• Journal of Platform Technology
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• v.11 no.4
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• pp.80-88
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• 2023

To construct a learning model in the field of artificial intelligence, a dataset should be collected and be delivered to the central server where the learning model is constructed. Federated learning is a machine learning method building a global learning model without transmitting data located in a client side in a collaborative manner. It can be used to protect privacy, and after constructing a local trained model on individual clients, the parameters of the local model are aggregated centrally to update the global model. In this paper, we reuse the existing learning parameter to improve federated learning, describe incremental federated learning. For this work, we do experiments using the federated learning framework named Flower, and evaluate the experiment results with regard to elapsed time and precision when executing optimization algorithms.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.1418-1421
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• 2011

본 연구는 스마트폰과 스마트패드 이용자의 차별적인 특성을 규명하고, 모바일광고의 선호 유형에서 어떠한 차이를 보이는지 검증하고자 한다. 아직까지 스마트 디바이스 기반 모바일광고의 이론적 범위가 정형화되지 않은 시점이기 때문에, 광고수용자 관점의 광고인식이나 선호에 관한 연구는 미비하다. 모바일기기 이용자의 특성을 비교하기 위해, Jacques Attali(1992)의 노마드 이론을 토대로 개인정황관련성, 변화지향성, 속전속결성 변인과 성별, 연령, 학력, 직업, 생활방식의 인구통계학적 변인을 분석 기준으로 선정하였다. 또한, 선행연구에서 Q이론을 통해 발견한 바 있는 이용자 인식에 기인한 모바일광고 유형 분류체계를 양적 연구에 적용하여, 스마트폰 이용자 317명과 스마트패드 이용자 107명을 대상으로 서베이 조사를 수행하였다. 본 연구의 결과는 이동통신이나 광고 산업에서 이용자 세분화 및 모바일광고의 마케팅 전략 프레임워크나 이론적인 틀로서 활용가치를 기대할 수 있다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• fall
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• pp.304-307
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• 2021

ML(machine learning) 기술을 활용하여 실용적인 측면에서 일반 사용자들이 바라보고 사용할 수 있도록 다양한 연구 개발이 이루어지고 있다. 특히 최근 개인 사용자의 personal computer와 mobile device의 processing unit의 연산 처리 속도가 두드러지게 빨라지고 있어 ML이 더 생활에 밀접해지고 있는 추세라고 볼 수 있다. 현재 ML시장에서 다양한 솔루션 및 어플리케이션을 제공하는 툴이나 라이브러리가 대거 공개되고 있는데 그 중에서도 Google에서 개발하여 배포한 'Mediapipe'를 사용하였다. Mediapipe는 현재 'android', 'IOS', 'C++', 'Python', 'JS', 'Coral' 등의 환경에서 개발을 지원하고 있으며 더욱 다양한 환경을 지원할 예정이다. 이에 본 팀은 앞서 설명한 Mediapipe 프레임워크를 기반으로 Machine Learning을 사용한 image processing를 통해 일반 사용자들에게 편의성을 제공할 수 있는 알람 프로그램을 연구 및 개발하였다. Mediapipe에서 신체를 landmark로 검출하게 되는데 이를 scikit-learn 머신러닝 라이브러리를 사용하여 특정 자세를 학습시키고 모델화하여 알람 프로그램에 특정 기능에 조건으로 사용될 수 있게 하였다. scikit-learn은 아나콘다 등과 같은 개발환경 패키지에서 간단하게 이용 가능한데 이 아나콘다는 데이터 분석이나 그래프 그리기 등, 파이썬에 자주 사용되는 라이브러리를 포함한 개발환경이라고 할 수 있다. 하여 본 팀은 ML기반의 영상처리 알람 프로그램을 제작하는데에 있어 이러한 사항들을 파이썬 환경에서 기본적으로 포함되어 제공하는 tkinter GUI툴을 사용하고 추가적으로 인텔에서 개발한 실시간 컴퓨터 비전을 목적으로 한 프로그래밍 라이브러리 OpenCV와 여러 항목을 사용하여 환경을 구축할 수 있도록 연구·개발하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.259-262
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• 2021

