• KSII Transactions on Internet and Information Systems (TIIS)
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• 제5권9호
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• pp.1492-1512
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• 2011

Due to multiple hops, mobility and time-varying channel, supporting delay sensitive real-time traffic in wireless local area network-based (WLAN) mesh networks is a challenging task. In particular for real-time traffic subject to medium access control (MAC) layer control overhead, such as preamble, carrier sense waiting time and the random backoff period, the performance of real-time flows will be degraded greatly. In order to support real-time traffic, an efficient adaptive packet scheduling (APS) scheme is proposed, which aims to improve the system performance by guaranteeing inter-class, intra-class service differentiation and adaptively adjusting the packet length. APS classifies incoming packets by the IEEE 802.11e access class and then queued into a suitable buffer queue. APS employs strict priority service discipline for resource allocation among different service classes to achieve inter-class fairness. By estimating the received signal to interference plus noise ratio (SINR) per bit and current link condition, APS is able to calculate the optimized packet length with bi-dimensional markov MAC model to improve system performance. To achieve the fairness of intra-class, APS also takes maximum tolerable packet delay, transmission requests, and average allocation transmission into consideration to allocate transmission opportunity to the corresponding traffic. Detailed simulation results and comparison with IEEE 802.11e enhanced distributed channel access (EDCA) scheme show that the proposed APS scheme is able to effectively provide inter-class and intra-class differentiate services and improve QoS for real-time traffic in terms of throughput, end-to-end delay, packet loss rate and fairness.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권6호
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• pp.1800-1817
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• 2022

With the development of the economy and the improvement of living standards, the hot issues in the subject area have become the main research direction, and the mining of the hot issues in the subject currently has problems such as a large amount of data and a complex algorithm structure. Therefore, in response to this problem, this study proposes a method for extracting hot keywords in scientific journals based on the improved BERT model.It can also provide reference for researchers,and the research method improves the overall similarity measure of the ensemble,introducing compound keyword word density, combining word segmentation, word sense set distance, and density clustering to construct an improved BERT framework, establish a composite keyword heat analysis model based on I-BERT framework.Taking the 14420 articles published in 21 kinds of social science management periodicals collected by CNKI(China National Knowledge Infrastructure) in 2017-2019 as the experimental data, the superiority of the proposed method is verified by the data of word spacing, class spacing, extraction accuracy and recall of hot keywords. In the experimental process of this research, it can be found that the method proposed in this paper has a higher accuracy than other methods in extracting hot keywords, which can ensure the timeliness and accuracy of scientific journals in capturing hot topics in the discipline, and finally pass Use information technology to master popular key words.

• Smart Structures and Systems
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• 제30권3호
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• pp.333-338
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• 2022

Planning activity is complex process assuming the term "complexity" as a group of elements interconnected each other. The common knowledge about city planning underlines its main aim as: figuring the present, imaging the future, governing every day the territory and the way people use and live it at different scales. When considering the strength of technological opportunities and the spreading of ICT and IoT devices within everyday life, that mean within the life of cities, the complex nature of the urban system increases with the intensification of information and their connections. Recent orientations about urban and regional planning try to carry the discipline to a more flexible approach in respect to the hyperdeterminant role of direct technical applications. This passage is a fundamental aspect considering the faster and faster modifications of social and economic assets at the global and local scale. At the same time, the "environment question" became more and more relevant at the worldwide scale within the 2015 UN 2030 Agenda for Sustainable Development. Another relevant aspect about the recent urban planning orientations regards the role of the different subjects that are part of the planning process. Approaching the government of smart cities means to define how every subject, with different roles (public or private), could enrich the knowledge of the functioning of the "urban machine" and the awareness of participation of people and city users in the quality of urban life. In the paper author starts defining recent approaches in urban planning, then the nature of the city as a complex system is analyzed from the point of view of planners and of the different subjects that act in the city. Then the smart city is introduced as a further level of complexity and finally author propose the basic element of a Planning Support System.

• 한국정보통신학회논문지
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• 제16권4호
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• pp.835-842
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• 2012

운영체제는 추상적 개념과 기법들을 다루는 교과목이지만, 대부분 교재 위주의 이론 수업으로 진행되어 왔다. 이론 수업은 강의 내용에 대한 이해와 집중력 저하를 유발하므로 내용의 이해를 돕고 흥미를 유발하는 교육용 도구의 활용이 시도되었다. 본 논문에서는 CPU 스케줄링 알고리즘들의 동작을 시각적으로 보여주는 교육용 시뮬레이터를 설계하고 구현하였다. 구현된 시뮬레이터를 수업에 활용한 후 2010학년도와 2011학년도 수강생들의 학업 성취도를 측정하고 t-검증을 통해 두 집단의 CPU 스케줄링 알고리즘에 대한 시험문제 정답률 차이가 유의함을 밝혔다. 또한 시뮬레이터 활용에 대한 만족도와 관련분야 지식 습득에 대한 기여도 설문조사를 통해 시뮬레이터가 교과목에 대한 흥미를 유발하고 학습 내용에 대한 이해도를 증진시키는 교육용 도구로 유용하며, 이러한 수업 방식이 문제 해결능력 배양에 효과적임을 확인할 수 있었다.

