Comparison of the Crystallization Behavior of Silica Between Mg and Al‑Phosphate Used in Tension Coatings of Grain‑Oriented Electrical Steel

Hyung‑Ki Park,Min‑Soo Han,Chang‑Hwan Chang,Jong‑Tae Park,박창수,Hyung‑Don Joo 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.3

The effect of the phosphate component on the thermal stability of tension coatings was investigated with a focus on thecrystallization behavior of amorphous silica in the tension coating. After stress-relief annealing, core loss of samples coatedwith a Mg-phosphate was improved, while that coated with an Al-phosphate was deteriorated. The domain wall spacing ofthe samples coated with Mg- and Al-phosphates was respectively increased and decreased after stress relief annealing. Thismeans that the stress relief annealing did not much diminish the tensile stress for Mg-phosphate coating but much diminishedthe tensile stress for Al-phosphate coating. Based on FTIR and XRD results, we found that the crystallization temperatureof silica with Al-phosphate was lower than that of silica with Mg-phosphate. The crystallization of silica was accompaniedby an abrupt volume change, which formed cracks in the tension coating and deteriorated the tensile stress.

중소기업 재직자의 자기결정성이 혁신행동에 미치는 영향: 커뮤니케이션 역량과 지식공유의 매개효과

황순형(Hwang, Soon-Hyung),현병환(Hyun, Byung-Hwan) 한국경영교육학회 2020 경영교육연구 Vol.35 No.6

[연구목적] 중소기업의 생존에 있어 혁신성과를 창출은 필수적이며, 가용자원이 충분하지 않은 중소기업에 있어 인적자원은 중요 요소이다. 이에 본 연구에서는 선행연구와 달리 중소기업 조직구성원의 인식을 중심으로 자기결정성과 커뮤니케이션 역량, 지식공유 및 혁신행동 간의 구조적 관계에 대해 살펴보고자 한다. [연구방법] 연구대상은 중소기업 재직자를 대상으로 실시한 402부의 설문을 바탕으로 통계분석 패키지 SPSS 21.0과 Smart PLS 2.0을 사용하여 실증 분석하였다. [연구결과] 중소기업 조직구성원의 커뮤니케이션 역량 및 지식공유에 대한 인식이 자기결정성과 혁신행동 간의 영향 관계에 대한 분석결과는 다음과 같다. 첫째, 자기결정성과 커뮤니케이션 역량은 지식공유에 긍정적인 영향을 미친다. 또한 자기결정성은 커뮤니케이션 역량에 긍정적인 영향을 미친다. 둘째, 자기결정성, 커뮤니케이션 역량, 지식공유은 혁신행동에 긍정적인 영향을 미친다. 셋째, 자기결정성과 혁신행동 간의 관계에서 커뮤니케이션 역량과 지식공유은 각각 매개효과와 함께 다중매개효과를 가지는 것으로 나타났다. [연구의 시사점] 중소기업에 있어, 커뮤니케이션 역량을 높이는 것이 조직구성원들의 혁신행동을 높이는데 효과적일 것이다. 또한 이미 커뮤니케이션 역량이 높은 기업의 경우에는 지식공유를 높이는 것은 비효과적일 것이다. [Purpose] This study examines the structural relationship between Self -Determination and Communication Competences, Knowledge Sharing, and Innovative Behavior. [Methodology] The survey was conducted on members of small and medium-sized organizations. and the sample of 402 copies was demonstrated with SPSS 21.0 and Smart PLS 2.0 [Findings] First, the results indicate that Self-Determination and Communication Competences have positive effects on Knowledge Sharing. Also, Self-Determination has positive effects on Communication Competences. Second. the results indicate that Self-Determination, Communication Competences and Knowledge Sharing have positive effects on Innovative Behavior. Third, in the relationship Self-Determination and Innovative Behavior, it was shown that Communication Competences and Knowledge Sharing had mediation and multiple mediation effects, respectively. [Implications] For small businesses, enhancing Communication Competences will be effective in enhancing the innovative behavior of the members of the organization. In addition, it would be ineffective to increase Knowledge Sharing for entities that already have high Communication Competences.

