• 한국지리정보학회지
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• 제17권4호
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• pp.189-199
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• 2014

범람원(floodplain)은 제방과 하천 사이에 존재하는 평탄하고 낮은 지역을 의미하며, 범람원 내 토지 이용 현황 분석은 하천유역의 효과적인 자원관리를 위해서 반드시 필요하다. 본 논문에서는 공간정보 자료인 LiDAR DEM 자료와 RapidEye 영상을 이용하여 낙동강 하천 범람원 내 토지 이용 현황 분석에 관한 연구를 진행하였다. 우선, DEM으로부터 제방 경계선을 추출하여 RapidEye 영상에서 연구대상지역 내 범람원의 범위를 설정하였다. 범람원의 범위를 설정한 뒤, RapidEye 영상에 ISODATA 클러스터링 및 post-classification 과정을 적용하여 범람원 내 토지피복 분류 작업을 진행하였다. ISODATA 클러스터링을 적용하여 분류된 범람원 내 토지피복은 91%의 분류 정확도를 가진다. 분류된 토지피복 클러스터들을 구성하는 픽셀들의 개수를 계산하여, 낙동강 범람원 내 토지 이용 현황에 관한 분석을 수행하였다. 본 연구를 통하여, 연구대상지역 범람원 내 하천의 면적은 46%, 나지의 면적은 36%, 습지의 면적은 11%, 그리고 초지의 면적은 7%라는 사실을 알 수 있었다.

• 한국전자파학회논문지
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• 제20권11호
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• pp.1130-1137
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• 2009

본 논문은 지상파 DMB에서 기준 클락 신호에 의한 RF 수신기의 민감도 열화 현상을 분석하고, 이를 해결하기 위한 새로운 PCB 설계 기법을 제안하였다. 현재 DMB 수신기 시스템에 사용되는 기준 주파수는 16.384 MHz, 19.2 MHz, 24.576 MHz의 세 종류가 있다. 이러한 기준 주파수의 고조파 성분이 RF 채널 주파수에 근접할 경우, 해당 채널의 감도가 심각히 열화될 수 있다. 이러한 클락 고조파 결합 문제를 해결하기 위해 스트립라인 형태의 새로운 클락 배선 설계 기법을 제안하였다. 제안된 기법은 인덕턴스 성분을 사용하여 클락 신호의 접지 단자를 주 접지 단자와 분리하고, 클락 신호선과 주변 접지면의 결합 커패시턴스 성분을 최소화 하도록 설계되었다. 이를 DMB 수신기 보드에 적용하여 수신기의 감도가 최대 2 dB 개선됨을 측정을 통하여 확인하였다.

• 조형예술학연구
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• 제8권
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• pp.267-296
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• 2005

Typography, as the median for communication, has expanded its roles according the attributes of the media where it Is used, and the change of media follwing the change of times is presenting new directions to the field of typography. The attempts of 20C experimental typography prioritize visual formativeness, free typography and language started to appear on printed matters and different kinds of prints put pep in magazines. Thus, experiments in the aspects of effective delivery of inpormation that letters have and aesthetic side of shapes of letter are continuing. Today with the appearance of multimedia, development of visual colture and rapid development of digital technology, the range of experimental typography has expanded even wider and therefore, different kinds of expressions became possible. As seen above, unlike the existing static printed media that carries linguistic information only, letters in the multimedia environment is shown in the movie titles, TV or web not only as a basic visual media such as type and image, but as a dynamic and complex factor that contains additional information of motion and sound factor. This study will attempt to find the historic context of focus of moment from the kinetic art and define the moving letters as kinetic typography. Therefore, this paper will have an understanding on kinetic typography's background, concept and characteristics following the change of communication environment in the multimedia era and tried to study the basic theories of kinetic typography and the information delivery and imagery function of letters. Also, this paper attempted to carry out a study on whether kinetic typography is delivering information smoothly from the aspect of communication through the image role as delivering information by studying major works of artists who have influenced kinetic typography. Based on this study, I would like to suggest new direction for effective delivery of information and value of use.

