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CBCT 영상에서 무치악부 임프란트 매식체 주위골 골밀도(HU)의 정량적 평가
구종국,김진수,김재덕 대한구강악안면방사선학회 2008 Imaging Science in Dentistry Vol.38 No.1
Purpose : The primary aims of this retrospective study were to compare subjective bone quality and bone quality based on the Hounsfield scale in different segments of the edentulous jaw, and to establish quantitative and objective assessment of the bone quality. Materials and Methods : Twenty eight randomly selected cone-beam computed tomographic (CBCT) scans were analyzed. For evaluation one hundred and twelve edentulous areas were selected. Implant recipient sites were evaluated visually for Lekholm and Zarb classification. The same sites were subsequently evaluated digitally using the Hounsfield scale with Vimplant2.0, and the results were correlated with visual classification. Data was subject for statistical analysis in order to determine correlation between recorded HU and the regions of the mouth with the Kruskal-Wallis test. Results : The highest unit/mean density value (311 HU) was found in the anterior mandible, followed by 259 HU for the posterior mandible, 216 HU for the anterior maxilla, and 127 HU for the posterior maxilla. These results demonstrate a strong correlation for HU depending on the region of the mouth (p<0.001). The relationship between HU and type 4 bone was found to be significant (r=0.74). Conclusion : Knowledge of the Hounsfield value as a quantitative measurement of bone density can be helpful as a diagnostic tool by using CBMercuRay with Vimplant software.
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치과용 콘빔CT영상에서 미니임플란트를 위한 협측피질골 두께
구종국,임성훈,이병진,김재덕,Goo, Jong-Gook,Lim, Sung-Hoon,Lee, Byoung-Jin,Kim, Jae-Duk 대한영상치의학회 2010 Imaging Science in Dentistry Vol.40 No.4
Purpose : Cortical bone thickness is one of the important factor in mini-implant stability. This study was performed to investigate the buccal cortical bone thickness at every interdental area as an aid in planning mini-implant placement. Materials and Methods : Two-dimensional slices at every interdental area were selected from the cone-beam computed tomography scans of 20 patients in third decade. Buccal cortical bone thickness was measured at 2, 4, and 6 mm levels from the alveolar crest in the interdental bones of posterior regions of both jaws using the plot profile function of $Ez3D2009^{TM}$ (Vatech, Yongin, Korea). The results were analyzed using by Mann-Whitney test. Results : Buccal cortical bone was thicker in the mandible than in the maxilla. The thickness increased with further distance from the alveolar crest in the maxilla and with coming from the posterior to anterior region in the mandible (p<0.01). The maximum CT value showed an increasing tendency with further distance from the alveolar crest and with coming from posterior to anterior region in both jaws. Conclusion : Interdental buccal cortical bone thickness varied in both jaws, however our study showed a distinct tendency. We expect that these results could be helpful for the selection and preparation of mini-implant sites.
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서종국(Jong Gook Seo)(徐鍾國) 위기관리 이론과 실천 2013 Crisisonomy Vol.9 No.12
본 연구의 목적은 통행행태와 거주이전과의 관계를 분석하는데 있다. 통근행태와 입지선택인 거주이전과의 관계에 관한 다양한 이론과 실증적인 선행연구를 고찰하였고 이를 통하여 가설을 설정하고 우리나라 통근자들에 대한 실증분석을 통해 규명하였다. 2000년과 2005년 인구주택센서스 자료를 이용하여 거주지 변화와 통행수단 선택에 대해 이항프로빗모형을 추정하였다. 연구결과는 다음과 같다. 거주지변화와 통근수단선택에 있어서 개인별 사회경제적 변인들은 통계적으로 유의하면서 각기 정(+) 또는 부(-)의 일관성 있는 관계를 나타냈다. 거주지 변화 변수와 통근수단 변수는 각기 입지패턴과 통행행태의 대체로써 서로 상호작용하면서 영향을 주고 받는 것으로 나타났다. 개인들이 생활하는 도시의 특성에 대한 가치를 어떻게 평가하느냐에 따라서 교통수단의 선택은 달라진다는 것이다. 또한 교통수단의 선호도에 따라서 주거입지선택의 결과도 다르게 나타날 것이고 반대의 현상도 나타날 가능성도 있다는 것이다. 통근자들은 통행행태와 거주지 변화를 동시에 고려하면서 자기강화적인 선택을 한다는 것을 규명하였다. The purpose of this study was to analyze the relationship between commuting behaviors and residential relocation. Theoretical and empirical research on the leading hypothesis concerning on the relationship between travel behaviors and residence location choice was investigated, and set the hypothesis to test by this empirical study. Using Population and Housing Census Data for 2000 and 2005 binomial probit model was estimated for residential changes and travel mode. The results are as follows. In model of changes in residence and commute mode choice, individual socio-economic variables are statistically significant, while each positive (+) or negative (-) showed a consistent relationship. Changes in residence and commuting mode choice interact with each other as replacement variables for location pattern and travel behavior. The travel mode choice are depending on how individuals rate the vale on characteristics in the city. In addition, residence choice are depending on the preference of commuting mode. Commuters have taken into account the changes in behavior and residential choice at the same time that self- reinforcing.