팬데믹 시대를 맞아 전세계적으로 원격의료에 대한 수요가 높아졌고, 이에 따라 원격의료의 보안 위험도 급증하고 있다. 원격의료는 각각의 원격의료 참여자가 서로 보안수준이 상이한 물리적 공간에 있으면서 의료행위에 참여하고, IT와 의료기기 비전문가인 개인이 자신의 공간에서 다수의 의료기기를 운용해야 하는 경우가 많으며, 서비스형태에 따라 실시간 데이터 교환이 이루어져야 한다는 점에서 일반적인 의료와 다른 보안 이슈가 발생한다. 이와 같은 특성의 원격의료 보안 위험 대응방안 연구를 위하여 관련 표준을 검토해 보았으나, ISO/IEC 및 미국 NIST의 일반보안 표준으로부터 분기한 의료 일반에 대한 보안표준이나 의료기기 보안 가이드는 존재하지만 원격의료보안을 포괄적으로 정립한 표준을 찾을 수 없었다. 이에 따라 국제적으로 통용될 수 있는 원격의료보안 표준의 개발이 시급하며, 이를 위하여 원격의료에 대한 용어 정의, 원격의료 참조모델 규정, 원격의료 보안모델 개발이 필요하다. 향후 이와 같은 원격 의료 구성 요소들을 정의하고 구성 요소들 간의 상호작용과 환경적 보안 취약성 및 위협, 보안 요구사항을 정립한 원격의료 보안프레임워크 수립이 수행되어야 할 것이다.

• The Journal of the Convergence on Culture Technology
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• v.10 no.1
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• pp.245-252
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• 2024

This study sought to identify the interactive relationship between the individual cognitive characteristics of perceived consumer effectiveness and the impact of the message framing type of a fashion brand's sustainable marketing on consumers' brand trust. As a result of the study, it was confirmed that the fashion brand's message framing type increased consumers' perceived consumer effectiveness, and that the recipient's perceived consumer effectiveness each influenced the formation of consumers' trust in the brand. It was confirmed that the fashion brand's message frame directly had a positive effect in forming consumers' brand trust.

• Journal of Digital Convergence
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• v.10 no.1
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• pp.215-228
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• 2012

This study aims to answer the research question of what are the global leadership competencies(GLC) and what is the integrating framework of GLC? To attain the goal of reframing the GLC models with systematic research on GLC, the specific objectives are delineated as follows; the first objective is to identify the area of GLC. The second one is to extract the dimensions agreed with consensus. The third one is to suggest the reframed GLC model. Through the literature review and content analysis about GLC and global mindset, the two dimensions-subject and objects-of GLC model are emerged to classify the existing clusters of GLC. The extracted objects are self, others, culture, business, and global world. The dimension of subject who is global leader is more specifically divided into the knowing/doing process and three aspects of human activity like cognitive, emotional, and behavioral one. GLC are reframed and rearranged based on the two dimensions. As a results new framework for GLC with 11 clusters are presented. Knowing group of GLC contains personal, social, cultural, business literacy, and global mindset. Doing group of GLC contains personal, social, cultural, business savvy, and global change. Personal traits as a core character are at the core of the knowing and doing process of the self. Lastly, the implications and limitations of this research are suggested, and suggestion for further research is followed.

• Journal of Nutrition and Health
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• v.50 no.6
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• pp.664-678
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• 2017

Purpose: To identify the effectiveness of policy evaluation, consistent monitoring is necessary. This study aimed to carry out mid-term evaluation of objectives and programs related to comprehensive plans for sodium intake reduction by 2020 for Seoul city and then reestablish the objectives of the sodium intake reduction plans. Methods: Literature reviews, data analysis, and reviews of expert focus-groups were performed to evaluate objectives, to develop a new goal, and to identify the priority subjects of the sodium intake reduction programs. In order to examine target populations for the programs, awareness and behaviors related to sodium intakes among Seoul citizens were examined by sex, age, and income level using the 2008~2013 Korea National Health and Nutrition Examination Survey data. Results: Current objectives of the sodium intake reduction plan by 2020 for Seoul city were not appropriate, so objectives were reset to 3,600 mg of sodium intake by 2020 among Seoul citizens with 2% reduction per year. Although sodium intake showed a decreasing trend by year, it was still high, especially in men. The sodium intake reduction programs currently in progress have not been assessed at multiple levels across multiple sectors and have only been assessed fragmentarily. For dietary behavior related to sodium intakes by sex, age, and income level, sodium intake was higher in the group with less than 100 g of fruit intake compared to the group with 100 g or more. Subjects aged 30~59 years and the low household income group showed relatively higher sodium intakes. Based on the data analysis and the expert review, the priority subject of the sodium intake reduction programs was determined to be adult men. In terms of a program strategy for sodium intake reduction, multi-level and setting approaches, including work sites, home, and restaurants, were suggested to reduce sodium intakes of the target subject. Conclusion: The suggested objectives should be consistently monitored by data analysis, and the determined programs need to be phased in over 5 years.

