• Plant Resources
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• 제2권1호
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• pp.22-25
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• 1999

Molecular markers are useful to confirm the hybridity of F1 plant derived from cross of two homozygous parents with similar morphological traits. RAPD markers were used to test F1 hybrid plant obtained from cross of two homozygous soybean (Glycine max) parents. Fl plant for cross I was made from the mating of Hobbit87 (female) and L63-1889 (male) and Fl plant for cross II was obtained from the mating of H1053 (female) and L63-1889 (male). Selfing plant per each cross was also obtained. Among 20 Operon primers used, OPA04 and OPA09 show polymorphism between cross I and II parent. Band in size 1Kb of OPA04 and 2.1Kb of OPA09 primer was polymorphic band. This fragment identified Fl hybrid plant and selfing plant in cross I and II. Female parent Hobbit87 in cross I and H1053 in cross II has no this fragment (recessive allele). However, male parent L63-1889 and Fl hybrid plant in cross I and II has this size of polymorphic band (dominant allele). This indicated that Fl hybrid and selfing plants were detected by RAPD marker before phenotypic marker would be used to identify Fl hybridity. Amplification products of selfing plant for cross I and II were completely same to the those of female parent. When mature, flower color of Fl hybrid plant in cross I and II was purple and flower color of selfing plant in cross I and II was white. Purple flower is dominant trait. Fl hybridity was successfully detected at very early growth stage using RAPD marker. Therefore, RAPD marker can be used broadly to confirm Fl hybridity in many crops.

• 한국육종학회지
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• 제42권1호
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• pp.100-108
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• 2010

본 연구는 체세포 배수화를 통해 생산한 4배체 OA hybrid 와 다양한 교배조합간 후대를 대상으로 염색체 구성 및 조환여부를 알아보기 위하여 수행되었다. 4배체 OA hybrid의 여교잡 후대를 분석한 결과, 2배체 아시아틱 품종을 부 또는 모본으로 정역교배한 조합에서는 3배체가, 4배체 아시아틱과 4배체 OA 품종을 부 또는 모본으로 한 교배조합에서는 4배체가 생산되었다. 그러나, 2배체 Oriental 품종을 모본으로 교배한 경우, 3배체 또는 2배체를 얻을 수 있었다. OA hybrid를 대상으로 GISH방법으로 이종염색체의 조환여부를 확인한 결과, OA hybrid의 염색체수는 24개, 그 중 12개는 모본인 Oriental hybrid, 12개는 부본인 Asiatic hybrid에서 유래한 것을 알 수 있었다. 체세포 염색체간 배수화된 OA hybrid의 여교잡 후대의 경우, $A{\times}OA$, $OA{\times}A$ 교배에서는 Oriental hybrid 염색체가 12개, Asiatic hybrid 24개, $OA{\times}OA$간 교배에서는 Oriental hybrid 염색체 24개와 Asiatic hybrid 24개로 진정한 4배체 잡종임을 확인 할 수 있었으며, 이들 후대는 어떠한 조합에서도 부분적인 이종염색체간 조환이 일어나지 않았다. 한편 $O{\times}OA$ 교배의 후대식물의 염색체 구성은 Oriental hybrid 유래 염색체만 2x=24개인 경우와 3배체(Oriental = 24, Asiatic = 12)로 판명되었다. 4배체 아시아틱계 품종을 모본으로 한 $AA{\times}OA$ 교배조합의 경우, Asiatic hybrid염색체만 48개로 나타났다.

• 한국전기화학회:학술대회논문집
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• 한국전기화학회 2002년도 연료전지심포지움 2002논문집
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• pp.39-42
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• 2002

• Journal of the Korean Wood Science and Technology
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• 제48권2호
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• pp.245-252
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• 2020

This study was performed to analyze the mechanical properties of tropical hybrid cross-laminated timber (CLT) with bamboo laminated board as the core layer in order to evaluate the possibility of its use as a CLT material. Bamboo board was used as the core layer and the tropical species Acacia mangium willd., from Indonesia, was used as the lamination in the outer layer. The modulus of elasticity (MOE), modulus of rupture (MOR), and shear strength of the hybrid CLT were measured according to APA PRG 320-2018 Standard for Performance-Rated Cross-Laminated Timber. The results show that the bending MOE of the hybrid CLT was found to be 2.76 times higher than SPF (Spruce Pine Fir) CLT. The reason why the high MOE value was shown in bamboo board and hybrid CLT applied bamboo board is because of high elasticity of bamboo fiber. However, the shear strength of the hybrid CLT was 0.8 times lower than shear strength of SPF CLT.