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서종국(Jong Gook Seo)(徐鍾國) 위기관리 이론과 실천 2011 Crisisonomy Vol.7 No.2
본 연구의 목적은 그동안 도시재생의 지배적인 이론적 기초인 압축개발에 대한 대안을 모색하여 제시하는데 있다. 뉴어바니즘에 대해 고찰하고 정책을 비교평가 하였고 새로운 시장 지향적 접근방향을 모색하여 제시하였다. 연구결과는 다음과 같다. 뉴어바니즘의 정책 효과는 기대에 크게 미치지 못하고 있는 실정이다. 이는 근본적으로 도시의 특성을 제대로 반영하지 못하는 초 이상적인 이론적 기초를 두고 있기 때문이다. 도시공간에 입지하고 있는 다양한 시설과 활동 같은 자본은 쉽게 그 근본적인 변화를 가져오기가 쉽지 않다. 뉴어바니즘은 도시민의 주거선호도를 무시하고 역행하는 물리적 도시구조의 변화를 주창하고 있다. 수요와 공급에 의한 도시토지시장의 효율성을 무시하는 것으로 정책의 실현성이 매우 낮다. 도시민들은 합리적으로 소비행태와 입지결정을 하는데 이를 무시하고 정책적으로 특정지역의 고밀개발을 추구하는 것은 비효율적인 것이다. 뉴어바니즘의 대표적인 정책인 역세권중심의 대중교통지향 개발은 실제에서 그 효율성이 달성되지 못하는 것으로 나타났다. 도시간의 무한경쟁 체제가 가속화하는 현실에서 도시재생의 대안적 기본방향은 개별도시와 도시민들의 자율성을 최대한 보장하는 것이다. 효율적인 도시재생을 위한 도시공간구조는 도시민의 선호도와 라이프스타일을 반영하는 전원도시와 다핵 분산도시이다. 도시의 재생과 변화과정에서 주민의 참여를 활성화시켜 도시민 스스로 방향과 모습을 만들어 가도록 하여야 한다. The purpose of this study is to seek alternatives for compact development which is a dominant theoretical basis of urban renewal. The direction of the new market-oriented approach is proposed by reviewing New Urbanism and assessing the policy. The results are as follows. The policy effects of New Urbanism are significantly less than expected. The reason is that the theoretical basis is super ideal which does not properly reflect the characteristics of city. Urban stocks such as a range of facilities and activities in urban space can not easily obtain the fundamental change. New Urbanism has been advocated regressive changes in the physical urban structure ignoring in urban residential preferences. The viable of New Urbanism policy is very low because the policy ignores the efficiency of urban land market system. The pursuit of high-density development in the specific areas that ignored the reasonable urban consumption patterns and the location decision will be ineffective. The transit-oriented development policy leading New Urbanism can not achieve its goal in practice. In system to accelerate competition among cities, the alternative basic direction of the urban regeneration is to ensure maximum autonomy of the individual cities and urban residents. For efficient regeneration of urban spatial structure is multi-core distributed city which is reflect lifestyle and preferences of the citizens. The participation of citizens in the process of urban regeneration should be enabled to create their own direction and shape.
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허종국(許宗國) 동북아시아문화학회 2016 동북아 문화연구 Vol.1 No.47
This paper tries to analyze the Effectiveness and limitations of China"s ethnic policy about Xinjiang ethnic problems by the economic approach. Recently, China is expected to overcome the domestic problems face challenges it is facing and it hopes to solve problems in Xinjiang, the so called ‘powder keg of China’. ‘One Belt, One Road’ strategy is to promote the strengthening of the economic ties of neighboring Central Asian countries, as well as to promote the economic development of Xinjiang. Also, it emphasizes the expansion of the multi-party security mechanism to ensure the safety in a ‘One Belt, One Road’ strategy. China believes that it could not only be able to resolve complaints through the inhabitants of Xinjiang"s economic development, but also strengthen the economic ties with the outside that could pose threat to China. Externally, China has tried to lead the economic development of Xinjiang, by west open policy in Xinjiang. The focus of the current stage of the strategy of the ‘One Belt, One Road’ is the building of infrastructure. China believes that it could strengthen the relationship and economic cooperation with relevant countries. In addition, internally, China is trying to lead the economic development of Xinjiang by the Second-stage western development strategy, urbanization strategy, domestic demand and consumption stimulus policies. China"s economic approach to solve Xinjiang problems can certainly be effective than in the past Coercive control method. However, when considering the complex international relations of the complexity and the surrounding situation with ethnic problems, Careful attention and care about social discontent in Xinjiang residents as well as ethnicity should be the priority consideration rather than rely too much on economic factors.
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