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FDM에서 경사면의 표면과 면적오차법의 관계에 대한 연구
전재억,정진서,황영모,김수광,김준안,계중읍,하만경 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
In any rapid prototyping process, the layer by layer building process introduces an area error between the staircase and the surface line specified by the computer-aided design model. This affects the dimensional accuracy as well as the surface finish for different part build orientations. This paper describes a methodology for computing the area error for any orientation of the part built by the fused deposition modelling system. This technique can be applied to determine the best build orientation of the part, based on the minimum area error. This technique is verified by comparing the results with the experimental measurements of the area error of the parts built at different orientations.
김준영,김진우,조경모,박세희 大韓齒科保存學會 2012 Restorative Dentistry & Endodontics Vol.37 No.2
Objectives: This study aimed to evaluate the relationship between the cyclic fatigue of a K3 file and internal stress intentionally induced until the activation of the auto-stop function of the torque-controlled motor. Materials and Methods: K3 (Sybron Endo) .04 and .06 taper, size 25, 30, 35, 40 and 45 were used in this study. To give the internal stress, the K3 files were put into the .02 taper Endo-Training-Bloc (Dentsply Maillefer until the activation of the auto-stop function of the torque-controlled motor. The rotation speed was 300 rpm and torque value was 1.0 N·cm. K3 were grouped by the number of induced internal stress and randomly distributed to 4 experimental groups (n = 10, Stress 0 [control], Stress 1, Stress 2 and Stress 3). For measuring the cyclic fatigue failure, the K3 files were worked against a sloped glass block and time for file separation was recorded. Data was statistically analyzed Statistical analyses were performed using two-way ANOVA and Duncan post-hoc test at p < 0.05 level. Results: Except .04 taper size 30 in Stress 1 group, there were statistically significant differences in time for file separation between control and all experimental groups. K3 with .04 taper showed higher cyclic fatigue resistance than those of .06 taper. Conclusion: In the limitation of this study, the cyclic fatigue of the K3 file was influenced by the accumulated internal stress from use until the auto-stop function was activated by the torque-controlled motor. Therefore, clinicians should avoid the reuse of the K3 file that has undergone auto-stops. (Restor Dent Endod 2012;37(2):74-78)
인공지능 시스템을 이용한 효율적인 교육용 시스템의 구현
김준모 기전여자대학 1998 論文集 Vol.18 No.-
A.I's application part is expert system, CAI, voice understanding system, natural language, Intelligent robot. But it has hard problem to develop the ICAI. Also it has many problems that ICAI is difficult to adjust for other system. Because of that reason, this study provides several efficient way to overcome the conventional problems about next. First, it develop the Knowledge Base to adapt all system. Second, it develop the knoledge depend on the student model. Third, it sugest the teaching module according to knowledge level of student. Fourth, it sugest efficent software tool for education using hypermedia or multimedia interface.
김준모 기전여자대학 1997 論文集 Vol.17 No.-
기존의 객체 지향 테이터 모델에서의 관계성을 확장한 새로운 객체 지향의 데이터 모델을 제시 한다. 이와 같은 모델 설정을 위해 인덱싱 클래스를 도입하였으며, 이 클래스들을 연산하기위한 인덱싱 연산 클래스를 설계하였다. 또한, 확장된 객체 지향의 데이터 모델하에서 정보의 검색과 변경을 위한 질의어 형식을 제시하였고, 이를 처리하기 위한 모듈을 설계 하였다.
