most compatible with the Langmuir model (R² = 0.9879). KOH-BPB has a maximum DOX absorption capacity of 121.95 mg g<SUP>-1</SUP> which exceeds that of many comparable absorbents. The maximum DOX removal was 96.7% at pH 6, a DOX concentration of 20 mg L<SUP>-1</SUP>, and a KOH-BPB dose of 1.0g L<SUP>-1</SUP>. These findings reveal that biochar from banana peel effectively removes antibiotic residues from water. This study provides a potential, low-cost, and environmentally friendly adsorbent.
Highly efficient adsorption of arsenite from aqueous by zirconia modified activated carbon
Pham Ngoc Chuc,Nguyen Quang Bac,Dao Thi Phuong Thao,Nguyen Trung Kien,Nguyen Thi Ha Chi,Nguyen Van Noi,Vo Thang Nguyen,Nguyen Thi Hong Bich,Dao Ngoc Nhiem,Dinh Quang Khieu 대한환경공학회 2024 Environmental Engineering Research Vol.29 No.2
Nguyen Dinh HOA,Vu Duc-Dat,Doan Thi-Ngoc-Ha,Vo Hoang-Long 대한정형외과학회 2020 Clinics in Orthopedic Surgery Vol.12 No.2
Background: The evidence for the efficacy and safety of balloon kyphoplasty (BKP) in treating the Vietnamese patients is sparse. There is no convincing evidence regarding BKP’s efficacy in Vietnamese patients, especially in the patients with thoracic osteoporotic vertebral compression fractures (VCFs). This article aims to evaluate the outcomes of restoring the body height of the compressed thoracic vertebrae in patients undergoing BKP. Methods: We prospectively enrolled 65 consecutive patients with thoracic VCFs (73 vertebrae) due to osteoporosis who were treated with BKP between June 2018 and May 2019. Results: A trocar was inserted through the pedicle in 84.9% (62/73) and beside the pedicle in 15.1% (11/73). The mean amount of mixed cement injected was 4.1 ± 1.1 mL (range, 1.5–7 mL). Cement leakage was radiographically confirmed in 30.8% of 65 patients. Among patients with complications caused by cement extravasation, the leakage was through the anterior margin of the vertebrae in 15.4%, through the vertebral disc in 12.3%, and through the posterior margin of the vertebrae in 3.1%. In the last 3.1% of patients, there was no clinically notable lesions of the nerve roots or spinal cord. The mean visual analog scale score decreased significantly from 7.3 ± 1.1 preoperatively to 3.3 ± 0.6 at 24 hours after surgery, and then to 1.2 ± 1.1 at 3 months after surgery (p < 0.01). The mean reduction in Cobb angle measured on standing radiographs after treatment was 3.7°, showing statistical significance (p < 0.01). Conclusions: BKP is a minimally invasive treatment effective for immediate pain relief, early motor rehabilitation, and humpback correction. The present study provided convincing evidence to support the use of BKP by spine surgeons and clinical specialists in treating osteoporotic thoracic VCFs in Vietnamese patients.
Critical Factors of Subcontractor Evaluation and Selection: A Case Study in Vietnam
VO, Khoa Dang,PHAM, Cuong Phu,PHAN, Phuong Thanh,VU, Ngoc Bich,DUONG, My Tien Ha,LE, Loan Phuc,NGUYEN, Quyen Le Hoang Thuy To Korea Distribution Science Association 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.3
A contractor or a main contractor is a company with full capacity to construct all project's works for the owner. A subcontractor is an organization that works with the main contractor to execute and complete work packages for the project. Selecting an effective subcontractor will help the efficiency and success of any projects in the construction industry. Therefore, this study identified subcontractor evaluation factors in Vietnam by collecting questionnaire survey data from engineers and staffs in the construction industry project environment. An exploratory factor analysis (EFA) was then performed to identify the critical factors when evaluating and selecting the subcontractor in construction projects. Moreover, when considering the impact level in terms of the average value, the research results showed that the most critical concern was the subcontractor's reputation. Furthermore, the top five factors affecting the sub-contractor evaluation and selection are (i) reputation, (ii) price, (iii) construction techniques, (iv) ability to implement projects according to commitments, and (v) subcontractor competence (the team of workers, technician staff, engineers with full capacity according to regulations). These research results provide an overall perspective that will help main contractors develop suitable subcontractors' evaluation and selection factors in their projects in the construction industry.
