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Fabrication and Application of Micro Polymer Chip Platform for Rare Cell Sample Preparation
Taehyun Park 한국융합학회 2018 한국융합학회논문지 Vol.9 No.3
본 논문에서는 정확한 수의 희귀 세포 포집 및 이송을 위한 마이크로 폴리머 칩 플랫폼의 디자인과 제작, 그리고 프로토콜을 소개하고 있다. 본 플랫폼과 프로토콜은 기존의 통계학적인 샘플 준비 방법인 희석(Dilution)의 한계와 고가이며 형광염색이 요구되는 유세포분석기(Fluorescence activated cell sorter)의 단점을 극복하였다. 타켓 세포를 선택적으로 쉽고 간단하게 채집할 수 있으며 채집되는 세포의 수는 시각적으로 검증되므로 매우 정확한 방법이다. 또한, 채집된 세포들은 마이크로 챔버 등의 원하는 곳으로 세포의 손실 없이 이송 또는 주입 시킬 수 있다. 본 연구는 암진단 등을 목적으로 하는 칩 속의 실험실(Lab on a chip) 등에 필요한 희귀 세포 샘플 준비를 위해 활용 될 수 있을 뿐만 아니라 세포분석을 위한 싱글/더블/다수 세포 샘플의 준비에도 활용 가능하다. 본 논문에서 제시하는 세포 채집 플랫폼과 프로토콜을 검증하기 위해 5개의 인간 암세포(MCF-7)를 채집한 뒤 세포계수기(Hemocytometer) 안으로 주입시켜 세포의 수를 확인하였다. In this paper, a new micro polymer chip platform and protocol were developed for rare cell sample preparation. The proposed platform and protocol overcome the current limitation of the dilution method which is based on statistics and the FACS method which expensive and requires fluorescence staining. It allows collecting exact number of target cells simply and selectively because the cells are visually confirmed during the collecting process. The collected cells can be transported or spiked into a desired locations, such as a microchamber, without cell loss. This research may applicable not only to a rare cell sample preparation for Lab on a Chip cancer diagnosis, but also to a single/double/multiple cell sample preparation for a cell analysis field. To verify this platform and protocol, five human breast cancer cells (MCF-7) were collected and transported into a hemocytometer chamber.
Park, Taehyun,Chang, Ikwhang,Jung, Ju Hae,Lee, Ha Beom,Ko, Seung Hwan,O'Hayre, Ryan,Yoo, Sung Jong,Cha, Suk Won Elsevier 2017 ENERGY Vol.134 No.-
<P><B>Abstract</B></P> <P>This work investigates the effect of assembly pressure on the performance of a bendable polymer electrolyte fuel cell based on silver nanowire current collectors. We define assembly pressure as the compressive stress exerted by the bendable fuel cell flow structure on the membrane electrode assembly. The performance of the bendable fuel cell increases with increasing assembly pressure while the corresponding ohmic and charge transfer resistances of the fuel cell decrease. While in certain circumstances bending can increase fuel cell performance because it increases the assembly pressure internally exerted on the MEA, we also find that deformation of the flow structures upon bending the fuel cell can negatively affect performance due to non-uniform disruptions in the distribution of reactants. We extract the key electrochemical parameters that are most sensitive to assembly pressure and develop a simulation model for bendable fuel cells using these parameters. This model is validated against the experimental data of here and previous studies, thereby showing the feasibility of engineering the bendable fuel cells for various demands.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bendable polymer electrolyte fuel cell was fabricated using silver nanowires. </LI> <LI> Effect of assembly pressure on bendable fuel cell was investigated experimentally. </LI> <LI> Causes of performance loss by bending in bendable fuel cell were figured out. </LI> <LI> Simulation model of bendable fuel cell was established based on experimental data. </LI> <LI> Simulation model predicts performances of other bendable fuel cells in literatures. </LI> </UL> </P>
The humidifier disinfectant case and the legislative challenges of the 20th Congress
Taehyun Park 환경독성보건학회 2016 환경독성보건학회지 Vol.31 No.-
A number of absurdities surrounding the humidifier disinfectant (HD) incident may have occurred because 1) a judicial system operates on the underlying false assumption that the involved parties are equals in knowledge, information and resource mobilization capabilities, regardless of respective real status as company or individual; 2) there is a lack of a system that mandates a company to prevent and actively manage possible catastrophes; 3) the regulatory scheme makes companies believe that as long as they are complying with the existing regulations, they have satisfied all of their responsibilities. I believe that this issue is an opportunity to bring about changes in the judicial redress system, the system of internal management of manufacturers, and the regulatory system of the government. The following regulation amendments are needed to move towards the changes stated above. First, legislation relating to victim relief that is applicable to the HD incident must be established. Second, a risk management system must be formed within the manufacturing company and to this end an institutional environment for the system must be established within regulatory framework. Furthermore, legislation must be passed that could punish companies themselves that have caused severe damage to individuals because they had failed to take necessary actions to avoid foreseeable harm. Finally, the framework of regulation must be changed so that the company, who has the necessary information regarding the product and the component chemicals used in the product, must self-directed experiment and assessment of the safety of their own products.
