• 스마트미디어저널
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• 제1권1호
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• pp.80-83
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• 2012

본 논문은 사이버공간의 가시성 개선 방안을 다루었다. 사이버비즈니스에 진출하고자 생각하는 많은 사업가들은 사이버공간의 비가시성 문제로 인하여, 사이버비즈니스 진출에 두려움을 가지고 있다. 본 논문에서는 사업자와 잠재고객 그리고 그 사이의 관계를 수학의 관계 개념을 도입하여 설명함으로서, 사이버공간의 가시성을 개선하고자 시도 하였다. 본 연구를 통하여 사이버비즈니스 경쟁력의 핵심은 가시화의 극대화와 신뢰성임을 알게 되었다.

• 천문학논총
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• 제23권2호
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• pp.91-107
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• 2008

In this paper, we introduce the performance evaluation and development of Raw VLBI Data Buffer(RVDB) system for the synchronized playback processing of observed data in Korea-Japan Joint VLBI Correlator(KJJVC). The high-speed correlation processing system is under development so that the radio data obtained with 8192 channels and 8 Gbps speed from 16 stations will be able to be processed. When the recorded data of each station are played to correlator, the time synchronization of each station is very important because the correlator should process the data obtained with same time and condition. There are many types of recorder systems in the East Asia VLBI Network (EAVN). Therefore it is required to prepare the special time synchronized playback processing system to synchronize the time tag of observed data. The developed RVDB system consists of Data Input Output(DIO), 10GbE switch, and Disk Data Buffer(DDB). It can record the data with maximum 2 Gbps speed, and can play back the data to correlator with nominal 2 Gbps speed. To enable to play back the data of different playback system to the correlator, we developed the high-speed time synchronized playback processing system. We carried out the experiments of playing back and correlation for gigabit correlator and VCS trial product so as to confirm the performance of developed time synchronized playback processing system. In case of online and offline playing back experiment for gigabit correlator, we confirmed that the online and offline correlation results were the same. In case of playing back experiment for VCS trial product, we verified that the wide band and narrow band correlation results were also the same. Through the playing back experiments of RVDB system, the effectiveness of developed RVDB system was verified. In this paper, the system design, construction and experimental results are shown briefly.

• 실천공학교육논문지
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• 제15권2호
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• pp.439 -447
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• 2023

본 논문은 메타버스 플랫폼 중 ZEP을 이용하여 최적화한 수업 공간에 대한 맵을 개발하는 것을 목표로 하였다. 연구 방법으로는 기존의 메타버스의 수업 경험을 바탕으로 학습의 주체가 학습자가 되도록 수업 공간을 구성하고, 초등학교 컴퓨터 수업에 적용하면서 수업 공간을 수정·보완하여 최적화하였다. 연구 내용은 학습자의 메타버스에 대한 사전 인식을 조사하였고, 메타버스 플랫폼의 장단점 들을 비교·분석하였다. 또한, 조사 결과를 반영하여 맵을 설계하였고, 설계된 맵을 수업에 적용한 후 필요한 API와 앱을 설치하여 보완하였다. 그 결과 학습자는 메타버스 공간에서 학습의 주체자가 되어 자유롭게 공간을 파악하고, 수업에 적극적으로 참여하였다. 특히, 오프라인에서 소극적인 학생, 실력이 부족하여 참여율이 저조한 학생은 더 적극적으로 참여하였다. 향후, 학습분석을 할 수 있는 학습자의 로그데이터를 수집할 수 있는 기능들을 API와 자바스크립트 프로그램 추가하여 학습자에게는 실시간 피드백이 가능하게 하고, 교수자에게는 통계 데이터를 가지고 학습자에게 피드백을 할 수 있도록 하는 것이다. 만약 이것이 가능하다면 메타버스 공간이 학습자에게는 학습 보조자 역할과 교수자에는 교수 보조자 역할을 충분히 기대할 수 있다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
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• pp.118-123
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• 1989

This work deals with fast-to-compute global control laws for time-optimal motion of strongly nonlinear dynamic systems like resolute robots. the theory of cell-to-cell mappings for dynamical systems offer the possibility of doing the vast majority of the control law computation offline in case of time optimization with constrained inputs. These cells result from a coarse discretization of likely swaths of state space into a set of nonuniform, contiguous volumes of relatively simple shapes. Once the cells have been designed, the bang-bang schedules for the inputs are determined for all likely starting cells and terminating cells. the resulting control law is an open-loop optimal control law with feedback monitoring and correction.

• 한국의류산업학회지
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• 제18권6호
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• pp.766-775
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• 2016

In the era of globalization and unlimited competition, Korean universities need a breakthrough in their education system according to the changing education landscape, such as lower graduation requirements to cultivate more multi-talented convergence leaders. While each student has different learning capabilities, which results in different performance and achievements in the same class, the uniform education that most universities are currently offering fails to accommodate such differences. Blended learning, synergically combining offline and online classes, enlarges learning space and enriches learning experiences through diversified tools and materials, including multimedia. Recently, universities are increasingly adopting video contents and on-offline convergence learning strategy. Thus, this study suggests a teaching method based on blended learning to more effectively teach existing pattern CAD and virtual CAD in the Apparel Pattern CAD class. To this end, this researcher developed a teaching-learning method and curriculum according to the blended learning phase and video-based contents. The curriculum consisted of 2D CAD (SuperAlpha: Plus) and 3D CAD (CLO) software learning for 15 weeks. Then, it was loaded to the Learning Management System (LMS) and operated for 15 weeks both online and offline. The performance analysis of LMS usage found that class materials, among online postings, were viewed the most. The discussion menu most accurately depicted students' participation, and students who did not participate in discussions were estimated to check postings less than participating students. A survey on the blended learning found that students prefer digital or more digitized classes, while preferring face to face for Q&As.

