대기 속도 측정센서가 없는 무추력 비행체의 바람을 고려한 궤적보정 알고리즘 연구

홍진성,이은용,이광현,허기봉 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.4

본 논문에서는 대기 속도 측정 센서가 없는 무추력 비행체의 바람을 고려한 궤적 보정 알고리즘을 제시하였다. 궤적 보정시에는 특정 패턴을 이용하였고, 바람 방향 및 세기에 따라서 변하는 활공비를 사전에 몬테카를로 시뮬레이션을 통해 예측하였다. 이를 통하여 바람 조건하에서 비행하더라도, 종말유도 시작시 고도가 원하는 고도 범위 안에 있도록 고도 범위를 비선형식을 통해 예측하는 방법을 제안하였다. 제시된 알고리즘은 비행시험을 통해 그 성능을 확인하였다. In this paper, the gliding vehicle without the thrust and pitot tube which measures the air speed is concerned. As the pitot tube is not applied for this vehicle, alternative algorithm such as air speed estimation filter is required. In addition to that, wind condition during flight is important consideration because of no thrust. In this paper, specific trajectory is considered for the flight under the severe wind condition. we proposed the algorithm that satisfy the vehicle to enter the certain range of height for successful terminal guidance. It is verified by the flight test.

GM 격리포장 내 고추에서 분리한 Cucumber mosaic virus 분리주들의 외피단백질 유전자 비교

홍진성,박호섭,류기현,최장경 한국식물병리학회 2009 식물병연구 Vol.15 No.3

Twelve Cucumber mosaic virus (CMV) isolates were isolated from genetically modified (GM) and non-GM Capsicum annuum in two GM fields, Namyangju and Anseong, and their properties were investigated in this study. Coat protein (CP) gene of the CMV isolates were synthesized by RT-PCR using genus-specific primers which designed to amplify a DNA fragment of 950 bp. Purified cDNA fragments were cloned into the pGEMT easy vector for sequence determination. Nucleotide sequences (internal 657 bp) of CMV isolates were compared with Fny-CMV CP sequences and there were no significant collection site specific sequence similarities found. When predicted amino acid sequences (219 amino acids) were compared with Fny-CMV CP amino acids sequences, there were 96.8% to 97.3% similarities found from Namyangju collections and 95.9% to 96.8% similarities from Anseong collections. The phylogenetic analysis with nucleotide sequences showed definite differences in CMVs which have been isolated from the two regions.

다수 무인기 군집비행을 위한 통합 벡터필드 유도법칙 연구

홍진성 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.12

Flocking is defined as a flock of birds, without a target point, flying together without colliding through position exchange with each other. When this flocking is expanded to flight using multiple unmanned aerial vehicles (UAVs), UAVs need waypoints to be entered in advance or changed in real-time to achieve goals, such as reconnaissance or attack missions. An algorithm uses the existing vector field guidance law, augmented CS model, and potential field to flock toward a given waypoint. This method also uses a potential field, and the weight must be calculated using the sum of three different guidance laws. This paper proposes a combined vector field guidance law that directly integrates the vector field velocity command in the augmented Cucker-Smale model, so the weight calculation is unnecessary. Through a simulation, the proposed algorithm confirmed that multiple UAVs starting from a random location form a flock with each other and fly along given waypoints while avoiding collisions. Furthermore, it was confirmed that the proposed algorithm could be used for obstacle avoidance. 군집비행(flocking)은 목표점이 없이 새와 같은 무리가 서로의 위치 교환을 통해 충돌하지 않고 한데 모여서비행하는 것으로 정의한다. 군집비행을 다수의 무인기를 이용한 비행으로 확장하면, 무인기는 정찰 또는 공격임무 등의목표를 달성하기 위해 미리 입력되거나 실시간으로 변하면서 추종해야 할 항로점(waypoint)이 필요하다. 주어진 항로점을 향한 군집비행 방법으로 기존의 벡터필드 유도법칙과 증강 CS 모델 및 포텐셜 필드(potential field)를 합해 사용한알고리즘이 있다. 이 방법은 포텐셜 필드를 추가적으로 사용하고 있으며, 세 개의 다른 유도법칙의 합을 사용함에 따라가중치 계산을 해야만 한다. 본 논문에서는 가중치 계산이 불필요하도록 증강 CS 모델 안에 벡터필드의 속도 명령을직접 사용한 통합 벡터필드 유도법칙을 제안한다. 시뮬레이션을 통해 통합 벡터필드 유도법칙을 사용하는 다수의 무인기가 임의의 위치에서 출발했을 때 서로 군집을 형성하고 충돌을 회피하면서 주어진 항로점을 따라 비행하는 것을 확인하였다. 제안한 알고리즘은 장애물 회피에도 활용할 수 있음을 추가적으로 확인하였다.

이종 자율 무인기 협업제어 국내 연구 현황

홍진성,황선유,허기봉 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11

무인화 및 자율화 기술이 발전함에 따라 전장 상태 확인, 공습 등 여러 임무 수행을 위한 다양한 플랫폼 간의 협력에 의한 무인 체계 운영의 가능성이 대두되고 있다. 본 논문에서는 다수 무인체계를 운용하는데 필요한 각 단계를 정의하고, 특히, 임무계획, 태스크 할당, 다수 무인기 운용에 필요한 자율화 부분에 대해 국내 연구 활동 부분 및 동향을 정리하였다. It has been issued that unmanned system operation should be considered on the heterogeneous multi-agents for reconnaissance and attack, in accordance with the development of unmanned and autonomous technologies. In this paper, each stage for multi-agent operations is defined and domestic research areas such as mission planning, task assignment, autonomous technologies are summarized.

