• 한국컴퓨터정보학회논문지
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• 제16권4호
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• pp.189-196
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• 2011

센서 네트워크기술과 모바일 장치가 연동된 애플리케이션이 사용된 연구는 주로 기후나 온도 변화, 재해 등의 환경 모니터링 관련 분야와 모바일 헬스 케어 관련 애플리케이션이 최근의 주된 이슈 사항이 되어 왔다. 본 논문에서는 안드로이드 폰으로 제어가 가능하고, 그린 스마트 팩토리 영역을 효율적으로 모니터링하고 관리할 수 있는 M2M 서비스 기반 스마트 팩토리 관리 시스템(SFMS: Smart Factory Management System)을 제안한다. 제안된 시스템은 TinyOS 기반의 IEEE 802.15.4 표준 스택을 적용하여 스마트 센서 네트워크를 구성하며, 제안한 시스템 구조의 기능성 검증을 위하여 온도/습도, 도어, 적외선(PIR), 카메라 센서로 센서 망을 구성하여 센싱 이벤트 요청 및 제공 테스트를 수행하였다.

• 자원환경지질
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• 제28권4호
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• pp.405-414
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• 1995

LANDSAT TM 자료를 이용한 지형변화를 관측하는데 알맞은 알고리즘에 대한 고찰과 이 알고리즘을 1986년 4월 15일과 1992년 9월 22일 경기만에서 얻어진 LANDSAT TM 자료에 적용하여 타당성을 시험하였다. 이 알고리즘은 변화벡터분석법과 tasseled cap 변환을 이용한 방법이다. 변화벡터분석법은 영상자료간의 변화를 관측하는데는 우수하지만 그 변화벡터의 수가 증가함에 따라 효율이 감소하는 단점이 있다. 이와 같은 단점을 보완하기 위해 tasseled cap 변환을 이용함으로서 원래 6개 밴드의 LANDSAT TM 자료를 두 개의 밴드 즉 Brightness와 Greenness로 줄일 수 있게 된다. 시험적용 결과 이 알고리즘은 해안선 일대에서의 대규모 지형변화뿐만 아니라 육안관측으로는 어려운 미세한 변화까지도 관측 가능한 것으로 나타났다. 그러나 본 연구결과의 변화벡터 영상에서는 인공적인 변화에 더 민감한 것으로 나타났는데 이는 본 연구에 사용된 두 LANDSAT TM 자료가 얻어진 시간 간격이 지질학적 작용에 의한 변화가 나타나기에는 비교적 짧기 때문인 것으로 사료된다.

• 대한두경부종양학회지
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• 제14권1호
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• pp.35-39
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• 1998

Objectives: Minimal improvement in the long-term survival of head and neck cancer(HNC) patients has occurred despite a multitude of advances in the control of loco regional disease and a second primary malignancy(SPM) contribute to the continued poor prognosis for the HNC patients. This study was performed in order to identify the clinical characteristics of SPM in the HNC patients. Materials and Methods: The medical records of 354 patients of head and neck squamous cell carcinoma that were followed up after initial treatment during the period of 1987 through 1994 were reviewed. This study examines the medical records of 354 patients with squamous cell carcinoma of the head and neck, of whom 26 subsequently developed a second neoplasm. Results: The actuarial SPM rate was 7.3%, and median time to presentation for the SPM was 26.8 months. The SPM were more likely to occur in male patients who had oral cavity index tumors. Patient whose index tumor was small at diagnosis had a greater chance of developing a second tumor as did those with no cervical lymph node metastases to the neck. Initial treatment modality was not associated with an increased risk of developing a second tumor. The commonest sites for the SPM were the lung and other head and neck area. The 3-year survival for patients who developed a secondary tumor from the time of its diagnosis was 27.8%. Conclusion: The SPM in the head and neck cancer patients are not uncommon and early detection of the SPM will contribute to increase the long-term survival of HNC patients.

