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적외선 회전 Lovell 레티클 탐색기의 성능 분석 및 효율적인 반대응 알고리즘에 대한 연구
김선국,한성현,홍현기,최종수,Kim, Sun-Kook,Han, Sung-Hyun,Hong, Hyun-Ki,Choi, Jong-Soo 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.11
기존의 적외선 레티클(reticle) 탐색기에 대한 모델링은 주로 정적인 상황 하에서 이루어졌다. 그러나 본 논문에서는 동적인 상황 하에서 다양한 형태로 실험할 수 있는 레티클 탐색기의 컴퓨터 시뮬레이션 툴을 개발하였다. 그리고 다중 표적, 특히 대응능력인 섬광탄이 존재하는 상황에서 효과적으로 대처할 수 있는 반대응 기법을 제안한다. 개발된 시뮬레이션 툴을 이용하여 회전 레티클 탐색기의 다양한 성능을 분석하였으며, 섬광탄 및 다중 표적이 있는 경우에서의 표적 신호 검출 및 추적 결과를 제시하였다. 섬광탄이 존재하는 상황에서 제안된 반대응 알고리즘이 간단하면서 효율적임을 컴퓨터 시뮬레이션 결과로부터 확인하였다. The previous simulation models of infra-red (IR) reticle seekers were performed in a static situation. However, in this paper, we develop a new simulation tool which is applicable in various cases, and propose an efficient counter-countermeasure (CCM) in the presence of countermeasures (CM) such as flares. The developed tool analyzes performance of rotating Lovell reticle seeker, and gives tracking performances in various scenarios. The simulation results show that our counter-countermeasure algorithm makes an efficient target tracking in the presence of flares.
김선국,이강준,이승환,남민,정영조,Kim, Sun-Kook,Lee, Kang-Joon,Lee, Seung-Hwan,Nam, Min,Chung, Young-Cho 대한생물정신의학회 2003 생물정신의학 Vol.10 No.2
Objective:The differences of various neurocognitive functions, including attention, memory, motor function, and higher cognitive function were compared between PTSD patients and normal control subjects. Also, correlation with PTSD symptom severity and neurocognitive functions were evaluated between PTSD patients and normal control subjects. Method:We assessed the neurocognitive functions by computerized neurocognitive test(CNT) batteries. The visual continuous performance test(CPT) and digit span test, finger tapping test and Wisconsin card sorting test(WCST) were executed. The Impact of Event Scale-Revised(IES-R) was used in the evaluation of the severity of PTSD. Result:The PTSD patients showed significantly impaired neurocognitive performance in all of the items, compared with normal control subjects. The relation between impairment in neurocognitive functions and symptom severity showed significant correlations. Conclusion:These results imply that PTSD patients have impaired neurocognitive functions concerning with specific brain areas, especially the frontal area. For the thorough evaluation of further neurocognitive functions, more detailed evaluation items of neurocognitive functions and brain imaging studies are necessary in the future study.
Sun-Kook Kim(김선국),Byeong-Sam Kim(김병삼),Beom-Ryong Kang(강범룡),Seung-Koo Yang(양승구),Byeong-Ho Kim(김병호),Hee-Kwon Kim(김희권),Hyun-Woo Kim(김현우),Kyeong-Ju Choi(최경주) 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.5
Organic grape was generally produced in rainshield or plastic greenhouse culture while most of fruits were produced in open field. But little attention has been given to soil properties with different culture facilities in organic grape cultivation. This study was conducted to investigate soil physico-chemical properties of organic grapes farms with different culture facilities and soil management practices. Organic fertilizer was main resource to manage soil at organic grapes farms. Organic grapes farms were applied with total amount of organic fertilizer at one time, either at basal or additional fertilization, whereas conventional grapes farms applied with split fertilization. Bulk density and penetration resistance of soil were lower at both rainshield and green manure-applied plastic greenhouse cultures than those at clean plastic greenhouse culture. Especially, in plastic greenhouse, sod culture with natural weed after green manure application was more effective than general sod culture in improving physical properties of the rhizosphere. The contents of organic matter, available phosphate and exchangeable potassium tended to increase in the soils applied with green manure, and the difference of soil chemical properties were significant between rainshield and plastic greenhouse cultures. The optimum soil management was required in plastic greenhouse because pH, available phosphate and exchangeable cations reached over optimum range. Consequently, the ground cover management is the key factor to affect the chemical properties as well as soil physical properties extensively in plastic greenhouse. It is found that sod culture with natural weed after green manure application resulted in enhancement of utilization efficiency of nitrogen, phosphoric acid and potassium in soil in comparison with general sod culture.
Chemical Properties of Paddy Soils and Factors Affecting Their Change in Jeonnam Province
Sun-Kook Kim(김선국),Hyeon-Ji Kim(김현지),Byeong-Ho Kim(김병호),Hee-Kwon Kim(김희권),Hyun-Woo Kim(김현우),Seong-Soo Kang(강성수) 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.5
The long-term changes in the soil properties are closely related to the policy direction and the national program for the soil management. In this study, chemical properties of paddy soils in Jeonnam province were investigated at four-year interval since 1999 and the factors affecting change of chemical properties were analyzed in relation to the soil management policies. Chemical fertilizers supplied to Jeonnam province reduced by 57% in 2013 as compared with 1999, and the ratio of Jeonnam province to the national fertilizer supply gradually decreased to 14.1% in 2013 from 17.6% in 1999 due to national policies to reduce use of chemical fertilizers in the 2000s. In the chemical analysis of paddy soils in Jeonnam province, pH value tended to increase gradually within the optimal range. Available phosphate and exchangeable potassium content were always higher than the optimal range and showed no significant difference since 1999. Organic matter, exchangeable calcium and available silicate content were found to be lower than average content in the whole country as well optimal range for rice cultivation in 1999, but were higher than average content in the whole country and optimal range in 2011 because of faster rate of increase in Jeonnam province than the other region since the mid-2000s. The cause of increase in organic matter, exchangeable calcium and available silicate contents is considered to be the increased use of green manure crops and by-products fertilizer as an alternatives for conventional application of chemical fertilizers and soil amendment such as silicate fertilizer for agronomic control of the disease and insect pest in rice cultivation of environmentally-friendly agriculture.
