• Title, Summary, Keyword: RCS

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A Software Framework Design for Providing Presence Information of SMS Users to RCS-e App (RCS-e 앱 사용 시 SMS 사용자 프레즌스 정보 제공을 위한 소프트웨어 프레임워크 설계)

  • Lee, Dongcheul
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.14 no.5
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    • pp.145-151
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    • 2014
  • If RCS-e subscribers and SMS subscribers want to exchange instant messages between each other, RCS-e app should know the presence information of the SMS subscribers. However, a RCS-e specification does not have the way to identify the information. This paper propose a software framework that makes RCS-e app can identify the information without having to modify RCS-e app. It describes the call flows between network equipments to manage the information. Also, it defines RCS-e service tags and service tuple for SMS subscribers. Performance evaluation proves that the proposed framework does not add loads to the existing network.

A Study on the Recent Analysis Method for the RCS Reduction for Naval Ships (함정 RCS 저감 설계를 위한 최신 분석기법 연구)

  • Ahn, Byung-Jun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.3
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    • pp.333-338
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    • 2014
  • In this paper, we researched the recent analysis method of RCS prediction for the naval ship and compared the new method with conventional one in respect of the effectiveness to improve a naval ship with low RCS. This paper included the process of analyzing RCS characteristics for naval ship using the numerical method and finding the hotspot by hourglass plot, ISAR image and etc.. Also we introduced the various design methods in order to reduce RCS.

A Web-based Open API Framework for RCS-e Session Establishment (RCS-e 세션 수립을 위한 웹 기반 오픈 API 프레임워크)

  • Lee, Dongcheul
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.15 no.5
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    • pp.125-131
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    • 2015
  • In order to vitalize the Rich Communication Service-e(RCS-e) service, RCS-e users need various ways to use RCS including RCS-e apps. A RCS standards organization has suggested Application Program Interface(API). Since it only dealt with functional requirements, it was not enough to implement the API. This paper suggests an open API framework that can utilize RCS-e through a web interface. By using the framework, web developers can implement various RCS-e-enabled web applications. A system architecture is defined for the framework. Call flows for establishing a RCS-e session between the framework and other nodes are defined. Also, rules and examples for translating protocols between them are provided. Finally, performance evaluation proves that the proposed framework does not add loads to the existing network infrastructure.

Performance Comparison for Radar Target Classification of Monostatic RCS and Bistatic RCS (모노스태틱 RCS와 바이스태틱 RCS의 표적 구분 성능 분석)

  • Lee, Sung-Jun;Choi, In-Sik
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.12
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    • pp.1460-1466
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    • 2010
  • In this paper, we analyzed the performance of radar target classification using the monostatic and bistatic radar cross section(RCS) for four different wire targets. Short time Fourier transform(STFT) and continuous wavelet transform (CWT) were used for feature extraction from the monostatic RCS and the bistatic RCS of each target, and a multi-layered perceptron(MLP) neural network was used as a classifier. Results show that CWT yields better performance than STFT for both the monostatic RCS and the bistatic RCS. And, when STFT was used, the performance of the bistatic RCS was slightly better than that of the monostatic RCS. However, when CWT was used, the performance of the monostatic RCS was slightly better than that of the bistatic RCS. Resultingly, it is proven that bistatic RCS is a good cadndidate for application to radar target classification in combination with a monostatic RCS.

WebRSF: A Web-based Rich Communication Service Software Framework for Providing the 1-to-1 Chat Service (WebRSF: 1대 1 대화 서비스 제공을 위한 웹 기반 리치 커뮤니케이션 서비스 소프트웨어 프레임워크)

  • Lee, Dongcheul
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.17 no.6
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    • pp.113-119
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    • 2017
  • The Rich Communication Service(RCS) is a next generation mobile messaging service. Since it has been developed and managed by a wireless service provider, 3rd party application developers cannot utilize the RCS features in their apps. A few studies have been proposed to solve this problem, even though they were not viable level of deployment. This paper presents a Web-based Rich Communication Service Software Framework(WebRSF) to help the 3rd party application developers adopt RCS features easily. WebRSF converts complicated RCS protocols to simple web-based protocols for providing the RCS 1-to-1 chat service to the 3rd parties. Communication protocols between WebRSF and its clients are defined in this paper. Also, a network configuration diagram and a message flow diagram are defined. Finally, performance evaluation between the WebRSF client and the RCS client are performed to simulate the load on clients' devices. It shows that the WebRSF client has 17% less loads than the RCS client while initiating sessions, and has 25% more loads after initiating sessions.

