• Journal of electromagnetic engineering and science
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• 제13권3호
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• pp.151-157
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• 2013

Marine radars are affected by sea and rain clutters, which can make target discrimination difficult. The clutter standard deviation and improvement factor are applied using multiple parameters-moving speed of radar, antenna speed, angle, etc. When a radar signal is processed, a Data Matrix Bank (DMB) filter can be applied to remove sea clutters. This filter allows detection of a target, and since it is not affected by changes in adjacent clutters resulting from a multi- target signal, sea state clutters can be removed. In this paper, we study the level for clutter removal and the method for target detection. In addition, we design a signal processing algorithm for marine radars, analyze the performance of the DMB filter algorithm, and provide a DMB filter algorithm design. We also perform a DMB filter algorithm analysis and simulation, and then apply this to the DMB filter and cell-average constant false alarm rate design to show comparative results.

• 정보통신설비학회논문지
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• 제10권3호
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• pp.103-109
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• 2011

With the growing popularity of digital video applications, those areas of the efficient transmit, storage management, and search technology for video data are emerging as an important core technology. To be an effective video indexing system, users need to be able to find the video segments that they want. Unfortunately, video data is difficult to manage because of its unstructured data type and large volume with linear forms. This paper proposes a shot verification using visual rhythm and video retrieval system. The shot verification is designed to detect a segment from video easily and quickly, known as shot boundaries, just by changing the visual rhythm without playing the image. Therefore, this can decrease the false detected shots and generate the unidentified shots and key frames. The retrieval system is constructed in terms of visual descriptor from the list of MPEG-7. The effectiveness of the proposed shot verification process and video retrieval system is demonstrated.

• 정보통신설비학회논문지
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• 제10권3호
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• pp.98-102
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• 2011

This paper proposes a method of a touch-based remote control and sensor information acquisition of a mobile robot using a smart phone. An application in a smart phone processes the acquired sensor information and conducts autonomous navigation. By touching the screen of the smart phone, a series of points obtained from designated curve traces are analyzed and provide control of a robot. This study develops a mobile application that acquires and handles data from a mobile robot and sends appropriate action commands through remote control using Bluetooth communication with a smart phone. The utility and performance of the proposed control scheme have been successfully verified through experimental tasks using an actual smart phone and a mobile robot.

• 정보통신설비학회논문지
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• 제9권2호
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• pp.48-55
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• 2010

This paper proposes a realtime tracking algorithm of mobile object in indoor or outdoor environment. For this purpose the proposed system selects location data closer to mobile objects in real time using Triangulation method and DCM (Database Correlation Method). Also, this system utilizes the adjusted location data selected by using Kalman filter to improve the location accuracy of transfer object. Be studied in existing the Kalman filter have unstable location data until its settlement because of it extracts current values by using the past the information. However, proposed location tracking system don't apply existent Kalman filter to this system and it permits precisional tracking location by using more effective methods.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권1호
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• pp.195-215
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• 2021

Multipath Transport Control Protocol (MPTCP) is a transport layer protocol that enables multiple TCP connections across various paths. Due to path heterogeneity, it incurs more energy in a multipath wireless network. Recent work presents a set of approaches described in the literature to support systems for energy consumption in terms of their performance, objectives and address issues based on their design goals. The existing solutions mainly focused on the primary system model but did not discourse the overall system performance. Therefore, this paper capitalized a novel stochastically multipath scheduling scheme for data and path capacity variations. The scheduling problem formulated over MPTCP as a stochastic optimization, whose objective is to maximize the average throughput, avoid network congestion, and makes the system more stable with greater energy efficiency. To design an online algorithm that solves the formulated problem over the time slots by considering its mindrift-plus penalty form. The proposed solution was examined under extensive simulations to evaluate the anticipated stochastic optimized MPTCP (so-MPTCP) outcome and compared it with the base MPTCP and the energy-efficient MPTCP (eMPTCP) protocols. Simulation results justify the proposed algorithm's credibility by achieving remarkable improvements, higher throughput, reduced energy costs, and lower-end to end delay.

