데이터 수집 장치를 이용한 브레이크 시스템 분석

안세영(Seyoung Ahn),한인규(Inkyu Han),심찬보(Chanbo Shim),주영민(Youngmin Joo),이동훈(Donghoon Lee),김동재(Dongjae Kim),이상경(Sangkyung Lee),강성래(Sungrae Kang),김동현(Donghyun Kim),김서영(Seoyoung Kim),최영민(Youngmin Choi) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11

While participating in the 2019 and 2020 KSAE university student car competition, we wanted to drive the formula vehicle we made and convert it into data on how efficient it is. While preparing for the competition, a data logger was built to measure the vehicle’s speed, acceleration, brake pressure, and throttle position. In this paper, we did an analysis with a focus on the brakes. By analyzing these data, we were able to confirm that it was the same as the simulation we expected while building the car, and analyzed that it had better efficiency in 2020 compared to 2019.

Preliminary failure modes and effects analysis on Korean HCCR TBS to be tested in ITER

Ahn, Mu-Young,Cho, Seungyon,Jin, Hyung Gon,Lee, Dong Won,Park, Yi-Hyun,Lee, Youngmin Elsevier 2015 Fusion engineering and design Vol.98 No.-

<P><B>Abstract</B></P> <P>Korean Helium cooled ceramic reflector (HCCR) Test blanket system (TBS), which comprises Test blanket module (TBM) and ancillary systems in various locations of ITER building, is operated at high temperature and pressure with decay heat. Therefore, safety is utmost concern in design process and it is required to demonstrate that the HCCR TBS is designed to comply with the safety requirements and guidelines of ITER. Due to complexity of the system with many interfaces with ITER, a systematic approach is necessary for safety analysis. This paper presents preliminary failure modes and effects analysis (FMEA) study performed for the HCCR TBS. FMEA is a systematic methodology in which failure modes for components in the system and their consequences are studied from the bottom-up. Over eighty failure modes have been investigated on the HCCR TBS. The failure modes that have similar consequences are grouped as postulated initiating events (PIEs) and total seven reference accident scenarios are derived from FMEA study for deterministic accident analysis. Failure modes not covered here due to evolving design of the HCCR TBS and uncertainty in maintenance procedures will be studied further in near future.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Postulated initiating events are identified through failure modes and effects analysis on the current HCCR TBS design. </LI> <LI> A set of postulated initiating events are selected for consideration of deterministic analysis. </LI> <LI> Accident evolutions on the selected postualted initiating events are qualitatively described for deterministic analysis. </LI> </UL> </P>

Accident analysis on LOCA in HCCR-TBS towards CCWS-1

Ahn, Mu-Young,Jin, Hyung Gon,Lee, Youngmin,Cho, Seungyon,Park, Yi-Hyun,Lee, Dong Won Elsevier 2017 Fusion engineering and design Vol.124 No.-

<P><B>Abstract</B></P> <P>Korean Helium Cooled Ceramic Reflector (HCCR) Test Blanket System (TBS) will be operated at elevated temperature with high pressure helium coolant during normal operation in ITER. One of the main ancillary systems of HCCR-TBS is Helium Cooling System (HCS) which play an important role to extract heat from HCCR Test Blanket Module (TBM) by the helium coolant to keep the operational temperature and the extracted heat is finally transferred to ITER CCWS-1 (Component Cooling Water System) by a Printed Circuit Heat Exchanger (PCHE) in the HCS. In such circumstances if Loss Of Coolant Accident (LOCA) occurs in the PCHE, the high pressure helium coolant in the primary side goes into the lower pressure water in the secondary side thus pressurizing CCWS-1. In addition, since the helium coolant contains tritium due to permeation from the TBM, tritium migrates into CCWS-1, a non-nuclear system. In this paper, accident analysis for LOCA in the heat exchanger is presented. For the analysis, GAMMA-FR code which has been developed for fusion applications was used. Main components in the HCS and CCWS-1 were modelled as volume and junctions. The accident analysis was performed for the reference case with ten channels rupture and sensitivity study was also performed by changing the crack size. The results show that pressure and tritium requirement of CCWS-1 can be met in spite of LOCA in the heat exchanger of the HCCR-TBS HCS.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Accident analysis on LOCA in the HCCR-TBS HCS to CCWS-1was performed to assess impact on Component Cooling Water System-1. </LI> <LI> The analysis reveals that impact due to the accident is limited in terms of pressure increase in CCWS-1 and tritium ingress to CCWS-1. </LI> <LI> However, chronical release of tritium from the HCS to CCWS-1 through the heat exchanger should be further clarified. </LI> <LI> This aspect should be reflected in the design of the heat exchanger in future. </LI> </UL> </P>

