• KIPS Transactions on Software and Data Engineering
• /
• v.2 no.12
• /
• pp.855-864
• /
• 2013

Decision tree classification is one of the important problems in data mining fields and data minings have been important tasks in the fields of large database technologies. Therefore the coupling efforts of data mining systems and database systems have led the developments of database primitives supporting data mining functions such as decision tree classification. These primitives consist of the special database operations which support the SQL implementation of decision tree classification algorithms. These primitives have become the consisting modules of database systems for the implementations of the specific algorithms. There are two aspects in the developments of database primitives which support the data mining functions. The first is the identification of database common primitives which support data mining functions by analysis. The other is the provision of the extended mechanism for the implementations of these primitives as an interface of database systems. In data mining, some primitives want be stored in DBMS is one of the difficult problems. In this paper, to solve of the problem, we describe the database primitives which construct and apply the optimized decision tree classifiers. Then we identify the useful operations for various classification algorithms and discuss the implementations of these primitives on the commercial DBMS. We implement these primitives on the commercial DBMS and present experimental results demonstrating the performance comparisons.

• Clean Technology
• /
• v.18 no.1
• /
• pp.57-62
• /
• 2012

Aqueous poly (vinyl alcohol) (PVA) solution was modified by using hydrophobic vinyltriethoxysilane (VTEOS) and then adding different amounts of poly (acrylic acid) (PAA) to the resulting solution. Thermal and mechanical properties, contact angle, water vapor transmission rate (MVTR) and oxygen gas transmission rate ($O_2TR$) of the film samples fabricated by these solutions were investigated. The glass transition temperature (Tg) of the VTEOS-modified films was sightly increased and the value remained unchanged according to the amount of PAA. The tensile strength of the VTEOS-modified films was found to be 9.48~10.72 $kg/mm^2$ which showed no significant difference compared with that of PVA. The film prepared with VTEOS-modified PVA/PAA (= 90/10), of which the swelling and solubility were measured to be 198% and 0%, respectively, showed improved water-resistance. The MVTR and $O_2TR$ for the PET film (thickness 50 ${\mu}m$) coated with VTEOS-modified PVA/PAA (= 90/10) film (thickness 2.5 ${\mu}m$) were measured to be 11.04 $g/m^2/day$ and 3.1 $cc/m^2/day$, respectively.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.20 no.10
• /
• pp.187-194
• /
• 2019

The purpose of this study was to review the Gentrification and Development Index in terms of domestic and foreign gentrification. Based on the important indicators of the Gentrification index through previous research, the four evaluation areas were divided into structure and subject, production and consumption, supply and demand, and capital and culture. Looking at the importance of each area, the production and consumption aspects were highest as the important index of the occurrence of gentrification, followed in order by the supply and demand, the structure and subject, and the capital and culture order. From the detailed factors, the report revealed the changes in sales to structure and subject matter, increases in franchises to production and consumption, rises in rent to supply and demand, and transient population to capital and culture to be important items. In addition, an analysis of the gentrification occurrence indicators in urban regeneration project areas revealed high weight in terms of production and consumption, supply, and demand, including the increased franchises, one-person start-ups, higher rents and higher real estate values. In other words, the occurrence of gentrification in urban regeneration areas produces the largest portion of the increases in franchises and rent. Therefore, step-by-step measures are needed through monitoring.

• 대한공업교육학회지
• /
• v.31 no.2
• /
• pp.203-232
• /
• 2006

The purposes of this study are to examine the effects of learning, which was applied TRIZ's 40 inventive principles, on the improvement of learners' creativity and to offer basic information that would be necessary to study on Inventive Education in Technology Education. In order to achieve the purposes, objects were divided into two groups, experiment group(74 students) and control group(67 students), who were from B Middle school in Daejeon. Creativity Self-Assessment and Student Inventive Rating Scale were used as tools for research so that we could find the homogeneity in two groups. An applied design method was nonequivalent control group pretest-posttest design. This study was performed for 2 hours on the 1st and the 3rd Saturday in every month from the 3rd week of March, 2006 to the 3rd of July of 2006, and total researching period was 9 weeks. In that time, the students were required to learn 40 inventive principles. The results from this study are as below. (1) Applying TRIZ's 40 inventive principles had a positive effect on students' CQ(creative quotient), as influencing on the subordinate factors of creativity, such as, originality, germinal, trasformational, value, attraction, expressive power and organic systemicity. However it didn't have any effect on adequateness, properness, merit, complex and elegance. (2) Applying TRIZ's 40 inventive principles had a significant effect neither on CQ by sex, nor on the subordinate factors of creativity, except for originality and expressive power. Based on the results of the experiment, below suggestions were made to promote the application of TRIZ's 40 inventive principles to Technology Education. (1) Although this study was performed by using development activities, it is necessary to study more systemically to apply 40 inventive principles to regular subject in Technology Education. (2) As creativity was very important in Technology Education, there should be studies on the various types of inventive principles and techniques for Inventive Education in Technology Education.

