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곽정민 한국지반공학회 1999 한국지반공학회논문집 Vol.15 No.5
흙의 파쇄성과 관련된 지반공학적 문제에 있어서 입상재료의 강도-변형특성을 해명하기 위한 중요한 인자의 하나로 흙입자의 파쇄를 들 수 있다. 최근, 열대ㆍ아열대 지방의 해안을 중심으로 거대한 해양 유전개발이 진행되고 있으며 이 지역에 넓게 분포된 카보네이트계 모래의 거동이 기존의 실리카계 모래의 거동에 비해 두드러지게 다르다는 것이 현장에서의 문제로 대두되고 있다. 본 연구에서는 흙의 파쇄성과 연관지어 입상재료의 역학특성을 정립하는 첫 단계로서, 흙 입자파쇄의 기본이 되는 개별입자의 파쇄 강도특성을 명백히 하기 위하여 4종류의 서로 다른 모래를 이용하여 단입자 파쇄시험을 수행하였다. 단입자 파쇄강도는 모래의 입자형상, 광물성분 및 입경의 영향을 고려하였으며, 입도분포 곡선의 $D_{50}$에 대응하는 흙입자 강도는 카보네이트성분의 함유량이 많을수록, 입자형상이 뾰족할수록 작은 값을 나타냈다. Particle crushing is an important and essential factor in interpreting the strength and deformation properties of granular materials in the case of geotechnical problems related to soil crushability. As a recent field problem, the exploitation of offshore oil reserves in tropical and sub-tropical coastal shelf areas has shown that the behaviour of soils containing carbonates is markedly different from predominantly silica sands. In this study, as a first step in making a mechanical framework of granular materials incorporating the soil crushability, single particle fragmentation tests were carried out on four different types of sands in order to clarify the characteristics of the single particle fragmentation strength as related to soil crushability. The single particle strength was considered with the influence of the particle shapes, the amount of mineral components and the particle sizes. The soil particle strength corresponding $D_{50}$ of soil distribution curve has shown the lower value, the more the carbonate component and the more angular the particle shape.
곽정민,김형섭 全北大學校 齒醫學硏究所 1990 전북치대논문집 Vol.8 No.1
The application of hydrogen peroxide to gingival tissues has been becoming widely used as part of dental hygiene, but the therapeutic value of hydrogen peroxide in preventing gingivitis has been in dispute. The purpose of this study was compare the difference between daily use of mouthrinse containing 1% and 1.5% hydrogen peroxide with toothbrushing and toothbrushing alone. This experiment was undertaken to compare 3 groups of adolescents received orthodontic treatment with fixed appliances. It was hypothesis that once daily use of mouthrinse containing 1% and 1.5% hydrogen peroxide along with toothbrushing would be better than toothbrushing along in maintaining their periodontal health. The double blind method was used in this study of effect between a mouthwash and a placebo rinse on gingiva. Group Ⅰ (N=14) persons performed toothbrushing with mint-flavored distilled water once daily, while Group Ⅱ (N=14) & Group Ⅲ (N=14) persons performed toothbrushing with 1% & 1.5% hydrogen peroxide. After 2 examiners had taken calibration training, they assessed patient hygiene performance index(PHPI), ginigival index(GI) and papillar bleeding index(PBI) in 4 standard sites per subject. We also noted any generalized mucosal irritations, stain of the teeth and the tongue. The assessment was made baseline and 1, 2, 4, 6 month after mouthrinse. The results of rinsing with 1% & 1.5% hydrogen peroxide didn't reveal significant anti-plaque or anti-gingivitis benifits(P>0.05). No generalized mucosal irritations or clinically significant stain of the tongue or teeth were noted in test groups during the study.
곽정민 한국지반공학회 1999 한국지반공학회논문집 Vol.15 No.5
파쇄성 사질토 지반은 세계각지의 해안을 중심으로 넓게 분포되어 있고, 칼슘성분을 다량 함유한 석회질 모래지반은 입자파쇄의 영향으로 높은 압축성을 나타내는 특징이 있다. 본 연구에서는 모래의 강도-변형특성에 관여하는 입자파쇄의 특성을 명백히 하기 위하여, 세가지 종류의 카보네이트계 모래와 실리카계의 모래를 이용하여 광범위한 응력영역에 대한 등방압축시험을 실시하였다. 다양한 상대밀도에 대한 등방압축 조건에서 압축 항복응력과 입자 파쇄응력과의 관계로부터 파쇄성지표 K를 제안하였다. 제안된 파쇄성지표 K는 흙입자 강도와도 밀접한 관계를 가지며, 흙의 파쇄성을 평가하기 위한 중요한 인자로 사료된다. Crushable sandy soil grounds are widely found along the coast throughout the world. The ground composed of lime sand, which is characterized by the material with high compressibility due to particle crushing contains carbonate calcium. In this study, in order to clarify the characteristics of the particle crushing as related to the strength and deformation properties of sands, isotropic compression test was carried out on three different types of carbonate sands and a silica sand. A crushability index, K, is proposed in connection with the yielding and particle crushing stress of sands at various relative densities under isotropic compression. It is concluded that the representative crushability index, K, associated with the soil particle strength, can be a key factor in preliminary parameters in evaluating soil crushability.
심리적 외상 청소년 심리지원을 위한 심리운동 적용 가능성 탐색
곽정민,김승희 한독심리운동학회 2023 심리운동연구 Vol.9 No.1
This study aimed to explore the possibility as a psychological support method for psychologically traumatized adolescents by analyzing the healing principles of psychomotorik for psychologically traumatized adolescents and examining the applicability. To this end, the concept, causes and symptoms, types and characteristics of psychological trauma were investigated. And based on the research that identified the characteristics and influence of psychologically traumatic adolescents, the possibility of understanding psychomotorik and applying healing principles was explored. 이 연구는 심리적 외상 청소년을 위한 심리운동의 치유원리를 분석하고 적용 가능성을 고찰함으로써 심리적 외상 청소년을 위한 심리지원 방법으로써의 가능성을 탐색하고자 했다. 이를 위해 심리적 외상의 개념, 원인과 증상, 유형 및 특성을 알아 보았다. 그리고 심리적 외상 청소년의 특성과 영향을 파악한 연구를 기반으로 심리운동의 이해 및 치유원리 적용 가능성을 탐색하였다.