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Search Results: 1 - 10 of 45299 matches for " Michael Kung "
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Current City Problems in Beijing: Discussion of PM2.5 Related Toxic Air Pollution  [PDF]
Dan Zhu, Michael Kung
Current Urban Studies (CUS) , 2014, DOI: 10.4236/cus.2014.24030
Abstract: Recent reports show that an estimated one-fifth of the world’s population is suffering from toxic air pollution (Qu, 2013; Liu, 2013; Zhou et al., 2013). This is especially evident in China, where PM2.5 covers one-seventh of China’s total territory. In order to combat this disaster, three aspects will be included in this paper to analyze Beijing’s air pollution management through a scientific and philosophical lens for the future human health in China. The first is to address the dangers of PM2.5 to urban environment and city human health. The second approach is to discuss the causing factors of PM2.5 in Beijing, such as coal burning, untreated industrial and vehicular emissions, and urban construction waste. The third step is to state the short and long term effective measures of toxic air pollution of PM2.5 management in big cities of developing countries. Short term recommended plans stop unnecessary urban construction, reduce outdoor exposure, impose a heavy tax, and collect congestion pricing at peak hours. Long term recommended plans promote the coal gasification process, install smoke emission units, improve public transportation, and support clean energy, such as hydropower, wind power, and solar energy. Since current measures are ineffective, taken as a whole, these approaches will be presented to guide local residents, planners, and governors in developing countries to deal with the toxic air pollution for future healthy city management.
Analysis of Sustainable Energy Systems in Ecovillages: A Review of Progress in BedZED and Masdar City  [PDF]
Dan Zhu, Michael Kung, Liang Zhou
Low Carbon Economy (LCE) , 2015, DOI: 10.4236/lce.2015.61001
Abstract: This paper explores sustainable energy systems in ecovillages based on the concept of the Zero Energy Building. The cases discussed in this paper include BedZED in the United Kingdom and Masdar City in the Middle East. These two communities contain features characterized by the sustainable principles of the ecovillage concept by using renewable energy and reclaimed materials to reach a low/zero energy system in buildings. The creation of more ecovillages and the growth of current ecovillages play an important role in positively solving environmental and social problems. The low energy buildings in the ecovillages also act as a model for communities wishing to implement sustainable development.
Exploring the Useful Reading Strategies among EFL College Students in Taiwan*  [PDF]
Kung Shan-Shan
Chinese Studies (ChnStd) , 2013, DOI: 10.4236/chnstd.2013.24031
Abstract: The major purpose of this study was to understand what the reading strategies the EFL students use more or less among EFL college students in Taiwan. The study focused on three hundred and ninety-eight EFL college students coming from seven colleges located in the north, central, and south Taiwan. The research instrument was a questionnaire modified from Wan-Yin Lin’s Chinese reading strategies questionnaire (2005). The collected data used the Statistical Package for the Social Sciences (SPSS) version 13.0 to analyze the results. The findings of study included the following: first, higher grade students had more variety in using reading strategies than lower grade students; and second, the higher grade students tended to use integrated strategies more than lower grade students. According to the research findings, the researcher provided some recommendations, such as teachers could be better guiders to help students understand the importance of reading in language learning. They can not just focus on teaching listening and speaking, and should enhance the balance development in integrated reading strategies that helped students could read fluently any English materials.
Community Inhabitants’ Attitudes on the Partitioning of Urban Space Derived from South-Eastern Asian Migrant Workers’ Gathering in Urban Commercial Area—A Case Study on Tainan City, Kaohsiung City and Taichung City in Taiwan  [PDF]
Kung-Hung Chen
Sociology Mind (SM) , 2014, DOI: 10.4236/sm.2014.41002
Abstract:

This study is to explore south-eastern Asian migrant workers’ impacts and their influential factors of gathering/consumption activities on divided cities in Tainan City, Kaohsiung City and Taichung City. We will take on an empirical study in the cities’ commercial area or shopping street in three cities. Three major research methods are applied, including questionnaire survey, participant observation and regression analysis. Data will be obtained from the questionnaire answers of local inhabitants and analysed via SPSS10.3 statistical methods. The main outcomes of this study are as follows: 1) In Tainan City, Kaohsiung City and Taichung City, we have found that the partitioning of urban space has begun to become. Among this, the outcome of Taichung City is much stronger than that of the two other cities. 2) In the impacts of migrant workers’ gathering on commercial streets, community inhabitants also have more tolerant attitude than shop keepers. The community inhabitants of Taichung City have more hostile than those of the two other cities. 3) In comparison of South-eastern Asian migrant workers’ gathering in urban commercial area and its relations between the partitioning of urban space, from the viewpoint of local inhabitants, we have found different influential factors among Tainan City, Kaohsiung City and Taichung City. We can say that these factors will be valid predictable variables on divided cities resulted from migrant workers’ gathering/consumption activities in the paper. In the meantime, we can obtain these influential factors among these three cities through two variables: 1) community inhabitants’ socio-economic attributes and 2) community inhabitants’ responses to migrant workers’ gathering/consumption activities in commercial area. Basically we can find these influential factors among the paper which are the same as the Netherlands and Singapore, and not the same as Guangzhou, China.

