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비파괴시험 및 관입시험을 이용한 기초지반의 다짐특성 평가를 위한 실내 모형토조 시험
김규선,우원택,이창호,이우진,Kim. Kyu-Sun,Woo. Wontaek,Lee. Changho,Lee. Woojin 한국방재학회 2013 한국방재학회논문집 Vol.13 No.5
본 연구는 흙강성 측정기(SSG), 동적 콘관입시험기(DCP), 시간영역 반사측정기(TDR)와 같은 비파괴시험 및 관입시험기를 기초지반의 다짐특성 평가에 활용하는 방법에 대해 기술하고 있다. 국내에서 채취된 통일분류법상 SP, SW-SM, SM 및 CL 흙을 다양한 함수비로 모형지반을 조성한 후, SSG, DCP, TDR, 평판재하시험(PLT), 캘리포니아지지력비(CBR)시험, 들밀도시험으로 측정시험을 수행하였다. 물리 역학적인 특성치를 비교 분석한 결과에 따르면, 비파괴시험 및 관입시험 결과는 기존의 시험방법과 유사한 성능을 신속하고 정량적으로 평가 가능한 것으로 나타났다. TDR 함수량계는 15%이하의 함수비에서 높은 정확도를 나타내었으며, SSG 탄성계수는 PLT 탄성계수의 약 2배의 결과를 나타내었다. 흙의 강성과 강도를 측정하는 SSG와 DCP의 측정치는 log-log 형태의 상관관계를 가지고 있음을 확인하였다. The paper describes the use of the nondestructive and penetration tests such as the Soil Stiffness Gauge (SSG), the Dynamic Cone Penetrometer (DCP), and the Time Domain Reflectometry (TDR) for evaluating the compaction characteristics of foundation soils. A comprehensive laboratory experimental program was conducted for the SP, SW-SM, SM, CL soil specimens. The SSG, DCP, TDR, plate load test (PLT), California Bearing Ratio (CBR) test, and the sand cone test were performed for compacted soil specimens with various water contents. The interpreted results show that the nondestructive and penetration tests can quickly and quantitatively evaluate the compaction characteristics of soils with similar performance. The TDR can measure the water content of soils with high accuracy when testing soils with a water content of less than 15%. The results show that the SSG modulus is approximately two times higher than the PLT modulus. The SSG and DCP measurements have a log-log correlation between the soil stiffness and the shear strength of soils.
김규선,윤대영,조소연,김영춘,김호철,이정근,최철순,배상훈,김정우 대한영상의학회 1996 대한영상의학회지 Vol.34 No.4
Purpose : To access the usefulness of magnetic resonance(MR) in the evaluation of orbital blowout fracture. Materials and Methods : Fourteen patients with orbital blowout fractures diagnosed by plain radiography(n=8) or computed tomography(CT)(n=6) were examined with MR. Twenty blowout fractures including six patients with two lesions were presented and the fracture site of the orbit was the medial wall in 11 cases and the orbital floor in nine cases. MR images in nine cases of six patients could be compared with CT scans. On MR images, we retrospectively evaluated the presence of fracture, herniation of orbital fat, abnormality of extraocular muscle, intraorbital hematoma and intrasinus hemorrhage. In nine cases we also compared these findings with CT scans. Results : Eighteen orbital blowout fractures with fat herniation could be diagnosed on MR images. In only nine of these 18 cases, the fracture itself could be seen on MR images as a disruption of the orbital wall, which produce a signal void. But two blowout fractures without orbital fat herniation, seen on CT, were not detected on MR images. Twenty abnormalities of extraocular muscle in 18 cases were depicted on MR images. There were no significant differences between MR and CT in the evaluation of orbital fat herniation and extraocular muscle abnormality ; however, in one case oblique sagittal MR images provided more useful information about the status of the inferior rectus muscle. Intraorbital hematoma was detected by MR in three patients. We were able to establish the presence of intraorbital hematoma by using the different signal intensities from fat or muscle on T1- and/or T2-weighted images. MR was found to be superior to CT in one case of intraorbital hematoma because of the iso-density of hematoma compared to muscle. MR also detected intrasinus hemorrhage which on T1-weighted images revealed high signal intensity in ten cases. MR was more valuable in demonstrating intrasinus hemorrhage in one case where a CT scan showed only hypodense fluid. Conclusion : MR is a useful diagnostic modality in the evaluation of orbital blowout fracture with orbital fat herniation. Compared with CT, it also provides more valuable information about associated extraocular muscle abnormality, subacute hemorrhage in the orbit and paranasal sinus.
김규선,이해민,박수현,김중헌 한국전자통신연구원 2023 ETRI Journal Vol.45 No.5
We propose an adaptive unmanned aerial vehicle (UAV)-assisted object recognition algorithm for urban surveillance scenarios. For UAV-assisted surveillance, UAVs are equipped with learning-based object recognition models and can collect surveillance image data. However, owing to the limitations of UAVs regarding power and computational resources, adaptive control must be performed accordingly. Therefore, we introduce a self-adaptive control strategy to maximize the time-averaged recognition performance subject to stability through a formulation based on Lyapunov optimization. Results from performance evaluations on real-world data demonstrate that the proposed algorithm achieves the desired performance improvements.
마이크로 컴퓨터를 이용한 원자력 분야 정보 관리 시스템 개발
김규선,김태승 한국정보관리학회 1989 정보관리학회지 Vol.6 No.1
마이크로 컴퓨터의 급속한 성장에 따라 그 이용 범위 또한 넓어지게 되었다. 본고에 서는 이러한 마이크로 컴퓨터를 이용해 원자력 정책 자료 검색 시스템을 설계하였다. The r a p i d i n c r e a s e o f microcomputer technology has r e s u l t e d i n t h e broad a p p l i c a t i o n t o various f i e l d s . The purpose of t h l s paper 1s to design a computerized r e t r i e v a l system f o r nuclear information m a t e r i a l s using a microcomputer.