Design of a 200-MHz RFQ for 3-MeV He++ Beam Irradiation

조용섭 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7

To produce more efficient power semiconductors by reducing the switch loss, we studied heliumionimplantation instead of gold diffusion and electron irradiation. The 3-MeV energy and 0.1-mAcurrent for about a 10 × 1014 ions/cm2 dose is required for silicon wafers of ten inches in diameter. A radio-frequency quadrupole (RFQ) can be a good accelerator to meet the above requirements. Wedesigned a four-vane type 200-MHz RFQ for this purpose. A 25-keV/u He++ beam with a 10-mApeak current was extracted from an ion source and was matched to the RFQ by using electrostaticlenses. The RFQ is designed to accelerate He++ ions (A/q = 2) up to 750 keV/u. A 200-kWtetrode RF amplifier drives the RFQ with a duty factor of 1%. After the RFQ, a beam wobblingsystem and a beam transport system are required to irradiate the beam onto large silicon wafers. This work summarizes the detailed design of the irradiation system.

대두의 세균성병에 관한 연구

조용섭,유연현 한국응용곤충학회 1977 한국응용곤충학회지 Vol.16 No.1

1. 소규모접종시험을 위해서는 wire brush 접종 또는 다침접종법이 가장 효과적이었으며 포장에서의 대규모시험을 위해서는 전착제를 첨가한 세균현탁액의 살포가 좋았다. 2. 조사지역내에서의 발견된 병은 세균성 점무늬병과 세균성 불마름병 뿐이었고 담배 불마름병균에 의한 피해는 발견할 수 없었다. 3. 병원균은 이병조직속에서 겨울철인 경우 실내에서 6개월까지 생존할 수 있었고 냉장고 속에서는 10개월이상 존재했으며 토양속에서는 불마름병균이 4일, 점무늬병균이 30일간 생존하였다. 4. 종자표면에 부착된 세균은 전염원으로서 중요하지 않았으나 실험실내의 배양기 상에서는 종자의 발아를 억제했다. Bacterial diseases of soybean has been recognized as a limiting factor of soybean production in Korea as it was estimated to cause around 10 percent of yield losses annually. The purpose of the study is to obtain information on the diseases through proving the kinds of pathogens and epidemiology, The wire brush method and multineedle appeared to be the best way of inoculation under all circumstances. Wire brush method, especially, was effective in shortening the incubation period and manifesting the lesion development by introducing more inoculum per unit of area. In case of spray inoculation it was necessary to apply a small amount(1 : 1,000) of wetting agent, twin-20, otherwise it was unabled to produce the diseases under field conditions. Two kinds of bacterial diseases caused by Pseudomonas glycinea and Xanthomonas phaseoli var. sljense were found from surveyed areas in Kore. Wild fire disease on soybean caused by Pseudomonas tabaci had not detectable during the experiment although there were several reports on the disease from other countries. when the pathogens were introduced into sterile soil, bacterial leaf blight pathogen could exsisted until 30 days while bacterial pustule pathogen survived only 4 days under the natural conditions

벼 흰빛잎마름병균(病菌)의 병원성(病原性) 발현(發現)과 벼의 품종(品種) 및 생육시기(生育時期)와의 관계(關係)

조용섭,리순구 한국식물병리학회 1979 한국식물보호학회지 Vol.18 No.2

벼 흰빛잎마름病菌의 病原性 發現과 벼의 品種 및 生育時期와의 關係

趙鏞涉,李舜九 한국응용곤충학회 1979 한국응용곤충학회지 Vol.18 No.2

벼 흰빛잎마름병균의 10균주(I군 3균주, II군 4균주, III군 3균주)를 저항성이 서로 다른 벼품종 '밀양 23호'(김남풍군), '유신'(황옥군), '통일'(Rantaiemas군)의 유묘기와 분얼초기, 최고분얼기, 지엽기에 각각 접종하였다. 그 결과 1) 병원성 발현의 양상이 균주 간 매우 다양하였다. 2) 특히 II군의 균주들은 같은 군균내에서도 변이가 매우 큰 것으로 나타났다. II군은 더 많은 균형으로 세분될 수 있었다. 3) 생육시기 별로 병원성 발현 양상이 달랐으며, 대체로 지엽기 이후 높은 발병을 나타내었다. II군중 G 7716균주는 출수이후에야 비로소 '유신'품종에 발병을 일으킬 수 있었다. 4) 통계분산분석(ANOVA) 결과, 각각 다른 균형의 균주, 품종, 생육시기가 발병정도의 분산에 주요인으로 작용하였고, 균주와 품종간의 상호작용(interaction)에 유의성이 있었으나 다른 요인간에는 없었다. Ten isolates of Xanthomonas oryzae were inoculated to three rice varieties, 'Milyang 23' in Kinmaze group, 'Yushin' in Kogyoku group and 'Tongil' in Rantai-emas group, at the seedling stage, early-tillering stage, Maximum-tillering stage and flag-leaf stage. Much fluctuation was existed in virulence pattern of isolates at each growth stage. Especially, the isolates of pathotype II showed much more variation in virulence. This suggests that there would be more sub-divided pathotypes involved in pathotype II. Isolate G 7716 of pathotype II showed its virulence to 'Yushin' variety only after booting stage. On the result of the analysis of variance for the reaction of three rice varieties to three isolates at each growth stage, the isolates, varieties, growth stages were the main factors of variations of virulence, and the interaction of isolates with varieties was significant but other interactions were not.

