• Proceedings of the Korea Multimedia Society Conference
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• 2001.11a
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• pp.741-745
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• 2001

본 논문은 구성주의적 관점에서의 학습환경을 구축하기 위하여 설계·구현된 웹 기반 협동학습 시스템을 기술한다. 웹 상에서 인터넷을 통해 상호작용적인 의사소통을 촉진하고 자기 주도적 협동학습을 가능케 하기 위해 관리자, 그룹관리자, 학습자의 3가지 모듈을 구성·설계하였고, 과제와 평가 역시 서로 연동시킴으로써 보다 내실있는 시스템을 설계하였다. 따라서 본 연구는 현재 강조되고 있는 ICT(Information & Communication Technology) 찬용 교육에 있어 의다 효율적인 협동학습 공간을 구축하는 데 많은 도움을 줄 수 있을 것이다.

• Journal of KIISE:Information Networking
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• v.28 no.1
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• pp.154-163
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• 2001

인터넷으로 연결된 다수의 참여자를 지원하는 대규모 분산 가상 환경을 위한 확장성 있는 예측 기반 동시성 제어 방법을 제안한다. 예측 기반 동시성 제어 방식은 낙관적(optimistic) 방식과 같이 참여자들에게 실시간 상호 작용 성능을 제공함과 동시에 비관적(pesimistic)방식과 같이 잠금 허가를 받은 사용자에게만 객체 조작을 허용하므로 충돌을 확실히 방지할 수 있다. 본 논문에서는 사용자 수의 증가에 따른 확장성 있는 예측 알고리즘을 위하여 객체 중심 다중 전송그룹을 도입했다. 객체에 관심있는 객체주변의 사용자들만 객체에 할당된 다중 전송 그룹에 소유권 요청 메시지로서의 참여 메시지를 보냄으로써 소유자 후부가 된다. 현재 소유자는 소유자 후보들 중 다음 소유자를 예측한다. 가상 영역내의 모든 사용자 대신 객체의 할당된 다중 전송 그룹에 소유권 요청 메시지로서의 참여 메시를 보냄으로써 소유자 후보가 된다. 현재 소유자는 소유자 후보들 중 다음 소유자를 예측한다. 가상 영역내의 모든 사용자 대신 객체의 다중 전송 그룹에 참여하고 있는 사용자로부터만 소유권 요청 메시지를 받으므로 소유자가 받는 메시지 수는 가상환경의 전체 사용자의 수에 관계없이 상수값을 갖는다. 이는 소유자의 소유권 요청메세지 처리 시간을 줄여 보다 더 정확한 예측을 하고 사용자의 객체 조작 시간 전에 소유권이 전달되도록한다. 제안한 예측 알고리즘은 라이브러리로 구현되어 기존의 가상 환경 시스템에 적용되었고 실험을 통해 제안한 알고리즘이 대규모 가상 환경에서 갖는 효율성과 확장성을 증명한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2024.05a
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• pp.527-530
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• 2024

하이퍼그래프(hypergraph)는 실세계의 여러 객체가 함께 형성하는 복잡한 그룹 관계를 하이퍼엣지(hyperedge)로 정보 손실 없이 모델링할 수 있는 새로운 데이터 구조이다. 하이퍼엣지 예측(hyperedge prediction task)이란 하이퍼그래프로 표현된 실세계 네트워크에서 아직 관찰되지 않은 그룹관계 혹은 미래에 발생할 가능성이 높은 관계를 예측하는 것으로, 단백질 상호작용 분석(PPI), 추천시스템, 소셜 네트워크 분석 등 다양한 응용 분야에서 활용된다. 그러나, 하이퍼엣지 예측은 심각한 데이터 희소성 문제로 정확한 예측이 어렵다는 근본적인 한계를 지닌다. 이러한 한계를 완화하기 위해 다양한 네거티브 샘플링(negative sampling) 기술이 활용될 수 있는데, 아직까지 각 샘플링 기술이 하이퍼엣지 예측 정확도에 미치는 효과에 대해 충분히 연구되지 않았다. 본 논문에서는 하이퍼엣지 예측에 활용되는 다양한 네거티브 샘플링 방법의 효과를 분석한다. 실험 결과를 통해, 네거티브 샘플링 기법과 포지티브와 네거티브 하이퍼엣지 수의 비율에 따른 정확도 변화 양상을 분석한다.

