펄스레이저 증착법에 의해 성장된 ZnO 박막의 특성 관찰

최재완,지현진,정창욱,이보화,김규태,Choi, Jae-wan,Ji, Hyun-jin,Jung, Chang-Uk,Lee, Bo-Hwa,Kim, Gyu-Tae 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.2

The semiconducting material of ZnO in II-VI group was well known as its good application for photo electronics, chemical sensors and field effect transistors due to the remarkable optical properties with wide energy band gap and great ionic reactivities. Up to now the growth of a good quality of ZnO film has been issued for better performances. Even though there were many deposition methods for making ZnO films, pulse laser deposition methods have been preferred for high crystalline films. In this report, the ZnO film was also created by pulsed laser deposition technique which also showed high crystalinity. By controlling several factors when deposited, it was investigated that the optimal condition for ZnO film formation. Mainly, oxygen partial pressures and growth temperatures were changed when ZnO films were synthesized and followed the characterization by HRXRD and AFM.

흑백화상처리에 의한 씨감자 조직배양 공정의 생육상태 모니터링

최재완,정광조,문정기 ( J . W . Choi,G . J . Chung,J . G . Moon ) 한국농업기계학회 1997 한국농업기계학회 학술발표논문집 Vol.2 No.1

대사증후군에 대한 사상체질별 허리둘레 및 체질량지수의 절단값에 대한 연구

최재완,유준상,Choi, Jae-Wan,Yu, Jun-Sang 사상체질의학회 2014 사상체질의학회지 Vol.26 No.4

Objectives This study was performed to investigate the cut-off values of abdominal circumference and Body Mass Index(BMI) according to Sasang Constitution. Methods A total of 1,773 persons, namely 440 male people and 1,333 female people, in ages from 40 to 69 years old, participated in this research. They are all included in the community based Genomic cohort in Wonju in years from 2006 to 2013. The diagnostic criteria of metabolic syndrome was used followed by the National Cholesterol Education Program in Adult Treatment Panel III (NCEP ATP III) and Asian pacific guideline for only abdominal obesity. Results The prevalence of metabolic syndrome was 34.8% for men and 37.6% for women in this research. Taeeumin was the highly significant risk type for the metabolic syndrome in both sexes. Cut-off values of abdominal circumference were 88.3 cm in men, 80.3 cm in women, and cut-off values of BMI were $24.2kg/m^2$ in men and $25.3kg/m^2$ in women. For men, cut-off values of abdominal circumference were 79.5cm in Soyangin, 88.8 cm in Taeeumin and 79.5 cm in Soeumin, and cut-off values of BMI were $23.2kg/m^2$ in Soyangin, $25.6kg/m^2$ in Taeeumin and $20.6kg/m^2$ in Soeumin. For women, cut-off values of abdominal circumference were 76.3 cm in Soyangin, 80.3 cm in Taeeumin and 76.8 cm in Soeumin, and cut-off values of BMI were $22.4kg/m^2$ in Soyangin, $24.9kg/m^2$ in Taeeumin and $21.3kg/m^2$ in Soeumin. Conclusions Although 90 cm in men, 80 cm in women as an Asian pacific guideline were regarded as quite approximate to the mean value of abdominal circumference and $25kg/m^2$ to BMI. But if the results could be allocated in terms of the Sasang constitutional method, the cut-off values for Soyangin and Soeumin should be lowered than now.

다양한 강우강도 및 패턴에 따른 WEPP 모형의 유출?첨두유출?토양유실량 평가

최재완,류지철,김익재,임경재,Choi, Jae-Wan,Ryu, Ji-Chul,Kim, Ik-Jae,Lim, Kyoung-Jae 한국수자원학회 2012 한국수자원학회논문집 Vol.45 No.8

