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김미경,조병훈,김동규,윤선종,임채미,박수정,김희진,김연희,김수연,윤소미,권진욱,손성완,정갑수,이주호,강문일,Kim, MeeKyung,cho, Byung-Hoon,Kim, Dong-Gyu,Yun, Seon Jong,Lim, Chae-Mi,Park, Su-Jeong,Kim, Heuijin,Kim, Yeon Hee,Kim, Soo-Yeon,Yun, So Mi,K 대한수의학회 2006 大韓獸醫學會誌 Vol.46 No.4
Residual materials such as veterinary drugs, environmental contaminants, and pesticides are affecting food safety. High resolution techniques and quality controls are needed to analyze these materials from part per million to part per trillion quantities in food. In order to achieve quality results, standardized methods and techniques are required. Our laboratories were prepared to obtain a certificate of accreditation for ISO/IEC 17025 in the analytical criteria of animal drugs, dioxins, pesticides, and heavy metals. ISO together with IEC has built a strategic partnership with the World Trade Organization with the common goal of promoting a free and fair global trading system. ISO collaborates with the United Nations Organization and its specialized agencies and commissions, particularly those involved in the harmonization of regulations and public policies including the World Health Organization and CODEX Alimentarius for food safety measurement, management and traceability. Our goal was to have high quality analysts, proper analytical methods, good laboratory facilities, and safety systems within guidelines of ISO/IEC 17025. All staff members took requirement exams. We applied proficiency tests in the analysis of veterinary drugs (nitrofuran metabolites, sulfonamide and tetracyclines), dioxins, organophosphorus pesticides, and heavy metals (Cd, Pb, As) to the Food Analysis Performance Assessment Scheme (FAPAS) at Central Science Laboratory, Department for Environment Food and Rural Affairs (DEFRA), England. The results were very satisfactory. All documents were prepared, including system management, laboratory management, standard operational procedures for testing, reporting, and more. The criteria encompassed the requirements of ISO/IEC 17025:1999. Finally, the Korea Laboratory Accreditation Scheme (KOLAS) accredited our testing laboratories in accordance with the provisions of Article 23 of the National Standards Act. The accreditation will give us the benefit of becoming a regional reference laboratory in Asia.
Heuijin Lim,Sang Koo Kang,Hee Chang Kim,Seung Heon Kim,Dong Eun Lee,Sang Jin Lee,Jungyu Yi,Kyoung Won Jang,Dong Hyeok Jeong,Man Woo Lee 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.7
The 6-MeV C-band standing-wave accelerator was constructed in 2015 and is providing for the beam service. The new 9-MeV accelerator was designed and constructed in 2018 at the Dongnam Institute of Radiological & Medical Sciences (DIRAMS), Busan, Korea. The 5712 MHz accelerating column was designed with an average accelerating gradient of 16.7 MV/m at a pulsed resonance frequency (RF) power of 2.5 MW. The C-band coaxial magnetron was chosen for its high RF power of 2.5 MW and RF frequency of 5712 ± 10 MHz. While the 6-MeV accelerator was operating using a magnetron manufactured by BVERI, China, the 9-MeV accelerator uses a magnetron manufactured by CPI, USA. Though the CPI magnetron requires more heating power and precise heating control for high repetition operation, the frequency spectrum and the RF power distribution are satisfactory for our accelerating columns. The magnetron installed on the 9-MeV accelerator was tested with the 6-MW pulse modulator based on the thyratron-switched pulse-forming network and is currently operating for accelerator RF conditioning. In this paper, we present a brief description of the 9-MeV accelerator, the integration of the RF transport systems and the commissioning status. We also discuss the results obtained during the early commissioning and future plan.
