와인딩 공정에서 접압롤의 동특성에 관한 연구

김성수,김규태,천성민,신기현 건국대학교 산업기술연구원 1997 건국기술연구논문지 Vol.22 No.-

In a web winding process, the contact roll plays many important roles in air entrainment control and WIT(Wound In Tension) regulation. The behavior of the contact roll significantly affects the winding tension characteristics specifically at the time of contact and separation when the tangential velocities of contact roll and winding roll are not synchronized. A new mathematical model which includes the behavior of the web tension, the winding roll, the carriage and the contact roll is derived for the control of the winding tension. By using the model derived, a non-linear PID(NPID) controller is designed to control the winding tension at the time of contact and separation between the contact roll and the winding roll. Computer simulation study showed that the performance of the winding system with the NPID controller was significantly improved compared with that of a system with PID controller.

경부도상 피판을 이용한 구강내 결손부의 재건

양동규,신상훈,서종천,이성근,김종렬 大韓顎顔面成形再建外科學會 1995 Maxillofacial Plastic Reconstructive Surgery Vol.17 No.3

Various cutaneous as well as myocutaneous flaps have been designed for the reconstruction of tissue defects caused by the excision of oral cancer. Among these flaps, cervical island skin flap have been introduced by Farr et al and more have developed by Tashiro et al. This flap has many advantages. The flap minimizes donor size by use of cervical operation wound, flap size available is adequate for most oral defects and the procedure is relatively simple and time saving. However, this flap is not applicable in patients where there are large tissue defects and metastasis is suspected. We used this flap for it's rapid simple, and effective, primary closure of oral defects after cancer ablation and we have found this flap very useful for the reconstruction of relatively small oral defects.

교맥 에탄올 추출물의 멜라닌생성 억제효과

김대성,노성택,이장천,임규상,신미란,우원홍,문연자 한국전통의학연구소 2006 한국전통의학지 Vol.15 No.1

The aim of this study was to investigate the effect of ethanol extract of Fagopyrum escuentum(FE) on the melanogenesis. To determine whether ethanol extract of FE suppress melanin synthesis in cellular level, B16F10 melanoma cells were cultured in the presence of different concentrations of FE ethanol extract. In the present study, the author examined the effects of FE ethanol extract on cell proliferation, melanin contents, tyrosinase activity. Cell proliferation was slightly increased by treatment with ethanol extract of FE (25-200 ㎍/ml). The ethanol extract of FE effectively suppressed melanin contents at a dose of 100 ㎍/ml. It was observed that the color of cell pellets was totally whitened compared with the control. The ethanol extract of FE inhibited tyrosinase activity, regulate melanin biosynthesis as the key enzyme in melanogenesis. These results suggest that the ethanol extract of FE exerts its depigmenting effects through the suppression of tyrosinase activity. And it may be a potent depigmetation agent in hyperpigmentation condition.

Etching Characteristics of Fission Tracks in Minerals, and Fission Track Dating and Calibration of Zircon

Seong-cheon Shin(辛性天) 대한지질학회 1987 지질학회지 Vol.23 No.1

Thermal and uplift histories of Mesozoic granites in Southeast Korea

Seong-Cheon Shin(신성천),Susumu Nishimura(西村 進) 한국암석학회 1993 암석학회지 Vol.2 No.2

혈액투석을 받는 말기 신부전 환자에서 노쪽피부정맥 변이에 의한 두경부 부종 및 동정맥루 성숙 지연

전성하 ( Seong Ha Cheon ),서용성 ( Yong Seong Seo ),강이화 ( Ea Wha Kang ),신석균 ( Suk Kyun Shin ),강신욱 ( Shin Wook Kang ),최규헌 ( Kyu Hun Choi ),이호영 ( Ho Yung Lee ),한대석 ( Dae Suk Han ),김범석 ( Beom Seok Kim ) 대한신장학회 2006 Kidney Research and Clinical Practice Vol.25 No.3

