http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김재홍 한국중세사학회 2016 한국중세사연구 Vol.0 No.46
Examined in this article are the iron-based agricultural utensils used in the Goryeo dynasty, in order to clarify their forms, shapes and locations at which they were found, and thus determine certain local variances as well as basic unity among them all. The purpose of such examination is to have a glimpse into the diverse nature of the Goryeo culture. What vividly shows us the characteristics of the Goryeo period’s iron-based agricultural utensils is a collection of items such as plowshare‧comb, weederplow and hoe. Plowshare & comb inherited forms and shapes from the Unified Shilla period’s plows, while weederplow and hoe were newly created and continued to be developed. Weederplow and hoe were adequate tools to be used in reclaiming mountain lands(山田) and mid-season weeding(中耕除草), and were essentially devices for the peasants to adapt to new conditions and circumstances. The new utensils continued to develop with the support of the state, as the government continued to distribute them to local regions. It was the government’s intention to promote and enhance agricultural production, and that determination brought a certain level of unity to the designs of the utensils. Local diversity in the Goryeo society can be seen from agricultural rituals designed to bury the utensils as well. During the Unified Shilla dynasty period, plowshare and comb were buried in caves during rituals, and it seems like those rituals were overseen by the local prefects as items that seemingly belonged to the local governmental offices were excavated alongside them. In the Goryeo period, weederplow and hoe were added to the rituals, and examples of putting large potteries, steamers, iron caldrons inside the caves increased later on. Every local region seemed to have run various agricultural rituals with the hyang’ri clerks at the helm. It led to local variances and diversity.
CERECⓇ system에서 사용하는 세라믹 소재로 가공된 CAD/CAM 전부도재관의 변연간격 비교분석
김재홍,김사학,김기백 대한치과기공학회 2016 대한치과기공학회지 Vol.38 No.3
Purpose: The purpose of this study is to evaluate the marginal gap of all-ceramic crowns fabricated by CERECⓇ in-office CAD/CAM system. Methods: The mandibular first molar was selected as the abutment for the experiments. Thirty working models were prepared. VITA Mark Ⅱ(VM) and VITA Enamic(VE), LAVA Ultimate(LU) blocks were milled using CEREC MCXL with CEREC 3D system to construct 10 crowns for each groups. To measure marginal gap, milled restorations were examined under digital microscope with scale under 160x magnifications. The results were statistically analyzed using the one-way ANOVA and Tukey’s HSD test(α=0.05). Results: There was no significant difference in the marginal gap regarding to ceramic materials(p>0.05). Conclusion: Single crowns fabricated using CEREC in-office CAD/CAM system provided clinically acceptable marginal gap. This confirmed that the type of ceramic material used does not determine the precision of fit of a prosthesis.
김재홍,배해영 한국공간정보학회 1993 한국공간정보학회지 Vol.1 No.1
최근 컴퓨터 기술의 발달로 단순한 문자, 숫자 등의 정보 표현에서 사용자가 보다 이해하기 쉽고 사용하기 쉬운 그래픽, 이미지 등의 공간 데이타에 대한 표현을 요구하고 있다. 지리 정보 시스템은 지도 형태의 데이타를 출력할 뿐만 아니라 지리 데이타(geographic data)의 저장, 검색, 조작 및 분석 등을 처리하는 데이타베이스 시스템으로 지리적 요소의 공간 데이타와 이와 관련된 속성 데이타를 처리하는 효율적인 시스템이다. 공간 데이타의 처리는 기존의 데이타베이스 관리 시스템으로 그 처리가 어렵고 효율적으로 저장 관리하지 못하므로 공간 데이타에 대한 효율적인 연산을 처리할 수 있는 새로운 데이타베이스 관리 시스템이 요구된다. 본 논문에서는 지리 정보시스템과 같은 방대한 공간 데이타를 효율적으로 저장관리하며, 사용자에게 빠른 접근을 위해 새로운 공간 색인 기법을 지원하는 확장된 거장 관리 시스템을 설계한다. Current computer technologies developing. our requirements are changing from simple alpha-numeric processing to graphic and image. spatial data processing which are easy for user to understand and use. Geographic information system is a kind of spatial database system that can not only print out the data in the form of maps but also manipulate. store. retrieve. and analyze the geographic data. It is efficient system that can process the spatial data which has a geographical feature and its relative attribute data. Conventional relational database management systems are not suitable for spatial data processing, so we need to design the spatial database mana-gement system which is suitable for efficient spatial data processing. In this paper we design the extended storage management system that supports the spatial index technique that allows user to access fast and store and manage the enormous spatial data efficiently like geographic information system.