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서울, 경기지역의 시나리오별 액상화 위험지도 작성을 위한 지진가속도와 LPI 상관관계 분석
백우현,최재순 한국지반환경공학회 2019 한국지반환경공학회논문집 Vol.20 No.5
On November 15, 2017, a unpredictable liquefaction damage was occurred at the ML = 5.4 Pohang earthquake and after, many researches have been conducted in Korea. In Korea, where there were no cases of earthquake damage, it has been extremely neglectable in preparing earthquake risk maps and building earthquake systems that corresponded to prevention and preparation. Since it is almost impossible to observe signs and symptoms of drought, floods, and typhoons in advance, it is very effective to predict the impacts and magnitudes of seismic events. In this study, 14,040 borehole data were collected in the metropolitan area and liquefaction evaluation was performed using the amplification factor. Based on this data, liquefaction hazard maps were prepared for ground accelerations of 0.06 g, 0.14 g, 0.22 g, and 0.30 g, including 200years return period to 4,800years return period. Also, the correlation analysis between the earthquake acceleration and LPI was carried out to draw a real-time predictable liquefaction hazard map. As a result, 707 correlation equations in every cells in GIS map were proposed. Finally, the simulation for liquefaction risk mapping against artificial earthquake was performed in the metropolitan area using the proposed correlation equations. 2017년 11월 15일 발생한 ML = 5.4의 포항지진으로 액상화 피해사례가 접수되었으며 이에 대한 많은 연구가 수행 중에 있다. 지진에 의한 피해사례가 전무하였던 우리나라의 경우, 예방 및 대비에 해당하는 지진위험지도 작성과 지진 및 지진해일 관측시스템의 구축에 매우 소극적이었다. 지진은 가뭄, 홍수나 태풍 등과 달리, 발생 징후를 관찰하고 그 영향 및 규모를 미리 예측하기란 거의 불가능에 가깝기 때문에 예방 및 대비차원의 액상화 위험지도와 같은 지진재해지도 구축은 매우 효과적일 수 있다. 본 연구는 수도권지역 14,040개의 시추공 데이터를 수집하여 지반증폭계수를 이용한 액상화 평가를 우선적으로 실시하고 최대기반암가속도는 재현주기 200년부터 4,800년을 포함하는 최대기반암가속도 0.06g, 0.14g, 0.22g, 0.30g에 대한 액상화 위험지도를 작성하였다. 또한, 실시간 예측 가능한 액상화 위험지도 작성을 위해 지진가속도와 상관관계 분석을 실시하였으며 그 결과로 수치지도의 모든 셀에 해당하는 상관식이 제안되었다. 최종적으로 제안된 상관식을 이용하여 가상의 지진에 대한 액상화 위험지도를 작성하였다.
Sodium cloxacillin의 유기용매(有機溶媒)에 의한 결정화(結晶化) 및 안정성(安定性)에 관한 연구(硏究)
백우현,김정우,봉득환 대한약학회 1978 약학회지 Vol.22 No.1
The method that changes sodium cloxacillin from amorphous form to hydrate form was investigated. Using organic solvents of which dielectric constants are greater than 9, the amorphous sodium cloxacillin could be changed to hydrate form. The difference of water content of sodium cloxacillin hydrate caused the differences of ir spectrum at $3,350~3,360cm_{-1}$, and owing to the decrease of water content, hydrate form was changed to the morphous form, which could be identified by x-ray diffraction pattern. Regarding the stability of sodium cloxacillin in activity, the hydrate form was stable but the amorphous form was very unstable. Moreover, the stable hydrate form was scarcely hygroscopic, while the other form was hygroscopic, becoming a fused state ar $50^{\circ}$. and R.H. 50%.
Gentamicin Sulfate의 형광분석법에 관한 연구
백우현,김정우,허명권,박근창 대한약학회 1978 약학회지 Vol.22 No.1
Gentamicin sulfate reacted with pyridoxal and zinc (II) ion in pyridine-methanol solution to yield highly fluorescent zinc(II) chelates of N-pyridoxylidene derivatives. This fluorescence reaction was sensitive and showed excitation maximum at 398nm, and emission maximum at 482nm. The effects of reagent concentration, reaction time and temperature, standing time and temperature were studied. And a new fluorophotometric method for the determination of gentamicin sulfate was developed. A good result was obtained and this method was applied to various preparations.
Triethylstannyldiphenylphosphine과 Phenylisocyanate의 반응
백우현,한송윤,이동율 동국대학교 대학원 1973 大學院硏究論集-東國大學校 大學院 Vol.3 No.-
triethylstannyldiphenylphosphine과 phenylisocyanate를 ampoule 속에서 1:10 몰비로 하여 여러 온도로 나누어 반응시켰다. 이들 반응에서 diphenylcarbodiimide 는 놀랍게도 저온 반응에서 phenylisocyanate 의 2량체인 N, N-diphenyluretidine-2,4-dione 과 함께 생성되었고, 고온 반응에서는 1,3,5-triphenyl-4-phenyliminohexahydro-1,3,5-triazine-2,6-dione 이 carbodiimide와 3량체인 triphenylisocyanurate과 함께 생성 되었다. 그러나 실은 반응에서 는 3량체만을 얻을 수 있었다. triethylstannyldiphenylphosphine은 모든 반응에서 상기 반응생성물의 생성촉매로 적용되었다. Reactions of triethylstannyldi phenylphosphine with phenylisocyanate were carried out at various temperatures in ampoules. In these reactions diphenylcarbodiimide surprisingly yielded with N,N-diphenyluretidine-2,4-dione, cyclic dimer of pheny-lisocyanate at low reaction temperature and 1,3,5-tripheny1-4-phenyliminohexahydro-1,3,5-triazine-2.6-dione with carbodiimide and cyclic trimer triphenylisocyanurate at high condition. But at room temperature, we got only phenylisocyanurate. Triethylstannyldiphenylphosphine was used a catalyst for the formation of the above compounds.