확산 스펙트럼 통신방식의 위성링크 시스템에서 항재밍 성능비교 분석 ( Anti-Jamming Performance Analysis in the Satellite Link System of DS-SS )

고재덕,유흥균 한국통신학회 1997 한국통신학회 학술대회논문집 Vol.16 No.1

우리나라 벼 도열병균의 대표 균주 및 벼의 저항성 유전자형 선발

고재덕,한성숙,김병련,이세원,노재환,신동범,정지웅,조영찬 한국식물병리학회 2013 식물병연구 Vol.19 No.4

Rice blast is one of the most serious disease threatening stable production of rice. Breeding of resistantcultivars has been used as the most effective and useful method to controll rice blast caused by Magnaportheoryzae. To collect rice blast isolates in fields and test their pathogenicity on new cultivars are important forestablishment of new resistant cultivars breeding program of rice. Pathotypes of Korean rice blast isolateshave been categorized to Korean differential race system developed in 1985. However, it is little known aboutgenetic background of Korean differential cultivars, so that it is hard to understand for relationship betweeneach pathogen and each host plant at genetic level. In this study, we suggested necessity of a new differentialsystem by analyzing pathogenic responses between 24 monogenic rice lines and 200 Korean rice blast isolates. In addition, we determined the nine representative resistant genes based on the resistance responses of themonogenic lines to rice blast isolates, indexed resistant responses of the monogenic lines to ten representativerice blast isolates and selected 30 Korean representative rice blast isolates proper to Korean system. We thinkthe newly developed differential race system can be broadly used to select resistant cultivars to rice blast in Korea. 벼 도열병은 안정적인 쌀 생산을 위협하는 대표적인 병으로, 도열병 방제에는 저항성 품종의 육종이 가장 효과적으로 이용되었다. 병원균의 꾸준한 수집과 이들을 이용한 저항성 검정 테스트는 신품종 육성 프로그램에서 중요한 과정이다. 1985년 이래 우리나라의 도열병균은 8개의 판별품종을 이용한 레이스 판별시스템을 구축하여 분류하였다. 그러나 기존의 판별품종은 유전자형이 연구된바 없어 새로운 레이스 출현이나 병 저항성 붕괴 등에 대하여 과학적으로 분석하여 신속하게 대처하기가 어려웠다. 따라서 이 연구에서는 유전자형이 밝혀진 단인자 저항성 계통과 우리나라에서 수집된 200개 균주의 병원성반응을 분석하여, 새로운 판별 품종 시스템의 필요성을제시하였다. 또한, 24개의 단인자 저항성 계통의 병원성반응을 통해 9개의 대표 저항성 유전자를 선발하였으며,이에 따른 10개의 대표균주 그룹과 그 저항성 반응을 인덱스화 하고 30개의 한국형 대표균주를 선발하였다. 이연구는 향후 도열병 저항성 검정 및 벼 신품종 육종에 기초자료로서 활용될 수 있을 것이다.

Evaluation of Sequential Planting Method for Screening of Durable Resistance against Rice Blast in Rice Breeding Program

고재덕,김병련,신동범,강인정,이봉춘,강항원,한성숙 한국식물병리학회 2015 식물병연구 Vol.21 No.1

A sequential planting method was developed to screen rice plants with durable resistance against rice blastin a short time, and applied for several years in Korean rice breeding program. In this study, we showed theadvantages of a sequential planting method compared to other pathogenicity tests. The correlation analysisamong three pathogenicity tests and other factors demonstrated that durable resistance depended on theaverage of diseased leaf area and the number of compatible pathogens. Significant correlations were foundin the nursery test but not in the field test result. In addition, we traced changes in the pathogen populationduring sequential planting stages through re-isolation of the pathogen. The portion of compatible pathogenswas increased during sequential planting. Through this study, we provide an effective sequential plantingmethod and direction of durable resistance in a breeding program.

Antigone 規格化된 規制속의 개성

고재덕 경기대학교불어불문학회 1984 佛語佛文學會誌 Vol.2 No.-

IEEE 802.15.3 WPAN에서의 Erasure Coding 인지형 Delay ACK 전송 기법

고재덕(Jaeduck Ko),백상헌(Sangheon Pack) 한국정보과학회 2009 한국정보과학회 학술발표논문집 Vol.36 No.2A

증기 압축식 냉동 시스템 내 과냉 온도조건에서 R600a의 비평형 이상유동

고재덕(Jaedeok Ko),서준영(Joon-Yong Seo),이원종(Won-Jong Lee),정지환(Ji Hwan Jeong) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.11

A vapor compression refrigeration system is typically designed such that the refrigerant reaches a subcooled liquid state at the condenser outlet. In this study, a series of experiments are conducted to investigate the refrigerant state between at the condenser outlet and the capillary tube inlet. The experimental apparatus equipped with thermocouples, pressure measurements and visualization device was installed and operated with R600a as a refrigerant. The visual observations, as well as temperature and pressure measurements, demonstrate that R600a flows in a non-equilibrium two-phase state at highly subcooled temperature condition. Furthermore, a set of equations is proposed for calculating the specific enthalpy of the refrigerant in a non-equilibrium two-phase state, and this proposed method is verified using experimental measurements. It is found that the thermodynamic property table does not provide an appropriate value of specific enthalpy in non-equilibrium conditions, while the enthalpy calculation method proposed in this study is in excellent agreement with the experimentally measured values.

