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Search Results: 1 - 10 of 3332 matches for " Sungeon Cho "
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Intelligent Modified Channel and Frequency Offset Estimation Schemes in Future Generation OFDM-Based Packet Communication Systems
Jaemin Kwak,Sungeon Cho,Kitaeg Lim,Pusik Park
EURASIP Journal on Wireless Communications and Networking , 2008, DOI: 10.1155/2008/735732
Abstract: The channel estimation and frequency offset estimation scheme for future generation orthogonal frequency division multiplexing (OFDM-) based intelligent packet communication systems are proposed. In the channel estimation scheme, we use additional 8 short training symbols besides 2 long training symbols for intelligently improving estimation performance. In the proposed frequency offset estimation scheme, we allocate intelligently different powers to the short and long training symbols while maintaining average power of overall preamble sequence. The preamble structure considered is based on the preamble specified in standardization group of IEEE802.11a for wireless local area network (WLAN) and IEEE802.11p for intelligent transportation systems (ITSs). From the simulation results, it is shown that the proposed intelligent estimation schemes can achieve better mean squared error (MSE) performance for channel and frequency offset estimation error than the conventional scheme. The proposed schemes can be used in designing for enhancing the performance of OFDM-based future generation intelligent communication network systems.
Intelligent Modified Channel and Frequency Offset Estimation Schemes in Future Generation OFDM-Based Packet Communication Systems
Kwak Jaemin,Cho Sungeon,Lim Kitaeg,Park Pusik
EURASIP Journal on Wireless Communications and Networking , 2008,
Abstract: The channel estimation and frequency offset estimation scheme for future generation orthogonal frequency division multiplexing (OFDM-) based intelligent packet communication systems are proposed. In the channel estimation scheme, we use additional 8 short training symbols besides 2 long training symbols for intelligently improving estimation performance. In the proposed frequency offset estimation scheme, we allocate intelligently different powers to the short and long training symbols while maintaining average power of overall preamble sequence. The preamble structure considered is based on the preamble specified in standardization group of IEEE802.11a for wireless local area network (WLAN) and IEEE802.11p for intelligent transportation systems (ITSs). From the simulation results, it is shown that the proposed intelligent estimation schemes can achieve better mean squared error (MSE) performance for channel and frequency offset estimation error than the conventional scheme. The proposed schemes can be used in designing for enhancing the performance of OFDM-based future generation intelligent communication network systems.
Posturographic Evaluation of Dizziness Complaining Patients under Suspicion to Develop Parkinson's Disease  [PDF]
Hyun Cho
Neuroscience & Medicine (NM) , 2011, DOI: 10.4236/nm.2011.21004
Abstract: Although the typical clinical signs of Parkinson disease (PD) are tremor, rigidity, bradykinesia, and postural instability, PD is preceded by a preclinical phase during which neuronal degeneration develops without typical symptoms. More general nonspecific symptoms including dizziness have also been described to predate the typical PD signs for several years. All subjects were selected among patients in the Willis Hospital (Pusan, South of Korea), with complaints of diz-ziness from September 2009 to September 2010 and the baseline neurological screening and clinical ENT examination, to which the results were within the normal range. At baseline, 113 participants underwent neurological screening and provided information on dizziness. Of those participants, 103 were enrolled including 63 subjects in the control group. We used posturography. It allows quantitative assessment of vestibular-spinal component of body balance. The parame-ter of average speed of pressure center displacement to the lateral plan (VMX) and antero-posterior plan (VMY), which presented statistically significant differences between the groups except VMX with closed eyes. (p = 0.008 and p = 0.012, with closed eyes). With open eyes, only VMY showed significant difference between the groups (p = 0.010). In this study, the patients with dizziness and subjective complaints related to typical clinical signs of PD complaints presented higher instability in the orthostatic position than the control group of patients with dizziness and without such complaint. It could suggest that dizziness may be one symptom of preclinical PD and progress to overt postural instability. It is believed that a stepwise approach with a simple and inexpensive initial screening test of preclinical PD is required.
