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      • SCOPUSKCI등재

        국산재의 파괴인성에 관한 연구 (Ⅱ) : 활엽수의 모 - 드 Ⅰ 파괴 Mode I Fracture of Hardwoods

        이전제,심국보 한국목재공학회 1991 목재공학 Vol.19 No.1

        Tests of notched specimens of ten hardwood species in the LR and LT systems were conducted to investigate fracture toughness(K_(IC)) and effective moduli of elasticity(MOE). K_(IC) values were examined in relation to MOR, MOE, specific gravity of clear wood specimens. .It was found in both systems that there ware significant relationship between K_(IC) and MOR, K_(IC) and specific gravity. To predict the effective MOE of notched specimen from MOE of clear wood, it was analyzed by using equvalent cross-section method. In LR system, the observed values were similar to the predicted values. but in LT system, both were not agreed as the observed values were smaller. However, the results were shown that this method was avaliable to predict the effective MOE of notched specimens.

      • 목재의 열화 탐지를 위한 현장용 CT 개발

        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.

      • SCOPUSKCI등재

        목재의 섬유방향에 경사진 균열의 혼합모 - 드파괴에 관한 연구

        이전제 한국목재공학회 1989 목재공학 Vol.17 No.4

        목재의 섬유방향에 경사진 균열의 모-드 Ⅰ과 모-드 Ⅱ의 혼합모-드파괴시의 파괴거동을 조사하기 위하여 라왕(Shorea spp.)의 LA시스템에 있어서 서로 다른 경사각도를 가진 SEN시험편(Single edge notch specimen)에 대하여 휨 시험을 행하였다. 얻어진 결과는 혼합모-드파괴시, 모-드 Ⅰ 응력확대계수 K_I과 모-드 Ⅱ 응력확대계수 K_II 간에 일정한 상호작용이 존재한다는 것을 나타내었다. 또한, 모-드 Ⅰ과 모-드 Ⅱ의 임계응력확대계수(Critical stress intensity factor) K_10 와 K_110를 이용하여 혼합모-드파괴시의 K_I과 K_II 간의 상호관계를 규정할 수 있었으며, 이미 보고된 여러 실험식과 본 실험결과를 비교하여 가장 적합한 관계로서 아래와 같은 관계를 얻을 수 있었다.

      • SCOPUSKCI등재
      • SCOPUSKCI등재

        국산재의 파괴인성에 관한 연구 (Ⅰ) : 모 - 드 (Ⅰ) 파괴시의 파괴인성 Mode I Fracture Thoughness

        이전제 한국목재공학회 1989 목재공학 Vol.17 No.4

        The fracture toughness of two species, Pinus rigida MILL and Pinus koraiensis S. et Z. grown in Korea, was investigated by means of single edge notch beam specimen for the six principal systems of crack propagation in wood. The values of the fracture toughness for the LR and the LT systems (KTCLR and KICLT) were found to be similar to each other and about 8 times greater than those for the other systems (KICRL, KICTL and KICTR) in both species. The results indicate that the characteristics of fracture toughness in three principal directions of wood (L, R, T direction) are quite different from those of bending strength for the responsible direction. To predict KIC value based on the variation of specific gravity, the experimental values of KICLT and KICTL were compared to the predicted values by published relationship between KIC and specific gravity. However, there were 10 to 25% differences between the former and the latter.

      • KCI등재

        Tomosynthesis Feasibility Study for Visualization of Interiors of Wood Columns Surrounded with Walls

        이전제,김철기 한국목재공학회 2022 목재공학 Vol.50 No.4

        The need for non-destructive testing and evaluation of Korean traditional wooden buildings is increasing because of their widespread deterioration. Among all types of deterioration, termite damage in wooden columns is the most difficult to detect with the naked eye because it starts inside the wood, and the initial deterioration is small. X-ray computed tomography (CT) is the best technology to investigate the inner state of wood that has less damage, but applying it to wooden columns between walls is challenging. Therefore, the feasibility of tomosynthesis, which is a method to reconstruct a coronal section of a subject with a few X-ray projections from a limited angle of rotation, was studied as an alternative to CT. Pine (P. densiflora) with three artificial holes was prepared as a specimen to evaluate the quality of reconstructed tomosynthesis images according to the different number of projections. The quality of the tomosynthesis images in the in-focus plane was evaluated using the contrast-to-noise ratios, while a vertical resolution between the images was assessed by determining the artificial spread function. The quality of the tomosynthesis image in the in-focus plane increased as the number of projections increased and then remained constant as the number of projections reached 21 or over. In the case of vertical resolution, there was no significant difference when 21 projections or more were used to reconstruct the images. A distinct difference between coronal section images was found when the distance was more than 10 mm from one plane to another plane.

      • KCI등재

        집성재 단면구성에 따른 휨성능 평가

        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.

      • 경골 목조 전단벽의 축소모델 실험에 대한 연구

        이전제 서울대학교 농업생명과학대학 농업개발연구소 1998 농업생명과학연구 Vol.2 No.-

        In estimation of performance for a light-frame shear wall, the small-scale model test was researched and adopted. The materials of a small-scale model were determined by three experimental methods : Nail push-through test, Nail lateral resistance test and static bending test for studs. Then light-frame shear walls of the small-scale model and the full-scale model(prototype) were manufactured and tested. The results show that the small-scale model test method can be applied to timber structures and may be used as a good predictor of the estimation of the prototype.

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