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최수진(Sunjin Choi),배종희(Jonghee Bae),김은혁(Eunhyeuk Kim) 한국항공우주연구원 2014 항공우주기술 Vol.13 No.1
한국항공우주연구원(이하, 항우연)은 2017년에 시험용 달 궤도선을 2020년에 달 궤도선 및 착륙선 발사를 계획하고 있다. 달 궤도선이 달 궤도 진입(LOI) 기동을 수행할 경우 온 보드에 탑재된 유한 분사 방식의 추력기를 이용하기 때문에 임무계획 단계에서 이러한 내용을 고려하여 LOI 기동 전략을 수립해야 한다. 유한 분사 모델을 이용한 LOI 기동 전략 및 요구되는 속도증분(?V)은 분사시점의 위성 자세, 추진체의 종류, 추력기의 추력 레벨 및 분사 시점에 따라서 달라진다. 본 논문은 해외 우주국 달 궤도선의 LOI 기동 사례를 기술하고, 이를 기반으로 한국형 달 궤도선의 LOI 기동 전략을 구체화 하였다. 또한 이와 관련된 시뮬레이션을 수행함으로써 한국형 달 궤도선에 적합한 추력 레벨 및 분사 시점 등을 도출하였다. Korea Aerospace Research Institute has a plan to launch experimental lunar orbiter in 2017, and lunar orbiter and lander in 2020. In the mission planning phase, LOI(Lunar Orbit Insertion) maneuver strategy should be designed using finite burn model because on-board propulsion system of lunar orbiter in finite burn type. LOI maneuver plan and amount of required ?V using finite burn model depend on the spacecraft attitude at burn, a type of propellant, thrust level and burn timing. This paper describes the LOI maneuver of lunar orbiter of foreign space agency and then comes up with the LOI maneuver plan of Korean lunar orbiter. Adequate thrust level and burn duration of Korean lunar orbiter also present by performing simulation.
SketchiMo : sketch-based motion editing for articulated characters
Choi, Byungkuk,i Ribera, Roger Blanco,Lewis, J. P.,Seol, Yeongho,Hong, Seokpyo,Eom, Haegwang,Jung, Sunjin,Noh, Junyong Association for Computing Machinery 2016 ACM transactions on graphics Vol.35 No.4
<P>We present SketchiMo, a novel approach for the expressive editing of articulated character motion. SketchiMo solves for the motion given a set of projective constraints that relate the sketch inputs to the unknown 3 D poses. We introduce the concept of sketch space, a contextual geometric representation of sketch targets -motion properties that are editable via sketch input-that enhances, right on the viewport, different aspects of the motion. The combination of the proposed sketch targets and space allows for seamless editing of a wide range of properties, from simple joint trajectories to local parent-child spatiotemporal relationships and more abstract properties such as coordinated motions. This is made possible by interpreting the user's input through a new sketch-based optimization engine in a uniform way. In addition, our view-dependent sketch space also serves the purpose of disambiguating the user inputs by visualizing their range of effect and transparently defining the necessary constraints to set the temporal boundaries for the optimization.</P>
Sunjin Park,Hyobi Kim,Byungkook Choi,Chung-Oui Hong,Seon-Young Lee,Inhae Jeon,Su-Young Lee,Pilhee Kwak,Sung-Won Park,Yong-Sang Kim,Kwang-jick Lee 한국동물위생학회 2019 韓國家畜衛生學會誌 Vol.42 No.4
A novel rapid procedure with liquid chromatography tandem mass spectrometry (LC-MS/MS) detection has been developed by changing various conditions including sample preparation such as QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) methodology. This work has been involved the opti-mization and validation of detection method for fluoroquinolones which are widespread used in livestock especially in the chicken. Five grams of homogenized chicken muscle were extracted with QuEChERS EN and acetonitrile containing 5% formic acid and cleaned with anhydrous magnesium sulfate and C18 sorbent. The separation was performed on Acquity UPLC HSS T3 (2.1 mm×100 mm, 1.8 m) column. The mobile phase A and B were composed of water containing 0.1% formic acid and acetonitrile con-taining 0.1% formic acid, respectively. Flow rate was 0.25 mL/min and column temperate was 40°C. LC-MS/MS with multiple reaction monitoring has been optimized for ten fluoroquinolones (ciprofloxacin, danofloxacin, difloxacin, enrofloxacin, marbofloxacin, norfloxacin, ofloxacin, orbifloxacin, pefloxacin and sarafloxacin). The method developed in this study has been presented good linearity with correlation coefficient (R2) of 0.9971∼0.9998. LOD and LOQ values ranged from 0.09 to 0.76 ppb and from 0.26 to 2.29 ppb, respectively. The average recoveries were from 77.46 to 111.83% at spiked levels of 10.0 and 20.0 g/kg. Relative standard deviation (%) ranged 1.28∼11.90% on intra-day and 3.10∼8.38 % on inter-day, respectively. This analysis method was applicable to the livestock residue laboratories and was expected to be satisfactory for the residue surveillance system.
