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10 Gbps/ch Full-Duplex Optical Link Using a Single-Fiber Channel for Signal Transmission
Nga, Nguyen T. H.,Sangirov, Jamshid,Gwan-Chong Joo,Byueng-Su Yoo,Ukaegbu, Ikechi A.,Tae-Woo Lee,Mu-Hee Cho,Hyo-Hoon Park IEEE 2014 IEEE photonics technology letters Vol.26 No.6
<P>A 10 Gbps/ch full-duplex (simultaneous bidirectional) optical link utilizing two optical subassembly (OSA) transceiver (TRx) modules and two wavelengths, 850 and 1060 nm, for sending and receiving optical signals through a single fiber channel in a fiber array is demonstrated. Each of the OSA TRx modules consists of transmitter/receiver chips, optical fibers embedded in a V-grooved silicon substrate, two 45 ° mirrors formed in fibers, and three silicon optical benches for mounting vertical-cavity surface-emitting lasers, photodiodes (PDs), and monitoring PDs. Mirror-1 in the fiber is coated with a wavelength-filtering layer to reflect transmitted light and pass through received light. Mirror-2 deflects received light to the PD. Two OSA TRx modules were applied in an end-to-end quad small form-factor pluggable optical link for 40-Gbps operation. This optical link showed good performance with clear eye-diagrams and a BER of at <;10<SUP>-12</SUP> Gbps/ch with -8-dBm input power.</P>
Nga Thanh DOAN,Trang Thu TA,Ha Thi Thanh CHU,Anh Thi Quynh LE,May Thi LE,Tuan Hoang PHAM,Thao Thu VUONG 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.2
The purpose of this study is to look at the precise direction and magnitude of cultural elements such as education, gender, power distance, and risk-taking proclivity on ethical decision-making. Data was collected from 194 interviewees in three groups: general business students, accounting major students, and professional auditors in Vietnam. The path analysis is used to test the impact of cultural factors on ethical awareness, ethical judgment, and ethical intention in different dubious scenarios at the personal level as independent variables, intermediate variables, and moderating variables. The metric is the percentage of respondents who believe a particular behavior is unethical based on a set of ethical principles. The researchers used SPSS AMOS software to conduct a confirmatory factor survey to evaluate the convergent and discriminant validity of latent variables. The results show differences between the two groups of students and professionals on these measures, suggesting that all of the four factors have an effect on ethical decision-making. Based on research results, some recommendations are proposed related to the four factors to improve the ethics of future generations of auditors in Vietnam. This study also contributes to the theory of culture in particular and cultural interference in general in the field of accounting-auditing in Vietnam in the process of international integration.
Nga Thi VU,Rod EASTWOOD,Chat Thi NGUYEN,Lam Van PHAM 한국곤충학회 2006 Entomological Research Vol.36 No.4
The fig wax scale Ceroplastes rusci (Linnaeus) is a serious pest of fruit trees in many countries. In the present study we investigated the extent of C. rusci infestation and the range of host species, particularly in fruit orchards, in south-east Vietnam. Captive populations of C. rusci were established to record life history parameters and to investigate the efficacy of an endemic predacious moth, Eublemma amabilis Moore, as a potential biocontrol agent. Heavy infestation of C. rusci (up to 100%) was recorded in soursop and other fruit orchards, and the culturally important Hoa Mai flower was also affected. Captive breeding trials found E. amabilis to be an efficient predator of C. rusci, but an unusual hyperactive trait in early instars of E. amabilis resulted in lower than expected survival rates.The implications of this trait in terms of the laboratory environment, augmentative release protocols and as a survival strategy are discussed.
Nonlinear Speed Control of PM Synchronous Motor with Extended Kalman Filter Observer
Nga Thi-Thuy Vu,Jin-Woo Jung 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.3
This paper proposes a nonlinear speed controller for a permanent magnet synchronous motor (PMSM). In this paper, the load torque is estimated by an extended Kalman filter (EKF) observer because the proposed controller needs its knowledge. To confirm the effectiveness of the proposed control scheme, simulations and experiments are performed under motor parameter variations with a prototype PMSM drive system.
Nga Thi Hang PHAN,Thang Quyet Nguyen,Dung TRUONG,Nguyen The HUYNH 한국유통과학회 2019 The Journal of Asian Finance, Economics and Busine Vol.6 No.2
The paper aims to investigate the factors of brand equity affecting the purchase intention of car buyers in Ho Chi Minh City. The authors use qualitative method and quantitative research to study the matters, specifically using scales and data collected for Cronbach alpha reliability testing, analysizing the discovery factor of EFA, CFA and verifying the regression models through AMOS software with SEM linear modeling. The study proposes four factors: (1) brand awareness, (2) self-expression value, (3) perceived quality, (4) brand psychology impacting on the brand loyalty and intention to buy cars of customers. The results show that all four factors are statistically significant for positive brand loyalty and purchase willing. The results showed that brand loyalty positively affects consumers' intention to buy cars. Among the factors included in the study, the brand psychology is a new factor which developed by experts in the context of Vietnam. This is the first study in Vietnam to quantify clearly the element of "crowd psychology" affecting the interests and habits of Vietnamese consumers. This explains why Vietnamese consumers prefer brands that are familiar in the market and some new cars with nice models and colors suitable for Vietnamese psychology.
