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Search Results: 1 - 10 of 23914 matches for " Yeonhwa Jo "
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A Current Overview of Two Viroids That Infect Chrysanthemums: Chrysanthemum stunt viroid and Chrysanthemum chlorotic mottle viroid
Won Kyong Cho,Yeonhwa Jo,Kyoung-Min Jo,Kook-Hyung Kim
Viruses , 2013, DOI: 10.3390/v5041099
Abstract: The chrysanthemum ( Dendranthema X grandiflorum) belongs to the family Asteraceae and it is one of the most popular flowers in the world. Viroids are the smallest known plant pathogens. They consist of a circular, single-stranded RNA, which does not encode a protein. Chrysanthemums are a common host for two different viroids, the Chrysanthemum stunt viroid (CSVd) and the Chrysanthemum chlorotic mottle viroid (CChMVd). These viroids are quite different from each other in structure and function. Here, we reviewed research associated with CSVd and CChMVd that covered disease symptoms, identification, host range, nucleotide sequences, phylogenetic relationships, structures, replication mechanisms, symptom determinants, detection methods, viroid elimination, and development of viroid resistant chrysanthemums, among other studies. We propose that the chrysanthemum and these two viroids represent convenient genetic resources for host–viroid interaction studies.
Evolution of and Horizontal Gene Transfer in the Endornavirus Genus
Dami Song, Won Kyong Cho, Sang-Ho Park, Yeonhwa Jo, Kook-Hyung Kim
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0064270
Abstract: The transfer of genetic information between unrelated species is referred to as horizontal gene transfer. Previous studies have demonstrated that both retroviral and non-retroviral sequences have been integrated into eukaryotic genomes. Recently, we identified many non-retroviral sequences in plant genomes. In this study, we investigated the evolutionary origin and gene transfer of domains present in endornaviruses which are double-stranded RNA viruses. Using the available sequences for endornaviruses, we found that Bell pepper endornavirus-like sequences homologous to the glycosyltransferase 28 domain are present in plants, fungi, and bacteria. The phylogenetic analysis revealed the glycosyltransferase 28 domain of Bell pepper endornavirus may have originated from bacteria. In addition, two domains of Oryza sativa endornavirus, a glycosyltransferase sugar-binding domain and a capsular polysaccharide synthesis protein, also exhibited high similarity to those of bacteria. We found evidence that at least four independent horizontal gene transfer events for the glycosyltransferase 28 domain have occurred among plants, fungi, and bacteria. The glycosyltransferase sugar-binding domains of two proteobacteria may have been horizontally transferred to the genome of Thalassiosira pseudonana. Our study is the first to show that three glycome-related viral genes in the genus Endornavirus have been acquired from marine bacteria by horizontal gene transfer.
Commemorative Practices in the Humanities around 1900  [PDF]
Jo Tollebeek
Advances in Historical Studies (AHS) , 2015, DOI: 10.4236/ahs.2015.43017
Abstract: Around 1900, the humanities underwent a metamorphosis which led to the emergence of modern disciplines. This transformation was accompanied by another process, the building of scientific communities. The central question addressed in this essay was how these new disciplinary communities in the humanities were strengthened by commemorative practices. Those practices could be highly diverse, ranging from the dedication of a book and the circulation and collection of photographs to the organisation of tribute events, attending of funerals and writing of obituaries. The forms that these practices could take were mapped out in this essay using material drawn from the archives of three prominent (literary) historians from Belgium and the Netherlands: Paul Fredericq, Robert Fruin and Jan te Winkel.
Teacher Education and the Targeting of Disadvantage  [PDF]
Bruce Burnett, Jo Lampert
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.25064
Abstract: This paper outlines the Exceptional Teachers for Disadvantaged Schools (ETDS) project which began in June 2010 with the aim of developing and documenting an Australian university-based teacher education program specifically focusing on the preparation of high quality teachers for the disadvantaged school sector. ETDS constitutes a novel model of teacher education targeting disadvantaged schooling in that the selection of participating pre-service teachers has been based on their proven academic performance over the first 2 years of their 4-year Bachelor of Education degree. ETDS has established a modified curriculum that better supports the on-campus training of this cohort while also targeting the role of field experience within partner disadvantaged school settings. This paper offers a rationale for the model, unpacks its various phases and provides a justification of the model’s selection criteria based on high academic achievement.
Application of a Computational Tool to Study the Influence of Worn Wheels on Railway Vehicle Dynamics  [PDF]
Jo?o Pombo
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.52009
Abstract: The search for fast, reliable and cost effective means of transport that presents better energy efficiency and less impact on the environment has resulted in renewed interest and rapid development in railway technology. To improve its efficiency and competitiveness, modern trains are required to travel faster, with high levels of safety and comfort and with reduced Life Cycle Costs (LCC). These increasing demands for vehicle requirements imposed by railway operators and infrastructure companies include maintaining the top operational speeds of trainsets during their life cycle, having low LCC and being track friendly. This is a key issue in vehicle design and in train operation since it has a significant impact on the safety and comfort of railway systems and on the maintenance costs of vehicles and infrastructures. The purpose of this work is to analyze how the wear progression on the wheelsets affects the dynamic behavior of railways vehicles and its interaction with the track. For this purpose a vehicle, assembled with new and worn wheels, is studied in realistic operation scenarios. The influence of the wheel profile wear on the vehicle dynamic response is assessed here based on several indicators used by the railway industry. The running stability of the railway vehicles is also emphasized in this study.