The prediction of the tooth size in the mixed dentition for Korean

Moon, Sung-Hwan,Kim, Seong-Oh,Yu, Hyung-Seong,Choi, Byung-Jai,Choi, Hyung-Jun,Lee, Jae-Ho 大韓小兒齒科學會 2006 大韓小兒齒科學會誌 Vol.33 No.2

이번 연구의 목적은 혼합치열기 아동에서 미맹출된 견치와 소구치의 크기를 예측하는데 있어서 한국인에 맞는 방정식을 만들기 위함이다. 미맹출 치아의 크기를 예측하는 것은 혼합치열기 교정 진단과 치료계획 수립에 있어서 매우 중요하다. 미맹출된 견치와 소구치 크기를 예측하는 방법은 몇가지가 있지만 그중에서도 가장 흔하게 쓰이는 것이 모이어의 예측표와 다나카와 존스턴의 방정식이 있다. 하지만 그것들은 백인을 위해서 제작된 것이고 치아 크기는 인종에 따라서 다르다고 알려져 있다. 이번 연구에서는 치아크기를 측정하여 하악 영구 절치의 크기 합과 견치 및 소구치의 크기 합 사이의 상관관계를 구하고 회귀방정식을 이용해서 한국인에 맞는 예측표를 만들었다. 연세대학교 치과대학에 재학중인 178명의 한국 학생(남 108명, 여 70명, 평균연령 21.63)을 대상으로 실험하였다. 영구치의 근원심 폭경을 석고모형상에서 calipers를 이용해서 측정하였다. 성별간의 치아 크기는 차이가 있었다(p<0.05). Correlation coefficient는 0.57에서 0.64의 범위였고, standard errors of the estimates 는 여성에서 0.6으로써 남성보다 우수하였다. r^(2)값은 0.27에서 0.41의 범위를 나타내었다. Estimating the size of unerupted teeth is an essential aspect of orthodontic diagnosis and treatment planning in the mixed dentition. Several methods were introduced and used for the prediction. The most common methods among these would be Moyers probability chart and Tanaka and Johnston equations. These are currently used widely, but they were developed for Caucasians. Because there are clear racial differences in teeth size, the objectives of this study were to produce correlation coefficients between the combined mesiodistal widths of the permanent mandibular incisors and those of the canines and premolars for each quadrant, and prediction tables with regression equations, specifically for Korean. 178 young adults (70 women, 108 men, mean age 21.63 years) were selected from the College of Dentistry, Yonsei University, Seoul, Korea. The mesiodistal crown diameters of the permanent teeth were measured with calipers. Significant sexual dimorphism was found in tooth sizes. The correlation coefficients between the total mesiodistal width of the mandibular permanent incisors and those of the maxillary and mandibular canines and premolars were found to be between 0.52 and 0.64. The standard error of the estimatation was better (0.60) for women and the r^(2) values ranged from 0.27 to 0.41 for both sexes, Prediction tables were prepared for Korean. This study showed larger canine and premolar diameters than Tanaka and Johnston's and Moyers' studies which might be due to the racial differences. Further investigations with a larger sample size will be needed for more representative data on the Korean population.

Gelation에 의한 방사성 금속염화물의 안정화/고정화 : Part2: 알칼리 금속염화물과 이성분계(Si-P)와의 겔화반응 Part2: Gelation with alkali metal chloride in binary system(SiO2/P2O5)

김인태,박환서,김환영,유재형,김준형 한국공업화학회 2002 응용화학 Vol.6 No.2

By gelation with sodium silicate and phosphorous oxide in binary system, we investigated the possibility to fix the volatile alkali metal chlorides in a highly stable matrix at high temperature if the product gel is further solidified to form glass or ceramic waste form. The binary system with different metal chloride(MCl) loadings underwent gelation reaction at 70℃ for 1 day and dried at 110℃ for 1 day. XRD analysis showed that all the dried gel contained NaCl and some unknown crystalline phase. From the experimental results, the reaction mechanism can be proposed as follows. Also, the possibility of Cs vaporization could be lowered by the application of the new gel-route stabilization/solidification to treat waste salt. (G,Na)+MCl→(G,M)+NaCl, (G.H)+MCI→(G,M)+HCl.