• 한국정보통신학회논문지
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• 제19권7호
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• pp.1653-1659
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• 2015

운영체제는 추상적 개념과 기법들을 다루고 있지만, 대부분 이론 수업 위주로 진행되고 있다. 이론 수업은 강의 내용에 대한 이해와 집중력 저하를 유발하므로 학습 내용의 이해를 돕고 흥미를 유발하는 다양한 방법들이 시도되었다. 본 논문에서는 CPU 스케줄링 알고리즘들의 이해를 돕기 위해 학습자가 언제, 어디서나 웹 브라우저나 스마트폰을 사용하여 다양한 상황을 설정하고 알고리즘의 스케줄링 과정을 모의 실험해 볼 수 있는 웹 기반의 교육용 CPU 스케줄링 시뮬레이터를 설계하고 구현하였다. 구현된 시뮬레이터를 수업에 활용한 후 2014학년도 수강생들을 대상으로 구현된 시뮬레이터의 사용 편의성과 유용성에 대한 만족도 설문조사를 통해 시뮬레이터가 학습 내용에 대한 이해도 증진과 문제해결 능력을 배양하는 교육용 도구로 유용함을 확인할 수 있었다.

• 한국컴퓨터정보학회논문지
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• 제29권6호
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• pp.183-192
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• 2024

본 연구는 가상의류를 키워드로 하여 국내에서 이루어지고 있는 가상의류 관련 연구를 수집한 후, 가상의류 분야의 연구시기, 내용, 방법 등 연구 동향을 파악하고자 하였다. 이를 통해 향후 가상의류 관련 연구의 진행 방향을 제시하고자 하였다. 가상의류 관련 학술지와 학위논문의 학문분야를 분석한 결과, 패션 분야가 가장 많고, 다음으로 자연과학 분야, 예술 분야의 순으로 나타났다. 가상의류 관련 연구의 연도별 분포는 2000년 이후 점차 증가하다가 2016년에서 2020년 사이 감소하고, 코로나 펜데믹 이후 증가하는 경향을 나타냈다. 가상의류 연구내용은 마케팅이 가장 많고, 다음으로 가상착의, 디자인, 소재, 시스템 등이 있었다. 가상의류 관련 연구방법은 실험 연구가 가장 많고 다음으로 조사연구, 개발 연구의 순이었다. 향후 패션 관련 시스템 개발 연구, 가상 의류의 실효성 검증에 관한 연구가 진행되어야 할 것으로 생각된다. 또, 국외의 가상의류 연구 동향에 대한 분석이 필요할 것으로 사료된다.

• 한국도서관정보학회지
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• 제25권
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• pp.109-141
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• 1996

This research pertains to the interpretation of the many characteristics of the growing process of Library and Information Science in Korea with respect to its connection with discussion of the system of discipline. The result of the research are as follows. The Library and Information Science in Korea has gone through three distinct stages. The first stage spans the period from the late 50s to the 1960s during which three was an attempt to establish a relatively independent system of scholarship of Library and Information Science, although it was still heavily reliant on scholarship from Japan and the United States. The main characteristics of this first period is, firstly, that there a n.0, ppeared, for the first time, an awareness of a need to escape the attitude of foreign-orientation and to develop our own scholarship. Secondly, an effort was made to constitute the scholarship as a science (social science). Thirdly, there began a faint effort to import and a n.0, pply Information Science. The second stage covers the period between the 70s and the 80s, and saw the induction of Information Science begin in earnest and become the subject of education and research. The period was also marked by exploration of an alternative term to "Library Science", which was at the time being used. In addition, the period was a time of confusion for the examination of scholarship due to the induction of the new field of Information Science to what had already been a fragile structure of scholarship. This phenomenon served to intensify the doubts which had surfaced about existing term of Library Science, and ultimately played a large role in the a n.0, ppearance of the new term of Library and Information Science. Of course, there were a number of reasons which had made the change of term difficult, but it and be seen that the term change began in earnest after the change was adopted in the names of the university departments associated with the field in the late 80s. The third stage covers the period after the begining of the 90s. This stage saw the prominence of criticism and self-examination of the existing distorted foundational structure of Library and Information Sciences in Korea at the time, and, at the same time, a new methodology or research paradigms were advocated. It was a presenation of a new way of achieving a "Korean Library and Information Science" in order to understand and overcome not only the problems within the Korean libraries, but also within Library and Information Science in Korea. This caused repercussions to be felt not only among academics, but also among those actually working within the library systems. It moved academics toward a more practical scholarship, it inspired the prominence of a new scholarly methodology called a reform in academic writing, and even influenced specific research activities.research activities.