• Journal of Digital Contents Society
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• v.14 no.1
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• pp.41-50
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• 2013

Social network analysis use the n nodes with l connections. About dozens or hundreds number of nodes are reasonable for social network analysis to the entire data. Beyond such number of nodes it will be difficult to analyze entire data. Therefore, it is necessary to separate the whole social networks, a method that can be used at this time is Clustering. You will be able to easily perform the analysis of the features of social networks and the relationships between nodes, if sub-group consists of all the nodes by Clustering. Clustering algorithm needs the interaction with the user and computer because it is need to pre-set the number of sub-groups. Sub-groups generated like this can not be guaranteed optimal results. In this paper, we propose dynamic sub-groups creating method using the external community association. We compared with previous studies by the number of sub-groups and sub-groups purity standards. Experimental results show the excellence of the proposed method.

• Korean Journal of Clinical Laboratory Science
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• v.53 no.4
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• pp.342-352
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• 2021

We used data from the 7th Korea National Health and Nutrition Examination Survey (KNHANES) (2016~2018) to investigate an association between high sensitivity C-reactive protein (hsCRP) and uric acid in the obese. Obesity was defined as a body mass index (BMI) of 25 kg/m² or more, severe obesity as a BMI of 30 kg/m² or more, and morbid obesity as a BMI of 35 kg/m² or more. In the complex samples multiple logistic regression, despite adjustment by adding major risk factors, the odds ratio (OR) for obesity was higher in the group with high levels of both, hsCRP and uric acid than the reference group at all stages (obesity, OR 1.89, P<0.001 vs. severe obesity, OR 5.04, P<0.001 vs. morbid obesity, OR 8.20, P<0.001). The association between hsCRP and uric acid in obese patients increased from 1.89 to 8.20 as the obesity level increased, suggesting that participants with increased BMI were significantly affected by hsCRP and uric acid. Moreover, the interaction between hsCRP and uric acid was statistically significant even in the model corrected for major confounding factors (P for interaction=0.009).

• Journal of the Korean Applied Science and Technology
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• v.35 no.4
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• pp.1185-1196
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• 2018

The purpose of this study was to investigate the effects of 12-week aquarobics exercise on blood lipids, atherogenic index, and liver functions in elderly women. The subjects for the study were 25 healthy elderly women volunteers, aged 65 to 80 years, composed of the aquarobics exercise group (n=13) and control group (n=12). Twice a week for 60 minutes for 12 weeks. The exercise intensity was set to RPE 11-12 for 1 week to 4 weeks, RPE 13-14 for 5 week to 8 weeks and RPE 15-16 for 9 week to 12 weeks respectively. The test data were analyzed by two-way repeated measures ANOVA, paired t-test, and independent t-test. The alpha level of .05 was set for all tests of significance. The results of the study in the aquarobics exercise group were as follows; LDL-C (p<.05), AST (p<.05) had significantly decreased, with TC (p<.01), TG (p<.05), LDL-C (p<.05), LDL-C/HDL-C (p<.05), TG/HDL-C (p<.05), AST (p<.001) significantly lower than control group. Consequently, these findings suggest that regular aquarobics exercise will be effective for preventiy the metabolic syndrome and cardiovascular health in elderly women.

• Journal of The Geomorphological Association of Korea
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• v.18 no.3
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• pp.37-51
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• 2011

Geomorphic changes and sedimentary changes are investigated by sediment analysis from estuarine tidal flat, Mosan Bay Estuary, which is a tide-dominated and rias estuary. Sediments separatedly deposited during the early Holocene and the late Holocene. There are unconformities between the early Holocene sediment unit and the late Holocene sediment unit. Developments of these unconformities were related with fluctuated sea level change during the mid Holocene. Three deposit zones are spatially classified, which are named "intermittent tide channel deposit zone"(A1, B1, D3), "flood-dominated deposit zone"(A3, B3, C1, C3), and "fluvial sediment deposit zone"(A2, B2). This classification is explained by three main effects; laterally restricted migration of a tidal channel, diffract flood effect and settling lag effect, and fluvial induced reworking. These effects are deserved as main factors which have formed estuarine geomorphology in tidedominated and rias estuary. This study suggests research directions in reconstructing estuarine geomorphic and sedimentary change in west coast of Korea. Furthermore, it gives useful data for making a "land-ocean interaction" model for west coast of Korea.

