• 로봇학회논문지
• /
• 제17권3호
• /
• pp.353-358
• /
• 2022

Due to the limited field of view of the pinhole camera, there is a lack of stability and accuracy in camera pose estimation applications such as visual SLAM. Nowadays, multiple-camera setups and large field of cameras are used to solve such issues. However, a multiple-camera system increases the computation complexity of the algorithm. Therefore, in multiple camera-assisted visual simultaneous localization and mapping (vSLAM) the multi-view tracking algorithm is proposed that can be used to balance the budget of the features in tracking and local mapping. The proposed algorithm is based on PanoSLAM architecture with a panoramic camera model. To avoid the scale issue 3D LiDAR is fused with omnidirectional camera setup. The depth is directly estimated from 3D LiDAR and the remaining features are triangulated from pose information. To validate the method, we collected a dataset from the outdoor environment and performed extensive experiments. The accuracy was measured by the absolute trajectory error which shows comparable robustness in various environments.

• 전자통신동향분석
• /
• 제37권4호
• /
• pp.46-59
• /
• 2022

The 5G MEC (Multi-access Edge Computing) technology offers network and computing functionalities that allow application services to improve in terms of network delay, bandwidth, and security, by locating the application servers closer to the users at the edge nodes within the 5G network. To offer its interoperability within various networks and user equipment, standardization of the 5G MEC technology has been advanced in ETSI, 3GPP, and ITU-T, primarily for the MEC platform, transport support, and MEC federation. This article offers a brief review of the standardization activities for 5G MEC technology and the details about the system architecture and functionalities developed accordingly.

• 교육시설
• /
• 제4권2호
• /
• pp.31-36
• /
• 1997

The Magnet Methodology is not the recording of knowledge, skills, techniques, and other information from the past, but creating a knowledge base using present issues of problems for students' and teachers' life-span development through the exploration of career choices and development. In short, it is the multi-cooperative information system for commensalism. It is the magnet program that connects various level of educational institutions under a certain theme and enables students to choose on their own. And this magnet program is being adminstered by the magnet school. And some regular schools provide magnet program as vocational educations and extra-curricular activities. Magnet program reflects the concept of desegregation which was proposed by the U.S. Federal Court decision against the racial conflict which had culminated in the 60s and 70s. Magnet program enables students to choose their own programs and schools, and gives teachers and students the opportunities to develop their teaching method and learning method. That's why magnet program is called continuous, future-oriented one. Teachers and students can also get fair judgement on their activities due to the voluntary magnet program. It mainly deals with practical issues, so it is very realistic to establish the multi cooperative information system including companies, homes, communities, or governments under these practical issues. The openness of magnet program is guaranteed not only by the characteristics of the program but also by the physical layout of the magnet schools. There are no doors and walls, and classrooms are facing one another and sharing all the opinions and information. This precisely corresponds to the concept of co-existence of eco-system and the interdisciplinary approach which is essential to solve our problems.

