• 제목/요약/키워드: Millimeter wave (MMW)

검색결과 20건 처리시간 0.022초

The Biologic Effect of Millimeter Wave Irradiation Followed to Photodynamic Therapy on the Tumor

  • Ahn, Jin-Chul;Lee, Chang-Sook;Chang, So-Young;Yoon, Sung-Chul
    • 대한의생명과학회지
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    • 제17권1호
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    • pp.79-84
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    • 2011
  • Photodynamic therapy consists of a photosensitizer, suitable light source and oxygen. The excitation of the photosensitizer at a cancer mass results in oxidation which would ultimately reduce the mass via apoptosis. Millimeter wave (MMW) therapy has also been known to be effective on cancer cell mass reduction, human cell regeneration and immunity enhancement among the Russian clinicians and scientists. In the present study, the two modalities were combined to achieve synergistic effects while reducing the administration dosage of the photosensitizer, photogem, thus minimizing the side effects. The CT-26 adenocarcinoma cell mass was implanted on mice and the tumors were exposed to a simple MMW irradiation or a combined treatment of MMW and PDT. The treatments continued for 4 weeks and the size of the tumor was measured continuously. The significant therapeutic result of MMW was not found during 4 weeks, preferably more cancer recurrence possibility after MMW irradiation was observed. The results of this study suggest that the combination of MMW irradiation and photodynamic treatment should not be recommended. The result of the MMW treatment alone, however, displayed suppressive effect on cancer cell proliferation for both in vitro and in vivo. The results of the present study suggest that the millimeter wave therapy deserves a further study.

TEST MODEL OF MILLIMETER-WAVE IMAGING RADIOMETER EQUIPMENT (MIRAE)

  • Lee, Ho-Jin;Kim, Won-Gyum;Seong, Jin-Taek;Kim, Dae-Suk;Na, Kyoung-Tae;Jung, Min-Kyoo;Chang, Yu-Shin;Kim, Soon-Tae;Kim, Yong-Hoon
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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    • pp.365-368
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    • 2007
  • Millimeter-wave (MMW) imaging radiometer systems have an attractive advantage to obtain an image through low visibility weather conditions such as fog, clouds and light rain compared with visible and infrared imaging systems. Many countries have developed a various kinds of MMW imaging radiometers for the aim of low cost and high performance. In Korea, Millimeter-wave Imaging RAdiometer Equipment (MIRAE) has been developed since the end of 2006. Recently the development of some modules was finished for the test model. This paper describes the design and development of the MIRAE. In addition, the test results of its manufactured modules are presented.

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Preliminary Simulation on Spaceborne Sparse Array Millimeter Wave Radar for GMTI

  • Kang, Xueyan;Zhang, Yunhua
    • Journal of electromagnetic engineering and science
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    • 제10권4호
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    • pp.322-327
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    • 2010
  • Spaceborne sparse array radar for ground moving targets indication (GMTI) has outstanding advantage over full array radar for constructing ultra-large aperture. Rapid development of millimeter wave (MMW) technology make it possible for realizing MMW GMTI radar, which is much more sensitive to slow moving ground target. The paper presented the system model of a multi-carrier frequency sparse array MMW radar as well as preliminary simulation results, which showed future application of the system is very promising.

무선 및 유비쿼터스 통신을 위한 광 기술 응용의 직접 광/RF 변환 (Conversion of Optical/Radio-frequency by Applying Optical Technology for Wireless and Ubiquitous Communication)

  • 박기환
    • 대한전자공학회논문지TC
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    • 제45권12호
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    • pp.133-138
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    • 2008
  • 본 연구는 미래의 무선 및 유비쿼터스 통신을 위한 광/밀리미터파 신호의 직접 변환(생성) 실험을 50-60 GHz 범위에서 광 기술을 응용하여 성공적으로 수행하였다. 이 실험에서 22.5mW의 광신호가 광 도파로 내에 입사되었고, 밀리미터파 도파관 내부로 방사된 밀리미터파 신호는 밀리미터파 검출기에 의해 검출되었다. 밀리미터파 신호의 스펙트럼 선폭은 1 KHz이하를 나타냈다. 또, 50-60GHz 범위에서, 밀리미터파 신호의 Power 피크치 변위가 1.2dBm 이하인 이득특성을 나타냈다.

Thirty-two-tupling frequency millimeter-wave generation based on eight Mach-Zehnder modulators connected in parallel

  • Xinqiao Chen;Siyuan Dai;Zhihan Li;Wenyao Ba;Xu Chen
    • ETRI Journal
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    • 제46권2호
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    • pp.194-204
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    • 2024
  • A new method is proposed to generate a 32-tupling frequency millimeter wave (MMW) with eight Mach-Zehnder modulators (MZMs) connected in parallel. Theoretical analyses and simulation experiments are conducted. The optical sideband suppression ratio (OSSR) of the obtained ±16th order optical sidebands are 61.54 dB and 61.42 dB, and the radio frequency spurious suppression ratios (RFSSRs) of the generated 32-tupling frequency MMW are 55.52 dB and 55.27 dB based on the theoretical analysis and simulation experiments, respectively; these outcomes verified the feasibility of the new method. The main parameters used to affect the stability of the generated signal are the modulation index and extinction ratio of MZM. Their effects on the OSSR and RFSSR of the generated signals are investigated when they deviate from their designed values. Compared with the other proposed methods for the generation of 32-tupling frequency MMW by MZM, our method has the best spectral purity and stability, and it is expected to have important MMW over fiber applications.