First Report of Lasiodiplodia theobromae Causing Gummosis on Citrus grandis (L.) Osbeck in Vietnam
Vo Thi Ngoc Trai,Tran Thi Thu Ha,Nguyen Bao Hung The Korean Society of Plant Pathology 2024 식물병연구 Vol.30 No.1
This study aims to isolate and identify the fungal pathogen responsible for gummosis disease affecting Thanh Tra pomelo in Vietnam. Through molecular identification utilizing primer pairs ITS5 and ITS4, the analysis pinpointed Lasiodiplodia theobromae as the specific fungal pathogen. Notably, the fungal colonies exhibited vigorous growth on potato dextrose agar. Initially, these colonies appeared whitish-grey, transforming into a black-grey hue within 5-7 days at a temperature of 30℃. According to previous reports, Phytophthora spp. was the most common pathogenic genus causing gummosis on Thanh Tra pomelo in Vietnam. To our knowledge, this is the first report on L. theobromae causing gummosis on Thanh Tra pomelo in Vietnam.
Methylation Profile of BRCA1, RASSF1A and ER in Vietnamese Women with Ovarian Cancer
Lan, Vo Thi Thuong,Thuan, Ta Bich,Thu, Doan Minh,Uyen, Nguyen Quynh,Ha, Ngo Thi,To, Ta Van Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.12
DNA methylation is considered a promising biomarkers for diagnosis of cancer in general and of ovarian cancer in particular. In our study, we validated the accuracy of methylation specific polymerase chain reaction (MSP) to analyze the methylation pattern of BRCA1, RASSF1A and ER in 59 and 10 Vietnamese patients with epithelial ovarian cancer (EOC) and benign ovarian tumors, respectively. We found methylation of BRCA1, RASSF1A and ER in 11/59 (18.6%), 40/59 (67.8%) and 15/59 (25.4%) of EOC cases, while methylation of BRCA1 was only detected in 2/10 (20%) benign ovarian patients. Forty five out of the 59 EOCs (78%) demonstrated methylation at one or more genes. The methylation frequency of RASSF1A was significantly associated with EOC (p<0.0005). No significant association was observed between methylation status of these genes and the clinical and pathological parameters of tumors collected from Vietnamese women suffering from ovarian cancer.
A Facile Synthesis of WS2/g-C3N4 Composites with Improved Photocatalytic Activity
Huu Ha Tran,Duy Huong Truong,Thanh Tam Truong,Thi Xuan Dieu Nguyen,Ying-Shi Jin,김성진,Vien Vo 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.8
Visible-light-driven photocatalysis has received considerable attention in the environmental treatment in recent years. In this paper, WS2/g-C3N4 composite photocatalysts with various contents of WS2 and g-C3N4 were synthesized by a facile method via heating the mixtures of tungstic acid and thiourea, and denoted as nWCN, where n is weight ratio of thiourea to tungstic acid. The composites were characterized by XRD, SEM, EDS, TEM, IR, Raman spectroscopy, XPS, TGA, and UV?vis DRS. The characterizations reveal that the composites contain WS2 nanosheets coated by g-C3N4 and the relative content of WS2 in the composites decreases with increasing amount of thiourea in the reaction mixtures. All the composites exhibited the better photocatalytic activity in degradation of methylene blue in aqueous solution than the single components, WS2, and g-C3N4. Among them, 7WCN sample performed the highest activity. A synergistic effect between WS2 and g-C3N4 in photocatalytic activity for the composites was observed.
Yen H. Vo,Thanh V. Le,Hieu D. Nguyen,Tuong A. To,Hiep Q. Ha,Anh T. Nguyen,Anh N.Q. Phan,Nam T.S. Phan 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
Zirconium-based metal-organic framework MOF-808 was synthesized, and sulfated with aqueous sulfuric acid. Sulfated MOF-808 was utilized as a recyclable heterogeneous catalyst for the synthesis of quinazolinones from β-ketoesters and benzamides, and for the synthesis of benzimidazoles from β-ketoesters and o-phenylenediamines in glycerol as a green solvent. The sulfated MOF-808 catalyst was more active than many heterogeneous and homogeneous catalysts. The combination of the sulfated MOF-808 and glycerol was also effective for the reaction of o-aminothiophenols with β-diketones or cyclic β-diketones to produce benzothiazoles. To our best knowledge, MOF-based catalysts were not previously utilized as heterogeneous catalyst in glycerol as green solvent.