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Vinh-Thanh Tran,Duc-Tri Do,Minh-Khai Nguyen,Dinh-Tuyen Nguyen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In this paper, a space vector pulse-width modulation (SVPWM) control scheme for the three-level quasi-switched boost T-type inverter (TL-qSBT2I) to reduce common mode is presented. The magnitude and slew rate of common-mode voltage (CMV) are reduced by using the proposed method. By properly selecting the shoot-through (ST) phase, the ST states are inserted within a small vector so that the active states and output voltage are unchanged. In this method, the ST duty cycle is kept constant to obtain the modulation index as high as possible while the duty cycles of the two additional switches are the control variables. The proposed method can mitigate the peak value of CMV up to 50% and the RMS value up to 35.3% as compared to the conventional SVPWM control method. To verify the operating principle of the TL-qSBT<SUP>2</SUP>I, the simulation and experimental results are shown.
Thanh Vinh Nguyen,Chain-Ing Thomas Shih 한국응용곤충학회 2011 Journal of Asia-Pacific Entomology Vol.14 No.4
Predation rates of Neoseiulus womersleyi and Euseius ovalis feeding on eggs, larvae, or protonymphs of Tetranychus urticae, Tetranychus kanzawai, or Oligonychus mangiferus were measured in a chamber at 25 °C. N. womersleyi immatures consumed 9.73 T. urticae eggs, 13.53 larvae, or 11.57 protonymphs, while gravid females consumed 12.13 T. urticae eggs, 14.37 larvae, or 12.07 protonymphs daily. Female N. womersleyi consumed a total of 218.12 T. urticae eggs, 260.85 larvae, or 222.33 protonymphs, while male N. womersleyi consumed a total of 96.39 T. urticae eggs, 112.23 larvae, or 99.65 protonymphs. When O. mangiferus larvae or protonymphs were offered to E. ovalis, immatures consumed 18.57 larvae or 17.47 protonymphs. Gravid females consumed 16.83 larvae or 12.83 protonymphs daily, with a total of 330.68 larvae or 252 protonymphs. Adult E. ovalis males consumed fewer O. mangiferus larvae (107.69) or protonymphs (91.51) than females. Conversion rate of predation to reproduce was expressed as “Food–reproduction exchange rate” of N. womersleyi was lower on T. urticae than on T. kanzawai. E. ovalis showed a higher food–reproduction exchange rate on O. mangiferus than on T. urticae. The results suggest that N. womersleyi and E. ovalis feed mainly on larvae and protonymphs rather than on the eggs of T. urticae, T. kanzawai, and O. mangiferus. We recommended using T. urticae eggs are suitable food for mass rearing for both N. womersleyi and E. ovalis.
Thanh Vinh Nguyen,Chain-Ing Thomas Shih 한국응용곤충학회 2010 Journal of Asia-Pacific Entomology Vol.13 No.4
The development of the predatory mites, Neoseiulus womersleyi (Schicha) and Euseius ovalis (Evans), feeding on four tetranychid mites (Tetranychus urticae, Tetranychus kanzawai, Oligonychus mangiferus, Panonychus citri), maize pollen or Chinese loofah pollen was studied at 25 °C. Immature stages of N. womersleyi feeding on T. urticae and T. kanzawai had shorter developmental duration (4.71 and 5.02 days for females, 4.77 and 5.19 days for males, respectively) than those feeding on other food sources. Immature stages of E. ovalis females feeding on O. mangiferus and T. urticae developed in 4.99 and 5.13 days, respectively, the shortest developmental duration measured. Immature stages of E. ovalis males feeding on O. mangiferus and T. urticae developed in 5.12 and 5.37 days, respectively. The longevity of N. womersleyi males (13.31 to 14.51 days) and females (17.67 to 21.81 days) feeding on T. urticae, T. kanzawai or maize pollen was longer than the longevity of N. womersleyi feeding on O. mangiferus, P. citri or loofah pollen. E. ovalis males (12.91 to 16.74 days) and females (16.24 to 23.77 days) feeding on O. mangiferus, T. urticae or maize pollen lived longer than E. ovalis males and females feeding on T. kanzawai, P. citri or loofah pollen.
