• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1998.11a
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• pp.123-126
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• 1998

We have conducted surface electrical resistivity surveys along with the electrical logging at Bookil-Myun, Chungwon-Goon, Choongchungbuk-Do to determine the depths of basement and water table, and for the purpose of preparing the basic input data for hydrogeologic model combined with GIS. A twenty lines of dipole-dipole array survey and a twenty-five stations of resistivity sounding were performed and ten holes were employed for electrical logging to cross check the surface data. A combined interpretation gave the quantitative information of the shallow geologic structure over the area and we constructed layers using the grid analysis of Arc/info. The constructed layers were turned out to be similar to the geologic structure confirmed from the drilling data and we concluded that the methodology adopted in this study would be applicable to hydrogeologic model setup as a tool of providing the basic input data.

• Journal of the Korean earth science society
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• v.33 no.5
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• pp.408-421
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• 2012

The objective of this paper is to apply a newly developed wavelet-based semblance filtering and eigenvalue analysis to investigate the geomagnetic variations in some micro-earthquakes that had occurred in the Korean Peninsula. The wavelet-based filtering showed improved results in delineating the geomagnetic variations in relation to earthquake events from their background field. In addition, the eigenvalues analysis was also useful for the interpretation of three components geomagnetic fields during the earthquake events. The wavelet-based semblance analysis showed a prominent result for short-term geomagnetic variation related to the earthquake event, and the eigenvalue analysis was feasible to long-term geomagnetic variation. Considering the fact that the basement rock of the Korean Peninsula has a highly resistive electrical structure, it seems to be possible for small magnitude earthquakes to generate some distinguished geomagnetic variations.

• Proceedings of the KIEE Conference
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• 2009.04a
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• pp.15-17
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• 2009

송전선로 철탑은 비교적 작용하는 하중이 크고 바람과 피빙의 영향을 많이 받는 구조물로써 이를 안정적으로 지탱하기 위해서는 튼튼한 기초를 필요로 한다. 그러나 무근콘크리트 기초는 재료의 특성상 휨인장력에 대하여는 지지력이 없어 철탑기초로는 부적절한 구조물이다. 본 고에서는 무근콘크리트 기초에 대한 철근 콘크리트 보강공법 시공기술에 대하여 고찰하고자 한다.

• Journal of Periodontal and Implant Science
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• v.24 no.3
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• pp.607-617
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• 1994

To determine the effect of tenascin on forming periodontal pocket and pseudopocket, the ginival tissues were surgically obtained from the patients with adult periodontitis(10) and non-inflammatory phenytoin-associated gingival hyperplasia(5). The excised tissue specimens were fixed in neutral formalin for $6{\sim}24$ hours, embedded with paraffin, sectioned at 4-6m in thickness, mounted on glass slides coated with 3-aminopropyltriethoxysilane(Sigma Chemical Co., St. Louis, MO, U.SA.) and immunohistochemically processed by Avidin-Biotin peroxidase complex method for the localization of tenascin, using monoclonal mouse anti-human tenascin antiboday(Chemicon-International Inc., Temecula, CA, U.S.A., 1: 5,000) as the primary antibody. Regardless of periodontal pocket and pseudopocket, tenascin was localized along the connective tissue subjacent to basement membrane of gingival epithelium, and strong positive reactivity was obviously noted in the papillary projections of gingival connective tissue. The results suggest that tenascin may affect the development of papillary projections and the proliferation of epithelial cells.

• Tuberculosis and Respiratory Diseases
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• v.74 no.4
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• pp.151-162
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• 2013

Diffuse alveolar hemorrhage (DAH) is a life-threatening and medical emergency that can be caused by numerous disorders and presents with hemoptysis, anemia, and diffuse alveolar infiltrates. Early bronchoscopy with bronchoalveolar lavage is usually required to confirm the diagnosis and rule out infection. Most cases of DAH are caused by capillaritis associated with systemic autoimmune diseases such as anti-neutrophil cytoplasmic antibody-associated vasculitis, anti-glomerular basement membrane disease, and systemic lupus erythematosus, but DAH may also result from coagulation disorders, drugs, inhaled toxins, or transplantation. The diagnosis of DAH relies on clinical suspicion combined with laboratory, radiologic, and pathologic findings. Early recognition is crucial, because prompt diagnosis and treatment is necessary for survival. Corticosteroids and immunosuppressive agents remain the gold standard. In patients with DAH, biopsy of involved sites can help to identify the cause and to direct therapy. This article aims to provide a general review of the causes and clinical presentation of DAH and to recommend a diagnostic approach and a management plan for the most common causes.

