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Search Results: 1 - 10 of 4076 matches for " distance "
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The Chancellor’s New Robes: Online Education  [PDF]
Stan Braude, Jon Merrill
Creative Education (CE) , 2013, DOI: 10.4236/ce.2013.47A2009
Abstract: Online education is being rapidly embraced as a cash cow for reputable universities. Although there are legitimate advantages to online learning, the data on learning outcomes are scarce. We point out the reasons why high quality, live classes are unlikely to be replaced by online alternatives. However, we do describe the poor teaching practices that can be inexpensively replaced by online courses. We finally point out that best practices and high quality online education are expensive and cannot generate the revenue expected by university administrators.
Best Practices in Distance Education: A Review  [PDF]
Gabriel Kofi Boahen Nsiah
Creative Education (CE) , 2013, DOI: 10.4236/ce.2013.412108
Abstract: Education plays a significant role in shaping a nation, and the proliferation of Internet-based educational opportunities has expanded distance learning modalities to all parts of the globe. However, though this mode of delivery is being capitalized upon as a result of the opportunities it offers, it is still new to many nations and institutions of learning. This article therefore reviews the best practices that make distance education works. This will better inform nations and their learning institutions as they capitalize on this mode for providing access to education.
Stellar Distance and Velocity  [PDF]
Milo? ?ojanovi?
Journal of Applied Mathematics and Physics (JAMP) , 2019, DOI: 10.4236/jamp.2019.71016
Abstract: In this paper, a method is presented by which it is possible to determine a distance between the sun and a star as well as a velocity at which the star moves relative to the sun. In order to achieve this, it is sufficient to know three positions of the star and the unit vectors determined by the star and three arbitrarily chosen points that do not lie on a single line. The method has been tested using the data generated by a computer program as well as real data obtained by Gaia mission. In the first case, we found the huge differences comparing the results derived by the method to the results calculated by the traditional parallax method. In the second case also, there are large differences between the obtained and the expected results, but primarily because of the form of the input data, that is not fully suited to the proposed method. Under certain conditions, one would be able to find a velocity at which the sun is moving regarding a stationary coordinate system (K) that will be defined later on.
Efficient Techniques and Algorithms for Improving Indoor Localization Precision on WLAN Networks Applications  [PDF]
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2009, DOI: 10.4236/ijcns.2009.27073
Abstract: This paper proposes efficient techniques that allow the deploying of high precision location applications for indoor scenarios over Wireless Local Area Networks (WLAN). Firstly, we compare the use of radio frequency (RF) power levels and relative time delays based on ray-tracing as detection methods to estimate the localization of a set of mobile station using the fingerprint technique. Detection method play an important role in applications of high frequencies techniques for locations systems based on current and emerging standards such as Wi-Fi (802.11x) and Wi-Max (802.16x). The localization algorithm computes the Eucli- dean distance between the samples of signals received from each unknown position and each fingerprint stored in the database or radio-map obtained using the FASPRI simulation tool. Experimental results show that more precision can be obtained in the localization process by means of relative delay instead of RF power detection method. Secondly, the Euclidean distance has been compared with others similarity distance measures. Finally, an interpolation algorithm between the fingerprinting weighing based on the distances has been implemented in order to eliminate those fingerprints that do not contribute to the improvement in the accuracy. These techniques allow obtaining more precision in the localization of indoor mobile devices over WLAN networks.
Evaluating Relational Ranking Queries Involving both Text Attributes and Numeric Attributes  [PDF]
Liang Zhu, Zhaoliang Xie, Qin Ma
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.512B018
Abstract: In many database applications, ranking queries may reference both text and numeric attributes, where the ranking functions are based on both semantic distances/similarities for text attributes and numeric distances for numeric attributes. In this paper, we propose a new method for evaluating such type of ranking queries over a relational database. By statistics and training, this method builds a mechanism that combines the semantic and numeric distances, and the mechanism can be used to balance the effects of text attributes and numeric attributes on matching a given query and tuples in database search. The basic idea of the method is to create an index based on WordNet to expand the tuple words semantically for text attributes and on the information of numeric attributes. The candidate results for a query are retrieved by the index and a simple SQL selection statement, and then top-N answers are obtained. The results of extensive experiments indicate that the performance of this new strategy is efficient and effective.
Study of Chinese Enterprises’ Overseas M & A: Based on National and Corporate Cultural Distance  [PDF]
Bo Xu, Xi Jiang
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.29012

Chinese enterprises’ overseas M & A reached $43.4 billion in 2012, and the number was 26.3 times that of 2003. With Chinese enterprises’ increased overseas M & A cases, Chinese are facing the challenges from culture. This paper studies national cultural distance and enterprise culture distance, and measure relevant distance for 16 Chinese M & A cases.