Comparative Analysis of Effective RCS Prediction Methods for Chaff Clouds (효과적인 채프 구름의 RCS 예측 방법 비교 분석 연구)

  • Kim, Min;Lee, Myung-Jun;Lee, Seong-Hyeon;Park, Sung-ho;Kong, Young-Joo;Woo, Seon-Keol;Kim, Hong-Rak;Kim, Kyung-Tae
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.29 no.3
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    • pp.233-240
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    • 2018
  • Radar cross section (RCS) analysis of chaff clouds is essential for the accurate detection and tracking of missile targets using radar. For this purpose, we compare the performance of two existing methods of predicting RCS of chaff clouds. One method involves summing up the RCS values of individual chaffs in a cloud, while the other method predicts the RCS values using aerodynamic models based on the probability density function. In order to compare and analyze the two techniques more precisely, the RCS of a single chaff computer-aided design model consisting of a half wavelength dipole was calculated using the commercial electromagnetic numerical analysis software, FEKO 7.0, to estimate the RCS values of chaff clouds via simulation. Thus, we verified that our method using the probability density distribution model is capable of analyzing the RCS of chaff clouds more efficiently.

A RCS investigation of Multiple Chaff clouds using Probability Distribution Characteristics (확률분포를 이용한 다중 채프의 RCS 특성 분석)

  • Chae, Gyoo-Soo;Lim, Joong-Soo;Kim, Young-Ho
    • Journal of Convergence for Information Technology
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    • v.7 no.2
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    • pp.37-42
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    • 2017
  • In order to estimate chaff RCS, we suggest here a novel method using the probability distribution. Normally, a chaff is assumed that it is a thin dipole antenna and the RCS can be calculated by the scattering wave theory. Most of the theoretical methods presented were mainly focusing on a single chaff cloud. In this paper, the RCS calculation was done for two or more chaff clouds and the changes of RCS with azimuth angle were observed. Matlab was used for presenting the probability distribution of chaff clouds and RCS calculation. A more accurate RCS estimation method is suggested by estimating the number of chaffs except the blocked elements.

A Study on the Solutions of Guided Missile Attacks using 3-D RCS Data of Maritime Ship (함정의 3차원 RCS 측정 데이터를 활용한 유도탄 대응 기법 연구)

  • Gwak, Sang-Yell
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.4
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    • pp.552-557
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    • 2020
  • The Radar Cross Section (RCS) is a virtual region indicating the strength of a wavelength at which a radar signal is reflected and received. As the ship's RCS represents its own stealth performance and survivability, efforts have been made in various areas from design to construction to reduce the RCS. The RCS can be predicted using design drawings and CAD models, but it is necessary to measure the RCS at sea since sea clutter and multipath reflections occur in the sea environment. However, such RCS predictions and measured values provide only a simple relative magnitude to the user, and there has not been much research on this topic. In this paper, a missile countermeasure technique was studied using 3D RCS measurement data in an operating environment. The elevation and azimuth angle of the ship viewed from the missile were estimated using the location information of the missile, and the RCS value was inverted by mapping it to previously measured 3D RCS measurement data. In addition, by using the movement information of the missile, the RCS observed by the missile could be predicted in advance, and this method can be used to propose a response plan based on the maneuvering and chaff system.

RCS Prediction of Complex Targets (복합구조물의 RCS 예측)

  • 석성하;서태일;전상미;박해상;김효태
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.11 no.6
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    • pp.929-938
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    • 2000
  • A summary of the development and verifications of a computer code being developed at Pohang University of Science and Technology (POSTECH) for calculating the radar cross section(RCS) of complex targets is presented. The complex targets are modeled in terms of patches and wedges. This code utilizes physical optics, physical theory of diffraction and shooting and bouncing rays method to calculate the RCS of complex targets. For the verification of the RCS prediction code, a simple-shaped scale-model was manufactured and the RCS was measured at the POSTECH compact range. The obtained RCS was processed to give frequency-domain RCS patterns and ISAR images. The predicted RCS shows good agreement with measured one. The RCS prediction methods presented here are applicable to stealth design and target recognition.

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Analysis and Measurement of RCS for UHF Band RFID Tag Antennas (UHF 대역 RFID 태그 안테나의 RCS(Radar Cross Sections) 분석 및 측정)

  • Moon, Hyo-Sang;Kim, Nam-Hoon;Lee, Jong-Wook;Lee, Bom-Son
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.1
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    • pp.31-36
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    • 2007
  • In the RFID system, one of the important criteria of tag antenna performance is the detection distance. The most important factor determining the detection distance of the tag antenna is the Radar Cross Sections(RCS). In this paper, we propose a method to simply measure the RCS of the RFID tag antenna using two reader antennas(Tx and Rx) and a network analyzer. We estimate RCS' from the RCS equation based on the measured $S_{21}$ using the network analyzer. We compare the measured $S_{21}$ values with the calculated $S_{21}$ values and the simulated $S_{21}$ values using EM simulator. The used tag antennas are two kinds of dipole-type, metal-type, and an inductively-coupled type ones. In case of the dipole type, the measured, simulated and calculated values of the RCS are almost the same. In case of other types, we obtain the measured RCS values with a difference of about 3 dB.