• KSII Transactions on Internet and Information Systems (TIIS)
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• 제18권5호
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• pp.1223-1237
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• 2024

Autonomous vehicles use onboard sensors to sense the surrounding environment. In complex autonomous driving scenarios, the detection and recognition capabilities are constrained, which may result in serious accidents. An efficient way to enhance the detection and recognition capabilities is establishing collaborations with the neighbor vehicles. However, the collaborations introduce additional challenges in terms of the data heterogeneity, communication cost, and data privacy. In this paper, a novel personalized federated learning framework is proposed for addressing the challenges and enabling efficient collaborations in autonomous driving environment. For obtaining a global model, vehicles perform local training and transmit logits to a central unit instead of the entire model, and thus the communication cost is minimized, and the data privacy is protected. Then, the inference similarity is derived for capturing the characteristics of data heterogeneity. The vehicles are divided into clusters based on the inference similarity and a weighted aggregation is performed within a cluster. Finally, the vehicles download the corresponding aggregated global model and train a personalized model which is personalized for the cluster that has similar data distribution, so that accuracy is not affected by heterogeneous data. Experimental results demonstrate significant advantages of our proposed method in improving the efficiency of collaborative perception and reducing communication cost.

• 디지털콘텐츠학회 논문지
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• 제2권2호
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• pp.199-208
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• 2001

문화컨텐츠산업은 21세기 국가 경쟁력의 핵심과제로 세계 경제는 자본 노동 중심에서 지식과 창의력이 주도하는 지식기반 경제로 신속히 전환하는 추세이다. 인터넷의 확산은 세계경제를 산업사회와 디지털경제로 구분 짓는 혁명적인 전환점이라고 하겠다. 우리 나라도 인터넷을 통한 커뮤니케이션이 일반인들에게 더 이상 새로운 것이 아닌, 일상생활로 인식되어 지고 있다. 인터넷이 정보원으로서의 웹의 기능성을 추구하는 것만으로는 더 이상 눈길을 끌 수 없으며 보다 감각적인 차원에서 사용자에게 부각 될 수 있는 사용 환경이 요구되고 있으며 현재의 동영상, 특히 애니메이션은 사용자의 흥미와 지속적인 접속을 유도하고 엔터테이먼트 요소를 갖고 있어 인터넷 교육 사이트의 경직성과 지루함을 극복할 수 있는 매체로 부각되고 있다. 인터넷상에서 애니메이션의 매체의 특성과 유형을 살펴보고 사용자의 다양한 요구와 사용자 편의를 위한 웹 상에서의 애니메이션 활용하고있는 교육컨텐츠 분야에 대해 연구한다. 웹 상에서 인터페이스를 평가하기 위해서는 평가의 기준이 되는 모델을 개발되어진 웹 그래픽 인터페이스의 시지각 평가 모델을 사용하여 웹 애니메이션의 활용도와 개선 방안에 대하여 연구하도록 한다.

• 한국유통학회지:유통연구
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• 제15권2호
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• pp.101-122
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• 2010

본 연구에서는 인터넷 쇼핑 사이트를 이용하여 의류 구매시 느끼는 긍정적, 부정적 감정이 쾌락적, 실용적 가치지각에 미치는 영향과, 이러한 쾌락적, 실용적 가치지각이 점포접근행동에 미치는 영향관계를 연구하였다. 이 연구를 위하여 Babin and Attaway가 오프라인 쇼핑 사이트 연구에 활용한 연구모형을 인터넷 쇼핑상황에 적용하여 연구모형을 제시하고 실험자료를 통하여 검증하였다. 인터넷 쇼핑몰을 통해 의류상품을 쇼핑하는 과업을 수행하고 제시된 설문 문항에 응답하도록 하는 실험을 실시하여 278명의 결과가 통계분석에 이용되었으며 탐색적/확인적 요인분석과 Amos 6.0을 활용한 구조방정식 모형 검증을 실시하였다. 구조방정식 모형검증 결과 인터넷 의류 쇼핑 사이트에 대해 부정적인 감정을 많이 느낄수록 사이트에 대한 쾌락적, 실용적 가치지각이 낮았으며, 긍정적인 감정을 많이 느낄수록 사이트에 대한 쾌락적, 실용적 가치지각이 높았다. 이렇게 지각된 인터넷 의류쇼핑사이트의 쾌락적, 실용적 가치는 태도에 긍정적인 영향을 미치나, 재방문의도에는 실용적 가치만이 긍정적인 영향을 미쳤다. 본 연구결과를 바탕으로 이론적, 실무적 시사점들이 제시되었다.

• 한국의류학회지
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• 제32권8호
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• pp.1274-1285
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• 2008

The purpose of this study is to investigate influences of perceived price dimensions and store attributes on store choice behavior. Three major retail formats, department store, discount store, and internet shopping mall in retail industry were compared with respect to store attributes and intention to purchase fashion products. Data were obtained from 427 consumers aged 25-49 years old. The results were as follows. (1) Multidimensional aspects of the price construct were identified: price-quality schema, prestige sensitivity, price mavenism, value consciousness, price consciousness, and sales proneness. (2) Store attributes included product assortment, quality per price (Q/P), service, and symbolic image in general. However, store attribute factors of three retail formats consisted of slightly different items. Department stores presented the highest level of mean scores on product quality, customer service, and symbolic images, while internet mall exhibited highest on product variety, information comparison, and quality per price. (3) Respondents presented high level of intention to purchase fashion products at internet mall, department store, and discount store in that order. (4) Purchase intention at department store was predicted by Q/P, service, symbolic image, prestige sensitivity, product assortment, clothing consumption, and age in order. Purchase intention at discount store was influenced by assortment & Q/P, symbolic image, clothing consumption, and sales proneness, whereas internet mall was predicted by product assortment, Q/P, service, price mavenism, and price-quality schema.

