• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.2
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• pp.239-250
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• 2022

LoRa is a physical layer technology designed to secure highly reliable long-range communication with introducing loco parentis tree network and chirp spreading spectrum. Since since a leaf can send message to more than one parents simultaneously with a single transmission in a region, packet delivery ratio increases logarithmically as the number of gateways increases. The delivery ratio, however, dramatically collapses even under loco parentis tree topology due to the limitations of ALOHA-like primitive MAC, . The proposed method is intended to exploit SDMA approach to reuse frequency in an area. With the view, TxPower of each sender for each message in a concurrent transmission is elaborately controlled to survive the collision at different gateway. Thus, the gain from the capture effect improves the capacity of resource-hungry Low Power and Wide Area Networks.

• Journal of Korean Library and Information Science Society
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• v.53 no.4
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• pp.25-44
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• 2022

The purpose of this study is to examine how the content components of information literacy textbooks develop and is to find implications for improving of textbook publication. Three kinds of information literacy textbooks were published sequentially over time. The content components of 『Information and media』(1996) and 『Library and information skills』(2011) are processed by filament structure and 『Information and library』(2002) has a topic-driven project activity. Generally, a small lesson unit of the textbook consisted of three components (learning goals, learning contents, learning activities) and each component in the unit have to make semantic close relationships. However, in some information literacy textbooks, there are cases that the semantic relationship between goals, contents, and activities are cut off. This disconnection cases can be a fatal drawback for the reliability of textbooks, so sufficient attention is needed to develop information literacy textbooks later.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.194-198
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• 2021

LoRa is a physical layer technology that is designed to provide a reliable long-range communication with introducing CSS and with introducing a loco parentis tree network. Since a leaf can utilize multiple parents at the same time with a single transmission, PDR increases logarithmically as the number of gateways increases. Because of the ALOHA-like MAC of LoRa, however, the PDR degrades even under the loco parentis tree topology similarly to the single-gateway environment. Our proposed method is aimed to achieve SDMA approach to reuse the same frequency in different areas. For that purpose, it elaborately controls each TxPower of the senders for each message in concurrent transmission to survive the collision at each different gateway. The gain from this so-called capture effect increases the capacity of resource-hungry LPWAN. Compared to a typical collision-free controlled-access scheme, our method outperforms by 10-35% from the perspective of the total count of the consumed time slots. Also, due to the power control mechanism in our method, the energy consumption reduced by 20-40%.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.01a
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• pp.49-51
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• 2022

본 논문에서는 신생아집중치료실에 입원한 미숙아와 가족 대상의 증강현실(Augmented Reality [AR])기반 맞춤형지지 케어 프로그램 개발에 필요한 관련 전문가 합의를 도출한 델파이 조사 연구이다. 3D 콘텐츠를 적용한 프로그램 개발에 필요한 핵심 구성요소 혹은 교육 콘텐츠를 발굴하여 개발의 방향성을 제안하기 위한 델파이 분석에, 미숙아 및 전문가 집단 14명(1차)과 113명(2차)이 본 연구에 참여하였다. 각 델파이 집단에서 수집된 반응들의 분석 결과, 4개의 하위영역(AR 프로그램의 필요성 및 가치(장점), AR 기반 프로그램 도입과 적용 시 고려할 점, AR 기반 전인적 e케어 프로그램 도입 시 요구와 전략적 방안, 입원 초기부터 퇴원 전 단계별 지지케어 위한 3D 콘텐츠 개발 우선순위)이 분류되었으며, 총 57문항이 도출되었다. 입원 초기부터 퇴원 전 단계별 지지케어 위한 3D 콘텐츠 개발 요구도와 우선순위에 있어서는, 부모 경우 신생아 케어의 반복적 체험 훈련 통한 부모 교육, 아기 본연의 독특하고 고유한 캐릭터나 습관 및 특성 관련 정보 공유, 발달을 돕는 양육 또는 놀이 교육, 가족 요구 기반 특수 간호 기술 훈련 등의 항목의 우선순위가 높았다. 한편, 전문가의 경우 건강한 부모역할로의 이행을 돕기 위한 심리사회적지지, 부모-아기 간 단절 최소화, 미숙아 발달 관련 정보 및 양육 또는 놀이 정보 공유, 부모-아기 상호작용 기회 제공 등으로 요구도의 우선순위가 높았다. 본 연구에서 개발된 델파이 평가문항의 내적일관성 신뢰도를 분석한 결과, Cronbach's α .89~.94로 높았고, 타당도와 문항 구성이 적절한 것으로 나타났다. 본 연구의 결과들을 바탕으로, 미숙아와 가족을 위한 AR 기반 맞춤형지지 케어 프로그램 개발의 적합성이 검증되었고, 프로그램의 임상적, 기술적, 사용적 가치에 있어서 고려할 사항과 교수매체로서 부모와 전문가 집단이 요구하는 3D 콘텐츠 우선순위를 바탕으로 효과적인 기획 및 설계의 근거를 확보했다는 점에서 의의가 있다.

• Journal of Advanced Navigation Technology
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• v.26 no.6
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• pp.481-486
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• 2022

The recent rapid growth of the IoT(Internet of Things) is leading to the spread of low-power wireless technology. A major challenge in designing IoT wireless networks is to achieve coexistence between different wireless technologies that share the 2.4 [GHz] ISM (Industrial Scientific Medical) frequency band. Therefore, there is a need for research on improving the reliability of wireless networks and coexisting operation between wireless networks. In particular, it is necessary to study an interference model and performance for mutual service coexistence in a BLE (Bluetooth Low Energy) wireless network environment, which is expected to be widely used as a connection medium between devices in various industrial fields. In this paper, the co-channel interference model with the IEEE 802.15.4 system is established focusing on the physical layer of the BLE system widely used in residential and industrial wireless applications, and the performance of the BLE wireless communication system is analyzed in the co-channel interference environment. As a result of the analysis, as the distance between the interference source and the BLE system increases in an environment where noise and co-channel interference exist, the amount of co-channel interference decreases and the error rate performance of the BLE system improves.

