Anatomical Proportions and Chemical and Amino Acid Composition of Common Shrimp Species in Central Vietnam

Ngoan, L.D.,Lindberg, J.E.,Ogle, B.,Thomke, S. Asian Australasian Association of Animal Productio 2000 Animal Bioscience Vol.13 No.10

This investigation was conducted to evaluate the shrimp flesh (SF) and shrimp by-product (SB) of the most abundant shrimp species (Metapenaeus affinis, Penaeus semisulcatus and Penaeus monodon) caught in Central Vietnam, with the emphasis on yield, gross and amino acid (AA) composition and effect of heat treatment. The results showed that the mean edible SF and SB (head and shells with tail) yields of the three shrimp species averaged 56.7 and 43.3%, respectively, of the total wet body weight, with the M. affinis generating the highest by-product yield (45.7%) and P. semisulcatus (40.6%) the lowest. Significant differences in dry matter (DM), crude protein (CP) and ash content were found between SF and SB. The DM content of SF (21.5%) was lower than of SB (24.9%) and the ash content (on a DM basis) of the SB in all shrimp species was more than three times that of the SF (p<0.05), whereas the CP content was almost twice as high in the SF as compared with the SB (p<0.05). The SB of the three species contained (on a DM basis) between 44.0 and 49.8% CP (p<0.05) and between 13.5 and 18.1% chitin (p<0.05). The Ca content of SB differed also between species (p<0.05). On average, the sum of AA in SB corresponded to 89.3% of the CP and essential AA accounted for about 50% of the total AA. The most abundant AA were arginine, aspartic and glutamic acids, which accounted for 33% of the total AA. Minor, but significant differences in some AA concentrations of SB between species were observed (p<0.05). With the exception of the DM and ether extract content, all other chemical constituents of entire shrimp, SF and SB were not significantly affected by heat treatment (p>0.05).

Facile synthesis of multifunctional Ag/Fe3O4-CS nanocomposites for antibacterial and hyperthermic applications

Ngoan Thi Nguyen,Dai Lam Tran,Duc Cuong Nguyen,Thai Loc Nguyen,Thi Cham Ba,Binh Hai Nguyen,Thi Duong Ba,Nam Hong Pham,Dzung Tuan Nguyen,Thai Hoa Tran,Gia Dien Pham 한국물리학회 2015 Current Applied Physics Vol.15 No.11

Nanocomposites containing two or more functional constituents are attractive candidates for advanced nanomaterials. In this study, multifunctional Ag/Fe3O4-CS nanocomposites were successfully prepared, using chitosan as a stabilizing and cross-linking agent. The as-synthesized nanocomposites were characterized by Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS), UVevisible spectrophotometer (UVeVis) and vibrating sample magnetometer (VSM). The results demonstrated that Ag/Fe3O4-CS composite nanoparticles (NPs) were composed of parent components, Fe3O4 and Ag NPs, which were uniformly dispersed in the chitosan matrix. The hybrid NPs exhibited strong antibacterial property against Pseudomonas aeruginosa. With high magnetization value (67 emu/g), the synthesized Ag/Fe3O4-CS composite can be easily separated or recycled in potential biomedical applications. Furthermore, the results showed that the multicomponent hybrid nanostructures appeared to be the promising material for local hyperthermia, which can be used as thermoseeds for localized hyperthermia treatment of cancers.

Ensiling Techniques for Shrimp By-Products and their Nutritive Value for Pigs

Ngoan, L.D.,An, L.V.,Ogle, B.,Lindberg, J.E. Asian Australasian Association of Animal Productio 2000 Animal Bioscience Vol.13 No.9

