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소결과정에서 Fe_2O_3-CaO-Al_2O_3-SiO_2계로부터 Calcium-Ferrite 생성거동에 미치는 염기도의 영향
黃熙鎭,車榮宰,兪炳敦,韓晶煥,李始衡,許完旭 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.5
The effect of the basicity on the formation behaviour of calcium ferrites was investigated in the sintering process of Fe_2O_3-CaO-Al_2O_3-SiO_2 system. In the system of Fe_2O_3-CaO-Al_2O_3, the mineral structure consists of iron oxide particles and matrix phase, which is likely to be CF(calcium ferrite). When SiO_2 is added into Fe_2O_3-CaO-Al_2O_3 system, the area fraction of CF decreases sharply. When the basicity(CaO/SiO_2) decreases below the unity, CF does not form, and the mineral structure is composed of iron oxide particles and the silicate slag. The iron oxide particles are mainly magnetite in the temperature range higher than 1300℃, while they consist of both magnetite and hematite at the temperatures below 1250℃. When SiO_2 is added into Fe_2O_3-CaO-Al_2O_3 system, the formation of hematite is promoted in the lower temperature range. The increase of SiO_2 content tends to change the composition of CF from hemi-CF to mono-CF. The solubility of solutes such as CaO, Al_2O_3 and SiO_2 in CF increase with the increase of SiO_2 content in the system.
Immunological Grouping of Enterotoxins in S. aureus Isolated from Stool Specimens by PCR
Huh, Jin,Lee, Do Hyun,Whang, Sun Chul,Yoon, Hyo Sook 高麗大學校 倂設 保健大學 保健科學硏究所 1996 保建科學硏究論集 Vol.5 No.1
황색포도상구균이 생성하는 장독소는 식중독과 깊은 관계가 있으며 병원 미생물 영역외에도 가공, 조리, 보존 과정에서 오염되는 경우 심각한 문제가 야기되므로 매우 중요하다. 장독소를 검출하는 방법은 RPLA(Reverse Passive Latex Agglutination)와 같은 면역학적 방법과 세균의 DNA내에 존재하는 유전자의 염기서열을 분석하는 PCR방법이 있다. 후자의 방법은 특이성, 예민성, 신속성과 경제적인 장점이 특징이다. 장독소는 혈청학적으로 SEA, SEB, SEC, SED, SEE로 구분하고 있다. 본 실험은 질환과 관계없이 배양의뢰된 대변을 검체로 1,211례를 매양하여 황색포도상구균 240(19.8%)례를 분리하여 PCR과 약제 감수성 검사를 조사하였다. 장독소 생성율은 104주(43.3%)이며 형별로는 SEA 38주(36.5%), SEB 2주(1.9%), SEC 26주(25.1%), SED 29주(27.9%), SEA+SEC 6주(5.8%), SES+SED 2주(1.9%), SEA+SEB 1주(1.0%)로 나타냈다. 분변이 아닌 다른 검체에서 분리된 50주를 대상으로 나타난 분포는 SEA 17주(53.1%), SEC 14주(43.8%), SEA+SEB 1주(3.1%)를 보이고 있다. 독소생성주 104주 중 MRSA는 51주(49.0%)로 나타났다. Enterotoxin excreted by S. aureus is not only well known as a common cause of food poisoning but also as a key factor in contamination of food processing, cooking and storage. An immunological method such as Reverse Passive Latex Agglutination(RPLA) or a genomic molecular method like PCR is widely used to detect enterotoxins from S. aureus. PCR was found to be advantagenous in specificity, sensitivity, speed and cost effectiveness for the serogrouping of enterotoxins from S. aureus. The enterotoxins are immunologically classified as SEA, SEB, SEC, SED and SEE. We randomly collected a total of 1,211 stool specimens and isolated 240(19.8%) strains of S. aureus by the standard culture and identification method. Those 240 isolates of S. aureus were tested for antimicrobial drug susceptibility, and subjected to PCR for the serogrouping of enterotoxins. The enterotoxins were detected from 104(43.3%) isolates, and classified in 4 single groups and 3 mixed groups. They are 38(36.5%), 29(27.9%), 26(25%) and 2(1.9%) strains in single groups of SEA. SED, SEC and SEB, respectively. The mixed groups were 6(5.8%), 2(1.9%). and 1(1.0%) in SEA+SEC, SEB+SED and SEA+SEB, respectively. The distribution of serogroups of 50 enterotoxins detected from S. aureus other than stool specimens were 17(53.1%), 14(43.8%) and 1(3.1%) strains in SEA, SEC and SEA+SEB, respectively, 51(49.0%) strains among 104 enterotoxin producers were classified as methicillin resistant S. oureus(MRSA).
Huh Jennifer,Whang Claire,Kim Hye-Young 한국마케팅과학회 2023 Journal of Global Fashion Marketing Vol.14 No.1
Voice shopping creates a novel shopping experience as it is prompted by human-AI interaction. It greatly reduces the time required in consumer decision-making, while it could impair consumers’ autonomy. This study thus investigates how the social role of voice assistants and user autonomy affect consumers’ relationships and buying decisions. Using media equation theory, two experimental studies examined the effects of social role and user autonomy on perceived human-likeness, trust, and purchase intention. Study 1 (86 participants) and Study 2 (112 participants) found that perceived human-likeness and trust serially mediated the relationship between user autonomy and purchase intention. This finding contributes to the media equation research by affirming the effectiveness of implicit anthropomorphism processing and highlights the importance of improving consumers’ confidence via voice channels.
[論文] 일괄 풀림처리된 강판의 예비 변형정도에 따른 소열경화 특성
허훈(Hoon Huh),황필상(P. S. Whang) 한국자동차공학회 1990 오토저널 Vol.12 No.1
Bake hardenability of batch annealed steel sheets is investigated in connection with the amount of tensile deformation and the bake hardening condition. This study associates with the method for producing bake hardening materials by means of batch annealing process and for measuring bake hardenability which is not yet fully established. The experimental result demonstrates the relationship between strain distribution and bake hardening behavior in various bake hardening conditions, which provides an essential information for automobile design and related sheet metal forming in a press shop. The result also shows the bake hardenability ofthe tested material increases as the baking temperature is increased froni 150 ℃. The result assures the bake hardening materials can guarantee reasonably high strength as well as good uniformity in yield strength for the automobile body by sheet metal forming process.
Lee, Ik-Choon,Huh, Chul,Koh, Han-Joong,Lee, Hai-Whang Korean Chemical Society 1988 Bulletin of the Korean Chemical Society Vol.9 No.6
Results of kinetic studies on the reactions of benzyl chlorides with anilines and benzylamines are reported. Analyses of the cross interaction constants relevant to the degree of bond formation, ${\rho}_{XY}$ and ${\lambda}_{XY}$, are carried out. The magnitudes of the two parameters indicated that the degree of bond formation in the transition state is the typical of that expected for an $S_N2$ reaction, but the reactions with benzylamines appear to have a slightly less degree of bond formation compared with the reactions with anilines.