• Proceedings of the Korea Information Processing Society Conference
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• 2024.05a
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• pp.687-689
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• 2024

위암은 전 세계적인 주요 건강문제이며, 근치적 위절제술은 위암의 표준치료이다. 근치적 위절제술 후 치료목표는 합병증 발생을 낮춰 병전 상태로 빠르게 회복하는 데 있다. 따라서, 근치적 위절제술 후 합병증 발생 여부를 선별하여 예측할 수 있는 성능이 좋은 모델을 개발하는 것은 위암환자의 회복에 매우 중요하다. 랜덤포레스트 모델은 여러 개의 결정트리를 활용한 배깅 방식의 대표적인 알고리즘으로 의료 데이터를 기반으로 한 예측에 있어 뛰어난 성능을 보여 주었다. 그러나 실제 데이터는 불균형이 빈번하게 발생하여 모델의 예측 성능에 영향을 미치므로, 최적의 분류 임계값을 설정하여 다수 클래스에 대한 편향을 줄이는 것이 중요하다. 따라서, 본 연구는 최근 10년 간 일개 대학병원의 전자의무기록 데이터를 활용하여 근치적 위절제술 후 합병증 발생을 예측하는 랜덤포레스트 모델을 개발하고, 임계값 설정을 통해 불균형 데이터에 대한 모델의 성능을 평가하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.560-563
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• 2007

본 논문은 소프트웨어의 완성도와 관련하여 발주사와 개발사간의 분쟁이 있을 시에 필요한 분쟁조정을 위한 평가방법을 연구하였다. 먼저 소프트웨어 개발 과정에서 발생할 수 있는 분쟁의 유형을 분류하였고, 객관적인 평가를 위한 감정 절차를 분류하였다. 본 연구에서는 분쟁조정의 객관성 확보를 위한 가중치 설정, 각 기능들에 대한 중요도를 설정하여 어느 정도의 완성도를 보였는지를 정량적으로 평가하였다. 또한, 프로그램의 복제 문제를 판단하기 위하여 필요한 감정 항목 설정 및 도용 여부를 판단하기 위한 기본 자료로 활용될 수 있을 것으로 기대한다.

• Journal of Korean Home Economics Education Association
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• v.32 no.4
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• pp.103-124
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• 2020

The purpose of this study was to develop and implement a home economics convergence education program applying problem-based learning method focusing on the middle school food and nutrition life unit, and verify the effect of this class on the problem-solving ability of students. For this, the study set up the theme of 'sustainable life' by examining the relationship with other subjects, and set the key question as 'what is the relationship with the environment of food resources, the influence of individual level, and the solution method?' was postulated. And developed the problem and the total of 8 classes. As a result of conducting the convergence education program with home economics applying problem-based learning method, the pre-test and post-test scores were 3,54 and 3.96, respectively, which showed a significant increase in problem-solving ability (p<.001). There were significant differences in the dimensions of problem-solving ability, except for problem clarification. Therefore, it was confirmed that the home economics and convergence education program applying problem-based learning method is an effective class for improving students' problem-solving ability.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.8
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• pp.1659-1664
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• 2011

Fuzzy C-Means (FCM) is one of the most widely used clustering algorithms and has been used in many applications successfully. However, FCM has some shortcomings and initial prototype selection is one of them. As FCM is only guaranteed to converge on a local optimum, different initial prototype results in different clustering. Therefore, much care should be given to the selection of initial prototype. In this paper, a new initialization method for FCM using kernel density estimation (KDE) is proposed to resolve the initialization problem. KDE can be used to estimate non-parametric data distribution and is useful in estimating local density. After KDE, in the proposed method, one initial point is placed at the most dense region and the density of that region is reduced. By iterating the process, initial prototype can be obtained. The initial prototype such obtained showed better result than the randomly selected one commonly used in FCM, which was demonstrated by experimental results.

• Journal of The Korean Association For Science Education
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• v.26 no.2
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• pp.258-267
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• 2006

The purpose of this study was to investigate the practical use of process skill under the seventh curriculum at secondary school and teachers' perceptions about hypothesis. Two hundred and twenty-two secondary science teachers responded to a survey. Among all process skills, data interpretation was found to be used most frequently by science teachers. The second most-commonly utilized skill was conclusion, and the least employed skill was hypothesis formation followed closely by data transformation. In addition to these results, the most difficult process skill practised by science teachers was hypothesis formation, followed by data transformation, and controling variables. A majority of science teachers (63.1%) properly defined hypothesis, but only a significant number (5.0%) chose the correct example about hypothesis in real-world contexts. More than ninety percent of science teachers believed the skill of hypothesis formation could be put to use in junior high to senior high school, but practical use of the skill, was too difficult for the science class

• Journal of Korean Home Economics Education Association
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• v.23 no.1
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• pp.87-111
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• 2011