• 열처리공학회지
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• 제13권5호
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• pp.309-317
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• 2000

Demand for new nondestructive evaluations is growing to detect tensile crack growth behavior to predict long term performance of materials and structure in aggressive environments, especially when they are in non-visible area. Acoustic emission technique is well suited to these problems and has drawn a keen interests because of its dynamic detection ability, extreme sensitivity and location of growing defects. In this study, we investigated the strength of fire resistance steel for frame structure by tensile test after degradation treatment and analysed acoustic emission signals obtained from tensile test with time frequency analysis methods. In the T and TN specimens(under $600^{\circ}C$-10min ) consisting of ferrite and pearlite structure, most of acoustic emission events were produced near yield point, mainly due to the dislocation activities during the deformation. However, B specimen under $600^{\circ}C$-10min had a two peak which was attribute to the presence of martensite phase. The first peak is before yield point and the second after yield point. The sources of second acoustic emission peak were the debonding of martensite-martensite interface and the micro-cracking of brittle martensite phase. In $600^{\circ}C$-30min to $700^{\circ}C$-60min, many signals were observed before yield point and were decreased after yield point.

• 한국환경복원기술학회지
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• 제10권5호
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• pp.20-30
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• 2007

Environmental Conservation Value Assessment Map (ECVAM) is the class map to divide the national land into conservation areas and development areas based on legal and ecological assessment criteria. It contributes to enhancements of the efficiency and the scientificity when framing a policy in various fields including the environment. However, it is impossible to understand the multiphase vegetation structure as data on judging the national forest class in ECVAM are restricted to areal information of Ecological Nature Status, Degree of Green Naturality and Forest Map. This point drops the reliability of ECVAM. Therefore we constructed vegetation information using LiDAR (Light Detection And Raging) technology. We generated Biomass Class Maps as final results of this study, to introduce the new forest assessment criterion in ECVAM that alternates or makes up for existing forest assessment criteria. And then, we compared these with Forest Map and Landsat TM NDVI image. As a result, biomass classes are generally higher than stand age classes and DBH classes of Vegetation Map, and lower than NDVI of Landsat TM image because of the difference of time on data construction. However distributions between these classes are mostly similar. Therefore we estimates that it is possible to apply the biomass item to the new forest assessment criterion of ECVAM. The introduction of the biomass in ECVAM makes it useful to detect the vegetation succession, to adjust the class of the changed zone since the production of Vegetation Map and to rectify the class error of Vegetation Map because variations on tree heights, forest area, gaps between trees, vegetation vitality and so on are acquired as interim findings in process of computing biomass.

• Parasites, Hosts and Diseases
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• 제53권1호
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• pp.77-83
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• 2015

Wuchereria bancrofti, Dirofilaria immitis, and Dirofilaria repens are filarial nematodes transmitted by mosquitoes belonging to Culex, Aedes, and Anopheles genera. Screening by vector dissection is a tiresome technique. We aimed to screen filarial parasites in their vectors by single and multiplex PCR and evaluate the usefulness of multiplex PCR as a rapid xenomonitoring and simultaneous differentiation tool, in area where 3 filarial parasites are coexisting. Female mosquitoes were collected from 7 localities in Assiut Governorate, were microscopically identified and divided into pools according to their species and collection site. Detection of W. bancrofti, D. immitis, and D. repens using single PCR was reached followed by multiplex PCR. Usefulness of multiplex PCR was evaluated by testing mosquito pools to know which genera and species are used by filarial parasites as a vector. An overall estimated rate of infection (ERI) in mosquitoes was 0.6%; the highest was Culex spp. (0.47%). W. bancrofti, D. immitis, and D. repens could be simultaneously and differentially detected in infected vectors by using multiplex PCR. Out of 100 mosquito pools, 8 were positive for W. bancrofti (ERI of 0.33%) and 3 pools each were positive for D. immitis and D. repens (ERI 0.12%). The technique showed 100% sensitivity and 98% specificity. El-Nikhila, El-Matiaa villages, and Sahel Seleem district in Assiut Governorate, Egypt are still endemic foci for filarial parasites. Multiplex PCR offers a reliable procedure for molecular xenomonitoring of filariasis within their respective vectors in endemic areas. Therefore, it is recommended for evaluation of mosquito infection after lymphatic filariasis eradication programs.