• Journal of Korean Society of Archives and Records Management
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• v.24 no.1
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• pp.31-46
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• 2024

This study provides a synthesis of the fundamental concepts of "art archives" and "archival art" while undertaking a reconsideration of the latter. Archival art refers to "artworks or art practices that utilize archival structures or methodologies." Accepted as a new trend in contemporary art, archival art is evaluated as a counternarrative and reconstructs histories that are marginalized and omitted from the public sphere. This approach reveals the contradictory nature of criticizing the contemporary archive from an anti-archival perspective while simultaneously presenting the archive as a core identity of the work. Given the limited research on archival art, often with potential contradictions regarding record authenticity, this study expands the concept of archival art, includes archaeological aspects, classifies types, and analyzes their characteristics. By approaching artists' use of archives from a traditional archaeological lens, this study broadens the scope of the examination.

• Journal of the Korean Society of Clothing and Textiles
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• v.28 no.12 s.138
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• pp.1562-1570
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• 2004

The main purpose of this study was to investigate the elements which influence the symbolic consumption in clothing. Materialism and agent of socialization have been studied and the affect of these two are also developed. The theoretical study and survey methods were used. The survey was administered to 426 women in their twenties living in Seoul and Kyungki region. SPSS packages were applied to find out the results of ANOVA Duncans multiple range tests, means, standard deviation, factor analysis, and regression analysis. The major findings of this study could be summerized as follows; First, the subordinate parts of symbolic consumption was divided into these three parts; fashion oriented consumption, brand oriented consumption, hedonic consumption. The average of hedonic consumption was higher than other subordinate parts of symbolic consumption. Second, symbolic consumption was seemed to have the differences according to materialism and its subfactors. The higher materialism indicated, the higher symbolic consumption was. Third, symbolic consumption was proven to have the differences according to agent of socialization such as reference group and mass media. The higher the influence of the reference group and mass media was, the higher symbolic consumption was. Fourth, according to the results of the regression analysis examing the relative influences of variables affecting symbolic consumption in clothing, the influence of the reference group was the most important variable. The influence of mass media and materialism was related positively to the symbolic consumption.

• Journal of Korean Home Economics Education Association
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• v.24 no.4
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• pp.59-75
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• 2012

This study investigated the self-perception of body image and awareness of diet of high school students in Zibo city, China. The data were collected from 260 high school students through the self-administered questionnaires. Frequency analysis, t tests, one-way ANOVA, Duncan's multiple range tests, factor analysis and Cronbach's alpha test were conducted by SPSS Windows V.19.0. The results were as follows. In the self-perception of body image, two fifths of the respondents thought of themselves as standard body image. More female respondents thought of themselves as fat persons compared with male respondents. The level of concern about diet was generally low and the mean for pursuit of skinny figure was highest in the awareness of diet. The percentage of correct answers of knowledge about diet was not that high, and one fifths of respondents had experience of diet. The respondents practiced fasting therapy, exercise therapy, food therapy, sweat therapy, drug/appliance therapy, and therapy using professional organization in order for diet.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.11 s.353
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• pp.118-127
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• 2006

The wireless transmission medium inherently broadcasts a signal to all neighbor nodes in the transmission range. Existing asynchronous MAC protocols do not provide a concrete solution for reliable broadcast in link layer. This mainly comes from that an omnidirectional broadcasting causes to reduce the network performance due to the explosive collisions and contentions. This paper proposes a directional broadcast protocol by using neighborhood information in the link layer based o,1 directional antennas, named MNDB (MAC protocol with Neighborhood for reliable Directional Broadcast). This protocol makes use of neighborhood information and DMACA (Directional Multiple Access and Collision Avoidance) scheme through 4-way handshake to support a reliable directional broadcast. To analyze its performance, MNDB protocol si compared with $RMDB^{[1]}$, the protocol 2 of reference [3], and IEEE 802.11 $protocol^{[9]}$, in terms of the number of collisions, the number of dropped packets, the number of redundant packets, and broadcast delay.

• The Journal of the Korea Contents Association
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• v.20 no.5
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• pp.303-317
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• 2020

As the penetration rate of smart phones has spread and functions have been developed variously, a new advertising medium called mobile advertising has emerged. In addition, various mobile advertisements targeting teenagers, where most of their daily lives are conducted using smartphones, have been activated. Adolescents in the modern society called Generation Z have the longest time to use a smartphone among age groups. Even during the economic downturn, adolescent consumers are an important consumer group that can overcome the economic recession, so mobile advertisements targeting their purchasing power are being created like a flood. Therefore, in this study, the influence of mobile advertisement characteristics and personal characteristics on purchasing attitudes for adolescents using smartphones was identified, and how this was linked to purchasing behavior again. To conduct the research, a survey was conducted on 324 high school students using smartphones, and the results are as follows: First, the higher the recognition of convenience in mobile advertising characteristics and brand preferences, the higher the brand preference. Characteristics and brand trust had a positive effect on acceptance as the awareness of convenience, information, and entertainment increased. Third, the influence of adolescents' personal characteristics on purchasing attitudes had a positive effect on brand preferences by pursuit of fashion, pursuit of personality, and practical pursuit. Fourth, as a result of analyzing the relationship between purchase attitude and purchase behavior, it was verified that brand preference and brand trust among purchase attitude have a positive influence on purchase behavior. This study has significance in that it has grasped the influence of mobile advertising on purchasing behavior among teenagers who are rapidly growing as mobile consumers.