AFLP 분석 및 체세포 불화합성에 의한 느타리 유사품종의 확인

서경인 ( Kyoung In Seo ),유영복 ( Young Bok Yoo ),장갑열 ( Kab Yeul Jang ),신평균 ( Pyung Gyun Shin ),오연이 ( Youn Lee Oh ),김광호 ( Kwang Ho Kim ),공원식 ( Won Sik Kong ) 한국균학회 2013 韓國菌學會誌 Vol.41 No.1

We already reported four groups which contains some similar strains based on URP-PCR in the previous paper. The objective of this study was to confirm those strains by the amplified fragment length polymorphism (AFLP) and vegetative compatibility group (VCG). AFLP analysis showed no difference among these strains except ASI 2595 and 2183 in Weonhyeong group and ASI 2829 in Suhan group. They showed specific DNA bands only in the result of P + AG/M + AAG and P + GT/ M + ATG primer combinations out of eight different combinations. The AFLP primers produced a total of 330 fragments between 80 and 1000 bp in length for 31 Pleurotus ostreatus strains. At a genetic similarity of 0.96, the UPGMA analysis separated the isolates into four distinct clusters. Each group was classified by similar strains. Confrontation test by vegetative compatibility groups (VCGs) also showed distinct line between strains from different groups, but no line between similar strains within the cluster. Our results indicate that most of similar strains was not distinctness. Thus, similar strains are considered to be very close on the genealogy of their parent or same strain with different name.

Review of Long-Term Creep Behaviors of Geosynthetic Reinforcements by Strain Compatibility

Jungjo Yuu(유중조),Yong Joon Lee(이용준),Sang Hun Park(박상훈),Han-Yong Jeon(전한용) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.4

To calculate the long-term allowable strength of geosynthetic reinforcement, replacement method was recommended. In isochronous curve at given time, we can read the allowable strength at allowable creep strain. The allowable strain gets from specification by directors or manufacturers according to the allowable displacement of reinforced structures. The allowable strength can be determined in relation to the allowable horizontal displacement each structures case by case. The effect of installation damage on isochronous behaviors of geosynthetic reinforcement was little. From the analytical consideration, the strain compatibility was recommended to determine long-term allowable strength of geosynthetic reinforcements considering tensile deformation between reinforcement and soil.

변형거동을 고려한 지오스트립 보강재의 장기성능 평가

전한용,정연인,Jeon, Han-Yong,Chung, Youn-In 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.4

Strain compatibility was applied to examine the limit of long-term allowable strength determination for geostrip as geosynthetic reinforcement. Creep test was performed for geostrip reinforcements according to SIM(step isothermal method) to obtain isochronous curve. Through the isochronous curve of geostrip reinforcements, the long-term allowable tensile properties of geostrip reinforcements was interpreted and analyzed.

순수전단이 작용하는 RC Panel의 응력-변형률 비선형해석

차영규,김학수 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 논문집 Vol.14 No.1

평형트러스모델, Mohr적합트러스모델, 그리고 연성트러스모델은 회전각에 기초하기 때문에 회전각모델이라 불리 운다. 이러한 회전각모델들은 콘크리트기여도를 예측할 수 없는 단점이 있다. 콘크리트 기여 성분을 계산할 수 있는 MCFT(Modified Compression Field Theory)나 RA-STM(Rotating Angle-Softening Truss Model) 같은 최근 트러스모델(Modern Truss Model, MTM)은 균열이 발생한 철근콘크리트요소를 연속체 재료로 취급한다. 또한 MTM은 평형조건과 적합조건 그리고 2축 상태에서 콘크리트의 연성 응력-변형률 관계를 이용하여 비선형해석을 수행하고 있다. 본 연구는 전단응력-변형률의 전체 이력 상태를 모두 계산하지 않고, 철근항복과 스트럿 압괴(crushing failure) 파괴기준을 이용하여 해를 찾는 방법으로 수렴속도를 개선한 것이다. 이 알고리즘을 이용하여 Hsu가 실험한 9개의 전단응력-변형률 자료를 분석하였다. The three truss models(equilibrium truss model, Mohr compatibility truss model, and the soften truss model) based on a rotating angle is called the rotating-angle model. The three rotating-angle models have a common weakness: they are incapable of predicting the so-called “contribution of concrete”. To take into account this “contribution of concrete”, the modern truss model(MCFT, STM) treats a cracked reinforced concrete element as a continuous material. By combining the equilibrium, compatibility, and the softened stress-strain relationship of concrete in biaxial state, MTM is capable of producing the nonlinear analysis of reinforced concrete structures composed of membrane element. In this paper, an efficient algorithm is proposed for the solution of proposed model incorporated with failure criteria. This algorithm is used to analyze the behavior of reinforced membrane element using the results of Hsu test.