• 유통과학연구
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• 제17권2호
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• pp.71-76
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• 2019

Purpose - People have long thought that disorderly space would influence their lives negatively. However, disorderly space may have positive impact such as increasing sales for new products for store managers. Borrowing the prior findings that disorderly space enhances creativity, we developed two hypotheses regarding space order, product newness, and new product adoption. We hypothesize that space order negatively influences new product adoption and that the proposed negative effect of space order on new product adoption is moderated by product newness. Research design, data, and methodology - We conducted a pre-test in China using 70 undergraduate students to test whether two newly developed cosmetic products were appropriate for the experimental stimuli. We confirmed that a fragrance patch concept, which is unavailable in the market, is a RNP (Really New Product), and an edible fragrance, which is available in the market, is an INP (Incrementally New Product). Next, we conducted a main experiment with a 2 (Space order: orderly vs. disorderly) × 2 (Product newness: RNP vs. INP) between-subjects design in China using 100 undergraduate students. Half of the participants answered questions on the disorderly desk and the other half answered questions on the orderly desk. Results - We obtained evidence from the main experiment that consumers' new product adoption is the function of space order and product newness. First, participants were more likely to adopt the RNP when they were in the disorderly space than in the orderly space. However, the effect of space order on new product adoption disappeared when the product was INP; the adoption rates for the INP did not differ between the participants who answered questions on the disorderly desk and the participants who did so on the orderly desk. Conclusions - Our findings are counter intuitive. Contrary to the conventional wisdom that neat and tidy space benefits store managers, the research demonstrated that disorderly space increases sales, providing fresh insights into store managers to manage their stores and shops to sell new products. In order to help store visitors understand the value of really new products, store managers will have to sacrifice space order to some extent.

• 한국의류학회지
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• 제37권1호
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• pp.27-38
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• 2013

Word-of-mouth (WOM) communication (traditionally important in consumption) is expanding its influence into cyber space and is playing an important role in online shopping. Consumers who use online shopping might not readily make purchasing decisions due to information overload, lack of accurate product recognition, and the distrust of commercial information. Subsequently, people use WOM communication for a mutual interchange with others who share common concerns, interests, and purposes. This study examines the consumer characteristics, perceived risk on online shopping and benefits of online shopping according to WOM behavior that may significantly affect consumer actions. Factor analysis, t-test, one-way ANOVA, cluster analysis, and Chi-square analysis were used for statistical analysis to identify the differences in consumer characteristics. Online WOM behavior consumers purchased more various items than offline WOM behavior consumers; however, the most influential purchasing factor was price regardless of WOM behavior. Offline WOM behavior consumers have shown higher perceived online shopping risks and benefits.

• Journal of Electrical Engineering and Technology
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• 제13권5호
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• pp.2074-2079
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• 2018

Global state space's optimal policy is used for offline controller in the form of table by using Dynamic Programming. If an optimal policy table has a large amount of control data, it is difficult to use the system in a low capacity system. To resolve these problem, controller using the compressed optimal policy table is proposed in this paper. A DCT is used for compression method and the cosine function is used as a basis. The size of cosine function decreased as the frequency increased. In other words, an essential information which is used for restoration is concentrated in the low frequency band and a value of small size that belong to a high frequency band could be discarded by quantization because high frequency's information doesn't have a big effect on restoration. Therefore, memory could be largely reduced by removing the information. The compressed output is stored in memory of embedded system in offline and optimal control input which correspond to state of plant is computed by interpolation with Inverse DCT in online. To verify the performance of the proposed controller, computer simulation was accomplished with a one link inverted pendulum.

• 한국과학교육학회지
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• 제42권2호
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• pp.177-184
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• 2022

This article aims to explain the concept and characteristics of the 'Intelligent Science Lab', which is being promoted nationwide in Korea since 2021. The Korean Ministry of Education creates a master plan containing a vision for science education every five years. The most recently announced '4th Master plan for science education (2020-2024)' emphasizes the policy of setting up an 'intelligent science lab' in all elementary and secondary schools as an online and offline space for scientific inquiry using advanced technologies, such as Internet of Things and Augmented and Virtual Reality. The 'Intelligent Science Lab' project is being pursued in two main directions: (1) developing an online platform named 'Intelligent Science Lab-ON' that supports science inquiry classes, and (2) building a science lab space in schools that encourages active student participation while utilizing the online platform. This article presents the key features of the 'Intelligent Science Lab-ON' and the characteristics of intelligent science lab spaces newly built in schools. Furthermore, it introduces inquiry-based science learning programs developed for intelligent science labs. These programs include scientific inquiry activities in which students generate and collect data ('data generation' type), utilize datasets provided by the online platform ('data utilization' type), or utilize open and public data sources ('open data source' type). The Intelligent Science Lab project is expected to not only encourage students to engage in scientific inquiry that solves individual and social problems based on real data, but also contribute to presenting a model of online and offline linked scientific inquiry lessons required in the post-COVID-19 era.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권11호
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• pp.2940-2955
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• 2012

In this paper, we propose aggregate signcryption for achieving data security in UWSNs. The main challenge of these networks established in sensitive environments is offline sink visiting. Moreover, the sensors must retain collected data for long enough time to offload them onto the itinerant sink. Thus, the unattended nature of data collection intervals might offer the adversary the opportunity to apply various attacks without detection. In this paper, employing low order operations (in time and space), we propose a new secure scheme in which various security goals such as confidentiality (through encrypting), authentication and integrity (through signing) are achieved. In addition, the aggregation process of our scheme reduces the space and communication overheads both for sensors and sink, i.e. the proposed technique efficiently enables the sensors and sink to protect, verify and recover all the related data. We further compare our scheme with the best alternative work in the literature.