• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2002년도 추계공동학술대회
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• pp.400-406
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• 2002

최근 인터넷에서는 인터넷 방송, 영상회의, VoIP 등 QoS 보장을 요구하는 새로운 응용 서비스들의 출현으로 서비스 품질 제공은 차세대 인터넷에서 가장 주요한 과제의 하나다. 하지만 현재의 인터넷은 모든 패킷을 동일하게 전달하는 BE(Best Effort) 서비스만을 제공하고 있기 때문에 서비스에 따른 패킷의 손실 또는 지연 등의 QoS에 대한 요구 사항을 보장해 주지 못하고 있다. 따라서 인터넷에서 서비스의 QoS를 보장해 주기 위해서는 현재의 모텔과는 다른 새로운 서비스 모델을 필요로 한다. 본 연구에서는 IP QoS와 관련하여 네트워크에서 QoS 지원을 위한 고려사항 등을 살펴보고, DiffServ 모델에서 QoS를 지원할 수 있는 동적노드 설정방법을 제시하고 이의 성능을 분석한다.

• 산업경영시스템학회지
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• 제34권4호
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• pp.106-113
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• 2011

Human resource theories of becoming entrepreneurs or self-employed rather than finding employment are compared as applied to fit the occupational data of technological entrepreneurs and technology jobs. The human capital theory posits that technological entrepreneurs are prepared to become a jack-of-all-trades with a variety of fields of education. Hobo theory of entrepreneurship assumes that entrepreneurs have strong taste against concentrating on a few activities, which tend to drive entrepreneurs away from employed jobs depressing their expected income. Another theory assumes that entrepreneurs have some unobserved productive qualities and abilities over employed people. Immigrant entrepreneurs could presumably be pressured out of employment under racial discrimination. Since technology jobs are mostly filled by those educated in the science and technology fields, and they presumably offer great reward to professional concentration, technological entrepreneurs may not benefit from becoming jacks-of-all-trades compared to finding employment in technological jobs income-wise. Asian immigrants in the 2000 US Census data are compared to white immigrants in technological jobs to test alternative human resource theories of entrepreneurship. Using English language ability as a proxy for the variety of education, I find in the white immigrant technological entrepreneurs support for the jack-of-all-trades theory, while in the Asian immigrant technological entrepreneurs hobo theory is supported. In the Asian technological workers only there appears the significant self-selection or comparative advantage component, while at the same time discriminatory components are significant.

• 디지털산업정보학회논문지
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• 제14권2호
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• pp.107-115
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• 2018

US Retailers consider two major holiday shopping days as their most profitable-the Friday after Thanksgiving, Black Friday, and the Monday after Thanksgiving, CyberMonday. Online shopping discount events have boosted up the shopping markets resulting in pumping up National economy. For such reasons, Korea also has launched online shopping discount event, which is called 'Cyber hot days'. The primary purpose of this paper is to understand consumer behavior on Cyber hot days and suggest how retailers can harness those consumer behaviors and how government agency can support both retailers and consumers to boost up shopping markets. The results of empirical test shows that economic value, emotional value, and product variety were found to be significantly related to consumers' attitude on Cyber hot days, but convenience value, social value, and product uniqueness were not. Consumers' attitude was also found to be significantly related to the repurchase intention. It implicates that price, enjoyment, and product variety are important aspects to Korean consumers when they purchase during online shopping discount event.

