• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2007년도 추계종합학술대회
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• pp.819-821
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• 2007

The explosive growth of the Internet brought serious problems to the Internet routing infrastructure. Especially scaling problems is recognized more seriously. The ever increasing user population, as well as multiple other factors including multi-homing, traffic engineering, and policy routing, have been driving the growth of Default Free Zone (DFZ) routing table size at an alarming rate. While it has been long recognized that the existing routing architecture may have serious scalability problems, effective solutions have yet to be identified, developed, and deployed. Recently, several attempts for finding the concrete problems are made. Especially the report of the routing and addressing workshop which the IAB (Internet Architecture Board) held on 2006 is described the problems of the current internet in detail. This document describes those problems and introduces the related activity to solve the problems.

• International Journal of Contents
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• 제6권1호
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• pp.12-19
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• 2010

In this paper, attendance in distance learning courses of a cyber university has been surveyed in an effort to verify the effectiveness of distance learning. Based on survey data from 4,749 distance learning participants, major attending place, major reasons for attending online class, fidelity to online classes, attending time per week, perceived educational effectiveness, perceived and relative seriousness of problems, and other variables have been evaluated. The results indicate that perceptional seriousness of the investigated problems is not statistically important. The findings indicate that, among operational problems, self willingness and cheating are the most remarkable. In contrast, the relative seriousness of traditionally recognized problems such as H/W availability and network speed among environmental problems is least remarkable. An analysis of demographic differences such as sex, employment, and school year in terms of seriousness of problems is also performed. The results reveal the existence of statistically significant differences according to sex, employment, and school year with regard to almost all elements of environment, actual current conditions, and seriousness of problems, with the exception of some elements such as attending place and perceived fidelity.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제23권2호
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• pp.175-196
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• 2009

본 연구는 수학교과의 수준별 교수-학습 자료의 이론적 뒷받침에 관련된 문헌연구로, Ziv의 교수학적 자료에 제시된 하수준과 중수준에 해당하는 교수-학습 자료들을 수학문제의 내적구조라는 관점에서 분석하여, 하수준 문제들의 특징들, 중수준 문제들의 특징들을 조사하였다.

• 가정과삶의질연구
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• 제19권6호
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• pp.67-76
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• 2001

The purpose of this study was to explore the consistency between rators(mother report & child self-report) of children's externalization and internalization behavior problems and to examine the effect of mother\`s depressive traits and child\`s negative emotionality on consistency between rators. Subjects were 434 children attending grades 4, 5, and 6 in Pusan and their mothers. Results of this study were as follows ; First, children reported significantly greater on behavior problems than their mothers and correlations between mother's and child's score on behavior problems was .20 (externalization behavior problems) or .27(internalization behavior problems). Second, mother's depressive traits influenced significantly the consistency between rators of externalization behavior problems. Third, child's negative emotionality influenced significantly the consistency between rators of externalization behavior problems.

• 대한산업공학회지
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• 제23권2호
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• pp.323-341
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• 1997

Traditionally, the Process Planning problems and the Scheduling problems have been considered as independent ones. However, we can take much advantages by solving the two problems simultaneously. In this paper, we deal with the enlarged problem that takes into account both the process planning and the scheduling problems. And we present a solution algorithm for the problem assuming that the given process plan data is represented by AND/OR graph. A mathematical model(mixed ILP model) whose objective is the minimization of the makespan, is formulated. We found that we can get the optimal solutions of the small-size problems within reasonable time limits, but not the large-size problems. So we devised an algorithm based on the decomposition strategy to solve the large-scale problems (realistic problems) within practical time limits.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 추계학술대회
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• pp.203-204
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• 2018

This research was conducted to identify adolescent problems in internet articles. This research defines adolescent problems as diverse issues related to adolescents and examine how it was dealt in the media to find out how different categories and the aspect of adolescent problems are changing by time. The result of the research was that in 1990's, education policy and family were mainly dealt with when it came to adolescent problems. As the era is changing, adolescent problems were far diversified compared to the past, and each problems are dealt with similar importance. This research is significant in that it does not only examine the social trend adolescent problems but also expand the range of adolescent counselling and utilizes quantitative analysis in considering diversity to provide new information.

