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김영관(Younggwan Kim),이주석(Jusuk Lee),김아정(Ajung Kim),홍지만(Jiman Hong) 한국스마트미디어학회 2021 스마트미디어저널 Vol.10 No.1
기계학습이 보편화되면서 기계학습을 활용한 응용 개발 또한 활발하게 이루어지고 있다. 또한 이러한 응용 개발을 지원하기 위한 기계학습 플랫폼 연구도 활발하게 진행되고 있다. 그러나 기계학습 플랫폼 연구가 활발하게 진행되고 있음에도 불구하고 기계학습 플랫폼에 적절한 부하 분산에 관한 연구는 아직 부족하다. 따라서 본 논문에서는 기계학습 분산 환경을 위한 부하 분산 기법을 제안한다. 제안하는 기법은 분산 서버를 레벨 해시 테이블 구조로 구성하고 각 서버의 성능을 고려하여 기계학습 작업을 서버에 할당한다. 이후 분산 서버를 구현하여 실험하고 기존 해싱 기법과 성능을 비교하였다. 제안하는 기법을 기존 해싱 기법과 비교하였을 때 평균 약 26%의 속도 향상을 보였고, 서버에 할당되지 못하고 대기하는 작업의 수가 약 38% 이상 감소함을 보였다. As the machine learning becomes more common, development of application using machine learning is actively increasing. In addition, research on machine learning platform to support development of application is also increasing. However, despite the increasing of research on machine learning platform, research on suitable load balancing for machine learning platform is insufficient. Therefore, in this paper, we propose a load balancing scheme that can be applied to machine learning distributed environment. The proposed scheme composes distributed servers in a level hash table structure and assigns machine learning task to the server in consideration of the performance of each server. We implemented distributed servers and experimented, and compared the performance with the existing hashing scheme. Compared with the existing hashing scheme, the proposed scheme showed an average 26% speed improvement, and more than 38% reduced the number of waiting tasks to assign to the server.
Photonic CDMA Systems with Security Physical Layers
IEEE 2011 IEEE COMMUNICATIONS LETTERS Vol.15 No.1
<P>Cryptographic schemes based on classical information transmission and physical entities are addressed. This scheme provides ways to detect the extent of eavesdropping and does not entirely rely on computational complexity. Its implementations in photonic code division multiple access (CDMA) systems are suggested and secure key distributions under multiplexing environments are examined.</P>
Modulation of KCNK2, two-pore potassium channel, activity regulates adipogenesis
Seoyeong Jung,Ajung Kim,Hojin Lee,Eun Mi Hwang,Jaekwang Lee 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Two-pore domain potassium (K2P) channels are a diverse family of K<SUP>+</SUP> selective ion channels that contribute to background currents in excitable and non-excitable tissues, but the role of K2P channels in adipogenesis is largely unknown. We found that among K2P channels, KCNK2 (also known as TREK-1) is predominantly expressed in preadipocytes and downregulated during insulin-induced differentiation, which causes the reduction of K<SUP>+</SUP> currents and the increase of resting membrane potentials (RMP) of adipocytes. Spadin, selective blocker of TREK-1, 1) significantly blocks K+ current in preadipocytes, but not in matured adipocytes, and 2) accelerates cell differentiation confirmed by ORO staining and WB analysis of adipogeneis markers, and 3) increases Ca<SUP>2+</SUP> signals via L-type C2+ channels in preadipocytes. We also confirmed that primary adipocytes culture downregulated KNCK2 mediated K+ currents. Furthermore, we confirm that high-fat diet (HFD)-fed KNCK2 KO mice increased body fat mass and fat size compared to WT mice. These results suggest that KCNK2 could be a key player of adipogenesis and a potential target of anti-obesity agent by regulating adipogenesis.
A Study of Fronthaul Networks in CRANs - Requirements and Recent Advancements
( Muhammad Waqar ),( Ajung Kim ),( Peter K. Cho ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.10
One of the most innovative paradigms for the next-generation of wireless cellular networks is the cloud-radio access networks (C-RANs). In C-RANs, base station functions are distributed between the remote radio heads (RHHs) and base band unit (BBU) pool, and a communication link is defined between them which is referred as the fronthaul. This leveraging link is expected to reduce the CAPEX (capital expenditure) and OPEX (operating expense) of envisioned cellular architectures as well as improves the spectral and energy efficiencies, provides the high scalability, and efficient mobility management capabilities. The fronthaul link carries the baseband signals between the RRHs and BBU pool using the digital radio over fiber (RoF) based common public radio interface (CPRI). CPRI based optical links imposed stringent synchronization, latency and throughput requirements on the fronthaul. As a result, fronthaul becomes a hinder in commercial deployments of C-RANs and is seen as one of a major bottleneck for backbone networks. The optimization of fronthaul is still a challenging issue and requires further exploration at industrial and academic levels. This paper comprehensively summarized the current challenges and requirements of fronthaul networks, and discusses the recently proposed system architectures, virtualization techniques, key transport technologies and compression schemes to carry the time-sensitive traffic in fronthaul networks.
Surface expression of TTYH2 is attenuated by direct interaction with β-COP
( Jiwon Ryu ),( Dong-gyu Kim ),( Young-sun Lee ),( Yeonju Bae ),( Ajung Kim ),( Nammi Park ),( Eun Mi Hwang ),( Jae-yong Park ) 생화학분자생물학회(구 한국생화학분자생물학회) 2019 BMB Reports Vol.52 No.7
TTYH2 is a calcium-activated, inwardly rectifying anion channel that has been shown to be related to renal cancer and colon cancer. Based on the topological prediction, TTYH2 protein has five transmembrane domains with the extracellular N-terminus and the cytoplasmic C-terminus. In the present study, we identified a vesicle transport protein, β-COP, as a novel specific binding partner of TTYH2 by yeast two-hybrid screening using a human brain cDNA library with the C-terminal region of TTYH2 (TTYH2-C) as a bait. Using in vitro and in vivo binding assays, we confirmed the protein-protein interactions between TTYH2 and β-COP. We also found that the surface expression and activity of TTYH2 were decreased by co-expression with β-COP in the heterologous expression system. In addition, β-COP associated with TTYH2 in a native condition at a human colon cancer cell line, LoVo cells. The over-expression of β-COP in the LoVo cells led to a dramatic decrease in the surface expression and activity of endogenous TTYH2. Collectively, these data suggested that β-COP plays a critical role in the trafficking of the TTYH2 channel to the plasma membrane. [BMB Reports 2019; 52(7): 445-450]