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    • Quantification of volumetric absorption for absorbable implant using micro-CT

      강성원 서울대학교 대학원 2012 국내석사

      RANK : 247631

      Introduction: The purpose of the study was to quantify the VA (volumetric absorption) from the result of osseointegration in micro-CT analysis. We have developed a new method to evaluate the osseointegration and absorption of the absorbable implant using micro-CT images. The measurement was correlated with the histomorphometric analysis. Methods: For the procedure, mandibular 2 and 4 premolars were extracted bilaterally from seven experimental dogs (beagle dog), and installed two PLA-TCP 30% implants on each side. For close examination, the implants with its surrounding tissue were dissected to safely remove implants from the figures in sequence of 4 week, 8 week, and 12 weeks lapse since the installation. Seven implants were damaged and excluded and total 21 implants samples were used for the analysis. From the Micro- CT scan images, the confidence connected segmentation, connected threshold segmentation, morphology operation and labeling algorithm were applied, and volumetric analysis was performed between bone and implant to measure the VBIC (Volumetric Bone-Implant contact) and VA(Volumetric Absorption). The implant slices were prepared by dissecting the center area of the sample tissues in axial direction for histomorphometric analysis of BIC (Bone-Implant contact) and BA (Bone Area). Results: As a result, the mean of VA and VBIC increased significantly with an increase in the healing period (p<.01 ANOVA, p<0.05 the turkey's multiple comparison test) The BA and the BIC did increase over the implant installation time period, but the difference of mean did not show significant difference. After analyzing the correlation between the VBIC and the VA based on Micro-CT analysis (which showed significant difference previously), it showed significant difference in correlation 0.463. Conclusions: A compare of two different methods for quantify of osseointegration, histomorphometric analysis was limited to the absorbable implant analysis because the absorbable implant change in the size. In contrast, VA of absorbable implant showed significant correlation with VBIC, and it has provided a new parameter for osseointegration evaluation. Therefore, quantification of VA is required to evaluate osseointegrationun of an absorbable implant besides the other existing methods.

    • 韓國企業의 對中國 投資現況과 增進方案에 관한 硏究

      강성원 朝鮮大學校 中小企業大學院 1997 국내석사

      RANK : 247631

      The purpose of this thesis is to provide Korean enterprises with informations and data on China by the theoretical analysis about investment environment, findings and problems with the suggestion of promotion plan to China. The cooperation between Korea and China has been increased because the two nations have incentives to cooperate with each other in terms of economic and political aspects. After following the modernization policy which emphasizes the principle of practicalism and open-door policy, China transformed its social planned economy into the free market economy. That transformation policy resulted in the reformation of trade management system which has the characteristics of state-owned organization in China. And the basic goal of such trade management system was decentralization of foreign trade management and establishment for the promotion of foreign trade and foreign direct investment to China. That goal affected the system of foreign trade management which was over-controlled by the headquarter in China and decentralized tbat system to and into the lower part, provinces, cities, self-governed cities, and enterprises with the power of autonomy and right. China has continued to open and reform the social system since 1987 and imp roved the investment environment and made effort to induce the foreign capital-intensive high technology with the entry of foreign general companies especially for the Korean enterprises' investment. Rapid changes of internal management environment--low labour productivity, high wage level, frequent labour strike, domestic high interest rate, also with the changes of external environment--developed countries' trade protection and fair trade policy have forced to transfer Korean domestic production base to abroad. Deplomatic establishment between China and Korea on August 1992 made China as the priority country to investment by Korea and Korean enterprises. China has designated many economic special districts for the open policy abroad and utilized this districts for the inducement of high technology and management technique. As a result of that policy, she greatly induced the foreign capital and technology for the establishment of capitalism. But until now, China has a lot of problems such as lack of infrastructure, short supply of low materials and equipments for manufacturing, complex administration system on investment and small inland market. Even with a lot of problems, under the WTO system China will be the great potential market to the rest of the world. According to the result of this thesis , investment promotion plan for Korean enterprises to China are as follows: First, Korean enterprises should have the target for China's domestic market. For that purpose, product differentiation by the district partition should be recommended. Second, Korean enterprises should use the method of joint venture and diversification by the type of industry. That method includes the cooperation between general and medium company. Third, Korean enterprises should increase investment to the North-East three districts because those districts will become central districts for the economic cooperation. Fourth, Korean enterprises should try to find a solution to the entry plan for the construction of market because potential construction demand in China will be increased greatly. Fifth, Korean enterprises should establish the agreement between countries for the investment of the technology intensive industry such as automobile industries which will induce the greastest demand in the China market.

    • 원화가치의 고(저)평가와 자본수지·경상수지와의 동태적 상호작용 분석

      강성원 성균관대학교 2005 국내석사

      RANK : 247631

      For countries with a high dependency on foreign trade like Korea, the exchange rate affects the general economy. Therefore this paper attempts to find the fair exchange rate in Korea in each period. And then this paper presents how the difference between the fair exchange rate and the nominal exchange rate affects capital balances and current accounts and vice versa, using the VAR models and VECM. According to the regression equations, the impulse response functions analysis and the variance decompositions analysis by VAR models and VECM, it is revealed that positive shocks to the degree of the over(under)valued exchange rate lead to promptly sharp increases in current accounts and promptly sharp decreases in capital balances. And it is also revealed that the fluctuations of the exchange rate affect the fluctuations of current accounts and the fluctuations of capital balances comparatively deeply, but the fluctuations of the exchange rate are hardly affected by the fluctuations of current accounts and the fluctuations of capital balances.