가정 밖 청소년들의 자립 모색 과정에 대한 질적 연구: 청소년복지시설 청소년을 중심으로
김은정(Kim, Eunjung),백혜정(Baek, Hye-Jeong),김희진(Kim, Heuijin) 한국청소년정책연구원 2019 한국청소년연구 Vol.30 No.2
본 연구는 전국의 청소년복지시설을 이용하거나 이곳에서 생활하는 만 15세 이상 24세 미만의 청소년 30명을 대상으로 인터뷰 조사를 실시하여 가정 밖 청소년들의 자립 모색 과정을 분석하였다. 수합된 자료는 Strauss & Corbin(1990)의 근거이론을 기반으로 개방코딩, 축코딩, 선택코딩의 분석과정을 거쳤다. 분석결과, 이들은 ‘1차 사회화 환경의 붕괴(인과적 조건)’로 인해 가정과 학교에서 제대로 된 보살핌을 받지 못하고 있었고 그 결과 집을 나와 길거리 생활, 아르바이트, 빚/범죄에의 연루 등 ‘한국사회의 통상적인 청소년 사회화 과정 밖에서의 삶(맥락적 조건)’을 살고 있었다. 이러한 생활을 하다가 ‘시설 생활을 시작(중심현상)’하여 신체적, 심리적 휴식 및 안정을 갖게 되면서 전환의 계기를 갖게 된다. 또한 시설을 통해 학업지도, 심리상담, 취업 관련 프로그램 등의 다양한 ‘지원 및 지지(중재적 조건)’를 받게 되면서 청소년 자신도 ‘자립을 위한 노력과 시도(작용/상호작용)’를 하게 되어 자립(결과)할 수 있는 기반을 다지게 된다. 그러나 모든 가정 밖 청소년들이 이러한 단계를 순차적으로 밟아 가면서 자립을 위한 기틀 마련이라는 성공적인 결과를 갖게 되는 것은 아니었다. 각 단계마다 가정 밖 청소년들이 그 다음 단계로 나아갈 수 없는 다양한 난관이 있으며 이에 부딪혀 좌절하고 방황하면서 자립 의지가 꺾이기도 한다. 그러므로 가정 밖 청소년들을 위한 정책제안은 이들의 자립과정을 지원하는 것을 목표로 하여 각 단계에 존재하는 난관과 장애물을 어떻게 통제할 것인가를 중심으로 이루어져야 할 것이다. 본 연구에서는 가정 밖 청소년들이 처한 다양한 상황을 바탕으로 이들의 자립을 지원 할 수 있는 정책을 제안하였다. This study analyzed how 30 runaway and homeless youths residing in the youth welfare service centers had achieved self-reliance using grounded theory. Most interviewees ran away because they had been ‘badly cared and/or abused in their families and schools(Condition)’. They had moved out of home for safety, but instead ended up getting involved in violence, debt and crime and became homeless and were ‘off the normalized socialization track(Contexts)’. They were ‘admitted to the youth welfare service centers(Phenomena)’ and took it as an opportunity to change their lives. ‘Resources and support(Intervening Conditions)’ provided by the centers helped them to ‘search for a strategy(Strategies)’ to achieve ‘self-reliance and a successful transition to adulthood(Consequences)’. This study also discussed the policy implications of helping homeless teenagers to deal with the difficulties which they might have experienced in pursuing their goals of self-reliance.
Fabrication and Cold Test of a 9-MeV C-Band Accelerating Column
Seung Hun Kim,Sang Koo Kang,Dong Eun Lee,Sang Jin Lee,Hee Chang Kim,Jungyu Yi,Kyoung Won Jang,Dong Hyeok Jeong,Heuijin Lim,Man Woo Lee 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.7
A 9-MeV electron linear accelerator based on C-band microwaves for medical applications is being assembled at the Dongnam Institute of Radiological and Medical Sciences (DIRAMS). The accelerating column has an on-axis coupled structure and will be operated with a π/2-mode standing wave. Parameters of the cavities are selected based on simulations with CST MICROWAVE STUDIOⓇ (CST MWS), and the cold test and micro-machining are performed to obtain the desired RF characteristics of the cavity. Then, the bead-pull test is conducted to measure the RF properties of the full accelerating column structure. The fabrication of the C-band accelerating column and the results of the low-power RF tests are discussed.
김미경,윤선종,김동규,봉영훈,김희진,장정희,정갑수,Kim, MeeKyung,Yun, Seon Jong,Kim, Dong-Gyu,Bong, Young-Hoon,Kim, Heuijin,Jang, Jung-Hee,Chung, Gab-Soo 대한수의학회 2008 大韓獸醫學會誌 Vol.48 No.2
Pesticides are extensively used for the control of crop pests in agriculture and forestry. Organophosphate (OP) and carbamate pesticides are especially effective for the control of a variety of harmful insects. However, these cholinesterase inhibitors are also dangerous to non-target organisms (wildlife and other animals) because of their high acute toxicity. Most poisonings by pesticides occur as a result of misuse or accidental exposure, but intentional killing of unwanted animals also occurs. At the request of a local autonomous entity, we investigated wild bird poisonings by pesticides from 2003 to 2007. The 207 suspicious samples of pesticide poisoning based on the necropsy were analyzed by GC/NPD, GC/FPD, or GC/MSD. We looked for trends in the identification of pesticides in wild birds thought to have died from poisoning. Pesticides were determined in 59% of the total samples analyzed. Phosphamidon and monochrotophos were the most common pesticides identified, which amounted to 77% of the subtotal. Other OP and carbamate pesticides were also found in various concentrations from dead wild birds. The determined rates of pesticides were as high as 86% and 76% in 2003 and 2006, respectively, during an outbreak of avian influenza in Korea.
The Electronics system of the Ultra Fast Flash Observatory Pathfinder
김지은,최지녕,최연주,정수민,정애라,김민빈,김석환,김예원,이직,임희진,민경욱,나고운,박일흥,서정은,Kim, Ji Eun,Choi, Ji Nyeong,Choi, Yeon Ju,Jeong, Soomin,Jung, Aera,Kim, Min Bin,Kim, Sug-Whan,Kim, Ye Won,Lee, Jik,Lim, Heuijin,Min, Kyung Wook,N 한국천문학회 2012 天文學會報 Vol.37 No.2
The Ultra Fast Flash Observatory (UFFO) pathfinder consists of the UFFO Burst Alert X-ray Trigger telescope (UBAT) and the Slewing Mirror Telescope (SMT). They are controlled by the UFFO Data Acquisition system (UDAQ). The UBAT triggers Gamma-Ray Bursts(GRBs) and sends the position information to the SMT. The SMT slews the motorized mirror rapidly to the GRB position to take the UV/Optical data within a second after trigger. The UDAQ controls each instrument, communicates with the satellite, collects the data from UBAT and SMT, and transfers them to the satellite. Each instrument uses its own field programmable gates arrays (FPGA) for low power consumption and fast processing, and all functions are implemented in FPGAs without using microprocessors. The entire electronics system of the UFFO pathfinder including architecture, control, and data flow will be presented.