Properties of CIGS thin films fabricated by sequential NaF doping during 3-stage co-evaporation

Youngmin Shin(신영민),Changsoo Lee(이창수),Donghyeop Shin(신동협),Byungtae Ahn(안병태) 한국신재생에너지학회 2012 한국신재생에너지학회 학술대회논문집 Vol.2012 No.06

Molecular Cloning and NMR Characterization of the Nonreceptor Tyrosine Kinase PTK6 SH3-SH2-Linker Domain

Youngmin Lee,Kyo-Eun Ahn,Sunggeon Ko,이원태 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.5

Human protein tyrosine kinase-6 (PTK6) is a member of the non-receptor protein tyrosine kinase family and it is found in two-thirds of all breast tumors. Very recently, we proposed that the SH3 domain of PTK6 interacts with the linker region (Linker) between the SH2 and kinase domains, proving that the interaction between SH3 domain and Linker plays an important role in auto-inhibition mechanism. Residues from 1 to 191 corresponding region of SH3-SH2-Linker (SH32L) of PTK6 was cloned into the pET32a expression vector with Tobbaco etch virus (TEV) protease enzyme site by sequence homology and 3D structural model. The purified PTK6-SH32L was determined as a monomer conformation in solution. The amide proton resonances in the 15N-1H 2D-HSQC spectrum suggest that PTK6-SH32L possesses disordered structural region of the flexible/unstructured linker region. In addition, the backbone amide proton chemical shifts of the SH3 domain in the PTK6-SH32L differ from that of the independent domain, indicating that intra-molecular interaction between SH3 and Linker in the PTK6-SH32L is present.

신문 매체의 월드 와이드 웹 게시판에 대한 의제설정기능 사례 연구

안영민 영산대학교 2002 영산논총 Vol.10 No.-

The purpose of this study is to grope for possibility of World Wide Web as a alternative media. And the basic hypothesis of this study is that agenda setting function of newspaper is not extant in a bulletin board of World Wide Web. As a result of this research, all hypotheses are accepted. First, agenda setting function of newspaper for issues in a bulletin board is not extant. Second, agenda setting function of newspaper for on-line newspaper is not extant. Finally, agenda settting function of on-line newspaper for issues in a bulletin board is not extant. Therefore, a basic hypothesis of agenda setting function is not applied in user of World Wide Web. These results mean that possibility of World Wide Web as a alternative media is extant.

Electromagnetic analysis on Korean Helium Cooled Ceramic Reflector (HCCR) TBM during plasma major disruption

Lee, Youngmin,Ku, Duck Young,Ahn, Mu-Young,Cho, Seungyon,Park, Yi-Hyun,Lee, Dong Won Elsevier 2015 Fusion engineering and design Vol.98 No.-

<P><B>Abstract</B></P> <P>Korean Helium Cooled Ceramic Reflector (HCCR) Test Blanket Module (TBM) will be installed at the #18 equatorial port of the Vaccum Vessel in order to test the feasibility of the breeding blanket performance for forthcoming fusion power plant in the ITER TBM Program. Since ITER tokamak contains Vaccum Vessel and set of electromagnetic coils, the TBM as well as other components is greatly influenced by magnetic field generated by these coils. By the electromagnetic (EM) fast transient events such as major disruption (MD), vertical displacement event (VDE) or magnet fast discharge (MFD) occurred in tokamak system, the eddy current can be induced eventually in the conducting components. As a result, the magnetic field and induced eddy current produce extremely huge EM load (force and moment) on the TBM. Therefore, EM load calculation is one of the most important analyses for optimized design of TBM. In this study, a 20-degree sector model for tokamak system including central solenoid (CS) coil, poloidal field (PF) coil, toroidal field (TF) coil, vaccum vessel, shield blankets and TBM set (TBM, TBM key, TBM shield, TBM frame) is prepared for analysis by ANSYS-EMAG tool. Concerning the installation location of the TBM, a major disruption scenario is particularly applied for fast transient analysis. The final goal of this study is to evaluate the EM load on HCCR TBM during plasma major disruption.</P>

