전세계 연해해분들의 생성연대와 기반수심과의 상호관계 및 그들의 구조적 해석 2

박충화 대한지질학회 1992 대한지질학회 학술대회 Vol.1992 No.

시추공 물리탐사를 이용한 동탄성계수와 암상과의 상관성 분석

박충화,박종오,송무영 한국지구과학회 2002 韓國地球科學會誌 Vol.23 No.6

활동적 배호상 해분의 비대칭적 지형과 그들의 구조적 해석

박충화,Park, Chung-Hwa 대한자원환경지질학회 1997 자원환경지질 Vol.30 No.6

Active young back-arc basin such as Mariana, Havre, Lau, Manus, East Scotia basins have asymmetric topography of two types in respect to the spreading axis. The arc-trench wing of Mariana Trough, Lau basin and Havre Trough are shallower toward the active arc, whereas those Manus and East Scotia basins are nearly symmetric to the opposite wings. The other asymmetry which shows the spreading axis deviated from the geographic axis toward the active arc is observed in each basin. Active young back-arc basins show a large variety of asymmetry rates ranging from the lowest East Scotia Basin to the highest Mariana Trough. The asymmetric topography of these young back-arc basins seems to be caused by the rollback rate of downgoing slab under the basin. As the rollback rate increases, the asymmetry rate systematically decreases.

활동적 배호상 해분의 비대칭적 지형에 관한 연구

박충화 대한지질학회 1996 대한지질학회 학술대회 Vol.1996 No.

뉴헤브리디스 해분의 지질학적 특징에 관한 연구

박충화 大田大學校 環境問題硏究所 1997 환경문제연구소 논문집 Vol.2 No.-

The New Hebrides Basin is an inactive non back-arc basin located at the convergent boundary of the Pacific and Indo-Australian plates. This basin was formed from 46 Ma to 60Ma. The basin has two spreading episodes with rates of 34 mm/a for 42 to 47 Ma and 17 mm/a for 47 to 60 Ma. The sediments covered in the basin has uniform thickness of 0.65 sec. The age-depth correlation curve of the New Hebrides Basin can be represented by the following equation: Depth (m) = 2689 + 312 √Age (Ma) The coefficient of 312 in this equation is close to that for major oceans, 350. This suggests that the cooling processes of the lithospheres in the New Hebrides Basin and major oceans are similar to each other. Free-air gravity anomalies of the basin varying from -22.3 mgal to 59.0 mgal. The mean value is 30.2 mgal higher than those of the normal oceans. Moderately large free-air gravity anomalies in the New Hebrides Basin are presumably owing to its location on a marginal swell along the New Hebrides Trench. It is generally observed of the trench axis. Positive free-air gravity anomalies amounting to 50-60 mgal are usually observed on the crest of the swell. This topography is presumably by bending of the oceanic lithosphere so as to dynamically maintain nonisostatic states for some duration.

비정상적 심해성 연해해분에 관한 연구

박충화 大田大學校 環境問題硏究所 1998 환경문제연구소 논문집 Vol.3 No.-

One One remarkable correlation has been noticed with a number of marginal basins are being subducted by itself. For example, extinct Philippine Sea basins are subducted: the West Philippine Basin at the Philippine and Ryukyu Trenches, the Shikoku and Parece Vela Basins at the Nankai Trough. Similar cases are observed in China with the Manila Trench, the South Fiji Basin with two subduction zones: the Hunter subduction zone in the northwestern and of the basin, and the Kadavu subduction zone in the northeastern end of the basin and the Solomon Basin with three subduction zones, the New Britain, the Bougainville and the Trobriand Trenches. All these basin basins are several hundreds meters deeper than the normal oceans. The Sulu and Celebes Basins have traces of past subduction. These basins are also deeper than the normal oceans by about 600 m and 950 m, respectively. Among them fully subducting basins such as the Philippine Sea and Solomon Basin seem to be deeper than partially subducted basins such as the South Fiji and South China Basins. In sharp contrast several marginal basins with depths close to those of the normal oceans are not being subducted at the margin. High density of upper asthenosphere beneath deep back-arc basins is likely to be a necessary condition for occurrence of subduction in such small marginal basins.

