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Search Results: 1 - 10 of 52425 matches for " Tschangho John Kim "
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Urban Space with Instant and Ubiquitous Access Technologies  [PDF]
Tschangho John Kim
Journal of Transportation Technologies (JTTs) , 2011, DOI: 10.4236/jtts.2011.13005
Abstract: According to the United Nations, the world will need to build new cities and/or expand existing cities to accommodate about 1.6 billion additional urban residents by 2030. This rapid trend is the result of many complex socio-economic and political factors, and poses unprecedented challenges to the functioning of cities and the quality of life for urban dwellers. The resources needed for accommodating new urban dwellers will be enormous. Can emerging information, communication and ubiquitous access technologies help us to achieve a sustainable global urban system in a ubiquitous technology space, mitigating the consumption of scarce resources?
Automated Autonomous Vehicles: Prospects and Impacts on Society  [PDF]
Tschangho John Kim
Journal of Transportation Technologies (JTTs) , 2018, DOI: 10.4236/jtts.2018.83008
Abstract: All automobile manufacturing companies, Google and Microsoft have announced recently their production of the Fully Automated Autonomous Vehicles (FAAVs), otherwise known as driverless cars. A few FAAVs would be available in the market as early as in 2018, but mostly in 2020’s. When FAAVs will be available to and become affordable by the average consumers, the implications to the society would be far reaching. The purpose of the paper is to examine the prospect of the popularity of FAAVs and their socio-economic implications to the future society of the World. The paper examines potential impacts on selected sectors of the society including changes in demand for automobiles, its impact on the use of oil, on the environment, and on urban land uses, to list a few.
Factsheet: West Sea Crisis In Korea
Nan Kim,John McGlynn
Asia-Pacific Journal : Japan Focus , 2010,
Abstract: The factsheet that follows, prepared by Nan Kim in conjunction with members of the National Campaign to End the Korean War, provides an informative overview of the dangerous military standoff that has been unfolding on the Korean Peninsula ever since South Korea conducted a 4-hour artillery exercise on November 23. The exercise was conducted on Yeonpyeong Island, populated at the time by 1,000 South Korean soldiers and 1,300 civilians, about 12 kilometers from North Korea's coastline. The North, which several times asked the South to cancel the exercise prior to its start, and then called for a halt to the exercise when shells landed closer and closer to the North Korean coastline , responded with direct shelling of the island. This resulted in the killing of two South Korean soldiers and two civilian contractors working on a military base. (Pyongyang later expressed regret for the civilian deaths.). See CSPAN report here.An important detail in the factsheet reported in the Korean but apparently not the English press is that the volume of shelling conducted by the South reveals that this was no minor exercise. Information from South Korea's defense ministry reveals that the South "fired 3,657 times, or over 900 shells per hour," into waters near the Northern Limit Line (NLL).This factsheet was prepared by Nan Kim in conjunction with members of the National Campaign to End the Korean War. Nan Kim is assistant professor of history at the University of Wisconsin, Milwaukee and a specialist on modern Korean war memory.
Selmer varieties for curves with CM Jacobians
John Coates,Minhyong Kim
Mathematics , 2008, DOI: 10.1215/0023608X-2010-015
Abstract: We study the Selmer variety associated to a canonical quotient of the $\Q_p$-pro-unipotent fundamental group of a smooth projective curve of genus at least two defined over $\Q$ whose Jacobian decomposes into a product of abelian varieties with complex multiplication. Elementary multi-variable Iwasawa theory is used to prove dimension bounds, which, in turn, lead to a new proof of Diophantine finiteness over $\Q$ for such curves.
Decoding Reed-Muller codes over product sets
John Kim,Swastik Kopparty
Computer Science , 2015,
Abstract: We give a polynomial time algorithm to decode multivariate polynomial codes of degree $d$ up to half their minimum distance, when the evaluation points are an arbitrary product set $S^m$, for every $d < |S|$. Previously known algorithms can achieve this only if the set $S$ has some very special algebraic structure, or if the degree $d$ is significantly smaller than $|S|$. We also give a near-linear time randomized algorithm, which is based on tools from list-decoding, to decode these codes from nearly half their minimum distance, provided $d < (1-\epsilon)|S|$ for constant $\epsilon > 0$. Our result gives an $m$-dimensional generalization of the well known decoding algorithms for Reed-Solomon codes, and can be viewed as giving an algorithmic version of the Schwartz-Zippel lemma.
Integer Addition and Hamming Weight
John Y. Kim
Computer Science , 2015,
Abstract: We study the effect of addition on the Hamming weight of a positive integer. Consider the first $2^n$ positive integers, and fix an $\alpha$ among them. We show that if the binary representation of $\alpha$ consists of $\Theta(n)$ blocks of zeros and ones, then addition by $\alpha$ causes a constant fraction of low Hamming weight integers to become high Hamming weight integers. This result has applications in complexity theory to the hardness of computing powering maps using bounded-depth arithmetic circuits over $\mathbb{F}_2$. Our result implies that powering by $\alpha$ composed of many blocks require exponential-size, bounded-depth arithmetic circuits over $\mathbb{F}_2$.
