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21세기 전쟁을 통해 본 북한 공격 드론의 전투 양상 전망
서강일,조상근,김종훈,김기원,박상혁 국제문화기술진흥원 2023 The Journal of the Convergence on Culture Technolo Vol.9 No.3
근 드론은 세계의 주요 전쟁에서 주요한 수단 즉 공격드론으로 활용되고 있으며 향후 게임 체인저로 진화할 개연성이 충분해 보인다. 한편 북한이 근래에 들어 무인기를 활용한 도발이 점증하고 있는 현상을 연관 지어 볼 때 한반도에서 공격드론의 등장도 머지 않은 것으로 보인다. 21세기의 주요 전쟁에서 공격드론은 정밀화력유도 또는 자폭공격, 인지전 등의 목적으로 지상 및 공중은 물론 해상 및 수중으로 그 영역이 확장되고 있다. 이러한 공격드론은 다영역작전을 수행할 것이며 이를 위해 자율화 수준을 향상하고 High-Low Mix 개념에 기반한 확장성을 강화하는 등의 발전을 이어나갈 것이다. 북한 또한 오래전부터 공격드론을 운용하기 위해 상당한 노력을 기울여 왔는데 제3국 급조 자폭드론, 인공지능 기반 군집형 자폭드론, 자폭형 스텔스 무인 반잠수정 등의 활동이 예상된다. 이러한 북한의 도발 및 공격 양상과 더불어 우리 군의 대응방안과 활용방안에 대한 활발한 후속연구가 이루어지길 바란다.
색상선별(色相選別) 기술(技術)을 이용(利用)한 고온(高溫) 용융노(熔融爐) 이화재(而火材) 재활용(再活用)에 관(關)한 연구(硏究)
서강일,이덕희,최우진,장정훈,박은규,오용길,Seo, Kang-Il,Lee, Deok-Hee,Choi, Woo-Zin,Jang, Jung-Hoon,Park, Eun-Kyu,Oh, Young-Gil 한국자원리싸이클링학회 2011 資源 리싸이클링 Vol.20 No.1
국내의 경우 내화재는 일정 기간이 지나면 대부분 폐기 처분되고 있으며, 폐기되는 내화재의 50% 이상이 탄화되지 않은 상태이다. 본 연구에서는 내화재를 색상인식 방법으로 선별하여 재활용 가능성을 검토하였다. 선별기 광원의 색온도가 자연광에 가까운 6,500K에서 순도 97.2%의 회수물을 얻었으며, 자연광에 가까울수록 주변 광원의 간섭이 적어 선별효율이 우수한 것으로 조사되었다. 실험결과 투입 컨베이어 벨트의 속도 800 mm/sec에서 순도 98.8%, 회수율 98.1%로 조사되었으며, 시료크기 20~30 mm에서 순도 및 회수율은 각각 98.2%, 98.4%로 조사되었다. 회수물의 순도 및 선별효율은 컨베이어 벨트의 속도가 느릴수록, 시료의 크기가 클수록 향상되는 것으로 조사되었다. 그러나, 본 색상 자동선별 시스템의 처리용량 및 폐내화재의 재활용성 등을 고려할 경우 최적의 선별조건은 색온도 6,500K, 컨베이어 벨트 속도 1,000 mm/sec, 시료 크기 20mm이하인 것으로 판단된다. 카메라 해상도를 고정하고 인지 영역을 좁게 하여 시료 크기 -10 mm, 벨트컨베이어 속도 1,000 mm/sec에서 순도 97%이상, 회수율 및 선별효율이 각각 98%, 96%이상인 것으로 나타났으며, 동일해상도에서 인지영역이 좁을수록 순도 및 선별효율을 높일 수 있는 것으로 조사되었다. More than 50% of refractory materials generated from high-temperature melting furnace was not carbonized and could be recycled by adopting proper separation process. In the present work, the separation of refractory materials has studied by adopting color sorting technology to promote the recycling of waste refractory. Purity of the refractory materials was obtained with at 97.2%, color temperature of sorter light source 6,500K, which gives less interference of surrounding light source. Purity and separation efficiency were improved as size is setting bigger and lower conveyer belt speed. It is revealed that optimum conditions were color temperature 6,500K, conveyer belt speed 1,000 mm/sec, particle size -20 mm, etc. To improve purity and separation efficiency on below 10mm size, the resolution of should be fixed camera and it narrow recognition range. As a result of the study, color sorting technology could be used for separation of waste refractory materials and will contribute to promote the waste recycling.