HMD를 위한 아이트래커 시스템 개발

홍진성,방효충 한국항공우주학회 2006 한국항공우주학회 학술발표회 논문집 Vol.- No.-

연구실 및 산업체 탐방 : 한국지질자원연구원 자원활용소재 연구부

홍진성 한국광물학회 2005 광물과산업 Vol.18 No.2

Application of a Reassortant Cucumber mosaic virus Vector for Gene Silencing in Tomato and Chili Pepper Plants

홍진성,리선주,김은지,김태성,류기현,Chikara Masuta,이긍표 한국식물병리학회 2012 Plant Pathology Journal Vol.28 No.1

We developed a reassortant RNA virus vector derived from Cucumber mosaic virus (CMV), which has advantages of very wide host range and can efficiently induce gene silencing in a few model plants. Certain CMV isolates, however, show limited host ranges presumably because they naturally co-evolved with their own hosts. We used a reassortant comprised of two strains of CMV,Y-CMV and Gn-CMV, to broaden the host range and to develop a virus vector for virus-induced gene silencing (VIGS). Gn-CMV could infect chili pepper and tomato more efficiently than Y-CMV. Gn-CMV RNA1, 3 and Y-CMV RNA2-A1 vector were newly reconstructed,and the transcript mixture of RNA1 and 3 genomes of Gn-CMV and RNA2 genome of Y-CMV RNA2 containing portions of the endogenous phytoene desaturase (PDS) gene (CMV2A1::PDSs) was inoculated onto chili pepper (cv. Chung-yang), tomato (cvs. Bloody butcher,Tigerella, Silvery fir tree, and Czech bush) and Nicotiana benthamiana. All the tested plants infected by the reassortant CMV vector showed typical photo-bleaching phenotypes and reduced expression levels of PDS mRNA. These results suggest that the reassortant CMV vector would be a useful tool for the rapid induction of the RNA silencing of endogenous genes in chili pepper and tomato plants.

Phylogenetics and Gene Structure Dynamics of Polygalacturonase Genes in Aspergillus and Neurospora crassa

홍진성,류기현,권순재,김진원,김광수,박경철 한국식물병리학회 2013 Plant Pathology Journal Vol.29 No.3

Polygalacturonase (PG) gene is a typical gene family present in eukaryotes. Forty-nine PGs were mined from the genomes of Neurospora crassa and five Aspergillus species. The PGs were classified into 3 clades such as clade 1 for rhamno-PGs, clade 2 for exo-PGs and clade 3 for exo- and endo-PGs, which were further grouped into 13 sub-clades based on the polypeptide sequence similarity. In gene structure analysis, a total of 124introns were present in 44 genes and five genes lacked introns to give an average of 2.5 introns per gene. Intron phase distribution was 64.5% for phase 0, 21.8% for phase 1, and 13.7% for phase 2, respectively. The introns varied in their sequences and their lengths ranged from 20 bp to 424 bp with an average of 65.9 bp, which is approximately half the size of introns in other fungal genes. There were 29 homologous intron blocks and 26of those were sub-clade specific. Intron losses were counted in 18 introns in which no obvious phase preference for intron loss was observed. Eighteen introns were placed at novel positions, which is considerably higher than those of plant PGs. In an evolutionary sense both intron loss and gain must have taken place for shaping the current PGs in these fungi. Together with the small intron size, low conservation of homologous intron blocks and higher number of novel introns, PGs of fungal species seem to have recently undergone highly dynamic evolution.

소형 무인 헬리콥터의 점항법 유도법칙 설계

홍진성,황태원,민병문,방효충 한국항공우주학회 2006 한국항공우주학회 학술발표회 논문집 Vol.- No.-

The Plant Cellular Systems for Plant Virus Movement

홍진성,주호종 한국식물병리학회 2017 Plant Pathology Journal Vol.33 No.3

Plasmodesmata (PDs) are specialized intercellular channels that facilitate the exchange of various molecules, including sugars, ribonucleoprotein complexes, transcription factors, and mRNA. Their diameters, estimated to be 2.5 nm in the neck region, are too small to transfer viruses or viral genomes. Tobacco mosaic virus and Potexviruses are the most extensively studied viruses. In viruses, the movement protein (MP) is responsible for the PD gating that allows the intercellular movement of viral genomes. Various host factors interact with MP to regulate complicated mechanisms related to PD gating. Virus replication and assembly occur in viral replication complex (VRC) with membrane association, especially in the endoplasmic reticulum. VRC have a highly organized structure and are highly regulated by interactions among the various host factors, proteins encoded by the viral genome, and the viral genome. Virus trafficking requires host machineries, such as the cytoskeleton and the secretory systems. MP facilitates the virus replication and movement process. Despite the current level of understanding of virus movement, there are still many unknown and complex interactions between virus replication and virus movement. While numerous studies have been conducted to understand plant viruses with regards to cell-to-cell movement and replication, there are still many knowledge gaps. To study these interactions, adequate research tools must be used such as molecular, and biochemical techniques. Without such tools, virologists will not be able to gain an accurate or detailed understanding of the virus infection process.