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- 저자 : Jongoh Hwang (검색결과 4 건)
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Jeon, Min Soo,Jeon, Yale,Hwang, Jeong Hoon,Heu, Chang Sung,Jin, Sangrak,Shin, Jongoh,Song, Yoseb,Chang Kim, Sun,Cho, Byung-Kwan,Lee, Jung-Kul,Kim, Dong Rip Elsevier 2018 Carbon Vol.130 No.-
<P><B>Abstract</B></P> <P>Here, we demonstrate the fabrication of 3D porous carbon scaffolds with tunable pore sizes that are comparable to the sizes of bacterial cells for their effective confinement. We utilized the sphere template method to fabricate the 3D porous carbon scaffolds with excellent pore arrangements and enlarged interconnected areas among the pores. The proposed 3D porous carbon scaffolds trapped about 40 times higher densities of <I>Escherichia coli</I> DH5α than conventional 3D porous reticulated vitreous carbon (RVC) scaffolds. Moreover, the proposed porous scaffolds effectively restrain the detachment of the attached cells from the scaffolds because of their geometries, thereby maintaining about 75% of the initial cell densities under repeated washing, whereas almost all the cells were washed away from the conventional 3D porous RVC scaffolds. This effective confinement of bacterial cells will assist in significantly improving the performance of cell-based biological applications.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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An Ergonomic Evaluation of an One–Touch System for Shoe Lacing
Kwangae Park,Jangwoon Park,Younggeun Choi,Hyewon Lee,Jongoh Hwang,Heecheon You 대한인간공학회 2012 대한인간공학회 학술대회논문집 Vol.2012 No.11
Background: Ordinary shoes have an inconvenience that the laces should be retied when they are untied, otherwise the wearer could fall down or have a safety accident. Tying shoe laces is especially uncomfortable for seniors and disabled people with difficulty using hands. Objective: Present study validates the ergonomic effects of the one-touch system developed for refining the inconvenience of tying laces and improving prevention of being untied of laces. Method: Validation of the one-touch system has been conducted with eleven seniors, ten disabled people, and ten ordinary adults. They evaluated the one-touch system and the ordinary shoe laces in terms of subjective criteria (overall satisfaction, convenience of use, wearing comfort, securing stability, and motion efficiency) and objective criteria (tying time). Results: The level of overall satisfaction of the one-touch system was 1.6 times higher than ordinary lace shoes where the one-touch system got 6.3 points each from seniors and disabled people, and 5.1 points from ordinary adults while ordinary lace shoes got 3.9 points from seniors, 3.7 points from disabled people, and 3.2 points from ordinary adults. Especially in the group of disabled people and seniors with difficulty using hands, the result of the one-touch system was 1.5 to 4.6 times higher than those of the ordinary lace shoes in terms of convenience of use, securing stability, and motion efficiency. In terms of tying time, buckling the one-touch system shoes took 2.3 to 3.8 times quicker than tying ordinary shoe laces where it took 8.6 seconds for seniors, 11.8 seconds for disabled people, and 6.9 seconds for ordinary adults to tie ordinary shoe laces, while it took 3.2 seconds for seniors, 5.2 seconds for disabled people, 1.8 seconds for ordinary adults to buckle the one-touch system shoes. Conclusion: It was validated that the way of buckling the one-touch system shoes is more satisfactory and efficient than the way of tying the ordinary shoe laces. Application: The one-touch system is highly expected to be applicable to shoes with laces. Moreover, it could be used in product design for seniors and disabled people with difficulty using hands, and children group.
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Development of an infant formula certified reference material for the analysis of organic nutrients
Lee, Joonhee,Kim, Byungjoo,Lee, Sun Young,Choi, Jongoh,Kang, Dukjin,Lee, Hwasim,Choi, KiHwan,Lee, Hyeyoung,Sim, Hee-Jung,Baek, Song-Yee,Lee, Honghee,Hyung, Seok-Won,Ahn, Seonghee,Seo, Dongwon,Hwang, J Applied Science Publishers 2019 Food chemistry Vol.298 No.-
<P><B>Abstract</B></P> <P>Infant formula certified reference material (CRM, KRISS CRM 108-02-003) were developed for the analysis of organic nutrients. The CRM is a milk-based infant formula powder, packaged at 14 g per unit. Ten thousand units were prepared and stored at −70 °C. For the certification of each nutrient, ten units were analyzed for simultaneous value-assignment and homogeneity test. Analytical methods used were isotope dilution mass spectrometry (IDMS) based on liquid chromatography mass spectrometer (LC/MS) or gas chromatography mass spectrometer (GC/MS) as higher-order reference methods.13 vitamins, 3 fatty acids, and total cholesterol were certified. The between-unit relative standard deviation of measurement results for each nutrient ranged 0.2% to 2.5%, showing very good homogeneity. The expanded relative uncertainties of the certified values ranged from 1% to 8%, indicating that they have higher-order metrological quality. The values of proximates (proteins, lipids, carbohydrates, water, and ash) were assigned through inter-laboratory comparisons.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An infant formula CRMs for the analysis of organic nutrients was developed. </LI> <LI> Organic nutrients were certified by IDMS approaches as higher-order reference methods. </LI> <LI> Homogeneities and stability of the CRM were evaluated by IDMS approaches. </LI> <LI> Metrological qualities of the certified values were proved by their small uncertainties. </LI> <LI> Five proximates were value-assigned by interlaboratory comparison. </LI> </UL> </P>
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