• Title/Summary/Keyword: Nam Dae Hee

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Evaluation of High Absorption Photoconductor for Application to Auto Exposure Control Sensor by Screen Printing Method (자동노출제어장치 센서적용을 위한 스크린 프린팅 제작방식의 고흡수율 광도전체 특성평가)

  • Kim, Dae-Kuk;Kim, Kyo-Tae;Park, Jeong-Eun;Hong, Ju-Yeon;Kim, Jin-Seon;Oh, Kyung-Min;Nam, Sang-Hee
    • Journal of the Korean Society of Radiology
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    • v.9 no.2
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    • pp.67-72
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    • 2015
  • In diagnostic radiology, the use of automatic exposure control device is internationally recommended for diagnosis and optimization. However, if exposed to prolonged radiation is a complicated manufacturing process, there is a problem that occurs decrease of various performance overall brightness sensor, which is commercially available conventional. Therefore, in this study, absorption of X-ray is high, and I want to evaluate the AEC applicability of the sensor of the photoconductor-based production has an easy advantage. Experimental results confirms the possibility of fabrication of the sensor through an increase in the SNR, with the detection efficiency superior, accurate turn-off. In addition, it is confirmed that the experimental results of the transmittance and the latent image, Ghost effect by the light conductor does not appear, in the case of a photoconductor with the exception of the PbO, 80% - and it was confirmed good transmittance of 90%. Therefore, excellent mechanical stability and poor performance due to a change of the doping concentration than the existing products that have been put to practical use, the sensor easy photoconductor based, fabrication and can be applied as AEC sensor is expected.

Functional and sensory characteristics of kiwifruit jangachi cured with traditional Korean sauces, doenjang and kochujang (된장과 고추장 키위장아찌의 기능성 및 관능 특성)

  • Lee, Bong Han;Nam, Tae Gyu;Cho, Chi Heung;Cho, Youn-Sup;Kim, Dae-Ok
    • Korean Journal of Food Science and Technology
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    • v.50 no.2
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    • pp.238-243
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    • 2018
  • This study aimed to compare total phenolic, total flavonoid, and vitamin C contents, antioxidant capacities, and sensory characteristics of jangachi made from green kiwifruit (Actinidia deliciosa cv. Hayward) and golden kiwifruit (A. chinensis cv. Hort16A), which were cured with doenjang and kochujang. Golden kiwifruit had higher total phenolic, total flavonoid, and vitamin C contents, and antioxidant capacities than green kiwifruit. Jangachi of both cultivars of kiwifruit had generally higher total phenolic and flavonoid contents, and antioxidant capacities than fresh kiwifruit. Doenjang jangachi of kiwifruit had higher total phenolic contents and antioxidant capacities than kochujang jangachi. Jangachi made from golden kiwifruit cured with kochujang, following pretreatment with sugar solution, had the highest overall quality on sensory evaluation among jangachies tested herein. Together, our findings suggest that kiwifruit jangachi may serve as a good dietary source of phenolics and antioxidants.

Bacterial Community of Natural Dye Wastewater Treatment Facility (천연염색 폐수처리시설의 세균 군집)

  • Hwang, Yeoung Min;Kim, Dae Kuk;Lee, Ji Hee;Baik, Keun Sik;Park, Chul;Seong, Chi Nam
    • Journal of Life Science
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    • v.24 no.4
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    • pp.393-402
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    • 2014
  • Culture-dependent and culture-independent denaturing gradient gel electrophoresis (DGGE) analyses were employed to investigate the bacterial community associated with a natural dye wastewater treatment facility. A total of 104 (influent water, 48 strains; aeration tank, 25; settling tank, 31) bacterial strains were isolated. Based on the 16S rRNA gene sequences comparison analysis, the isolates belonged to four phyla: Proteobacteria, Actinobacteria, Firmicutes, and Bacteriodetes. Seventeen DGGE bands representing dominant taxa in each sample were cloned and partially sequenced. The same four phyla were detected by DGGE fingerprinting. The most dominant taxon retrieved by both methods was the member of the phylum Proteobacteria with Alphaproteobacteria as the predominant class. The bacterial community associated with the natural dye wastewater treatment facility is composed of parasites of animals and plants, decomposers of polysaccharides and dyes, and producers of extracellular polysaccharides.