An Improved Analysis Model for the Ultimate Behavior of Unbonded Prestressed Concrete

조태준,김명한 한국공간구조학회 2017 한국공간구조학회지 Vol.17 No.4

An innovative analysis method is proposed in this paper for the determination of ultimate resistance of prestressed concrete beams. The proposed method can be applied to simply supported or continuous beams in a unified manner whether structure and external loads are symmetric or not. Through the iterative nonlinear strain compatibility solutions, this method can also be applied to the non-prismatic section/un-symmetrical composite structures under moving load. The conventional studies have used the failure criteria when the strain of concrete reaches 0.003. However compared with bonded case, the value of strain in the reinforcement is much smaller than bonded case, thus, unbonded prestressed cases show compressive failure mode. It is shown that the proposed method gives acceptable results within 5% error compared with the prior experimental results. It can be shown that the proposed method can reach the solution much faster than typical three-dimensional finite element analysis for the same problem. This method is applicable to the existing unbonded prestressed members where deterioration has occurred leading to the reduced ultimate resistance or safety. In all, the proposed procedure can be applied to the design and analysis of newly constructed structures, as well as the risk assessment of rehabilitated structures.

An Improved Analysis Model for the Ultimate Behavior of Unbonded Prestressed Concrete

조태준,김명한,Cho, Taejun,Kim, Myeong-Han Korean Association for Spatial Structures 2017 한국공간구조논문집 Vol.17 No.4

An innovative analysis method is proposed in this paper for the determination of ultimate resistance of prestressed concrete beams. The proposed method can be applied to simply supported or continuous beams in a unified manner whether structure and external loads are symmetric or not. Through the iterative nonlinear strain compatibility solutions, this method can also be applied to the non-prismatic section/un-symmetrical composite structures under moving load. The conventional studies have used the failure criteria when the strain of concrete reaches 0.003. However compared with bonded case, the value of strain in the reinforcement is much smaller than bonded case, thus, unbonded prestressed cases show compressive failure mode. It is shown that the proposed method gives acceptable results within 5% error compared with the prior experimental results. It can be shown that the proposed method can reach the solution much faster than typical three-dimensional finite element analysis for the same problem. This method is applicable to the existing unbonded prestressed members where deterioration has occurred leading to the reduced ultimate resistance or safety. In all, the proposed procedure can be applied to the design and analysis of newly constructed structures, as well as the risk assessment of rehabilitated structures.

Study of sexual behaviour and characterization of female sex pheromone of fall armyworm Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) collected from different locations of Tamil Nadu, India

Muthukumar Muthamilselvan,Ashok Karuppannasamy,Samuel Kennedy John 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.4

The fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), is considered a highly destructive pest of maize. It has its origin in the tropical and subtropical regions of America and has recently invaded many agricultural regions of India. One of the struggles in managing the pest is pheromone divergence between strains and pheromone blend variation between geographically different populations. The calling pattern, copulation behaviour and mating compatibility of different populations of S. frugiperda were investi gated using behavioural methods. EAG and GC-EAD were used to analyze the chemical composition of the female gland extracts and GC–MS was used to identify the active compounds. In closed arena bioassays, the virgin males’ behavioural responses to the GC-EAD compounds were further assessed. Three active compounds, Z9-14:OAc, Z11-16:OAc and Z7-12:OAc, were identified as major constituents of sex pheromone extracted from rice strain FAW which were found to be feeding on maize. All three compounds triggered intense male antennation. This study provides a deeper insight into the sexual behaviour of fall armyworm which will help in the development of more efficient lure-based pest management strategies.

