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  • Title/Summary/Keyword: 선택적 공유

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A Study on Mitigation Methods for Broadcast Storm Problem over Vehicular CCN (VCCN에서 Broadcast Storm 문제를 완화시키는 방법에 대한 연구)

  • Yeon, Seunguk;Chae, Ye-eun;Kang, Seung-Seok
    • The Journal of the Convergence on Culture Technology
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    • v.5 no.1
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    • pp.429-434
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    • 2019
  • There are several high technologies applied to the driving cars such as self-driving car and connected car for safe and convenient driving. VANET provides useful information such as route selection and gas price by communicating nearby cars and RSUs. VANET prefers CCN rather than traditional TCP/IP stack because CCN offers inherent multicast communication for sharing traffic information as well as traditional unicast. When all participating node rebroadcasts the Interest packets in a Vehicular CCN, the network may suffer from Broadcast Storm Problem. In order to mitigate the effect of the problem and to improve the Data packet transmission, not all but some selected nodes have to rebroadcast the packet. This paper simulates car movements using SUMO and evaluates data transmission performance using ns-3. According to the simulation results, when some selected nodes rebroadcast the Interest packets, the transmission performance improves 10% to 25% depending on the number of requesting nodes.

User Experience(UX) Qualitative Evaluation of Dialogue e-learning contents (대화형 이러닝 콘텐츠에 관한 사용자 경험(UX) 질적 평가)

  • Lee, Youngju
    • Journal of The Korean Association of Information Education
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    • v.24 no.6
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    • pp.623-631
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    • 2020
  • In the era of COVID-19 global pandemic, e-learning has become new standards and daily life in the name of 'new normal'. This study developed dialogue e-learning contents as opposed to monologue e-learning which is unidirectional and instructor centered and conducted qualitative user experience evaluation of dialogue e-learning contents. A total number of 20 adult students participated and were individually interviewed. Qualitative data analysis was performed. The findings include students' positive perceptions of dialogue e-learning contents such as empathy for various ideas and new format. With regard to personal preference, 55% of participants preferred dialogue e-learning contents because it enables them to focus and share real experiences. Meanwhile, in terms of learning effects, 60% participants selected monologue e-learning contents and mentioned adequate explanations of concepts and explicit information delivery. Based on the results, suggestions on the design and development of dialogue e-learning contents were presented.

Effects and Challenges of Cluster Curriculum of Gyeonggi-do Province in Korea: High School Students' Participation Experience in Health (고등학교 클러스터 교육과정의 성과 및 과제: 보건 교과목 고등학생의 참여경험)

  • Yang, Hye Kyung
    • The Journal of the Convergence on Culture Technology
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    • v.8 no.3
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    • pp.105-112
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    • 2022
  • This study is a qualitative study that analyzes the achievements and tasks of the cluster curriculum through the experiences of high school students who participated in the health cluster curriculum. As a result of the study, topics such as "Best Choice in a Competitive Environment," "Change in Health Perception," "Desire to Experience Various Health Worlds," "Limits in Non-regular Curriculum Operation," and "Feel Good Imagination" were derived. Through this study, students who participated in the cluster curriculum changed their perception of health positively, and confidence in career setting and career decision-making was improved through acquiring information on health care. However, supplementing the curriculum content in the specialized fields of health care, including classes and practice, was found to be a task to be improved. It is suggested that policy alternatives for career education should be developed by sharing the achievements and tasks raised in this study.

Factors Affecting Evasion of Second Childbirth among Working Mothers: Classification using Q Methodology (Q방법을 활용한 취업모의 둘째 자녀 출산기피 요인의 유형화 -대구·경북지역을 중심으로-)

  • Song, Yoo-Mee;Lee, Seon-Ja
    • The Journal of the Korea Contents Association
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    • v.16 no.2
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    • pp.714-728
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    • 2016
  • This research aims to categorize factors affecting reluctance of second childbirth among working mothers using Q methodology. P sample holds 50 working mothers between 20 and 45 years old living in Daegu-Gyeongbuk area. After securing the total 72 statements, the final 24 Q samples were confirmed through the second classification. As a result of this study, three types of the working mothers were classified. The first type that 22 working mothers (44%) were classified was "having uncooperative spouse". The second type which 13 working mothers (26%) were included was "working at not family-friendly workplace". Lastly, eight working mothers (16%) belonged to the third type, "having financial difficulty". Therefore, this study could confirm that the working mothers evade their second childbirth mostly because of the insufficient childcare support both at home and at work, rather than economic reasons. Thus, this study suggests that the Korean government should try to spread work-family balance culture than just providing financial support in order to encourage the second childbirth among working mothers.

