User-satisfaction based bandwidth allocation for transmission of multiple sources of human perceptual data     

Cheng-Chun Chang  Tien-Ying Kuo  Yi-Chung Lo  Heung-No Lee  David Askey  Zhi-Hong Mao 《Journal of The Franklin Institute》2012,349(3):879-890

In recent years, more and more point-to-point communication systems involve simultaneous transmission of multiple sources of human perceptual data over a single communication medium. For example, in a teleoperation system or a telerobotic system, streams of video, audio, and haptic data need to be sent from a field place to a remote human operator. Each type of data demands a certain range of transmission rate. This creates conflicts among these data when the available bandwidth is limited.In this paper we study the bandwidth allocation for multiple sources of human perceptual data transmitted over a rate-limited communication channel. We aim to maximize the overall user satisfaction in the data transmission, and formulate an optimization problem for the bandwidth allocation. Using either the logarithmic or exponential form of human perceptual satisfaction function, we are able to derive closed-form solutions for the optimization problem. We show that the optimal bandwidth allocation for each type of data is piecewise linear with respect to the total available bandwidth.  相似文献   

学校改进中教师领导研究述评   总被引：1，自引：0，他引：1  

张佳伟  卢乃桂 《教育学报》2010,6(3)

在学校改进的研究中,教师领导已愈来愈成为重要的研究领域.目前学校改进中教师领导的研究集中于对行使领导力的教师--"领袖教师"的研究,围绕领袖教师在学校改进中的角色、能力、发展以及与他人的关系而展开.整体而言,现有的研究存在以下的特点:(1)领袖教师自身的专业发展是研究的核心;(2)整全式的研究策略;(3)领袖教师与情境的关系研究还较为缺乏.  相似文献   

Metastasis of gastric carcinoma to the thyroid and lung: a case report and review of literature     

Hwa-chan Lee  Fen-fen Chen  Ching-chu Lo  Chung-jing Wang  Wei-chun Lo  Shi-ping Luh 《Journal of Zhejiang University. Science. B》2010,11(7):542-546

Cancer metastasis to the thyroid is extremely rare. The more commonly reported primary sites for metastasis to the thyroid are the kidney, breast, lung, colon, esophagus, and uterus. Thyroid metastasis from the stomach has only been reported in three cases. Herein, we report a 71-year-old man presenting with bilateral thyroid multinodular lesions. Bilateral near-total thyroidectomy was performed due to airway compression with related symptoms. Wedge resection of a suspicious pulmonary nodule, detected on CT, was performed for diagnosis. Polypoid lesions in the stomach were examined by trans-scopic biopsy. Poorly differentiated adenocarcinomas with the same histological profiles were noted at these three sites. The immunohistochemical staining for thyroglobulin of these specimens was negative. We conclude that a new thyroid mass appearing in a patient with present or prior malignancies should raise the concern of metastatic disease.  相似文献   

Ancient materials specificities for their synchrotron examination and insights into their epistemological implications     

Loïc Bertrand  Mathieu Thoury  Etienne Anheim 《Journal of Cultural Heritage》2013,14(4):277-289

The synchrotron characterisation of archaeological and heritage materials has undergone a steep development in the past years, among a range of other advanced characterisation techniques. For synchrotron techniques alone, close to a hundred articles were published in 2011 on such materials, prompting new developments at large scale facilities. However, few publications have discussed the speci?c characteristics of heritage materials in their advanced spectroscopic and imaging study. Here, we suggest that a greater consideration be put on the speci?cities of ancient materials and their theoretical implications on the analytical process. In particular, we discuss the importance of the a posteriori framework of the study of heterogeneous materials considered in their historicity as structuring parameters of their study. Major implications are the relevance of trace analyses, those of majors and we suggest, more importantly, the dynamics between both endpoints. The on-going development of multimodal spectral imaging appears as a way to better address corresponding difficulties. Epistemologically, we suggest that a re?exive approach be developed to explain, structure and possibly contribute to narrowing down the ?eld of possible methodological research.  相似文献   

Where is the “theory” within the field of educational technology research?     

Khe Foon Hew  Min Lan  Ying Tang  Chengyuan Jia  Chung Kwan Lo 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(3):956-971

Critics often characterise the study of educational technology as under-theorised. To test this assertion and to determine the extent of this criticism, the present paper reports an in-depth analysis of the 503 most recent empirical articles published in three selected education-technology-related journals (Computers & Education; Learning, Media and Technology; and British Journal of Educational Technology). These journals were selected because they publish studies related to all education settings rather than focusing on only a certain segment such as higher education; they have broad geographical catchment; and they were the most highly ranked journals in terms of their 2017 journal citation impact factor. The present paper examines how explicitly existing theory was identified in previous research, how theories were applied and how often these theories were advanced in education technology research. In the majority of cases, explicit engagement with theory was absent. Many studies either were wholly bereft of theories or made vague use of theory. Where theory was explicit, the articles were more likely to use theory to conceptualise the research, to inform the data collection or analysis process and to discuss the results. Very few articles reported findings that help us to learn something new about a particular theory (ie, little evidence of theory advancement).  相似文献   