Nutritional Quality and Health Benefits of Vegetables: A Review  [PDF]
Jo?o Silva Dias
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.310179
Abstract: Vegetables are considered essential for well-balanced diets since they supply vitamins, minerals, dietary fiber, and phytochemicals. Each vegetable group contains an unique combination and amount of these phytonutriceuticals, which distinguishes them from other groups and vegetables whithin their own group. In the daily diet vegetables have been strongly associated with improvement of gastrointestinal health, good vision, and reduced risk of heart disease, stroke, chronic diseases such as diabetes, and some forms of cancer. Some phytochemicals of vegetables are strong antioxidants and are thought to reduce the risk of chronic disease by protecting against free radical damage, by modifying metabolic activation and detoxification of carcinogens, or even by influencing processes that alter the course of tumor cells. All the vegetables may offer protection to humans against chronic diseases. Nutrition is both a quantity and a quality issue, and vegetables in all their many forms ensure an adequate intake of most vitamins and nutrients, dietary fibers, and phytochemicals which can bring a much-needed measure of balance back to diets contributing to solve many of these nutrition problems. The promotion of healthy vegetable products has coincided with a surging consumer interested in the healthy functionality of food. Because each vegetable contains a unique combination of phytonutriceuticals, a great diversity of vegetables should be eaten to ensure that individual’s diet includes a combination of phytonutriceuticals and to get all the health benefits. This article make a review and discusses the nutritional quality and health benefits of the major groups of vegetables. More interdisciplinary work is required that involves nutritional and food scientists as well as others from biomedical fields to ascertain the thrue function of specific phytonutriceuticals.
Neutrino Oscillations and Superluminal Propagation, in OPERA or Otherwise  [PDF]
Jo?o Magueijo
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.41013
Abstract:

We digress on the implications of recent claims of superluminal neutrino propagation. No matter how we turn it around such behaviour is very odd and sits uncomfortably even within far-fetched theories. In the context of non-linear realizations of the Lorentz group (where superluminal misbehaviour is run of the mill) one has to accept rather contrived constructions to predict superluminal properties for the neutrino. The simplest explanation is to require that at least one of the mass states be tachyonic. We show that due to neutrino mixing, the flavor energy does not suffer from the usual runaway pathologies of tachyons. For non-tachyonic mass states the theories become more speculative. A neutrino specific dispersion relation is exhibited, rendering the amplitude of the effect reasonable for a standard Planck energy. This uses the fact that the beam energy is close to the geometrical average of the neutrino and Planck mass; or, seen in another way, the beam energy is unexceptional but its gamma factor is very large. A dispersion relation crossing over from a low energy bradyonic branch to a high energy tachyonic one is also considered. We comment on consistency with SN 1987Awithin these models.

Accurate Extraction of Effective Gate Resistance in RF MOSFET  [PDF]
Ikkyun Jo, Toshimasa Matsuoka
Circuits and Systems (CS) , 2015, DOI: 10.4236/cs.2015.65015
Abstract: This paper describes the gate electrode resistance of MOSFET and non-quasi-static (NQS) effect for RF operation. The vertical current paths between the silicide layer and poly-silicon are considered in the gate electrode. The vertical current paths are not effective in long-channel devices, but become more significant in short-channel devices. The gate resistance including vertical current paths can reproduce the practical RF characteristics well. By careful separation of the above gate electrode resistance and the NQS effect, the small-signal gate-source admittance can be analyzed with 130-nm CMOS process. Elmore constant (κ) of the NQS gate-source resistance is about five for long-channel devices, while it decreases down to about three for short-channel devices.
Analysis of VTOL UAV Propellant Technology  [PDF]
Daeil Jo, Yongjin Kwon
Journal of Computer and Communications (JCC) , 2017, DOI: 10.4236/jcc.2017.57008
Abstract: Recently, the surge in the interests in unmanned aerial vehicles has soared dra-matically worldwide due to many potential benefits foreseen by this technology. The most widespread use of the commercial drones is a multi-copter form of unmanned aerial vehicle, because of its vertical takeoff and landing (VTOL) capability. However, due to the structural characteristics, it has a disadvantage that the flight time is quite short, which is typically ranging between 15 to 30 minutes. The fixed wing type of unmanned aerial vehicles has a longer flight time and duration, but it is not easy to secure a safe landing space, especially in the city areas. For this reason, demand for vertical fixed take-off and landing aircraft is rapidly increasing throughout the world. This study analyzes the trends and recent development of global VTOL technology and provides a direction into which the current state of the technology should be heading. By comparing the advantage and disadvantage of various VTOP propulsion types, we can clearly identify the most effective form of VTOL propulsion types. Such analysis will be highly beneficial to the drone researchers and scientists in terms of future development.
Development of Jet Training FTD (Flight Training Device) Overhead System  [PDF]
Daeil Jo, Yongjin Kwon
World Journal of Engineering and Technology (WJET) , 2017, DOI: 10.4236/wjet.2017.54059
Abstract: Today, the growth of aerospace industry has led to the development of modular overhead systems that can be applied to a wide variety of aircraft.?It actually maximizes training effectiveness by working in a similar way as to the real aircraft maneuverability. Overhead system control device for aircraft simulator is developed as a module and integrated to the flight simulator. The developed system can replace the similar products imported from overseas at a much lower price, about one third of the imports, while maintaining the same level of functionality and the performance with the counterparts. This price advantage is the main motivation of this development, which is expected to enlarge the commercial training simulator market in our country. This development has been also funded by the government, and we invited several commercial airline pilots to test the equipment. The post operation interview revealed that the developed system at least matches or exceeds the performance of the imported products. With the development completed, it is ready for the commercial production and will help promote the expansion of flight training education at various aerospace universities in Korea.
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