• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 추계학술대회 논문집 Vol.17
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• pp.456-459
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• 2004

Analog film/screen systems have been being changed to a digital x-ray imaging device using direct conversion materials. Photocoductors for a direct detection flat-panel imager require high x-ray absorption, ionization and charge collection, low leakage current and large area deposition. In this work, $HgI_2$ films with excellent properties for x-ray detector were deposited by screen printing method. The thickness of $HgI_2$ film was about $150\;{\mu}m$. The passivation layer is fabricated using a-Se and parlyene, the both fabrication $HgI_2$ film were compared for analyzing the leakage current reduction. We measured electrical properties-leakage current, photosensitivity, SNR though I-V measurement, As the result, $HgI_2$ film using a-Se passivation layer had the greater

• The Korean Journal of Physiology and Pharmacology
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• 제7권1호
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• pp.47-52
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• 2003

The prostate gland contains numerous neuroendocrine cells that are believed to influence the function of the prostate gland. Our recent study demonstrated the expression of both ${\alpha}1$- and ${\alpha}2$-ARs, signaling the release of stored $Ca^{2+}$ and the inhibition of N-type $Ca^{2+}$ channels, respectively, in rat prostate neuroendocrine cells (RPNECs). In this study, the effects of NA on the resting membrane potential (RMP) of RPNECs were investigated using a whole-cell patch clamp method. Fresh RPNECs were dissociated from the ventral lobe of rat prostate and identified from its characteristic shape; round or oval shape with dark cytoplasm. Under zero-current clamp conditions with KCl pipette solution, the resting membrane potential (RMP) of RPNECs was between -35 mV and -85 mV. In those RPNECs with relatively hyperpolarized RMP (＜-60 mV), the application of noradrenaline (NA, $1{\mu}M$) depolarized the membrane to around -40 mV. In contrast, the RPNECs with relatively depolarized RMP (＞-45 mV) showed a transient hyperpolarization and subsequent fluctuation at around -40 mV on application of NA. Under voltage clamp conditions (holding voltage, -40 mV) with CsCl pipette solution, NA evoked a slight inward current (＜-20 pA). NA induced a sharp increase of cytosolic $Ca^{2+}$ concentration ($[Ca^{2+}]_c$), measured by the fura-2 fluorescence, and the voltage clamp study showed the presence of charybdotoxin-sensitive $Ca^{2+}$-activated $K^+$ currents. In summary, adrenergic stimulation induced either depolarization or hyperpolarization of RPNECs, depending on the initial level of RMP. The inward current evoked by NA and the $Ca^{2+}$-activated $K^+$ current might partly explain the depolarization and hyperpolarization, respectively.

• 대한전자공학회논문지SP
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• 제44권2호
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• pp.126-136
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• 2007

현재 카메라들은 역광 환경에서 노출 시간 조절만으로 인간의 눈으로 볼 수 있는 것과 동일한 화질의 영상을 얻을 수 없으므로 역광 보정을 위한 화질 개선 방법이 필요하다. 기존의 화질 개선 방법으로는 Land의 인간의 시각적인 모델을 바탕으로 한 Retintex 알고리즘이 대표적이다. 그러나 처리 시간이 길고 역광 사진에 적용하는 경우 어두운 영역을 보정하기 위해 밝은 영역이 포화되어 버리는 문제가 있다. 그러므로 본 논문에서는 빠른 처리를 위해 연산량을 감소하고 어두운 영역과 밝은 영역의 균형 있는 Contrast 향상을 위하여 Retinex 알고리즘을 개선하여 새로운 알고리즘을 제안하고 K-Retinex 알고리즘이라 명명한다. 그리고 처리 시간과 영역별 표준 편차, Contrast Per Pixel 측정을 통해 제안된 알고리즘의 우수성을 입증하였다.