An experiment was performed to evaluate different methods for preserving shrimp by-products and to determine their chemical composition. In the first experiment three ratios of shrimp by-product (SBP) to molasses (6:1, 4:1 and 3:1, wet weight), and to cassava root meal (3:1, 2:1 and 1:1, wet weight of shrimp by-product and air-dry weight of cassava root meal) were investigated. The pH of the SBP ensiled with molasses at a ratio of 3:1, and with cassava root meal at a ratio of 1:1, decreased during the first week to below 4.5 and remained low up to day 56 of ensiling, whereas the pH of the mixtures with higher ratios of SBP remained above 7.0, and the material deteriorated rapidly. The dry matter decreased initially in all treatments but then increased slightly from day 28 in the treatment where shrimp by-product was ensiled with cassava root meal at a ratio of 1:1. The crude protein (CP) and ammonia-N $(NH_3-N)$ contents of the preserved shrimp by-product material ensiled with molasses at a ratio of 3:1 increased significantly one week after ensiling. The CP content then remained constant, while the $NH_3-N$ concentration continued to increase up to 56 days after ensiling. When SBP was ensiled with cassava root meal at a ratio of 1:1 the CP content of the silage increased significantly up to 21 days after ensiling and then decreased back to the original level after 56 days, whereas $NH_3-N$ increased markedly up to 14 days and then remained fairly constant up to 56 days. However, the $NH_3-N$ content was significantly higher when SBP was ensiled with cassava root meal than with molasses. A balance experiment was carried out, arranged as a double Latin-square and including 6 F1 (Large White ${\times}$ Mong Cai) castrates fed randomly one of three diets based on cassava root meal, rice bran, and fish meal (FM) or shrimp by-product ensiled with molasses (SBEMO) or with cassava root meal (SBECA) as the main protein source. Apparent organic matter and CP digestibilities were significantly (p<0.001) higher for the fish meal diet than for the two shrimp by-product diets, although CP digestibility in SBEMO and SBECA was similar (p>0.05). N-retention was significantly higher for the fish meal diet than for the SBEMO diet, which in turn was significantly higher than for the SBECA diet (p<0.01). It can be concluded that shrimp by-product can be preserved by ensiling with molasses at a ratio of 3:1 or with cassava root meal at a ratio of 1:1. Nutrient digestibility and N-retention of diets based on these shrimp by-product silages were lower than for similar diets based on fish meal, probably due to their high chitin content and inferior amino acid balance.

Effects of Replacing Fish Meal With Ensiled Shrimp By-Product on the Performance and Carcass Characteristics of Growing Pigs

Ngoan, Le Duc,Ogle, Brian,Lindberg, Jan Erik Asian Australasian Association of Animal Productio 2001 Animal Bioscience Vol.14 No.1

A feeding trial was conducted to evaluate the effects of replacing fish meal (FM) with ensiled shrimp by-product (ESB) in a cassava root meal and rice bran-based diet on the performance and carcass characteristics of growing pigs. Thirty six crossbred (Large White$\times$Mong Cai) pigs, with an average initial BW of 19.4 kg, were randomly allocated to one of three different dietary treatments in which the crude protein of the FM was replaced with 0, 50 or 100% ESB. The animals were fed restrictedly and at the end of the experiment at a BW of about 90 kg, 6 representative animals in each treatment group were slaughtered for carcass quality evaluation. Animal growth performance and daily feed intake were significantly reduced (p<0.05) by the inclusion of shrimp by-products in the diets, whereas feed conversion ratios and carcass measurements were not significantly affected (p>0.05). Daily weight gains of the pigs fed the 100% FM diet and 50% ESB diet were significantly (p<0.05) higher than those of pigs fed the 100% ESB diet. In conclusion, from an economical as well as performance point of view, ESB can replace 50% of the crude protein of FM in cassava root meal and rice bran-based diets for growing pigs with a low genetic growth potential.

A Novel Chitosan-Gossypol Based Nanocarrier for Anticancer Curcumin Drug Delivery

( Ngoan Thi Nguyen ),( Lam Dai Tran ),( Duong Quang Le ),( Dien Gia Pham ),( Phuc Xuan Nguyen ),( Jun Seo Park ),( Jae Kweon Park ) 한국키틴키토산학회 2012 한국키틴키토산학회지 Vol.17 No.2

Gossypol chitosan (GPCS) nanoparticles have been successfully synthesized at the size of 20-40 nm through amidation process to forming base shift of polymer chains of chitosan using gossypol as a crosslinking agent. Their structure was confirmed by Fourier Transformed Infra Red (FT-IR) spectra. Morphology, stability, loading and releasing efficiency of GPCS and Cur/GPCS (Cur stands for curcumin) were thoroughly investigated by Field Emission Scanning Electron Microscopy (FESEM), FT-IR, Ultra Violet-Visible spectrophotometry (UV-Vis) and High Resolve Photoluminescence System (HRPLS). The obtained nanocarrier exhibited an excellent solubility for Cur anticancer drug as well as high stability for in vitro studies. An intensive fluorescence, allowing drug monitor/delivery, was achieved. Drug release profile was also studied. GPCS, therefore, could be considered to be a potential drug carrier for therapeutic treatment.