Chondroprotective Effects of Wogonin in Experimental Models of Osteoarthritis in vitro and in vivo

  • Park, Jin Sung;Lee, Hyun Jae;Lee, Dong Yeong;Jo, Ho Seung;Jeong, Jin Hoon;Kim, Dong Hee;Nam, Dae Cheol;Lee, Choong Jae;Hwang, Sun-Chul
    • Biomolecules & Therapeutics
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    • v.23 no.5
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    • pp.442-448
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    • 2015
  • We evaluated the chondroprotective effects of wogonin by investigating its effects on the gene expression and production of matrix metalloproteinase-3 (MMP-3) in primary cultured rabbit articular chondrocytes, as well as on production of MMP-3 in the rat knee. Rabbit articular chondrocytes were cultured in a monolayer, and RT-PCR was used to measure interleukin-$1{\beta}$ (IL-$1{\beta}$)-induced expression of MMP-3, MMP-1, MMP-13, a disintegrin and metalloproteinase with thrombospondin motifs-4 (ADAMTS-4), and type II collagen. In rabbit articular chondrocytes, the effects of wogonin on IL-$1{\beta}$-induced production and proteolytic activity of MMP-3 were investigated using western blot analysis and casein zymography, respectively. The effect of wogonin on MMP-3 protein production was also examined in vivo. In rabbit articular chondrocytes, wogonin inhibited the expression of MMP-3, MMP-1, MMP-13, and ADAMTS-4, but increased expression of type II collagen. Furthermore, wogonin inhibited the production and proteolytic activity of MMP-3 in vitro, and inhibited production of MMP-3 protein in vivo. These results suggest that wogonin can regulate the gene expression and production of MMP-3, by directly acting on articular chondrocytes.

Development of Biologically Active Compounds from Edible Plant Sources XVI. -Isolation of Sterols from the Aerial Parts of Sajabalssuk (Artemisia herba)- (식용식물자원으로부터 활성물질의 탐색 XVI. -사자발쑥(Artemisia herba)의 전초로부터 sterol 화합물의 분리-)

  • Bang, Myun-Ho;Chung, Hae-Gon;Song, Myoung-Chong;Yoo, Jong-Su;Chung, Sun-A;Lee, Dae-Young;Kim, Se-Young;Jeong, Tae-Sook;Lee, Kyung-Tae;Choi, Myung-Sook;Baek, Nam-In
    • Applied Biological Chemistry
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    • v.49 no.2
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    • pp.140-144
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    • 2006
  • Sajabalssuk (Artemisia herba) was extracted with 80% aqueous MeOH, and the concentrated extract was partitioned with EtOAc, n-BuOH and $H_2O$, successively. From the EtOAc and n-BuOH fractions, four sterols were isolated through the repeated silica gel and ODS column chromatographies. From the results of physico-chemical data including NMR, MS and IR, the chemical structures of the sterols were determined as ${\beta}-sitosterol$ (1), ergosterol peroxide (2), stigmasterol (3) and daucosterol (4). They were the first to be isolated from Sajabalssuk (Artemisia herba).

A Study on the Method for Ecological Restoration on Abandoned Concrete-paved Road - Focused on the Experimental Construction Site in Young Dong Province of GyungBu Express Highway(227.24~229.04km) - (콘크리트 폐도의 생태복원 방안 모색에 관한 연구 - 경부선 영동군 황간지역 시험시공지를 중심으로(경부고속도로 227.24~229.04km 지점) -)