• 한국동물학회지
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• 제32권3호
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• pp.232-241
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• 1989

담수어류의 1종인 갈겨니의 cytosol malate dehydrogenaes는 A형과 B형이 발견되며 A형은 주로 남부 동해안의 수계와 일부 남해안지역에 분포하며 B형은 서부 내륙 및 남해안지역에 분포하고 있었다. 남해안의 일부지역에서는 sympatry를 형성하나 이들 2형사이의 잡종개체는 전혀 발견되지 않았다. Sympatry지역의 하나인 남해의 동천천 수계에서 고도 및 계절에 따른 A형과 B형은 빈도변화를 조사한 결과 A형은 수계의 상류에서 빈도가 높았고 겨울철에 빈도가 높아지는 반면 B형의 하류에서 빈도가 높았고 여름철에 빈도가 높아지는 것으로 보아 온도에 따라 선택적으로 영향을 받는다고 추측되며 이는 지리적 분포에서도 동일한 경향성을 나타내고 있다. Yang 등은 갈겨니의 기원이 약 100만년전 피라미에서 분화되었을 것이라 추정한 바 있고, Yang과 Min의 연구결과 A형과 B형의 분화연대를 약 70만년전으로 볼 때, 처음 피라미에서 분화된 갈겨니는 B형 갈겨니라 보며 B형 갈겨니에서 보다 저온 적응인 A형 갈겨니가 분화되었을 것이라 추측된다.

• 천문학회보
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• 제37권1호
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• pp.65.1-65.1
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• 2012

MIRIS (Multipurpose Infra-Red Imaging System) is the first Korean Infrared Space Telescope developed by KASI (Korea Astronomy and Space Science Institute), and is the main payload of STSAT-3 (Science and Technology Satellite-3). The FM (fight model) of MIRIS has been recently completed, and various performance tests have been made to measure system parameters such as readout noise, system gain, linearity, and dark current. Final thermal-vacumm test of the MIRIS and the vibration test of the electronics box have been performed. Band response tests showed good agreement with the initial design requirements. No significant dark difference was measured within the expected temperature variation range during observation in orbit. Using Pa-alpha band from a uniform source, the readout noise and system gain were measured by mean variance test. To obtain uniform flat image, flat fielding tests were made for each band, and the data will be compared to that obtained in orbit for calibration. The final version of MIRIS FM will be delivered in March, and it will be integrated into the satellite system for the AIT (Assembly Integration, Test) procedure. The launch of MIRIS is expected in November 2012.

• Asian Pacific Journal of Cancer Prevention
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• 제13권7호
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• pp.3179-3185
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• 2012

Background: Most of the epidemiology studies on the effects of sun exposure and prostate cancer were conducted among the temperate countries of North America and Europe. Little is known about the influence on Asian populations. The purpose of current study was to evaluate any association of sun exposure with risk of prostate cancer in Chinese, Malays and Indians who reside in the tropics. Methods: The Singapore Prostate Cancer Study is a hospital-based case-control study of 240 prostate cancer incident cases and 268 controls conducted in Singapore between April 2007 and May 2009. Detailed information on outdoor activities in the sun, skin colour, sun sensitivity and other possible risk factors were collected in personal interviews. Cases were further classified by Gleason scores and TNM staging. Odds ratios (OR) and 95% confidence intervals (CI) were calculated using unconditional logistic regression analysis, adjusted for age, ethnicity, education, family history of any cancers, BMI and skin colour. Results: We found that prostate cancer risk was increased in subjects with black/dark-brown eyes (OR 5.88, 95%CI 3.17-10.9), darker skin colour e.g. tan/dark brown/black (OR 7.62, 95%CI 3.41-17.0), frequent sunburn in lifetime (OR 4.30, 95%CI 1.7-11.2) and increased general sun exposure in adulthood per week (OR 2.03, 95%CI 1.09-3.81). The increased risk was consistent for high grade tumours and advanced stage prostate cancers. Conclusion: The findings from this study suggest that excessive sun exposure is a risk factor for prostate cancer in Asians.

• 한국양식학회지
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• 제16권1호
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• pp.44-50
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• 2003

가시파래의 자연 서식지에서 자연채묘 방법과 실내에서 포자방출에 의한 인공종묘생산 기술을 개발하고, 양성시험에 의한 완전한 양식방법을 개발하여 대량생산 가능성을 조사하였다. 가시파래 자연채묘는 자연 서식지의 사니질로 조성된 해역이 적합하였으며, 하계의 착생밀도는 채묘틀이 지면에서 20cm 높이에 시설하는 것이 높았고, 추계에는 40cm 높이에 시설하는 것이 효과적이었다. 가시파래 인공종묘 생산은 성숙한 모조를 12~24시간 음건하여 포자를 방출하고, 포자액이 들어있는 수조에 채묘망을 넣고 24시간 암흑처리하면 포자 착생률이 높게 나타났다. 가시파래 양성은 수심이 낮고 저질이 니질 또는 사니질로 조성된 해역은 지주식으로 시설하며, 수심이 깊고 유속이 빠른 해역은 부류식으로 시설하는 것이 좋았다. 양성장소는 영양염이 풍부하고 파랑에 의한 엽체의 탈락과 시설물 파손이 적은 해역이 양호하였으며, 광합성률을 높이기 위하여 표층노출식으로 시설하는 것이 생산량이 많았다.