[정보분석 서비스] 자질 선택과 군집 점수 최대화를 이용한 대체 클러스터링
Tao Thanh Vinh,이종혁 한국정보과학회 2012 정보과학회 컴퓨팅의 실제 논문지 Vol.18 No.9
본 논문은 자질 선택과 군집 점수 최대화를 이용하여 대체 클러스터를 찾는 방법론을 제안한다. 우선 대체 클러스터를 찾기 위하여 중요한 자질을 찾고, 분류된 자질을 기준으로 대상 데이터를 변환하였으며, 대체 클러스터의 분류 품질을 높이기 위하여 군집 점수를 최대화하는 알고리즘을 적용하였다. UCI 데이터를 사용하여 실험한 결과, 제안한 방법론이 JI와 DI를 기준으로 한 평가에서 가장 높은 성능을 보였다. 본 결과는 자질 선택과 군집 점수의 최대화가 대체 클러스터를 찾는데 유용하다는 것을 보여준다. We proposed a method for finding alternative clusterings of a dataset based on feature selection and direct maximization of clustering quality. We found the possible important features for the alternative clustering. We transformed the data using these features to make the original clustering not likely to be found while the alternative clustering is more likely to be found; we used a clustering algorithm that directly maximize the clustering quality so that the alternative clustering will be high quality. We tested our approach with some other approaches on our synthetic dataset, UCI datasets: Segmentation, Vehicle, Vowel, Ionosphere and Glass, and a textual dataset. Our approach was the most stable one as it resulted in the best JI and DI for most of the tests. Our results showed that feature selection and direct maximization of clustering quality are important for finding alternative clusterings.
Van Thanh, Nguyen,Jang, Hyun-Jae,Vinh, Le Ba,Linh, Kieu Thi Phuong,Huong, Phan Thi Thanh,Cuong, Nguyen Xuan,Nam, Nguyen Hoai,Van Minh, Chau,Kim, Young Ho,Yang, Seo Young Elsevier 2019 Bioorganic chemistry Vol.88 No.-
<P><B>Abstract</B></P> <P>In a search for anti-inflammatory activity in resources from Vietnamese mangroves, we found that a methanolic extract from the leaves of <I>Calophyllum inophyllum</I> (CIL) showed significant anti-inflammatory effects <I>in vitro</I>. Using various chromatographic techniques, we subsequently isolated 12 compounds (<B>1</B>–<B>12</B>) from a methanolic extract of CIL, including two novel compounds (<B>1</B>–<B>2</B>). The inhibitory effects of these compounds on lipopolysaccharide-induced nitric oxide (NO) production in RAW264.7 cells were also evaluated. Compound <B>1</B> significantly suppressed NO production (IC<SUB>50</SUB> = 2.44 ± 0.88 µM), the secretion of pro-inflammatory cytokines (including interleukin-1 beta and tumor necrosis factor alpha), and the expression of inducible nitric oxide synthase through downregulation of nuclear factor-kappa-B signaling cascades. These results suggest that <I>C. inophyllum</I> leaves might be a useful resource for the development of drugs for the treatment of inflammation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Twelve compounds were isolated from Vietnamese mangrove <I>Calophyllum inophyllum</I>. </LI> <LI> Two new compounds <B>1</B> and <B>2</B> were determined by spectroscopic methods. </LI> <LI> Compound <B>1</B> showed significant anti-inflammatory activity. </LI> <LI> These results suggested that <I>C. inophyllum</I> might useful as the anti-inflammation drug. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A Novel Approach for Finding Alternative Clusterings using Feature Selection
Tao Thanh Vinh,JongHyeok Lee 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.2C
We proposed a method for finding alternative clusterings of a dataset based on feature selection. We exploited the feature distance to find out the important features for data clusterings. We weighted the important features for the alternative clustering against those of the original one to make the alternative clustering is more likely to be found than the original clustering; but we still kept the other unimportant features so that data points stayed close to each other in terms of these features to reserve the quality. We tested our approach with six others on our synthetic dataset and UCI datasets: Segmentation, Vehicle, Vowel, Ionosphere and Glass. Our approach was the most stable one as it resulted in the best JI and DI for most of the tests. Our results showed that features are important for data clustering; this result is very useful in data mining based on data features.
Successful surgical interventions for a giant and complicated myoepithelial carcinoma: a case report
Quang Vinh Vu,Thanh Tuan Hoang,Van Anh Tran,Thanh-Hai Tong,Hong Ha Nguyen 대한두개안면성형외과학회 2024 Archives of Craniofacial Surgery Vol.25 No.4
Ethmoid myoepithelial carcinoma is a rare tumor, with only 14 cases reported to date. This report discusses the largest tumor of this type ever recorded in the ethmoid region. The tumor caused extensive damage to facial structures, complicating treatment. The patient’s age and comorbidities increased the risk of intraoperative bleeding, presenting challenges to the complete removal of the tumor and the reconstruction of the damaged structures. To reduce the risk of intraoperative hemorrhage, shorten the surgery time, and manage potential heartrelated complications, arterial embolization was performed using gelatin sponges and coils. Definitive surgery was then carried out using a skin flap and mucosal flap to successfully reconstruct the defect. Postoperative radiotherapy was deemed unnecessary. The patient recovered well, with a satisfactory aesthetic outcome. No recurrence was observed during a 3-year follow-up period.