• 한국산학기술학회논문지
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• 제21권11호
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• pp.1-8
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• 2020

최근 기하급수적인 인터넷 데이터의 증가로 딥러닝 등의 많은 분야가 발전하였지만 바이럴 마케팅(viral marketing)과 같은 상업적 목적의 광고가 발견되면서 정보증가의 부작용이 발생하고 있다. 이는 양질의 정보를 공유하고자 하는 인터넷의 본질을 훼손하고 있을 뿐만 아니라 사용자는 양질의 정보를 습득하기 위해 검색시간이 증가하는 문제가 야기된다. 이에 본 연구에서는 광고(Ad: Advertisement, 이하 Ad) 글을 정보 전달의 본질을 흐리는 내용의 글이라 정의하였으며 본 정의에 부합하는 정보로 필터링하는 모델을 제안하였다. 제안하는 모델은 광고 필터링 경로와 광고 필터링 성능 개선경로로 구성되었으며 지속적으로 성능이 개선되도록 설계하였다. 광고 글 필터링을 위해 데이터를 수집하고 KorBERT를 사용하여 문서분류를 학습하였다. 본 모델의 성능을 검증하기 위해 실험을 진행하였으며 5개의 주제를 통합한 데이터에 대한 정확도(Accuracy), 정밀도(Precision)는 각각 89.2%, 84.3%의 결과를 나타냈고 광고의 비정형적 특성을 고려하더라도 높은 성능이 보임을 확인하였다. 본 모델을 통해 바이럴 마케팅으로 구성된 문서에서 광고 문단을 판단하고 필터링하여 사용자에게 양질의 정보를 효과적으로 전달하며 검색하는 과정에서 낭비되는 시간과 피로가 감소할 것으로 기대된다.

• 한국광학회:학술대회논문집
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• 한국광학회 1997년도 Advance Program of 14th optics andquantum Electronics conference, 1997제14 회 광학 및 양자전자 학술 발표회 논문 요약집
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• pp.3-3
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• 1997

• 유통과학연구
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• 제18권5호
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• pp.15-23
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• 2020

Purpose: This research focused on the fact that the Internet platform is integral to IoT products such as Smart home and studied consumer buying decisions when products are sold bundled with internet service. Contrary to the sales strategies of telecommunication companies, some companies sell IoT products alone, for example Google, Kakao, and Naver. In this market situation, the sales strategies of Korean telecommunication companies were analyzed with bundling theory and technology acceptance model, then it was conducted to figure out which sales and distribution strategies could affect consumers' purchase behavior. Research design, data, methodology: Data was collected by149 questionnaires from groups who are familiar with IoT smart home systems, then exploratory factor analysis and regression were used to analyze the research model. Results: The results revealed that the perceived ease of use and the perceived usefulness affect the purchase intention of IoT-based products; however, this effect was not found in the case of bundled products. In other words, it is found that selling and distributing Internet services and IoT products together does not affect consumers' purchases. Conclusion: It is suggested that Korean telecommunications companies' existing sales and distribution strategies for IoT products need to be changed according to its characteristics.

• 정보통신설비학회논문지
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• 제3권1호
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• pp.88-101
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• 2004

The Third Generation (3G) cellular mobile communication systems aim at providing higher data rates, improved quality of service, support for multimedia applications and global roaming. Cdma2000 and Universal Mobile Telecommunication System (UMTS) have emerged as two leading 3G standards in USA and European countries, respectively. Both the standards are capable of delivering high bandwidth data, voice and multimedia services to users of mobile equipment, but are not directly interoperableand are not available across different geographic areas, due to which global roaming is not possible in true sense of using single mobile equipment. However, both UMTS and cdma2000 are based on wideband code division multiple access (WCDMA) as the access method. Due to this, there exist some inherent commonalities between them. In this paper we will try to exploit the commonalities between the two standards in order to design an ASIC, which can provide dual standard capability. This paper discusses the physical layer aspects of the two standards and proposes an approach to design an ASIC which can be mapped to baseband processing part of the physical layer and is capable of delivering for either of the two aforementioned standards.

• 대한전자공학회논문지
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• 제26권7호
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• pp.125-131
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• 1989

본 논문에서는 기존의 BTC 방법을 개선한 새로운 ABTC(adaptive block truncation coding) 방법을 제안하였다. ABTC 알고리듬은 화상데이터의 부분적인 특성에 따라 압축방식을 선택적으로 적용함으로써 높은 압축률로 우수한 화질의 재생화면을 얻을 수 있다. ABTC 화상압축방식은 압축 알고리듬이 간단하면서도 높은 압축률을 얻을 수 있는 특징이 있다. 이 알고리듬을 사용하면 칼라화상을 1.0(bit/pel)에서 2.26(bit/pel)의 데이터 부호율 범위내에서 임의로 코딩할 수 있으며 원래의 화상에 비해 화질의 큰 손상없이 높은 압축률 $1.3{\sim}1.5bit/pel$을 얻을 수 있다.