• Journal of KIISE:Computing Practices and Letters
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• v.7 no.6
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• pp.602-613
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• 2001

Recently, the computing has developing in distributed object computing environment for supporting a programming paradigm of distributed application requiring interoperability between heterogeneous clients and servers. It involves the complex networking and the object-oriented technologies for various multimedia application service. In this paper, we construct the real-time object group platform for solving the difficulties of managements of distributed objects and the real-time constraints by requiring for real-time service supporting of applications in distributed computing environment. The existing researches are being tried to only improving the performance of systems by using real-time CORBA itself, or modifying the part of CORBA compliance. Hence, we design a new model of real-time object group platform that can support the real-time requirement without modifying the ORB. The structure of our real-time object group analyzed and defined the requirement about object management and real-time application service sides. And the role of the components of real-time object group is divided into 2 classes for reducing the side effect of interoperability between management and service. Also, we considered how to transparently express the parameters of real-time properties for clients and developers of server's service objects. If the expression of real-time parameters is transparent, then the developer can easily extend the real-time parameters simply and flexibly. Therefore, in this paper we defined the role of components of platform and described functions of each component and designed and then implemented the real-time object group platform. Finally, we showed the execution procedures of implemented our platform for verifying the functionality.

• Journal of the Korean Applied Science and Technology
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• v.38 no.4
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• pp.951-962
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• 2021

The purpose of this study was to analyze the effects of smart machine circulation exercise on body composition, lung function, blood lipid and insulin resistance in obesity middle-aged women among 40-60 years by dividing them into a smart machine circulation exercise group(n=8), and control group(n=6). The smart machine circulation exercise program included 55-minutes sessions thrice each week at the following intensities: The strength of aerobic exercise is applied to smart machines by linking the smart machine with the POLAR T31; the 1-4 week is 40-50%HRR, 5-8 week is 50-60%HRR, and 9-10 week is 60-70%HRR. The strength of the resistance exercise was tested using a smart machine based on the constant velocity motion, and then, using the 1-RM data value, applied 40% 1-RM for 1-4 weeks, 60% 1-RM for 5-8 weeks, and 80% 1-RM for 9-10 week. As a results, body composition indicated that weight, BMI, %BF, WHR had a significant interaction effect. Lung function indicated that FVC levels significantly changes in the exercise group and the between groups difference in changes at 10week was significant. Also, FVC and FEV₁ significantly showed interaction effect. TC, TG and HDL-C levels significantly changes in smart machine circulation exercise group and the between-group difference in changes after 10 weeks was significant. TC, TG and HDL-C significantly showed interaction effect. Insulin resistance demonstrated that Insulin, Glucose and HOMA-IR levels significantly showed difference over 10 weeks between group. Therefore, the 10 weeks smart machine circulation exercise positively effects on the body composition, lung function, blood lipids, and insulin resistance in obesity middle-aged women and this smart machine circulation exercise can improve their obesity and prevent obesity.

• Journal of the Korean Applied Science and Technology
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• v.35 no.1
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• pp.306-315
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• 2018

The purpose of this study was to investigate the effects of football talents program on body composition, fitness, self-control and self-efficacy in elementary school students The subjects were eighty males students volunteers, composed of the lower group (n=40; 1-3th grade) and senior group (n=40; 4-6th grade). The test data were analyzed by paired t-test, independent t-test and two-way repeated measures ANOVA. The alpha level of p<0.05 was set for all tests of significance. The results of the study in the both group were as follows; The muscle mass in the body composition had significantly increased, and there was a significant difference between groups. Body fat mass had significantly decreased. Fitness(cardiorespiratory endurance, muscular strength, flexibility, power and agility) had significantly increased, cardiorespiratory endurance, muscular strength, and power was a significant difference between groups. Self-control and self-efficacy had increased significantly in both groups. Therefore, the football talents program had a positive effects on body composition and physical fitness levels of elementary school students. And it seems to be effective in increasing self-control and self-efficacy.