단일 밴드 중적외선 영상으로부터 표면온도 추정을 위한 기초연구

박욱 ( Wook Park ),이윤경 ( Yoon Kyung Lee ),원중선 ( Joong Sun Won ),이승근 ( Seung Geun Lee ),김종민 ( Jong Min Kim ) 大韓遠隔探査學會 2008 大韓遠隔探査學會誌 Vol.24 No.2

3~5μm 파장대의 중적외선 영상은 화산 활동이나 산불과 같이 고온 현상을 관측하는데 효과적이다. 그러나 중적외선 영역은 지표의 복사율과 대기의 영향으로 인한 변화가 매우 심하고, 특히 낮 영상의 경우 태양 복사량에 의한 영향도 고려해야 하는 어려움이 있다. 따라서 단일밴드인 중적외선 영상을 이용하여 표면온도를 얻기 위해서는 영상이 취득된 시간과 장소에서 관측된 태양 복사량 및 여러 가지 대기 변수가 필요하다. 이 연구는 기존의 다중밴드 기반의 중적외선 영상 활용방법과 달리 단일 밴드 중적외선 영상을 이용하여 표면온도 측정을 위한 기초연구에 그 목적이 있다. 이를 위하여 MODIS 영상을 대상으로 MODTRAN을 사용하여 중적외선 영역의 대기보정 기법을 적용 한 뒤 복사전달 모델을 이용하여 지표의 온도를 측정하였다. 획득된 온도 영상의 정밀도를 측정하기 위해 기존의 온도 알고리즘인 MODIS Sea Surface Temperature 알고리즘에 의해 얻어진 해수온도와 비교를 통하여 오차 원인에 대해 분석을 실시하였다. 두 결과의 온도 차는 낮 영상의 경우 0.89±0.54℃ 밤 영상의 경우 1.25±0.41℃로 비교적 긍정적인 결과를 보였다. 그러나 낮 영상의 육지의 경우 대기에 의한 영향보다 태양빛의 반사가 주된 오차의 원인이 되며 이는 지표 복사율에 의한 영향이 매우 크게 작용하고 있음을 추정할 수 있다. 이 연구는 현재까지 해수에 대한 적용에 국한된 것으로 육상의 경우 복사율 변화가 매우 크기 때문에 중적외선 단일밴드에 의한 온도추정이 매우 어려울 것으로 예상된다. Middle-infrared (MIR) spectral region between 3.0 and 5.0 μm in wavelength is useful for observing high temperature events such as volcanic activities and forest fire. However, atmospheric effects and sun irradiance in day time has not been well studied for this MIR spectral band. The objectives of this basic study is to evaluate atmospheric effects and eventually to estimate surface temperature from a single channel MIR image, although a typical approach utilize split-window method using more than two channels. Several parameters are involved for the correction including various atmospheric data and sun-irradiance at the area of interest. To evaluate the effect of sun irradiance, MODIS MIR images acquired in day and night times were used for comparison. Atmospheric parameters were modeled by MODTRAN, and applied to a radiative transfer model for estimating the sea surface temperature. MODIS Sea Surface Temperature algorithm based upon multi-channel observation was performed in comparison with results from the radiative transfer model from a single channel. Temperature difference of the two methods was 0.89±0.54℃ and 1.25±0.41℃ from the day-time and night-time images, respectively. It is also shown that the emissivity effect has by more largely influenced on the estimated temperature than atmospheric effects. Although the test results encourage using a single channel MIR observation, it must be noted that the results were obtained from water body not from land surface. Because emissivity greatly varies on land, it is very difficult to retrieval land surface temperature from a single channel MIR data.

외음부의 기저세포암

김보영 ( Bo Young Kim ),황선정 ( Sun Jung Hwang ),박병준 ( Byung Joon Park ),이은실 ( Eun Sil Lee ),한호섭 ( Ho Suap Han ),김용욱 ( Yong Wook Kim ),김태응 ( Tae Eung Kim ),노덕영 ( Duck Yeong Ro ),이안희 ( An Hi Lee ) 대한산부인과학회 2010 Obstetrics & Gynecology Science Vol.53 No.9

Basal cell carcinoma (BCC) is the most common human malignant neoplasm, accounting for 75% of all non-melanoma skin cancer. The incidence of BCC is strongly correlated with sun exposure as well as older age. Therefore, the vast majority of BCCs is observed in elderly patients on the sun-exposed skin of the head and neck with a frequency of more than 80%. BCC is very rare on sun-protected skin such as the perianal and genital regions and other etiologic factors must be considered in these cases. Although the pathogenesis of vulvar BCC is unclear, early diagnosis is very important. Because BCC in these areas sometimes seems innocuous, it is recommended that a biopsy of all suspect lesions be performed. We report a woman with BCC of the vulva treated with wide local resection and reviews the literatures on this subject.

