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( Wonjae Hwang ),( Junhan Lee ) 경남대학교 극동문제연구소 2017 ASIAN PERSPECTIVE Vol.41 No.1
South Korea has traditionally maintained close ties with the United States, especially for external security, while more recently it has become closer to China, mainly for economic reasons. In this article we examine whether growing economic ties between South Korea and China promote their cooperation and common policy preferences and simultaneously weaken Korea-US relations. We examine the voting congruence of South Korea and China in the United Nations General Assembly between 1991 and 2012 and find no clear evidence that economic integration promotes congruence. Rather, South Korea`s policy preferences are usually determined by independent consideration of issues.
Relay-Aided NOMA in Uplink Cellular Networks
Wonjae Shin,Heecheol Yang,Vaezi, Mojtaba,Jungwoo Lee,Poor, H. Vincent IEEE Signal Processing Society 2017 IEEE signal processing letters Vol.24 No.12
<P>A new relay-aided non-orthogonal multiple access (NOMA) technique is proposed for multi-cell uplink cellular networks in which each cell supports K single-antenna users by its respective base station (BS) equipped with N (<< K) antennas. Cooperative relaying transmission is used to accommodate more than one user per orthogonal resource block in the context of interference-limited cellular networks. With the proposed relay-aided NOMA, an Alamouti structure of the desired symbol can further be generated at each BS free of interference, which gives rise to diversity gain of two. The proposed scheme does not require any channel state information (CSI) at users. Further, only limited CSI is required at relays and BSs, which can greatly reduce the control overhead.</P>
Cyclic Interference Alignment for Full-Duplex Multi-Antenna Cellular Networks
Wonjae Shin,Jong-Bu Lim,Hyun-Ho Choi,Jungwoo Lee,Vincent Poor, H. Institute of Electrical and Electronics Engineers 2017 IEEE Transactions on Communications Vol. No.
<P>This paper studies full-duplex (FD) cellular networks in which a base station (BS) operated in FD mode with multiple antennas supports multiple uplink and downlink users simultaneously in the same wireless channel. Two typical FD cellular scenarios are considered, one with half-duplex (HD) users and the other with FD users along with the FD BS. For both the cases, a novel constructive method is developed for finding a closed-form interference alignment (IA) solution, named cyclic IA. The core idea behind this approach is to construct a set of loop-equations enabling IA in a cyclic manner, so that beamforming vectors are sequentially determined by solving an eigenvalue problem. It is shown analytically that the proposed cyclic IA can achieve the optimal sum degrees-of-freedom (DoF) when the number of user antennas is large enough to meet the derived conditions. In particular, it is shown that the proposed scheme achieves a twofold DoF gain compared with conventional HD cellular networks even in the presence of inter-link interference, provided the number of users becomes large enough compared with the ratio of the number of BSs and user antennas. Simulation results demonstrate that not only are the analytical DoF results valid, but under a practical multi-cell scenario, the proposed cyclic IA offers significant throughput gains depending on the cell radius.</P>
Wonjae Lee,Yeonyee E. Yoon,Ohkyung Kwon,이희선,Hyo Eun Park,Eun Ju Chun,Su-Yeon Choi,Goo-Yeong Cho,Hyuk-Jae Chang 대한심장학회 2019 Korean Circulation Journal Vol.49 No.5
Background and Objectives: Coronary artery calcium (CAC) scoring in the asymptomatic population can improve cardiovascular risk prediction. We aimed to assess CAC progression and the impact of coronary risk factors on the CAC progression rate in asymptomatic Korean individuals with a baseline CAC score of zero. Methods: The study population was derived from the Korea Initiatives on Coronary Artery Calcification (KOICA) registry: a retrospective, single ethnicity, multicenter registry of asymptomatic individuals who underwent CAC scoring as a part of a health checkup. Individuals with at least two CAC scores and an initial score of zero were included. CAC progression was defined as [√CAC score (follow-up) − √CAC score (baseline)] ≥2.5. The 10-year atherosclerotic cardiovascular disease (ASCVD) risk was calculated. Results: Among 6,268 participants (mean age, 48.0±7.1 years; male, 80.5%), 719 (11.5%) experienced CAC progression during follow-up (median, 109 months; interquartile range, 78–208 months). The CAC progression rate was 0.3%, 1.9%, 4.3%, 8.6%, and 16.7% in years 1–5, respectively. The chance of CAC progression at 5 years was 13.1%, 22.0%, and 27.9% for individuals with a 10-year ASCVD risk of <5%, ≥5% but <7.5%, and ≥7.5%, respectively. A multivariable analysis revealed age, male sex, waist circumference, diabetes, and low-density lipoprotein cholesterol level as independently associated with annualized CAC progression (p<0.001, p=0.017, p=0.025, p=0.032, and p=0.003, respectively). Conclusions: The probability of CAC progression is very low in Korean individuals with a CAC score of zero. However, the risk of CAC progression increases nonlinearly over time, and increases as the 10-year ASCVD risk increases.
Wonjae Kim Ewha Institute of English and American Studies 2019 Journal of English and American studies Vol.17 No.1
Theresa Hak Kyung Cha’s Dictée (1982) is widely known for avant-garde experimental writing, which causes a zealous controversy in academic discourse between postmodernism and Asian-American discourse. Since Cha’s reflections on language, history, and myth are fragmented and disjunctive, this heteroglossia text provides readers diverse clashes, namely, clashes between English and French, national history and personal history, letters and images, lyric and epic et al. Precisely because of these clashes, the text defies the traditional notion of genre and writing, making readers perplexed and challenging to approach and interpret the text. In other words, the text rejects to be identified in a singular identity and leaves heterogeneous space, which is the point where the text is difficult to be located solely in experimentalism or Asian-American discourse. For both of experimental, postmodern and Asian-American discourses, the text has been approached mainly focusing on the first half of the text, which is a collage of excerpts and images of historical figures—Guan Soon Yu, Hyung Soon Huo, Joan of Arc and St. Thérèse of Lisieux. However, the majority of researches fail to read the text’s juxtaposition between the first half and the latter part of the text, since the latter part is almost inaccessible because of the inexplicable forms and contents. In conjunction with Julia Kristeva’s Revolution in Poetic Language and other essays, I argue that Cha’s artistic text unsettles rigidified, fixed and ideological language system with Cha’s own poetic language. In order to do so, I focus on Cha’s poetic utterances in Dictée, expressed in both the first half and the latter part of the book. Cha’s repetitive poetic utterances are a sound that wishes to find a home, and they wish to recuperate matrilineal language. With this poetic utterance, Cha’s writing records the multiple self(s) over the rigidity and fixity of ideological language and history by resisting to be contained in particular language and history that are deeply entrenched in an ideological discourse.