• 한국콘텐츠학회논문지
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• 제17권3호
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• pp.100-114
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• 2017

대부분의 연구자들은 새로운 분야의 연구를 수행하기 위해 전문가에게 자문을 받거나 전문가의 논문들을 기반으로 연구 방향을 설정한다. 기존의 학술 검색 서비스에서는 분야별 논문 정보는 제공하지만 각 분야의 전문가를 제공해주지 않기 때문에 사용자들이 검색된 논문을 기반으로 전문가를 직접 판단해야 한다. 본 논문에서는 학회에 발간된 논문 정보를 기반으로 빅 데이터 처리를 이용한 학문 분야별 전문가검색 시스템을 설계하고 구현한다. 제안하는 시스템은 대량의 논문을 저장하고 관리하기 위해 빅 데이터분산 저장 기술을 활용하였다. 또한 빅 데이터 분산 처리기술을 활용하여 전문가를 판별하고 전문가와 연관 되는 정보를 분석한다. 분산처리 된 결과는 사용자가 전문가 검색 요청 시 웹페이지를 통해 보여준다. 사용자는 제안하는 시스템을 통해 해당 연구 분야의 전문가를 추천받음으로써 연구를 수행함에 있어 많은 도움을 받을 수 있다.

• 무역상무연구
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• 제37권
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• pp.277-327
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• 2008

This paper is to provide for an analysis on the trade adjustment assistance program and the Case study affected by international trade and FTA. The paper offers a legal study on analysis about Korea's Trade Adjustment Assistance Law for the Manufacturing Industries, USA's TAA. and Japan's law for Industry revival. In general, USA's TAA measures are defined as assistance actions for business enterprises, farmers and manufacturing industries workers. We exclude farmers and fishermen under Korea's Trade Adjustment Assistance Law for the Manufacturing Industries's business enterprises and workers, but we give them the systemic supports under korea's special assistance law for the farmers and fishermen and so on after FTA. Especially this focuses on the trade adjustment assistance case about both Korea's agriculture-farmer assistance from FTA and USA's TAA from workers in layoffs of trade-impacted communities. Korea has provided TAA to the sphere of agriculture after special legislation in Korea-Chile helping closed orchard, modernizing high quality producing facility for agriculture competition, producing superior fruit saplings, and constructing the distribution center in the producing district. But for US-Korea FTA and rapid increase of import by FTA expansion, we must prepare such indemnity systems for loss as cash benefit and wider aids for closed farm. The USA's TAA program targets manufacturing workers affected by international trade, who may have fewer transferable skills and face greater challenges to reemployment than other dislocated workers. A large majority sought some assistance from their one-stop center. Relatively small numbers chose to enroll in training, but those who did it often used this opportunity to chart a new career path. Finally, we learned the importance of education and discipline from USA cases. The fast and accurate information providing can raise efficiencies. The infrastructure can maximize the effect of TAA. The effective application would help us get over difficulties of TAA at hand.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2004년도 대한지구물리학회.한국지구물리탐사학회 공동학술대회 초록집
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• pp.3-17
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• 2004

Space-borne Earth observation technique is one of the most cost effective and rapidly advancing Earth science research tools today and the potential field and micro-wave radar applications have been leading the discipline. The traditional optical imaging systems including the well known Landsat, NOAA - AVHRR, SPOT, and IKONOS have steadily improved spatial imaging resolution but increasing cloud covers have the major deterrent. The new Earth observation satellites ENVISAT (launched on March 1 2002, specifically for Earth environment observation), ALOS (planned for launching in 2004 - 2005 period and ALOS stands for Advanced Land Observation Satellite), and RADARSAT-II (planned for launching in 2005) all have synthetic aperture radar (SAR) onboard, which all have partial or fully polarimetric imaging capabilities. These new types of polarimetric imaging radars with repeat orbit interferometric capabilities are opening up completely new possibilities in Earth system science research, in addition to the radar altimeter and scatterometer. The main advantage of a SAR system is the all weather imaging capability without Sun light and the newly developed interferometric capabilities, utilizing the phase information in SAR data further extends the observation capabilities of directional surface covers and neotectonic surface displacements. In addition, if one can utilize the newly available multiple frequency polarimetric information, the new generation of space-borne SAR systems is the future research tool for Earth observation and global environmental change monitoring. The potential field strength decreases as a function of the inverse square of the distance between the source and the observation point and geophysicists have traditionally been reluctant to make the potential field observation from any space-borne platforms. However, there have recently been a number of potential field missions such as ASTRID-2, Orsted, CHAMP, GRACE, GOCE. Of course these satellite sensors are most effective for low spatial resolution applications. For similar objects, AMPERE and NPOESS are being planned by the United States and France. The Earth science disciplines which utilize space-borne platforms most are the astronomy and atmospheric science. However in this talk we will focus our discussion on the solid Earth and physical oceanographic applications. The geodynamic applications actively being investigated from various space-borne platforms geological mapping, earthquake and volcano .elated tectonic deformation, generation of p.ecise digital elevation model (DEM), development of multi-temporal differential cross-track SAR interferometry, sea surface wind measurement, tidal flat geomorphology, sea surface wave dynamics, internal waves and high latitude cryogenics including sea ice problems.