• 설비공학논문집
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• 제15권6호
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• pp.543-550
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• 2003

In order to saving the energy for HVAC system of buildings, utilization of wind-induced cross ventilation is thought to be promising. However, utilization of natural ventilation alone is not sufficient for maintaining the human thermal-comfort such as in hot and humid regions. A hybrid air conditioning system with a controlled natural ventilation system, or combination of natural ventilation with mechanical air conditioning is thought to overcome the deficiency of wind-driven cross ventilation and to have significant effects on energy reduction. This paper describes a concept of hybrid system and propose a new type of hybrid system using radiational cooling with wind-induced cross ventilation. Moreover, a radiational cooling system is compared with an all-air cooling system. The characteristics of the indoor environment will be examined through CFD (Computational Fluid Dynamics) simulation, which is coupled with a radiation heat transfer simulation and with HVAC control in which the PMV value for the human model in the center of the room is controlled to attain the target value.

• 한국전자파학회논문지
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• 제21권11호
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• pp.1229-1234
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• 2010

차세대 이동 통신에서는 고품질, 고속 통신의 멀티미디어 서비스를 요구한다. 이러한 서비스를 만족시키기 위해서는 강력한 오류 정정 기법이 사용된다. ARQ(Auto Repeat Request) 기법은 전송 효율적인 측면, 그리고 FEC(Forward Error Correction) 기법은 높은 신뢰도면에서 취약한 단점을 가지고 있다. 이러한 단점을 서로 보완한 H-ARQ(Hybrid Auto Repeat Request) 시스템이 현재 연구 중에 있다. 따라서 본 논문에서는 cross layer를 이용한 H-ARQ 시스템을 분석하였다. Cross layer coding 기법과 H-ARQ type, 채널 환경에 따라 적합한 H-ARQ 방식을 BER 성능과 전송 효율 분석을 통해 제안한다.

• Structural Engineering and Mechanics
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• 제70권5호
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• pp.535-549
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• 2019

This study aimed to develop a high-order shear deformation theory to predict the free vibration of hybrid cross-ply laminated plates under different boundary conditions. The equations of motion for laminated hybrid rectangular plates are derived and obtained by using Hamilton's principle. The closed-form solutions of anti-symmetric cross-ply and angle-ply laminates are obtained by using Navier's solution. To assess the validity of our method, we used the finite element method. Firstly, the analytical and the numerical implementations were validated for an antisymmetric cross-ply square laminated with available results in the literature. Then, the effects of side-to-thickness ratio, aspect ratio, lamination schemes, and material properties on the fundamental frequencies for different combinations of boundary conditions of hybrid composite plates are investigated. The comparison of the analytical solutions with the corresponding finite element simulations shows the good accuracy of the proposed analytical closed form solution in predicting the fundamental frequencies of hybrid cross-ply laminated plates under different boundary conditions.

• Advances in materials Research
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• 제7권2호
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• pp.119-136
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• 2018

In this paper, static and vibration analysis for anti-symmetric cross-ply and angle- ply carbon/glass hybrid laminates rectangular composite plate are presented. In this analysis, the equations of motion for simply supported thick laminated hybrid rectangular plates are derived and obtained through the use of Hamilton's principle. The closed-form solutions of anti-symmetric cross-ply and angle- ply laminates are obtained using Navier solution. The effects of side-to-thickness ratio, aspect ratio, and lamination schemes on the fundamental frequencies loads are investigated. The study concludes that shear deformation laminate theories accurately predict the behavior of composite laminates, whereas the classical laminate theory over predicts natural frequencies. The excellent accuracy of the present analytical solution is confirmed by making some comparisons of the present results with those available in the literature. It can be concluded that the proposed theory is accurate and simple in solving the free vibration behaviors of anti-symmetric cross-ply and angle- ply hybrid laminated composite plates.

• 태양에너지
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• 제19권3호
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• pp.93-100
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• 1999

The objective of this experimental study was to investigate the characteristics of heat transfer and air flow in two-dimensional impinging jet system, in which hybrid rods have been set up in front of heating surface in order to increase heat transfer. The shape of hybrid rods had a cross section made with a half of circular cross section and that of rectangular. This time, the clearance from hybrid rod to heating surface(C=1, 2, 4mm) and the pitch between each hybrid rods(P=30, 40, 50mm) changed for the transition region(H/B=10). And this result compared with the experimentation without hybrid rod. As a result, heat transfer performance was best under the condition of C=1mm, in case clearance changed, and as the pitch is 30mm, it is largely influenced by eddies and acceleration in case pitch of hybrid rod changed.

• ETRI Journal
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• 제30권5호
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• pp.663-673
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• 2008

The multi-scenario topology of multi-channel hybrid ubiquitous sensor networks (USNs) is studied and a novel link auto-diversity cross-layer cooperative scheduling scheme is proposed in this paper. The proposed scheme integrates the attributes of the new performance evaluation link auto-diversity air-time metric and the topology space in the given multi-scenario. The proposed scheme is compared with other schemes, and its superiority is demonstrated through simulations. The simulation results show that relative energy consumption, link reception probability, and end-to-end blocking probability are improved. The addressing ratio of success with unchanged parameters and external information can be increased. The network can tolerate more hops to support reliable transportation when the proposed scheme is implemented. Moreover, the scheme can make the network stable. Therefore, the proposed scheme can enhance the average rate performance of the hybrid USN and stabilize the outage probability.