Comparative analysis on Social Network Service users access : Based on Twitter, Facebook, KakaoStory (소셜네트워크서비스 사용자 접속요인 비교분석 : 트위터, 페이스북, 카카오스토리를 중심으로)

  • Hong, Sam-Yull;Oh, Jae-Cheol
    • Journal of Internet Computing and Services
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    • v.13 no.6
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    • pp.9-16
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    • 2012
  • Social Network Service (SNS) such as Twitter and Facebook has explosively grown nationwide since iPhone was introduced to Korea in 2009. In addition, KakaoStory has recently opened and joined to the SNS market, and it has grown to one of the most popular SNS in the domestic market in a short period of time. Social Network Service supports not only the formation of relationship between SNS users in common interests but also various activities such as management of personal connections and the sharing of information or contents. These three types of SNS have several common functions of sharing and distributing various contents rooted on the personal relationship formed through SNS. As each SNS user has specific reasons for the use of each service, a survey was conducted targeting those who use all of Twitter, Facebook, and KakaoStory was drawn by the statistical analyses of survey answers on users' reasons for each service. This result of study suggests factors to consider in order to exploit a new SNS or to enhance an existing service and can be used as a standard of which SNS for users to select for their own different purposes. It will also provide the basic data for the trust formation, one of the ethics in the upcoming Social Era.

Transbilayer Effects of n-Alkanols on the Fluidity of Model Membranes of Total Lipids Extracted from Synaptosomal Plasma Membrane Vesicles (n-Alkanols가 소의 대뇌피질 Synaptosomal Plasma Membrane Vesicles로부터 추출 제제한 총지질 인공세포막 이중층간에 형성된 비대칭적 유동성에 미치는 비대칭적 영향)

  • Yun, Il;Kang, Jung-Sook
    • The Korean Journal of Pharmacology
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    • v.28 no.2
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    • pp.191-199
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    • 1992
  • Selective quenching of 1,6-diphenyl-1,3,5-hexatriene (DPH) by trinitrophenyl groups was utilized to examine the transbilayer fluidity asymmetry of model membranes of total lipids (SPMVTL) extracted from synaptosomal plasma membrane vesicles (SPMV). The polarization (P), anisotropy (r), limiting anisotropy (r), and order parameter (S) of DPH in the inner monolayer were 0.031, 0.025, 0.033, and 0.070, respectively, greater than calculated for the outer monolayer of SPMVTL. Selective quenching of DPH by trinitrophenyl groups was also utilized to examine the effects of n-alkanols on the individual monolayer structure of SPMVTL. n-Alkanols fluidized the hydrocarbon region of bulk SPMVTL, and the potencies of n-alkanols up to 1-nonanol increased with carbon chain length. It appears that the potencies in bilayer fluidization increase by 1 order of magnitude as the carbon chain length increases by two carbon atoms. The cut-off phenomenon was reached at 1-decanol, where further increase in hydrocarbon length resulted in a decrease in pharmacological activity. The n-alkanols had greater fluidizing effects on the outer monolayer as compared to the inner monolayer of SPMVTL, even though these selective effects tended to become weaker as carbon chain length increased. Thus, it has been proven that n-alkanols exhibit selective rather than nonselective fluidizing effects within transbilayer domains of SPMVTL.