전립선암의 소분할 방사선치료 시에 위치표지자 삽입의 유용성

최영민(Youngmin Choi),안성환(Sung-Hwan Ahn),이형식(Hyung-Sik Lee),허원주(Won-Joo Hur),윤진한(Jin-Han Yoon),김태효(Tae-Hyo Kim),김수동(Soo-Dong Kim),윤성국(Seong-Guk Yun) 대한방사선종양학회 2011 Radiation Oncology Journal Vol.29 No.2

목적: 전립선암의 소분할 방사선치료에서 골반뼈를 기준으로 한 준비자세(setup)와 전립선에 삽입된 위치표지자(fiducial marker)를 이용한 준비자세를 비교하였다. 대상 및 방법: 2009년 9월부터 2010년 8월까지 전립선암으로 근치적 소분할 방사선치료를 받은 4명의 환자를 대상으로 하였다. 방사선치료 1주일 전경에 경직장초음파 검사 하에 3개의 위치표지자를 직장을 통하여 전립선에 삽입하였다. 방사선치료계획용 컴퓨터단층촬영과 매 방사선치료 전에 직장 관장을 하였다. 소분할 방사선치료는 노발리스 장치를 이용하여, 매일 3.5 Gy씩 총 59.5 Gy를 계획하였다. 분할조사 전에 서로 수직인 두 방향의 kV X-선을 촬영하여 얻은 영상의 위치표지자와 방사선치료계획의 디지털재구성사진에서 관찰되는 위치표지자를 융합하여, 환자의 자세를 조정하고 준비자세를 하였다. 위치표지자 기준 준비자세에서 방사선치료계획의 디지털재구성사진과 kV X-선 영상의 골반뼈를 가상적으로 융합하여, 골반뼈 기준 준비자세를 구하였다. 결과: 67회의 분할조사를 분석하였다. 위치표지자 기준 준비자세에서 방사선치료 중심점과의 3차원적 위치 차이의 평균은 0.94±0.62 ㎜ (범위, 0.09~3.01 ㎜; 중앙값, 0.81 ㎜)였고, 좌우, 상하, 전후 방향으로 위치 차이의 평균은 각각 0.39±0.34 ㎜, 0.46±0.34 ㎜, 0.57±0.59 ㎜였다. 골반뼈 기준 준비자세에서 방사선치료 중심점과의 3차원적 위치 차이의 평균은 3.15±2.03 ㎜ (범위, 0.25~8.23; 중앙값, 2.95 ㎜)였고, 상하 방향의 위치 차이(평균, 2.29±1.95 ㎜)가 전후(평균, 1.73±1.31 ㎜), 좌우(평균, 0.45±0.37 ㎜) 방향보다 유의하게 컸다(p<0.05). 위치표지자 기준 준비자세와 골반뼈 기준 준비자세들에서 방사선치료 중심점과의 3차원적 위치 차이가 3㎜ 이상이었던 경우는 전체 분할방사선조사 횟수의 1.5%와 49.3%였고, 5㎜ 이상이었던 경우가 각각 0%, 17.9%였다. 결론: 위치표지자를 이용하여 보다 정확하게 준비자세를 함으로써 계획용표적체적의 여유를 줄일 수 있고, 따라서 전립선 주변의 정상조직에 대한 방사선량을 감소시켜 보다 안전하게 소분할 방사선치료를 할 수 있을 것으로 예상된다. Purpose: To assess the usefulness of implanted fiducial markers in the setup of hypofractionated radiotherapy for prostate cancer patients by comparing a fiducial marker matched setup with a pelvic bone match. Materials and Methods: Four prostate cancer patients treated with definitive hypofractionated radiotherapy between September 2009 and August 2010 were enrolled in this study. Three gold fiducial markers were implanted into the prostate and through the rectum under ultrasound guidance around a week before radiotherapy. Glycerin enemas were given prior to each radiotherapy planning CT and every radiotherapy session. Hypofractionated radiotherapy was planned for a total dose of 59.5 Gy in daily 3.5 Gy with using the Novalis system. Orthogonal kV X-rays were taken before radiotherapy. Treatment positions were adjusted according to the results from the fusion of the fiducial markers on digitally reconstructed radiographs of a radiotherapy plan with those on orthogonal kV X-rays. When the difference in the coordinates from the fiducial marker fusion was less than 1㎜, the patient position was approved for radiotherapy. A virtual bone matching was carried out at the fiducial marker matched position, and then a setup difference between the fiducial marker matching and bone matching was evaluated. Results: Three patients received a planned 17-fractionated radiotherapy and the rest underwent 16 fractionations. The setup error of the fiducial marker matching was 0.94±0.62㎜ (range, 0.09 to 3.01㎜; median, 0.81㎜), and the means of the lateral, craniocaudal, and anteroposterior errors were 0.39±0.34㎜, 0.46±0.34㎜, and 0.57±0.59㎜, respectively. The setup error of the pelvic bony matching was 3.15±2.03㎜ (range, 0.25 to 8.23㎜; median, 2.95㎜), and the error of craniocaudal direction (2.29±1.95㎜) was significantly larger than those of anteroposterior (1.73±1.31㎜) and lateral directions (0.45±0.37㎜), respectively (p<0.05). Incidences of over 3㎜ and 5㎜ in setup difference among the fractionations were 1.5% and 0% in the fiducial marker matching, respectively, and 49.3% and 17.9% in the pelvic bone matching, respectively. Conclusion: The more precise setup of hypofractionated radiotherapy for prostate cancer patients is feasible with the implanted fiducial marker matching compared with the pelvic bony matching. Therefore, a less marginal expansion of planning target volume produces less radiation exposure to adjacent normal tissues, which could ultimately make hypofractionated radiotherapy safer.

