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      • 교합조정이 교근 근전도에 미치는 영향에 관한 연구

        鄭鎭亨 단국대학교 1987 論文集 Vol.21 No.-

        This experiment was performed to study the relationship between masseter muscle activity and occlusal equilibrium. Five dental students who have clicking sound and muscle pain were participated in this experiment. E.M.G. was checked by M.E.M-3102 on bilateral masseter muscles, and mandibular movements were checked by M.K.G. and E.M.G. before and after occlusal equilibrium. Velosities and vertical views were recorded and evaluated. The results were as followings. 1. Muscle activity of masticatory side was elevated than contralateral side before occlusal equilibrium 2. Muscle activity of masticatory side was decrease, and contralateral side was increased after occlusal equilibrium 3. Masticatory cycle pattern was altered after occlusal equilibrium in vertical view.

      • SCIESCOPUSKCI등재

        하악에서 부착치은의 폭경과 소대에 관한 연구

        정진형,Chung, Chin-Hyung 대한치주과학회 1998 Journal of Periodontal & Implant Science Vol.28 No.4

        This study has been done to prove that keratinized gingiva is required for the periodontal health and to analyse the adequate width that is necessary. Until now, the study on frenum has been documented on changing its location. But the location or the formation of the frenum has not been reported. This experiment has used 173 patients from the department of periodontology of Dankook University to investigate the width of keratinized gingiva, the formation of the frenum and its location for the frequency. This study also looks into the relationship between the gingival recession and the structure of the frenum, and affects they have on periodontal health. The width of the keratinized gingiva in the mandible has been found to be highest in the lateral incisor than in the central incisor. The width decreased from the canine to the first premolar until it reached the molar. The interproximal area of the mandibular frenum was 77.9%, which was greater than the frequency (22.1%) from the midline of the teeth. The highest frequency of frenum was at 30.6% in between the both central incisor then second greatest at 20.6% in between the right canine and the right first premolar. Frenum was not found in between the second premolar and the distal area. In the morphology of the frenum, it was found that 43.4% out of 551 parts were found to be a single narrow frenum, and the double or triple ligamented form of the complex frenum were found in similar frequency of 237 parts, but the broad frenum was rarely frequent. The incisal area was popular mostly with the single narrow frenum, the left premolar area frequented 57.4%, and the right premolar frequented 64.7%. Because the distance between the frenum apex and the gingival margin measured to be about 5mm or greater, the frenum apex started in the mucogingival junction and not just below the keratinized gingiva. In the 551 area investigated, 48.3% of gingiva showed recession, incisal area had recession the least at 44.9%, right buccal side at 47.4%, and right buccal side frequented the highest at 52.1%. The teeth that showed recession recessed at the average of 2.151.0.mm and the left canine showed the greatest amount of gingival recession. In the investigation to find out if the keratinized gingiva and the gingiva recession had mutually related somehow, the width of keratinized gingiva showed no affect on the probing depth, but had affected in the gingiva recession. This investigation showed that the gingival recession and the morphology of the frenum related in that, the single narrow frenum had recessed the least and the broad frenum recessed the most. With this analysis, a conclusion was drawn that the morphology of the frenum had affected in the gingical recession.

      • KCI등재

        항공보안장비 성능인증기술 고도화 방안 연구

        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.

      • KCI등재

        근권환경부 측정장치를 이용한 지역별 관수제어 모델링 연구

        정진형,조재현,김승훈,최안렬,이상식 한국정보전자통신기술학회 2021 한국정보전자통신기술학회논문지 Vol.14 No.2

        According to the World Agricultural Productivity Report, the current annual average growth rate of agriculture is 1.63%, which is lower than 1.73% to support the world's 10 billion people, which is growing by 2050. The demand for food, feed, and bioenergy is not growing enough to continue to meet the demand, and it is predicting a future food shortage. The purpose of this study was to create a regional irrigation control model for the purpose of reducing the production cost of crops, increasing production, and improving quality, and presenting a model that can give advice to farmers who start farming in the region. Therefore, through the measurement device of the Ministry of root and Environment, the data of the Ministry of root and Environment of the crop is collected, and the parameters for making an irrigation control model are set, and the data is extracted by applying the parameters to the collected data, and the irrigation of the area where the data is collected A study was conducted to suggest a control model. 세계 농업 생산성 보고서에 따르면 현재 농업의 연평균 성장률은 1.63% 수준으로 2050년까지 증가하는 세계 인구 약 100억 명을 지원하기 위한 성장률 1.73% 보다 낮은 수준이며 이는 세계 농업의 생산성은 2050년까지 세계 인구의 식량, 사료, 바이오에너지 수요를 지속적으로 충족시킬 수 있을 만큼 증가하지 않고 있으며 미래의 식량난을 예고하고 있다. 본 연구는 농작물의 생산비용 감소, 생산량 증대, 품질향상 등을 목적으로 지역별 관수제어 모델을 만들고 해당지역에 농사를 시작하는 농부들에게 조언을 줄 수 있는 모델을 제시하는 것을 목적으로 진행되었다. 이에 근권환경부 측정 장치를 통해 작물의 근권환경부 데이터를 수집하고, 관수제어 모델을 만들기 위한 매개변수를 설정하고, 수집된 데이터에 매개변수를 적용하여 데이터를 추출하고 이를 분석하여 데이터를 수집한 지역의 관수제어 모델을 제시하는 연구를 진행하였다.