  • Kim, Nam Choon;Ann, Phil Gun;No, Su Dae;Kim, Do Hee
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.15 no.4
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    • pp.119-132
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    • 2012
  • The unmanaged abandoned concrete roads are vulnerable toward the issues on soil and water pollution, which requires flexible managing method such as eco-corridor after the process of ecological restoration. Among various alternations of abandoned concrete-paved roads, ecological restoration technique may be the most suitable method in sites including high quality of natural environment. Therefore, as in Young dong province, GyungBu express highway (227.24~229.04km), which is near to Hwang-gan IC, the survey to measure its effect of soil under the paving and water pollution by abandoned concrete roads was discussed. Then, the restoration method of plantings of landscape trees and hydro-seeding methods of artificial soil media was appraised through consecutive monitoring. The soil adequacy analysis shows lower percentage of heavy metal substance in each depth level compared to standard limit stated by the Ministry of Environment, along with low concerns raised after the analysis on heavy metal content of the spilled water on the concrete roads. Meanwhile, Korean Weigela (Weigela subsessilis L.H. Baily) was found to be withered in small-scale landscape trees planting sites. Among the seeding plants. the family of leguminosae, Silene armeria, Dendranthema boreale, Caryopteris incana and Aster yomena show good establishment results. Overall studies on planting of small and large landscape trees, planting method of container plants, planting method of ground cover plants, and germination and development trend of seeding plants of the experimental restoration site on abandoned concrete roads are revealing specific trends in the way landscape woody plants establishment and growth. Finally, this study suggests further studies and survey on varied plant restoration methods on abandoned concrete-roads for developed design guidelines of their methods.

Evaluation on Efficacies of Sodium Hypochlorite and Benzalkonium Chloride against Listeria monocytogenes and Salmonella spp. (Listeria monocytogenes와 Salmonella spp.에 대한 Sodium Hypochlorite 및 Benzalkonium Chloride의 유효성 평가)

  • Kim, Hyung-Il;Yoon, Hae-Jung;Choi, Hyun-Cheol;Jeon, Dae-Hoon;Eom, Mi-Ok;Sung, Jun-Hyun;Park, Na-Young;Won, Sun-Ah;Kim, Nam-Hee;Sung, Deok-Wha;Kwak, Hyo-Sun;Kwon, Ki-Sung;Lee, Young-Ja
    • Journal of Food Hygiene and Safety
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    • v.22 no.2
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    • pp.132-136
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    • 2007
  • Disinfectants/sanitizers, showing the bactericidal activity of $5log_{10}$ reduction against E. coli ATCC 10536 and Staphylococcus aureus ATCC 6538 used far assessing disinfectants/sanitizers efficacies, were examined whether showing similar efficacies against Salmonella spp. and Listeria monocytogenes, the major food poisoning bacteria, isolated from foods in current Korean market. The bactericidal efficacies on sodium hypochlorite and benzalkonium chloride were assessed by quantitative suspension tests in both 'clean' and 'dirty' conditions, respectively. Test organisms were consisted of E. coli ATCC 10536, Staphylococcus aureus ATCC 6538, Salmonella typhimurium ATCC 13311, Salmonella Enteritidis ATCC 13076, Listeria monocytogenes ATCC 19111, 10 kinds of Salmonella spp. from foods, and 11 kinds of Listeria monocytogenes from foods. More than $5log_{10}$ reduction in viable count for all strains was only achieved with benzalkonium chloride at the tolerance exemption concentration under dirty conditions. However, all strains were achieved more than $5log_{10}$ reduction under clean conditions.

Measurement of Mechanical and Physical Properties of Pepper for Particle Behavior Analysis

