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이온크로마토그래피를 이용한 토양 중 퍼클로레이트 정량에 관한 국제표준(안) 연구
최천일,이군택,박민기,정문주,김지양,강지영,류지영,Choi, Cheon-il,Lee, Goon-taek,Park, Min-ki,Jeong, Moon-ju,Kim, Ji-yang,Kang, Ji-young,Ryu, Ji-young 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.6
Based on the literature study for the determination of perchlorate in soil we chose the ion chromatography as a measurement method and decided to use 70 mM KOH as an eluent to avoid the interference derived from the co-elution of pyrophosphate (P<sub>2</sub>O<sub>7</sub><sup>4−</sup>), tripolyphosphate (P<sub>3</sub>O<sub>10</sub><sup>5−</sup>). Also we proposed to use air dried soil through 0.15 mm sieve and distilled water as an extractant. Under the these basic concepts, we carried out the experiments to set up the detail procedure like solid to liquid ratio (S/L ratio), extraction time, device for extraction and indicating factors for quality control (e.g. precision, accuracy, MDL, LOQ). In case of time and device for extraction, 5 hours of mechanical shaking or 1 hour of centrifugation showed better precision and accuracy than that of sonication for 1 hour According to these results, we proposed the extraction method combining 5 hours of mechanical shaking with 1 hour of centrifugation. From the aspect of S/L ratio, the ratio of 1/2 or 1/3 showed resonable precision and accuracy. In case of the ratio of 1/2, there would be some problems in the separation process when the proportion of fine particle is high. Therefore, we proposed the extraction ratio of solid to liquid as 1/3 instead of 1/2. With the consideration of cost effectiveness and soil salinity, we proposed the use of cartridge for removing the interfering anions like chloride, sulfate and carbonate in specific sample such as saline soil.
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양인근,최천일,김주일,이정훈,김우겸 한국 항공대학교 항공산업기술연구소 1995 航空宇宙産業技術硏究所 硏究誌 Vol.5 No.-
1991년 11월 대한항공이 자체기술로 개발하여 국내 최초로 감항증명을 취득한 창공-91은 5인승으로 왕복운동엔진과 프로펠러를 장착한 다목적 경항공기이다. 1991년 9월부터 1995년 8월까지 4년에 걸쳐 경항공기의 이착륙, 시계 및 계기비행 그리고 비상상황에 대한 훈련을 목적으로 한 창공-91의 FTD (Flight Training Device)가 대한항공에 의하여 개발되었다. 이에 대한 개발목표는 미국 FAA(Federal Aviation Administration)의 AC(Advisory Circular) 120-45A와 40B상의 Level 7급 FTD와 Level A급 Visual System으로 이는 운동판 시스템을 제외하고는 대한항공이 보유하고 있는 AIRBUS A-300 시뮬레이터와 유사한 수준이다. 본 FTD는 비용 대 효과의 비가 우수하며 시스템에 있어서도 확장성과 호환성에 있어서 타 기종에 비해 우수한 시스템을 갖추도록 하드웨어 부품들의 선택으로부터 소프트웨어의 설계/개발에 이르기까지 다양한 노력이 있었다. 순수 국내기술로 독자개발된 하드웨어와 소프트웨어에는 Visual 시현 S/W인 SkyView-I을 비롯하여, Control Loading System, Real-time Scheduler, Real-time Interactive Graphic Solution, Aerodynamics & Engine Model, Instrument Driver, Instructor's Operation Station Menu 등이 포함된다. ChangGong-91, which is developed by Korean Air in November, 1991, is a 5-passenger multi-purpose light aircraft of utility category with a single reciprocating engine, and the first one officially certified by Korean Ministry of Construction and Transportation. The Flight Training Device (FTD) of ChangGong-91 has been developed from September, 1991 to July, 1995 for the purpose of training take off, landing, IFR, VFR and emergency state of the aircraft. The final goal of development is to build a level 7 FTD with a level A visual system satisfying FAA (Federal Aviation Administration) AC (Advisory Circular) 120-40B and 45A which is similar level of AIRBUS A-300 simulator which Korean Air has already possessed, except motion platform system. In order to develop a cost effective FTD with excellent expansibility and compatibility, various efforts have been executed from selection of hardware components to design/development of software modules. The hardwares and softwares developed by our own technology are control loading system, real-time interactive graphic solution, aerodynamics and engine model, instrument driver, and instructor's operation station menu, including visualization software - SkyView-I.
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고속도로 주변 토양의 나트륨흡착비(SAR)를 이용한 제설제 분포 추적
조성현,이동근,신건환,최천일,이군택,김도순,이병덕 한국지하수토양환경학회 2022 지하수토양환경 Vol.27 No.3
The goal of this study was to estimate the possible scattering distance of deicer from the highway and the impact range ofdeicer on soil quality in terms of plant growth. Among the major elements (Ca2+, Cl and Na+) of deicer, Ca2+and Cl areusually applied as fertilizer to soil. Therefore both elements (Ca2+and Cl) were not appropriate for a tracer of deicer at theagricultural area. In this study, SAR (sodium adsorption ratio) of soil was proposed as an alternative tracer to confirm thedistribution of the deicer around the highway areas. Because deicer is the main anthropogenic source of Na+ around thehighway areas and does harm to the physical properties of soil and plant growth through the destruction of soil aggregate,SAR would be an recommendable tracer to access the distribution of deicer as well as adverse effect on soil quality athighway areas. The influence range of deicer based on SAR of soil was estimated to be less than 20 m distance from thehighway even though the possible flying distance of deicer was found to be more than 100 m from the highway. Howeverthe deicer seriously deposited within 10 m from the highway.
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