70,522 research outputs found
Ji-Su Kim
No full text학위논문(박사)--아주대학교 일반대학원 :전자공학과,2014. 8DoctoralThe current wireless networks with orthogonal frequency division multiple access (OFDMA) system gives us high speed wireless communication. With high speed, variety mobile services that have different traffic characteristics and requirements have been produced. However, the interference sensitivity of OFDMA system degrades performances of cell-edge users. In addition, the diversity of mobile services causes a channel quality asymmetry between a downlink and an uplink in OFDMA system. Unfortunately, conventional mobility management schemes have not taken account the channel quality asymmetry and the diversity of service traffic. Therefore, this dissertation presents advanced mobility schemes considering the channel quality asymmetry and the diversity of service traffic for improving service continuity and user-perceived performance.
The first proposed mobility scheme is a handover scheme considering downlink-uplink channel quality asymmetry. The proposed handover scheme determines an appropriate handover timing and handover direction according to an estimated uplink channel quality and a measured downlink channel quality. For exploiting an uplink channel quality in handover, an efficient uplink channel estimation method is also proposed. The proposed method estimates an uplink signal strength using the measured downlink signal strength and predicts an uplink interference on the basis of the interference-level information that is from neighbor base stations. To improve user-perceived performances, the proposed handover scheme adjusts weights of handover criteria according to service traffic pattern. Simulation results show that the proposed uplink estimation method can accurately compute the uplink channel quality of neighbor cells where the estimation error rate is less than 0.7%. The simulation results also show that the proposed handover scheme reduces handover-call-dropping probability by up to 69% compared to LTE-Advanced system and the proposed scheme outperforms previous studies in terms of throughput and mean opinion score (MOS). In addition, the end-to-end delay of the proposed scheme is better than that of LTE-Advanced system by 26%.
The second proposed mobility scheme is the user-centric mobility scheme that exploits multipath communication to support seamless mobility. For that, the service continuity management (SCM) protocol is newly designed. SCM has four functional blocks which are located between the application layer and the transport layer. SCM monitors quality of experience (QoE) and makes multiple sessions for one service using multiple radio adaptors in order to maintain QoE requirements. To improve the efficiency of the proposed multipath communication scheme, a high efficiency transport method is proposed. The proposed scheme sends identical packets over multiple paths to improve reliability; likewise, different packets are sent to improve throughput, simultaneously. The simulation results show that the user-centric mobility scheme enable a mobile device to reduce service interruptions during handover in heterogeneous networks. Numerical results indicate that the proposed transport scheme achieves the maximum transport control protocol (TCP) throughput when the proportion of same and different packets is adjusted according to link conditions
Su Youn Kim
No full text학위논문(석사)아주대학교 일반대학원 :의학과,2012. 2ABSTRACT
TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
Ⅰ. INTRODUCTION
Ⅱ. STUDY POPULATION AND METHODS
A. Study Population
B. Method
1. Health Examination Survey
2. Definition of metabolic syndrome
C. Statistical analysis
Ⅲ. RESULT
A. Characteristics of the Study Population
B. AUC of Each Obesity Indicators for Metabolic
Syndrome
Ⅳ. DISCUSSION
Ⅴ. CONCLUSION
REFERENCE
국문요약MasterBackground: Recent studies have suggested that waist to height ratio (WHtR) is the better indicator to predict cardiovascular risk than body mass index (BMI) and waist circumference (WC). The aim of the study is to identify the best anthropometric index among obesity indicators that predicts metabolic syndrome (MS) in different gender and age groups.
Methods: This study is a cross-sectional survey of 6,160 subjects aged 19 years (yr) and over who participated in the Fourth Korea National Health and Nutrition Examination Surveys (KNHANES IV) between January 2008 and December 2008. To compare predictive power of anthropometric indices for MS, the areas under the receiver-operating characteristics curves (AUCs) of BMI, WC and WHtR were calculated.
Results: In entire age population, AUC of WHtR was the largest among obesity indicators to predict MS in both genders. However after adjustment for age, there was no significant difference among three obesity indicators in both men and women. When compared within three different age groups, there was no significant difference among three obesity indices for men and young aged women (19-39yr). AUC of WHtR and WC were similar with each other, but greater than AUC of BMI for middle-aged (40-60yr) and elderly (> 60yr) women.