To Open or Not to Open: Korean Rice Market  [PDF]
Youngjeen Cho
Beijing Law Review (BLR) , 2014, DOI: 10.4236/blr.2014.54023
Abstract: Although the “tariff only” principle was adopted in the Uruguay Round (UR) negotiations on agricultural products, Korea was able to apply special treatment to its rice and postpone tariffication of rice imports. After two decades of delay, the Korean government officially announced its decision to open its rice market beginning in 2015. This paper examines whether it would be legally possible for the Korean government to postpone the tariffication of rice imports beyond 2014. In order to address the question, this paper outlines the status of Korean rice in the WTO for the last twenty years. Then, it analyzes the arguments of those who are against tarifficating rice and of those who are in support of it. Based on the analysis, it concludes that Korea cannot postpone tariffication under Annex 5 of the Agreement on Agriculture. While it may request for a waiver under Article IX of the WTO Agreement, a careful and thorough examination is required to decide whether to postpone the tariffication beyond 2014.
Revisiting WTO Fisheries Subsidies Negotiations  [PDF]
Youngjeen Cho
Beijing Law Review (BLR) , 2015, DOI: 10.4236/blr.2015.61002
Abstract: Fisheries subsidies negotiation was added to the negotiation agenda of the DDA largely by the concern for the depletion of fishery stocks. Some members, in particular, the Friends of Fish group countries, claimed that over-fishing and overcapacity caused by various fisheries subsidies program have resulted in the depletion of fishery stocks. Therefore, they argued that new disciplines should be introduced to address the situation. In 2007, after more than five years of negotiations, the chairman of the Rules Negotiations Group circulated a consolidated text. However, the negotiations have hardly made progress since then. This paper examines whether the Rule Negotiating Group chair’s text is legally and practically appropriate to serve as a basis for the fisheries subsidies negotiations. In order to address the question, this paper presents the brief history of fisheries subsidies negotiations at the WTO. Then, it analyzes critical issues of the Rule Negotiating Group chair’s text. It also explores the consolidated text of the TPP negotiations. Based on the analysis, it concludes that the basic concept and the principle of the chair’s text are inconsistent with those of the ASCM, and that the structure of the text does not conform those of the ASCM and other WTO agreements. Likewise, the TPP text bears similar problems. Therefore, it is highly questionable whether WTO members and TPP parties can actually achieve the goal to conserve fishery resources. WTO members as well as TPP parties should try to address these problems, so that they can make real progress in negotiations.
Targeting Phosphodiesterase 4 to Block the Link between Acute Exacerbation of Chronic Obstructive Pulmonary Disease and the Metabolic Complications  [PDF]
Eric Cho
Journal of Biosciences and Medicines (JBM) , 2015, DOI: 10.4236/jbm.2015.311007
Abstract: The metabolic disorders such as obesity and diabetes are found to be more frequent in chronic obstructive pulmonary disease (COPD). The chronic systemic inflammation orchestrated by macrophages constitutes one critical pathophysiological process underlying both acute exacerbation of COPD (AECOPD) and its metabolic complications such as obesity and diabetes. The cyclic adenosine monophosphate (cAMP) signaling controlled by phosphodiesterase (PDE) 4 is a pivotal intracellular modulator for macrophages functions in immune inflammatory response underlying AECOPD as well as obesity and diabetes. Targeting PDE4/cAMP signaling has been suggested to be effective in treating AECOPD or the metabolic disorders of obesity and diabetes. It is therefore reasonable to hypothesize that the chronic systemic inflammation can be a critical link between AECOPD and the metabolic disorders and targeting the PDE4/cAMP signaling can be effective to block this link between AECOPD and the associated metabolic complications.
