• Journal of The Korean Association For Science Education
• /
• v.25 no.4
• /
• pp.526-532
• /
• 2005

The purpose of this study was to analyze physics problem solving processes to qualitative and quantitative problems in the area of 'Force and Motion' in high school science. The students who have already learned the area of 'Force and Motion' during the first semester of 10th grade have taken physics test to choose students who have basic knowledge of physics. Eight students were selected. After explaining the purpose and the procedure of this study, think-aloud method was instructed to the students, and the students practiced it. After that, the students solved three problems in each quantitative and qualitative type. Then, the questionnaire of belief system on physics and physics problem solving and the prerequisite knowledge test were administered. By recording the students' solving processes, protocol was made and analyzed. After solving problems, the students expressed their confidence, intimacy, and preference. Quantitative problems needed much time at planning step than qualitative problems did. Moreover, solving time was longer and repeating frequency was more than those of qualitative problems. It seemed because even though the students qualitatively knew the answer, they should determine the given quantitative conditions, consider formulae, and recall the specific numbers. Since the students usually got access to many quantitative items in their physics study, they were accustomed to solve problems by using formulae. In addition, they put confidence in formulae, so they tended to solve problems quantitatively. As the result, they preferred quantitative problems to qualitative problems.

• Korean Journal of Construction Engineering and Management
• /
• v.12 no.1
• /
• pp.53-61
• /
• 2011

For construction projects, the importance of early cost estimates is highly recognized by the project team and sponsoring organization because early cost estimates are frequently a foundation of business decisions as well as a basis for identifying any changes as the project progresses from design to construction. However, it is difficult to accurately estimate construction cost in the early stage of a project due to various uncertainties in construction. To deal with these uncertainties, cost estimates should be made several times over the course of the project. In particular, early cost estimates are essential process for successful project management. For accurate construction cost estimates, it is necessary to compare cost estimates with actual costs based on historical project data. In this context, case-based reasoning (CBR), which is the process of solving new problems based on the solutions of similar past problems, can be considered as an effective method for cost estimating. To obtain this, it is also required to define the attribute similarities and the attribute weights. However, no existing method is capable of determining attribute weights of qualitative variables. Consequently, it has been a well-known barrier of accurate early cost estimates. Using Genetic Algorithms (GA), this research suggests the method of determining the attribute weight of qualitative variables. Based on building project case studies, the proposed methodology was validated.

• Journal of Korea Spatial Information System Society
• /
• v.10 no.2
• /
• pp.63-79
• /
• 2008

With the recent development of advanced GIS and complex spatial analysis technologies, the more sophisticated technologies are being required to support the advanced knowledge for solving geographical or spatial problems in various decision support systems. In addition, necessity for research on scientific crime investigation and forensic science is increasing particularly at law enforcement agencies and investigation institutions for efficient investigation and the prevention of crimes. There are active researches on geographic profiling to predict the base location such as criminals' residence by analyzing the spatial patterns of serial crimes. However, as previous researches on geographic profiling use simply statistical methods for spatial pattern analysis and do not apply a variety of spatial and temporal analysis technologies on serial crimes, they have the low prediction accuracy. Therefore, this paper identifies the typology the spatio-temporal patterns of serial crimes according to spatial distribution of crime sites and temporal distribution on occurrence of crimes and proposes STA-BLP(Spatio-Temporal Analysis based Base Location Prediction) algorithm which predicts the base location of serial crimes more accurately based on the patterns. STA-BLP improves the prediction accuracy by considering of the anisotropic pattern of serial crimes committed by criminals who prefer specific directions on a crime trip and the learning effect of criminals through repeated movement along the same route. In addition, it can predict base location more accurately in the serial crimes from multiple bases with the local prediction for some crime sites included in a cluster and the global prediction for all crime sites. Through a variety of experiments, we proved the superiority of the STA-BLP by comparing it with previous algorithms in terms of prediction accuracy.

• 대한공업교육학회지
• /
• v.42 no.1
• /
• pp.1-29
• /
• 2017

The purpose of this study was to investigate the vocational identity through the reflection of the major experience as the teacher through the life history of the technical high school. In order to achieve the purpose of this study, two technical high school mechanical and career teachers were selected as research participants and in-depth interviews were conducted with them. The data obtained through the in-depth interviews were analyzed through six steps. Six major experiences of the participants were identified as results of the research: (1) the experience of trying to train the specialist of precision machining in the beginning of teacher's life, (2) experience as a skill competition team teacher, (3) experience of innovating public education by introducing new industry field, (4) experience of constant learning new field and sharing with colleagues, (5) experience in the rapid change of the status of technical high school, (6) experience in the prevention of students' safety accidents and maintenance of the practice field. Through these educational experiences, each research participant was forming one's vocational identity as a mechanical teacher. The vocational identity of the research participants were identified as follows: (1) identity drifting phase, (2) identity stability stage, (3) transition stage of the teacher role, (4) suspended stage to preserve identity, (5) identification sublimation stage, (6) identification of the true meaning of the teacher, and integration of the identity. Through these six steps, their identities were formed, strengthened and changed at each stage.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.43 no.3
• /
• pp.360-366
• /
• 2014