Nga-wun Li,Chu-po Ho,Kit-lun Yick,Jin-yun Zhou 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12
As the use of textile polypropylene (PP) fibers becomes more common in commercial textiles and sportswear, theinvestigation of the effects of UV-curable ink on the heat-sensitive PP knitted fabrics is crucial to optimize functional clothingdesign. This study investigated the effects of UV-curable ink on the heat-sensitive PP knitted fabrics when the ink was curedusing UV light at room temperature, to avoid degradation of the PP fabric by high temperature, and provided an alternativecoloring method for PP fabric used in sportswear. The influences of printing parameters such as the printing distance, numberof overprints, and color of ink on fabrics as well as aesthetic, physical, and low-stress mechanical properties in terms oftensile, bending, shearing, surface, and compression were systematically investigated. The results indicated that the physicalproperties and low-stress mechanical properties of PP fabrics printed with UV-curable ink were significantly affected by thenumber of overprints and the color of the prints, whereas the color appearance was affected mainly by the number ofoverprints and the printing distance. In terms of the fabric’s hand value, only 2HB and 2HG5 were significantly affected bythe number of overprints and the color of the prints, with the prediction rate exceeding 40 % among the low-stress mechanicalproperties. The fabric’s hand value was not significantly affected by the thin UV-cured ink film when compared with thefabric itself. Fabric printed in a color with the greatest lightness and the fewest overprints had the lowest fabric weight,thickness, and color difference (ΔE) towards the reference color, in addition to better bending recovery and resilienceproperties. The new knowledge from this study can provide an alternative coloring method for PP knitted fabric to increasethe design variety available to textile designers who use PP fabric. The results from this study contribute to the textile andknitwear design industry.
Nga Thi-Thuy Vu,Dong-Young Yu,Han Ho Choi,Jin-Woo Jung IEEE 2013 IEEE transactions on industrial electronics Vol.60 No.10
<P>This paper presents a new sliding-mode control (SMC) scheme based on Takagi-Sugeno (T-S) fuzzy model for surface-mounted permanent-magnet synchronous motors (SPMSMs). First, a global T-S fuzzy model is given to represent the nonlinear dynamics of the SPMSM. The proposed T-S fuzzy-model-based sliding-mode controller considers motor parameter uncertainties and unknown external noises, so it is robust against motor parameter and load torque variations. Also, the linear matrix inequalities with feasible performance constraints are used to design both the sliding surface and the sliding-mode controller, and the stability of the proposed controller is analytically proven. In this paper, a simple sliding-mode observer is used to estimate load torque information. The proposed observer-based control scheme is implemented by using a Matlab/Simulink simulation tool and a prototype SPMSM drive with a TMS320F28335 DSP. Finally, simulations and experiments have been performed to justify that the proposed observer-based control strategy can guarantee a better performance (i.e., faster dynamic response, less steady-state error, more robustness, etc.) than the conventional observer-based nonfuzzy SMC scheme when there exist motor parameter uncertainties and unknown external disturbances.</P>
High-content analysis of in vitro hepatocyte injury induced by various hepatotoxicants
Nga T. T. Tham,황소련,방지현,이희수,박영일,강석진,강환구,김용상,구현옥 대한수의학회 2019 Journal of Veterinary Science Vol.20 No.1
In vitro prediction of hepatotoxicity can enhance the performance of non-clinical animal testing for identifying chemical hazards. In this study, we assessed high-content analysis (HCA) using multi-parameter cell-based assays as an in vitro hepatotoxicity testing model using various hepatotoxicants and human hepatocytes such as HepG2 cells and human primary hepatocytes (hPHs). Both hepatocyte types were exposed separately to multiple doses of ten hepatotoxicants associated with liver injury whose mechanisms of action have been described. HCA data were obtained using fluorescence probes for nuclear size (Hoechst), mitochondrial membrane potential (TMRM), cytosolic free calcium (Fluo-4AM), and lipid peroxidation (BODIPY). Cellular alterations were observed in response to all hepatotoxicants tested. The most sensitive parameter was TMRM, with high sensitivity at a low dose, next was BODIPY, followed by Fluo-4AM. HCA data from HepG2 cells and hPHs were generally concordant, although some inconsistencies were noted. Both hepatocyte types showed mild or severe mitochondrial impairment and lipid peroxidation in response to several hepatotoxicants. The results demonstrate that the application of HCA to in vitro hepatotoxicity testing enables more efficient hazard identification, and further, they suggest that certain parameters could serve as sensitive endpoints for predicting the hepatotoxic potential of chemical compounds.