벼 검은빛 모썩음병에 관한 연구

조용섭,Cho Y. S. 한국응용곤충학회 1965 한국식물보호학회지 Vol.4 No.-

본 병은 그 병징이 종래에 알려진 일반 묘썩음병과는 달리 검은빛 균사가 수중의 종자표면을 뒤덮어 자라면서 종자표면을 흑변시킬 뿐만 아니라, 종자의 주위토양까지도 흑변시켰으며, 발아한 종자는 최고 3cm 이상은 자라지도 못하고 흑변하여 부패하였다. 병원균은 자연상태에서나 인공배양기상에서나 포자를 형성하지 않았으며, 균사는 현미경하에서 암색을 띄었고 뚜렷한 격막을 갖고 있었다. 따라서 종래의 벼모썩음병 병원균의 대부분이 Phycomysetes에 속했으나 본병원균은 불완전균을 닮아 있었으며, 앞으로 그 구명을 위한 계속적인 연구가 필요했다. 본병의 발병환경은 모든 면에서 종래의 벼 모썩음병과 거의 동일했으며, 특히 종자가 발아할 때의 환경조건이 절대적인 영향을 미쳤다. 본병균은 종자를 통해서 전염되는 경우는 없었으며, 오직 감염된 토양에 의해서만 전염된다는 것을 알 수 있었다. The study was carried on a new disease of rice seedling which named 'Black rot of rice seedling'. None of papers on this disease was reported recently. The symptom of this disease was quite different from other seedling rot of rice plant. Submerged mycelial growth in water was black colored and it was surrounded whole surface of seed. Soil on which diseased seedlings were placed was black colored by this disease and the seedlings, finally stopped to grow within 3 em in height, and appeared with black rot symptom. Sporulation of the pathogen does not occurred under both of natural and artificial conditions. The mycelium appeared in dark color and with distinguished septation under the microscope. With those results it is easily recognized that the pathogen does not belong to those which causal organism:; of other seedling rot of rice plant like as Phycomycetes or Fusarium species. The study should be continued on identification of the causal organism. Favorable environments for the disease did not differ from other seedling rot of rice plant, and varietal resistance also did not significantly differ among the varieties used in this experiment. Dissemination of the disease was carried out not by planted seeds but by infected soil.

