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이승재 ( Lee¸ Seungjae ) 한국스페인어문학회 2021 스페인어문학 Vol.- No.100
The purpose of this study is to analyse diverse functions and uses of Spanish article lo. Spanish is the only Romance language which has preserved an neutral and unchangeable article, which is called 'article lo'. Lo can nominalize the adjectives, which, in this way, acquire a meaning equal or similar to that of the neuters of Latin. The nominalization with lo gives abstract character to the adjectives in competition with abstract nouns, etymologically and semantically correlatives. This study is composed of four chapters, an introduction and a conclusion. The first chapter focuses on the difference between 'article lo'(lo esperado) and 'pronoun lo'(lo esperaba). And we examine a variety of uses of Spanish articles by dividing the second chapter into two sections: the comparison of the definite article with the indefinite one (el libro/un libro), and diverse characteristics of the article lo. The third part, the analysis of different functions and uses of the article lo, is divided, in its turn, into three sections: 'lo + adjective'(lo noble=la nobleza; lo bueno=las cosas buenas; en lo alto=en la parte alta), 'lo + relative clause'(toma lo que quieras), and 'lo + adjective/adverb + que'(todos saben lo simpatica que es tu hermana). The fourth chapter addresses impersonal expressions with a sense of topicalization(lo imporante es (que)=es importante (que) ), and idiomatic phrases, which are structured with lo(a lo lejos); and shows how the article lo is interpreted into other languages like English, French and Italian. This investigation on lo is believed to contribute to our understanding of its diverse functions and also to the solution of various communication problems.
Lee, Seungjae,Jang, Changwon,Cho, Jaebum,Yeom, Jiwoon,Jeong, Jinsoo,Lee, Byoungho The Optical Society 2016 Applied optics Vol.55 No.3
<P>Holographic-optical-element (HOE)-based integral imaging display can be applied to augmented reality. However, a narrow viewing angle is a bottleneck for commercialization. Here, we propose a method to enhance the viewing angle of the integral imaging display using Bragg mismatched reconstruction of HOEs. The viewing angle of the integral imaging display can be enlarged with two probe waves, which form two different viewing zones. The effect of Bragg mismatched reconstruction is analyzed with simulation and experiment. In order to show feasibility of the proposed method, a display experiment is demonstrated. (C) 2015 Optical Society of America</P>
Lee, Seungjae,Lee, Sangeun,Kim, Sung Hoon,Park, Heekyung,Park, Sangjun,Yum, Kyungtaek Mary Ann Liebert 2012 Environmental engineering science Vol.29 No.6
<P>This study examined critical factors related to the short-term variation of algae growth in reservoirs during the summer. To this end, statistical tests were carried out at a small dam reservoir to determine how chemical factors (e.g., nutrient concentrations) and physical factors (e.g., theoretical and relative residence times, temperature) influenced the chlorophyll a (Chl-a) concentration. Statistical tests revealed that, although phosphorus (P) concentration was significant for Chl-a, residence time had much stronger relationship to Chl-a concentration than chemical factors. In addition, the study verified that relative residence time (RRT) best explained the relation of water status to algae growth. RRT was found to be useful in identifying water status related to the summer algae bloom. Finally, this study raised the possibility of inhibiting summer algae growth by operating dam reservoirs moderately. These findings need to be seriously considered when reservoir operators establish effective strategies for water quality management in summer.</P>
Analysis and Implementation of Hologram Lenses for See-Through Head-Mounted Display
Lee, Seungjae,Lee, Byounghyo,Cho, Jaebum,Jang, Changwon,Kim, Jonghyun,Lee, Byoungho IEEE 2017 IEEE photonics technology letters Vol.29 No.1
<P>We introduce an approach to implementation of see-through head-mounted displays using hologram lenses, which are categorized by holographic optical elements. The hologram lenses magnify displayed images and superimpose the magnified images on the real-world simultaneously, which allows system configuration to be compact. Here, we investigate imaging properties and optical issues of hologram lenses using the spectral analysis of light field. Also, the astigmatism of hologram lenses is analyzed and its compensation method is proposed and verified. We conclude by describing display results and a practical application of the proposed method.</P>
Stable chimeras of non-locally coupled Kuramoto–Sakaguchi oscillators in a finite array
Lee Seungjae,Cho Young Sul 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.78 No.6
We consider chimera states of coupled identical phase oscillators where some oscillators are phase synchronized (have the same phase) while others are desynchronized. Chimera states of non-locally coupled Kuramoto–Sakaguchi oscillators in arrays of finite size are known to be chaotic transients; after a transient time, all the oscillators are phase synchronized, with the transient time increasing exponentially with the number of oscillators. In this work, we consider a small array of six non-locally coupled Kuramoto–Sakaguchi oscillators and modify the range of the phase lag parameter to destabilize their complete phase synchronization. Under these circumstances, we observe a chimera state spontaneously formed by the partition of oscillators into two independently synchronizable clusters of both stable and unstable synchronous states. In the chimera state, the trajectory of the phase differences of the desynchronized oscillators relative to the synchronous cluster is a stable periodic orbit, and as a result, the chimera state is a stable but not long-lived transient. We observe the chimera state with random initial conditions in a restricted range of the phase lag parameter and clarify why the state is observable in the restricted range using Floquet theory for periodic orbit stability.