• The Bulletin of The Korean Astronomical Society
• /
• v.36 no.1
• /
• pp.33.1-33.1
• /
• 2011

The plasma sheet of the Earth's magnetosphere is a sheet of hot plasmas in the magnetotail region, dividing the two (northern and southern) lobes of the Earth's magnetic field. It is the key region that is often closely linked to various electromagnetic dynamics in the Earth's magnetosphere-ionosphere system. In particular, it is the region that is most crucial for substorms, which is one of the most dynamic phenomena in the Earth's magnetosphere. The question of substorm triggering remains highly controversial until today, and at the center of the controversy there are several critical physics issues of the plasma sheet. In this talk I will introduce some of the physics issues of the plasma sheet. The specific topics that this talk will cover are (i) the general properties of the plasma sheet, (ii) fast plasma jets and plasma transport problem, (iii) stability/instability problem, and (iv) effects of thin current sheet. I will also present some of our group's recent findings regarding these topics, as obtained by comprehensive analyses of various observational data. The level and content of this talk are designed to be comprehensible to not only space physicists but also the scientists in a related field such as solar and heliospheric physics.

• Proceedings of the KIPE Conference
• /
• 2007.07a
• /
• pp.123-125
• /
• 2007

포항가속기연구소가 추진 중인 제4세대 방사광가속기에는 100 PPM급의 클라이스트론 펄스전압 안정도가 요구된다. 이러한 안정도는 PFN(pulse forming network)에 충전되는 전압을 얼마나 정밀하게 제어하는가에 따라서 결정된다. PFN의 최종운전 전압은 deQing circuit에 triggering되는 시점에 따라서 결정된다. DeQing trigger system은 PFN의 충전전압과 기준전압을 비교하여 충전전압이 기준전압보다 커지는 시점에서 charging choke(충전 쵸크)의 2차에 구성된 deQing 회로의 SCR를 트리거 시켜서 충전 쵸크 1차와 2차의 권선비율이 25:1인 충전 쵸크의 2차를 단락시켜 1차에 흐르는 전류를 2차로 빼주어서 PFN 커패시터에 더 이상 충전되지 않게 하는 구조로 되어있다. DeQing circuit에 triggering되는 시점을 정밀하게 제어하기 위하여 PFN 충전전압을 미분하여 그 출력전압에 비례하여 트리거 출력을 지연시키는 기능과 analog 신호를 digital 신호로 변환하는 기능을 사용하였다. 이 논문에서는 deQing 시스템에 관련된 회로 및 시험결과에 대하여 설명하고자 한다.

• Nuclear Engineering and Technology
• /
• v.35 no.4
• /
• pp.286-298
• /
• 2003

A steam explosion module, STX, has been developed using the mechanistic steam explosion analysis code, TEXAS-V, in order to estimate the dynamic load with steam explosion by implementing the module to the integrated safety analysis code, MELCOR. One of the difficulties in using mechanistic steam explosion codes is that they do not have any obvious criteria for defining some uncertain parameters such as triggering timing, triggering magnitude, mesh axial length and mesh cross-sectional area. These parameters have been user decision parts in the past. Steam explosion sample calculations and sensitivity studies on uncertain parameters were conducted to investigate those uncertain parameters. The TEXAS-V simulations were summarized in the format of a look-up table and a linear interpolation technique was adopted to calculate the steam explosion load between the data points in the table. The STX-module merged with MELCOR showed the same results as the original MELCOR and additionally it could estimate the steam explosion load in the reactor cavity.

• Journal of Acupuncture Research
• /
• v.40 no.2
• /
• pp.162-166
• /
• 2023

This study aimed to demonstrate a safe and effective procedure targeting the A1 pulley with ultrasound-guided acupotomy in patients with a trigger finger. Six ultrasound-guided acupotomy procedures were performed on 1 patient. The Numerical Rating Scale (NRS) score, Quinnell's classification of triggering, Tanaka score, and A1 pulley thickness were measured using ultrasonography before and after treatment. This study revealed reduced NRS score, Quinnell's classification of triggering, Tanaka score, and thickness of the A1 pulley, with no side effects during the procedure. This indicates ultrasound-guided acupotomy as an effective and safe treatment method for patients with a trigger finger. Further studies are required to evaluate the beneficial effects of this treatment.

• The Bulletin of The Korean Astronomical Society
• /
• v.46 no.1
• /
• pp.59.3-60
• /
• 2021

An investigation of flare-producing magnetic structure is important for studying an initiation of eruptive events. In this study we select two different eruptive events, M5.3 and X1.2 flares in active region (AR) 11283. Both events occur in the same AR, but brightenings of flare ribbons, seen in EUV images, are different shapes. In order to understand triggering process of eruptive flares, we reconstruct coronal magnetic fields using two observation-based models: a nonlinear force-free field (NLFFF) extrapolation model and a magnetohydodynamic (MHD) one. The NLFFFs show that sheared arcades and overlying fan-spine configurations are found in both cases, but the distributions of magnetic twist are weaker before the M5.3 flare than before the X1.2 flare. The MHD model is to explore the temporal evolution of coronal magnetic structures by considering the NLFFF with an anomalous resistivity as an initial condition. We discuss possible processes of two eruptive events using the MHD as well as the NLFFF model results.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2009.06a
• /
• pp.245-246
• /
• 2009

• The Zoological Society Korea : Newsletter
• /
• v.12 no.2
• /
• pp.109.1-109
• /
• 1995

No Abstract, See Full Text

• Proceedings of the Zoological Society Korea Conference
• /
• 1995.10b
• /
• pp.245.1-245
• /
• 1995

No Abstract, See Full Text

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2011.06a
• /
• pp.867-868
• /
• 2011

• The Journal of the Korea Contents Association
• /
• v.18 no.2
• /
• pp.344-360
• /
• 2018

The purpose of this study was to investigate the influence of triggering variables, such as personal psychological variables, personal and social environmental variables, related the suicidal ideation, suicidal plan, and suicidal attempt. The subjects were participated in the $6^{th}$(2011) KoWePS. and are analyzed with the statistical program AMOS 21.0 as a calling logistic regression. The major findings were as follows: $1^{st}$, depression, self-esteem, subjective healthful status, marital violence, role of sex were related to suicidal ideation. $2^{nd}$, subjective healthful status and problem-drinking were related to suicidal plan. $3^{rd}$, problem-drinking and marital violence was negative related to suicidal attempt. Finally, on the base of this results, the social welfare implications of this study were discussed to reduce and protect suicidal ideation, suicidal plan, and suicidal attempt. and the limitations of this study and the suggestions for future studies were also presented.