An Approach to $\epsilon$-duality Theorems for Nonconvex Semi-infinite Multiobjective Optimization Problems

Kim, Do Sang,Son, Ta Quang Mathematical Society of the Republic of China (Tai 2018 Taiwanese journal of mathematics Vol.22 No.5

Some new properties of the Lagrange function and its applications

Kim, Do Sang,Son, Ta Quang Springer (Biomed Central Ltd.) 2012 Fixed point theory and applications Vol.2012 No.1

First Report on Multidrug-Resistant Methicillin-Resistant Staphylococcus aureus Isolates in Children Admitted to Tertiary Hospitals in Vietnam

( Nguyen Thai Son ),( Vu Thi Thu Huong ),( Vu Thi Kim Lien ),( Do Thi Quynh Nga ),( Tran Thi Hai Au ),( Tang Thi Nga ),( Le Nguyen Minh Hoa ),( Tran Quang Binh ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.9

The extensive distribution of multidrug-resistant (MDR) methicillin-resistant Staphylococcus aureus (MRSA) poses a threat to healthcare worldwide. This study aimed to investigate the MDR and molecular patterns of MRSA isolates in children admitted to the two biggest tertiary care pediatric hospitals in northern and southern Vietnam. A total of 168 MRSA strains were collected to determine antibiotic susceptibility by minimum inhibitory concentration tests. Antibiotic-resistant genes, pulsed-field gel electrophoresis, staphylococcal cassette chromosome mec (SCCmec) typing, and multilocus sequence typing were used for the molecular characterization of MRSA. Among the total strains, the MDR rate (51.8%) was significantly higher in the northern hospital than in the southern hospital (73% vs. 39%, p < 0.0001). The MDR-MRSA with the highest rates were “ciprofloxacin-erythromycin-gentamicin-tetracyclines” (35.6%), followed by “erythromycin-tetracycline-chloramphenicol” (24.1%), and “ciprofloxacin-erythromycin-gentamicin” (19.5%), showing an accumulative total of 79.3%. The most susceptible antibiotics were rifampicin (100%) and vancomycin (100%), followed by doxycycline (94.0%), meropenem (78.0%), and cefotaxime (75.0%). The SCCmecII strains showed greater resistance to gentamicin, ciprofloxacin, tetracycline, meropenem and cephalosporins compared with the other strains. The SCCmecII strains exhibited the highest rate in the tested genes (aacA/aphD: 55.2%, ermA/B/C: 89.7%, and tetK/M: 82.8%). ST5-SCCmecII was the predominant clone in the northern hospital, whereas SCCmecIVa was more pronounced in the southern hospital. In conclusion, our results raised concerns about the predominant MDR-MRSA strains in the pediatric hospitals in Vietnam. The north-south difference in the antibiotic resistance patterns and genetic structure of MRSA suggests different MRSA origins and various uses of antimicrobial agents between the two regions.

Amblovenatum immersum (Thelypteridaceae): A new record for the flora of Vietnam

Doan Hoang SON,Do Van HAI,Bui Hong QUANG,La Anh DUONG,Trinh Van HIEU,Ritesh Kumar CHOUDHARY,이중구 한국식물분류학회 2022 식물 분류학회지 Vol.52 No.2

Amblovenatum immersum (Blume) Mazumdar (Thelypteridaceae) is newly recorded in Vietnam. It is similar to A. terminans (Panigrahi) J. P. Roux in its woody rhizome and cristate spores but differs in terms of its plant size, lobed pinnae, lobed segments, veinlets, sori and indusia. It was previously found to exist in China, India, Indonesia, Malaysia, Myanmar, Philippines, Sri Lanka, and Thailand as well as in east Africa, tropical America, northern Australia and Micronesia. The present study provides a detailed description, photos, and line drawing of the species. Furthermore, a comparison of the diagnostic characters with the closely related species in Vietnam A. terminans is provided.

Influences of Protestantism on some Traditional Cultural Values of Hmong Ethnic People in Lao Cai Province of Vietnam