Ileal and Total Tract Digestibility in Growing Pigs Fed Cassava Root Meal and Rice Bran Diets With Inclusion of Fish Meal and Fresh or Ensiled Shrimp By-Products

Ngoan, Le Duc,Lindberg, Jan Erik Asian Australasian Association of Animal Productio 2001 Animal Bioscience Vol.14 No.2

The digestibility of organic matter (OM), crude protein (CP), ether extract and amino acids of a cassava root meal and rice bran diet, without (Basal) and with inclusion of fish meal (FM) or fresh (FSB) or ensiled (ESB) shrimp by-product in growing pigs (Large White$\times$Mong Cai) fitted with post-valve T-caecum (PVTC) cannulas was studied in a $4{\times}4$ change-over experiment. Significantly higher ileal digestibility of OM in the basal and FM diets and lower ileal digestibility of CP in the basal and ESB diets were found (p<0.05). Total tract digestibilities of OM and CP of diet ESB were lower (p<0.05) than in the other diets. The apparent ileal digestibilities of most amino acids were higher (p<0.05) in diets FM, FSB and ESB than in the basal diet. There was no difference (p>0.05) in the ileal digestibility of individual amino acids between diets FM, FSB and ESB, except for threonine, alanine and glycine. The estimated apparent ileal digestibility of individual amino acids in ensiled shrimp by-product was lower (p<0.05) than in fresh shrimp by-product and fish meal. In conclusion, as a result of the reduced daily intake of the diets containing shrimp by-products and lower ileal and total tract digestibility of both fresh and ensiled shrimp by-products complete replacement of fish meal cannot be recommended. The ensiled shrimp by-product was inferior nutritionally compared with fresh shrimp by-product. However, lower daily feed intakes of both the FSB and ESB diets suggest that the replacement should only be made partially, in order not to reduce the overall performance.

Damage assessment of shear-type structures under varying mass effects

Do, Ngoan T.,Mei, Qipei,Gul, Mustafa Techno-Press 2019 Structural monitoring and maintenance Vol.6 No.3

This paper presents an improved time series based damage detection approach with experimental verifications for detection, localization, and quantification of damage in shear-type structures under varying mass effects using output-only vibration data. The proposed method can be very effective for automated monitoring of buildings to develop proactive maintenance strategies. In this method, Auto-Regressive Moving Average models with eXogenous inputs (ARMAX) are built to represent the dynamic relationship of different sensor clusters. The damage features are extracted based on the relative difference of the ARMAX model coefficients to identify the existence, location and severity of damage of stiffness and mass separately. The results from a laboratory-scale shear type structure show that different damage scenarios are revealed successfully using the approach. At the end of this paper, the methodology limitations are also discussed, especially when simultaneous occurrence of mass and stiffness damage at multiple locations.

Synthesis fluorescent magnetic nanoparticles in a microchannel using the La Mer process and the characterization of their properties

Nguyen, Thi Ngoan,Joen, Hyeong Jin,Kwon, Bong Hyeon,Kim, Hyeong Hoon,Tran, Dai Lam,Mortan, Karl,Go, Jeung Sang Springer-Verlag 2014 JOURNAL OF MATERIALS SCIENCE - Vol.49 No.13

미래현금흐름예측능력에 나타난 과세소득의 정보효과

당티응완 ( Thi Ngoan Dang ),변용희 ( Yong Hee?byun ),홍영은 ( Young Eun Hong ),김정군 ( Jeoung Kun Kim ) 한국세무회계학회 2013 세무회계연구 Vol.0 No.37

