• Journal of the Korea Society of Computer and Information
• /
• v.19 no.12
• /
• pp.359-368
• /
• 2014

Process synchronization is one of the most difficult subject for students learning the Operating System courses. It is due to the fact that concurrent process environment, where many events occur at the same time, is difficult to understand for ordinary human who thinks only one thing at a time. Classical synchronization examples like the Bounded buffer problem or the Dining philosopher problem fail to hook attention and interest from lower grade students who just begin to study the Operating System courses in college because these examples are either too technical or too unrealistic. In this paper we propose another synchronization example named the Bank account problem as an alternative to the classical ones. Bank account problem is proved to succeed getting high interest and understanding from the student as it is easy and realistic, and almost every student has the experience using bank account in real life. Various synchronization subjects including controlling the execution sequence of each process, incorrect result due to the race conditions, use of semaphores, deadlock, and monitor are considered to apply them to the Bank account problem.

• Korean Journal of Construction Engineering and Management
• /
• v.17 no.1
• /
• pp.3-9
• /
• 2016

This study proposes a approximate cost estimation system based on Excel with VBA using weighted CBR(Case Based Reasoning). One characteristic of this system is that it generates the sheet automatically as many as the number of similar case and new estimation when it performs a case learning and a new estimate and cell formula is automatically entered into each sheet. User can be free to compose a combination of attribute factors because they can select up to ten attribute factors. This paper presents an applicability of estimation model for estimating the soil remediation cost when it use a landfarming method. When compared to a estimation model by using average unit cost and optimum multiple regression, this model shows a better result. This study was aimed at landfarming method, but it is expected that a cost estimation model using CBR will be more likely to apply in soil remediation technologies which various remediation technologies and pollutant species exist.

• Journal of the Korea Computer Industry Society
• /
• v.3 no.2
• /
• pp.125-140
• /
• 2002

As the society turns into one based on knowledge, there has been the general project of education informalization carried out. In this respect, the Seventh Common and Basic National Curriculum has adopted information and communication education which implies a broader meaning than just computer education. It also planned to make it mandatory to allocate one hour of computer class a week at the Int and second grade course and higher grades beginning at 2001, as well as to increase the initial one hour gradually by the year coming. In addition to the one hour of mandatory computer class a week, it advises teachers to use computer so that it can account for at least 10% of teaching-learning process in ten subjects per each grade which takes the Seventh Common and Basic National Curriculum. This study intended to learn about computer education curriculum at school and information and communication technology education found in the Seventh Common and Basic National Curriculum(1st∼10th grade) and to examine if they have a consistency for each grade. In addition to that, investigated the actual state of school by checking students' ability to operate computer and teachers' opinion through questionnaire survey.

• Journal of Educational Research in Mathematics
• /
• v.24 no.2
• /
• pp.103-124
• /
• 2014

The process of analogical reasoning can be conventionally summarized in five steps : Representation, Access, Mapping, Adaptation, Learning. The purpose of this study is to develop more detailed model for reason of analogies considering the distinct characteristics of the mathematical education based on the process of analogical reasoning which is already established. Ultimately, This model is designed to facilitate students to use analogical reasoning more productively. The process of developing model is divided into three steps. The frist step is to draft a hypothetical model by looking into historical example of Leonhard Euler(1707-1783), who was the great mathematician of any age and discovered mathematical knowledge through analogical reasoning. The second step is to modify and complement the model to reflect the characteristics of students' thinking response that proves and links analogically between the law of cosines and the Pythagorean theorem. The third and final step is to draw pedagogical implications from the analysis of the result of an experiment.

• Journal of Science Education
• /
• v.34 no.1
• /
• pp.105-112
• /
• 2010

The purpose of this research was to investigate relations between prior knowledge and primary grade science brilliant intellect's observation and inquiry. The subjects were selected 'Spider and cobweb' that self-regulation quest is available. Subjects were divided into two groups with one group having no prior knowledge about research subject. Compared observation method question type and level that appear between subject achievement to group. Target learning group are 5 ~ 6 school year 17 people for national university for the gifted center of local middle city. Researcher collected and analyzed data using summer vacation concentration education period. Source collection subject's research recording paper, subject's voice recording device, interview data etc. A data analysis tool took advantage of observation method that is studied in existing, question type, question level. Research was able to conclude : First, observation of prior knowledge happened than mass of students who many mass of students are few relatively vigorously. Second, primary grade science brilliant intellect students used more mainly manufacturing observation than simplicity observation that use senses regardless of relative quantity of prior knowledge. Third, prior knowledge expressed variety when many mass of students observe operation relatively.