NGUYEN Van Hieu,DO Quang Son 부산외국어대학교 아세안연구원 2009 Suvannabhumi Vol.1 No.2

베트남 소수민족 공동체 중 Hmong족은 중요한 구성원이라고 여겨져 왔다. 타지에서 베트남으로 이민 와서 다른 민족들과 함께 오랫동안 살아 왔지만 Hmong족은 자기의 민족문화 특색을 잘 지켜왔다. 그런데 지난 몇 년 동안 전통적인 종교와 달리 새로운 종교를 믿게 되는 방향으로 Hmong족의 심령의 종교는 많이 변하고 있다. 그 중에특히 주목받은 것은 개신교의 유입이다. 개신교는 직접적, 간접적 선교 방법으로 Lao Cai에 있는 Hmong족 공동체에 자연스럽게 유입되었다. Lao Cai의 많은 지방에서 사람들이 개신교를 믿게 되었고 그 중에는 가족이나 종족 환경에서 강제적 선교도 일어났다. 개신교는Hmong족의 전통문화뿐만 아니라 Hmong족의 전통 종교, 신앙에도직접적으로 영향을 주었다. 이 글에서는 Hmong족이 살고 있는 Lao Cai 지방을 선택하여 고찰하며 Hmong족의 전통문화가치에 대한 개신교의 영향 및 원인을살펴보기로 한다. 먼저 Hmong사람들은 전통신앙을 버리고 개신교를믿게 되는 원인을 살펴보자. 주 원인은 다음과 같은 네 가지가 있다고본다. -경제와 관련된 원인-성별 불평등과 관련된 원인-학문 수준과 정보 습득 희망과 관련된 원인-전통문화, 심리와 민속의식과 관련된 원인그리고 다음과 같은 두 가지 각도에서 전통문화 가치에 대한 영향을 알아보았다. 첫째는 개신교가 Hmong사람의 전통사회체제에 큰영향을 준 점, 둘째는 개신교가 Hmong사람의 풍속습관 및 전통 신앙에 영향을 준 점이다. 개신교가 Hmong사람의 전통사회체제에 큰 영향을 준 점은 여러방면에서 보인다. 전통적인 가치와 개신교의 새로운 규정 사이의 충돌도 있고 가족 안에서 부부의 위치상 충돌도 있다. 또한 Hmong사람들에게 전통 종족의 역할, 위치를 약화시키는 영향도 주었고 산골 마을에서 개신교를 믿는 사람들과 믿지 않은 사람들 사이에 일어난 새로운충돌도 있다개신교와 개신교의 교리는 역시 풍속습관과 전통신앙에 큰 영향을주었다. 첫째는 예수의 역할이 가장 중요하고 조상 숭배나 “집에 있는귀신 숭배”같은 것보다 강력한 것이다. 그래서 Hmong사람의 신앙, 종교는 원시적 다신교부터 일신교로 변한 것으로 보인다. 둘째는 개신교를 믿는 사람들이 Hmong족의 전통 민속축제를 점차 멀리한다. 어떤경우에는 그 사람들이 자기 민족의 전통문화 환경을 떠나 버리는 일도있었다. 셋째는 개신교의 교리가 Hmong족의 풍속 규정을 바꾸게 하였고 Hmong사람들이 새로운 종교의 교리를 집행시켰다. 넷째는 인간인생 주기에 관한 풍속습관 및 민속의례들은 의례 대상보다 의례 주제를 중심으로 삼는 것으로 점차 변화했다. 대체로 개신교가 Hmong족 공동체에 유입하여 이 민족의 전통문화가치는 변화했다. Hmong족 공동체에 오래 존재해 왔던 낙후한 습관을개선하는 점에서 개신교는 적극적 역할을 했다. 현재 문제점은 어떻게전통문화가치를 유지하고 새로운 종교와 같이 존재할 수 있느냐라는문제이다. 이 문제는 다음 연구 대상이 될 것이다.

Argyreia gyrobracteata Traiperm & Chitchak (Convolvulaceae): A new record to the flora of Vietnam

Binh Duc TRAN,Bach The TRAN,Do Van Hai,Quang Hong BUI,Son Hoang DOAN,Han Ngoc LE,Thuy Thu NGUYEN,엄상미 한국식물분류학회 2020 식물 분류학회지 Vol.50 No.3

Argyreia gyrobracteata Traiperm & Chitchak (Convolvulaceae) is newly recorded in Vietnam. It is similar to A. mekongensis Gagnep & Courch in having a white campanulate corolla but differs from that species by having whitish surface of the abaxial leaf, narrowly lanceolate or linear-oblong, curly, rolled up the bract with a longer length of the petiole and a shorter pedicel. It was previously known only in Thailand, but was recently found in Lam Dong Province, Vietnam, for the first time. The present study provides a detailed description, colorful photos and the distribution of the species. Furthermore, a comparison of the diagnostic characters between this species and a related species in Vietnam, A. mekongensis Gagnep & Courch, is provided.

First-Principles Investigation on the Electromechanical Properties of Monolayer 1H Pb-Dichalcogenides

Nguyen Hoang Linh,Nguyen Minh Son,Tran The Quang,Nguyen Van Hoi,Vuong Thanh,Do Van Truong Materials Research Society of Korea 2023 한국재료학회지 Vol.33 No.5

This study uses first-principles calculations to investigate the mechanical properties and effect of strain on the electronic properties of the 2D material 1H-PbX₂ (X: S, Se). Firstly, the stability of the 1H Pb-dichalcogenide structures was evaluated using Born's criteria. The obtained results show that the 1H-PbS₂ material possesses the greatest ideal strength of 3.48 N/m, with 3.68 N/m for 1H-PbSe₂ in biaxial strain. In addition, 1H-PbS₂ and 1H-PbSe₂ are direct semiconductors at equilibrium with band gaps of 2.30 eV and 1.90 eV, respectively. The band gap was investigated and remained almost unchanged under the strain ε_xx but altered significantly at strains ε_yy and ε_bia. At the fracture strain in the biaxial direction (19 %), the band gap of 1H-PbS₂ decreases about 60 %, and that of 1H-PbSe₂ decreases about 50 %. 1H-PbS₂ and 1H-PbSe₂ can convert from direct to indirect semiconductor under the strain ε_yy. Our findings reveal that the two structures have significant potential for application in nanoelectronic devices.

