• Journal of Korean Home Economics Education Association
• /
• v.26 no.2
• /
• pp.89-99
• /
• 2014

Purchasing behavior for upcycled fashion products was examined along with analysis on environment consciousness, clothing recycling behavior, interest in fashion and awareness of upcycling. Students from middle schools, general high schools and design high schools participated in this research from August to September in 2013. 732 questionnaires were analyzed by SPSS WIN. Firstly the levels of environmental consciousness, clothing recycling behavior and interest in fashion of students were high, low and mediate respectively. Female students showed higher environmental consciousness compared to male ones and clothing recycling behavior were found to be higher in students of design high schools than those of general ones. The level of interest in fashion was found to be higher in students of general high school than those of middle school, and this was higher in design high school students than those of general ones. Secondly, more than half of students were unaware of upcycling. Female students and students of design high schools were highly aware of upcycling. Students who were aware of upcycling showed high level of environmental consciousness, clothing recycling behaviour and interest in fashion. Thirdly, students had low experiences in purchasing upcycled fashion products and the reason was lack of awareness of upcycling. The reason that students purchased upcycled fashion products was the uniqueness and design. Students who purchased upcycled fashion products showed high environmental consciousness, clothing recycling behaviour, and interest in fashion.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.39B no.10
• /
• pp.691-699
• /
• 2014

In order to increase network lifetime, duty-cycle MAC protocols which can reduce energy consumption caused by idle listening is proposed for WSNs. In common duty-cycle MAC protocols, each sensor node calculates its duty-cycle interval based on the current amount of residual energy. However, in WSNs with the capability of energy harvesting, existing duty-cycle intervals based on the residual energy may cause the sensor nodes which have high energy harvesting rate to suffer unnecessary sleep latency. Therefore, a duty-cycle scheduling scheme which adjust the duty-cycle interval based on both of the residual energy and the energy harvesting rate was proposed in our previous work. However, since this duty-cycle MAC protocol overlooked the performance variation according to the change of duty-cycle interval and adjusted the duty-cycle interval only linearly, the optimal duty-cycle interval could not be obtained to meet application requirements. In this paper, we propose three methods which calculate the duty-cycle interval and analyse their results. Through simulation study, we verify that network lifetime, end-to-end delay and packet delivery ratio can be improved up to 23%, 44% and 31% as compared to the existing linear duty-cycle scheduling method, respectively.

• LOGISTICS
• /
• v.2 no.3 s.5
• /
• pp.32-35
• /
• 2004

최근 삶의 질이 향상되면서 환경문제에 대한 인식이 점차 증가하고 있다. 이러한 환경문제를 물류측면에서는 어떻게 이해하고, 기업입장에서는 환경물류 시스템 설계는 어떻게 접근 할 것인지에 대한 의견을 제시해보고자 한다. 환경물류의 접근에는 우선 자원절약, 재활용, 친환경 대체재, 폐기 및 배출물의 제로화를 통하는 방법이 필요하다. 이에 환경물류의 개요와 제품 라이프 사이클과 환경물류흐름, 그리고 환경물류시스템 설계에 대해서 2회에 걸쳐 게재한다.

• LOGISTICS
• /
• v.2 no.4 s.6
• /
• pp.58-61
• /
• 2004

최근 삶의 질이 향상되면서 환경문제에 대한 인식이 점차 증가하고 있다. 이러한 환경문제를 물류측면에서는 어떻게 이해하고, 기업입장에서는 환경물류 시스템 설계는 어떻게 접근 할 것인지에 대한 의견을 제시해보고자 한다. 환경물류의 접근에는 우선 자원절약, 재활용, 친환경 대체재, 폐기 및 배출물의 제로화를 통하는 방법이 필요하다. 이에 지난호에서는 환경물류의 개요와 제품 라이프 사이클과 환경물류흐름, 그리고 이번호에서는 환경물류시스템 설계에 대해서 2회에 걸쳐 개재한다.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.18 no.3
• /
• pp.347-353
• /
• 2008

The realization of intelligence by using ontology is getting attention recently. However, it is necessary to design ontology models suitable to their purpose in order to use efficiently the intelligence realized by ontology. In this paper, we define a cognition cycle for intelligent agents representing a process that the intelligent agents recognize an event and react to it. Moreover, we design an ontology-based intelligent agent, and propose an ontology model that is possible to change the agent's states, to express its emotions, and to expand its intelligence through ontological inference. Finally, we develop an intelligent agent named Helen, confirm the change of her inner states according to the environment and situation, and show the easiness of the extension of her intelligence.

• Journal of Satellite, Information and Communications
• /
• v.11 no.3
• /
• pp.119-122
• /
• 2016

Feature detection is recognized as an accurate spectrum sensing approach when the information of the desired signal is partly known at the receiver. This type of detection was proposed to overcome large noise environment. Cyclostationary detection is an example of feature detection in spectrum sensing technique in cognitive radio. However, the cyclostationary process calculation requires a lot of processing time and information about the designed signals. On the other hand, energy detection spectrum sensing is widely known as a simple and compact spectrum sensing technique. However, energy detection is highly affected by large noise and lead to high detection error probability. In this paper, the combination of energy detection and cyclostationary is proposed in order to increase the accuracy and decrease the calculation and processing time. The two-layer threshold is utilized in order to reduce the complexity of computation and processing time in cyclostationary which can lead to the improved throughput of the system. The simulation result shows that the implementation of energy-based cyclostationary detector can help to improve the performance of the system while it can considerably reduce the required time for signal detection.