Conclusion: There is no superiority among obesity indicators to predict MS in men and young women. BMI has less predicting power for MS in middle-aged and elderly women than WC and WHtR
The Identity of a Young Intellectual of Colonial Korea: Focusing on Into the Light by Sa-ryang Kim
No full textThis article explores the theme of diasporic identity as represented in Into the Light (1933), a novel written in the Japanese language by the Korean writer Sa-ryang Kim (1914-1950). The story is set in the days of Japanese imperialism and revolves around the relationship between Minami sensei, a young Korean intellectual studying abroad at the University of Tokyo, and Haruo Yamada, a boy of mixed heritage who was born to a Japanese father and a Korean mother. Like reflections in a mirror, the two figures portray certain contradictions within the empire with their “virtual” identities, which refer to identities borrowed or imagined by the colonized self. While briefly introducing Sa-ryang Kim’s literary achievements, this paper discusses the writings of Koreans during the era of Japanese imperialism. And by delving into the two characters, the paper examines how their identities are defined by Japanese imperialism. Then, as the analysis reveals that the two are complementary figures reflecting each other’s hybrid identity, this study explores how the identity of imperialist diaspora during the colonial period was represented. The protagonist eventually accepts the Korean title Nam sensei together with the Japanese title Minami sensei, and confirms his membership in the colonial diaspora. In contrast, Haruo Yamada identifies his projected self as Japanese, deriding the Korean teacher. This inconsistency is a testament to the wide spectrum of types of identities internalized within the people in “colonial diaspora,” who are, in this case, Koreans who had dispersed outside their colonized homeland and settled in the empire of Japan. The novel demonstrates how the virtual identities held by the members of colonial diaspora are liable to fall apart at any moment
TSG-6 Protects Corneal Endothelium From Transcorneal Cryoinjury in Rabbits
No full textCitation: Kim J-A, Ko JH, Ko AY, et al. TSG-6 protects corneal endothelium from transcorneal cryoinjury in rabbits. Invest Ophthalmol Vis Sci
Author Correction: Evaluation of skin cancer resection guide using hyper‑realistic in‑vitro phantom fabricated by 3D printing
No full textThe original version of this Article contained an error in the spelling of the author Taehun Kim which was incorrectly given as Teahun Kim. The original Article has been corrected
Language and Truth in North Korea
No full textIn this innovative and persuasive volume, Sonia Ryang offers new ways to think about North Korea and how truth emerges over decades from within a dominant discourse. It explores four discrete yet mutually related domains of discourse: North Korea’s literary purge of the 1950s–1960s; its state-initiated linguistic reforms of the 1960s–1980s; stories from a people’s chronicle, more than one hundred volumes in length, documenting interactions with the Great Leader, Kim Il Sung; and the multivolume memoirs of the Great Leader himself, published in the 1990s. These texts are heterogeneous in terms of authorship, style, purpose, and genre, and many have never before been explored in Anglophone studies of North Korea. All have contributed to consolidating a North Korean regime of truth, bringing into existence a set of assumptions and shared understandings that have been regarded as true over the last half century.
Basing her work on a study of these linguistic and discursive domains, Ryang explores the ways in which power, truth, and self are indissolubly connected by function as well as efficacy and how language plays a key role in sustaining their validity. The Kim Il Sung era, from 1945 to Kim’s death in 1994, forms the basis of the book, but the way truth emerged and was sustained during these decades provide important insight into how we can comprehend North Korea today. Rather than view the country as an ideological entity in order to expose its falsehood, so to speak, thinking critically about what it sees as true yields a far more productive outcome for scholarly analysis as well as general understanding.
'Language and Truth in North Korea' will find a ready audience among those interested in North Korea from a wide variety of disciplines, including the social sciences, history, philosophy, and theology.The Open Access edition of this book was made possible with support from the T. T. and W. F. Chao Center for Asian Studies Tenth Anniversary Publication Fund
Supplemental Material - Purpurin suppresses atopic dermatitis via TNF-α/IFN-γ-induced inflammation in HaCaT cells
No full textSupplemental Material for Purpurin suppresses atopic dermatitis via TNF-α/IFN-γ-induced inflammation in HaCaT cells by Jae-Hoon Oh, Seung-Ho Kim, Ok-Kyoung Kwon, Jung-Hee Kim, Sei-Ryang Oh, Sang-Bae Han, Ji-Won Park and Kyung-Seop Ahn in International Journal of Immunopathology and Pharmacology.</p
Peter Kim
No full textL’intervista a Peter Kim, verte sia sugli aspetti artistici e poetici della sua opera che su quelli più propriamente sociologici. In particolare la ricostruzione della storia dell’artista e del suo paese, la Korea, serve da spunto per un’indagine sui meccanismi della creatività, sul ruolo dello shock culturale nello sguardo dell’artista e sul rapporto fra tradizione e modernità
Mooren Ulcer in a Child Wearing Orthokeratology Contact Lenses
No full textPurpose: To report a case of Mooren ulcer that developed in a pediatric patient wearing orthokeratology overnight contact lenses. Methods: Case report. Results: A 10-year-old boy was referred to our clinic because of progressive peripheral corneal ulcer in the right eye, despite the intensive use of fortified antibiotic eye drops. The patient had been using overnight orthokeratology lenses for 4 months before presentation of corneal ulcer. There was no other history of ocular or systemic trauma and disorders. Microbiological tests of the lesion were negative. Systemic evaluation showed no sign of rheumatologic disease. Under a diagnosis of Mooren ulcer, the patient was treated with topical and systemic corticosteroids. After four weeks of treatment, the patient's symptoms rapidly disappeared, and corneal ulcer was healed. The vision recovered to normal with the correction of with-the-rule astigmatism. Conclusions: Mooren ulcer can develop in pediatric patients wearing orthokeratology contact lenses. Given rapid progression of Mooren ulcer in a young population, early diagnosis and proper treatment are essential to prevent a devastating outcome.N
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