최근 강우강도 및 패턴이 변화함에 따라 전세계적으로 토양유실이 증가하고 있다. 그 결과, 수생태계 건전성이 악화되고, 농업작물이 피해를 입어 수확량이 감소된다. 그동안 유출 및 토양유실을 예측하거나 비점오염원을 감소시키는 연구가 많이 수행되어 왔다. USLE는 수년간 토양유실을 산정하는데 사용되어왔으나, 강우강도나 패턴변화를 적용하기에는 적절하지 못했다. 물리적 기반인 WEPP 모형은 다양한 강우강도 및 패턴변화를 적용하는데 적절하다. 본 연구에서는 WEPP 모형을 이용하여 Huff의 4분위, 다양한 강우간격, 설계강우에 따른 토양유실, 유출, 첨두유출을 산정하였다. 5분간격 강우 데이터와 60분 간격 강우 데이터를 비교한 결과 토양유실은 24%, 유출은19%, 첨두유출은 16%가 차이나는 것으로 나타났다. 유출 및 토양유실이 5분 간격 강우량에서 실측치와 가장 유사한 것으로 나타나 강우데이터의 간격이 짧을수록 더 정확하게 모의할 수 있는 것으로 나타났다. Huff의 4분위를 이용하여 토양유실량, 유출량, 첨두유출량을 산정한 결과 토양유실량, 유출량, 첨두유출량 모두 3분위에서 가장 높게 발생하는 것으로 나타났다. 강원도 홍천지역 빈도별 확률강우를 이용하여 토양유실량, 유출량, 첨두유출량의 변화를 모의하였다. 2년 빈도와 300년 빈도에서 강우량은 167% 증가하였다. 유사량과 유출량, 첨두유출량은 각각 906.2%, 249.4%, 183.9% 증가하여 유사량의 증가율이 가장 큰 것으로 나타났다. 본 연구의 결과에서 보이는 바와 같이 WEPP 모형을 이용하여 향후 기후변화에 따른 유출 및 토양유실의 예측이 가능할 것으로 판단된다. Recently, changes in rainfall intensity and patterns have been causing increasing soil loss worldwide. As a result, the water ecosystem becomes worse and crops yield are reduced with soil loss and nutrient loss with it. Many studies have been proposed to estimate runoff and soil loss to predict or decrease non-point source pollution. Although the USLE has been used for many years in estimating soil losses, the USLE cannot reflect effects on soil loss of changes in rainfall intensity and patterns. The WEPP, physically based model, is capable of predicting soil loss and runoff using various rainfall intensity. In this study, the WEPP model was simulated for sediment yield, runoff and peak runoff using data of 5, 10, 30, 60 minute term rainfall, Huff's method and design rainfall. In case of rainfall interval of 5 minutes and 60 minutes, the sediment and runoff values decreased by 24% and 19%, respectively. The peak rate runoff values decreased by 16% when rainfall interval changed from 5 minutes to 60 minutes, indicating the peak rate runoff values are affected by rainfall intensity to some degrees. As a result of simulating using Huff's method, all values (sediment yield, runoff, peak runoff) were found to be the greatest at third quartile. According to the analysis under various design rainfall conditions (2, 3, 5, 10, 20, 30, 50, 100, 200, 300 years frequency), sediment yield, runoff, and peak runoff of 906.2%, 249.4% and 183.9% were estimated using 2 year to 300 year frequency rainfall data.

사상체질음성분석기(四象體質音聲分析機)(PSSC)를 통한 한국인 성인남성(成人男性)의 체질별(體質別) 음향특성연구(音響特性硏究) - 단문(短文)을 중심으로 -

최재완,송학수,한동윤,조성언,왕향란,전종원,김달래,유준상,Choi, Jae-Wan,Song, Hak-Soo,Han, Dong-Youn,Cho, Sung-Eon,Wang, Hyang-Lan,Jeon, Jong-Weon,Kim, Dal-Rae,Yoo, Jun-Sang 사상체질의학회 2006 사상체질의학회지 Vol.18 No.3

1. Objectives and Methods A Study on the Characteristics of the Korean Adult Male Sound according to Sasang Constitution using PSSC with a Sentence. Sasang Constitutional Medicine(SCM) is the one of the traditional Korean Medicine. It classifies people into four categories like Taeyangin, Soyangin, Taeumin and Soeumin. The rule to classify is Appearance and Body Shape, Facial Appearance and Speech, Character and Talents and Diseases and Medications. This study was done to investigate the relationships between Voice and Sound parameters using PSSC(Phonetic System of Sasang Constitution) in a sentence. Experimental Participants were 195 Korean adult males including 1 Taeyangin, 37 Soyangin, 105 Taeumin and 52 Soeumin. Sasang Constitutional specialist used PSSC and Korean Medical Diagnosis to classify participants into four constitution. 2. Results In Pitch segment, Soyangin's Center freq.(4) was significantly high compared with Taeyangin and Taeumin groups. Soyangin's and Soeumin's Center freq.(6) was significantly high compared with Taeyangin and Taeumin groups. In APQ segment and Octave segment, there were no significant differences among four groups. In Shimmer segment, Taeumin's F Shimmer(1) and F Shimmer(2) were significantly high compared with Taeyangin and Soyangin groups. In Energy segment, Taeyangin's 2k-4k total sum, 2k-4k dev., C dev., C# dev. and D S.D. were significantly high compared with other groups. In Recording time segment, there was no significant difference among four groups. More Taeyangin cases and the other parameters are needed to determine constitution using PSSC and to make PSSC effective. 3. Conclusions From above result, there is the possibility of efficiency standard guide for constitution diagnosis by analyzation og voice.

