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.-

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.

전방경추부 응합술시 단피질 나사못과 양피질 나사못의 비교연구

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

Electron Cyclotron Resonance O_2 Plasma에서 증착한 규소 산화 박막의 특성

안명환,서문석,장재선,서성모,이기방,윤창주,이형재,남기석,최규현,손춘배,김용섭,강석희 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.17 No.-

규소 산화막을 ECR-CVD(electron cyclotron resonance-chemical vapor deposition) 증착방법으로 5인치 기판위에 상온에서 증착하고, 증착공정조건인 증착율, 기판온도, 마이크로파의 세기변화 및 플라즈마 혼합기체의 비에 따른 규소 산화막의 특성을 조사하였다. 또한 산화막의 구조적인 특성을 비교하기 위해 FTIR을 이용하여 ECR-CVD 증착한 산화막, RPE-CVD(remote plasma enhanced-CVD) 증착한 산화막 및 열 산화막의 stretching frequency를 측정하였다. 측정된 결과 ECR-CVD로 증착된 산화막이 구조적인 면에서 열 산화막과 거의 같음을 보였다. ECR-CVD로 증착된 산화막의 전기적인 특성을 전류-전압 및 축전-전압 측정에의하여 분석하였다. 축전된 산화막의 전기적인 특성은 산화막의 전하 밀도는 1×10 exp (11)/㎠이였고, 평균 절연 파괴 전압은 약 6 MV/㎝이다. We have grown thin films of SiO_2 at room temperature by using an ECR-CVD system and have investigated the changes in the properties of the deposited films with changes in the processing conditions such as the deposition rate, the substrate temperature, the microwave power and the plasma gas mixing ratio. We also measured the stretching frequency of three kinds of oxides, and ECR-CVD-grown oxide, a PECVD-grown oxide, and a thermally grown oxide, using FTIR analysis to compare their structural properties. The result shows that the structural properties of the ECR-grown oxide are similar to those of the thermally grown oxide. Additionally, the electrical properties of the ECR-grown oxide were investigated by using current-voltage and capacitance-voltage measurements. These electrical results indicate that the oxide charge density and the average breakdown voltage are 1×10 exp (11) ㎝^-2 and 6 MV/㎝, respectively.

도로주변 낙하분진의 침착속도와 수계환경에 미치는 영향

김환기,송호면,김형훈 全北大學校 附設 都市및環境硏究所 1997 都市 및 環境硏究 Vol.12 No.1

The air pollutants were transported over the long distant by the wind and were deposited to the ground or water surface by the gravitational sedimentation, precipitaion or Brown movement and so on. In this case, the deposited particles might give a bad effect to the water environment, such as eutrophication, damage of aquatic organism. This study was carried out to compare the deposition flux to the 17th national road and Il-San lake, Kyunggi, and to investigate the principal organic components. The deposition flux of 17th national road was 228.2㎎/㎡ day from Feb. to June., and that of Il-San lake was 276.4㎎/㎡ day from Feb., to June. Each components exist in the ratio of COD : T-N : T-P = 100 : 10.8 : 0.9, and the ratio of COD to the VSS is 1.2. The ratio of VSS to TSS was 0.12, the ratio of NH_3-N to T-N was 0.48 and the ratio of PO_4-P to T-P was 0.25. The average deposition velocity was 4.2㎝/s in 17th national road and 4.9 ㎝/s in the Il-San lake. The minimum velocity site was forest at the rate of 1.0㎝/s.

산업부문별 산업재해의 연도별 경향에 관한 연구

안형환 忠州大學校 1999 한국교통대학교 논문집 Vol.34 No.1

In this paper, industry are devided to mining, manufacturing, electricity ·gas · water, transport · storage · communication, construction, and others. In the case of an increasing ratio of deaths, it was showed a pattern that others > constrution > manufacturing > minig > transport · storage · communication > electricity · gas · gas · water. Especially, others and construction showed many better increasing ratio than other. In the case of dangerous degree by industrial department, it was showed a pattern that mining > transport · storage ·communication > construction > electricity · gas ·water > manufacturing > others. Especially, minig was showed very dangerous degree.

산업장의 소음환경에 관한 연구

최형일,박치홍,김종환 조선대학교 환경연구소 1994 環境公害硏究 Vol.11 No.-

This study investigated the noise level and distrbution of sound pressure level over audible frequency range of noise produced at various work sites. The results of the study were as follows 1. Of the total 84 work sites, 50 work sites (59.5%) produced noise exceeding threshold limit value (≥90㏈(A))set by the Ministry of Labor. 2. The frequence analysis of noise produced at the 14 work sites revealed that 7 work sites (50%) had the maximum sound pressure level at high-frequencies greater than 2㎑. 3. By the results of a question paper, 87% of the workers response there is too much noise, 48.6% of them response they appears a masking effect in work sites. 4. The noise induced hearing loss increased in numbers with duration of working.