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Search Results: 1 - 10 of 274042 matches for " Lawrence K. F. Wong "
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A Novel Approach for Assessing Prospective Memory Using Immersive Virtual Reality Task  [PDF]
Dong Dong, Lawrence K. F. Wong, Zhiwei Luo
Psychology (PSYCH) , 2016, DOI: 10.4236/psych.2016.710133
Abstract: Prospective memory can maintain our ability to living independently and is important for our daily lives. Evaluation of prospective memory can reflect the severity of cognitive ability regression. Previous studies have developed slide based task and real-life based task to evaluate prospective memory capability in different conditions. As a new technology that can create a realistic test environment, immersive virtual reality (VR) has not yet been widely used in this area. We developed a real-life test environment using the immersive VR technology and asked the subjects to perform common shopping task in it. By comparing the results with the ones from slide-based task, we have demonstrated that immersive VR task has the potential to evaluate perspective memory more accurately in daily life condition.
The Effect of Traction Position in Cervical Traction Therapy Based on Dynamic Simulation Models  [PDF]
Lawrence K. F. Wong, Zhiwei Luo, Nobuyuki Kurusu
Journal of Biomedical Science and Engineering (JBiSE) , 2017, DOI: 10.4236/jbise.2017.105019
Abstract: This study describes the development of a cervical traction therapy simulation model that evaluates two types of the traction positions, namely the sitting position and the inclined position. An anatomically correct human skeleton model and two mechanical traction device models were constructed in simulations using a physics engine. The anterior and posterior intervertebral separations were measured at both positions with a series of traction forces (60N to 200N) and traction angles (10° to 40°). The result suggested that the sitting position caused the subject to lean forward and as a result led to excessive anterior compression when traction angle is over 20 degrees. The inclined position creates greater intervertebral separations on both the anterior and posterior sides than the sitting position. This suggests that the inclined position may be more effective in increasing intervertebral separation than the sitting position.
Assessment of Prospective Memory using fNIRS in Immersive Virtual Reality Environment  [PDF]
Dong Dong, Lawrence K.F. Wong, Zhiwei Luo
Journal of Behavioral and Brain Science (JBBS) , 2017, DOI: 10.4236/jbbs.2017.76018
Abstract: In order to measure real life prospective memory (PM) ability in laboratory setting, previous studies have used photograph-based, video-based and virtual reality (VR)-based to simulate real life environment. In this study, we used the Functional Near-Infrared Spectroscopy (fNIRS) to record participants’ brain activities when they are performing PM tasks in immersive VR environment. 10 participants were asked to perform PM tasks in a virtual environment while wearing a VR headset and an fNIRS device. By comparing the hemodynamic changes of rostral prefrontal cortex (BA10) of the PM component and the ongoing component, the result shows that VR PM task can induce the activation of BA10. In addition, by making use of the fNIRS technique, this study provides a feasible way to measure BA10 activity in simulated real life environment using immersive VR device.
Experiment and Dynamic Simulation of Cervical Tractions in Inclined and Sitting Positions  [PDF]
Lawrence K. F. Wong, Zhiwei Luo, Nobuyuki Kurusu, Keiji Fujino
Open Journal of Therapy and Rehabilitation (OJTR) , 2017, DOI: 10.4236/ojtr.2017.53008
Abstract: This study aims to validate the accuracy of a cervical traction therapy simulation model by comparing the intervertebral separations of six asymptomatic male adults when traction was applied to their cervical spines. The subjects were tested on two mechanical traction devices, representing the inclined and sitting positions. A total of 55 radiographic images of their cervical spines were taken before and during traction. The result showed statistically significant intervertebral space changes in the inclined position but the changes in the sitting position were not statistically significant. The observed changes of the cervical spine were used to adjust parameters of the traction therapy model, which contains a human model with cervical spine built with springs and dampers and two traction devices in inclined and sitting positions. A series of traction forces and traction angles were applied to the model to simulate the actual parameters used in the experiment and the new model was used to evaluate the two traction positions. The result suggested that inclined position creates greater intervertebral separations on the posterior sides. Differences in separations due to age were not observed in both positions. The result also suggested that the inclined position provides better control in positioning the separations at different spinal segments than the sitting position.