The purpose of this study was to develop and evaluate practical problem-based Home Economics lesson plans applying to the multiple intelligence teaching learning strategy, focused on the unit 'Nutrition & Meals' of middle school Home Economics subject matter. To achieve this purpose, the lesson plans were developed and evaluated from the 72 middle school students in Chongju after implementing the instruction. The data from the questionnaire were analyzed by SPSS/WIN 12.0 and content analysis. The results were as follows: First, the objectives of practical problem-based 'Nutrition & Meals' Instruction using multiple intelligence teaching strategy were to understand the importance of nutrition and health in an adolescent period and to develop good eating habits. The Practical Problem was 'What should I do for good eating habits?' and the learning contents were healthy life, the kinds and functions of nutriments, food pyramid and a food guide. The learning activities were progressed by various types of teaching and learning methods including 8 types of multiple intelligence teaching strategy. The lesson plans were developed according to the process of practical problem solving model. 6 periods of lesson plans and worksheets were developed. Second, the practical problem-based instruction using multiple intelligence teaching-learning strategy were evaluated to increase students' positive learning attitudes, motivation, and good eating habits.

• 전자공학회논문지 IE
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• v.45 no.4
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• pp.68-73
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• 2008

In this research, we proposed a learner tailoring question recommendation system for web based learning evaluation system. For teaming evaluation process, this system used the item difficulty Each question was stored and managed to the question bank. Item difficulty was recalculated during teaming process and feedback in next course. For learner tailoring question recommendation, learner could choice the teaming part and set the learning difficulty. In application result of proposal method, almost learner could improve learning score by controling teaming difficulty.

• Journal of The Korean Association For Science Education
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• v.22 no.2
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• pp.261-266
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• 2002

To investigate the pupils' ideas about appropriate scientific inquiry problem, we have chosen the 105 boys and girls of 7th grade in a middle school in Seoul, Korea. Their marks in science are within the highest one-third of their classes. The pupils have made their own scientific inquiry questions, which is to be investigated by themselves in summer vacation. The 105 inquiry questions were gathered and evaluated by the pupils with 5-point Likert scale. From these, we have found that the questions inquiring novel phenomena, questioning causality, or containing scientific terms were evaluated as appropriate. Some questions were changed during performance. The pupils have changed their inquiry problems if they feel any difficulties in performing the inquiry.

• Journal of the Korean Chemical Society
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• v.55 no.2
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• pp.290-303
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• 2011

The purpose of this study was to introduce the practical model on the enhancement of the divergent and convergent thinking skills through inquiry instruction in science class. In this study, the creative thinking skill has been defined by divergent thinking skill as the narrow sense. In the science field, the problem solving thinking skill is just same as the inquiry thinking skill. Also, the problem solving thinking skill has been defined by convergent thinking skill as the critical thinking skill. This new instruction had been used for the college student in the class of general chemistry laboratory for the one semester. The first results had been founded that the students' divergent thinking skill had been increased significantly. Especially, the skills of recognition of problems, the skills of making hypothesis, and the skills of transformation and interpretation of data had been increased significantly. The second results had been founded that the students' convergent thinking skill had been increased significantly. Especially, the skills of making hypothesis, the skills of transformation and interpretation of data, and the skills of making conclusion and generalization had been increased significantly. The third results had been founded that the students' the creative and problem solving thinking skill had been increased significantly. Especially, the rest of all skills exception the skill of control variables had been increased significantly.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.05a
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• pp.489-497
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• 2017

사물 인터넷, 클라우드 컴퓨팅, 인공지능, 빅데이터 등 첨단 정보통신기술을 활용하여 모든 사물들의 지능화와 초연결을 지향하는 것을 나타내는 4차 산업혁명에 대한 관심은 나날이 증가하고 있다. 4차 산업혁명과 관련된 다양한 분야의 기술들 중에서 인공지능을 활용한 자율주행자동차 기술과 관련하여 논의를 진행하고자 한다. 여러 국가에서는 자율주행자동차 시장선점을 위해 관련 기술의 발달에 몰두하고 있다. 그러나 자율주행자동차의 상용화를 위해서는 기술의 발달뿐만 아니라 관련 법제도의 정비가 더욱 필수적인 요소라고 본다. 자율주행자동차가 안전성을 보장할 수 있도록 시험운행에 대한 규제를 완화시켜야 할 것이며, 향후 상용화가 될 경우 야기될 수 있는 민사적 손해배상문제와 형사책임의 문제, 과실책임의 문제, 사이버 보안문제 등을 대비할 수 있는 법제도 마련을 촉구하고자 한다. 타국가와의 자율주행자동차 법제도 비교분석을 통해 우리나라의 도로교통법과 기존 법 제정상태를 고려하여 법안 마련에 방향성을 설정하는 데에 목표를 두고 있다.