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YOON, HYUNJOO,LEE, JOO-YEON,SUK, HEE-JIN,LEE, SUNAH,LEE, HEEYOUNG,LEE, SOOMIN,YOON, YOHAN International Association for Food Protection 2012 Journal of food protection Vol.75 No.12
<P>This study developed models to predict the growth probabilities and kinetic behavior of Salmonella enterica strains on cutting boards. Polyethylene coupons (3 by 5 cm) were rubbed with pork belly, and pork purge was then sprayed on the coupon surface, followed by inoculation of a five-strain Salmonella mixture onto the surface of the coupons. These coupons were stored at 13 to 35°C for 12 h, and total bacterial and Salmonella cell counts were enumerated on tryptic soy agar and xylose lysine deoxycholate (XLD) agar, respectively, every 2 h, which produced 56 combinations. The combinations that had growth of ≥0.5 log CFU/cm2 of Salmonella bacteria recovered on XLD agar were given the value 1 (growth), and the combinations that had growth of <0.5 log CFU/cm2 were assigned the value 0 (no growth). These growth response data from XLD agar were analyzed by logistic regression for producing growth/no growth interfaces of Salmonella bacteria. In addition, a linear model was fitted to the Salmonella cell counts to calculate the growth rate (log CFU per square centimeter per hour) and initial cell count (log CFU per square centimeter), following secondary modeling with the square root model. All of the models developed were validated with observed data, which were not used for model development. Growth of total bacteria and Salmonella cells was observed at 28, 30, 33, and 35°C, but there was no growth detected below 20°C within the time frame investigated. Moreover, various indices indicated that the performance of the developed models was acceptable. The results suggest that the models developed in this study may be useful in predicting the growth/no growth interface and kinetic behavior of Salmonella bacteria on polyethylene cutting boards.</P>
Water-Assisted Selective Hydrodeoxygenation of Lignin-Derived Guaiacol to Monooxygenates
Yoon, Ji Sun,Choi, Jae-Wook,Suh, Dong Jin,Lee, Kangtaek,Lee, Hyunjoo,Ha, Jeong-Myeong Wiley-VCH 2015 ChemCatChem Vol.7 No.17
<P> Water, which frequently inhibits organic reactions, improves the hydrodeoxygenation activity of lignin-derived guaiacol on a bifunctional catalyst of Rh/SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3<SUB> in a biphasic mixture of n-decane and water. The unique properties of subcritical water appear to promote hydrodeoxygenation, which improves the production of monooxygenates by removing more oxygen atoms of guaiacol while suppressing the formation of fully deoxygenated hydrocarbons because of the poor solubility of hydrophobic monooxygenates. </P>
Working hours and depressive symptoms
Yeogyeong Yoon,Jia Ryu,Hyunjoo Kim,Chung won Kang,Kyunghee Jung-Choi 대한직업환경의학회 2018 대한직업환경의학회지 Vol.30 No.-
Background: South Korea is one of the countries with the longest working hours in the OECD countries. The aim of this study was to evaluate the effect of working hours on depressive symptoms and the role of job stress factors between the two variables among employees in South Korea. Methods: This study used data from the Korea Working Conditions Survey in 2014. Study subjects included 23,197 employees aged 19 years or older who work more than 35 h per week. Working hours were categorized into 35–39, 40, 41–52, 53–68, and more than 68 h per week. Depressive symptoms were assessed using the WHO’s Well-Being Index with a cut-off score of 13. We calculated prevalence ratios of depressive symptoms according to working hours using log-binomial regression. Through the percentage change in prevalence ratios, we identified the extent of the role of job stress factors that explain depressive symptoms. Results: The risks of depressive symptoms were significantly higher in people who worked 35–39 h per week (PR: 1.09, CI: 1.01–1.18), 53–68 h/week (PR: 1.21, CI: 1.16–1.25), and more than 68 h/week (PR: 1.14, CI: 1.07–1.21) than 40 h/week, after adjusting for confounding variables. Job stress explained the effects of long working hours on depressive symptoms in about 20–40% of the groups working more than 40 h/week. Among the factors of job stress, social support was 10–30%, which showed the highest explanatory power in all working hours. Reward explained 15–30% in the more than 52 h working group, and reward was the most important factor in the working group that exceeded 68 h. Conclusions: We showed the working hours could be an independent risk factor for depressive symptoms in employees. To improve workers’ mental health, it is important to strengthen social support in the workplace, to provide adequate rewards as they work, and ultimately to regulate the appropriate amount of working hours.