이산화탄소 센서를 이용한 실내 재실자 감지 기술에 관한 연구

지영민(Youngmin Ji),유준재(Junjae Yoo),안주영(Jooyoung Ahn),강정훈(jeonghoon Kang),임호정(Hojung Lim) 한국통신학회 2015 한국통신학회 학술대회논문집 Vol.2015 No.11

Sample holder design for effective thermal conductivity measurement of pebble-bed using laser flash method

Lee, Youngmin,Ku, Duck Young,Park, Yi-Hyun,Ahn, Mu-Young,Cho, Seungyon Elsevier 2017 Fusion engineering and design Vol.124 No.-

<P><B>Abstract</B></P> <P>Since the stress due to the thermal load on breeding blanket structure is one of the main design driver, the thermal conductivity is necessary input data for thermal-structural and thermo-hydraulic analyses performed in order to understand the heat transfer phenomena and estimate the thermal stress. Since for the functional materials of solid type breeding blanket a pebble-bed form is mainly adopted instead of a bulk form such as a block or a disk, it should be needed to measure the thermal conductivity of pebble-bed. In this study, the effective thermal conductivity of pebble-bed is measured by laser flash method, which is one of the various thermal conductivity measurement methods, because this method has several advantages such as a wide thermal conductivity range of the measurement and a small amount of pebbles. A sample holder considering the heat transfer mechanism from the laser source to pebble-bed has been specially designed in order to apply the laser flash technique to the pebble-bed sample and it has been validated by the experiments. This paper introduces preliminary results of the effective thermal conductivity on the pebble-bed using this sample holder.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The effective thermal conductivity of a graphite pebble-bed was successfully measured by Laser Flash Method. </LI> <LI> For the measurement on pebble-bed form, the new sample holder was specially designed. </LI> <LI> The 3-layers measurement technique was designed in order to make the laser flash method successful. </LI> <LI> The effective thermal conductivity of a graphite pebble-bed was converged around 3.2W/mK. </LI> <LI> The effect of the temperature (RT∼200°C) in a graphite pebble-bed was negligible. </LI> </UL> </P>