이전제,김광모,한재수,김재건 한국목재공학회 2003 목재공학 Vol.31 No.5
본 연구에서는 몇 가지 새로운 집성재 단면구성 방법을 제안하고, 국산 낙엽송과 합판으로 제조된 집성재의 휨시험을 통해 단면 구성에 따른 집성재의 침성능을 평가 비교하였다. 수평적층(BH), 수직적층(BH), 수직으로 합판보강된 수직적층(BVV)과 수평으로 합판보강된 수직적층(BVH)의 총 네가지 형태의 단면구성 방법에 대하여 실험을 실시하였다. 파괴모드를 관찰하고, 실험을 통해 얻어진 하중-변형 곡선으로부터 MOR 및 MOE를 계산하여 이를 바탕으로 각 단면구성 방법의 휨성능 개선효과를 비교하였다. MOR의 경우에는 결함의 분산으로 인해 수직적층에서 수평적층에 비해 23% 정도의 개선효과를 얻을 수 있었으나, MOE의 경우에는 거의 유사한 값을 나타내었다. 수평으로 합판보강된 경우에는 상대적으로 휨성능이 약한 합판이 사용됨에 따라 MOE가 15% 정도 감소하였으나, 수직으로 합판보강된 경우에는 합판이 사용되었음에도 불구하고 MOE의 감소 없이 MOR이 개선되는 효과를 나타내었는데 이는 전단보강의 효과로 생각되며 이러한 효과를 파괴모드의 관찰을 통해서도 확인하였다. 이상의 결과로부터 집성보의 단면 구성시 라미나의 적절한 배치 및 전단보강 등을 통하여 전체적인 휨성능을 향상시킬 수 있음을 확인하였다. In this paper, bending capacities of glulams with different configurations of cross-section were evaluated. These configurations included horizontal(BH), vertical(BVN), vertical with vertical plywood(BVV) and vertical combination of lamination with horizontal plywood(BVH). Full-scale bending tests were performed to investigate the effect of different section configurations on bending strength(MOR) and stiffness(MOE) of glulam. Compared with type BH, MOR of glulam with type BVN configuration was improved about 23%, which was considered to be caused by defect dispersion effect, while MOE of glulams with these two types of configurations were similar. Because MOE of plywood is generally smaller than that of solid wood laminar, MOE of type BVH glulam decreased about 15%, but in the case of type BVV glulam, MOE was improved without any reduction of MOE. The reason of this result could be undersood in the view of shear-reinforcement effect, which was verified from analysis of fracture mode. From the results of this study, it was concluded that bending capacity of glulam could be improved by proper section design, such as laminar arrangement and shear reinforcement.
이전제,김광모 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
The main purpose of this study is the development of potable CT systems which can be used to evaluate the structural safety of member in ancient wood buildings. Many researches about non-destructive evaluation(NDE) of wood have been performed. But most of these researches were focused on inspection of wood whether it had some deteriorated parts or not. In this study, CT systems were developed for quantitative detection of wood deterioration. And, the developed systems were composed of portable devices to apply for ancient wood buildings in field. Ultrasonic wave and X -ray CT methods were considered. And 5 circular shape specimens were tested for verification of developed methods. Over 23mm defects could be detected by ultrasonic CT method, but the size, shape and position did not agree with prototype. When same specimens were tested by X-ray CT method, the position and size of defects could be detected exactly.
南江댐 流域에 있어서 高度에 따른 降水量分布에 關한 調査 硏究
梁崙模,朴浚一 慶尙大學校生産技術硏究所 1990 生産技術硏究所論文集 Vol.6 No.-
Based on rainfall over upper basin, dam operation would be used. There are some questions in convertion point rainfall measured in upper basin to areal rainfall. Since the rainfall varies with basin elevation, orientation, density of rain gauges and topological distribution of mountains. Among these elements, basin elevation would influence the distribution of rainfall over a basin. Therefore, this paper aims at rainfall distribution according to basin elevation in the Nam River dam basin where there have complex terrain. Authors can be formulated the relation between basin elevation and rainfall depth in the Nam River dam basin.
관계성을 이용한 효율적인 객체 지향 데이타 모델의 설계와 구현
김준모 기전여자대학 1992 論文集 Vol.12 No.-
본 논문에서는 기존의 객체 지향 데이타 모델에서의 관계성을 확장한 새로운 객체 지향의 데이타 모델을 제시한다. 이와 같은 모델 설정을 위해 관계성 클래스를 도입하였으며, 이 클래스들을 연산하기 위한 관계성 연산 클래스를 설계하였다. 또한, 확장된 객체 지향 데이타 모델하에서 정보의 검색과 변경을 위한 질의어 형식을 제시하였고 이를 처리하기 위한 모듈을 설계하고 구현하였다.