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안승근,송광엽,박찬운,Ahn, Seung-Geun,Song, Kwang-Yeob,Park, Charn-Woon 대한치과보철학회 1989 대한치과보철학회지 Vol.27 No.2
The purpose of this study was to investigate the mandibular opening and closing movements at mandibular incisor region and clinical rest position in normal subject using the newly developed electric mandibular movement analyzing device, (M.K.G.-K6 diagnostic system, Myo-tronics Inc. Seattle, WA, U.S.A.) The 58 normal subjects, who were students of the College of Dentistry, Chonbuk National University, were selected according to sampling criteria. The obtained results were as follows: 1. There was no significant difference of distribution of opening and closing movement patterns at mandibular incisor region between male and female. There was significant difference between habitual and maximum movement patterns both in sagittal and frontal plane. 2. Although the percentage of distribution of crossover pattern was highest in all cases, but there were significant differences between patterns only at habitual opening and closing movement in sagittal plane. 3. The mean of maximum opening was $47.29{\pm}4.68mm$ in male and $42.15{\pm}4.95mm$ in female. Therefore the mean of maximum opening was larger in male than in female. 4. The mean of maximum laterotrusion in frontal trajectory was larger to the left than to the right. Also the proportion of left deviation at maximum opening position was larger than that of other cases. 5. The mean of maximum opening and closing velocity was higher in male than in female and the mean of closing velocity was higher than that of opening velocity. Also the amount of separation from the centric occlusion was higher in maximum closing velocity than in maximum opening velocity. 6. Clinical rest position was $1.70{\pm}0.99mm$ inferior, $0.74{\pm}0.57mm$ anterior, $0.99{\pm}0.51mm$ right from centric occlusion and the A/V ratio was 1:2.7.
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안승근,강동완,Ahn, Seung-Geun,Kang, Dong-Wan 대한치과보철학회 2000 대한치과보철학회지 Vol.38 No.2
Recently a new generation of crown and bridge veneering resins containing submicron glass fillers was introduced. These ultrasmall particle hybrid composite materials distinguish themselves, compared with conventional microfill crown and bridge resins, through improved mechanical properties. It is claimed that these composites are suitable for metal free crowns and even bridges using fiber reinforcement. The purpose of this study was to evaluate the effect of thermal cycling on the tensile strength of the following veneering composites: Artglass(Heraeus Kulzer Co., Wehrheim, Germany), Estonia(Kuraray Co.. Japan), Sculpture(Jeneric Pentron Co., Wallingford, U.S.A.), and Targis(Ivoclar Co., Schaan Liechenstein). According to manufacturer's instructions, rectangular tensile test specimens measuring $1.5{\times}2.0{\times}4.5mm$ were made using a teflon mold. Whole specimens were divided into two groups. One group was dried in a desiccator at $25^{\circ}C$ for 10 days, and another group was subjected to thermal cycling($10,000{\times}$) in water($5/55^{\circ}C$). All test specimens were placed in a universal testing machine and loaded until fracture with a crosshead speed of 0.5mm/min. Weibull analysis and Tukey's test were used to analyze the data. The fracture surfaces of specimens were observed in SEM and the aliphatic C=C absorbance peak of Estenia and Targis resin was analyzed using Fourier transform infrared(FTIR) spectroscopy. Within the limitations imposed in this study, the following conclusions can be drawn: 1. Both in drying condition and thermal cycling condition, the highest tensile strength was observed in Estenia testing group(p<0.05). 2. The strength data were at to single-mode Weibull distribution, and the Weibull modulus of all veneering composite resin specimens increased after thermal cycling treatment. 3. After thermal cycling test, the highest tensile strength was observed in the Estenia group, and the lowest value was observed in the Targis group. The tensile strength values showed the significant differences between each group(p<0.05) 4. The aliphatic C=C absorbance peak of Estonia and Targis resin was decreased after light curing, and there was no distinct change after thermal cycling.
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안승근,이주형,배태성,Ahn, Seung-Geun,Lee, Ju-Hyung,Bae, Tae-Sung 대한치과보철학회 1996 대한치과보철학회지 Vol.34 No.2
This study was performed to evaluate the fracture toughness of seven commercially available dental ceramics by indentation fracture method. All specimens were fabricated to the final dimensions of approximately 12mm in diameter 2mm in thickness. The characte-ristic indentation dimensions of Vickers or Knoop indentation were measured to calculate the fracture toughness values and Young’s moduli. The results obtained were summarized as follows; 1. Young’s modulus and Vickers hardness of Vita In-Ceram showed the maximum values of $154.4{\pm}49.2$ Gpa and $12.60{\pm}0.71$Gpa, respectively. Results of Scheff test exhibited the significant difference between Vita In-Ceram group and others(p<0.01). 2. Maximum fracture toughness of $2.562{\pm}0.37 MPam^{1/2}$ for Vita In-Ceram and the maxi-mum one of $0.908{\pm}0.132MPam^{1/2}$ for Vitadur-N were calculated. Results of Scheff test showed the significant difference between Vita In-Ceram group and Vita Hi-Ceram(p<0.05) : also between Vita In-Ceram or Vita Hi-Ceram and others(p<0.01). 3. The alumina-based core ceramics showed the aspect of Palmqvist crack for the indentation load of 49.0N, but others showed the median/lateral crack for the indentation load of 9.8N.