이선진(Sunjin Lee),최상훈(Sang-Hoon Choi) 대한자원환경지질학회 2021 자원환경지질 Vol.54 No.6
동원광상은 옥천대 북서부 태백산분지 내에 분포하는 조선누층군의 변성암류, 퇴적암류 또는 화성암류 내에 발달된 열극을 충진하여 생성된 함 금-은 열수맥상 광상으로, 괴상 및 각력상 조직과 함께 정동의 발달 등 복합적인 조직적 특성을 보여준다. 동원광상의 맥상 광화작용은 지구조적 운동(tectonic break)에 의하여 광화 1시기(stage I)와 광화 2시기(stage II)로 구분된다. 광화1시기는 석영맥의 생성과 함께 주된 함 금·은 광물인 에렉트럼(electrum)과 함께 황화광물, 산화광물 및 황염광물 등이 산출한 시기로서, 공생관계와 광물 조합 특성 등에 의하여 세 단계의 광화시기(초기, 중기, 후기)로 구분된다. 광화 1시기의 초기에는 주로 황철석, 자철석, 자류철석, 유비철석 등이 산출되었다. 중기에는 주된 금-은 광화작용이 진행되어 에렉트럼과 함께 섬아연석, 황동석, 방연석 등의 황화광물과 함 은 광물 및 황염광물 등이 산출되었다. 후기에는 황철석, 섬아연석, 방연석 등과 함께 함은·안티몬 광물 등이 산출되었다. 광화 2시기는 주 광화작용 이후의 금속 광화작용이 이루어지지 않은 방해석과 백운석맥의 생성시기이다. 동원광상 광화작용은 초기 고온(≥430℃)의 열수유체 유입으로 시작되어 냉각과 비등작용 및 상대적으로 천부를 순환한 열수유체 또는 천수의 혼입 등에 의하여 ≥430℃~≤230℃의 온도조건에서 6.0 to 0.4 wt. percent NaCl 상당 염농도를 갖는 유체에서 진행되었다. 동원광상의 광물 공생관계 변화는 이러한 열수계의 진화에 의한 온도와 황 분압 조건의 감소 등의 환경변화가 반영된 결과이다. 동원광상은 한국형 금·은 광상 및 금-은 혼합형 광상에 해당하는 중/천열수 광상에 대비된다. The Dongwon Au-Ag deposit is located within the Paleozoic Taebaeksan province, Okcheon belt. Mineral paragenesis can be divided into two stages (stage I, ore-bearing quartz veins; stage II, barren carbonate veins) by major tectonic fracturing. Stage I, at which the precipitation of major ore minerals occurred, is further divided into three substages(early, middle and late) with paragenetic time based on minor fractures and discernible mineral assemblages: early, marked by deposition of pyrite with minor magnetite, pyrrhotite and arsenopyrite; middle, characterized by introduction of electrum and base-metal sulfides with minor sulfosalts; late, marked by argentite, Cu-As (and/or Sb) and Ag-Sb sulfosalts with base-metal sulfides. Fluid inclusion data show that stage I ore mineralization was deposited between initial high temperatures (≥430oC) and later lower temperatures (≤230oC) from fluids with salinities between 6.0 to 0.4 wt. percent equiv. NaCl. The relationship of salinity and homogenization temperature suggest that ore mineralization at Dongwon was deposited mainly due to fluid boiling, cooling and dilution via influx of cooler, more dilute meteoric waters. Changes in stage I vein mineralogy reflect decreasing temperature and fugacity of sulfur by evolution of the Dongwon hydrothermal system with increasing paragenetic time. The Dongwon deposit may represents a Korean-type and/or Au-Ag type mesothermal/epithermal gold-silver deposit.
Park, Sunjin,Kim, Hyobi,Choi, Byungkook,Hong, Chung-Oui,Lee, Seon-Young,Jeon, Inhae,Lee, Su-Young,Kwak, Pilhee,Park, Sung-Won,Kim, Yong-Sang,Lee, Kwang-jick The Korean Society of Veterinary Service 2019 韓國家畜衛生學會誌 Vol.42 No.4
A novel rapid procedure with liquid chromatography tandem mass spectrometry (LC-MS/MS) detection has been developed by changing various conditions including sample preparation such as QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) methodology. This work has been involved the optimization and validation of detection method for fluoroquinolones which are widespread used in livestock especially in the chicken. Five grams of homogenized chicken muscle were extracted with QuEChERS EN and acetonitrile containing 5% formic acid and cleaned with anhydrous magnesium sulfate and C<sub>18</sub> sorbent. The separation was performed on Acquity UPLC HSS T3 (2.1 mm×100 mm, 1.8 ㎛) column. The mobile phase A and B were composed of water containing 0.1% formic acid and acetonitrile containing 0.1% formic acid, respectively. Flow rate was 0.25 mL/min and column temperate was 40℃. LC-MS/MS with multiple reaction monitoring has been optimized for ten fluoroquinolones (ciprofloxacin, danofloxacin, difloxacin, enrofloxacin, marbofloxacin, norfloxacin, ofloxacin, orbifloxacin, pefloxacin and sarafloxacin). The method developed in this study has been presented good linearity with correlation coefficient (R<sup>2</sup>) of 0.9971~0.9998. LOD and LOQ values ranged from 0.09 to 0.76 ppb and from 0.26 to 2.29 ppb, respectively. The average recoveries were from 77.46 to 111.83% at spiked levels of 10.0 and 20.0 ㎍/kg. Relative standard deviation (%) ranged 1.28~11.90% on intra-day and 3.10~8.38 % on inter-day, respectively. This analysis method was applicable to the livestock residue laboratories and was expected to be satisfactory for the residue surveillance system.