• 한국IT서비스학회지
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• 제9권2호
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• pp.151-161
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• 2010

Recently, as the era of ubiquitous has arrived, an infrastructure for the short-distance wireless communication has been extended socially, and thus a variety of services are being proposed. The Multimedia Contents Delivery System using the ZigBee, in particular, has an important stance in enlargement of a variety of services in the aspect of individual-oriented service support though Wireless Personal Area Network (WPAN). Nonetheless, the ZigBee, or the IEEE 802.15.4 Standard, has many restrictions on the Multimedia Contents Delivery System due to the low data transport rate. In order to improve the ZigBee which presents a limit on the transport rate at the IEEE 802.15.4 Standard, this thesis has designed the burst mode which is a method of transmitting a certain amount of data in block units at a high speed without any stoppage until the completion of the transmission. Also, to provide a Multimedia Contents Delivery Service with an application of the normal data transmission mode, it improved the transmission performance of the ZigBee. In addition, for the Multimedia Contents Delivery Service under the ubiquitous environment, it designed and implemented a broadcasting Multimedia Contents Delivery System based on the ZigBee to conduct a comparative analysis on the data transmission performance according to the transmission method.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권3호
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• pp.874-890
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• 2021

With the widespread deployment of the fifth-generation (5G) communication networks, various real-time applications are rapidly increasing and generating massive traffic on backhaul network environments. In this scenario, network congestion will occur when the communication and computation resources exceed the maximum available capacity, which severely degrades the network performance. To alleviate this problem, this paper proposed an intelligent resource allocation (IRA) to integrate with the extant resource adjustment (ERA) approach mainly based on the convergence of support vector machine (SVM) algorithm, software-defined networking (SDN), and mobile edge computing (MEC) paradigms. The proposed scheme acquires predictable schedules to adapt the downlink (DL) transmission towards off-peak hour intervals as a predominant priority. Accordingly, the peak hour bandwidth resources for serving real-time uplink (UL) transmission enlarge its capacity for a variety of mission-critical applications. Furthermore, to advance and boost gateway computation resources, MEC servers are implemented and integrated with the proposed scheme in this study. In the conclusive simulation results, the performance evaluation analyzes and compares the proposed scheme with the conventional approach over a variety of QoS metrics including network delay, jitter, packet drop ratio, packet delivery ratio, and throughput.

• 한국식생활문화학회지
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• 제24권4호
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• pp.433-439
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• 2009

The purpose of this study was to investigate the quality characteristics of tomato sauce, which is widely used in Western cuisine, according to tomato variety. The plum tomato sauce treatment had the highest pH at 4.13 while sauces made with Seo gwang and Young gwang tomatoes exhibited the lowest pH level of 4.07 (p<0.05). Sweetness was highest in the plum tomato sauce at $9.80^{\circ}$Brix. This might have been due to the fact that the plum tomato variety was the sweetest among the different tomatoes. There were no significant differences among the treatments in terms of reducing sugars, salinity, or viscosity. A color difference analysis indicated that redness (a-value) was highest in the plum tomato sauce, which contained a high level of lycopene. Sensory evaluations were performed by 15 professional panelists with scoring tests for color, flavor, taste, aftertaste, viscosity, and overall acceptability. The plum tomato sauce received the best scores in every evaluation, except for viscosity. These comparative results will support the development of better quality tomato sauce using plum tomatoes.

• 한국정보통신학회논문지
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• 제20권9호
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• pp.1791-1798
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• 2016

최근 스마트폰과 웨어러블 디바이스를 이용한 스마트 헬스케어에 대한 연구가 활발히 진행되고 있다. 스마트 헬스케어란 다양한 종류의 생체신호 측정 센서와 스마트 디바이스를 이용하여 개인화된 건강관리서비스를 제공받는 서비스를 말한다. 스마트 디바이스를 이용한 스마트 헬스케어를 위해서는 스마트 웨어러블 디바이스를 이용한 개인 건강관리 모니터링 서비스 중심의 연구뿐만 아니라 응급 상황 이후의 응급조치 방안을 위한 서비스에 대한 연구 또한 필요하다. 본 논문에서는 스마트 디바이스를 이용하여 그룹관리 기법을 이용하여 응급 상황을 모니터링 하고 상황을 전파하는 응급환자 지원 시스템을 제안하였다. 제안하는 시스템은 응급 상황을 판단했을 때 위치 정보를 기반으로 응급처치 지원자에게 연락을 취한다. 또한 스마트 디바이스를 이용하여 환자의 사진을 서버로 전송하면 환자의 정보를 화면에 제공하는 응급 지원 시스템을 설계 및 구현하였다.