세라믹/금속접합재에 대한 접합계면의 응력특이장해석

박영철,허선철,윤두표,강재욱 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1

Since the ceramic/metal joints at high temperature, the residual stress will develops during when it is cooled from bonding temperature due to remarkable difference of thermal expansion coefficient betwen ceramic and metal. Moreover, the edge of jointed interface makes singular stress field in the ceramic/metal joints and this singular stress field much influences on the strength of joints. In this study, the influence of residual stress, mechnical load and repeat thermal cycle were estimated in the ceramic/metal joints. According to this influence, the change of singular stress field was analyzed. The results are as follow : 1) Strength of joints was evaluated by the stress singularity index λ and the intensity K of singular stress field. 2) the stress singularity index λ and the intensity K of singular stress field also increase as adding temperature of thermal cycle and its number of cycle. 3) In the case of mechanical load, the influence of residual stress reduces since the difference(Δλ) of stress singular index between existence and inexistence of residual stress decreases in proportion to the increasing of tensile load.

유동요소모델을 이용한 대공간 건축물의 실내 기류 예측에 관한 연구

박선효,안병욱 대한건축학회 2004 대한건축학회논문집 Vol.20 No.2

Flow element model is used for predicting indoor air distribution. The greatest assets of the flow element models are the facts that they are relatively easy to use, they require only a few input parameters, they are not very timeconsuming and they do not demand any investments of importance. Because the flow elements such as supply air jets, exhaust flows, thermal plumes, boundary layer flows, infiltration and gravity currents are controlled by the restricted number of parameters, the flow element model will be useful at the first stage of design process. Air distribution with inclined jets is widely used in large rooms of industrial and commercial buildings when chilled air is supplied through the grilles and nozzles. In this paper, Basic principles of air distribution with inclined jets through grilles and nozzles are discussed. In this study, computer program is developed to evaluate the dimensions of the occupied zone effectively ventilated by the jets through the studies of airflow parameters after impingement of inclined jets with surface.

온도 변화에 따른 DW-100 용접재의 기계적특성에 관한 연구

박원조,정재욱,변상열,허선철,유재환 경상대학교 해양산업연구소 2002 해양산업연구소보 Vol.15 No.-

In recent years, the studies of mechanical property of weld materials were one of the most important basic test of our welding indursty. The used specimen in this study is weld metal of DW-100 flux cored wire which is using for flux cored are welding and one type of flux cored wires were used in this test. This paper is based on the quality of the mechanical property of welding material under the different temperture, test temperature of each weld metal is from RT to 900℃ and temperature gap is 100℃ for each weld metal. It is particularly important to assess tensile properties and each specimen was examined using by the following methods; Reduction of area rate, Tensile strength test, and observation of SEM. All tensile tests were performed in accordance with the ASTM standard test method, tension testing of metallic materials (ASTM I-8). This study proves that the mechanical properties of until 400℃ were good as the increasing temperature compare with mechanical properties of RT. As the results of this study, the tensile strength of 300℃ was higher than other weld metals. Also the reduction of area rate was the lowest at 300℃ according to the previous test results. Consequently, this weld metal is a good substitute for the existing welding materials until 400℃ which is used in the development of welding industries today.