• Parasites, Hosts and Diseases
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• v.50 no.2
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• pp.181-183
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• 2012

The author reported previously on separation of the outer tegument of the spargana (plerocercoids of Spirometra mansoni) using high concentration of urea solution. To determine which layer of the tegument is separated by this method, an electron microscopic analysis has been processed in this study. It was confirmed that the basement layer of the tegument is separated from the parenchyme of the sparganum. In addition, the antigenicity of the separated outer tegument against the human sparganosis patient sera was evaluated. Numerous antigenic proteins, including 16 and 55 kDa proteins, were noticed in the separated tegument; however, there were no diagnostic 31/36 kDa molecules in this tegument. The molecules reactive with the patient sera in the tegument are to be characterized in future studies.

• Proceedings of the KSME Conference
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• 2002.08a
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• pp.711-712
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• 2002

A numerical study of a hemodynamical model for the tumor angiogenesis is carried out. The tumor angiogenesis process is comprised of a sequence of events; secretion of tumor angiogenesis factor(TAF) from the solid tumor, degradation of the basement membrane of nearby blood vessels, migration and proliferation of the endothelial cells. The model takes into account the effect of TAF concentration and endothelial cell density, and their conservation equations are represented as a set of one-dimensional initial boundary value problems. These equations are discretized by using a finite difference method in which the second order schemes both in time and in space are used. The effects of the parameters contained in the model are Investigated extensively through the numerical simulation of the discretized model. The result for the typical case compares very well with the known result.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2001.09a
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• pp.57-64
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• 2001

There are some previous reports that some animals such as rats and birds move in a large group and act abnormally to avoid the large earthquake. This study is to experimentally testify what relations exist between the anomalous animal behavior and electric field effect, which is reported due to the piezoelectric effects in a basement rock before earthquake occurrences. When electric field is applied to the whole bottom of the cage, they show nervous behaviors such as grooming, washing their faces, standing on legs or running around in panic to avoid the electric field. When more strong electric field is applied, they jump with shrieking and mount on the electric line. The rat shows more sensitive anomalous behavior than the bird. Even though the current to the experimental birds and rats is just a few $\mu$A, they react in various ways. The anomalous animal behaviors under the small ground electric field may have some relations to the actual phenomena before great earthquake. This kind of study is quite worthy for the understanding of earthquake precursors.

• 한국지구물리탐사학회:학술대회논문집
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• 2006.06a
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• pp.3-6
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• 2006

There are three types of frequency-domain loop-loop EM induction method, depending on the loop separation and their location relative to the ground surface: horizontal-loop EM (HLEM), fixed small-loop EM, and helicopter-borne EM (HEM) methods. Multidimensional inversion provides tomographic images of the subsurface resistivity structure and thus enhances the interpretational accuracy of loop-loop EM data. HLEM method is shown to be effective for exploring groundwater resources in weathered and fractured crystalline basement terrains in semi-arid regions. Also, HEM method is useful for locating weak zones in landslide areas. The applicability of inversion to small-loop EM data depends solely on the S/N ratio. The quadrature response of small-loop EM data can only give the equivalent conductivity of a homogenous half-space model, and thus the in-phase component is essential in inverting EM data. However, the in-phase response is much lower and decreases more rapidly with decreasing frequency than the quadrature response. Further work is needed to obtain conductivity-depth images from small-loop EM data.

• Journal of Ginseng Research
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• v.22 no.3
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• pp.216-221
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• 1998

We examined the anti-invasive activity of ginsenosides Rhl, Rha on the highly metastatic HT1080 human fibrosarcoma cell line. In vitro invasion assay showed ginsenoside Rhr reduced tumor cell invasion through a reconstituted basement membrane in a transwell chamber more than ginsenoside Rh1. Significant down-regulation of matrix metalloproteinase-9 (MMP-9) by ginsenosides Rh, and Rh2 was detected by Northern blot analysis. However, the expression of MMP-2 was not affected by Rh, and Rhr. The expression of tissue inhibitor of metalloproteinase-2 (TIMP-2) was increased by Rhl after 0.5, 1 or 3 day-treatment but reduced after 6 day-treatment. However, the expression of TIMP-2 was not changed by treatment with Rh2. Plasminogen activator inhibitor (PAI) and urokinase-type plasmlnogen activator (uPA) were not changed by treatment with Rh1 and Rh2 for 3 and 6 days. Quantitative gelatin-based zymography confirmed a markedly reduced expression of MMP-9 but MMP-2 after treatments with ginsenosides Rhl and Rha. These results suggest that down-regulation of MMP-9 contributes to the anti-invasive activity of ginsenosides Rhl and Rhr in the HT1080 cells.