金絲埋沒이 白鼠의 腎臟機能에 미치는 影響에 ?한 ?驗的 硏究

李相完,李潤浩,金昌煥,高炳均 慶熙大學校韓醫科大學韓醫學硏究所 1980 慶熙韓醫大論文集 Vol.3 No.-

전방경추부 응합술시 단피질 나사못과 양피질 나사못의 비교연구

박형천,윤승환,박현선,김은영 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.5

산업재해의 연도별 경향에 관한 연구

안형환 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.1

In this paper, we observed a pattern on number in statistical resorce. Especially, we investigated number of accidents, persons suffered and deaths from 1974. Number of accidents and persons suffered was decreased from 1985, but number of deaths was increased at all years. In the case of deaths, it was not show increase or decrease to ratio of deaths at 10,000 persons of employee. We obtained result in which number of majour industrial accidents is increasing by recent.

비스(트리메틸실릴메틸)메톡시비닐실란의 합성

오형식,장주환 木浦大學校 基礎科學硏究所 1994 基礎科學硏究誌 Vol.12 No.-

비스(트리메틸실릴메틸)디클로로실란은 구리와 카드뮴을 각각 촉매와 조촉미로 사용하어 320 ℃에서 클로로메틸트리메틸실란을 금속규소와 직접반응에 제조하였다. 비스(트리메틸실릴메틸)디클로로실란을 메틸알콜과 반응시켜 비스(트리메틸실릴메틸)클로로메톡시실란을 합성하였고, 이를 비닐 그리냐르시약과 반응시켜 비스(트리메틸실릴메틸)메톡시비닐실란을 합성하였다. Bis(trimethylsilylmethyl)dichlorosilane has been prepared in 71% yield by the direct synthesis of α-chloromethylsilanes with metallic silicon in the presence of copper catalyst and cadmium cocatalyst using a spiral band agitator at the carefully controled temperature at 320℃ and we prepared the bis(trimethylsilymethyl)methoxyvinylsilane prepared by Grignard reaction in 63% yield.

수직 점프의 충격량에 따른 신체 질량 중심 변화

박형하,오정환 釜慶大學校 1996 釜慶大學校 論文集 Vol.1 No.2

The goal of the study is to mechanical analysis of the vertical jump performance, the subjects were college student the conclusions obtained from this study as follows ; 1. At the vertical jump, maximal reach height of center of body-mass was the hightest at used the both arm. 2. The impulse of take off, impulse-time and the time of reached maximal impulse were the greatest and longest than any condition.

양이온 선택성 흡착제의 개발

안형환 충주대 산업과학기술연구소 1996 産業科學論文集 Vol.4 No.-

To study properties of cation exchange resins, we produced sulfonic acid-type-strong-acid cation exchange resins (Na-type) and carboxylic acid-type-weak-acid cation exchange resins(Na-type) as making use of styrene and methylmethacrylate for a cross- linker. Because adsorption and removal of Ca2+, Mg2+ make possible in a mock brine we com-pared and estimated adsorption and desorption capacity of Ca2+, Mga2+in the resins. the adsorption capacity of Ca+, Mg2+ion changed as the composition of azobisoisobutyronitrile (AIBN), Isooctane, polyvinylalcohol(PVA), and Crosslinking degree. It was concluded that the effect of the adsorption weight of AIBN was improved with increase of the quantity of AIBN in Ca2+ion, but that was better with decrease the quantity of AIBN in Mg2+1ion, and the adsorption weight of Mg2+ion was improved with increase of the volume of PVA in Mg2+ion, and the effect of temperature was improved with increase of temperature in Ca2+, and Mg2+ion, and optimum crosslinking degree was 8wt%. The effect of the compostion of Isooctane on the adsorption weight of Mg2+ion was improved with decrease of the quantity of Isooctane, the desorption rate of Ca2+, Mg2+ion was 100%, after thirty minutes.