활동적 배호상 해분의 Zero Age Depth의 변화에 관한 연구

박충화 대전대학교 환경문제연구소 2001 환경문제연구소 논문집 Vol.5 No.-

Equations of the linear relationship including zero age depths between the basement depth and the square root of age for 6 active back-arc basins, were obtained from the statistical analysis of a great number of underway bathymetric profiles. Active back-arc basins show a large variety of zero age depths ranging from the shallowest Manus Basin to the deepest Mariana Trough. Variations in zero age depth appear to show glood correlations ulith the dipping angle of slab, convergence rate, spreading rate, and cooling coefficient. The dipping angle of subducting slab increases with the increase of the zero age depth. As the convergence rate decreases, the zero age depth also becomes deeper. The variation in zero age depth of active back-arc basin seems to be caused by the mechanical supporting of the subduction slab. Zero age depths are deeper with the decrease of spreading rates and cooling coefficients.

보존용액 처리가 자생 참두메부추(Allium spirale Willd.)와 갯부추(A. pseudojaponicum Makino)의 절화 품질과 수명에 미치는 영향

박충화,김정민,신운섭,장보국,최혁재,임연진 한국화훼학회 2022 화훼연구 Vol.30 No.4

This study was conducted to examine the suitability of Allium spirale Willd. and A. pseudojaponicum Makino as the cut flower by assessing the effect of different holding solutions on vase life, solution uptake rate, and relative fresh weight of the species. After harvest, cut flowers were treated with 50, 75, and 100 mg·L-1 of gibberellic acid (GA3), 25, 50, and 100 mg·L-1 of 8-hydroxyquinoline sulfate (8-HQS), 0.1, 0.3, and 0.5 mM of silver thiosulfate (STS), 8 ml·L-1 of Chrysal, and 10 ml·L-1of Floralife. The vase life of A. spirale flowers was eight days in holding solutions containing 8 ml·L-1 of Chrysal, which was significantly longer than 2.3 days, as observed in the distilled water of control. Chrysal and Floralife significantly extended the vase life of A. spirale and increased relative fresh weight and water uptake using different holding solutions. However, the vase life of cut flower stems did not vary significantly between the other treatments. On the other side, the vase life of A. pseudojaponicum was only extended up to seven days in 100 mg·L-1 GA3 treatment. The vase life of A. pseudojaponicum was similar to or slightly higher than that of the distilled water in other treatments except for the GA3 preservation solution. The cut flower quality and vase life of A. pseudojaponicum were the best in 100 mg·L-1 GA3 treatment. 본 연구는 관상가치가 있는 자생 참두메부추와 갯부추를절화소재로 이용하고자 수행되었다. 실험은 절화가 수확된직후, gibberellic acid(GA3) 50, 75, 100mg·L-1, silver thiosulfate(STS) 0.1, 0.3, 0.5mM, 8-hydroxyquinoline sulfate(8-HQS) 25, 50, 100mg·L-1, 그리고 시중에 판매되고 있는 Chrysal 8mL·L-1, Floralife 10mL·L-1의 보존용액에 처리되었다. 참두메부추의 절화수명 연장에는 Chrysal 보존용액 처리가 가장 효과적이었으며 다음으로 75mg·L-1 GA3 처리가 효과적이었다. 한편 8-HQS와 STS는 참두메부추의절화수명을 단축하고 줄기가 갈변하는 등의 부정적인 영향을끼쳤다. Chrysal과 더불어 Floralife 보존용액 처리는 절화참두메부추의 상대 생체중변화율을 높이는데 효과가 있었다. 반면 갯부추는 100mg·L-1 GA3 처리에서 절화수명이 유일하게 7일까지 연장되었다. GA3 보존용액 처리를 제외한 다른처리에서 갯부추의 절화수명은 증류수인 대조구보다 비슷하거나 약간 높은 수준이었다. 절화 갯부추의 수분흡수율은 실험 초반 100mg·L-1 8-HQS 처리에서, 상대 생체중변화율은Chrysal 보존용액 처리에서 가장 높게 조사되었으나 두 처리 모두 절화수명이 유의하게 연장되지 않았다. 갯부추는100mg·L-1 GA3 처리에서 절화수명을 비롯한 절화품질이 가장 우수하였다.

