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B. V. PHUOC(BUI VAN PHUOC),Y. B. Kim(김영복 ),J. S. Jeong(정정순),S. C. Choi(최세철) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
기존 연구에서 제안하는 선박운동표현법은 GPS정보기반의 제어를 위한 것으로, Auto-pilot을 위해서는 적합한 모델이나 예인선의 지원 및 사이드스러스트를 이용하여 접안위치로 이동시키기 위한 목적으로는 부적합하다. 이러한 문제를 극복하기 위해 본 연구에서는 Auto-pilot 개념을 벗어나 예인선의 도움으로 실제 접안이 수행되는 다소 국소적인 영역에서의 선박운동제어 문제에 대해 다루고 있다. 이 경우 항만을 벗어난 대양에서의 운전과는 달리, 선박운동제어성능을 떨어뜨리는 많은 요인들이 존재하기 때문에 보다 체계적인 모델링작업을 통한 명확한 시스템표현이 이루어져야 한다. 따라서 기 존의 모델링기법과 표현법에 의존하지 않고, 미리 설정된 접안목표지점을 기준으로 사이드스러스트에 의해 선박이 병진 운동할 경우를 고려하여, 사이드스러스트의 추진력과 선박운동특성의 관계를 수식화 하는 방법으로 모델링을 수행하였다. 이렇게 표현된 모델을 기반으로 계산과 시스템동정법으로 각각의 파라미터를 구하였다. 제어기 설계에 있어서 직접 계측할 수 없는 일부 상태정보는 관측기를 설계하여 추정하였으며, 시뮬레이션과 실험을 통해 설계한 제어시스템의 유효성을 검증하였다.
Phuoc Quy Phong Nguyen,A.T. Hoang,Abdel Rahman M. S Al-Tawaha 국제이네비해양경제학회 2018 International Journal of e-Navigation and Maritime Vol.9 No.1
Recently, Oil spill incidents from maritime activities and port operation have been causing the serious ocean environment pollution, these problems are said to be the negative effects on the natural environment, social economy, marine species, and human health. Due to the high costs of treating oil spills and oil slick in comparison with a low-income country like Vietnam, many incidents related to the oil spill and oil slick have not been thoroughly processed. Cellulose components from Vietnamese agricultural residues used to produce the absorbent materials are one of the most urgent issues and this is the research object of this work. In this study, two types of structural lengths of cellulose added into PU matrix foam are used to measure how much crude oil, fuel oil, diesel oil and kerosene can be absorbed. The absorbent materials are designed after adding cellulose with 5%, 15%, 25% of mass, respectively. The achieved results show that the oil absorption capacity of PU-cellulose implemented 5% cellulose with 500μm of cellulose structure length and 25% cellulose with 3000μm of cellulose structure length are highest for crude oil. These study results from this work provide a reasonable price for the protection of the marine environment in the strategies of recovery and treatment of oil spill and oil slick on the seawater surface.
Phuoc, Thanh Lam,Jamikorn, Uttra Asian Australasian Association of Animal Productio 2017 Animal Bioscience Vol.30 No.2
Objective: This study aimed to investigate the effects of single or/and double strains of probiotic supplement on feed efficiency, growth performance, and microbial population in distal gastrointestinal tract (GIT) of weaning rabbits. Methods: Sixty-four weaning (28 days old) New Zealand White rabbits were randomly distributed into four groups with treatments including: basal diet without probiotic supplement (control) or supplemented as follows: $1{\times}10^6cfu/g$ B. subtilis (BS group), $1{\times}10^7cfu/g$ L. acidophilus (LA group), or $0.5{\times}10^6cfu/g$ B. subtilis plus $0.5{\times}10^7cfu/g$ L. acidophilus (BL group). During the research, the male and female rabbits were fed separately. Body weight of the rabbits was recorded at 28, 42, and 70 d of age. Results: There was an increase (p<0.05) in body weight gain for the LA group at 42 d. Rabbits fed BL responsed with a greater growth (p<0.05) and better feed conversion ratio (p<0.05) than those fed with no probiotic. Digestibility coefficients of dry matter, organic matter, crude protein, neutral detergent fiber, and gross energy were higher (p<0.05) in LA and BL groups than those in the control group. Male rabbits had higher (p<0.05) Bacilli spp. and Coliformis spp. in the ileum than female rabbits. Rabbits supplemented with BS had greater (p<0.05) numbers of bacilli in all intestinal segments than those receiving no probiotic, whereas intestinal Lactobacilli populations were greater (p<0.001) in the LA and BL diets compared to control. Average intestinal coliform populations were lowest (p<0.05) in the rabbits supplemented with LA as compared to those fed the control and BS. Conclusion: Supplementation of L. acidophilus alone or in combination with B. subtilis at a half of dose could enhance number of gut beneficial bacteria populations, nutrient digestibility, cecal fermentation, feed efficiency, and growth performance, but rabbits receiving only B. subtilis alone were not different from the controls without probiotic.
