그라우트 보강에 의한 압축형 앵커의 인발저항력 증가효과

임종철,이태형,홍석우 釜山大學校生産技術硏究所 1998 生産技術硏究所論文集 Vol.55 No.-

압축형 앵커는 현재 널리 사용되고 있는 인장형 앵커에 비해 진행성 파괴, 작업의 용이성, 경제성, 내구성 등의 면에서 보다 우수함을 인정받고 있으나 아직 국내에서는 그에 대한 연구가 부족한 실정이다. 본 논문은 국내 최초로 개발된 압축형(SSC/ Strong and simple Compression) 앵커에 관한 실내요소시험을 통하여 SSC 앵커에 대한 인발저항메카니즘을 분석하고, 압축형 앵커의 설계에 있어서 중요한 요인으로 작용되는 정착부 그라우트에 대한 강도를 평가할 수 있는 식과 함께 각자의 지반에 맞는 보강형식을 제안하였다. 본 논문의 결론은 다음과 같다. (1) 지반에 의한 구속압과 그에 의한 앵커체 내부 그라우트의 강도를 평가할 수 있는 식(5), (6), (7)을 제안했다. (2) 앵커 내하체에 보강 형식을 도입하였는데, 무보강시를 100%로 할 때 각각 132%, 147%, 217%의 그라우트 강도증가 효과가 있었다. (3) 내하체는 보강에 의한 강도증가효과와 지반의 구속압에 의해서 내하체 강도증가비가 최고 (R)=8.23까지 증가하는 것을 확인할 수 있었다. (4) 앵커 내하체의 그라우트 강도증가효과의 적용성을 보면, 풍화토에서는 보강형식 중 강관에 의한 보강이 유리하고, 경암과 같이 단단한 지반에서는 보강을 하지 않더라도 내하체의 강도는 충분히 크다. (1) The formula, which is able to calculate the grout strength in the fixed part of SSC anchor, is suggested. (2) The strength increment ratios(R) are 100%, 132%, 147%, 217% according to the reinforcing types of grout. The reinforing types are Non, Outside spiral, Inside-Outside spiral, Steel pipe, respectively. (3) The strength increment ratios(R) by reinforcement can be 8.23 times by the strength increment effect according to the reinforcement types and ground confining pressure. (4) The reinforcement Steel pipe is most effective in decomposed soil. Otherwise, in the case of hard rock ground, grout itself is very high by high confinning pressure, and so there is no need to use reinforcement.

기초주변지반의 마이크로 파일 보강에 의한 지지력 증가효과에 관한 연구

임종철,허진철,이태형,고호성 釜山大學校生産技術硏究所 2002 生産技術硏究所論文集 Vol.61 No.-

본 연구에서는 기초주변에 설치된 마이크로 파일의 길이와 보강범위에 따른 지반의 지지력 증가효과를 실내모형실험을 통하여 조사하였다. 실험 결과, 마이크로 파일의 최적 길이와 보강 범위가 제안되었다. 또한, 기초 직하에 설치된 마이크로 파일의 지지력과도 비교하였다. In this study, the increase in the bearing capacity of soil due to the variation of length and reinforcement scope of the micropiles installed near the foundation was investigated using model tests. From the test results, the length and the optimum reinforcement scope were proposed. In order to improve micropiles field application, it was compared with the increase in the bearing capacity for micropiles installed directly beneath the foundation.