    • n분 도시 계획을 위한 생활SOC별 접근성 분석 : 창원시, 의령군 사례

      강성원 경상국립대학교 대학원 2025 국내석사

      RANK : 247631

      The concept of the "n-minute city" has garnered international attention as part of time-based urban planning. However, research on this topic remains limited, particularly in South Korea, where accessibility-focused studies are still insufficient. Moreover, significant differences in urbanization levels between regions highlight the contrasting conditions: Changwon City, which has undergone rapid industrialization and urbanization, stands in stark contrast to Uiryeong County, a predominantly rural area with lower urbanization. By comparing these two distinctly different regions, this study aims to illustrate how varying urbanization levels impact the feasibility of implementing an n-minute city. This research targets Changwon City and Uiryeong County, with Changwon further divided into urban and non-urban areas for analysis. The study focuses on evaluating accessibility to eight types of living SOC (Social Overhead Capital) facilities. The primary objective is to propose a strategic framework for building n-minute cities in these areas. Data was analyzed on a 100x100m grid scale, capturing population density, the distribution of SOC facilities, and constructing road network data. Accessibility to facilities was measured using network analysis in QGIS, while population concentration was assessed by applying the concept of Densely Inhabited Districts (DID). This approach enabled the study to prioritize areas with higher population density rather than uniformly analyzing the entire grid, ensuring a more practical basis for urban planning. The analysis of DID accessibility revealed that in Changwon’s urban areas, the average access time per grid cell was 13.00 minutes, while the population-weighted average was 12.00 minutes per person. Accessibility to libraries, sports facilities, and parking lots was notably lower compared to other facilities. In non-urban Changwon, the average access time per grid cell was 21.64 minutes, with a population-weighted average of 18.86 minutes per person. Similar to the urban areas, accessibility to libraries, sports facilities, and parking lots often exceeded 30 minutes on foot. In Uiryeong County, the average access time per grid cell was 18.88 minutes, while the population-weighted average was 16.58 minutes per person, with basic medical facilities, sports facilities, and parks showing relatively poor accessibility. Overall, Changwon’s urban areas demonstrated better accessibility to elementary schools and basic medical facilities, while non-urban and suburban areas had relatively better access to elderly welfare facilities. In contrast, Uiryeong County exhibited lower accessibility to key facilities like sports centers and parks. Additionally, the significant variations in access times across grid cells in non-urban Changwon and Uiryeong County underscore the need for targeted interventions. Given South Korea’s ongoing population decline, achieving an n-minute city requires a re-evaluation of current location and layout strategies, tailored to the specific needs of each region. Furthermore, indiscriminately adding new SOC facilities are impractical. Instead, adopting urban restructuring strategies, such as compact city models that emphasize land-use optimization, is crucial for creating sustainable urban environments.

    • 가압부상공정을 이용한 dodecane 및 퇴적준설물 내 고형물과 영양물질 제거에 관한 연구

      강성원 中央大學校 大學院 2002 국내석사

      RANK : 247631

      본 연구에서는 가압부상공정(DAF)을 이용한 dodecane 및 퇴적준설물 내 고형물과 영양물질 제거에 관하여 알아보았으며, 연구의 결과를 요약하면 다음과 같다. 1. 가압부상공정을 이용한 준설퇴적물 내 고형물과 영양물질 제거에 관하여 실험을 수행한 결과, 가압수주입비 30%에서 고형물(TS)농도제거효율이 가장 좋았다. 고형물농도제거효율은 가압수주입비 30%>40%>20% 순으로 나타났다. 그러나 T-N, T-P의 제거효과는 거의 없었다. 부상속도는 평균 15.87 m/hr이며, Stokes 법칙에 적용한 결과 기포크기는 약 80?110 ㎛로 나타났다. 본 연구에서는 가압수주입비 30%와 가압탱크압력 4.5 kg/cm2에서 고형물(TS)에 대해 가장 높은 처리효율을 나타내었다. 2. 인공적으로 제조한 dodecane 유화수로부터 dodecane을 분리제거하기 위해 ① 유화수의 안정화를 증가시키는 계면활성제(Tween 80, SDS, Sodium Oleate) 존재 시, ② 유화수의 pH값의 변화, ③ 응집을 위해 첨가된 화학물질의 종류와 농도 : 고분자응집제(양, 음이온 유기응집제)와 Ferric Chloride(무기 응집제), ④ 반송비 와 같은 부상효율에 대한 영향인자들을 응집과 가압부상실험을 통하여 조사하였으며, 결과 분석을 위해 Zeta-Potential도 측정하였다. 계면활성제의 첨가는 처리효율에 대해 저해요소로 작용하였다. 그러나 고분자응집제, Ferric Chloride의 첨가에 의한 응집과 DAF후속처리는 매우 효과적이었다. 초기농도 1000 mg/L, 초기탁도 90 NTU 전후의 유화수에 대해 dodecane제거율에 대한 최적 처리조건은 반송비 30%, 계면활성제 무첨가, Ferric Chloride 60 mg/L 주입으로써 94.73%의 제거율을 나타내었다.

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