A Web-based Tool Combining Different Type Analyses
Kim Henriksen,John Gallagher
Computer Science , 2007,
Abstract: There are various kinds of type analysis of logic programs. These include for example inference of types that describe an over-approximation of the success set of a program, inference of well-typings, and abstractions based on given types. Analyses can be descriptive or prescriptive or a mixture of both, and they can be goal-dependent or goal-independent. We describe a prototype tool that can be accessed from a web browser, allowing various type analyses to be run. The first goal of the tool is to allow the analysis results to be examined conveniently by clicking on points in the original program clauses, and to highlight ill-typed program constructs, empty types or other type anomalies. Secondly the tool allows combination of the various styles of analysis. For example, a descriptive regular type can be automatically inferred for a given program, and then that type can be used to generate the minimal "domain model" of the program with respect to the corresponding pre-interpretation, which can give more precise information than the original descriptive type.
Relationship between body mass index and serum 25-hydroxyvitamin D stronger among Caucasians than African Americans in NHANES adults 2001-2006  [PDF]
Lenore Arab, John S. Adams, Heeyoung Kim, Alice Kohlmeier
Open Journal of Epidemiology (OJEpi) , 2012, DOI: 10.4236/ojepi.2012.21002
Abstract: The rapid decline in circulating levels of serum 25-hydroxyvitamin D in both African Americans and Caucasians in the US population remains unexplained, and appears to parallel the obesity epidemic. The cross sectional data on 7349 Caucasian and African American adults between 21 and 69 years of age from the continuous National Health and Nutrition Examination Study (NHANES) 2001 to 2006 were used to model by race, with smoothing functions, the true relationship between body mass index (BMI), waist circumference and serum 25-hydroxyvitamin D in men and women. Weighted regressions of determinants of serum 25-hydroxyvitamin D levels were analyzed. Serum 25-hydroxyvitamin D is negatively associated with BMI linearly above an inflection point at 20 kg/m2 and positively associated below a BMI of 20 kg/m2. The gender- and age-adjusted regression coefficients of BMI on 25-hydroxyvitamin D levels demonstrate a 50% lower coefficient (r = –0.18 ng/ml/ BMI unit) among African Americans than among Caucasians (r = –0.36 ng/ml/BMI unit). These relationships were as great in men as in women and were replicated when waist circumference was used as a surrogate for visceral fat levels. The extent to which BMI is a strong predictor of serum 25-hydroxyvitamin D levels depends upon BMI being greater than 20 kg/m2. The hockey stick shape of the BMI 25-hydroxyvitamin D relationship needs to be taken into account when adjusting serum values for BMI. Both this inflection and reduction in serum levels of 25-hydroxyvitamin D in the population may be due to sequestration in an increasing adipose tissue reservoir. The interpretation of serum 25-hydroxyvitamin D levels as a biomarker of vitamin D adequacy requires appropriate adjustment of body fat mass.
Unconventional Shale Reservoir’s Property Estimation through Modeling, Case Studies of Australian Shale  [PDF]
Robert Shiver, Kim Nelsen, Eifei Li, John Lee, Grad Dwithes
Energy and Power Engineering (EPE) , 2015, DOI: 10.4236/epe.2015.73007
Abstract: A simplified approach is introduced to model production from shale gas resources. In this approach, a multi-fractured horizontal gas well in a shale formation is divided into four zones. Shale formation between each pair of hydraulic fractures consists of four zones: compacted zone around well-bore (1), shale matrix (2), induced fractures (3) and main hydraulic fractures (4). The main contribution of this study is considering varying permeability for each specific zone implemented in the mathematical presentation of gas flow in shale. Further, gas desorption and slippage effect are applied to the model to capture the realistic gas flow in shale. The nonlinear partial differential equation of gas flow obtained from mass conservations law is then solved numerically for each specific zone with respect to their appropriate boundary conditions. This approach then is applied to three case studies, Cooper Basin, Georgina and Galilee shale. A history matching of the mentioned formations is accomplished to find the most uncertain parameters undertaken through this simplified approach. Results of this study are in an agreement with other methods and it is demonstrated that the simplified approach provides more accurate production forecast for the well-established Georgina asset and is in a good agreement for Cooper and Galilee. This study is also valuable since it provides some rough estimation for shale rock characteristics as the basis for rigorous simulation studies.
Simple and Efficient Text Localization for Compressed Image in Mobile Phone  [PDF]
Jung Hyoun Kim, Adrián Canedo-Rodríguez, Jung Hee Kim, John Kelly
Journal of Signal and Information Processing (JSIP) , 2014, DOI: 10.4236/jsip.2014.54022
Abstract: Extraction of the text data present in images involves Text detection, Text localization, Text tracking, Text extraction, Text Enhancement and Text Recognition. Due to its inherent complexity, traditional text localization algorithms in natural scenes, especially in multi-context scenes, are not implementable under low computational resources architectures such as mobile phones. In this paper, we proposed a simple method to automatically localize signboard texts within JPEG mobile phone camera images. Taking into account the information provided by the Discrete Cosine Transform (DCT) used by the JPEG compression format, we delimitate the borders of the most important text region. This system is simple, reliable, affordable, easily implementable, and quick even working under architectures with low computational resources.
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