증기 압축식 냉동시스템 내 과냉온도 조건에서 R-600a의 비평형 2상유동이 시스템의 성능에 미치는 영향

고재덕(Jaedeok Ko),정지환(Ji Hwan Jeong) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.11

벼 키다리병 방제를 위한 차아염소산나트륨 이용

신동범,고재덕,이봉춘,강인정,강항원 한국식물병리학회 2014 식물병연구 Vol.20 No.4

For application of sodium hypochlorite as a seed disinfectant to the control of bakanae disease caused by Gibberella fujikuroi in rice, we investigated the effects of sodium hypochlorite for antifungal activity, eliminating fungus from seeds and reducing disease occurrence in vitro and greenhouse. The viability of the pathogen was significantly reduced at 80 ml/l concentration of sodium hypochlorite, and the pathogens did not grow at over 100 ml/l concentration of sodium hypochlorite. The effect of eliminating fungus was 90% at treatment of 0.3% sodium hypochlorite solution to infected rice seeds for eight hours. When the rice seeds were soaked into 0.5% and 0.3% sodium hypochlorite solutions for twelve hours, the disease incidences of rice seedling were remarkably reduced to 4.3% and 4.7%, respectively, compared to 97.3% of non-treatment control. The rates of seedling stand were 29.1% and 26.9% higher with the sodium hypochlorite treatment than that of non-treatment control. When prochloraz and sodium hypochlorite was treated to naturally severely infested rice seeds with bakanae disease, the disinfection effect was higher than that of prochloraz alone treatment. When the seeds were soaked in sodium hypochlorite before or after prochloraz, the rate of seed contamination was low as 4.0% or 6.3%, respectively, compared to prochloraz alone as 13.7%. The disease incidence was low as 3.7% or 8.3%, respectively, compared to prochloraz alone as 14.3%. The disinfection effect of treatment with prochloraz after sodium hypochlorite was higher than that of treatment with prochloraz before sodium hypochlorite.

2014년과 2015년 잎 도열병 발생 분포 및 레이스 분포 현황

김양선,고재덕,강인정,심형권,신동범,허성기,노재환 한국식물병리학회 2016 식물병연구 Vol.22 No.4

The nursery test against rice blast in Korea from 2014 to 2015 was analyzed. The average of disease severity of leaf blast in 12 sites showed 3.7±2.1 in 2014 and 4.4±2.1 in 2015. Disease severity of leaf blast in Icheon and Cheolwon was increased ranging from 2.8±2.2 in 2014 to 6.3±1.8 in 2015. Using a designation system, a total of 588 isolates collected those years were categorized into 34 races in 2014 and 51 races in 2015 based on the reaction pattern of Korean differential varieties. The blast isolates of 2015 were more diverse than those in 2014. The ratios of KI race to KJ race were 54:46 in 2014 and 70:30 in 2015; however, the predominant race population was KJ-301 as 16%, and KI-101 as 15% in 2014 and 2015, respectively. These results indicate that the distribution of the blast races is getting more diverse in Korea, therefore, this research would provide the possibility to predict race distribution and change to prevent the outbreak of rice blast and will also serve as a useful information for breeding of resistant rice cultivar against blast.

확산 스펙트럼 위성 통신 시스템의 재밍간섭시의 성능 개선

김기근,고재덕,유흥균 한국전자파학회 1998 한국전자파학회논문지 Vol.9 No.2

현재 위성통신 시스템에는 수동형 중계기가 많이 사용되고 있다. 이러한 수동형 중계기는 전체 위성통신 링크 시스템에서 재맹 간섭 선호에 대해 매우 취약한 부분이다. 수동행 중계기에 들어온 모든 신호는 주파수 변환, 재 전송 되면서 혼변조 성분을 발생하게 된다 본 연구에서는 중계기에 들어오는 재밍 신호에 대해서 사용자 신호의 대역을 확장하여 이러한 재멍 신호를 억압하는 방법을 제기하고자 한다. 정지궤도 위생중계 시뮬레이션 모델을 설정하고 DSSS 방볍에 의한 재머 억압 능력을 확인하여, 부분 대역 겹침의 경우에 처리이득이 16.9 [dB]이면, 2 2ASK 재머에 대해서는 BER이 $10^{-3}$ 에서 약 16.7 [dB], QPSK 재머에 대해서는 약 16.8 [dB]의 성능 개선을 얻었다. In recent SATCOM systems, transparent transponders are widely used. The transponder is, however, the most vulnerable part in SATCOM systems against jamming interference. All signals within the transponder bandwidth are frequency-converted and retransmitted with IM(intermodulation) products. In this paper, the method is proposed that makes the SJR(Signal-to-Jammer ratio) better. The bandwidth spreading of the user signal can reduce the jammers effects. The geostationary satellite system is modeled to simulate and to certificate the capability of suppression of jammers by DSSS. If signal is partially-overlapped by jammer and PG(processing gain) is 16.9 [dB] for 2ASK jammer and about 16.8 [dB] for QPSK jammer, when BER is $10^{-3}$.