 

Some Applications of the Poisson Process  [PDF]
Kung-Kuen Tse
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.519288
Abstract: The Poisson process is a stochastic process that models many real-world phenomena. We present the definition of the Poisson process and discuss some facts as well as some related probability distributions. Finally, we give some new applications of the process.
Quiet Zone Design in Diffuse Fields Using Ultrasonic Transducers  [PDF]
Wen-Kung Tseng
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.32036
Abstract:

This paper presents quiet zone design using ultrasonic transducers for local active control in pure tone diffuse fields. Most of researches in local active noise control used conventional loudspeakers for the secondary sources to produce quiet zones. Recently ultrasonic transducers have been used for the secondary sources to control the plane wave in active noise control. However there is no research related to active noise control in diffuse fields using ultrasonic transducers. Therefore this study uses ultrasonic transducers for the secondary sources to control the diffuse fields. The quiet zone produced using ultrasonic transducers in single tone diffuse fields has been analyzed through simulations in this work. The results showed that quiet zones created using ultrasonic transducers were larger than those created using conventional loudspeakers. This is due to the fact that the audible sound pressure produced by the ultrasonic transducers decays slowly with the distance. Therefore the secondary field created by an ultrasonic transducer could fit the primary field better and the larger zone of quiet could be obtained using the ultrasonic transducer. Also the audible sound produced by the ultrasonic transducers is directional; therefore the sound pressure amplification outside the quiet zones was lower.?

Projections and Reflections in Vector Space  [PDF]
Kung-Kuen Tse
Advances in Pure Mathematics (APM) , 2016, DOI: 10.4236/apm.2016.66030
Abstract: We study projections onto a subspace and reflections with respect to a subspace in an arbitrary vector space with an inner product. We give necessary and sufficient conditions for two such transformations to commute. We then generalize the result to affine subspaces and transformations.
Ratio-Cum-Product Estimator Using Multiple Auxiliary Attributes in Two-Phase Sampling  [PDF]
John Kung’u, Leo Odongo
Open Journal of Statistics (OJS) , 2014, DOI: 10.4236/ojs.2014.44024
Abstract:

In this paper, we have proposed three classes of ratio-cum-product estimators for estimating population mean of study variable for two-phase sampling using multi-auxiliary attributes for full information, partial information and no information cases. The expressions for mean square errors are derived. An empirical study is given to compare the performance of the estimator with the existing estimator that utilizes auxiliary attribute or multiple auxiliary attributes. The ratio-cum-product estimator in two-phase sampling for full information case has been found to be more efficient than existing estimators and also ratio-cum-product estimator in two-phase sampling for both partial and no information case. Finally, ratio-cum-product estimator in two-phase sampling for partial information case has been found to be more efficient than ratio-cum-product estimator in two-phase sampling for no information case.

Ratio-Cum-Product Estimator Using Multiple Auxiliary Attributes in Single Phase Sampling  [PDF]
John Kung’u, Leo Odongo
Open Journal of Statistics (OJS) , 2014, DOI: 10.4236/ojs.2014.44023
Abstract:

In this paper, we have proposed a class of ratio-cum-product estimator for estimating population mean of study variable for single phase sampling using multi-auxiliary attributes. The expressions for mean square error are derived. An empirical study is given to compare the performance of the estimator with existing estimators. It has been found that the ratio-cum-product estimator using multiple auxiliary attributes is more efficient than mean per unit, product and ratio estimators using one auxiliary attribute, and Product and Ratio estimators using multiple auxiliary attributes in single phase sampling.

Generalized Ratio-Cum-Product Estimators for Two-Phase Sampling Using Multi-Auxiliary Variables  [PDF]
John Kung’u, Joseph Nderitu
Open Journal of Statistics (OJS) , 2016, DOI: 10.4236/ojs.2016.64052
Abstract: In this paper, we have proposed estimators of finite population mean using generalized Ratio- cum-product estimator for two-Phase sampling using multi-auxiliary variables under full, partial and no information cases and investigated their finite sample properties. An empirical study is given to compare the performance of the proposed estimators with the existing estimators that utilize auxiliary variable(s) for finite population mean. It has been found that the generalized Ra-tio-cum-product estimator in full information case using multiple auxiliary variables is more efficient than mean per unit, ratio and product estimator using one auxiliary variable, ratio and product estimator using multiple auxiliary variable and ratio-cum-product estimators in both partial and no information case in two phase sampling. A generalized Ratio-cum-product estimator in partial information case is more efficient than Generalized Ratio-cum-product estimator in No information case.
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