• Radiation Oncology Journal
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• 제2권1호
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• pp.11-20
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• 1984

The renewed interest in the use of hyperthermia in cancer therapy is bases on radiobiological and clinical evidence indicated that there may be a significant therapeutic advantage with the use of heat alone or combined with radiation or chemotherapy, There are many methods for generating heat for localized tumor as like radiofrequency, microwave, electromagnetic induction and ultrasound. But it is very difficult to be even thermal dose distribution and stable output of power and then the detection of temperature in tumor is difficult to be precise with thermocouples and semiconductor sensors. We designed the microwave heating generator, dipole antenna applicators and autometic temperature controlled thermocouples for localized hyperthermia on skin and in cavities. 1. The microwave generator with 120 W, 2,450MHz magnetron could be heating up to $40^{\circ}C\~50^{\circ}C\;for\;1\~2$ hours in living tissues. 2. The thermal dose distribution in tissue with microwave was described $42^{\circ}C\~44^{\circ}C$ with in 3 cm depth and $2\~6cm$ diameter area. 3. Skin surface heating applicator with spiral 3 times wave length antenna radiated high Power of microwave. 4, Intracavitary heating applicator with dipole antenna with autometic control temperature sensor kept up continuously constant temperature in tissue. 5. For constant thermal distribution, applied two steps power with 10W microwave after $17\~20W$ during first 10 minutes. 6. The cooling rate by blood flew in living tissue was rised as $10\%$ then meats.

• 대한전자공학회논문지TC
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• 제43권1호
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• pp.49-56
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• 2006

본 논문에서는 2003년 표준화된 저속, 저전력, 저가의 근거리 무선 통신망(WPAN, Wireless Personal Area Network)기술로서 유비쿼터스 센서 네트워크를 위한 IEEE 802.15.4 LR-WPAN 표준의 2.4GHz 대역의 물리계층에 대한 설계 및 검증에 관해 기술하였다. IEEE 802.15.4 LR-WPAN 표준에서 제시하는 주파수 tolerance 인 ${\pm}40ppm$을 만족하는 반송파 주파수 옵셋 보상 방법과 다양한 유비쿼터스 센서 네트워크 환경에 적절하게 반응하기 위한 임계값 재 설정 방법의 적응형 정합 필터에 기반한 심볼 동기부를 설계하였다. 본 논문에서 제안한 방법에 의해 동기를 위한 연산량이 i, q 위상에서 각각 1/l6으로 감소가 되었으며, 약 0.5dB의 성능 향상을 얻을 수 있었다. 하드웨어 구현은 verilog HDL을 사용하였고, FGPA를 이용한 테스트 보드를 통해 성능 검증을 수행하였다.

• 대한전자공학회논문지SD
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• 제47권3호
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• pp.41-50
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• 2010

본 논문에서는 2개의 송수신 안테나를 갖는 MIMO 통신 시스템을 위한 면적 효율적인 심볼 검출기의 구조를 제안한다. 제안된 심볼 검출기는 MIMO 전송 기법 중 공간 다이버시티 모드뿐 아니라 공간 다중화 모드를 모두 지원하며, ML 수준의 성능을 제공한다. 또한, 다단 (multi-stage) 파이프라인 구조와 극좌표 형태의 복소수 승산 방법을 사용하여 연산 블록의 공유와 연산기의 단순화를 진행하였고, 이를 통해 하드웨어 복잡도를 크게 감소시켰다. 제안된 하드웨어 구조는 하드웨어 설계 언어(HDL)를 이용하여 설계 되었고, Xilinx Virtex-5 XC5VLX220 FPGA에 기반하여 구현되었다. 그 결과 기존의 설계 구조와 비교시 35.3% 감소된 logic slices, 85.3% 감소된 DSP48s (dedicated multiplier)로 구현 가능함을 확인하였다.

• 한국전자통신학회논문지
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• 제10권11호
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• pp.1307-1314
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• 2015

본 논문에서는 얼굴 인식을 위한 보다 안정적이며 조명 변화와 회전에 강인하게 얼굴 영역을 검출하며, 계산의 효율성과 검출 성능을 동시에 만족시키는 강인한 인식 알고리즘에 대해 제안한다. 제안하는 알고리즘은 전처리 과정을 거쳐 정규화한 후 얼굴 영역만을 분할 검출한 후 주성분분석(PCA)을 이용하여 특징벡터를 구한다. 또한 구해진 특징벡터를 SVM에 적용하여 최적의 이진분류를 진행함으로써 얼굴 영역에 대한 검증을 수행한다. 검증 후 특징벡터를 다시 LDA에 적용하여 2차원 공간상에서 유클리디안 거리 이용하여 최종 얼굴을 인식하게 된다. 본 논문에서 제안하는 방법으로 인식률의 안전성과 정확성을 향상시킬 수 있었으며, 차원 축소로 인해 많은 계산 량이 요구되지 않기 때문에 실시간 인식도 가능하다.