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성견 치조골 결손부의 치유를 위한 이식재 사용시 치근면 처치 효과에 관한 연구
정진형,김종여,이관훈 단국대학교 치의학연구소 1994 논문집 Vol.6 No.1
Recent research has focused on development of preditable procedures aimed at obtaining new connective tissue attachment to previously diseased root surfaces. Citric acid & tetracycline HCl treatment of exposed root surfaces have been shown to demineralize dentin and thus demineralization of the root surface resulted in greater all attachment. The purpose of this study is to compare the effects of tetracycline HCl and citric acid root treatments on the aspect of apical migration of epithelial cell, the degree of attachment of connective tissue, the new cementum formation & the degree of new alveolar bone formation around the grafted materials. When additionally the root surface is treated with citric acid or tetracycline & the Hydroxyapatite is grafted during the flap operation surgical alveolar defect was formed in lower right & left premolar area of adult dog. Experimental chronic periodontitis is induced by ligation the surgical alveolar defect with orthodontic wire. The control group is only performed flap operation while additional use of tetracycline or citric acid on root surface in the experimental group. Thereafter the experimental animals were sacrificed at 1, 2, 4, 8 weeks. After the histologic assessment was perfomed, the following results were acquired 1. The control group is similar to experimental group by the first week but thereafter apical migration of epithelium were seen and new bone formation were not distinct. 2. The new cementum formation & fibrous connective tissue attachment on the root surface were seen in citric-acid group & tetracyclin group and apical migration of epithelium was very delayed. There was no distinct difference between the two experimental groups. 3. In both group, new bone formation surrounding the graft material was observed but the rate of new bone formation of tetracycline group was superior to the citric acid group.
강원도 내 가로수와 가로녹지대 초화류의 식재 특성에 관한 연구
정진형,이기의,Jeong Jin-Hyung,Lee Ki-Eui 한국조경학회 2005 韓國造景學會誌 Vol.33 No.5
This study surveyed planting areas along streets in Gangwon-do to find out how to improve the planting and use of street trees and herbaceous plants. There were 301,491 trees of 41 species on the streets of Gangwon-do in 2004. The predominant species of street trees were Ginkgo biloba ($40\%$), Prunus spp. (Prunus yedoensis and Prunus sargentii) ($25\%$), Platanus occidentalis ($5\%$), followed by Betula platyphylla var. japonica, Zelkova serrata, Prunus armeniaca var. ansu, Acer palmatum, and Pinus thunbergii. Eighty-four herbaceous plant species were found in the Youngseo district (the southern area of Gangwon-do); the ratio of native species to exotic was 51:33. The predominant species were Cosmos bipinnatus, Petunia hybrida, Tagetes spp., Aster koraiensis, and Fagopyrum esculentum. Eighty-nine herbaceous plant species were found in the Youngdong district (the eastern area of Gangwon-do); the ratio of native species to exotic was 55:33. The predominant herbaceous plants were Aster koraiensis, Tagetes spp., Petunia hybrida, Rudbeckia bicolor, Cosmos bipinnatus, Salvia splendens, Brassica oleraceae var. acephala, Aquilegia buergeriana var. oxysepala, Coreopsis drummondii, Viola tricolor, and Dianthus superbus var. longicalycinus. Appropriate pruning adds to the aesthetic value of trees and prolongs their useful life; it also maintains good health and thereby reduces the need to control insects and diseases. Street trees had not been properly pruned due to the presence of power lines and a shortage of pruning information. The pruning was controlled by Korea Electric Power Company, which has no pruning information. Pruning must be maintained by a professional landscape company in order to maintain good shape, such as that which is done for bonsai. In order to improve the planting, use and maintenance of landscape plants in Gangwon-do, the following recommendations are made: street tree species should be diversified, suitable street trees should be selected for each space, native species should generally be used, trees should be appropriately pruned and properly fertilized, pests and diseases should be controlled, plantings should be done in multiple layers, spatial arrangements should be improved, larger trees should be planted, and drainage and underground electric wires should be considered when planting.
정진형,김기연,윤연아,김나연,심현수,이승훈,하다솜,설은숙,한수진,박수홍,유상우,김용수 한국품질경영학회 2020 품질경영학회지 Vol.48 No.1
Purpose: This study suggests how to upgrade performance certification technology. Current performance certification of aviation security equipment and the requirements thereof were analyzed. Methods: The performance certification of aviation security equipment worldwide and identified issues with the domestic certification system were compared. The government must upgrade certification in terms of technical standards, the assessment methodology used, and the operating system. Results: Three principal conclusions were drawn. First, certification requirements must be based on a review of the technical literature and real-world experience. Second, development priorities must be set by reference to assessment techniques. Third, both research on the certification system and improvements thereof are essential. Conclusion: Certification of aviation security equipment performance requires gradual upgrading.