Minh Khôi Phạm - Academia.edu (original) (raw)

Papers by Minh Khôi Phạm

The impact of weather on traffic and its behavior is not well studied in literature primarily due... more The impact of weather on traffic and its behavior is not well studied in literature primarily due to lack of integrated traffic and weather data. Weather can significant effect the traffic and traffic management measures developed for fine weather might not be optimal for adverse weather.

SPIE Proceedings, 2007

Research studies have shown that advances in computed tomography (CT) technology allow better det... more Research studies have shown that advances in computed tomography (CT) technology allow better detection of pulmonary nodules by generating higher-resolution images. However, the new technology also generates many more individual transversal reconstructions, which as a result may affect the efficiency and accuracy of the radiologists interpreting these images. The goal of our research study is to build a content-based image retrieval (CBIR) system for pulmonary CT nodules. Currently, texture is used to quantify the image content, but any other image feature could be incorporated into the proposed system. Unfortunately, there is no texture model or similarity measure known to work best for encoding nodule texture properties or retrieving most similar nodules. Therefore, we investigated and evaluated several texture models and similarity measures with respect to nodule size, number of retrieved nodules, and radiologist agreement on the nodules' texture characteristic. The results were generated on 90 thoracic CT scans collected by the Lung Image Database Consortium (LIDC). Every case was annotated by up to four radiologists marking the contour of nodules and assigning nine characteristics (including texture) to each identified nodule. We found that Gabor texture descriptors produce the best retrieval results regardless of the nodule size, number of retrieved items or similarity metric. Furthermore, when analyzing the radiologists' agreement on the texture characteristic, we found that when just two radiologists agreed, the average precision increased from 88% to 96% for both Gabor and Markov texture features. Moreover, once three or four radiologists agreed the precision increased to nearly 100%.

2013 16th International Conference on Advanced Robotics (ICAR), 2013

For a pneumatic teleoper ation system, slidingode control laws ensur ing both tr ansparency and l... more For a pneumatic teleoper ation system, slidingode control laws ensur ing both tr ansparency and low switchng (open/close) activity of the valves are developed. Each neumatic actuator has four on/off valves, thus sixteen possible ombinations ("oper ating modes") for the valves exist but nly seven of them are both functional and unique. While revious wor ks have focused on three-mode sliding-based poition control of one pneumatic actuator, this paper develops even-mode sliding-based bilater al control of a teleoper ation ystem compr ising a pair of pneumatic actuator s. The proposed ilater al sliding control scheme is exper imentally validated on pair of actuator s ar r anged in a force-position teleoper ation rchitecture. The results demonstr ate that lever aging the addiional modes of oper ation leads to more efficient and smooth ontrol of the system.

International Journal of Pharmaceutics, 2014

The aims of this study are to increase and explain the mechanism of dissolution enhancement of is... more The aims of this study are to increase and explain the mechanism of dissolution enhancement of isradipine using the sonoprecipitation method for stable nanosuspensions. There have been still few of published researches on formulation of isradipine using nanoparticle engineering. Nanosuspension systems were prepared upon various factors including amplitude and the time length of ultrasonication. The dissolution test was performed according to the USP paddle method in intestinal fluid (pH 6.8). The crystalline structure of drug, the molecular interaction, morphology and size of nanosuspension were also investigated to determine the mechanism of dissolution enhancement. The sonoprecipitation method with use of HPMC 6 showed its potential in enhancement of the drug release rate. Stable nanosuspension was significantly depended on amplitude and time of ultrasonication since these factors affected on the size of nanoparticles. The synergistic effects of reduction of drug crystallinity and particle size could increase the dissolution rate of isradipine by providing a stable nanosuspension. This work may contribute to a new strategy for improvement dissolution rate of isradipine.

Land Use Policy, 2013

At very high policy levels, efforts to reduce emissions from deforestation and forest degradation... more At very high policy levels, efforts to reduce emissions from deforestation and forest degradation (REDD+) are considered to be innovative and cost-effective ways to make forest more valuable standing than cut. In response to climate change, international funding to support reductions in emissions needs to balance conservation and development. The Government of Vietnam is currently coordinating the design of a comprehensive benefit-distribution system, with the ambition to convert certified net emissions reductions into REDD+ revenue and distribute it to local partners in a transparent, equitable and costeffective manner. A pilot scheme is underway in Bac Kan province. With forest cover of 56.6% and a poverty rate of 36.6%, Bac Kan is among the most heavily forested and poorest provinces of Vietnam, making it a potential site for pioneering REDD+ schemes in the country. Research questions were how to incorporate international, national and local stakeholders' investments into any distribution scheme; and how to sustain and manage an efficient, effective and equitable funding scheme for environmental services, including REDD+ revenues. Multiple data collection and analytical methods (including participatory approaches) were used to answer both research questions. Additionally, for the second question, we employed cost-benefit, opportunity cost and economic analyses. Three key concepts formed the research frame for this paper: (1) benefit-distribution systems; (2) reducing emissions from deforestation and forest degradation plus conservation (REDD+); and (3) the broader concept of payments or rewards for ecosystem services; as well as lessons learned from existing, similar schemes. This results shows that an appropriate benefit-sharing system for REDD+ revenues can be developed in such a way that meets international regulations as well as national and sub-national circumstances, particularly for the environmental services' providers who directly protect forests. Vietnam's payments for forest environmental services' and integrated conservation schemes (where conservation and rural development are integrated) serve as a base for the development of a REDD+ benefit-distribution system. We discuss ways of bundling such schemes with REDD+ 'service' payments and income streams from forestry and agroforestry 'goods' to provide short-term food-security/economic return and long-term environmental benefits. This combination is expected to provide sustainable incentives, but further effort is needed in the use of participatory methods and a 'bottom-up' approach to provide a strong base for an effective and equitable REDD+ mechanism at landscape level. Experience drawn from Vietnam, in general, and in Bac Kan, in particular, can be replicated and directly contribute to reducing carbon emissions globally.

