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Bae, Dongho,Kim, Woo Jung,Jang, In Sook 한국응용생명화학회 2000 Journal of Applied Biological Chemistry (J. Appl. Vol.43 No.2
Biodegradable films were prepared from roasted sesame meal and rice bran. Acetic anhydride, succinic anhydride, and formaldehyde were added to the film-forming solutions, and their effects on tensile strength, percent elongation, water vapor permeability, and water solubility of the films were studied. Roasted sesame meal did not form film without acylation or addition of formaldehyde. Acylated roasted sesame films had higher tensile strength and water-solubility, and lower % elongation than rice bran films. Acylation with acetic and succinic anhydrides increased tensile strength, percent elongation, and water solubility of rice bran films, but decreased water vapor permeability. Treatment with formaldehyde increased tensile strength of roasted sesame and rice bran films and % elongation of rice bran films, while reducing water-solubility of roasted sesame and rice bran films and water vapor permeability of rice bran films.
Properties of quicklime(CaO)-activated Class F fly ash with the use of CaCl<sub>2</sub>
Jeon, Dongho,Yum, Woo Sung,Jeong, Yeonung,Oh, Jae Eun Elsevier 2018 Cement and concrete research Vol.111 No.-
<P><B>Abstract</B></P> <P>This study reports the significant effect of CaCl<SUB>2</SUB> on strength improvement in CaO-activated Class F fly ash system. In these systems, the presence of CaCl<SUB>2</SUB> promotes (1) a higher degree of fly ash dissolution, (2) increasing C-S-H formation, and (3) an overall reduction of pore size and volume, resulting in increased strength. However, while more C-S-H, which is responsible for strength increase, was produced with higher CaCl<SUB>2</SUB> content, extreme doses of CaCl<SUB>2</SUB> resulted in strength degradation; more importantly, the best quantity of CaCl<SUB>2</SUB> for the greatest strength was dependent on the water-to-binder weight ratio (w/b). This dependency was closely related to the formation of calcium oxychloride, which generally causes severe expansive cracking and depends on w/b.</P>
Park, Dongho,Seong, Yeon-Jae,Woo, Hanseung,Yoo, Beomki,Shim, Dain,Kim, Eun Sang,Rha, Dong-wook Elsevier 2019 GAIT AND POSTURE Vol.72 No.-
<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Prior studies have analyzed the activity of the gastrocnemius (GCM) medial and lateral heads as a single unit because it is technically challenging to separately analyze the function of each component <I>in vivo</I>. However, functional variation between the medial and lateral heads is expected due to their anatomical differences.</P> <P><B>Research question</B></P> <P>What is the independent function of the medial GCM? How does paralysis of the GCM medial head affect gait kinematics?.</P> <P><B>Methods</B></P> <P>Twelve healthy adults (two males and ten females; age: 28.2 [±7.72] years) that were scheduled to undergo neurolysis of the tibial nerve branch supplying the medial head of the GCM for aesthetic calf reduction participated in the study. Gait analysis was performed using a computerized opto-electric gait analysis system to measure kinematic data. Surface electromyography (EMG) was recorded simultaneously during the gait analysis. Surface electrodes were placed on seven muscles. Pre-procedure and 1-week and 3-month post-procedure data were compared using a linear mixed model.</P> <P><B>Results</B></P> <P>During level walking, decreased activity of the GCM medial head did not significantly change gait kinematics. However, a significant increase in GCM lateral head and hamstring activities occurred after a branch nerve block to the GCM medial head. During stair ascent, in contrast to level walking, changes in EMG activity only occurred in the GCM medial head, and post-procedure ankle dorsiflexion angles at the end of the terminal-stance phase significantly increased. Ankle plantarflexion angles during the push-off phase were also decreased when compared with pre-procedure values.</P> <P><B>Significance</B></P> <P>The human body response to dysfunction of the GCM medial head depended on the type of locomotion.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Decreased medial GCM activity did not significantly change kinematics during gait. </LI> <LI> Lateral GCM activity significantly increased after nerve block during gait. </LI> <LI> There was a kinematic change during stair ascent. </LI> <LI> There was no compensatory hyperactivities in the lateral GCM during stair ascent. </LI> </UL> </P>
유해화학물질 누출사고시 피해 최소화를 위한 초기대응 연구
서동호(Dongho Seo),이봉우(Bong-woo Lee) 한국위험물학회 2018 한국위험물학회지 Vol.5 No.2
Firefighting is an organization that can respond to complex accidents such as chemical accidents, rapid on-site access in the event of a disaster, and life-saving. Especially, when responding to hazardous substances spill accidents, the firefighting team conducts disaster prevention activities in a way that safety of members and secondary harmful substances do not occur. In this study, we have arranged the on-site response sequence to minimize the damage in case of leakage of toxic chemicals by reviewing the previous research of acidic chemical such as hydrofluoric acid and carrying out experimental of basic chemicals such as ammonia water through neutralization, adsorption and dilution tests. This paper proposes a method of using portable scrubber which can effectively decontaminate toxic gas also.