• 한국통신학회논문지
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• 제28권7C호
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• pp.678-687
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• 2003

전력 및 대역폭 제한적인 디지털 통신 시스템을 위한 새로운 변복조 기술인 8SQAM(8-state Superposed Quadrature Amplitude Modulation)은 인접하는 두 심볼간에 진폭과 위상이 상관관계를 유지함으로써 부드럽고 연속적인 위상천이와 함께 적은 포락선 변동을 갖는 출력신호를 생성한다. 또한 8SQAM신호는 심볼간 간섭이 없으며 compact한 스펙트럼 특성을 갖는다. 따라서 8SQAM은 기존의 8PSK와 비교하여 비선형 왜곡에 의한 혼변조(IM)와 인접 심볼 간섭(ISI) 그리고 다중채널(SCPC-FDMA) 환경에서의 인접 채널 간섭(ACI) 영향을 적게 받는다. 본 논문에서는 비선형 증폭 다중채널 간섭 환경에서 8SQAM 시스템의 수신 성능을 전산모의 실험을 통해서 분석하였다. 전산모의 실험 결과 8SQAM은 고출력증폭기(HPA)의 Input back-off(IBO)가 1dB이고 채널 간격이 데이터 비트 율의 41.7%(즉, 스펙트럼 효율 =2.40b/s/Hz)일 때, BER=1$\times$$10^{-4}$ 을 유지하기 위해 요구되는 CNR이 $\alpha$= 0.3의 roll-off 값을 갖는 8PSK 보다 2.7dB 우수한 성능을 보였다.

• Imaging Science in Dentistry
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• 제42권3호
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• pp.155-161
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• 2012

Purpose: This study was performed to investigate the prevalence, morphology, and calcification pattern of the elongated styloid process in the Mathura population and its relation to gender, age, and mandibular movements. Materials and Methods: The study analyzed digital panoramic radiographs of 2,706 adults. The elongated styloid process was classified with the radiographic appearance based on the morphology and calcification pattern. The limits of mandibular protrusion were evaluated for each subject. The data were analyzed by using a Student's t-test and chi-squared test with significance set at p=0.05. Results: Bilateral elongation having an "elongated" type styloid process with a "partially mineralized" pattern was the most frequent type of styloid process. No correlation was found between styloid process type and calcification pattern on the one hand and gender on the other, although elongated styloid was more prevalent in older and male populations (p<0.05). Further styloid process elongation showed no effect on mandibular protrusive movement (p>0.05). Conclusion: Dentists should recognize the existence of morphological variation in elongated styloid process or Eagle syndrome apparent on panoramic radiographs. We found higher prevalence of elongated styloid process in the population of the Mathura region when compared with other Indian populations. The calcification of the styloid process was more common in the older age group with no correlation to gender, mandibular movement and site. "Type I" with a "partially calcified" styloid process was observed more frequently in the population studied.

• 조명전기설비학회논문지
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• 제29권8호
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• pp.98-103
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• 2015

Power plant is that very high reliability when industrial and economic impact on the overall electric power system is required, it is essential to improve the reliability, especially the fault prediction diagnosis. Since an accident caused by the partial discharge in the power plant is above state has a faster response characteristic than the other indications in the case of any, the partial discharge generated in the power plant immediately detect the deterioration of insulation due to the accident of the power plant and the non-drawn It should prevent or reduce. Partial Discharge Measuring Systems for UHV SF6 Gas Insulated Switchgear and power transformer on site installed has some probability of abnormal recognition in case of non-flexible deal with on site noise. Many methode to eliminate these kinds of noises, UHF Detection System is chosen as purchase description in Korea, but this system having a bandwidth between 500MHz 1.5GHz wide band. Initial install periods(about 20 years ago), this band had no strong signal source, but in these days this wide band have strong signals, such as LTE. So, module described in this paper is designed as simultaneously use with wide and narrow band for solve this noise problem, and introduce this system.

• 한국산학기술학회논문지
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• 제12권4호
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• pp.1817-1823
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• 2011

도시철도 분야에서 멀티미디어 전송을 위하여 18GHz 대역에서 영상전송을 위한 OFDM변조 방식이 이용되고 있다. 양방향으로 영상뿐만 아니라 이더넷 데이터를 전송하기 위한 응용분야가 크게 늘고 있다. 도시철도 분야에 적용된 18GHz분야는 멀티패스페이딩에 영향이 크므로 OFDM캐리어 개수가 큰 경우가 유리하다. 그러나 이더넷 전송이 가능한 기존 WLAN의 경우 캐리어의 개수가 64개로 원거리 고속이동에 적합하지 않다. 따라서 본 연구에서 고속이동체에서 고속데이터 전송에 적합한 2,000 캐리어의 OFDM 이더넷 모뎀을 구현하고 검증하였다. 고속이동에서 도플러효과를 상쇄하기 위하여 도플러보상 블럭을 구현하였다. 도시철도 및 고속철도 분야에서 기술의 활용이 크게 기대 된다.