• 가족자원경영과 정책
• /
• 제25권4호
• /
• pp.87-99
• /
• 2021

본 연구는 과거 혼인경험과 관계없이 중년 무배우남성을 1인가구와 다인가구로 구분하여 인적자본과 사회자본의 차이를 살펴보고 생활만족도에 영향을 미치는 효과를 비교하였다. 제13차년도 한국복지패널조사(2018)를 사용하여 중년 무배우남성을 연구대상으로 분석하였다. 주요 분석결과는 다음과 같다. 첫째, 중년 무배우남성 1인가구는 이들의 혼인상태와 관계없이 교육수준, 경제활동상태, 인터넷사용 등 인적자본 수준은 다인가구보다 낮았다. 둘째, 중년 무배우남성의 가구주 여부에 따른 인적자본과 사회자본 수준의 차이를 보면, 이혼·사별 경험이 있는 다인가구인 비가구주 중년남성은 1인가구에 비해 사회자본의 수준이 현저히 낮았다. 미혼의 경우, 1인가구에 비해 비가구주 중년남성의 미취업 비율은 높고 상용근로 비율은 낮았다. 셋째, 혼인상태에 따른 중년 무배우남성의 생활만족도에 미치는 인적자본과 사회자본의 효과를 분석한 결과, 인적자본변수 중 경제활동상태는 이혼·사별집단에서 1인가구와 다인가구에 공통으로 영향을 주었다. 사회자본의 효과를 보면 미혼집단에서 1인가구와 다인가구 모두 유대수준이 높을수록, 다인가구에서 신뢰가 높은 집단이 신뢰가 낮은 집단에 비해 생활만족도에 긍정적 효과를 주었다. 이혼·사별집단에서는 1인가구에서 자원봉사참여가, 다인가구에서는 신뢰가 생활만족도에 유의한 사회자본 변수로 나타났다. 최근 한국사회에서 1인가구를 대상으로 하는 특화된 프로그램이 건강가정지원센터를 비롯한 지역사회에서 강화되고 있는데, 향후 중년 대상 프로그램의 경우에는 1인가구라는 가구의 형태보다 오히려 이용자 요구에 초점을 맞추어 1인가구로 한정하지 않는 것이 다인가구임에도 소외되기 쉬운 중년 무배우남성의 정책접근성을 높일 것으로 기대된다.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
• /
• pp.663-663
• /
• 2002

The National Oceanographic Research Institute of KOREA started to survey for the basic data necessary to territorial sea and EEZ identification and marine development with Multi-Beam Echo Sounder(L3 SeaBeam 2112) since 1996. The Multi-Beam surveys has provided a very new and precise way of describing the morphology and nature of the underwater seabed. Multi-Beam Echo Sounder systems employ sound waves propagating at angles which vary from vertical to nearly horizontal. The locations on the bottom where echoes are generated cover a swath whose port to starboard width may be equal to many times the water depth. Newer Multi-beam bathymetric sonars provide both a beam by beam depth and backscatter amplitude of the bottom. But The backscattered amplitude didn't use for identification of bottom properties because backscatter amplitude effects by the many environmental variables of underwater and seabed. We investigates the utilization of geo-referenced backscatter amplitude and analysis of relationship between The Backscattered Amplitude and Sidescan Sonar imagery from Sea Beam 2112. For the backscattered amplitude imagery mainly represents the properties of sediment, we computed the beam geometry, time-varied amplifier gain, and mainly incidence angle to the topography using bathymetric model at each ping. In this paper, those issues are illustrated, and the angular independent imagery based on swath topographic model is described.

• 한국통신학회논문지
• /
• 제27권8C호
• /
• pp.729-740
• /
• 2002

본 논문에서는 광 인터넷 망의 가상망 재구성을 위하여 최적의 망 재구성 정책을 고려한 보상-비용 함수를 최대화하는 다단계 결정 문제로 정의 하였다. 그리고 트래픽 요구사항을 만족하기 위해서 노드 교환 기법에 근거한 새로운 휴리스틱 알고리즘을 제안하였다. 또한 트래픽 예측 기법을 사용하여 휴리스틱 알고리즘에 의해 발생하는 근사 문제를 해결 하고, 이를 바탕으로 트래픽 예측 다단계 재구성 정책을 제안하였다. 실험결과 다단계 재구성 정책은 물리적 자원이 제한된 환경에서 기존의 방법에 비해 뛰어난 성능을 보였다.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2019년도 학술발표회
• /
• pp.161-161
• /
• 2019

Water security issues, stimulated by increasing population and changing climate, are growing and pausing major challenges for water resources managers around the world. Proper utilization, management and distribution of all available water resources is key to sustainable development for achieving water security To alleviate the water shortage, most of the current research on multi-sources combined water supplies depends on an overall generalization of regional water supply systems, which are seldom broken down into the detail required to address specific research objectives. This paper proposes the concept of optimization framework on multi water sources selection. A multi-objective water allocation model with four objective functions is introduced in this paper. Harmony search algorithm is employed to solve the applied model. The objective functions addresses the economic, environmental, and social factors that must be considered for achieving a sustainable water allocation to solve the issue of water security.