• Journal of applied mathematics & informatics
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• 제23권1_2호
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• pp.141-152
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• 2007

In this paper a numerical method is presented to solve singularly perturbed two points boundary value problems for second order ordinary differential equations consisting a discontinuous source term. First, in this method, an asymptotic expansion approximation of the solution of the boundary value problem is constructed using the basic ideas of a well known perturbation method WKB. Then some initial value problems and terminal value problems are constructed such that their solutions are the terms of this asymptotic expansion. These initial value problems are happened to be singularly perturbed problems and therefore fitted mesh method (Shishkin mesh) are used to solve these problems. Necessary error estimates are derived and examples provided to illustrate the method.

• 전자공학회논문지B
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• 제29B권9호
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• pp.37-49
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• 1992

The standard definition of computational vision is a set of inverse problems of recovering surfaces from images. Thus the common characteristics of the most early vision problems are ill-posed. The main idea for solving ill-posed problems is to restrict the class of admissible solutions by introducing suitable a priori knowledge. Standard regurarization methods lead to satisfactory solutions of early vision problems but cannot deal effectively and directly with a few general problems, such as discontinuity and fusion of information from multiple modules. In this paper, we discuss limitations of standard regularization theory and present new stochastic method. We will outline a rigorous approach to overcome part of ill-posedness of image restoration, edge detection, and stereo vision problems, based on Bayes estimation and MRF(Markov random field) model, that effectively deals with the problems. This result makes one hope that this framework could be useful in the solution of other vision problems.

• 한국보육지원학회지
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• 제14권5호
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• pp.101-115
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• 2018

Objective: The goals of this research were (1)to examine the relationship among parental conflict, mothers' depression and preschoolers' sleep problems, and (2) to examine the mediating effects of mothers' depression between marital conflict and preschoolers' sleep problems. Methods: The participants were 1,639 mothers with preschoolers taken from the 5th year Korean Children Panel. Date were analyzed using descriptive statistics, partial correlation analysis, and multiple regression analysis. Results: The results were as follows: First, preschoolers' sleep problems were positively related to marital conflicts. Second, preschoolers' sleep problems were positively related to mothers' depression. Third, marital conflict was positively related to mothers' depression. Lastly, mothers' depression fully mediated the relationship between marital conflict and preschoolers' sleep problems. That is, marital conflict had an effect on preschoolers' sleep problem, only through mothers' depression. Conclusion/Implications: Based on the results, intervention programs should be developed to prevent preschoolers' sleep problems such as marital relationship improvement programs and mothers' depression improvement programs.

• 한국과학교육학회지
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• 제24권2호
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• pp.320-326
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• 2004

이 연구에서는 화학 영역에서 수리 문제 해결과 개념 문제 해결이 서로 영향을 미치는지를 조사하였다. 서울 소재 고등학교에서 사전 화학 성적이 유사한 4학급(N=112)을 선정하여 AC(Algorithmic-Conceptual problem) 집단과 CA(Conceptual-Algorithmic problem) 집단으로 무선 할당하였다. AC 집단의 학생들은 수리 문제 해결에 대한 학습을 수행한 후 개념 문제를 해결하였으며, CA 집단의 학생들은 개념 문제 해결에 대한 학습을 수행한 후 수리 문제를 해결하였다. 연구 결과, 수리 문제 해결에 대한 학습은 관련된 개념 문제의 해결력을 향상시켰으나, 개념 문제 해결에 대한 학습은 관련된 수리 문제의 해결력에 도움이 되지 못하는 것으로 나타났다. 문제 해결에 대한 자신감에서는 수리 문제 해결에 대한 학습이 관련된 개념 문제에 큰 영향을 주지 못했으며, 개념 문제 해결에 대한 학습도 관련된 수리 문제 해결에 대한 자신감에 큰 영향을 주지 못했다.