Journal of Computers, 2010

Low density parity check (LDPC) codes are error-correcting codes that offer huge advantages in te... more Low density parity check (LDPC) codes are error-correcting codes that offer huge advantages in terms of coding gain, throughput and power dissipation. Error correction algorithms are often implemented in hardware for fast processing to meet the real-time needs of communication systems. However hardware implementation of LDPC decoders using traditional hardware description language (HDL) based approach is a complex and time consuming task. This paper presents an efficient high level approach to designing LDPC decoders using a collection of high level modelling tools. The proposed new methodology supports programmable logic design starting from high level modelling all the way up to FPGA implementation. The methodology has been used to design and implement representative LDPC decoders. A comprehensive testing strategy has been developed to test the designed decoders at various levels. The simulation and implementation results presented in this paper prove the validity and productivity of the new high level design approach.

Insectes Sociaux, 2006

The workers' sting extension in response to noxious stimulations is a common test used to study p... more The workers' sting extension in response to noxious stimulations is a common test used to study physiological modulations of behaviour in the honey bee. In this study, we investigated the variation of the sting extension response between honey bee workers from different patrilines in a colony with a naturally mated queen. We found that the sting extension response varied according to patrilines, indicating a genetic contribution to the intra-colonial variation of this behaviour. Patrilines differed in their responses during successive stimulations applied at a constant level: bees belonging to some patrilines exhibited a constant level of response during repeated stimulations, while others showed a decreasing response under the same conditions. These results fi t well with the models of division of labour based on differences in response thresholds among workers of different subfamilies.

Configurations, 2013

This essay draws on Paul Poiret's Orientalist fashions and fancy-dress party as a case study for ... more This essay draws on Paul Poiret's Orientalist fashions and fancy-dress party as a case study for exploring the relations of race, aesthetics, and technology particularly as they cohere around techno-Orientalism. It situates Poiret's fashions within the history of techno-Orientalism to demonstrate clothing's significance as a virtual technology, as well as a technology of racial virtuality. Focusing on this early instance of techno-Orientalism in French fashion, we see that virtuality does not simply name an externally produced sensorial effect. It is an ideological discourse or cultural system that mediates social relations and related social anxieties. Poiret's wearable virtual technologies provide a useful lens through which to examine the dialectical relations of race and virtuality in which virtual bodies are constituted through racial logics, and racial discourses function virtually.

nguyendangbinh.org, 2008

There are currently two main approaches for systemi-cally developing web applications: by adoptin... more There are currently two main approaches for systemi-cally developing web applications: by adopting application framework or by using some hypermedia-based methodol-ogy. Each of these approaches has its own serious short-comings. To overcome these problems, we propose web event ...

American Journal of Respiratory and Critical Care Medicine, 2003

Pulmonary hypertension (PH) results from constriction and remodeling of pulmonary vessels. Seroto... more Pulmonary hypertension (PH) results from constriction and remodeling of pulmonary vessels. Serotonin contributes to both phenomena through different signaling pathways. The mitogenic effect of serotonin on pulmonary vascular smooth muscle cells is mediated by the serotonin transporter (5-hydroxytryptamine transporter [5-HTT]), whereas its constricting effect is mediated by 5-HT 1B/1D and 5-HT 2A receptors. Here, we investigated the respective roles of 5-HTT and 5-HT receptors on the development of chronic hypoxic PH in mice. During exposure to hypoxia (10% O 2 for 2 weeks), the animals received one of the specific 5-HTT inhibitors citalopram and fluoxetine (10 mg/kg/day), the selective 5-HT 1B/1D receptor antagonist GR127935 (2 and 10 mg/kg/day), or the 5-HT 2A receptor antagonist ketanserin (2 mg/kg/day). Mice treated with the 5-HTT inhibitors showed less right ventricle hypertrophy (ratio of right ventricle/left ventricle ϩ septum ϭ 36.7 Ϯ 2.0% and 35.8 Ϯ 1.3% in citalopram-and fluoxetine-treated mice, respectively, vs. 41.5 Ϯ 1.5% in vehicle-treated mice) and less pulmonary vessel muscularization (p Ͻ 0.01) than those receiving the vehicle. Neither GR127935 nor ketanserin affected these parameters. These data indicate that 5-HTT plays a key role in hypoxia-induced pulmonary vascular remodeling. The effects of serotonin transporter inhibitors on PH in humans deserve investigation.

Computational Science and Its Applications – ICCSA 2014, 2014

ABSTRACT Cloud computing and E-learning are the inevitable trend of computational science in gene... more ABSTRACT Cloud computing and E-learning are the inevitable trend of computational science in general, and information systems and technologies in specific. However, there are not many studies on the adoption of cloud-based E-learning systems. Moreover, while there are many papers on information system adoption as well as customer innovativeness, the innovativeness and adoption in the same model seems to be rare in the literature. The study combines the extended Unified Theory of Acceptance and Use of Technology (UTAUT2) and consumer innovativeness on the adoption of E-learning systems based on cloud computing. A survey was conducted among 282 cloud-based E-learning participants and analyzed by structural equation modeling (SEM). The findings indicate that the adoption of cloud-based E-learning is influenced by performance expectancy, social influence, hedonic motivation, and habit. Interestingly, although innovativeness is not significant to use intention, it has a positive effect on E-learning usage which is relatively new in Vietnam.