• Journal of Educational Research in Mathematics
• /
• v.13 no.3
• /
• pp.247-265
• /
• 2003

The purpose of this study is to analyze the essence of ratio concept from educational viewpoint. For this purpose, it was tried to examine contents and organizations of the recent teaching of ratio concept in elementary school text of Korea from ‘Syllabus Period’ to ‘the 7th Curriculum Period’ In these text most ratio problems were numerically and algorithmically approached. So the Wiskobas programme was introduced, in which the focal point was not on mathematics as a closed system but on the activity, on the process of mathematization and the subject ‘ratio’ was assigned an important place. There are some educational implications of this study which needs to be mentioned. First, the programme for developing proportional reasoning should be introduced early Many students have a substantial amount of prior knowledge of proportional reasoning. Second, conventional symbol and algorithmic method should be introduced after students have had the opportunity to go through many experiences in intuitive and conceptual way. Third, context problems and real-life situations should be required both to constitute and to apply ratio concept. While working on contort problems the students can develop proportional reasoning and understanding. Fourth, In order to assist student's learning process of ratio concept, visual models have to recommend to use.

• Journal of Internet Computing and Services
• /
• v.19 no.3
• /
• pp.15-23
• /
• 2018

A code reuse attack is an attack technique that can execute arbitrary code without injecting code directly into the stack by combining executable code fragments existing in program memory and executing them continuously. ROP(Return-Oriented Programming) attack is typical type of code reuse attack and serveral defense techniques have been proposed to deal with this. However, since existing methods use Rule-based method to detect attacks based on specific rules, there is a limitation that ROP attacks that do not correspond to previously defined rules can not be detected. In this paper, we introduce a method to detect ROP attack by learning command pattern used in ROP attack code using RNN(Recurrent Neural Network). We also show that the proposed method effectively detects ROP attacks by measuring False Positive Ratio, False Negative Ratio, and Accuracy for normal code and ROP attack code discrimination.

• Journal of the Korea Society of Computer and Information
• /
• v.15 no.2
• /
• pp.27-34
• /
• 2010

Recently, lots of internet service companies provide on-line health diagnosis systems. But general persons not having expert knowledge are difficult to use, because most of the health diagnosis systems present prescriptions or dietetic treatments for diseases based on western medicine. In this paper, a self health diagnosis system of oriental medicine coinciding with physical characteristics of Korean using fuzzy ART algorithm, is proposed. In the proposed system, three high rank of diseases having high similarity values are derived by comparing symptoms presented by a user with learned symptoms of specific diseases based on treatment records using neural networks. And also the proposed system shows overall symptoms and folk remedies for the three high rank of diseases. Database on diseases and symptoms is built by several oriental medicine books and then verified by a medical specialist of oriental medicine. The proposed self health diagnosis system of oriental medicine showed better performance than conventional health diagnosis systems by means of learning diseases and symptoms using treatment records.

• Journal of Digital Contents Society
• /
• v.15 no.6
• /
• pp.737-743
• /
• 2014

For single image super resolution (SR), interpolation based and example based algorithms are extensively used. The interpolation algorithms have the strength of theoretical simplicity. However, those algorithms are tending to produce high resolution images with jagged edges, because they are not able to use more priori information. Example based algorithms have been studied in the past few years. For example based SR, the nearest neighbor based algorithms are extensively considered. Among them, neighbor embedding (NE) has been inspired by manifold learning method, particularly locally linear embedding. However, the sizes of local training sets are always too small. So, NE algorithm is weak in the performance of the visuality and quantitative measure by the poor generalization of nearest neighbor estimation. An improved NE algorithm with Support Vector Regression (SVR) was proposed to solve this problem. Given a low resolution image, the pixel values in its high resolution version are estimated by the improved NE. Comparing with bicubic and NE, the improvements of 1.25 dB and 2.33 dB are achieved in PSNR. Experimental results show that proposed method is quantitatively and visually more effective than prior works using bicubic interpolation and NE.

• The Journal of Korean Association of Computer Education
• /
• v.12 no.3
• /
• pp.23-30
• /
• 2009

Most previous studies on programming learning effect is limited to measuring the enhancement degree of creativity and problem solving ability. This study is to find out indexes related to programming ability, other than creativity and problem solving ability by the specialty-aptitude test(SAT) in the elementary school. For this, 4th grade elementary students took LOGO programming class and the achievement test. As a result, among 4 regions of SAT, all five indexes of intellectual ability is highly related to programming ability, indicating that students with high intelligence rather than creativity have higher programming ability and that for our experiment settings the reverse of the previous result stating that programming education positively affects the development of problem solving ability and creativity does not hold.