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안승근,박종만,송광엽,박찬운 全北大學校 齒醫學硏究所 1989 전북치대논문집 Vol.7 No.1
The purpose of this study was to investigate the mandibular opening and closing movements at mandibular incisor region and clinical rest position in normal subject using the newly developed electric mandibular movement analyzing device, (M.K.G.-K6 diagnostic system, Myo-tronics Inc, Seattle. WA. U.S.A) The 58 normal subjects, who were students of the College of Dentistry, Chonbuk National University, were selected according to sampling criteria. The obtained results were as follows : 1. There was no significant difference of distribution of opening and closing movement patterns at mandibular incisor region between male and female. There was significant difference between habitual and maximum movement patterns both in sagittal and frontal plane. 2. Although the percentage of distribution of crossover pattern was highest in all cases, but there were significant differences between patterns only at habitual opening and closing movement in sagittal plane. 3. The mean of maximum opening was 47.29±4.68㎜ in male and 42.15±4.95㎜ in female. Therefore the mean of maximum opening was larger in male than in female. 4. The mean of maximum laterotrusion in frontal trajectory was larger to the left than to the right. Also the proportion of left deviation at maximum opening position was larger than that of other cases. 5. The mean of maximum opening and closing velocity was higher in male than in female and the mean of closing velocity was higher than that of opening velocity. Also the amount of separation from the centric occlusion was higher in maximum closing velocity than in maximum opening velocity. 6. Clinical rest position was 1.70±0.99㎜ inferior, 0.74±0.57㎜ anterior, 0.99±0.51㎜ right from centric occlusion and the A/V ratio was 1 : 2.7.
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직무자율성이 혁신적 업무행동에 미치는 영향: 자기효능감과 직원몰입의 매개효과
안승근 ( An Seung-geun ),이진구 ( Lee Jin Gu ) 한국인력개발학회 2023 HRD연구 Vol.25 No.4
IT기술의 발달과 더불어 팬데믹 이후 업무수행 방식이 하이브리드 형태로 변화하면서 기업들은 구성원의 직무자율성을 어떻게 성과로 연결할 것인지가 중요한 관심사가 되고 있다. 본 연구는 직무자율성과 혁신적 업무행동의 관계에서 자기효능감과 직원몰입의 매개 효과를 분석하여 종합적으로 규명하고자 하였다. 국내 기업체에 근무하는 직원 300명을 대상으로 데이터를 수집하였고, Mplus 7.4 소프트웨어를 이용하여 구조모형 분석을 실시하였다. 분석 결과, 직원몰입은 직무자율성과 혁신적 업무행동 간의 관계에서 통계적으로 유의미한 매개 역할을 하는 것으로 나타났다. 그러나 자기효능감의 매개효과는 통계적으로 유의하지 않았다. 또한 직무자율성과 혁신적 업무행동의 관계에서 자기효능감과 직원몰입의 순차적 다중 매개효과가 통계적으로 유의미한 것으로 나타났다. 이러한 연구 결과는 확대되는 직무자율성이 자기효능감과 직원몰입 제고로 이어질 수 있도록 조직 차원의 노력이 필요함을 강조하고 있다. 이후 HRD 관점에서 학문적, 실무적 시사점과 향후 연구 방향을 제언하였다. With the development of IT technology and the change of work performance method to hybrid work after the pandemic, companies are becoming an important concern on how to link the job autonomy of their members to performance. It is recognized that job autonomy has a significant impact on employees' innovative work behaviors. This study aimed to provide a comprehensive examination of the relationship between job autonomy and innovative work behavior by analyzing the mediating effects of self-efficacy and employee engagement. In this study, data was collected from 300 employees working in domestic companies, and a structural model analysis was performed using Mplus 7.4 software. As a result of the analysis, employee engagement was found to play a statistically significant mediating role in the process through which job autonomy influences innovative work behavior. However, the mediating effect of self-efficacy was not found to be statistically significant. Additionally, in this study, self-efficacy and employee engagement showed a statistically significant sequential multimediating effect in the process from job autonomy to innovative work behavior. This suggests that self-efficacy and employee engagement act as consecutive mediators in this relationship. Based on these findings, the study underscores the importance of organizational efforts to expand job autonomy, as they can contribute to the enhancement of self-efficacy and employee engagement. The study also suggests academic and practical implications, as well as future research directions, from the perspective of Human Resource Development(HRD).
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