프리트레스트 콘크리트 부재에서 비 부착 긴장재의 극한응력 평가에 관한 연구(II)

임재형,문정호,음성우,이리형 한국콘크리트학회 1997 콘크리트학회지 Vol.9 No.5

본 연구는 비부착 긴장재를 갖는 부재에 대한 일련의 연구중 두 번째에 해당한다. 첫 번째 연구(1)에서는 기존연구의 제안식과 현행의 ACI 규준의 문제점을 고찰하고 기존의 총 167개 실험결과와 비교·분석하였다. 본 연구에서는 소성힌지 길이 개념과 변형도 적합조건에 의해서 비부착 긴장재의 응력을 평가할 수 있는 방법에 대한 검토를 통하여, 새로운 설계식을 제안하였다. 이는 이론적인 분석에 의한 변수설정과 기존 실험결과를 이용한 중회귀분석법을 사용하였다. 그리고 제안된 설계식을 기존의 식들과 비교하여 좋은 결과를 얻었으며, 제안된 설계식의 특성을 다음과 같이 설명하였다. (1)비부착 긴장재의 응력산정시 유효프리스트레스, 일반철근의 양, 작용하중의 형태 등은 중요한 변수로 작용할 수 있으므로 설계식에 고려하는 것이 바람직하다. (2)비부착 긴장재의 응력산정식은 현행 ACI 규준식과는 다르게 fc'/ p항의 제곱근과 비례하는 함수관계에 있다. (3)스팬-춤비가 비부착 긴장재의 응력에 미치는 영향은 소성힌지 길이의 개념에 의해서 역학적으로 타당하게 설명할 수 ldT다.

Study on High Temperature Processing of Biocompatible Ti-10Ta-10Nb Alloys

반재삼,이광민,황갑운,김현승,이경구,방몽숙,양홍서,임현필,오계정,박상원,윤귀덕 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.

Specimens of Ti-10Ta-10Nb have become hot forging after being heated to the state of α + β or â-phase. Various temperatures (650,700, 750, 800, 850oC) and strain rates (0.001, 0.01, 0.1, 1, 10 s-1) are used. Based on the flow stress data from temperatures and compressive strain rates, a processing map was developed. Processing efficiency is high below about 0.1 s-1 of strain rates and at almost all the temperatures, but reduced at 0.001 s-1 and 800oC because of the occurring of Shear band. Processing methods for optimal process are summarized on the basis of experimental findings. Bio-compatibility experiments indicated that Ti-10Ta-10Nb alloy is better than the control, Ti-6Al-4V alloy.

볼트 체결형 강판-콘크리트 합성보의 형상 제안

조태구(Tae-Gu Cho),최병정(Byong-Jeong Choi) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.7

강판 콘크리트 합성보는 강판, 콘크리트 및 2가지의 이질 재료를 결합시키는 전단 연결재로 구성되어 있다. 일반적으로 강판은 기존의 합성보에 용접하여 조립된다. 본 연구에서는 전단 연결재를 감소시키고, 작업성을 향상시키기 위해 SPC (Steel Plate Concrete Composite Beam) 보라 불리는 새로운 강판 콘크리트 합성보를 개발했다. SPC 보는 전단 연결재 없이 절곡된 강판과 콘크리트로 구성된다. 절곡된 강판은 용접 대신 고강도 볼트로 조립된다. 또한, 건설 현장에서 작업성을 향상시키기 위해 슬래브와 접합부에 모자 모양의 Cap이 부착된다. 변위 제어 모드에서 2점 가력 실험을 수행하였고, 시편의 휨 강도를 계산하기 위해 소성 응력 분포법과 변형률 적합법을 사용하였다. 시험 결과에 따르면 새로운 SPC 보의 휨 강도는 완전 합성보 강도의 76 %의 값이 나왔다. Cap은 스터드와 부속 철물의 역할을 수행한다. 또한, Cap의 간격 제어를 통해 합성율의 증가가 가능하고, SPC 합성보의 합성율을 고려할 경우 변형률 적합법을 통해 SPC 합성보의 휨 성능 평가가 가능하다. The steel-plate concrete composite beam is composed of a steel plate, concrete and a shear connector to combine the two inhomogeneous materials. In general, the steel plate is assembled by welding an existing composite beam. In this study, a new steel-plate concrete composite (SPCC) beam was developed to reduce the size of the shear connector and improve its workability. The SPCC beam was composed of folded steel plates and concrete, without any shear connector. The folded steel plate was assembled with high strength bolts instead of welding. To improve the workability in field construction, a hat-shaped cap was attached in the junction with the slab. Monotonic two-point load testing was conducted under displacement control mode. The flexural strength of the SPCC beam specimen was calculated to be 76% of that of the complete composite beam by using the plastic stress distribution method and strain compatibility method. The cap acted as the stud and accessory. The synthesis rate could be increased by controlling the gap of the cap, and the bending performance could be evaluated by using the strain fitting method considering the synthesis rate of the SPCC beam.