만성질환자에서 인풀루엔자 예방 접종의 효능 분석 : 후향적 환자-대조군 연구

박승철,정희진,손장욱,최선주,엄중식,우흥정,천병철,김우주 대한감염학회 2004 감염과 화학요법 Vol.36 No.4

목적: 인플루엔자는 예방접종을 통하여 효과적으로 예방이 가능한 대표적인 호흡기 감염질환이다. 미국이나 국내의 인플루엔자 예방접종 지침에서 고령인구(50세 또는 65세 이상)와 그 외의 만성질환자들을 인플루엔자 예방접종의 일차 대상자로 정하고 있다. 그러나 국내에서는 아직까지 만성질환자들에서의 인플루엔자 백신의 효능평가에 대한 연구결과가 없는 실정이며 국내에서의 만성질환의 분포가 외국의 그것과 일치하지 않기 때문에 본 연구에서는 국내 만성질환자들에서 인플루엔자 예방접종과 연관된 병원입원율의 차이를 비교해 보고자 하였다. 재료 및 방법 : 1999년 11월-2000년 3월(5개월간) 서울 소재 2개 대학병원에 입원한 만성질환자중 발열과 호흡기 증상이 있어 인플루엔자 또는 인플루엔자양 질환이 의심되거나 그로인한 만성질환의 악화로 추정되는 환자군과 이를 배제한 대조군을 중심으로 혈중 인플루엔자 항체가를 조사하였고 인플루엔자 백신접종력을 조사하였다. 결과의 해석은 로지스틱 회귀분석을 이용하였다. 결과 : 만성질환자를 대상으로한 환자 대조군 연구에서 2개 대학병원에서 1년간 조사한 결과 항체 검사에 기준하여 최종적으로 환자군 64명, 대조군 117명이 포함되었다. 환자군에서는 대부분이 호흡기질환(253%)과 심혈관계질환(313%)였던 반면에 대조군은 암(466%)이 가장 많았고 심혈관계질환과 호흡기계질환은 각각 134%, 60%로 낮았다. 또한 두군간에는 예방접종의 경력에서 통계적으로 유의한 차이를 보였으며 이때의 비차비(OR)은 0328로서 인플루엔자 예방접종의 입원 예방효능은 672%이었다. 결론 : 만성질환자, 특히 만성 심폐질환들에서의 인플루엔자 예방접종은 불필요한 입원을 줄이는 효과가 관찰되었다. 따라서 의료인들은 고위험군의 환자들에 대하여 인플루엔자 에방접종을 적극적으로 권장하고 실천하여야 하겠다. Background : Influenza is one of the preventable respiratory disease by annual vaccination. Elderly people and patients with chronic medical disease are the primary target for influenza vaccination according to ACIP (Advisory Committee on Immunization). This study was done to determine whether influenza vaccination affects hospitalization due to influenza like illness or it's related complications among chronic ill patients. Materials and methods : Retrospective, case-control study was conducted for 5 months (Nov. 1999-Mar. 2000). Physicians from two-university hospitals in Korea were instructed to collect clinical data, sera from subjects presenting with a flu-like illness or flu-related exacerbation in patients with chronic underlying diseases. We compared the vaccination history of case patients with control. Logistic regression analysis was used to calculate the odd ratio and efficacy of influenza vaccination. Results : Hospitalization due to ILI (influenza like illness) or it's related complications were observed more frequently in patients with chronic lung disease (25.3%) and chronic cardiac disease (31.3%) compared to others. Influenza vaccination resulted in fewer hospitalization with ILI or ILI-related acute exacerbation of underlying disease in chronic ill patients (adjusted odd ratio, 0.328 [CI, 0.14 to 0.73]) during influenza seasons. Conclusion : For patients with chronic disease, influenza vaccination is associated with substantial health benefit including fewer hospitalization. Health care providers should take advantage of all opportunities to immunize these high-risk patients.

저방사화강(JLF-1)의 고온 피로균열진전거동에 관한 연구

박원조,정재욱,허선철,허정원 경상대학교 해양산업연구소 2002 해양산업연구소보 Vol.15 No.-

The objective of this study is to investigate life and fatigue crack propagation in the Reduced Activation Ferritic steel(RAFs) JLF-1. Crack growth rate tests on compact tension specimen of thickness 12mm were conducted by using sinusoidal waveform. Compact tension specimens were used and crack growth rate da/dN and stress intensity factor range ΔK were analyzed concerning to the R value of 0.1, 0.3 and 0.5 In order to find out the value of ΔK, load amplitude constant method was applied by the standard fatigue testing method describes in ASTM E647-95a. The effects of stress ratio and specimen size on the fatigue crack growth propagation for JLF-1 steel were discussed within the Paris law. As the result of this study, fatigue crack growth rate increased with in creasing the load ratio, Consequently, fatigue crack propagation of half size specimen was similar to those of full size specimen at room temperature. Also, there was no difference between base metal and weld metal at room temperature and high temperature.(400℃)