지구화학적 재해 평가를 위한 지화학도 작성 및 기준치 설정

신성천 ( Seong Cheon Shin ),염승준 ( Seung Jun Youm ),황상기 ( Sang Gi Hwang ) 대한지질공학회 2000 대한지질공학회 심포지엄 Vol.2000 No.-

한반도 동남부의 주단층대에 의해 구분된 지질블록별 백악기-고제3기 화강암의 차별적 냉각-지열 이력

신성천(Seong-Cheon Shin) 한국암석학회 2012 암석학회지 Vol.21 No.3

한반도 동남부의 주단층으로 구분된 지질블록별 백악기-고제3기 화강암체의 피션트랙(FT) 열연대학적 기록은 차별적인 냉각사와 후기 지열사를 입증한다. 대부분 화강암체에는 관입후 단조로운 냉각패턴(J 자-형)이 그대로 보존되어 있으며, 일부 백악기 암체는 300℃ 등온선의 리셋 후 재냉각된 복잡한 패턴(N 자-형)을 기록한다. 각 암체의 온도구간별 차별적 냉각속도는 상대적 암체규모, 모암종류에 따른 초기 열손실, 후기화성활동 존재와 근접성 등에 따라 설명된다. 큰 규모의 저반상 암체의 경우에도 단일 암체 내에서 위치에 따라 각 등온선별 냉각연대는 대체로 부합된다. 양산단층을 가로질러 양쪽에 인접한 두 암체의 유사한 냉각연대는 그들이 거대한 수평변위 이전의 동시대 관입체임을 입증한다. 양산/동래단층 등 주단층대를 따라 국지적으로 기록된 후기 지열상승 범위는 인회석 부분안정영역(70-125℃)에 달했으며 200℃에는 미치지 못하였다. 양산-울산단층 교차점의 파쇄대 내 강한 변질증거는 FT 스핀연대(31Ma)가 전기 올리고세에 단층교차점을 포함한 포항-감포블록의 구조적 침강에 따른 290℃ 이상의 지온상승에 의한 리셋 후 재냉각연대임을 지시하며, 한편 일치된 FT 저콘 및 인회석연대(24Ma)는 올리고세 말기에 동일 지역의 급작스런 구조적 융기에 관련된 200-105℃ 등온선의 급작스런 냉각을 암시한다. 300-200-100℃ 등온선별 냉각연대가 울산단층 동쪽(포항-감포 블록)에서 서쪽보다 현저하게 낮은 경향(FT 스핀 및 K-Ar 흑운모=19%; FT 저콘=20%; FT 인회석=27%)은 훨씬 뒤에 관입한 고제3기 암체의 늦은 냉각시점 때문이며, 후기 지열영향으로 부분감소된 인회석연대가 반영되었기 때문이다. Fission-track (FT) thermochronological records from SE Korean Cretaceous-Paleogene granitic plutons in different fault-bounded blocks reveal contrasting cooling and later thermal histories. Overall cooling patterns are represented by a monotonous (J-shaped) curve in most plutons except some Cretaceous granites retaining a complicated (N-shaped) path due to post-reset re-cooling. Discriminative cooling rates over different temperature ranges can be explained for individual plutons with respect to relative pluton sizes, differences in initial heat loss depending on country rocks, and the presence and proximity of later igneous activity. Even within a single batholith, cooling times for different isotherms were roughly contemporaneous with respect to positions. Insignificant deviations in cooling ages from two different plutons in succession across the Yangsan fault may suggest their contemporaneity before major horizontal fault movement. The extent of later thermal rise recorded locally along the Yangsan and Dongnae fault zones were reached the Apatite Partial Stability Zone (70-125℃), but did not exceed 200oC. Thermal alteration from fractured zones in the Yangsan-Ulsan fault junction may suggest a thermal reset above 290℃ resulting a complete reset in FT sphene age (31 Ma), caused by a tectonic subsidence in Early Oligocene. A consistency in FT zircon/apatite ages (24 Ma) may imply a sudden rapid cooling over 200-105℃, plausibly related to the abrupt tectonic uplift of the Pohang-Gampo Block including the fault junction in Late Oligocene. A remarkable trend of lower cooling ages for 300-200-100℃ isotherms (i.e., 19% for FT sphene and K-Ar biotite; 20% for FT zircon; 27% for FT apatite) from the east of the Ulsan fault (Pohang-Gampo Block) comparing to the west of the fault may be attributed to retarded cooling times from the Paleogene granites and also reflected by their partially-reduced apatite ages due to later thermal effects.