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Separation and Sensitive Determination of Sb Species using Yeast Bonded Bio-column with Continuous Hydride Generation (이이스트 고정 bio칼럼을 이용한 Sb의 화학종분리 및 연속적 수소화물발생법에 의한 감도개선)

  • Lee, Jeong-Ok;Kwon, Hyo-Shik;Pak, Yong-Nam
    • Journal of the Korean Chemical Society
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    • v.54 no.6
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    • pp.696-700
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    • 2010
  • Yeast is immobilized upon 100μm CPG(controlled pore glass bead) to separate Sb3+ and Sb5+. Continuous hydride generation is performed after the bio-column. The optimum conditions are 0.8 M nitric acid as an eluent with the flow rate of 1.0 mL min1 and the optimum conditions for the generation of hydride are 2 M HCl, 3% (w/v) NaBH4 with the flow rate of 0.83 mL min1, Ar carrier gas flow rate of 50 mL min1. Two species are separated at 112 and 354 seconds each. The sensitivity is enhanced by 10 times for 200μL of sample and the detection limits are 3.0 ppb and 7.0 ppb for Sb3+ and Sb5+, respectively. When compared with the standard samples, this method showed accurate results.

A Digital Twin Software Development Framework based on Computing Load Estimation DNN Model (컴퓨팅 부하 예측 DNN 모델 기반 디지털 트윈 소프트웨어 개발 프레임워크)

  • Kim, Dongyeon;Yun, Seongjin;Kim, Won-Tae
    • Journal of Broadcast Engineering
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    • v.26 no.4
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    • pp.368-376
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    • 2021
  • Artificial intelligence clouds help to efficiently develop the autonomous things integrating artificial intelligence technologies and control technologies by sharing the learned models and providing the execution environments. The existing autonomous things development technologies only take into account for the accuracy of artificial intelligence models at the cost of the increment of the complexity of the models including the raise up of the number of the hidden layers and the kernels, and they consequently require a large amount of computation. Since resource-constrained computing environments, could not provide sufficient computing resources for the complex models, they make the autonomous things violate time criticality. In this paper, we propose a digital twin software development framework that selects artificial intelligence models optimized for the computing environments. The proposed framework uses a load estimation DNN model to select the optimal model for the specific computing environments by predicting the load of the artificial intelligence models with digital twin data so that the proposed framework develops the control software. The proposed load estimation DNN model shows up to 20% of error rate compared to the formula-based load estimation scheme by means of the representative CNN models based experiments.

A Study on the Design of Metadata for Research Data Management in Forestry Engineering (임산공학 분야 연구데이터 관리를 위한 메타데이터 설계에 관한 연구)

  • Kim, Juseop;Han, Yeonjung;Youe, Wonjae;Kim, Suntae
    • Journal of the Korean Society for Library and Information Science
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    • v.54 no.4
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    • pp.169-194
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    • 2020
  • Recently, many academic fields are developing metadata to manage data produced in the field. Metadata to support a specific academic field beyond the general field is considered essential for searching, managing, sharing, and reusing research data in the field. Therefore, in this study, metadata items were derived to manage research data produced in forestry engineering. In order to derive metadata items, mapping work was performed on 7 metadata such as FGDC-CSDGM, ISO 19115, NEFIS, INSPIRE, ANZLIC, DataCite 4.3, and TTA.KO-10.0976. As a result of this study, 6 mandatory, 13 recommendations and 9 optional elements were derived. The derived metadata can be used as an item to systematically manage research data in the field of forestry engineering.

Efficient Exploration of On-chip Bus Architectures and Memory Allocation (온 칩 버스 구조와 메모리 할당에 대한 효율적인 설계 공간 탐색)

  • Kim Sungcham;Im Chaeseok;Ha Soonhoi
    • Journal of KIISE:Computer Systems and Theory
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    • v.32 no.2
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    • pp.55-67
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    • 2005
  • Separation between computation and communication in system design allows the system designer to explore the communication architecture independently of component selection and mapping. In this paper we present an iterative two-step exploration methodology for bus-based on-chip communication architecture and memory allocation, assuming that memory traces from the processing elements are given from the mapping stage. The proposed method uses a static performance estimation technique to reduce the large design space drastically and quickly, and applies a trace-driven simulation technique to the reduced set of design candidates for accurate Performance estimation. Since local memory traffics as well as shared memory traffics are involved in bus contention, memory allocation is considered as an important axis of the design space in our technique. The viability and efficiency of the proposed methodology arc validated by two real -life examples, 4-channel digital video recorder (DVR) and an equalizer for OFDM DVB-T receiver.