각종 소화성질환에서의 Campylobacter Pylori의 검출에 관하여

허정욱,강영우,박준호,박승국,하경임,김재룡,안성훈,박선우 啓明大學校 醫科大學 1988 계명의대학술지 Vol.7 No.2

Peptic disorders are among the most common maladies in korea as the world. In most cases their etiologies not be established and their pathophysioolgy remain obscure. Although the persence of fastric bacteria has been logn established, recently campylobacter pylori seems to be etiologic agent of peptic disorders. Campylobacter pylori is visualized in most cases of peptic disorders and not visualized after treatment of bctericidal agents, bismuth compound or metronidazole. We had a following results for identification of campylocacter pylori in stomach and duodenal mcuosa via endoscipc biopsy. 1. We studied 54 patients who had dyspeptic symptoms, 29 males. 2. Most patients are in 5th decades, next in 3rd and 6th in order. 3. Ptients were composed of 27 peptic ulcer, 22 gastitis and 5 gastric carcinoma. 4. Campylobacter pylori was identified in 69% of total patients, peptic ulcer 63%, gastritis 77%, stomach carcinoma leastly.

초등 과학 교육 (지구과학 영역)을 위한 웹사이트 검색과 활용방안

한영욱,박선희 부산교육대학교 교육대학원 2001 논문집 Vol.3 No.-

The purposes of this study were to survey and analyze the internet web-site to use for teaching earth science in elementary science education, and then to analyze its effects on students' accomplishment and recognition. For these purposes, the web- site related to elementary earth science were searched and analyzed. Also, in order to manage a class, four classes were selected from sixth grade of elementary course and divided into two groups: two classes were assigned to a experimental group, the other two were belonged to a comparative group. The experimental group was taught by learning model of using web-site, and the comparative group was worked by traditional learning model. Before and after teaching, the students' accomplishment was tested using a test paper. And then, to analyze their results, the statistics was used. Student's recognition learning with web-site has been surveyed and analyzed. The results are as follows: 1. As a result of searching internet web-sites, meaningfully usable web-sites in a field of elementary earth science education were summed up to 79 sites: 15 sites in a field of meteorology, 23 sites in geology, 25 sites in astronomy, and 16 sites in common aspects. 2. After teaching using web-site, the average score of experimental group was higher than that of comparative group in a part of students' accomplishment. 3. Teaching using web-site didn't have statistically meaningful effects on boys and girls in a part of students' accomplishment. 4. Boys liked new contents and various materials. On the other hand, girls liked to select their own subjects and to repeat to study them. 5. The students recognized studying science with web-site affirmatively: 68.9% of students felt a great interest in using web-site and 89.2% of students answered that they wanted to learn using web-site later. 6. In a level of accomplishment and understanding of learning with web-site, lower level students felt more difficulty to use internet. We suggested that the learning using web-site has affirmative effect on students' accomplishment and recognition for learning with internet web-site. This affirmative effect is caused by these merits students are able to have free and independent works regardless time and place, and get access easily to new and various materials, and they can experience impossible experiments indirectly through simulation.

X-선 회절에 의한 SS41 불림재와 M.E.F. 복합 조직강의 피로 파단면 해석에 관한 연구

허선철,박영철,박수영,김득진,오세욱 韓國非破壞檢査學會 1996 한국비파괴검사학회지 Vol.16 No.1

본 연구에서는 SS41 불림재와 M.E.F. 복합 조직강에 대해서 파괴 역학 파라미터와 X-선 피라미터 사이의 관계를 규명하였다. 피로 균열 진전 실험이 수행되었고, X-선 회절 방법이 피로 파단면에 적용되었다. 피로 파단면을 순차적으로 전해 연마하면서 깊이에 따른 X-선 파라미터(잔류응력, 반가폭)의 변화를 관찰하였다. 최대 소성역 깊이 Wy는 SS41 불림재에서는 반가폭의 분포로, M.E.F. 복합 조직강에 대해서는 잔류 응력의 분포로 결정할 수 있었다. 피로 파단면의 깊이 방향에 따른 X-선 파라미터의 분포로부터 Kmax와 Wy의 관계식이 실험 데이터로부터 얻어지고, 이 식들로부터 Kmax은 Wy의 측정에 의하여 추정되어질 수 있다. This study verified the relationship between fracture mechanics parameters and X-ray parameters for normalized SS41 steel with homogeneous crystal structure and M.E.F. dual phase steel(martensite encapsulated islands of ferrite). The fatigue crack propagation test were carried out and X-ray diffraction technique was applied to fatigue fractured surface. The change in X-ray parameters(residual stress, half-value breadth) according to the depth of fatigue fractured surface were investigated. The depth of maximum plastic zone, Wy, were determined on the basis of the distribution of the half-value breadth for normalized SS41 steel and that of the residual stress for M.E.F. dual phase steel. Kmax could be estimated by the measurement of Wy.