• Electronics and Telecommunications Trends
• /
• v.30 no.2
• /
• pp.104-114
• /
• 2015

최근 무선통신서비스의 수요 급증에 따른 주파수 부족 심화 현상에 대해 제한된 주파수 자원의 재분배와 같은 해결책으로는 근본적인 극복이 어렵다는 공감대를 바탕으로 주파수 공유에 대한 연구가 다양한 분야에서 진행 중이다. 특히 인지무선기술은 무선통신에 관련된 모든 기술분야와 밀접하게 연관되어 다양한 기술분야의 협업을 통한 현 문제점을 해결할 수 있는 도전 기술임은 자명하다. 인지무선기술을 적용한 다양한 기술 표준들은 마무리 되었거나 마무리 단계에 있지만, 광의적 개념의 CR(Cognitive Radio)기술 측면에서 보면 아직도 해결해야 할 기술 이슈들이 산재해 있으며, 이러한 이유로 2014년 가트너 하이프 사이클상 태동기(innovation trigger)에 위치해 있다. 따라서, 본고에서는 최근 진행되고 있는 CR 관련 국내외 표준화 동향 및 기술개발에 대해 정리하고, 해결해야 할 주요 기술별 도전 이슈들에 대해 제시하고자 한다.

• Fashion & Textile Research Journal
• /
• v.16 no.1
• /
• pp.111-117
• /
• 2014

This study investigated the perception of upcycling for sensitive university students in regards to fashion trends. It was conducted through questionnaires delivered to male and female college students who majored in clothing related subjects from June 2012 to June 2013 in Gwangju. The contents for this research are general details, seriousness of environmental resources, awareness of upcycle, and purchasing intention for upcycling products. Most of the respondents said that recycling of resources is absolutely necessary due to the impact of environmental pollution and the consumption of resources. On the contrary, the experience of the respondents which purchased recycling products was low. The awareness of also was low, upcycling, internal upcycling brands and internal consumption groups, however, the decisions for subsequent purchases were positive. The reasons for the unsatisfactory of upcycling of products were due to quality and price. The reaction for many upcycle goods had the best question response rate in daily supplies part; subsequently, this study suggested 3 items, apparel products, fashion accessories, and daily supplies. In addition, a group which contains people who expend more for clothing had a lower awareness of upcycle and purchasing intention than other groups that contained some people who expend less. The results of the study can be used in data that recognize the necessary of upcycle education for university students, and develop educational programs. It can also encourage the purchase of upcycle products that reduce the consumption of resources.

• The Research Journal of the Costume Culture
• /
• v.26 no.6
• /
• pp.899-918
• /
• 2018

Upcycling is the process of repurposing abandoned resources or useless products into products of better quality or higher environmental value. Upcycling products are evaluated to be sustainable because they demonstrate environmental values. However, domestic upcycling companies are operating on a small scale with a slow growth rate. This study aims to examine the value and risk factors of upcycling products from previous literature and clarify the effect of these ambivalent characteristics on purchase intention. This provides direction regarding factors upcycling companies should focus on. The data were collected via an online experiment with women in their 20s and 30s residing in South Korea, nationwide. The data were statistically analyzed using SPSS 21.0 and AMOS 18.0. Analysis of this data suggests that environmental, design, and self-expression value positively affect purchase intention. This extends previous upcycling literature by identifying design and self-expression value as important antecedents of purchase intention. However, in contrast to previous literature, no significant effect of performance or diversity risk was found. These results indicate that ethical attitude has a moderating effect on the relationship between environmental value and purchase intention. This study confirms that consumers intend to purchase upcycling products when they possess not only environmental value but also design and self-expression value.

• Journal of Korea Multimedia Society
• /
• v.13 no.8
• /
• pp.1183-1193
• /
• 2010

The pyramid graph is well known in parallel processing as a interconnection network topology based on regular square mesh and tree architectures. The enhanced pyramid graph is an alternative architecture by exchanging mesh into the corresponding torus on the base for upgrading performance than the pyramid. In this paper, we adopt a strategy of classification into two disjoint groups of edges in regular square torus as a basic sub-graph constituting of each layer in the enhanced pyramid graph. Edge set in the torus graph is considered as two disjoint sub-sets called NPC(represents candidate edge for neighbor-parent) and SPC(represents candidate edge for shared-parent) whether the parents vertices adjacent to two end vertices of the corresponding edge have a relation of neighbor or sharing in the upper layer of the enhanced pyramid graph. In addition, we also introduce a notion of shrink graph to focus only on the NPC-edges by hiding SPC-edges within the shrunk super-vertex on the resulting shrink graph. In this paper, we analyze that the lower and upper bounds on the number of NPC-edges in a Hamiltonian cycle constructed on $2^n{\times}2^n$ torus is $2^{2n-2}$ and $3{\cdot}2^{2n-2}$ respectively. By expanding this result into the enhanced pyramid graph, we also prove that the maximum number of NPC-edges containable in a Hamiltonian cycle is $4^{n-1}$-2n+1 in the n-dimensional enhanced pyramid.