최지녕,최연주,정수민,정애라,김민빈,김지은,김석환,김예원,이직,임희진,민경욱,나고운,남지우,박일흥,서정은,Choi, Ji Nyeong,Choi, Yeon Ju,Jeong, Soomin,Jung, Aera,Kim, Min Bin,Kim, Ji Eun,Kim, Sug-Whan,Kim, Ye Won,Lee, Jik,Lim, Heuijin,Min, Kyung Wo 한국천문학회 2012 天文學會報 Vol.37 No.2
UFFO Burst Alert & Trigger telescope (UBAT) is one of major instruments of UFFO-Pathfinder. The UBAT aims at 10 arcmin resolution localization of Gamma Ray Bursts with X-ray coded mask technique. It has $400mm{\times}400mm$ coded mask aperture, hopper, shielding and detector module with effective area of $191cm^2$. The detector module consists of an assembly of 36 64-ch MAPMTs and $25mm{\times}25mm$ pixellated YSO crystal array, and associated analog and digital electronics of about 2500 channels. We performed a vibration test using a dummy MAPMT with the detector module structure to measure the indused stress applied onto the MAPMT. We designed a sub-structure on the detector module to avoid the resonance that would otherwise deforms the detector module structure. A finite element analysis confirms the reduction of the load acceleration down to 12g. The experimental results are to be reported. Consequently, it proves that the MAPMT arrays of the flight UBAT detector module structure would survive in the space launch environment.
The Burst Alert and Trigger Telescope for the Ultra Fast Flash Observatory Pathfinder
나고운,최지녕,최연주,정수민,정애라,김지은,김민빈,김석환,김예원,이직,임희진,민경욱,박일흥,서정은,Na, Go Woon,Choi, Ji Nyeong,Choi, Yeon Ju,Jeong, Soomin,Jung, Aera,Kim, Ji Eun,Kim, Min Bin,Kim, Sug-Whan,Kim, Ye Won,Lee, Jik,Lim, Heuijin,Min, 한국천문학회 2012 天文學會報 Vol.37 No.2
The Ultra Fast Flash Observatory (UFFO) pathfinder is a payload system on-board the Russian satellite Lomonosov, scheduled to be launched in 2013. The main purpose of the UFFO pathfinder is to observe the early photons from Gamma-Ray Bursts. It consists of two instruments. The first instrument is the UFFO Burst Alert X-ray Trigger telescope (UBAT) for the fast-trigger and detection of GRB location, and the second is the Slewing Mirror Telescope (SMT) for the observation of the UV/optical afterglow from the GRB located by the UBAT. It will provide the first-ever systematic study of UV/optical emission far earlier than 1 sec after trigger. We will present the design, fabrication and the preliminary performance of the UBAT.
The Slewing Mirror Telescope of the Ultra Fast Flash Observatory Pathfinder
정수민,최지녕,정애라,김민빈,김석환,김예원,김지은,이직,임희진,나고운,남지우,박일흥,서정은,Jeong, Soomin,Choi, Ji Nyeong,Jung, Aera,Kim, Min Bin,Kim, Sug-Whan,Kim, Ye Won,Kim, Jieun,Lee, Jik,Lim, Heuijin,Na, Go Woon,Nam, Jiwoo,Park, Il Hung 한국천문학회 2012 天文學會報 Vol.37 No.2
The Slewing Mirror Telescope (SMT) is a key telescope of Ultra-Fast Flash Observatory (UFFO) space project to explore the first sub-minute or sub-seconds early photons from the Gamma Ray Bursts (GRBs) afterglows. The first realization of UFFO is the 20kg UFFO-Pathfinder (UFFO-P) to be launched on board the Russian Lomonosov satellite in 2013 by the Soyuz-2 rocket. Once the UFFO Burst Alert & Trigger Telescope (UBAT) detects the GRBs, Slewing mirror (SM) will rotate to bring the GRB into the SMT's field of view instead of slewing the entire spacecraft. SMT can image the UV/Optical counterpart with about 4-arcsec accuracy. However it will provide a important understanding of the GRB mechanism by measuring the sub-minute optical photons from GRBs. SMT can respond to the trigger over $35^{\circ}{\times}35^{\circ}$ wide field of view within 1 sec by using Slewing Mirror Stage (SMS). SMT has 10-cm Ritchey-Chretien telescope and $256{\times}256$ pixilated Intensified Charge-Coupled Device (ICCD) on focal plane. In this paper, we discuss the overall design of UFFO-P SMT instrument and payloads development status.