Comparison of Mallampatti Test, Thyromental Distance and Distance from Tragus to Nares for Predicting Difficult Intubation in Pediatric Patients  [PDF]
Nosheela Basit Rafique, Fauzia Anis Khan
Open Journal of Anesthesiology (OJAnes) , 2014, DOI: 10.4236/ojanes.2014.44016

Clinical criteria for prediction of difficult airway in adults may not be applicable in children and available literature on the topic is limited. The objective of this prospective observational study was to assess the usefulness of Mallampati classification, thyromental distance (Tm) and distance from tragus to nares (Tn) in two groups of pediatric patients, those who are less than five and above five years of age, and to correlate these assessments with different grades of Cormack and Lehane (C&L) classification. One hundred and ninety six pediatric patients from one month to eight years of age, ASA grade I and II and planned for elective surgery under general anesthesia with tracheal intubation were recruited. Age, gender, weight (kg), BMI, distance between tragus and nares (cm), Mallampati grades and thyromental distance (cm) were noted preoperatively. Relationship of these variables with C&L grading at the time of laryngoscopy was recorded. C&L grades 2 & 3 was observed in 28 patients in younger age group (n = 120) as compared to two children above 5 years (n = 76) (p < 0.001). C&L grade 3 was seen with decreasing tragus to nares distance (p < 0.002) and with decreasing Tm distance (p = 0.025) in younger age group. In conclusion, this study showed that distance between tragus to nares, Mallampati classification (if applicable) and thyromental distance can be useful for assessment of

The Effect of Temporal Distance and Social Distance on the Choice of Consumers’ Preferences  [PDF]
Yaozhong Liu, Jinjing Xu
Modern Economy (ME) , 2015, DOI: 10.4236/me.2015.62024
Abstract: Temporal distance is defined as how much time (e.g., past or future) separates between the perceiver’s present time and the target event. Social distance is defined as how distinct is the social target from the perceiver’s self (e.g., oneself vs others). The interpretation of events will change as different psychological distance changes (e.g., Temporal Distance, Spatial Distance, Social Distance) and then affect people’s reactions, judgment and decision-making. In real life, consumers often have to make a choice between two types of products: one of them is often called the “virtue products”, and the other one was accordingly called the “vice products”. This study uses experimental methods to explore the influence of temporal distance and social distance on the choice of consumers’ preference and obtains the following conclusions: 1) When consumers make choices for themselves, compared to now, they are more inclined to choose the virtue product at a future time; when consumers make choices for others, compared to now, they are more inclined to choose the virtue product at a future time; when consumers make choices now, compared to choose for themselves, they are more inclined to choose virtue products for others; when consumers make choices at a future time, compared to choose for themselves , they are more inclined to choose virtue products for others; 2) The ANOVA of eye movements data on virtue products (i.e., fixation length and fixation count) showed that main effects of temporal distance and social distance were significant, but there was not interaction between both factors.
On Graphs with Same Distance Distribution  [PDF]
Xiuliang Qiu, Xiaofeng Guo
Applied Mathematics (AM) , 2017, DOI: 10.4236/am.2017.86062

In the present paper we investigate the relationship between Wiener number W, hyper-Wiener number R, Wiener vectors WV, hyper-Wiener vectors HWV, Wiener polynomial H, hyper-Wiener polynomial HH and distance distribution DD of a (molecular) graph. It is shown that for connected graphs G and G*, the following five statements are equivalent:?


; and if G and G* have same distance distribution DD then they have same W and R but the contrary is not true. Therefore, we further investigate the graphs with same distance distribution. Some construction methods for finding graphs with same distance distribution are given.

Modified Generalized Degree Distance of Some Graph Operations  [PDF]
Shengmei Lv
Advances in Pure Mathematics (APM) , 2018, DOI: 10.4236/apm.2018.86032
Abstract: The modified generality degree distance, is defined as: \"\",?which is a modification of the generality degree distance. In this paper, we give some computing formulas of the modified generality degree distance of some graph operations, such as, composition, join, etc.
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