Kimchi is a Korean traditional fermented food with various health functionalities. However, the protective effects of kimchi against Alzheimer's disease (AD) have not been studied yet. In this study, the protective activities of kimchi extract against oxidative stress and AD were investigated in an amyloid beta ($A{\beta}$)-induced AD model using ICR mice. Kimchi extract exerted strong scavenging activities against 1,1-diphenyl-2-picrylhydrazyl and hydroxyl radical. In addition, T-maze, object cognition, and water maze tests were carried out using the AD model. The $A{\beta}_{25-35}$-injected groups showed impairment of cognition and memory. However, the abilities of novel object recognition and new route awareness were improved by administration of kimchi extract (100 and 200 mg/kg/day) for 2 weeks. Furthermore, the results on water maze test indicated that kimchi extract exerted protective activity against cognitive impairment induced by $A{\beta}_{25-35}$. The present study suggested that kimchi protected against $A{\beta}$-induced impairment of memory and cognition as well as attenuated oxidative stress.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.42 no.8
• /
• pp.1190-1196
• /
• 2013

The purpose of this study was to investigate the mechanism and effects of different types of ginseng on memory improvement in an experimental rat model. In this study, SD rats were induced for memory deficits through scopolamine treatment (1 mg/kg, i.p.) then administrated with ginseng extract for 7 weeks. The rats were divided into five groups: saline (1 mL/kg, NC: negative control), white ginseng (300 mg/kg, WG), red ginseng (300 mg/kg, RG), black ginseng (300 mg/kg, BG), and scopolamine (1 mg/kg, PC: positive control). The step through latency of the BG and RG groups was significantly longer than the PC group in the retention trial of multiple trial passive avoidance test. In the spatial reference memory triads of the Morris water maze test, the latency time of BG and RG was significantly lower than the PC group. In addition, in the prove test, the time spent in the platform quadrant of BG and RG groups were significantly longer than the PC group. Brain choline acetyltransferase (ChAT) activities BG and RG groups significantly increased compared to other groups. On the other hand, the levels of malondialdehyde (MDA) were significantly lower in the BG and RG groups compared to other groups. These result suggested that black ginseng could be useful to enhance learning memory and cognitive function by regulation of cholinergic enzymes.

• Journal of Korea Game Society
• /
• v.16 no.6
• /
• pp.121-130
• /
• 2016

The purpose of this study was to develop the customized diet education game (Roly-Poly 160) for type II diabetes and to test its effectiveness. The diet education game for type II diabetic is composed of three kinds of modules as Meal self-management, Card Game, and Quiz Game. Meal self-management was developed to manage the dietary information of each day and to observe changes in the 12-month period. Card game is to find a changed card based on the recommended meal menu during a limited time and Quiz game is to learn knowledge while solving the quizzes about diet. Data was collected from September 28th to October 28th, 2016 at C hospital and G hospital in G district, and 5 times for 1 hour for every 30 people with type II diabetes who applied for diabetic diet education. Knowledge of diabetes and 2 hour postprandial blood glucose were measured repeatedly before and after the experiment. After the Roly-Poly 160 experiment, the knowledge of type II diabetes was statistically significantly increased (p = 0.04), and the fasting blood glucose and the 2 hour postprandial blood glucose decreased statistically decreased (p <.05) and Roly-Poly 160 game clinical efficacy was verified.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.21 no.4
• /
• pp.109-116
• /
• 2020

This study was undertaken to identify factors affecting the mental health of nursing students, including career motivation, sense of humor, and problem-solving ability, and to provide data for improving mental health of nursing students. This research enrolled 235 nursing students in B and Y cities. Data were collected from October 22 to October 31, 2018, and analyzed by applying t-test, ANOVA, Pearson's correlation coefficient, and multiple regression, using the SPSS/WIN 22.0. The average score for mental health was determined to be 2.19±0.77. Ed. Negative correlation was obtained between mental health and career motivation (r=-0.443, p<0.001), mental health and sense of humor (r=0.400, p<0.001), and mental health and problem-solving ability (r=0.465, p<0.001). Regression analysis showed that 33.4% variance in the mental health of nursing students is affected by gender (β=-0.121, p=0.033), pocket money (β=0.123, p=0.028), peer relation (β=0.165, p=0.004), sense of humor (β=-0.168, p=0.012), and problem-solving ability (β=-0.186, p=0.006). Data from this study indicates a necessity to repeat the study for identifying general characteristics and psychological factors that control an individual, and technical factors that can be acquired through learning. Taken together, we believe that the factors included and indicated in this study influence the mental health of nursing students.