• 한국학교보건학회지
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• 제32권3호
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• pp.144-151
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• 2019

Purpose: The purpose of this study is to examine academic stress, social support and learning management system(LMS) utilization satisfaction of learners attending online graduate schools and understand the factors influencing their academic persistence. Methods: The participants were students of K online graduate school and the data of 143 students, in total, were collected from April to May in 2019. For data analysis, frequency analysis, x² test, t-test, F-test, Pearson's correlation and multiple regression analysis were conducted using SPSS ver. 23. Results: Academic stress, social support, and LMS utilization satisfaction were associated with academic persistence of online graduate students. The multiple regression analysis of the factors influencing academic persistence showed that the model was significant (p<.001) with an explanatory power of 23% and that significant factors influencing it were academic stress (β=-.23, p=.002), LMS utilization satisfaction (β=.31, p<.001) and jobs (β=.23, p=.002). Conclusion: Although the online graduate students' level of academic persistence was high, it is required to develop strategies to alleviate their academic stress and increase LMS utilization rate in order to increase their persistence to academic success. In addition, it is necessary to provide the foundation on which the utilization of major knowledge regarding jobs can be enhanced, reflecting the characteristics of online graduate students. Furthermore, this study is expected to contribute to the extension of professional and advanced education in response to social needs by developing a variety of online high education learning systems beyond time and space.

• 한국정보통신학회논문지
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• 제16권10호
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• pp.2316-2322
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• 2012

본 논문은 선박 설계 엔지니어링 업무를 위한 표준화된 프레임워크의 설계를 통하여 통일된 정보보관 및 활용을 용이하게 하기 위한 연구를 하였다. 또한 본 연구에서는 사용자가 시스템의 메뉴 구성을 업무 프로세스에 맞게 재구성 할 수 있고 여러 단계의 업무프로세스 방식을 단순화하고 보다 직관적인 원 클릭 방식의 UI 환경을 제공한다. 기존의 엔지니어링 업무 방식은 다양하고 복잡하여 표준화된 업무방법이나 지식을 찾는데 시간의 낭비 및 업무의 오류를 유발하기 쉽다. 이러한 구조는 쓸모없는 데이터와 유용한 정보가 질서 없이 혼재 하게 되어 유용한 지식이나 데이터 재활용에 어려움을 발생하는 심각한 단점이 존재하게 된다. 본 연구는 앞에서 언급한 문제점을 효과적으로 해결하고 기존 시스템을 최대한 활용함으로써 시스템 운용비용의 최소화 및 업무의 효율성을 증가시킬 수 있는 선박 설계 엔지니어링 지원 시스템을 위한 프레임워크의 설계를 하였다.

• 한국융합학회논문지
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• 제10권12호
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• pp.477-486
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• 2019

본 연구는 결혼이주여성을 대상으로 배우자지지, 성적자율성, 성생활만족이 자기효능감에 미치는 영향을 확인하기 위한 서술적 조사연구이다. 자료 수집은 2019년 1월부터 3월까지 결혼이주여성 171명을 대상으로 조사하였다. 자료 분석은 ANOVA, Pearson's correlation coefficient, Multiple regression analysis로 분석하였다. 연구 결과 배우자지지는 3.64±0.86, 성적자율성 3.44±0.93, 성생활만족 3.14±0.90, 자기효능감은 3.06±0.64이었고, 모든 변수들 간에는 높은 양의 상관관계를 보였다(p<.01). 성관련 변인인 성적자율성과 성생활만족이 자기효능감에 미치는 강력한 예측 인자로 확인되었으며 설명력은 26.9%였다. 본 연구결과에 기초하여 결혼이주여성의 자기효능감을 높이기 위한 다양한 프로그램 개발 및 실천적인 접근방안을 모색할 것을 제안한다.