Penicillium marneffei Infection in AIDS
Stephenie Y. N. Wong,K. F. Wong
Pathology Research International , 2011, DOI: 10.4061/2011/764293
Abstract: Penicillium marneffei is a dimorphic fungus which is endemic in Southeast Asia. It is an opportunistic pathogen which has emerged to become an AIDS-defining illness in the endemic areas. Early diagnosis with prompt initiation of treatment is crucial for its management. Prompt diagnosis can often be established through careful cytological and histological examination of clinical specimens although microbiological culture remains the gold standard for its diagnosis. Standard antifungal treatment for AIDS patients with penicilliosis is well established. Highly active antiretroviral therapy should be started early together with the antifungal treatment. Special attention should be paid to potential drug interaction between antiretroviral and antifungal treatments. Secondary prophylaxis may be discontinued with a low risk of relapse of the infection once the immune dysfunction has improved. 1. Introduction Penicillium marneffei was first discovered in 1959 by G. Segretain at the Pasteur Institute in Paris. The strain was isolated from bamboo rats dying of disseminated mycosis in Vietnam. The new species was named P. marneffei in honour of Hubert Marneffe, the Director of Pasteur Institute in Indochina [1, 2]. The first report of human infection due to P. marneffei was also reported by G. Segretain who accidentally pricked his finger with a needle containing the yeast cells of P. marneffei. A small nodule appeared at the site of infection followed by lymphangitis 9 days after the accident [3]. The first natural human infection was reported in 1973 from a patient with Hodgkin lymphoma who lived in Southeast Asia [4]. Before the first case was reported in 1988 in a patient infected with the human immunodeficiency virus (HIV) [5], human penicilliosis was uncommon with less than 40 cases reported in the Southeast Asia [6, 7]. However, the incidence of penicilliosis increased rapidly thereafter with the development of HIV pandemic and the infection became one of the commonest acquired immune deficiency syndrome (AIDS)-defining illnesses among HIV-positive patients in endemic areas [8–10]. 2. Mycology P. marneffei is the only dimorphic fungus in the genus of Penicillium. It exists in mycelial form at 25°C but yeast form at 37°C [1]. It shows a rapid growth rate and matures within 3 days at 25–30°C. Its growth is enhanced in Sabouraud dextrose agar but is inhibited by cycloheximide [11]. At 25°C, the colonies of P. marneffei are granular with shade of greenish-yellow colour and a characteristic red diffusible pigment (Figure 1). Little or no red diffusible pigment
The Methodology and Research Participation Experiences of Participants in the Aborted Suicide Attempt Study  [PDF]
Paul W. C. Wong, Noel C. F. Kwok, Konrad Michel, Gilbert K. H. Wong
Psychology (PSYCH) , 2017, DOI: 10.4236/psych.2017.81005
Abstract: The participants’ study participation experiences in an intensive research methodology that examined recent aborted suicide attempts were explored. Individuals aged 18 or above and whose suicide attempts were voluntarily aborted after the suicide crisis negotiation with the police negotiators were interviewed and followed up at 1 and 3 months after the initial interview. Eleven participants gave their consent to the Police Negotiation Cadre of the Hong Kong Police Force for further contact by the research team during June 2012 and December 2014. Nine aborted attempters completed the semi-structured interviews conducted by the research team about their suicide attempt processes and the events leading to that. Seven of them completed the 3 months follow up. The majority of the participants were positive about being approached to take part in the study. They found the experience of talking about their suicide attempts more positive than expected, and felt the study participation was useful for them and meaningful for the society. None of the participants reported being distressed by the recruitment method or the interviews. Results suggest that such sensitive non-treatment research when conducted ethically, participants could benefit from it.
Quantum interest in two dimensions
Edward Teo,K. F. Wong
Physics , 2002, DOI: 10.1103/PhysRevD.66.064007
Abstract: The quantum interest conjecture of Ford and Roman asserts that any negative-energy pulse must necessarily be followed by an over-compensating positive-energy one within a certain maximum time delay. Furthermore, the minimum amount of over-compensation increases with the separation between the pulses. In this paper, we first study the case of a negative-energy square pulse followed by a positive-energy one for a minimally coupled, massless scalar field in two-dimensional Minkowski space. We obtain explicit expressions for the maximum time delay and the amount of over-compensation needed, using a previously developed eigenvalue approach. These results are then used to give a proof of the quantum interest conjecture for massless scalar fields in two dimensions, valid for general energy distributions.
Progresses and problems in nano-tribology
Jianbin Luo,Shizhu Wen,K. Y. Li Lawrence,Patrick L. Wong
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883710
Abstract: The recent development in the four areas of nano-tribology is analysed. They are micro and nano-friction and wear, mi-cro and nano-tribological engineering. The research methods in nano-tribology and thin film lubrication in which five branches are included: equivalent viscusity and flowing characteristics of micro fluid, the transition between ordered molecular film and disordered one, the essence of matrix influence on thin film lubrication, the lubrication mechanism of high polymer lubricants and the problem of superlubricity. Meanwhile, more than 35 problems are proposed which should be solved in the future.
Progresses and problems in nano-tribology

Jianbin Luo,Shizhu Wen,Lawrence K Y Li,Patrick L Wong,

科学通报(英文版) , 1998,
Abstract: The recent development in the four areas of nano-tribology is analysed. They are micro and nano-friction and wear, mi-cro and nano-tribological engineering. The research methods in nano-tribology and thin film lubrication in which five branches are included: equivalent viscusity and flowing characteristics of micro fluid, the transition between ordered molecular film and disordered one, the essence of matrix influence on thin film lubrication, the lubrication mechanism of high polymer lubricants and the problem of superlubricity. Meanwhile, more than 35 problems are proposed which should be solved in the future.
Predicting the Detectability of Thin Gaseous Plumes in Hyperspectral Images Using Basis Vectors
Kevin K. Anderson,Mark F. Tardiff,Lawrence K. Chilton
Sensors , 2010, DOI: 10.3390/s100908652
Abstract: This paper describes a new method for predicting the detectability of thin gaseous plumes in hyperspectral images. The novelty of this method is the use of basis vectors for each of the spectral channels of a collection instrument to calculate noise-equivalent concentration-pathlengths instead of matching scene pixels to absorbance spectra of gases in a library. This method provides insight into regions of the spectrum where gas detection will be relatively easier or harder, as influenced by ground emissivity, temperature contrast, and the atmosphere. Our results show that data collection planning could be influenced by information about when potential plumes are likely to be over background segments that are most conducive to detection.
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