• International Journal of Computer Science & Network Security
• /
• 제21권3호
• /
• pp.212-218
• /
• 2021

Low-power and Lossy Networks (LLNs) have become the common network infrastructure for a wide scope of Internet of Things (IoT) applications. For efficient routing in LLNs, IETF provides a standard solution, namely the IPv6 Routing Protocol for LLNs (RPL). It enables effective interconnectivity with IP networks and flexibly can meet the different application requirements of IoT deployments. However, it still suffers from different open issues, particularly in large-scale setups. These include the node unreachability problem which leads to increasing routing losses at RPL sink nodes. It is a result of the event of memory overflow at LLNs devices due to their limited hardware capabilities. Although this can be alleviated by the establishment of multi-sink topologies, RPL still lacks the support for effective load balancing among multiple sinks. In this paper, we address the need for an efficient multi-sink load balancing solution to enhance the performance of PRL in large-scale scenarios and alleviate the node unreachability problem. We propose a new RPL objective function, Multi-Sink Load Balancing Objective Function (MSLBOF), and introduce the Memory Utilization metrics. MSLBOF enables each RPL node to perform optimal sink selection in a way that insure better memory utilization and effective load balancing. Evaluation results demonstrate the efficiency of MSLBOF in decreasing packet loss and enhancing network stability, compared to MRHOF in standard RPL.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2022년도 추계학술발표대회
• /
• pp.308-310
• /
• 2022

With the rise of the Al wave, task-oriented dialogue systems have become one of the popular research directions in academia and industry. Currently, task-oriented dialogue systems mainly adopt pipelined form, which mainly includes natural language understanding, dialogue state decision making, dialogue state tracking and natural language generation. However, pipelining is prone to error propagation, so many task-oriented dialogue systems in the market are only for single-round dialogues. Usually single- domain dialogues have relatively accurate semantic understanding, while they tend to perform poorly on multi-domain, multi-round dialogue datasets. To solve these issues, we developed a paddle-based multi-domain task-oriented Chinese dialogue system. It is based on NEZHA-base pre-training model and CrossWOZ dataset, and uses intention recognition module, dichotomous slot recognition module and NER recognition module to do DST and generate replies based on rules. Experiments show that the dialogue system not only makes good use of the context, but also effectively addresses long-term dependencies. In our approach, the DST of dialogue tracking state is improved, and our DST can identify multiple slotted key-value pairs involved in the discourse, which eliminates the need for manual tagging and thus greatly saves manpower.

• 디지털융복합연구
• /
• 제15권10호
• /
• pp.253-260
• /
• 2017

다중서버 환경에서 인가된 사용자만이 서버의 데이터와 서비스들을 이용할 수 있어야 함으로 인증된 키 동의는 보안 이슈들 중에서 가장 중요한 문제 중 하나이다. 이러한 보안 이슈를 지원하기 위해서 다양한 기법들이 최근 몇 년간 제안되었다. 특히, 최근에 Shin은 기존 기법의 보안 문제점을 도출하고 이를 해결할 수 있는 개선된 기법인 SIAKAS를 제안하였다. 본 논문에서는 SIAKAS가 여전히 응용서버 가장 공격에 취약하고 추적성을 제공하는 문제가 있음을 보이고, 이러한 문제들을 해결할 수 있는 비추적성을 제공하는 인증된 키 동의 기법인 UAKAS를 제안한다. UAKAS는 SIAKAS 및 관련된 기법들의 보안 및 프라이버시 문제를 해결하고 이들에 비해서 최소 12%의 연산 오버헤드를 줄일 수 있는 장점이 있다.