Yanggok, South Korea
Yanggok, South Korea

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Lee U.,253 Yonghyun Dong | Jang I.,253 Yonghyun Dong
Pure and Applied Chemistry | Year: 2010

It has been well recognized that cardiovascular diseases are closely related to blood flow characteristics. Thus, how to predict them accurately enough in an efficient way has been an important research issue. This paper introduces a 1D spectral element model for the blood flow in the human arteries with varying cross-sections. The variational approach is used to formulate the 1D spectral element model. The exact wave solutions to the frequency-domain governing differential equations are used to determine the frequency-dependent shape functions. The spectral finite element model is then applied to some example arteries to investigate flow characteristics such as blood flow rate and blood pressure through the arteries. © 2010 IUPAC.

Park J.-I.,253 Yonghyun dong | Lee H.,253 Yonghyun dong
Electronics Letters | Year: 2011

Proposed is a new area-efficient truncated inversionless Berlekamp-Massey (TiBM) architecture for the Reed-Solomon (RS) decoder. The area-efficient feature of the proposed architecture is obtained by truncating redundant processing elements in the key equation solver (KES) block using the BM algorithm. This increases the hardware utilisation of the processing elements used to solve the key equation and reduces the hardware complexity of the KES block. The proposed TiBM architecture has the lowest hardware complexity compared with conventional KES architectures. © 2011 The Institution of Engineering and Technology.

Hwang J.W.,University of Wisconsin - Milwaukee | Choi J.-H.,253 Yonghyun dong | Choi B.,Yonsei University | Lee G.,Yonsei University | And 3 more authors.
Korean Journal of Chemical Engineering | Year: 2015

We have characterized micro-droplet generation using water immiscible hexafluorophosphate ([PF6])- and bis(trifluoromethylsulfonyl)imide ([Tf2N])-based room temperature ionic liquids (RTILs). The interfacial tension between total 7 RTILs and phosphate buffered saline (PBS) was measured using a tensiometer for the first time. PBS is one of the most commonly used buffer solutions in cell-related researches. The measured interfacial tension ranges from 8.51 to 11.62 and from 9.56 to 13.19 for [Tf2N]- and [PF6]-based RTILs, respectively. The RTILs micro-droplets were generated in a microfluidic device. The micro-droplet size and generation frequency were determined based on continuous monitoring of light transmittance at the interface in microchannel. The size of RTIL micro-droplets was inversely proportional to the increase of PBS solution flow rate and RTILs hydrophobicity, while droplet generation frequency was proportional to those changes. The measured size of RTILs droplets ranged from 0.6 to 10.5 nl, and from 1.0 to 17.1 nl for [Tf2N]- and [PF6]-based RTILs, respectively. The measured frequency of generated RTILs droplets ranged from 2.3 to 37.2 droplet/min, and from 2.7 to 17.1 droplet/min for [Tf2N]- and [PF6]-based RTILs, respectively. The capillary numbers were calculated depending on the RTILs, and ranged from 0.51×10-3 to 1.06×10-3 and from 5.00×10-3 to 8.65×10-3, for [Tf2N]- and [PF6]-based RTILs, respectively. The interfacial tension between RTILs and PBS will contribute to developing bioprocesses using immiscible RTILs. Also, the RTILs micro-droplets will enable the high-throughput monitoring of various biological and chemical reactions using RTILs as new reaction media. © 2015 Korean Institute of Chemical Engineers, Seoul, Korea

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