스테레오 3mm 밀리미터파 영상을 이용한 은닉물체의 거리추정에 관한 연구 (Stereo 3 mm Millimeter Wave Imaging for Distance Estimation to Concealed Objects)

  • 염석원
    • 융합신호처리학회논문지
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    • 제18권1호
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    • pp.21-24
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    • 2017
  • 밀리미터파 영상시스템은 위험한 은닉 물체를 탐지하는 분야에 활용되고 있다. 능동형 시스템은 외부 RF 신호원이 필요하지만 수동형은 인체와 물체의 온도차에 의한 흑체복사 성질을 이용하므로 실내외에서 사용이 가능하다. 그러나 일반적으로 수동형 밀리미터파 영상은 온도분해능과 신호레벨이 낮고 잡음의 영향이 크다. 본 논문에서 은닉 물체까지의 거리 추정을 위한 수동형 스테레오 3mm 밀리미터파 영상에 관한 연구를 수행한다. 수평, 수직 편광 밀리미터파 영상시스템에서 획득한 두 쌍의 스테레오 영상을 이용하여 은닉물체를 k-means 클러스터링 알고리즘으로 몸체영역과 분할하고 물체의 중심 위치를 이용하여 거리를 추정한다. 실험에서 성공적으로 거리를 추정할 수 있음을 확인한다.

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은닉표적의 분할을 위한 실시간 Graphic User Interface 구현에 관한 연구 (A study on Real-time Graphic User Interface for Hidden Target Segmentation)

  • 염석원
    • 융합신호처리학회논문지
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    • 제17권2호
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    • pp.67-70
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    • 2016
  • 본 논문에서 8mm 파장영역에서 획득한 수동형 밀리미터파 영상을 이용하여 위험물체를 은닉한 대상으로부터 금속표적(권총)을 자동으로 분할하고 식별하는 실시간 그래픽 사용자 인터페이스(Graphic User Interface)를 구현한다. 은닉된 표적의 분할 방법은 다단계 영상 분할 방법을 이용한다. 다단계 영상 분할의 각 단계는 밀리미터파 영상의 히스토그램을 가우시안 혼합 모델(Gaussian Mixture Model)로 가정하고 LBG 양자화(Vector-Quantization)과 추정(Expectation)-최대화(Maximization) 알고리즘으로 구성된다. 첫 번째 단계에서 배경으로부터 몸체 영역을 분할하고 두 번째 단계에서 몸체로부터 은닉된 물체 영역을 순차적으로 분할한다. 실험 및 시뮬레이션에서는 그래픽 사용자 인터페이스 프로그램을 이용하여 분석된 결과를 보여준다.

밀리미터파 대역 링크에서 색 분산에 의한 성능 분석 (Analysis of Performance employing Chromatic Dispersion in Millimeter-wave Links)

  • 김정태
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2000년도 추계종합학술대회 논문집(2)
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    • pp.309-312
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    • 2000
  • In this paper, The Influence of chromatic fiber dispersion on the transmission distance of MMW(millimeter-wave) link is analyzed and discussed. It is shown that dispersion significantly limits the transmission distance in intensity modulated direct detection and heterodyne links operating in the above 20㎓ frequency region by inducing a carrier to noise penalty on the transmitted signal. We analyze and discuss the influence of dispersion induced CNR(Carrier to Noise Ratio) penalty for direct detection and heterodyne method from simulation.

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Energy Detector based Time of Arrival Estimation using a Neural Network with Millimeter Wave Signals

  • Liang, Xiaolin;Zhang, Hao;Gulliver, T. Aaron
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제10권7호
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    • pp.3050-3065
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    • 2016
  • Neural networks (NNs) are extensively used in applications requiring signal classification and regression analysis. In this paper, a NN based threshold selection algorithm for 60 GHz millimeter wave (MMW) time of arrival (TOA) estimation using an energy detector (ED) is proposed which is based on the skewness, kurtosis, and curl of the received energy block values. The best normalized threshold for a given signal-to-noise ratio (SNR) is determined, and the influence of the integration period and channel on the performance is investigated. Results are presented which show that the proposed NN based algorithm provides superior precision and better robustness than other ED based algorithms over a wide range of SNR values. Further, it is independent of the integration period and channel model.

Radio-over-Fiber 시스템을 위한 40 GHz 대역에서 직접 광스위칭 CDMA 연구 (Study on direct optical switching CDM at 40 GHz-band for Radio-over-Fiber(RoF) system)

  • 최재원;전영민;변영태;우덕하;박종대;서동선
    • 한국광학회지
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    • 제14권6호
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    • pp.600-605
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    • 2003
  • Radio-over-Fiber(RoF) 시스템에서 직접 광스위칭 CDMA(Direct Optical Switching CDMA : DOS-CDMA) 기법을 이용하여 기존 이동통신에서 연구되어왔던 수 ㎓ 대역보다 주파수가 훨씬 높은 40 ㎓ 대역의 MMW (millimeter wave)를 반송파로 사용한 차세대 이동통신을 위한 MMW DOS-CDMA 시스템 연구를 실험적으로 수행했다. 부호 분할 다중화에 사용된 직교 부호(orthogonal codes)는 단극성(unipolar) 형태의 상호상관이 2이하(crosscorrelation$\leq$2)인 부호열을 선택했으며, 부호 길이(code length)는 16 chips, 칩율(chip rate)은 2.5 Gchip/sec 였다. 광원은 10 ㎓ 광섬유 링 레이저를 유리고조모드 잠김시켜 진폭 균등화한 40 ㎓ 의 안정된 레이저 펄스를 발생시켜 사용하였다.