만성골반통증후군 환자에서 다중 중합효소 연쇄반응을 이용한 미생물 검출의 결과
서강일,황진철,김태완,이수형,박서용,노상휴 대한비뇨의학회 2009 Investigative and Clinical Urology Vol.50 No.11
Purpose: The aim of this study was to evaluate the results of multiplex polymerase chain reaction (PCR) in patients with chronic pelvic pain syndrome (CPPS) and the significance of microorganisms as the causative factor of CPPS. Materials and Methods: We evaluated the frequency of 19 possible causative microorganisms of prostatitis in 849 patients who had prostatitis symptoms from April 2007 to March 2009 by using multiplex PCR. All of the enrolled patients were category III by the definition of the NIH Chronic Prostatitis Workshop. Results: Of the 849 patients, 414 (49%) and 435 (51%) were categories IIIa (inflammatory CPPS) and IIIb (noninflammatory CPPS). On multiplex PCR, using the third voided urine specimen (VB3), 369 (89%) of the 414 category IIIa and 367 (84%) of the 435 category IIIb cases were found to have positive PCR results for causative microorganisms. The common microorganisms were Enterococcus, Ureaplasma urealyticum, Lactobacillus, Streptococcus agalactiae, and Chlamydia trachomatis in 173 (18%), 144 (15%), 129 (13%), 78 (8%), and 69 cases (7%), respectively. Conclusions: There were too many positive PCR results for causative microorganisms in the CPPS patients despite negative urine culture examination. Therefore, it is necessary to rule out contamination of the specimen to achieve reliable results with multiplex PCR. However, multiplex PCR can detect various unknown microorganisms suggestive of the etiology of CPPS, particularly those that are difficult to cultivate. PCR is expected to play an important role in the diagnosis of CPPS, but further studies will be required to define the usefulness of molecular tests. Purpose: The aim of this study was to evaluate the results of multiplex polymerase chain reaction (PCR) in patients with chronic pelvic pain syndrome (CPPS) and the significance of microorganisms as the causative factor of CPPS. Materials and Methods: We evaluated the frequency of 19 possible causative microorganisms of prostatitis in 849 patients who had prostatitis symptoms from April 2007 to March 2009 by using multiplex PCR. All of the enrolled patients were category III by the definition of the NIH Chronic Prostatitis Workshop. Results: Of the 849 patients, 414 (49%) and 435 (51%) were categories IIIa (inflammatory CPPS) and IIIb (noninflammatory CPPS). On multiplex PCR, using the third voided urine specimen (VB3), 369 (89%) of the 414 category IIIa and 367 (84%) of the 435 category IIIb cases were found to have positive PCR results for causative microorganisms. The common microorganisms were Enterococcus, Ureaplasma urealyticum, Lactobacillus, Streptococcus agalactiae, and Chlamydia trachomatis in 173 (18%), 144 (15%), 129 (13%), 78 (8%), and 69 cases (7%), respectively. Conclusions: There were too many positive PCR results for causative microorganisms in the CPPS patients despite negative urine culture examination. Therefore, it is necessary to rule out contamination of the specimen to achieve reliable results with multiplex PCR. However, multiplex PCR can detect various unknown microorganisms suggestive of the etiology of CPPS, particularly those that are difficult to cultivate. PCR is expected to play an important role in the diagnosis of CPPS, but further studies will be required to define the usefulness of molecular tests.
서강일,조상근,김기원,최현호,박상혁 국제문화기술진흥원 2023 The Journal of the Convergence on Culture Technolo Vol.9 No.4
Due to recent small unmanned aircraft threats by North Korea and unsuccessful reponses, severe concerns about future national security have been being increasingly surged. Especially it is notable and unaccpetable to see that North Korea’s small drones flying over capical areas over 7 hours were not efficiently detected and identified even though South Korea already recognized the threats since early 2010s. Meanwhile a US military troop operating THAAD system on Seung-Joo, South Korea successfully shot down unidentified small drone on Jan 2023. The threats caused by small unmanned aircraft is worrisome not only to South Korea, but also to international nations. This paper surveyed US DoD Strategy for countering small aircraft systems and suggest how to improve our current anti-dron systems so that small unmanned aircraft threats will be dynamically diminished or neutralized as fast as we can.