피션트랙 검출기법에 의한 고체 및 액체상태 지질물질의 우라늄 정량과 그 적용성

신성천(Seong-Cheon Shin) 한국암석학회 2015 암석학회지 Vol.24 No.2

피션트랙 검출에 의해 고체 및 액체상태 지질물질 내 우라늄을 정밀정량하는 최적기법을 제안하고 그 적용성을 검증하였다. 우라늄 정량은 중성자 조사에 의해 유도시킨 <SUP>235</SUP>U의 핵분열 흔적을 트랙 디텍터에 기록하여 고배율 현미경 하에서 계수함으로써 이루어진다. 우라늄-친화력이 좋은 암석(예: 화강암, 석탄)을 분말 펠릿시료로 만들어 건식 검출하면, 그다지 높지 않은 우라늄함량(<5 ppm, 즉 ㎍ g<SUP>-1</SUP>)에서도 빈번하게 함유된 함-우라늄광물에 기인한 트랙 군집현상으로 인해 시료의 전체평균 함량 결정이 쉽지 않았으며, 트랙 균질부와 군집부를 별도로 검토해야 한다. 시료의 균질성이 유지된다면 백운모-Lexan 디텍터에 의한 중복 측정과 여러 차례 중성자 조사에 의한 반복 측정에서 높은 재현성이 확인되었다. 건고 액체시료 경우에 10¹ ppm 수준 및 그 이상의 우라늄함량에서 흔히 나타나는 불균질 현상을 극복하기 위해, 진공 석영튜브를 이용한 습식검출법을 제안한다. 습식 검출에서 우라늄 균질성은 10<SUP>0</SUP>ppm 수준 이하에서 회복되며, 측정하한은 10<SUP>-2</SUP> ppb (i.e. ng g<SUP>-1</SUP>) 수준까지 무난한 것으로 입증되었다. The fission track registration techniques for accurate determinations of uranium in solid- and liquid-state geological materials were recommended and their applicability were examined. The determination of uranium can be achieved by optical counting of neutron-induced fission tracks of <SUP>235</SUP>U registered on solid-state track detectors under high magnification. In a dry registration method using powdered pellets of rocks (e.g., granite and coal) showing good uranium-affinity, it was not easy to decide an overall mean concentration over the total sample owing to track-clusters caused by frequent presence of uranium-bearing minerals. Separate scanning for homogeneous and track-clustered parts may be an alternative choice. Assuring the homogeneity over the whole sample, high reproducibilities were confirmed both from duplicate detections using mica and Lexan polycarbonate detectors and from multiple measurements at different thermal neutron fluences. The wet registration method using sealed quartz tubes is recommended to overcome the common heterogeneity in uranium concentrations of 10¹ ppm and more. Adopting the wet registration, the uranium homogeneity was recovered below the 10<SUP>0</SUP> ppm level and the lower detection limit was proved to reach without difficulty the 10<SUP>-2</SUP> ppb (i.e. ng g<SUP>-1</SUP>) level.

Technical evolution of geochemical mapping in Korea

신성천(Seong-Cheon Shin),염승준(Seung-Jun Youm),이평구(Pyeong-Koo Lee),안주성(Joo-Sung Ahn),이진수(Jin-Soo Lee) 대한지질학회 2014 지질학회지 Vol.50 No.5