절개사면에서 전기비저항 토모그래피 적용 기법

박충화,박종오,Park, Chung-Hwa,Park, Jong-Oh 대한지질공학회 2007 지질공학 Vol.17 No.2

To find out the anomalous zone in cut slope composed of phyllite and shist, we performed resistivity tomography using a pole-dipole way. The electrical distribution that propagates from a current source in lower part of slope is measured by a potential electrode in upper part of slope. Apparent resistivity data are inverted with an iterative regularized inversion method to reconstruct 3D resistivity image. By comparing with the resistivity images in relation to each section, the images of anomalous zone correspond to their positions represented in cut slope. Therefore, the application of resistivity tomography in cut slope is useful to recognize the extension of anomalous zone. 천매암 및 편암으로 구성된 기지의 절개사면에서 제시된 이상대는 사면 하단부에 설정된 전류원과 상단부의 전위전극으로 하는 단극-쌍극자 배열을 이용한 전기비저항 토모그래피 방식으로 파악되었다. 해석 방법은 각 측선에서 얻어진 측정 자료를 가지고 3차원 전기비저항 역산 방법으로 하였다. 각 측선에 따른 영상들을 볼 때, 사면의 중앙부에 위치한 단층은 사면에 거의 수직인 방향으로 연장된 영상들로 제시되었다. 수치모델링 결과에서 이상대의 영상들은 절개사면에서 제시된 위치에 매우 정확한 결과들로 보여 주었으며, 단층은 절개사면으로부터 거리가 멀어질수록 지표로부터 그 심도가 깊어지는 경향으로 나타났다.

자생 참두메부추(Allium spirale Willd.)의 효과적인 육묘를 위한 생육환경조건

박충화,김정민,윤새미,임연진,윤미정,장보국 한국화훼학회 2023 화훼연구 Vol.31 No.3

참두메부추(Allium spirale Willd.)는 관상 및 식용식물로서 가치가 높다. 그러나, 참두메부추의 육묘를 위한 생육조건에 관한 연구는 부족한 실정이다. 본 연구는 육묘 플러그셀 크기, 차광율 및 시비처리가 참두메부추의 유묘 성장에미치는 영향을 조사하였다. 실험 결과, 플러그 셀 크기는 용적이 가장 큰 105셀에서 생육이 가장 우수하였다. 생육지표중 초장과 근장은 60% 차광처리에서 상대적으로 높게 측정되어 생육이 우수하였다. 속효성 고형비료[DO-Peters(N:P:K= 20:20:20)는 셀 당 100mg을 시비했을 때 근수와 근장의 수치가 가장 높게 조사되었으며, 속효성 액체비료 Peters(N:P:K= 20:20:20)는 8mL씩 주 2회 시비한 처리구에서 초장과 엽수의 수치가 가장 높았다. 따라서 참두메부추 유묘의 초기 생육에 있어서 속효성 고형비료는 100mg, 액체비료는 8mL를 주2회 시비하는 것이 적절하였다. 참두메부추는 원예상토가 충진된 105셀 플러그 트레이에 종자를 파종한 후 DO-PRO 100mg 또는 Peters 8mL를 주 2회 엽면시비하면서 60% 차광조건에서 재배하는 것이 효과적이었다. Allium spirale Willd. is valuable as it is an ornamental and edible plant. However, the research concerning the growth conditions for raising the seedlings of A. spirale is insufficient. In this study, the effects of seedling plug tray cell sizes, light shading rates, and fertilization treatments on the growth of seedlings were investigated. The growth was the best in the 105-cell plug tray, which had the largest tray volume. Of the growth indicators tested, plant growth and root length were relatively high under 60% shade. Applying 100 mg of the fast-acting coated fertilizer [DO-PRO (N:P:K = 12:8:12 + 6CaO)] per cell resulted in the highest root number and length values. The short-acting liquid fertilizer [Peters (N:P:K = 20:20:20)], when applied at 8 mL twice a week rather than once a week, resulted in an enhanced plant length and increased number of leaves. Therefore, applying 100 mg of the fast-acting solid fertilizer and 8 mL of the short-acting liquid fertilizer per cell twice a week was considered appropriate for the initial growth of seedlings. Thus, the most effective growth conditions were sowing in a 105-cell plug tray filled with horticultural substrate, addition of 100 mg of DO-PRO or 8 mL of Peters twice a week, and cultivation under 60% shading.