충북지역 노지포도원에서 열점박이별잎벌레 (Oides decempunctatus)의 발생생태 및 발육특성
김선국 ( Sun Kook Kim ),윤창만 ( Changmann Yoon ),이석호 ( Seok Ho Lee ),장후봉 ( Who Bong Chang ),김이기 ( Yee Gi Kim ),김길하 ( Gil Hah Kim ),김형환 ( Hyeong Hwan Kim ) 한국토양동물학회 2015 한국토양동물학회지 Vol.19 No.1
This study was conducted to investigate the seasonal occurrence of Oides decempunctatus (Coleoptera: Chrysomelidae) and it`s damage on grape according to the variety. In Chungbuk province, occurrence of O. decempunctatus was from 20 to 38% at open field vineyard during 2011 to 2012. O. decempunctatus showed the highest peak in mid-late June (larva) and mid-late August (adult). Overwintered eggs of O. decempunctatus were hatched from late May to early June. Larval period was from late May to mid July and pupal period was taken one month during July under the ground soil. Adults appeared in mid July and it began ovipositing on the ground near the crown until mid October. Among 39 varieties, Seyve villard 5247 was damaged more than 50% by this pest, and followed 6 varieties including Baco 22A were damaged within 20~50%. Whereas, Neo Muscat, MBA and Delaware were damaged less than 5%. Developmental period of O. decempunctatus from egg to emergence was taken times as 86.0 days at 20℃ and 40.7 days at 30℃. The hatching rate was the highest at 25℃ showing 79.9%, wheres it was decreased to 39.8% at 30℃. Each developmental zero point (15, 20, 25, 30±1℃, 60±5% RH) was recorded as 9.9, 11.5, 9.1, 9.3℃ and effective accumulated temperature was investigated 166.6, 290.9, 404.2, 913.2 Degree Day (DD).
구강악안면 감염 질환에서 배양된 세균의 양상과 항생제 감수성
김선국(Sun-Kook Kim),국민석(Min-Suk Kook),한창훈(Chang-Hun Han),유선열(Sun-Youl Ryu) 대한구강악안면외과학회 2005 대한구강악안면외과학회지 Vol.31 No.4
Oral and maxillofacial infections are most commonly odontogenic in origin. The present study was implemented for patients with oral and maxillofacial infections in order to determine what differences were present in cultured bacteria, depending upon the different types of infection. For the present study, the epidemiological characteristics, the state of infection, and the results of the pus culture and antibiotic susceptibility tests were analyzed for the 159 cases where pus culture tests were performed. The patients were treated at the Oral and Maxillofacial Surgical Department of Chonnam National University Hospital during an 18-months period from March 2003 to August 2004. Among the total 159 pus culture specimens, bacteria were cultured in 111 cases (69.8%). In the 111 pus culture specimens, Streptococcus species, Neisseria species, and Staphylococcus species were cultured from 69 cases (51.1%), 21 cases (15.6%), and 15 cases (11.1%), respectively and were determined to be bacterial strains the predominant bacteria responsible for oral and maxillofacial infectious diseases. Twenty four cases (15.1%) among the 159 specimens showed mixed infections. The mostly isolated bacteria from each of the space abscess, dentoalveolar abscess, inflammatory cyst, and pericoronitis cases were the Viridans streptococci. There was little relevance between the type of infection and the type of cultured bacteria. Antibiotic susceptibility tests showed a high level of susceptibility to teicoplanin(100%), vancomycin(100%), chloramphenicol(96.4%), ofloxacin(88.3%), imipenem(83.3%), erythromycin(82.5%) and a low susceptibility to cefazolin(40.0%), oxacillin(44.7%), ampicillin(49.4%), penicillin(51.1%). These results indicate that there was no significant difference among the cultured bacteria depending on the type of infections and their susceptibility to cephalosporin and penicillin G was low.
김선국(Kim Sun-Kook),이석호(Rhi Seok-Ho),원병철(Won Byung-Chul),김대현(Kim Dae-Hyun),이충구(Lee Chung-Gu) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.9
A new progressive advanced approach (Loop thermosyphon Thermoelectric Power generation System) is suggested to optimize heat recovery ability from vehicle exhaust gas. As an initial look at device feasibility, the present new TE system adopted the loop thermosyphon as a cooling heat exchanger. The TE system with loop thermosyphon was investigated in terms of working fluids, instability of system, amount of working fluid, and so on. Basically, the present experimental works have been focused on finding the optimum working condition of the system to improve thermoelectric power output and to obtain stable power generation to operate hybrid vehicles. The present experimental results with the loop thermosyphon TE module shows possibilities as an improved TE system for future thermoelectric hybrid vehicles.