• Anatomy and Cell Biology
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• 제51권4호
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• pp.232-235
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• 2018

Portal vein provides about three-fourths of liver's blood supply. Portal vein is formed behind the neck of pancreas, at the level of the second lumbar vertebra and formed from the convergence of superior mesenteric and splenic veins. The purpose of this study is to review the normal distribution and variation, morphometry of portal vein and its branches for their implication in liver surgery and preoperative portal vein embolization. It is also helpful for radiologists while performing radiological procedures. A total of fresh 40 livers with intact splenic and superior mesenteric vein were collected from the mortuary of Forensic Department, JSS Medical College and Mysuru Medical College. The silicone gel was injected into the portal vein and different segments were identified and portal vein variants were noted. The morphometry of portal vein was measured by using digital sliding calipers. The different types of portal vein segmental variants were observed. The present study showed predominant type I in 90% cases, type II 7.5% cases, and type III 2.5% cases. Mean and standard deviation (SD) of length of right portal vein among males and females were $2.096{\pm}0.602cm$ and $1.706{\pm}0.297cm$, respectively. Mean and SD of length of left portal vein among males and females were $3.450{\pm}0.661cm$ and $3.075{\pm}0.632cm$, respectively. The difference in the Mean among the males and females with respect to length of right portal vein and left portal vein was found to be statistically significant (P=0.010). Prior knowledge of variations regarding the formation, termination and tributaries of portal vein are very helpful and important for surgeons to perform liver surgeries like liver transplantation, segmentectomy and for Interventional Radiologists.

• 한국정보통신학회논문지
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• 제25권3호
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• pp.427-432
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• 2021

본 논문에서는 미상의 통신신호에 대한 자동 변조 인식을 위하여 심층신경망인 딥뉴럴네트워크를 적용하여 변조 형태를 식별하고 그 성능을 분석하였다. 신경망 입력 데이터는 변조된 신호의 시간영역 디지털샘플 데이터, FFT(Fast Fourier Transform)를 적용한 주파수영역 데이터, 시간 및 주파수영역 혼합데이터를 사용하여 각각의 변조인식 성능을 확인하였다. 아날로그 변조 및 디지털 변조 신호 11종에 대하여 -20~18 dB 까지 다양한 SNR(Signal to Noise Ratio) 환경에서 변조인식 성능을 확인하고 그 성능을 분석하였으며, 입력 데이터의 종류에 따른 학습 속도를 확인함으로써 제안한 방법이 실제적인 자동변조 인식 시스템 구축에 효과적인 방법임을 확인 하였다.

• 대한본초학회지
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• 제33권4호
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• pp.43-51
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• 2018

Objectives : Pharbitidis Semen, the seeds of Ipomoea nil (L.) Roth or I. purpurea (L.) Roth, is well-known traditional herbal medicine in Korea. But it is often marketed as a different seed or mixtures of its closely related species. Thus, the present study aims to provide external and micromorphological characters and identification key by using stereoscope (ST) and scanning electron microscope (SEM) for discriminating authentic of Pharbitidis Semen. Methods : A discrimination on external morphological characteristics of sepals, fruits, seeds, and hilum, testa cell micromorphology in the original plants and its congeneric species was carried out using digital calipers, ST, and SEM. Results : Number of valves (degree of apex of each valve), number of seeds per locule, hairy in capsules and size, luster, density of hairy, hilum shape in seeds and shape of cell, anticlinal, periclinal wall in testa may have high discriminative value. The seeds of Ipomoea nil as an original plant of Pharbitidis Semen were distinguished from other species by the relative larger in size, ovoid-trigonous in shape, mostly flabellate or triangular to trapezoid in outline (c.s.), dull, and puberulent in surface and thicken anticlinal wall. Conclusions : On the basis of the results, an identification key of Pharbitidis Semen and closely related species is provided. Our observations suggest that the combination of morphological characters and other studied results could be helpful in the successfully identified authentic herbal medicines. Moreover, micromorphological characters using SEM could be useful for discriminating authentic medicines.