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UV/H<sub>2</sub>O<sub>2</sub>를 이용한 2,4-DCP의 산화에 NO<sub>3</sub><sup>-</sup> 이온이 미치는 영향
박재한,이지영,안윤희,문태훈,임성균,고광백,Park, Jae Han,Lee, Ji Yong,Ahn, Yoon Hee,Moon, Tae Hoon,Yim, Sung Kyun,Ko, Kwang Baik 한국물환경학회 2007 한국물환경학회지 Vol.23 No.3
The Advanced Oxidation Process (AOP) is being increasingly used to oxidize complex organic constituents in treated effluents from domestic wastewater treatment plants. Generally, ${NO_3}^--N$ concentrations ranges between 5 and 8 mg/L for biologically well-treated effluents. However, nitrate ions, ${NO_3}^-$, affects on oxidation as not only a well-known strong absorber of UV light below 250 nm of wavelength but also as an OH radical scavenger. The objective of this study was to evaluate the AOP systems for degradation of 2,4-DCP, and to delineate the effect of nitrate ions on UV oxidation of 2,4-DCP by conducting a bench-scale operation at various reaction times and initial concentrations of $H_2O_2$. The experimental results indicated that 2,4-DCP could be completely oxidized by $UV/H_2O_2$ process with an initial $H_2O_2$ concentration of 20 mg/L at a retention time of 1.0 min or longer. Nitrate ions did not show any adverse effect on 2,4-DCP oxidation at this high $H_2O_2$ concentration, and the practical initial $H_2O_2$ concentration and reaction time for the 80% oxidation turned out to be 5 mg/L and 1.0 min, respectively.
Ti-6Al-4V 합금의 알칼리 및 열처리가 인산칼슘 침착에 미치는 영향
박재한,임기정,김상목,김병옥,한경윤,Park, Jae-Han,Lim, Ki-Jung,Kim, Sang-Mok,Kim, Byung-Ock,Han, Kyung-Yoon 대한치주과학회 2000 Journal of Periodontal & Implant Science Vol.30 No.1
The precipitation of calcium phosphate on implant surface has been known to accelerate osseointegration and to enhance osseous adaptation. The present study was performed to examine whether the precipitation of calcium phosphate on Ti-6Al-4V alloy could be affected by the immersion in NaOH solution and heat treatment. Ti-6Al-4V alloy plates of $15{\times}3.5{\times}1mm$ in dimension were polished sequentially from #240 to #2,000 emery paper and one surface of each specimen was additionally polished with $0.1{\mu}m$ alumina paste. Polished specimens were soaked in various concentrations of NaOH solution(0.1, 1.0, 3.0, 5.0, 7.0, 10.0 M) at $60^{\circ}C$ for 24 hours for alkali treatment, and 5.0 M NaOH treated specimens were heated for 1 hour at each temperature of 400, 500, 600, 700, $800^{\circ}C$. After the alkali and heat treatments, specimens were soaked in the Hank's solution with pH 7.4 at $36.5^{\circ}C$ for 30days.The surface ingredient change of Ti-6Al-4V alloy was evaluated by thin-film X-ray diffractometer(TF-XRD) and the surface microstructure was observed by scanning electron microscope(SEM), and the elements of surface were analyzed by X-ray photoelectron spectroscopy(XPS). The results were obtained as follows ; 1. The precipitation of calcium phosphate on Ti-6Al-4V alloy was accelerated by the immersion in NaOH solution and heat treatment. 2. In Alkali treatment for the precipitation of calcium phosphate on Ti-6Al-4V alloy, the optimal concentration of NaOH solution was 5.0 M. 3. In heat treatment after alkali treatment in 5.0 M NaOH solution, the crystal formation on alloy surface was enhanced by increasing temperature. In heat treated alloys at $600^{\circ}C$, latticed structure and prominences of calcium phosphate layer were most dense. On heat treated alloy surface at the higher temperature(${\geq}700^{\circ}C$), main crystal form was titanium oxide rather than apatite. The above results suggested that the precipitation of calcium phosphate on the surface of Ti-6Al-4V alloy could be induced by alkali treatment in 5.0 M-NaOH solution and by heat treatment at $600^{\circ}C$.