• 대한전자공학회논문지SD
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• 제37권8호
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• pp.42-47
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• 2000

분자선결정성장법을 이용하여 자기구성 양자점들을 high electron mobility transistor (HEMT)의 체널 영역에 삽입하여, 양자점내의 inter-subband transition을 이용한 전파장 적외선 수광소자를 제작하였다. 제작된 소자는 180 K 이상의 온도에서 InAs 양자점의 전자에 대한 강한 구속력으로 인해 낮은 암전류 특성을 보이며 7${\mu}m$에서 11${\mu}m$까지의 넓은 수광영역을 나타내었다. 9.4${\mu}m$에서 peak 광전류가 검출되었으며 이때의 검출율은 $1.93{\times}10^{10}cmHz^{1/2}/W$ 였다. 장파장 적외선 검출에 따른 광전류는 가해진 전압에 대하여 전계효과트랜지스터와 같은 전류-전압 특성을 가지며, 인가된 전압이 증가함에 따라 증가된 암전류에 의하여 광전류가 감소하는 특성을 보여주고 있다.

• 한국의상디자인학회지
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• 제16권4호
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• pp.205-215
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• 2014

This study analyzed 'The representation of death' as expressed in the fashion photography posted on Facebook. Currently, there is a growing interest in 'Well-dying'. Also contemporary art and fashion is a trend that expressed what about death more than life. And today, Facebook is one of the current worldwide as a powerful communication. Death representation in contemporary fashion photography, as expressed in its first characteristic is 'Vanitas', and the main material was a skull. The shape of a skeleton of the symbol of death. Vanitas of inner meaning is vain, a mortal life's futility and death for the paradoxical emotion. The second characteristic is 'Phantom of the ruins'. This is like the darkness of death, and the shape represented in that space. And the death representation is depressed, gloomy atmosphere, dead-man and warm-less. Inner meaning is curiosity about the ghosts and the decadence romantic about the afterlife. The last characteristic is 'Grotesque'. This characteristic is the destruction of the body, fear of sadistic, and inhuman shape. This is parable with death that pain and fear of death, dark fantasy, the appearance of a contradiction modern society and cut off humanity. Inner meaning is the dark fear of death and the anger of wrong of the present society. At present, we have to reproduce the death, and what we want is eventually no one can escape 'Attention to death'. In addition, by expressing the solidarity between death and life is to want to get a consolation for the anxiety and afraid reality.

• 한국표면공학회지
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• 제50권5호
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• pp.308-314
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• 2017

Anodic film formation behavior of AZ31 Mg alloy was studied as a function of NaOH concentration in 1 M $Na_2CO_3$ + 0.5 M $Na_2SiO_3$ solution under the application of a constant anodic current density, based on the analyses of voltage-time curves, surface appearances and morphologies of the anodically formed PEO (plasma electrolytic oxidation) films. The anodic film formation voltage and its fluctuations became largely lowered with increasing added NaOH concentration in the solution. Two different types of film defects, large size dark spots indented from the original surface and locally extruded white spots, were observed on the PEO-treated surface, depending on the concentration of added NaOH. The large size dark spots appeared only when added NaOH concentration is less than 0.2 M and they seem to result from the local detachments of porous PEO films. The white spots were observed to be very porous and locally extruded and their size became smaller with increasing added NaOH concentration. The white spot defects disappeared completely when more than 0.8 M NaOH is added in the solution. Concludingly it is suggested that the presence of enough concentration of $OH^-$ ions in the carbonate and silicate ion-containing electrolyte can prevent local thickening and/or detachment of the PEO films on the AZ31 Mg alloy surface and lower the PEO film formation voltage less than 70 V.