Lee, Hyunjoo J,Son, Yoojin,Kim, Jeongyeon,Lee, C Justin,Yoon, Eui-Sung,Cho, Il-Joo Royal Society of Chemistry 2015 Lab on a chip Vol.15 No.6
<P>Multi-functional neural probes integrated with various stimulation modalities are becoming essential tools in neuroscience to study the brain more effectively. In this paper, we present a new multi-functional neural probe that allows chemical stimulation through drug delivery and simultaneous recording of individual neuron signals through a microelectrode array. By embedding microchannels in silicon using a proposed glass reflow process, we successfully fabricated 40 μm thick silicon neural probes suitable for small animal experiments. The electrochemical impedance spectroscopy confirms that impedance of iridium microelectrodes is low enough (<1 Mω at 1 kHz) to measure neural signals. Flow rate characterization in a 0.9% w/v agarose gel shows the capability to deliver a small volume of drugs (<1 μl) at a controlled flow rate. We demonstrate the viability and potential of this new probe by conducting in vivo experiments on mice. Because of the proposed compact structure, both action potentials of individual neurons and local field potentials (LFP) at the thalamus region of a mouse brain were successfully detected with a noise level of ~30 μVpp. Furthermore, we successfully induced absence seizure by injecting seizure-inducing drugs (baclofen) at a local target region and observed distinctive changes in neural signal patterns. Specifically, spike-wave discharge (SWD), which is an indicative signal pattern of absence seizure, was successfully recorded. These signals were also directly compared to SWD detected after inducing absence seizure through direct injection of baclofen through the abdomen. This work demonstrates the potential of our multi-functional neural probes for use in effective investigation of brain functions and disorders by using widely available mouse models.</P>
Lee, Yoon Jin,Kim, Bohyoung,Ko, Yousun,Cho, Kyung Eun,Hong, Seong Sook,Kim, Dong Hwan,Song, Hyunjoo,Lee, Kyoung Ho American Roentgen Ray Society 2015 American Journal of Roentgenology Vol.205 No.5
<P>The purpose of this study is to assess the advantages of additional multiplanar sliding-slab averaging review of 2-mm-thick (thin) sections over stack review of 5-mm-thick (thick) sections in difficult cases of 2-mSv CT in adolescents and young adults with suspected appendicitis.</P>
정상가족 규범과 한국의 주택공급정책에 대한 비판적 고찰
박윤혜 ( Yoon Hye Park ),정현주 ( Hyunjoo Jung ) 한국도시지리학회 2021 한국도시지리학회지 Vol.24 No.3
In contemporary society, Families and units of reproduction are changing. The rapid demographic change is likely generating policy mismatch. This paper examines the history of housing policy in South Korea, and critically investigates the embedded ideology that shapes the contemporary policy drawing on the New Institutionalism as a frame of analysis. As a result, the familism and normal family ideology as a macroscopic culture affect housing policy and lead to the point-based apartment application system. Even the special housing supply for the newly married couples and first-time buyers embrace the ‘normality’ of families, resulting in its re-enforcement. Policy makers should reconsider the actual demander of housing market and reflect the reality on the housing scheme. Additionally, the population strategy of housing policy should be transformed.
MEMS devices for drug delivery
Lee, Hyunjoo J.,Choi, Nakwon,Yoon, Eui-Sung,Cho, Il-Joo Elsevier 2018 Advanced drug delivery reviews Vol.128 No.-
<P><B>Abstract</B></P> <P>Novel drug delivery systems based on microtechnology have advanced tremendously, but yet face some technological and societal hurdles to fully achieve their potential. The novel drug delivery systems aim to deliver drugs in a spatiotemporal- and dosage-controlled manner with a goal to address the unmet medical needs from oral delivery and hypodermic injection. The unmet needs include effective delivery of new types of drug candidates that are otherwise insoluble and unstable, targeted delivery to areas protected by barriers (<I>e</I>.<I>g</I>. brain and posterior eye segment), localized delivery of potent drugs, and improved patient compliance. After scrutinizing the design considerations and challenges associated with delivery to areas that cannot be efficiently targeted through standard drug delivery (<I>e</I>.<I>g</I>. brain, posterior eye segment, and gastrointestinal tract), this review provides a summary of recent advances that addressed these challenges and summarizes yet unresolved problems in each target area. The opportunities for innovation in devising the novel drug delivery systems are still high; with integration of advanced microtechnology, advanced fabrication of biomaterials, and biotechnology, the novel drug delivery is poised to be a promising alternative to the oral administration and hypodermic injection for a large spectrum of drug candidates.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>