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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.
긴꼬리 분포의 광간섭 단층촬영 데이터세트에 대한 다중 레이블 이미지 분류
( Phuoc-nguyen Bui ),정경희 ( Kyunghee Jung ),( Duc-tai Le ),추현승 ( Hyunseung Choo ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.2
In recent years, retinal disorders have become a serious health concern. Retinal disorders develop slowly and without obvious signs. To avoid vision deterioration, early detection and treatment are critical. Optical coherence tomography (OCT) is a non-invasive and non-contact medical imaging technique used to acquire informative and high-resolution image of retinal area and underlying layers. Disease signs are difficult to detect because OCT images have many areas which are not related to any disease. In this paper, we present a deep learning-based method to perform multi-label classification on a long-tailed OCT dataset. Our method first extracts the region of interest and then performs the classification task. We achieve 98% accuracy, 92% sensitivity, and 99% specificity on our private OCT dataset. Using the heatmap generated from trained convolutional neural network, our method is more robust and explainable than previous approaches because it focuses on areas that contain disease signs.
A critical innovation of photocatalytic degradation for toxic chemicals and pathogens in air
Phuoc Loc Truong,Alemayehu Kidanemariam,박주현 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.100 No.-
Air pollution by toxic chemicals and pathogens (bacteria, viruses, and fungi) has become one of the mostcritical problems worldwide because it has strong negative impacts on human health, both indoors andoutdoors. Photocatalysis is a promising candidate to purify the atmosphere by removing pollutantsamong several physicochemical and biological methodologies. In this review, we discuss photocatalyticmaterials used for air purification, advanced methodologies for photocatalysts synthesis, and principlesof photocatalytic nanoparticles that decompose pollutants, which include inorganic and organiccompounds as well as dangerous pathogens. Recent achievements, outlook, and future directions in thefield are discussed.
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>
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.