• 한국벤처창업학회:학술대회논문집
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• 한국벤처창업학회 2007년도 춘계학술대회
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• pp.405-433
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• 2007

본 연구는 온라인 쇼핑몰의 쿠폰판촉이 소비자의 구매행동에 미치는 영향을 검증하였다. 분석 결과는 다음과 같다. 첫째, 쿠폰 인지정도에 따라서는 F-검증을 실시한 결과 쿠폰의 인지여부에 따라 쿠폰 제공시 사용의사와 쿠폰 제공시 재사용의사에서는 유의미한 차이가 있는 것으로 나타났다. 둘째, 쿠폰의 사용경험에 따른 구매행동의 차이를 전체적으로 살펴보면 쿠폰사용 경험이 있다가 없다보다 높은 평균을 보여 유의미한 차이가 있는 것으로 나타났다. 이러한 결과는 쿠폰 사용경험에 따라 구매행동에 차이가 있음을 시사하고 있다. 셋째, 구매행동과 쿠폰의 비용/편익 자각의 관계를 살펴보면 뚜렷한 정적 상관관계가 있는 것으로 나타났다. 이는 쿠폰의 비용/편익 자각이 높을수록 구매행동이 높아짐을 의미한다. 넷째, 구매행동은 쿠폰사용을 즐김과 쿠폰 사용습관과 가장 관계가 높음을 발견하였다.

• ETRI Journal
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• 제28권1호
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• pp.67-76
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• 2006

This study aims to identify the factors that influence adoption intentions towards portable Internet service, based on the individual characteristics that assist in creating markets and developing strategies. Two types of factors are defined: individual characteristics including demographics, existing services usages, prior knowledge, adoption attitudes, and service evaluations; and adoption intentions including the willingness to subscribe, subscription term, willingness to pay, usage type, and preferred terminal. The results indicate that the importance of demographic variables depends on adoption intentions, and that users of mobile Internet service and wireless LAN are probably targets for portable Internet service. Furthermore, the results demonstrate the need for an enhanced perception of the usefulness and ease of use of service, as well as an intensive marketing activity for potential users and a bearable innovation to stimulate the market for portable Internet service.

• Asia pacific journal of information systems
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• 제17권1호
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• pp.77-93
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• 2007

Risk has been considered as one of very important topics in traditional consumer behavior theoretically and practically since its tendency of minimizing errors rather than maximizing utilization in addition to its intuitive appealing with very high explaining power. In addition to a traditional view of risk, importance of risk in online transactions such as Internet banking is due to technical instability in security of the Internet as well as temporal and spatial separation of transaction partners. Therefore, risk in online transactions should be analyzed by a very comprehensive way since it is very inherent in the Internet. The objective of this study is to suggest a research model for explaining the use of online transactions in some risk related variables including risk results, security result, perceived security, and social influence and show its validity by applying it to Internet banking users. In result, hypotheses suggested by our research model are shown to be valid ones.

• International Journal of Internet, Broadcasting and Communication
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• 제12권3호
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• pp.177-188
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• 2020

The Muslim population is growing significantly in Asian countries. By conducting an experiment, this study examines the cultural differences between South Korean and Indonesian female, young adults, and their perception of hijabis who are represented in the media. The main goal of this study is to compare the perception towards hijabis in a homogenous country new to Muslims against a Muslim-majority country. Results showed that non-hijabis were deemed more physically attractive, empathetic, and enjoyable among Koreans when compared to Indonesians. Through this study, we provide a theoretical explanation using cultivation theory and (parasocial) contact hypothesisto clarify the differences between South Korea and Indonesia. Thisstudy provides a baseline of understanding to determine where both cultures are at in perceiving hijabis. Our results suggest that it will be compelling to correct media representation in order to reduce stereotypes and lead to a successful understanding of both cultures.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권8호
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• pp.3986-4007
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• 2016

Business analysis is a key factor of project success or failure in information systems. However, there are few studies on business analysis competencies. The objective of this paper is to identify which competencies a business analyst (BA) needs, and analyze the importance weights and priorities of business analysis competencies. Literature review yielded 6 competency dimensions and 30 competencies. Based on interviews with 12 experts and analytic hierarchy process analysis, the relative importance weight and priority of each business analysis competency were analyzed. Moreover, an importance-perception gap between stakeholders in different positions was identified. This result can be used as selection and development criteria for superior BAs that are responsible for solving business problems using information systems solutions.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권2호
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• pp.550-565
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• 2018

Cognitive radio technology is still the key technology of future mobile communication systems. Previous studies have focused on improving spectrum utilization and less energy consumption. In this paper, we propose an Overhead Reduced Scheme (ORS) for green cooperative spectrum sensing. Compared to traditional cooperative sensing scheme, ORS scheme divides the sensing time into three time slots and selects the best multi-mode user to report decisions. In consideration of reporting channel deviation, we derive closed-form expressions for detection probability and false alarm probability of ORS scheme based on Rayleigh fading channel. Simulation results show that ORS scheme can improve the perception accuracy while reducing the perceived delay and energy consumption in the process of perception, so as to realize the green communication.