• Journal of Korean Ophthalmic Optics Society
• /
• v.19 no.1
• /
• pp.99-104
• /
• 2014

Purpose: This study was to investigate the functional improvement in peripheral vision following eccentric viewing training. Methods: 14 subjects with normal vision took a part with their right eye, peripheral retinal which is $20^{\circ}$ lateral area from the fovea was examined for contrast sensitivity(CS). Eccentric viewing training was performed for 21days with an hour image viewing and examination was repeated. Results: The critical durations for 0.7 cpd were increased 2.67(467 ms) for pre-eccentric viewing training to 2.79(616 ms) for post-eccentric viewing training (p>0.05). The critical durations for 3.0 cpd were also increased 2.53(341 ms) for pre-eccentric viewing training to 3.04(1102 ms) for post-eccentric viewing training (p>0.05). Conclusions: It is recommended to use higher spatial frequency with higher CS for eccentric viewing training and to train more frequently for a short time. Moreover, the study on Korean standardizing of the visual rehabilitation for low vision based on the etiology is sorely required.

• 한국공간정보시스템학회:학술대회논문집
• /
• 2003.11a
• /
• pp.118-122
• /
• 2003

본 논문은 무선통신 환경에서 다양한 위치정보의 응용서비스인 위치기반서비스의 공통적인 기능을 가지는 지오코더 서비스를 설계하는 것이다. 위치기반서비스는 망이나 GPS 등의 측위기술을 이용하여 휴대 단말 등 사용자의 위치정보를 제공하는 것으로 최근 부가가치가 기대되는 서비스이다. 지오코더 서비스는 주소 등의 요청에 대해 X, Y, Z 등으로 표현되는 지리적 위치정보를 제공하는 서비스와 역으로 지리적 위치정보를 포함하는 요청에 대해 주소 등을 포함한 정규화 된 정보를 제공하는 역지오코더 서비스로 정의할 수 있다. 국내의 많은 웹 기반의 GIS 서비스들이 지형지물 등에 의해 지리적인 위치를 탐색하는 지오코딩 기능이 구현되어 있으나, 지리 정보에 대한 각각 서로 다른 인터페이스들이 사용되고 있어, 확장된 활용성에 한계를 가지고 있다. 특히, 무선통신 환경의 발전에 따른 효율적인 지리적 위치정보의 활용을 통한 다양한 위치기반서비스의 개발 및 활성화를 위하여 국제동향을 고려한 정규화 된 지오코더 서비스의 개발이 요구된다. 본 논문에서는 지리적 위치정보를 포함하고 있는 지오코더 서비스를 위하여 기술규격 범위와 요구기능 정의, 서비스를 위한 데이터의 정규화 및 인터페이스를 설계하여, 국내 무선통신 환경에서 다양한 위치기반서비스의 활용성을 높이기 위한 서비스 시스템 방안을 마련하고자 한다. 또한, 주소 정의에 있어서 국내 주소체계를 충분히 분석하여 구축하였다. 이는 본 연구자가 LBS 표준화 포럼을 통하여 작성 중인 '지오코더서비스 인터페이스 기술규격'을 수용한 것이다.적으로 분석하고, 지형정보의 체계적 관리를 위해 가장 필요한 해안습지 지형분류도를 작성하기 위해 가장 기초적인 단계인 해안습지 지형분류체계에 대한 국내외의 연구성과를 비교하여 시안을 작성 표준화를 위한 첫 단계 시도를 소개하였다.분석 결과는 문장, 그림 및 도표, 장 끝의 질문, 학생의 학습 활동 수 등이 $0.4{\sim}1.5$ 사이의 값으로 학생 참여를 적절히 유도하는 발견 지향적 인 것으로 조사되었다. 그러나 장의 요약은 본문 내용을 반복하는 내용으로 구성되었다. 이와 같이 공통과학 과목은 새로운 현대 사회에 부응하는 교과 목표와 체계를 지향하고 있지만 아직도 통합과학으로서의 내용과 체계를 완전히 갖추고 있지 못할 뿐만 아니라 현재 사용되고 있는 7종의 교과서가 교육 목표를 충분히 반영하지 못하고 있다. 따라서 교사의 역할이 더욱더 중요하게 되었다.괴리가 작아진다. 이 결과에 따르면 위탁증거금의 징수는 그 제도의 취지에 부합되고 있다. 다만 제도운용상의 이유이거나 혹은 우리나라 주식시장의 투자자들이 비합리적인 투자형태를 보임에 따라 그 정책적 효과는 때로 역기능적인 결과로 초래하였다. 그럼에도 불구하고 이 연구결과를 통하여 최소한 주식시장(株式市場)에서 위탁증거금제도는 그 제도적 의의가 여전히 있다는 사실이 확인되었다. 또한 우리나라 주식시장에서 통상 과열투기 행위가 빈번히 일어나 주식시장을 교란시킴으로써 건전한 투자풍토조성에 저해된다는 저간의 우려가 매우 커왔으나 표본 기간동안에 대하여 실증분석을 한 결과 주식시장 전체적으로 볼 때 주가변