안전한 자전거 이용 활성화 방안 연구

조용섭 한국경찰연구학회 2017 한국경찰연구 Vol.16 No.4

The problem we have with society is that we can point out the problem of air pollution caused by a rapidly increasing number of cars. As a result, the use of bicycles has attracted a great deal of attention as an alternative means of transportation due to the seriousness of exhaust gas caused by automobiles. In order to solve these problems, advanced bicycle countries such as Germany and Denmark are planning to change the transportation policy from car centered traffic culture to bicycle center. In Korea, bicycle-related policies, one of the green growth transportation policies, are being implemented to solve environmental problems caused by traffic problems. At this point, it is meaningful to suggest ways to revitalize bicycle use, an eco-friendly green transportation system. In this study, we tried to find possible countermeasures for Jeonju city in Korea through cases of other countries. As a result, in case of Jeonju city, the public transportation and bicycle use is being activated, and the policy direction of the future transportation of Jeonju city is shifted from the center of automobile to the center of bicycle and pedestrian, In conclusion, it is necessary to actively support the efforts of Jeonju city, and it is necessary to support the central government, participate in civic organizations and citizens. 오늘날 우리 사회가 안고 있는 문제 중 하나는 산업화와 함께 급격히 발달해 온 자동차 증가로 인하여 배출되는 대기환경 오염문제를 지적하지 않을 수 없다. 따라서 자동차로 인한 배기가스 심각성으로 인해 이를 대체할 교통수단의 대안으로 최근 자전거의 이용이 각광받고 있다. 이미 독일이나 덴마크 등 자전거 선진국에서는 이러한 문제점을 해결하기 위해 승용차 중심의 교통문화에서 자전거 중심으로 교통정책의 변화를 도모하고 있다. 우리나라에서도 교통문제로 인한 환경문제를 해결하기 위하여 녹색성장(Green Growth) 교통정책 중 자전거와 관련된 여러 정책들을 현재 시행 중에 있다. 이 시점에서 친환경적 녹색교통수단인 자전거 이용활성화 방안을 제시한다는 것은 나름의 의미성을 가지고 있다고 할 수 있다. 본 연구에서는 해외 선진 사례를 통해 우리나라 전주시에 적용 가능한 대응방안을 모색하고자 하였다. 그 결과 전주시의 경우, 대중교통과 자전거 이용이 활성화 되고 있고, 전주시 미래 교통의 정책 방향을 자동차 중심에서 자전거와 보행자 중심으로 전환하고, 대중교통수단을 활성화 하는 인간 중심의 교통정책으로 목표를 설정하여 실천하여야 할 것이다. 이를 위해서 전주시의 적극적인 의지 및 노력이 이루어져야 하고, 중앙 정부의 지속적인 지원과 민간단체 그리고 시민들의 적극적이 참여가 필요하다고 할 수 있다.

대두(大豆)의 세균성병 (細菌性病)에 관(關)한 연구(硏究)

조용섭,유연현 한국식물병리학회 1977 한국식물보호학회지 Vol.16 No.1

Bacteriophage 에 의한 벼흰빛잎마름병균의 계통분류 및 그 분포에 관한 연구

조용섭,박창석,최용철,이경휘 한국응용곤충학회 1972 한국응용곤충학회지 Vol.11 No.2

1. 전국에서 채집 분리한 51개의 균주를 phage의 용 균형에 따라 분류하여 8가지 계통으로 나누었다. 2. 8가지 계통 중 F-계통이 우리나라에 가장 많았으며 H.C.A계통이 그 다음 순이었고 일본이나 남방계에 많은 D-계통은 발견되지 않았다. 3. 우리나라에 분포하고 있는 흰빛잎마름병균은 지역에 따라서 계통이 한정되거나 특이성을 보이지 않았다. 4. 통일품종은 단일품종내에서 6가지의 계통이 분리되었으나 다른 품종에서는 3가지 이내의 계통이 분리되었다. Fifty-one isolates of Xanthomonas oryzae collected from all over the Korean paddy field were classified as the eight different strains by using four different bacteriophage types. Strain-F was the most prevalent form and strain-H,C, and A followed the strain-F, respectively. Strain-D, however, had not found even single isolate although the strain·D is the most prevalent form at Japan and southern countries of Asia. There was no corelation between the type of strains and the area front which the strain had been collected. Six different types of strains were isolated from IR 667 varieties whereas the three strains were maximum that could isolated from single variety other than IR 667

Conceptual Design of a 50-MHz, 300-keV/u CW Heavy Ion RFQ

조용섭,장지호,김한성 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.61

We designed a radio frequency quadrupole (RFQ) that can accelerate 10-keV/u heavy ion beams (hydrogen molecules to uranium) from an ion source and can inject the 300-keV/u beam into a superconducting linac. We chose 50 MHz for the rf frequency and used the PARMTEQM code to create a RFQ structure and to simulate the beam dynamics through the RFQ. The length of the RFQ is 6.3 m, and the transmission rate is 84% for a uranium ion beam. For the structure of a heavy ion RFQ, we can consider a four-vane-type structure, which is efficient for protons, a four-rod-type structure which is compact for heavy ions, and a four-vane-type structure with windows, which is intermediate type. We chose the four-vane-type structure with windows to operate the RFQ in the CW mode.

First Year Operation of the KOMAC

조용섭 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.3

The installation of a 100-MeV proton linac at the Korea Multi-purpose Accelerator Complex(KOMAC) was completed in December 2012, and the 100-MeV linac were successfully commissionedwith user service started in July 2013 through either a 20-MeV beamline or a 100-MeV beamline. In addition, we have accumulated operation data for stabilizin the linac system and the utilities. This paper reports both our experiences that were accumulated during the commissioning and theoperation of KOMAC 100-MeV proton linac and our future plans.