  • Nam, Ju-Seok;Byun, Jun-Hee;Kim, Tae-Hyeong;Kim, Myoung-Ho;Kim, Dae-Cheol
    • Journal of Biosystems Engineering
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    • v.43 no.3
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    • pp.173-184
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    • 2018
  • Purpose: This study was conducted to investigate the mechanical and physical properties of a Korean red pepper variety for particle behavior analysis. Methods: Poisson's ratio, modulus of elasticity, shear modulus, density, coefficient of restitution, and coefficient of friction were derived for "AR Legend," which is a domestic pepper variety. The modulus of elasticity and Poisson's ratio were measured through a compression test using a texture analyzer. The shear modulus was calculated from the modulus of elasticity and Poisson's ratio. The density was measured using a water pycnometer method. The coefficient of restitution was measured using a collision test, and the static and dynamic friction coefficients were measured using a inclined plane test. Each test was repeated 3-5 times except for density measurement, and the results were analyzed using mean values. Results: Poisson's ratios for the pepper fruit and pepper stem were 0.295 and 0.291, respectively. Elastic moduli of the pepper fruit and pepper stem were $1.152{\times}10^7Pa$ and $3.295{\times}10^7Pa$, respectively, and the shear moduli of the pepper fruit and pepper stem were $4.624{\times}10^6Pa$ and $1.276{\times}10^7Pa$, respectively. The density of the pepper fruit and the pepper stem were $601.8kg/m^3$ and $980.4kg/m^3$, respectively. The restitution coefficients between pepper fruits, pepper stems, a pepper fruit and a pepper stem, a pepper fruit and plastic, and a pepper stem and plastic were 0.383, 0.218, 0.277, 0.399, and 0.148, respectively. The coefficients of static friction between pepper fruits, pepper stems, a pepper fruit and a pepper stem, a pepper fruit and plastic, and a pepper stem and plastic were 0.455, 0.332, 0.306, 0.364, and 0.404, respectively. The coefficients of dynamic friction between a pepper fruit and plastic and a pepper stem and plastic were 0.043 and 0.034, respectively.

Studies on the Gemini Type Amphipathic Surfactant(5) - Preparation and Properties of Double Chain Surfactant with Two Sulfonate Groups Derived from N-Acyldiethanolamines - (제미니형 양친매성 계면활성제에 관한 연구(제5보) - 함질소 장쇄아실디에탄올아민으로부터 유도된 두 개의 술폰산 염기를 갖는 화합물의 합성 및 계면특성 -)

  • Yun, Young-Kyun;Jeong, Hwan-Kyeong;Jeong, Noh-Hee;Nam, Ki-Dae
    • Applied Chemistry for Engineering
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    • v.9 no.4
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    • pp.565-568
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    • 1998
  • Amphipathic compounds (bis-sulfonate Gemini type) with double or triple long chain alkyl groups were prepared by the reaction of N-(long chain acyl)diethanolamine diglycidyl ethers with fatty alcohols, followed by the reaction with propanesultone. All these new Gemini type surfactants were soluble in water and showed much better micelle forming ability and lowering surface tension than sodium dodecyl sulfonate with one sulfonate group. cmc and ${\Upsilon}$ cmc values of the triple-chain compounds were still much smaller than those of the corresponding double-chain compounds with two common alkyl groups. The efficiency of adsorption at the water/air interface ($pC_{20}$) of these surfactants was very high. Their foaming properties, wetting ability toward a felt chip, and lime-soap dispersing requirement (LSDR) were measured. Their initial foaming properties were high but showed good low foam stability, wettability and LSDR.

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Microstructures and Magnetic Properties of Multiferroic BiFeO3 Thin Films Deposited by RF Magnetron Sputtering Method (RF 마그네트론 스퍼터링법으로 증착된 Multiferroic BiFeO3 박막의 미세구조 및 자기적 특성)

  • Song, Jong-Han;Nam, Joong-Hee;Kang, Dae-Sik;Cho, Jung-Ho;Kim, Byung-Ik;Choi, Duck-Kyun;Chun, Myoung-Pyo
    • Journal of the Korean Magnetics Society
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    • v.20 no.6
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    • pp.222-227
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    • 2010
  • $BiFeO_3$ (BFO) thin films were deposited on Pt/Ti/$SiO_2$/Si(100) substrates by RF magnetron sputtering method at room temperature. The influence of the flow rate of $O_2$ gas on the preparation of $BiFeO_3$ thin films was studied. XRD results indicate that the $BiFeO_3$ thin films were crystallized to the perovskite structure with the presence of small amount of impurity phases. The flow rate of $O_2$ gas has great affect on the microstructures and magnetic properties of $BiFeO_3$ thin films. As flow rate of $O_2$ gas increased, roughness and grain size of the thin films increased. $BiFeO_3$ thin films exhibited weak ferromagnetic behavior at room temperature. The PFM images revealed correlation between the surface morphology and the piezoresponse, indicating that the piezoelectric coefficient is related to microstructure.