• Education of Primary School Mathematics
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• v.1 no.1
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• pp.73-83
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• 1997

옛날부터 계산을 잘하는 것이 수학적으로 우수하다고 생각해왔으며, 거의 1900년까지도 교육을 받았다는 것은 계산할 수 있다는 것을 의미하였다. 초등학교의 대부분의 시간은 덧셈, 뺄셈, 곱셈, 나눗셈을 배우는 데 투입되었다. 현재에도 초등학교의 교육과정은 기본 교육에 중점을 두어 3R's(reading, writing, arithmetic)을 강조하고 있으며, 많은 교사나 학부모들은 계산능력에 대해 지대한 관심을 가지고 있다. 1970년대의 '새 수학' 운동으로 계산력이 약화되었다는 비난이 쏟아지자 '기본에 충실하자(Back to basic)'는 운동으로 계산이 강화되기도 하였다.(중략)

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.37 no.3
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• pp.88-97
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• 2000

This paper presents motion estimation method using region segmentation information Motion estimation which is very difficult to be implemented only by software because of intensive computation cost, is implemented by special-purpose hardware in real-time applications In this paper, we propose region based motion estimation algorithm which can reduce the computation cost by using region segmentation information and setting the variable search window compared with FSMA algorithm Secondly, another proposed algorithm is to segment semantic region like face for selective coding and transfer of semantic region using segmented region information This work alms to improving the subjective quality of skin color region or face region m the picture that has slow motion and IS mainly composed of one or two speakers of video conference and video telephony applications.

• Journal of Internet Computing and Services
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• v.9 no.3
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• pp.43-50
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• 2008

Authenticated Encryption scheme in RFID system is the important issue for ID security. But, implementing authenticated Encryption scheme in RFID systems is not an easy proposition and systems are often delivered for reasons of complexity, limited resources, or implementation, fail to deliver required levels of security. RFID system is so frequently limited by memory, performance (or required number of gates) and by power drain, that lower levels of security are installed than required to protect the information. In this paper, we design a new authenticated encryption scheme based on the EC(Elliptic Curve)'s x-coordinates and scalar operation. Our scheme will be offers enhanced security feature in RFID system with respect to user privacy against illegal attack allowing a ECC point addition and doubling operation.

• The KIPS Transactions:PartD
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• v.11D no.3
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• pp.533-544
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• 2004

Reports have a significant meaning in time-constrained large transaction environments, such as airplane control systems or wargame simulations. This is due to the necessity of generating reports within a given time limit without restraining the operation performance of large transaction environments. In order to generate reports in large transaction environments while satisfying time-constrained requirements, this paper proposes a model which combines the incremental operation mechanism and materialized view mechanism using triggers and stored procedures. Further, the implementation and evaluation of the proposed model provides the Identification of the characteristics of the proposed model.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.14 no.3
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• pp.137-144
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• 2004

3GPP(3rd Generation Project Partnership)-WLAN(Wireless Local Area Network) interworking refers to the utilization of resources and access to services within the 3GPP system by the WLAN UE(User Equipment) and user respectively. The intent of 3GPP-WLAN Interworking is to extend 3GPP services and functionality to the WALN access environment. We propose an efficient mechanism for the setup of UE-initiated tunnels in 3GPP-WLAN interworking. The proposed mechanism is based on a secret key which is pre-distributed in the process of authentication and key agreement between UE and 3GPP AAA(Authentication, Authorization Accounting) server. Therefore it can avoid modular exponentiation and public key signature which need a large amount of computation in UE. Also the proposed scheme provides mutual authentication and session key establishment between UE and PDGW(Packet Data Gateway).

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.05a
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• pp.359-360
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• 2021

The pixel-based processing of an image refers to a process of converting a value of one pixel only depending on the value of the current pixel, regardless of the value of another pixel. Pixel-based processing is used as the most basic operation in many fields such as image conversion, image enhancement, and image synthesis. There are processing methods such as arithmetic operation, histogram smoothing, and contrast stretching. In this paper, in order to clearly distinguish the tidal flat region from the tidal flat image of the west coast taken with a drone, we seek a method to find an efficient outline using pixel-based processing in the boundary detection part of the pre-processing process.