A Whole-School Approach to Guidance: A Hong Kong Experience   总被引：1，自引：0，他引：1  

Eadaoin K. P. Hui  & Rita C. C. Lo 《Pastoral Care in Education》1997,15(2):22-28

As in England, approaches to guidance/pastoral care in Hong Kong have in recent years become more proactive and less exclusively reactive. This paper presents an example of this, focusing on a secondary school in Hong Kong which has sought to implement a whole-school approach through developmental guidance programmes. The writers' evaluation of this suggests that the integration of guidance/PSE into the whole-school curriculum was feasible, with a favourable outcome perceived by the school community. The findings also identified a number of important factors which facilitated the implementation and development of the policy.  相似文献   

Confucius Institutes and China’s soft power: practices and paradoxes     

Joe Tin-yau Lo  Suyan Pan 《Compare》2016,46(4):512-532

Since China’s implementation of the Confucius Institute (CI) project in 2004, most academic works have been written on its objectives, nature, features, development, problems and challenges, especially in terms of soft power projection. Though some of them could unravel the tensions and paradoxes in the CI project, there is a paucity of in-depth and focused analysis on the related issues with a more systematic framework. Utilising Tellis et al.’s tripartite taxonomy approach to power – resources, strategies and outcomes – and integrating it with Nye’s tripartite approach to exercising power – coercion, inducement and attraction – this paper aims to fill this research gap. The findings can shed light on the tensions and paradoxes in China’s development of soft power by providing a more systematic and integrated framework for analysing the dilemmas and predicaments in the exercise of its power strategies in the global age.  相似文献   

Sustainable development as a driver for educational innovation in engineering school: the case of UniLaSalle     

Fatma Fourati-Jamoussi  Michel J.F. Dubois  Maxime Agnès  Valérie Leroux  Loïc Sauvée 《European Journal of Engineering Education》2019,44(4):570-588

ABSTRACT

The potential relationships between innovation and sustainability processes, in engineering education, is neither obvious nor simple, especially when innovation, generally speaking, is promoted regardless of sustainability. We used UniLaSalle (In January 2016, the ‘Institut Polytechnique LaSalle Beauvais’, a French engineering school, merged with another higher education engineering school (ESITPA, Rouen). Both campuses (Beauvais and Rouen) have a common name: UniLaSalle (www.unilasalle.fr). As the interview began during 2015, this article only describes the situation of the Beauvais campus.) as a ‘living Lab’ to identify and analyse the reasons for the integration of innovation and Sustainable Development (SD) in training programmes. The aim is to explore, in a perception and reflective approach, how SD can be understood as a driver for specific innovation attitudes in higher education engineering school. This paper adopts an empirical approach based on a qualitative study, using NVivo 9 software to analyse non-numerical data. Our research suggests that SD can be a structural driver for innovation if it is integrated in a transdisciplinarity approach and not just as a discipline per se.  相似文献   

Learning online,offline, and in-between: comparing student academic outcomes and course satisfaction in face-to-face,online, and blended teaching modalities     

Shu-Chen Yen  Yafen Lo  Angela Lee  JudelMay Enriquez 《Education and Information Technologies》2018,23(5):2141-2153

The purpose of this study was to conduct a three-way comparison of face-to-face, online, and blended teaching modalities in an undergraduate Child Development course to determine if there were differences in student academic outcomes and course satisfaction across modalities. Student academic outcomes were measured by three examinations, one research paper assignment, and the overall course total grade. Course satisfaction was measured by administering the Student Opinion Questionnaire (SOQ) across the three teaching modalities and the Constructivist On-Line Learning Environment Survey (COLLES) to online and blended modalities. Results indicated that students performed equally well on all three examinations, research paper, and the overall course total grade across three teaching modalities, allaying traditional reservations about online and blended teaching efficacy. The SOQ and COLLES analysis found students from the three modalities were equally satisfied with their learning experiences. A Two-Factor Model identifying Face-to-Face Interaction and Learn on Demand (Flexibility) as factors determining student academic outcomes was proposed. Implications, limitations, and future research direction were discussed.  相似文献   

The role of stroke knowledge in reading and spelling in Chinese     

Lap‐yan Lo  Pui‐sze Yeung  Connie Suk‐Han Ho  David Wai‐ock Chan  Kevin Chung 《Journal of Research in Reading》2016,39(4):367-388

The present study examined the types of orthographic knowledge that are important in learning to read and spell Chinese words in a 2‐year longitudinal study following 289 Hong Kong Chinese children from Grade 1 to Grade 2. Multiple regression results showed that radical knowledge significantly predicted children's word reading and spelling performance across the years. Stroke knowledge contributed both concurrently (Grade 1) and longitudinally (Grade 2) to children's spelling performance after controlling for rapid naming, phonological awareness, morphological awareness and radical knowledge. These findings support the significance of radical knowledge in Chinese reading and spelling and the specific role of stroke order knowledge in Chinese spelling. The findings have implications for the design of an effective curriculum for teaching children to spell Chinese characters.  相似文献