CASI 초분광 영상 테스트 베드 자료를 활용한 표적 탐지 기법의 성능 평가

최재완(Jae-Wan Choi),왕표(Biao Wang),노신택(Sin-Taek Noh),최도연(Do-Yoen Choi),최석근(Seok-Keun Choi) 대한공간정보학회 2014 한국지형공간정보학회 학술대회 Vol.2014 No.5

Guided Filter를 이용한 교차융합영상 기반 KOMPSAT-3 위성영상의 무감독변화탐지

최재완 ( Jaewan Choi ),박홍련 ( Honglyun Park ),김동학 ( Donghak Kim ),최석근 ( Seokkeun Choi ) 대한원격탐사학회 2018 大韓遠隔探査學會誌 Vol.34 No.5

GF(Guided Filtering)는 영상에 존재하는 에지 정보를 보존하면서 잡음을 효과적으로 제거하기 위한 대표적인 영상처리 기법이다. 본 연구에서는 GF를 이용하여 다시기 KOMPSAT-3 위성영상에 대한 무감독 변화 탐지 기법을 수행하고, 이에 대한 성능을 평가하고자 하였다. GF를 변화탐지에 활용하기 위하여, GF를 기반으로 교차융합영상을 생성하였으며, 생성된 교차융합영상에 CVA(Change Vector Analysis) 기법을 적용하여 변화 지역을 추정하고자 하였다. KOMPSAT-3 위성영상을 이용한 실험결과, 본 연구에서 제안한 기법이 기존의 영상융합 기법을 기반으로 하는 CVA 결과들과 비교하여 효과적으로 변화지역을 탐지하는 데에 활용할 수 있음을 확인하였다. GF (Guided Filtering) is a representative image processing technique to effectively remove noise while preserving edge information in the digital image. In this paper, we proposed a unsupervised change detection method for the KOMPSAT-3 satellite image using the GF and evaluated its performance. In order to utilize GF for the unsupervised change detection, cross-sharpened images were generated based on GF, and CVA (Change Vector Analysis) was applied to the generated cross-sharpened images to extract the changed area in the multitemporal satellite imagery. Experimental results using KOMPSAT-3 satellite images showed that the proposed method can be effectively used to detect changed regions compared with CVA results based on existing cross-sharpened images.

< 전시-P-02 > 공주 마곡사 대웅보전 수종 연구

최재완 ( Jae Wan Choi ),박정혜 ( Jung Hae Park ),김수철 ( Soo Chul Kim ) 한국목재공학회 2018 한국목재공학회 학술발표논문집 Vol.2018 No.2

기복 변위 및 변화 지역에 의한 영상 융합 결과의 영향 분석

최재완(Choi, Jae Wan),변영기(Byun, Young Gi) 한국측량학회 2012 한국측량학회 학술대회자료집 Vol.2012 No.4

수정된 영상 유도 기법을 통한 융합영상의 분광정보 향상 알고리즘

최재완(Choi Jae Wan),김형태(Kim Hyung Tae) 대한공간정보학회 2008 대한공간정보학회지 Vol.16 No.3

IKONOS-2, QuickBird, KOMPSAT-2와 같은 고해상도 위성영상은 높은 공간해상도의 흑백영상과 멀티스펙트럴 영상을 동시에 제공하고 있다. 영상융합은 서로 다른 공간, 분광해상도를 가지는 영상을 이용하여 두 개의 장점을 모두 가지는 영상으로 재구성하는 것을 의미하며 위성영상을 영상의 시각화, 개체 추출 등에 더욱 효과적으로 사용할 수 있도록 한다는 점에서 중요한 연구분야이다. 이를 위해 많은 영상융합 알고리즘이 제안되었지만, 대부분의 알고리즘들은 융합 후에 원 멀티스펙트럴 영상의 분광정보를 효과적으로 보존하지 못하는 문제점을 가지고 있다. 이러한 문제점을 해결하기 위하여 본 논문에서는 수정된 영상 유도 기법을 통하여 융합영상의 분광왜곡량을 줄이는 알고리즘을 제안하였다. 원 멀티스펙트럴 영상과 해상도를 낮춘 융합영상과의 비교 분석을 통하여 융합영상의 분광 정보 왜곡량을 보정하도록 유도기법을 조정하였다. QuickBird 영상에 적용한 결과, 다양한 융합영상들이 본 알고리즘을 적용할 경우에 분광왜곡량이 줄어드는 것을 확인할 수 있었다. High-spatial resolution remote sensing satellites (IKONOS-2, QuickBird and KOMPSAT-2) have provided low-spatial resolution multispectral images and high-spatial resolution panchromatic images. Image fusion or Pan-sharpening is a very important in that it aims at using a satellite image with various applications such as visualization and feature extraction through combining images that have a different spectral and spatial resolution. Many image fusion algorithms are proposed, most methods could not preserve the spectral information of original multispectral image after image fusion. In order to solve this problem, modified induction technique which reduce the spectral distortion of fused image is developed. The spectral distortion is adjusted by the comparison between the spatially degraded pan-sharpened image and original multispectral image and our algorithm is evaluated by QuickBird satellite imagery. In the experiment, pan-sharpened image by various methods can reduce spectral distortion when our algorithm is applied to the fused images.