• The Journal of Information Technology and Database
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• v.4 no.1
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• pp.31-50
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• 1997

객체지향 데이터베이스 시스템에서 시간지원 데이터베이스를 다룰 때 발생하는 중요한 문제는 관계 의미에 따라 시간과 속성을 결합하는 방법에 있다. 관계형 모델처럼 속성 버전화에 대한 기존의 연구 결과는 시간지원 객체지향 모델에 적용할 수 없다. 이것은 객체지향 모델이 복합 객체를 구성하기 위해서 기존의 모델보다 더욱 강력한 구성자들을 제공하기 때문이다. 그래서 이 논문은 객체지향 데이터베이스에 시간 개념을 통합하기 위한 형식적 접근방법을 제안한다. 이 논문의 목적은 객체 사이에 관계하는 일반화, 집단화와 연관화에 따라 시간지원 객체지향 데이터베이스 표현을 연구하는 것이다. 이 논문은 시간지원 객체지향 모델에서 속성 버전화의 개념을 정의하고, 객체 사이에 존재하는 관계에 대해서 시간을 표현하는 것에 중점을 둔다. 또한 관계 의미에 대한 제약조건을 규정하고, 표현 기준에 기반하여 검토한다. 이 논문은 객체지향 데이터 모델을 형식화함으로써 대수 연산자의 설계시 강력한 연산 기능을 제공할 뿐만 아니라 모듈의 재사용성을 제공할 수 있다.

• Journal of Science Education
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• v.44 no.3
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• pp.331-344
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• 2020

This study aims to find meaningful implications for the development of Korean elementary school math education courses and textbooks by comparing and analyzing the number and arithmetic areas of Korean and Canadian math textbooks in fifth and sixth grades. To this end, the textbook composition system of Korean and Canadian elementary schools was compared and analyzed, and the number and timing of introduction of math textbooks and math textbooks by grade, and the number in fifth and sixth grade and the learning contents of math textbooks were compared and analyzed. The following conclusions were obtained from this study: First, it is necessary to organize a textbook that can solve the problem in an integrated way by introducing the learned mathematical concepts and computations naturally in the context of problems closely related to real life, regardless of the type of private calculation or mathematics area. Second, it is necessary to organize questions using materials such as real photography and mathematics, science, technology, engineering, art, etc. and to organize textbooks that make people feel the necessity and usefulness of mathematics. Third, sufficient learning of the principles of mathematics through the use of various actual teaching aids and mathematical models, and the construction of textbooks focusing on problem-solving strategies using engineering tools are needed. Fourth, in-depth discussions are needed on the timing of learning guidance for fractions and minority learning or how to organize and develop learning content.

• Journal of KIISE:Computing Practices and Letters
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• v.13 no.1
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• pp.35-45
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• 2007

The log data collected from mobile devices contains diverse meaningful and practical personal information. However, this information is usually ignored because of its limitation of memory capacity, computation power and analysis. We propose a novel method that detects landmarks of meaningful information for users by analyzing the log data in distributed modules to overcome the problems of mobile environment. The proposed method adopts Bayesian probabilistic approach to enhance the inference accuracy under the uncertain environments. The new cooperative modularization technique divides Bayesian network into modules to compute efficiently with limited resources. Experiments with artificial data and real data indicate that the result with artificial data is amount to about 84% precision rate and about 76% recall rate, and that including partial matching with real data is about 89% hitting rate.

• Journal of KIISE:Databases
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• v.27 no.2
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• pp.165-174
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• 2000

Recent researches about range queries in OLAP are only concerned with applying an aggregation operator over a certain region. However, data analysts in real world need not only the simple range query pattern but also an extended range query pattern that finds ranges which satisfy a special condition specified by using several aggregation operators. In this work, we define the general form of the extended range query and propose an efficient processing method for the 'MAX -of-SUM' query, which is the representative form of the extended range query pattern. The MAX-of-SUM query finds the range which has the maximum range sum value in data cube where the size of the range is given. The proposed query processing method is based on the prediction of the scope of the range sum values. That is, the search space on the query processing can be reduced by using the result of the prediction, and hence, the query response time is also reduced.