The Concept of “Developing Countries” in the Context of the WTO Fisheries Subsidies Negotiation  [PDF]
Youngjeen Cho
Beijing Law Review (BLR) , 2018, DOI: 10.4236/blr.2018.92010
Abstract: This paper explores the concept of developing countries in the context of the WTO DDA fisheries subsidies negotiations. It raises a question whether the concept of developing countries that is widely used in other WTO agreement should be applicable to the new disciplines on fisheries subsidies. In order to address the question, this paper outlines the history of the DDA fisheries subsidies negotiations and discusses the goal of fisheries subsidies negotiations. Then, it presents the concept of developing countries in the GATT, the WTO and other international institutions, and finds that it is almost exclusively based on economic indicators. Then, it reviews global fish production and the amount of global fisheries subsidies. On the basis of its analysis, this paper finds that, in order to achieve the proposed goal of the new disciplines on fisheries subsidies, and to strike a balance between the environmental and the developmental dimensions of fisheries subsidies, the concept of “developing countries” in the context of fisheries subsidies should be different from that in other WTO agreements. It should not include countries that have leading fishing industry for which the governments provide large amount of subsidies, in particular, fishing capacity-enhancing subsidies.
Work-Family Conflict Influences on Female’s Career Development through Career Expectation  [PDF]
Wei Wang, Taejun Cho
Journal of Human Resource and Sustainability Studies (JHRSS) , 2013, DOI: 10.4236/jhrss.2013.13007
Abstract: Nowadays, women are still underrepresented in the higher positions in most organizations. Some crucial questions are whether family responsibilities affect female career development and career expectation influences the relationship between work and family conflict and career development of women or not. Through surveying the female teachers in Lin Yi University and Shandong Medical College, this article wants to know the correct relationship among work and family conflict, career expectations and career developments for women.
An Integrative Framework for Customizations on Satisfaction: The Case of an Online Jewelry Business in China  [PDF]
Vincent Cho, Candy Lau
Journal of Service Science and Management (JSSM) , 2014, DOI: 10.4236/jssm.2014.72013
Abstract:

Upon the technological advancement of production flexibility, supply chain agility, and customer behavioral tracking, many online businesses now develop their customization strategies. In this regard, this study proposes an integrative framework for customization of product information, transaction handling, product attribute, and sales’ service. We are interested in how these customizations affect customer satisfaction. From our web-based survey on a renowned online jewelry company in China, we collected 1383 responses from its customer database. Our findings showed that information, product and sales’ service customizations have significant influence on customer satisfaction. Moreover, ordinary members as compared with VIP members feel more satisfied once they receive customized services.

Developmental Changes of the Photochemical Reflectance Index (PRI), Chlorophyll Fluorescence and Leaf Pigments Show the Adaptability of Trees to Local Environments  [PDF]
Hokyung Baek, Unhaing Cho
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.81001
Abstract: For plants growing in parks and along the roadsides of a city, the environmental and seasonal regulation of growth, or photosynthesis, is seldom assessed. The phenology of plants may differ due to varying environments, which may result in different growth or adaptability to local environments. Therefore, we explored several assays and optical indicators of photosynthesis and stress in three tree species (Prunus yedoensis Matsum, Zelkova serrata Makino and Acer palmatum Thunb. ) and two herbaceous species (Artemisia princeps Pamp and Taraxacum officinale Weber)growing commonly in three local parks of Changwon city, a large industrial city in Korea. The photochemical reflectance index (PRI), chlorophyll fluorescence, and pigments including chlorophyll and the flavonoids of leaves were monitored over a growing season for two years to evaluate the adaptability of plants to local environments. The values of all measurements exhibited striking seasonal and regional changes. PRI values were closely timed with photosynthetic activity and the pigment formation of leaves, particularly in some tree species. For the tree species, the plants which had the low values of PRI during the active growing season showed low levels of both chlorophyll fluorescence and high level of flavonoid, indicating that these plants were experiencing low photosynthetic activity and the specific needs in growth and development were not sufficiently provided by the local environment. Our results indicate that PRI provided a clear optical indicator of plant adaptability to the local environment and may provide a useful metric of effective growth using remote sensing measurements. Furthermore, the periodic PRI measurement is encouraged to be included in the surveillance program for city plant management.
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