평판재하시험과 실내시험에 의한 지반의 강도정수 비교에 관한 연구

임종철,이태형,안민홍,이헌일 釜山大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.57 No.-

기초의 지지력 산정방법 중에서 이론식에 의한 지지력의 산정법은 지반의 강도정수를 요소시험을 통하여 구한 후에 그 강도정수로서 지지력 계수와 극한 지지력이 구해질 수 있다. 그러나 요소시험(삼축압축시험, 평면변형률 압축시험)에 의한 지반의 강도정수는 균질한 지반의 극히 작은 시료를 통하여 구해지는 값이므로 지반 토괴로서의 특성을 나타내지 못한다. 더우기 현장에서의 지반의 강도정수 평가는 상당히 어렵다. 본 연구에서는, 현장 평판재하시험 결과를 이용하여 지반의 강도정수를 산정하고, 실내시험 결과와 비교하여 강도정수비를 정의 하였다. 이 강도정수비를 사용하면 평판재하시험에 의해 지반의 강도정수 (c, ø)를 구할 수 있다. The bearing capacity of the foundation can be calculated by using the soil rarameters(c, ø) obtained by the element test(triaxial compression test, plane strain compression test). But, as these parameters are obtained by using small specimens, so these values can't represent the characteristics of ground as a mass. In this paper, the strength paremeters can be estimated with the results of the field plate bearing tests. The parameter ratio is defined by comparing with the results of laboratory tests. We can obtain the strength parameters of ground mass by using the results of field plate bearing tests and this parameter ratio.

자연 교과 지도에 대한 초등 교사의 인식

김광명,신순임,강태완,이대형,장병기 춘천교육대학교 과학교육연구소 1995 과학교육연구 Vol.18 No.-

폐목질을 사용한 모르터의 물성에 관한 기초적 연구

황병준,김영주,강태경,정근호,임서형,정상진 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

Recently, as the alternatives to preserve environment such as effective usage of wastes or unusable resources are drawing attentions, researches and measures for the two tasks, which are reuse of waste wood and development of eco friendly materials, are being examined and established in various fields. However, they are still insufficient. Therefore, in this study, for the efficient application of waste woods and eco-friendly effects, mortar was produced using sawdust as the waste wood and mineral material cement for combination, in order to produce inorganic boards using waste woods, which were made when sawing. This study attempted to suggest a basic material about the physical properties of mortar, which used waste woods, after examining the features of wood mixture rate, water-cement rate, congelation according to the mixture rate of the setting accelerator, specific gravity, compression intensity, and bending intensity as experiment factors.

제6차 교육과정에 따라 편찬된 초등학교 자연 교과서의 분석(Ⅱ)

김광명,장병기,이대형,신순임,강태완 춘천교육대학교 과학교육연구소 1997 과학교육연구 Vol.20 No.-

폐목질을 사용한 시멘트보드의 물성에 관한 실험적 연구

황병준,정광식,강태경,김광기,임서형,정상진 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

Recently, as the alternatives to preserve environment such as effective usage of wastes or unusable resources are drawing attentions, researches and measures for the two tasks, which are reuse of waste wood and development of eco~friendly materials, are being examined and established in various fields. However, they are still insufficient. Therefore, in this study, for the efficient application of waste woods and eco~friendly effects, mortar was produced using sawdust as the waste wood and mineral material cement for combination, in order to produce inorganic boards using waste woods, which were made when sawing. The present study purposed to analyze the physical and dynamic characteristics of woody cement boards, which were made by modifying water~cement ratio for each wood inclusion rate based on a hardening~accelerator inclusion rate set in previous studies and, based on the findings, to provide basic data about the physical properties of inorganic boards made of waste wood, in order to produce woody cement boards using waste wood, which has problems in being used in the manufacturing of woody cement boards.

Double change detection과 배경 구축 기법을 이용한 웨이블릿 기반의 움직이는 객체 분할

임태형(Tae-Hyung Im),엄일규(Il-kyu Eom),김유신(Yon-Shin Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7

This paper presents wavelet-based moving object segmentation using double change detection and background registration. Three successive frame differences for detection change were used in the wavelet domain. The background was constructed with the wavelet coefficients in the lowest frequency subband which are the approximated version of an image. Combining double change detection and background registration, we can obtain an efficient moving object segmentation algorithm.

