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Park, Minjoon,Do, Kyungsik,Kim, Jaemin,Son, Donghee,Koo, Ja Hoon,Park, Jinkyung,Song, Jun-Kyul,Kim, Ji Hoon,Lee, Minbaek,Hyeon, Taeghwan,Kim, Dae-Hyeong Wiley (John WileySons) 2015 Advanced healthcare materials Vol.4 No.7
<P>Oxide nanomembrane hybrids with enhanced mechano- and thermo-sensitivity for semitransparent epidermal electronics are developed. The use of nanomaterials (single wall nanotubes and silver nanoparticles) embedded in the oxide nanomembranes significantly enhances mechanical and thermal sensitivities. These mechanical and thermal sensors are utilized in wheelchair control and hypothermia detection, which are useful for patients with strokes.</P>
Eco-Design of a Wastewater Treatment System Based on Process Integration
Park, Donghee,Lee, Dae Sung,Lim, Seong-Rin American Chemical Society 2013 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.52 No.6
<P>Because almost all industrial plants have wastewater treatment systems, eco-design of the systems is an effective way to reduce environmental impacts and economic costs of industry sectors. The eco-design using biobjective optimization has, however, a limitation due to the subjective weighting on the two objectives. The objective of this study is to eco-design existing wastewater treatment systems based on process integration by converting biobjective to single objective problems. For the mathematical optimization model, an objective function is formulated by monetizing environmental impacts to external costs and summing the external and economic costs. Mass balances and constraints are formulated to reflect the superstructure model and real situations. Two case studies are performed to verify the developed model. The eco-design outcomes are compared to their respective economic cost- and environmental impact-minimized designs. This comparison shows that the developed model optimizes the trade-offs between the biobjectives. This study can be applied to reduce environmental impacts and economic costs of other process systems.</P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie3018934'>ACS Electronic Supporting Info</A></P>
A study of solubilization of sewage sludge by hydrothermal treatment
Park, Munsik,Kim, Namgyu,Lee, Sunkyung,Yeon, Seungjae,Seo, Ji Hae,Park, Donghee Academic Press 2019 Journal of Environmental Management Vol. No.
<P><B>Abstract</B></P> <P>The use of activated sludge process for biological treatment of domestic and industrial wastewaters generates large amounts of sewage sludge, which is regarded as problematic biowaste. Conventional waste treatment methods such as landfilling and ocean pumping have been used to dispose the unwanted sludge, but this practice is no longer recommended due to serious secondary pollution and strict environmental regulations. Hydrothermal treatment represents a promising alternative that has attracted attention in recent years. In this study, batch experiments of hydrothermal treatment of domestic sewage sludge were conducted under varying conditions (temperature of 150–300 °C, reaction time of 0.5–3.0 h, and sludge concentration of 5–30 g/L). A statistical study of the responses, including disintegration degree and concentration of dissolved compounds, was performed using a response surface methodology. Optimal conditions for hydrothermal treatment of sewage sludge were obtained through mathematical modeling.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hydrothermal method was used for the treatment of domestic sewage sludge. </LI> <LI> Effects of temperature, reaction time and sludge dosage were examined. </LI> <LI> Response surface methodology was used for statistical and empirical study. </LI> <LI> Hydrothermal condition for both sludge reduction and solubilization was optimized. </LI> </UL> </P>
Park, Mi Jung,Jo, Ji Hye,Park, Donghee,Lee, Dae Sung,Park, Jong Moon Elsevier 2010 International journal of hydrogen energy Vol.35 No.12
<P><B>Abstract</B></P><P>Two-stage anaerobic digestion process has been frequently applied to the sequential production of hydrogen and methane from various organic substrates/wastes. In this study, a cost-effective byproduct of food industry, molasses, was used as a sole carbon source for the two-stage biogas-producing process. The two-stage process consisted of two reactor parts named as the first-stage hydrogenic reactor (HR) operated at pH 5.5 and 35°C and the second-stage methanogenic reactor (MR) at pH 7.0 and 35°C. Microbial community analysis revealed that <I>Clostridium butyricum</I> was the major hydrogen-producing bacteria and methanogens consisted of hydrotrophic bacteria like <I>Methanobacterium beijingense</I> and acetotrophic bacteria like <I>Methanothrix soehngenii</I>. In the first-stage process, hydrogen could be efficiently produced from diluted molasses with the highest production rate of 2.8 (±0.22) L-H<SUB>2</SUB>/L-reactor/d at the optimum HRT of 6 h. In the second-stage process, methane could be also produced from residual sugars and VFAs with a production rate of 1.48 (±0.09) L-CH<SUB>4</SUB>/L-reactor/d at the optimum HRT of 6 d, at which overall COD removal efficiency of the two-stage process was determined to be 79.8%. Finally, economic assessment supported that cost-effective molasses was a potent carbon source for the sequential production of hydrogen and methane by two-stage anaerobic digestion process.</P>
Patellofemoral contact mechanics after transposition of tibial tuberosity in dogs
Donghee Park,Jin-su Kang,Namsoo Kim,Suyoung Heo 대한수의학회 2020 Journal of Veterinary Science Vol.21 No.4
Background: Tibial tuberosity transposition (TTT) causes caudalization of the patellar ligament insertion in canine medial patellar luxation, which can lead to increases in patellofemoral contact pressure. Objectives: The purpose of this study is to confirm the effect of patellofemoral contact mechanics after craniolateral and caudolateral transposition of tibial tuberosity in normal canine hindlimbs. Methods: Craniolateral and caudolateral transposition of tibial tuberosity was performed in 5 specimens, respectively. The pressure was measured in the specimen before TTT, and then in the same specimen after TTT. In this process, data was obtained in 10 specimens. The measurement results were output as visualization data through the manufacturer's software and numerical data through spreadsheet. Based on these 2 data and the anatomical structure of the patellofemoral joint (PFJ) surface, whole measurement area was analysed by dividing into medial, lateral and central area. Results: In craniolateralization of tibial tuberosity, total, medial, central contact pressure was decreased and lateral contact pressure was not statistically changed lateral contact pressure than normal PFJ. In caudolateralization of tibial tuberosity, total, lateral contact pressure was increased and medial contact pressure was not statistically changed than normal PFJ. Although not statistically significant changed, central contact pressure in caudolateralization of tibial tuberosity was increased in all 5 specimens. Conclusions: These results imply that traditional TTT, prone to caudal shift of patellar tendon, can increase retropatellar pressure may lead to various complications and diseases of the stifle joint.