• Journal of The Korean Association of Information Education
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• v.20 no.3
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• pp.293-302
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• 2016

It is the latest fashion of interesting with software education in public school environment and also consider as high priority issue of curriculum for college freshman with programming 101 courses. The block-based programming tool is used widely for the beginner and provides several positive features compare than text-based programming language tools. To measure quality of programming code elaborately which is based script language, it is need to very tough manual process. As a result the previously research related with evaluation of block-based script code has been focused very simple methods in which normalize the number of blocks used which is related with programming concept. In such cases in this, it is difficult to measure structural vulnerability of script code and implicit programming concept which does not expose. In this research, the framework is proposed which enable to measure and evaluate quality of code script of block-based programming tools and also provides method to find of vulnerability of script code. In this framework, the quality metrics is constructed to structuralize implicit programming concept and then developed the quality measure and vulnerability model of script to improve level of programming. Consequently, the proposed methods enable to check of level of programming and predict the heuristic target level.

• Journal of KIISE:Computing Practices and Letters
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• v.14 no.2
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• pp.143-157
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• 2008

Ubiquitous Web Services is able to be specified future Web Services technology for connecting with various application services in any device and network environments. The devices, in ubiquitous environment, have dynamic characteristic such as location and statuse. So, we must support methods of dynamic service discovery in ad-hoc network. There are many related works at transaction, security, QoS, semantic and Web Services composition with various fields. Recently, the studies are interested in the Ubiquitous by development of computing and network technology. However, they are an early stage. For this reason, in this paper, we propose a WSUN(Web Services on Universal Networks) for Ubiquitous Web Services. It is a SOA based framework. And this paper extracts necessity of WSUN environment from scenario. The framework is composed of US Broker(Universal Service Broker). It is designed for satisfying the conditions and supports dynamic service discovery using a US Registry (Universal Service Registry). Consequently. clients are able to discover and use Universal Service by protocol stack of the US Broker for Web Services. And it is a strong point which supports interoperability between heterogeneous networks.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.12 no.6
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• pp.89-98
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• 2017

The dynamic entrepreneurial activities of small businesses or individual entrepreneurs seeking to enter the global market based on innovative ideas and challenging spirit in the modern society, which is trending in entrepreneurial capitalism according to the times, Leading to new growth engines. In order to promote the establishment of universities in Korea, the government has been working on 'Five-Year Plan for University Entrepreneurship Education(2013-2017)', 'Efficiency of Government Start-up Support in 2015', and 'Five-Year Basic Plan for Activation of Industry-University Cooperation(2016-2020)'. However, there are still practical limitations in spite of the efforts made by universities and research institutes to revitalize start-ups. As a way to overcome these limitations, this study aims to systematize the entrepreneurship education of the university, and examines the role of changing universities and theory of clusters and the entrepreneurship education. In addition, we will look at the factors of creative university culture centering on the representative cases of the Innovation University in US, and present a conceptual framework for cluster-based entrepreneurship education for the purpose of 'successful entrepreneurship' which is different from 'start-up success'. The conceptual framework of cluster-based entrepreneurship education is based on the establishment of 'Integrated Entrepreneurship Education Platform' to revitalize start-ups centered on university technology. At the same time, this framework focuses on the three factors of talent, technology, and culture based on the relevant theories and examples, and emphasizes the clustering of entrepreneurial resources, entrepreneurial policies and leadership that should be involved in entrepreneurship education.