Test of Larvicidal Effect of Some Commercial Natural Products on Lepidoptran Plutella xylostella and Spodoptera Litura Larvae

( Hyung Uk Jeong ),( Hyun Hwak Im ),( Sung Kwon Chang ),( Chae Hoon Paik ),( Tae Ho Han ),( In Seon Kim ),( Ik Soo Kim ) 한국잠사학회 2007 International Journal of Industrial Entomology Vol.15 No.1

A diverse kind of environment-friendly agricultural materials (EFAM) for the control of insect pests is on the market. These EFAMs are a part of essential sources for the accomplishment of successful, sustainable, and environment-friendly agriculture. Thus, accurate information of these EFAMs is one that required for the success of environment-friendly agriculture, but, in reality, still appropriate information is absolutely in shortage. In this study, we, therefore, tested the efficacy of commercial EFAMs against two lepidopteran insect larvae, the diamondback moth Plutella xylostella (Lepidoptera: plutellidae) and the tobacco cutworm Spodoptera litura (Lepidoptera: Noctuidae). After the two insect pests were successfully stabilized in indoor environment the larvicidal activity was tested at 24±1°C, relative humidity (RH) of 60±5%, and a photoperiod of 16L : 8D, and mortality was determined 48 hrs after EFAMs are treated. The EFAMs that showed more than 90% of larvicidal activity were each six among 16 against both R xylostella and S. litura and only three of them showed consistent larvicidal activity against both species, signifying species specificity of EFAMs and importance of selection of proper EFAMs depending on target insect pest.

Enhancing the Wound Healing Effect of Conditioned Medium Collected from Mesenchymal Stem Cells with High Passage Number Using Bioreducible Nanoparticles

Im, Gwang-Bum,Kim, Yeong Hwan,Kim, Yu-Jin,Kim, Sung-Won,Jung, Euiyoung,Jeong, Gun-Jae,Wang, Ke,Kim, Jinheung,Kim, Dong-Ik,Kim, Tae-Hyung,Yi, Gi-Ra,Yu, Taekyung,Bhang, Suk Ho MDPI AG 2019 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.20 No.19

<P>Injecting human mesenchymal stem cells (hMSCs) at wound sites is known to have a therapeutic effect; however, hMSCs have several limitations, such as low viability and poor engraftment after injection, as well as a potential risk of oncogenesis. The use of a conditioned medium (CM) was suggested as an alternative method for treating various wounds instead of direct hMSC administration. In addition to not having the adverse effects associated with hMSCs, a CM can be easily mass produced and can be stored for long-term, thereby making it useful for clinical applications. In general, a CM is collected from hMSCs with low passage number; whereas, the hMSCs with high passage number are usually discarded because of their low therapeutic efficacy as a result of reduced angiogenic factor secretion. Herein, we used a CM collected from high passage number (passage 12, P12) hMSCs treated with gold-iron nanoparticles (AuFe NPs). Our AuFe NPs were designed to release the iron ion intracellularly via endocytosis. Endosomes with low pH can dissolve iron from AuFe NPs, and thus, the intracellularly released iron ions up-regulate the hypoxia-inducible factor 1α and vascular endothelial growth factor (VEGF) expression. Through this mechanism, AuFe NPs improve the amount of VEGF expression from P12 hMSCs so that it is comparable to the amount of VEGF expression from low passage number (passage 6, P6), without treatment. Furthermore, we injected the CM retrieved from P12 MSCs treated with AuFe NPs in the mouse skin wound model (AuFe P12 group). AuFe P12 group revealed significantly enhanced angiogenesis in the mouse skin wound model compared to the high passage hMSC CM-injected group. Moreover, the result from the AuFe P12 group was similar to that of the low passage hMSC CM-injected group. Both the AuFe P12 group and low passage hMSC CM-injected group presented significantly enhanced re-epithelization, angiogenesis, and tissue remodeling compared to the high passage hMSC CM-injected group. This study reveals a new strategy for tissue regeneration based on CM injection without considering the high cell passage count.</P>