Prevalence and Risk Factors of Abusive Behaviors in the Caregivers of People with Dementia in Korea
Taehyun Kim,Hyeon Jeong,Ji Won Han,Kyung Phil Kwak,Bong-Jo Kim,Shin-Kyeom Kim,Jeong Lan Kim,Tae Hui Kim,Seung-Ho Ryu,Seok Woo Moon,Jae Young Park,Joon Hyuk Park,Jae Nam Bae,Jong Chul Youn,Dong Young L 대한신경정신의학회 2018 PSYCHIATRY INVESTIGATION Vol.15 No.7
Objective We investigated the prevalence and risk factors of physically abusive behaviors (PhAB) and psychologically abusive behaviors (PsAB) towards people with dementia (PWD) in family caregivers, and compared their prevalences between East Asian and Western countries. Methods We estimated the prevalence and risk factors of PhAB and PsAB in 467 Korean pairs of community-dwelling PWD and their primary family caregivers. We evaluated abusive behaviors using the Modified Conflict Tactics Scale. In addition, we compared the prevalence of abusive behaviors between Asian and Western countries through a meta-analysis on 12 studies including the current one. Results More than a half of the caregivers reported PsAB and about one out of seven caregivers admitted PhAB within past three months. PsAB and PhAB were slightly more prevalent in East Asian countries than in Western countries. Non-Alzheimer type and moderate to severe behavioral and psychological symptoms of dementia were associated with the risk of PhAB but not with the risk of PsAB. Severe care burden and low income were associated with the risk of PhAB and PsAB. Conclusion PhAB and PsAB were as prevalent in the family caregivers of PWD in Asian countries including Korea as in Western countries. Prevention strategies should be implemented according to the type of abusive behaviors.
The humidifier disinfectant case and the legislative challenges of the 20th Congress
Park, Taehyun The Korean Society of Environmental Toxicology 2016 환경독성보건학회지 Vol.31 No.-
A number of absurdities surrounding the humidifier disinfectant (HD) incident may have occurred because 1) a judicial system operates on the underlying false assumption that the involved parties are equals in knowledge, information and resource mobilization capabilities, regardless of respective real status as company or individual; 2) there is a lack of a system that mandates a company to prevent and actively manage possible catastrophes; 3) the regulatory scheme makes companies believe that as long as they are complying with the existing regulations, they have satisfied all of their responsibilities. I believe that this issue is an opportunity to bring about changes in the judicial redress system, the system of internal management of manufacturers, and the regulatory system of the government. The following regulation amendments are needed to move towards the changes stated above. First, legislation relating to victim relief that is applicable to the HD incident must be established. Second, a risk management system must be formed within the manufacturing company and to this end an institutional environment for the system must be established within regulatory framework. Furthermore, legislation must be passed that could punish companies themselves that have caused severe damage to individuals because they had failed to take necessary actions to avoid foreseeable harm. Finally, the framework of regulation must be changed so that the company, who has the necessary information regarding the product and the component chemicals used in the product, must self-directed experiment and assessment of the safety of their own products.
SEALING OF POLYMER MICRO DEVICES USING A BOILING POINT CONTROL SYSTEM
Taehyun Park(박태현),In-Hyouk Song(송인혁),Michael C. Murphy 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
A new advanced technique for thermoplastic fusion bonding (TPB) using a Pressure-Assisted Boiling Point (PABP) control system was developed. The proposed PABP system enables precise control of both the temperature and pressure in the fusion layer. The temperature variation was ~ 0.1℃ at the target temperature and a uniform pressure distribution was accomplished. Very low aspect ratio channels (AR=1/100, 10 ㎛ in depth and 1000 ㎛ in width) were successfully sealed without deformation or collapse. Bond strengths were greater than 496 ㎪. In addition, a microfluidic system on a non-flat surface was sealed, enabling Lab-on-a-Foil technology. The PABP system can be easily built using inexpensive components and simply operated. Moreover the PABP system should be scalable for mass production and large area devices.
Park, Taehyun,Chang, Ikwhang,Cha, Suk Won American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.12
<P>Triple phase boundaries (TPBs) where electrode, electrolyte, and reactant meet altogether were augmented in thin film solid oxide fuel cell when Pt cathode was deposited on yttrium-doped barium zirconate electrolyte (BZY) via sputter. The augmented TPBs were observed to exist as three-dimensional structures, which is different from what are known to exist as two-dimensional planes or interfaces, by using energy dispersive spectroscopy (EDS). The permeating phenomenon of sputtered Pt into BZY was found to depend on dc sputtering power. Polarization curves showed increasing tendency of maximum powers in accordance with increasing thickness of Pt cathode and spectra of ac impedances showed decreasing tendency of faradaic resistances. If TPBs were located as an interfacial structure between electrode and electrolyte, oxygen could not diffuse well into TPBs, causing radius of semicircle in impedance spectra to decrease. The results are violating this expectation. As a result, as long as charge transfer resistance is a function of temperature, reactant concentration, activation barrier and TPB length, TPB must be only a factor to affect the results in this experiment.</P>