Modeling of a controlled retransmission scheme for loss recovery in optical burst switching networks
Phuoc Dat Duong,Hong Quoc Nguyen,Thanh Chuong Dang,Viet Minh Nhat Vo 한국전자통신연구원 2022 ETRI Journal Vol.44 No.2
Retransmission in optical burst switching networks is a solution to recover data loss by retransmitting the dropped burst. The ingress node temporarily stores a copy of the complete burst and sends it each time it receives a retransmission request from the core node. Some retransmission schemes have been suggested, but uncontrolled retransmission often increases the network load, consumes more bandwidth, and consequently, increases the probability of contention. Controlled retransmission is therefore essential. This paper proposes a new controlled retransmission scheme for loss recovery, where the available bandwidth of wavelength channels and the burst lifetime are referred to as network conditions to determine whether to transmit a dropped burst. A retrial queue-based analysis model is also constructed to validate the proposed retransmission scheme. The simulation and analysis results show that the controlled retransmission scheme is more efficient than the previously suggested schemes regarding byte loss probability, successful retransmission rate, and network throughput.
The plate on the nonlinear dynamic foundation under moving load
Phuoc T. Nguyen,Thieu V. Vi,Tuan T. Nguyen,Van T. Vu Techno-Press 2023 Coupled systems mechanics Vol.12 No.1
First introduced in 2016, the dynamic foundation model is an interesting topic in which the foundation is described close to reality by taking into account the influence of the foundation mass in the calculation of oscillation and is an important parameter that should be considered. In this paper, a follow-up investigation is conducted with the object of the Mindlin plate on a nonlinear dynamic foundation under moving loads. The base model includes nonlinear elastic springs, linear Pasternak parameters, viscous damping, and foundation mass. The problem is formulated by the finite element analysis and solved by the Newmark-β method. The displacement results at the center of the plate are analyzed and discussed with the change of various parameters including the nonlinear stiffness, the foundation mass, and the load velocity. The dynamic response of the plate sufficiently depends on the foundation mass.
A Novel Approach for Optimal Multimedia Data Distribution in Mobile Cloud Computing
Phuoc Hung, Pham,Aazam, Mohammad,Nguyen, Tien-Dung,Huh, Eui-Nam Hindawi Limited 2014 Advances in multimedia Vol.2014 No.-
<P>With the integration of mobile computing and cloud computing, more diverse services can be provided to the users, supporting the mobility feature of mobile computing along with the power of cloud computing. This new paradigm still faces challenges, especially in terms of performance. When it comes to multimedia data communication, thin clients (such as smart phones and tablets) suffer because of performance and power constraints. Previously done studies have trivially addressed this problem. Therefore, in our paper, we present a framework in which thick clients (laptop or desktop computers) are incorporated into mobile cloud paradigm with attention paid to user mobility. Its objective is to optimize the distribution of multimedia content between the cloud and the thin clients. Our work comes up with both numerical analysis and simulation to justify the validity and the effectiveness of the proposal approach.</P>