• Proceedings of the Korean Information Science Society Conference
• /
• 2006.06d
• /
• pp.16-18
• /
• 2006

RFID는 RF신호를 이용하여 물체에 부착된 태그(tag)를 읽어 물체를 식별하는 비 접촉 인식 기술이다. RFID 리더의 식별영역에 여러 개의 태그가 있는 경우 이들 사이의 충돌(collision)이 발생되기 때문에 이들을 식별할 수 있는 메커니즘이 있어야 한다. 본 논문에서는 먼저 기존에 제안된 트리 기반 메모래스 충돌방지 알고리즘들을 살펴보고, 본 논문에서 제안하는 향상된 쿼리 기반 충돌 알고리즘(AQT : Advanced Query Tree based Collision Algorithm)을 소개한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 1999.11b
• /
• pp.27-32
• /
• 1999

본 논문에서는 정확한 비트 제어가 가능한 동영상 통신을 위한 새로운 영상 부호화 방법을 제안한다. 기존의 표준 부호화기와 호환성을 최대한 유지하기 위해 MC/DCT 하이브리드 부호화 구조에 의거한 순차 전송의 임베이드 트리 구조의 부호화 방법을 기술한다. 제안 방법의 유효성을 검증하기 위해 표준 동영상에 대한 컴퓨터 모의 실험 결과 제안방법은 기존의 부호화 방법에 비해 비트 제어가 용이하고 부호화 성능이 개선됨을 확인했다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2003.05a
• /
• pp.602-605
• /
• 2003

최근, 컴포넌트 기술의 발전에 따라 웹 기반 교육 시스템에서도 이를 응용하여 다양한 교육 컨텐츠의 제공 및 활용하려는 연구가 진행되고 있다. 또한, EJB는 웹 기반 컴포넌트 모델로서 웹 기반응용 시스템부분에서 많은 관심을 받고 있다 그러나, 컴포넌트 기반 웹-코스웨어는 이용 가능한 상용 컴포넌트와 인식부족으로 아직까지 실용화되지 못하고 있는 실정이며 분석에 관한 정형화도 이루어지지 않고 있다. 따라서, 본 연구에서는 EJB 컴포넌트를 이용한 웹 코스웨어를 분석 및 구현을 하였다. 컴포넌트들 사이의 메시지 흐름에 대한 정형적인 명세 분석을 위하여 페트리 넷을 이용하였으며, 각 기능에 따라 무상태 세션 빈의 형식으로 EJB 시스템을 구현하였다.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
• /
• 2007.06a
• /
• pp.259-262
• /
• 2007

현재의 전자제어 차량 정비에 있어서 각종 센서 및 엑츄에이터의 전압파형을 측정, 분석하여 원인을 진단하는 사례가 일반화 되어 가고 있다. 이러한 추세에 맞추어, 자동차 정비 실습 교육시 전압 파형 측정을 위하여 학생들이 직접 각 센서 및 엑츄에이터 커넥터에 탐침을 연결, 측정하고 있으며 이 과정에서 커넥터의 전선피복이 손상되는 사례가 빈번히 일어나고 있다. 본 논문에서는 트리즈의 6단계 창의성 기법을 적용하여 전선피복이 손상되는 원인을 찾아내고 혁신적인 해결책을 제시하였다.

• Proceedings of the Korea Database Society Conference
• /
• 2000.11a
• /
• pp.95-100
• /
• 2000

사실 표준 XQL(XML Query Language) 기반의 문서 질의를 이용하여 XML 문서에 대한 구조 검색과 내용 검색을 위한 문서검색 시스템을 구성하였다. 즉 XML 문서를 파징하여 내용 및 구조 정보를 트리구조로 구성하고, 표준 XQL을 이용하여 트리 구조 정보에 질의함으로서 구조 및 내용 검색을 하도록 구현하였다. 이를 이용한 응용분야로는 향후 방대한 크기의 XML문서 검색과 문서 관리, 전자 상거래 등 다양한 분야에 활용될 수 있는 요소기술로서 기대된다.

• 축산식품과학과 산업
• /
• v.13 no.1
• /
• pp.31-43
• /
• 2024