현재까지 기업의 회계이익과 과세소득의 차이에 포함된 정보효과에 대한 연구들은 다양하게 진행되어 왔으나 과세소득의 정보효과에 대한 연구는 아직 미흡한 실정이다. 이에 본 연구는 기업의 과세소득의 정보효과가 당해이익의 미래현금흐름예측능력에 미치는 영향을 살펴보는데 그 목적이 있다. 구체적으로, 첫째, 이익조정에 의한 회계이익과 과세소득의 양의 차이가 낮은 이익의 질을 신호하는 정보를 포함하고 있다면 당해이익이 미래현금흐름을 예측하는 능력이 떨어질 것으로 예상하며 둘째, 조세전략에 의한 회계이익과 과세소득의 양의 차이는 차기의 반전효과로 인해 현금흐름의 감소를 유발하기 때문에 당해 이익의 미래현금 흐름의 예측능력을 감소시킬 것으로 예상하여 이를 검증하였다. 회계이익과 과세소득의 차이는 박승식외(2006)의 계산방법을 이용하여 산출하였으며 조세전략을 측정하기 위해 Dyreng et al.(2008), 심충진(2011), 그리고 Wilkie and Limberg(1993)에서 제시한 측정치를 각각 순서대로 이용하였다. 분석결과, 예측한 대로 이익조정을 수반한 회계이익과 과세소득의 양(+)의 차이는 당해이익의 미래현금흐름 예측능력을 저하시키는 것으로 나타났으며 조세전략을 수반한 회계이익과 과세소득의 양의 차이는 당해이익의 미래현금흐름의 예측능력도 감소시키는 것으로 나타났다. 본 연구는 신용분석가들이나 재무분석가들이 회계이익을 분석함에 있어 과세소득의 추가적인 정보효과를 제공함으로써 그들로 하여금 정보이용자들에게 정확한 정보를 제공하는데 도움을 줄 수 있을 것으로 기대한다. Various prior researches investigate the information content of book-tax differences but the concerns about information effects of taxable income are still limited. Accordingly, in this paper, we focus on analyzing the information effects of the taxable income on predictability of future cash flows. In details, we form the first hypothesis that the positive book-tax differences that involve earnings management will reduce predictability of current earnings for future cash flows and the second is that positive book-tax differences that involve tax planning will reduce predictability of current earnings for future cash flows to take empirically analysis. To measure book-tax differences, we use the method of Park Seung-Sick et al.(2006). And we base on Dyreng et al.(2008), Shim Chung-Jin(2011), Wilkie and Limberg(1993) to measure Cash effective tax rates, Expense effective tax rates and Tax subsidy on equity, respectively as proxies of tax planning. The earnings management measure is drawn from modified-Jones model(1995) and Kothari model (1995). The sample consists of non-baking firms(1,4439 firm-years) with December fiscal year listed in Korean Stock Exchange from 2000 to 2009. The empirical results are consistent with hypothesis. First, manager adjusts earnings through discretion accruals for individual incentives and this causes positive book-tax differences which presents low earnings quality. According to this, predictability of current earnings for future earnings is reduced. Second, in the case of manager uses tax planning for decreasing taxable income, current cash flows may be increased relatively to diminished amounts of tax burden. However, because book-tax temporary differences which arise from tax planning cause reversal effects in the next year, so this leads to a decline in cash flows. Alike, predictability of current earnings for future earnings is reduced. Our paper contributes to analysts to consider incremental information effects of taxable income when they analyze accounting earning for providing more exactly accounting information.

Various Techniques of Sentence Embedding using Question-Answering in Game Play

Trieu Thanh Ngoan,이원형 (사)한국컴퓨터게임학회 2022 한국컴퓨터게임학회논문지 Vol.35 No.4

Automatic question-answering is a classical problem in natural language processing, which aims at designing systems that can automatically answer a question, in the same way as human does. The need to query information content available in various formats including structured and unstructured data has become increasingly important. Thus, Question Answering Systems (QAS) are essential to satisfy this need. QAS aim at satisfying users who are looking to answer a specific question in natural language.Moreover, it is a representative of open domain QA systems, where the answer selection process leans on syntactic and semantic similarities between the question and the answering text snippets. Such approach is specifically oriented to languages with fine grained syntactic and morphologic features that help to guide the correct QA match. Furthermore, word and sentence embedding have become an essential part of any Deep-Learning-based natural language processing systems as they encode words and sentences in fixed-length dense vectors to drastically improve the processing of textual data. The paper will concentrate on incorporating the sentence embedding with its various techniques like Infersent, ElMo and BERT in the construction of Question Answering systems, and also it can be used in game play.