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Lee, Jung Seung,Lee, Jong Seung,Lee, Min Suk,An, Soohwan,Yang, Kisuk,Lee, Kyueui,Yang, Hee Seok,Lee, Haeshin,Cho, Seung-Woo American Chemical Society 2017 Chemistry of materials Vol.29 No.10
<P>Application of surface chemistry using bioactive compounds enables simple functionalization of tissue-engineering scaffolds for improved biocompatibility and regenerative efficacy. Recently, surface modifications using natural polyphenols have been reported to serve as efficient multifunctional coating; however, there has yet to be any comprehensive application in tissue engineering. Here, we report a simple, multifunctional surface modification using catechin, a phenolic compound with many biological functions, found primarily in plants, to potentiate the functionality of polymeric scaffolds for bone regeneration by stem cells. We found that catechin hydrate can be efficiently deposited on the surface of various substrates and can greatly increase hydrophilicity of the substrates. While identifying the chemical mechanisms regulating catechin surface coating, we found that catechin molecules can self-assemble into dimers via cation-pi interactions. Interestingly, the intrinsic biochemical functions of catechin coating provided the polymer scaffolds with antioxidative and calcium-binding abilities, resulting in enhanced adhesion, proliferation, mineralization, and osteogenic differentiation of human adipose-derived stem cells (hADSCs). Ultimately, catechin-functionalized polymer nanofiber scaffolds significantly promoted in vivo bone formation by hADSC transplantation in a critical-sized calvarial bone defect. Our study demonstrates that catechin can provide a biocompatible, multifunctional, and cost-effective surface modification chemistry to produce functional scaffolds with improved tissue regenerative efficacy.</P>
Lee, Chorong,Kim, Soohwan,Lim, Se-Jin,Lee, Kyeong-Jun The Korean Society of Fisheries and Aquatic Scienc 2017 Fisheries and Aquatic Sciences Vol.20 No.7
An 8-week feeding trial was conducted to study the effect of dietary supplementation of a biofloc powder on growth performance and non-specific immune response of Litopenaeus vannamei. Seven experimental diets were prepared with supplementation of graded levels of dried biofloc powder by 0, 0.5, 1.0, 2.0, 4.0, 6.0, and 8.0% (designated as Con, BF0.5, BF1, BF2, BF4, BF6, and BF8, respectively). Triplicate groups of shrimp ($1.01{\pm}0.01g$) were hand-fed with one of the diets four times a day. At the end of the feeding trial, significantly (P<0.05) higher growth performance and feed utilization were obtained in BF4 groups compared to those fed the Con diet. The innate immunity of shrimp was improved by the dietary supplementation of biofloc. Dietary inclusion of biofloc at the level of 4.0% significantly increased disease resistance of shrimp against Vibrio harveyi. The results indicate that biofloc might be used as a dietary supplement for growth performance, innate immunity and disease resistance of Pacific white shrimp.
Base Station Association in Wireless Cellular Networks: An Emulation Based Approach
Lee, Soohwan,Son, Kyuho,Gong, Huazhi,Yi, Yung IEEE 2012 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.11 No.8
<P>In order to utilize network resources efficiently and reduce regional congestion, associating mobile stations (MSs) with proper base stations (BSs) is of crucial importance in wireless cellular networks. There have been several load-aware proposals in literature, where most are classified into so-called closed-form approaches. In such approaches, each MS independently and deterministically selects the BS which is expected to provide the highest throughput. The throughput is estimated by a closed-form equation based on the assumption of the Proportional Fair (PF) user scheduler that ensures temporal fairness. However, the closed-form approaches do not perform well when the closed-form equation is not available, e.g., general α-fair user scheduler, where temporal fairness is not guaranteed, or deterministic BS association may make wrong decisions, e.g., under the dynamics of mobility or flow arrivals/departures. In this paper, we propose a novel BS association scheme, called ViSE (Virtual Scheduling based Emulation) to tackle such challenges. It emulates an optimal BS association by running a notion of virtual scheduler, and each MS randomly determines its associated BS with the probability proportional to the throughput virtually allocated by the virtual scheduler. We demonstrate through extensive simulations under various practical scenarios that ViSE outperforms the existing algorithms in terms of user schedulers with diverse fairness and robustness to network dynamics.</P>
( Soohwan Lee ),( Doowon Lee ) 경남대학교 인문과학연구소 2018 人文論叢 Vol.45 No.-
The idiomatically combining expressions (ICEs) are compositional. In the repetitive right dislocation constructions (RDCs), the ICE correlate is identical with the ICE appendix, which is fronted in the appendix clause, followed by clausal ellipsis. The present work introduces the repetitive fragment answer, which is fronted to the sentence-initial position (i.e., Spec-CP) to be focused, followed by clausal ellipsis, keeping its idiomatic meaning unharmed. In the case of the repetitive fragment answer, the function of the focusing adverb modifying the verbal idiom including correlate in the direct (wh-)question is to put a strong emphasis on the correlate and induces the fragment answer to be focused. There is parallelism between the repetitive ICE RDCs and their corresponding repetitive ICE fragment answers in Korean, which shows that a natural consequence under the standard assumption that fragments are derived by ellipsis and are island-insensitive due to the repair effect.
SooHwan Kim,JunHeon Lee,GwanHyun Lee,Jun-Hyung Ryu 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
Activated carbon (AC), extensively used across various industrial sectors, serves as a sponge for different types of gases due to its porous carbon material. These gases are attracted to the carbon substrate via van der Waals forces. In nuclear power plants, AC is commonly used to adsorb radioactive gases such as 86Kr and 134Xe, as well as radioiodine sources like 131I and 133I from gaseous effluents. Even if the adsorbed radioactive gases and radioiodine decay into non-radioactive elements, the spent AC still contains radioactive species with long half-lives, such as 3H (Tritium, T) and 14C (radiocarbon). Minimizing and separating waste that contains long-lived nuclides (e.g., 14C) are pivotal components of an efficient waste management approach. A challenging aspect of effectively managing disposed AC is to minimize long-lived radioactive substances by eliminating them. This paper explores and summarizes the technology used to remove pollutants (3H, 14C) trapped within the pores of Activated carbon through thermochemical vacuum and surface oxidation processes. By recycling and reusing spent Activated carbon, we anticipate a reduction in the volume of radioactive waste, leading to decreased disposal costs. Furthermore, this paper will contribute as a valuable reference in future studies, enhancing the understanding of vacuum thermal desorption and surface oxidation of used Activated carbon.