Parenchymal-sparing anatomical hepatectomy based on portal ramification of the right anterior section: A prospective multicenter experience with short-term outcomes

Truong Giang Nguyen,Thanh Khiem Nguyen,Ham Hoi Nguyen,Hong Son Trinh,Tuan Hiep Luong,Minh Trong Nguyen,Van Duy Le,Hai Dang Do,Kieu Hung Nguyen,Van Minh Do,Quang Huy Tran,Cuong Thinh Nguyen 한국간담췌외과학회 2024 Annals of hepato-biliary-pancreatic surgery Vol.28 No.1

Backgrounds/Aims: Parenchymal-sparing anatomical hepatectomy (Ps–AH) based on portal ramification of the right anterior section (RAS) is a new technique to avoid unnecessarily transecting too much liver parenchyma, especially in cases of major anatomical hepatectomy. Methods: We prospectively assessed 26 patients with primary hepatic malignancies having undergone major Ps–AH based on portal ramification of the RAS from August 2018 to August 2022 (48 months). The perioperative indications, clinical data, intra-operative index, pathological postoperative specimens, postoperative complications, and follow-up results were retrospectively evaluated. Results: Among the 26 patients analyzed, there was just one case that had intrahepatic cholangiocarcinoma The preoperative level of α– Fetoprotein was 25.2 ng/mL. All cases (100%) had Child–Pugh A liver function preoperatively. The ventral/dorsal RAS was preserved in 19 and 7 patients, respectively. The mean surgical margin was 6.2 mm. The mean surgical time was 228.5 minutes, while the mean blood loss was 255 mL. In pathology, 5 cases (19.2%) had microvascular invasion, and in the group of HCC patients, 92% of all cases had moderate or poor tumor differentiation. Six cases (23.1%) of postoperative complications were graded over III according to the Clavien–Dindo system, including in three patients resistant ascites or intra-abdominal abscess that required intervention. Conclusions: Parenchymal-sparing anatomical hepatectomy based on portal ramification of the RAS to achieve R0-resection was safe and effective, with favorable short-term outcomes. This technique can be used widely in clinical practice.

Pancreaticoduodenectomy with superior mesenteric artery first-approach combined total meso-pancreas excision for periampullary malignancies: A high-volume single-center experience with short-term outcomes

Thanh Khiem Nguyen,Ham Hoi Nguyen,Tuan Hiep Luong,Kim Khue Dang,Van Duy Le,Duc Dung Tran,Van Minh Do,Hong Quang Pham,Hoan My Pham,Thi Lan Tran,Cuong Thinh Nguyen,Hong Son Trinh,Yosuke Inoue 한국간담췌외과학회 2024 Annals of hepato-biliary-pancreatic surgery Vol.28 No.1

Backgrounds/Aims: Pancreaticoduodenectomy (PD) is the only radical treatment for periampullary malignancies. Superior mesenteric artery (SMA) first approach combined with total meso-pancreas (MP) excision was conducted to improve the oncological results. There has not been any previous research of a technique that combines the SMA first approach and total MP excision with a detailed description of the MP macroscopical shape. Methods: We prospectively assessed 77 patients with periampullary malignancies between October 2020 and March 2022 (18 months). All patients had undergone PD with SMA first approach combined total MP excision. The perioperative indications, clinical data, intra-operative index, R0 resection rate of postoperative pathological specimens (especially mesopancreatic margin), postoperative complications, and follow-up results were evaluated. Results: The median operative time was 289.6 min (178−540 min), the median intraoperative blood loss was 209 mL (30−1,600 mL). Microscopically, there were 19 (24.7%) cases with metastatic MP, and five cases (6.5%) with R1-resection of the MP. The number of lymph nodes (LNs) harvested and metastatic LNs were 27.2 (maximum was 74) and 1.8 (maximum was 16), respectively. Some (46.8%) patients had pancreatic fistula, but mostly in grade A, with 7 patients (9.1%) who required re-operations. Some 18.2% of cases developed postoperative refractory diarrhea. The rate of in-hospital mortality was 1.3%. Conclusions: The PD with SMA first approach combined TMpE for periampullary malignancies was effective in achieving superior oncological statistics (rate of MP R0-resection and number of total resected LNs) with non-inferior short-term outcomes. It is necessary to evaluate survival outcomes with long-term follow-up.