      • KCI등재

        iPhone의 SNS 데이터 수집 및 디지털 포렌식 분석 기법

        정진형,변근덕,이상진,Jung, Jin-Hyung,Byun, Keun-Duck,Lee, Sang-Jin 한국정보처리학회 2011 정보처리학회논문지 C : 정보통신,정보보안 Vol.18 No.4

        최근 다양한 스마트폰이 개발 보급되면서 SNS(Social Network Service)를 사용하는 사용자 또한 급격히 증가하였다. SNS는 기존 모바일 기기에서 수집할 수 있었던 문자 및 통화내역과 같은 단순한 사용자 데이터 외에도 주고 받은 사진 및 동영상, 음성쪽지나 위치 공유, 대화 내역 등 다양한 정보가 저장되어 디지털 포렌식 관점에서 유용한 데이터 획득이 가능하다. 본 논문에서는 최근 많이 사용하고 있는 아이폰을 대상으로 스마트폰에서 이용할 수 있는 SNS 클라이언트와 각 클라이언트 별로 수집할 수 있는 데이터의 종류를 살펴본다. 또, 각 데이터간의 연관관계를 통해 수집된 데이터의 효율적인 분석 방법을 제시한다. As a diverse range of smartphones has been recently developed and diffused, the users of SNS (Social Network Service) also have been sharply increased. The SNS saves a variety of information such as exchanged pictures and videos, voice mails or location sharing, chat history, etc. as well as simple user data, so that the acquisition of data that are useful in the aspect of digital forensic is achievable. This thesis reviews the types of SNS that are available for the iPhone, a recent example of highly used smartphones, and types of data by each client. Also, efficient data analysis method for digital forensic investigations is suggested by analyzing the relationships within the collected data by each client.

      • KCI등재

        춘천시의 조경식물의 식재와 이용 현황

        정진형,노희선,이기의,Jeong Jin-Hyung,Noh Hee-Sun,Lee Ki-Eui 한국조경학회 2004 韓國造景學會誌 Vol.32 No.4

        This study was executed to find out how to improve the planting and use of landscaping plants in Chuncheon. The number of street trees was 17,877 in 2003. The major species of street trees were Ginkgo biloba(52.7%), Prunus sargentii(15.3%), Zelkova serrata(8.9%), Platanus occidentalis(7.3%). Salix babylonica and Platanus occidentalis were decreased, while Prunus sargentii and Zelkova serrata were increased. Salix babylonica is a good species for a lakeside city, but its seeds cause allergies to some people. Most of the trees have been removed in Chuncheon. The planting of Salix babylonica(♂) resulted in no problems, and it should be propagated to plant. The soil of several areas was analysed to investigate soil conditions. The outskirts of city had good conditions in pH, organic matter and minerals, but the downtown areas had high alkalic, due to alkali from footpath concrete blocks. Appropriate pruning adds to the aesthetic and prolongs the useful life; it also requires less managing of insects and diseases to maintain good healthy of street trees. Street trees were not properly pruned due to electric lines and shortage of pruning information. The pruning was controlled by Korea Electric Power Co, which has no pruning information. Pruning must be maintained by a professional landscape company to maintain good shape such as with Bonsai. The Shrubs planting zone between street trees and other trees, and preservation plates were established for healthy of street trees. They have to be repaired and maintained well to keep better environmental conditions. The number of tree and flower species of 68 schools in Chuncheon were 12 and 16, respectively. The species that showed high preference were Juniperus chinensis, Pinus koraiensis, Pinus densiflora, Rosa centifolia, Forsythia koreana, and Rhododendron schlippenbachii. The high frequency of the protection trees designated by Chuncheon were Pinus densiflora, Ginko biloba, Zelkova serrata, Quercus species. It was thought that the diversification of street tree species, the selection of street trees suitable to each space, the generalization of use of native species, the appropriate pruning and proper fertilization, the control of pests and diseases, and the opinions of citizens concerning landscape plants were needed to improve the planting, use and maintenance of landscaping plants in Chuncheon.

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