국내외 친환경 건축물 인증제도의 변천과정 고찰을 통한 G-SEED의 평가 체계 개선방안 연구 - 공동주택을 중심으로 -
박재한,차기욱,홍원화,Park, Jae-Han,Cha, Gi-Wook,Hong, Won-Hwa 한국주거학회 2013 한국주거학회 논문집 Vol.24 No.5
The seriousness of greenhouse gas exhaustions and energy use of the building has increased, the world is making an effort with many requests and the consultation for sustainable development. For this reason, Green Building Certification Criteria has been implemented to reduce environmental load, high-performance and environmentally friendly in the United States, the United Kingdom and Germany. In response to the global trend like this, the Korean Government has induced the eco-friendly construction and sustainable development to implement the G-SEED (Green Building Certification Criteria of Korea) in 2002. However, in spite of the many authentication result, G-SEED has been pointed out that it needs for improve in the evaluation system of Apartment sector which accounts for more than 40% of the authentication. Therefore, the purpose of this study is to suggest improvements in the evaluation system. To achieve this, this study have selected for LEED, BREEAM, DGNB of comparison target, drawn improvements through comparing transition process in G-SEED.
서비스 로봇 환경에서의 조명 영향에 강인한 시각 서술자 기반 물체인식 방법
박재한(Jae-Han Park),고재한(Jaehan Koh),박경욱(Kyung-Wook Park),백승호(Seung-Ho Baeg),백문홍(Moon-Hong Baeg) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
Recognizing objects of a robot reliably from camera images in a natural environment has been one of the crucial challenges in robot vision. To identify objects from robot camera, we propose an object recognition algorithm on the basis of visual descriptors. The algorithm works robustly under various constraints such as different lighting conditions and the different distances between the robot and the target object. Our object recognition process consists of the following steps. Firstly, Dominant color information is extracted by using Dominant Color Descriptor(DCD) of MPEG-7 standard. Color information is transformed through Gaussian Color Model to minimize the external environmental effects on the image including lighting. Then, after the color transformation, the robot calculates the distance between the target and itself with the dominant color information downloaded from the object description database and the camera images, the filter out pixels having values greater than a threshold. A region of interest is formed after a distance threshold is satisfied. To evaluate the performance of our algorithm, experiments are conducted with six beverage cans that are typical of real-world objects.
실험 계획법에 기반한 키넥트 센서의 최적 깊이 캘리브레이션 방법
박재한(Jae-Han Park),배지훈(Ji-Hum Bae),백문홍(Moon-Hong Baeg) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.11
Depth calibration is a procedure for finding the conversion function that maps disparity data from a depth-sensing camera to actual distance information. In this paper, we present an optimal depth calibration method for Kinect<SUP>TM</SUP> sensors based on an experimental design and convex optimization. The proposed method, which utilizes multiple measurements from only two points, suggests a simplified calibration procedure. The confidence ellipsoids obtained from a series of simulations confirm that a simpler procedure produces a more reliable calibration function.
박재한(Jae Han Park),신수용(Soo Young Shin) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
본 논문은 관심 있는 객체를 탐지하는 방법에 대한 새로운 접근법을 제시한다. 기존의 객체 추적 시스템과 달리, 이 제안은 관심 객체의 여러 가지 특성을 탐지하고, 관심 대상의 범위를 줄이기 위하여 소거 방법을 사용한다. 기존의 방법들은 관심 객체의 전체 특성을 추출하여 추적하거나 관심대상의 얼굴을 식별하여 추적하는 방법을 사용했다. 내가 제안한 방법은 객체를 추적하기 위한 많은 재식별 방법과는 다르게, 이 방법은 객체를 놓쳤을 때 객체를 다시 감지하는 것이 훨씬 더 간단하다.
백오프 통계정보를 이용한 미등록어 포함 복합명사의 분해
박재한(Jae-Han Park),김명선(Myoung-Sun Kim),노대욱(Dae-Wook Rho),나동열(Dong-Yul Ra) 한국정보과학회 언어공학연구회 2004 한국정보과학회 언어공학연구회 학술발표 논문집 Vol.16 No.1
본 논문에서는 백오프 통계 정보를 이용하여 일반적인 복합명사 뿐만 아니라 외래어 미등록어를 포함한 복합명사도 잘 분해하는방법을 제안한다. 본 시스템은 입력으로 형태소분석기가 내주는 많은 분석 후보들을 받는다. 단음절 명사를 포함한 분석 후보도 포함되므로 입력 분석 후보의 수는 대단히 많게 된다. 본 모듈의 주요 작업은 이 중에서 가장 좋은 분석후보를 선택하는 것이 된다. 미등록어가 포함된 경우 이에 부합되는 분석 후보를 잘 선택하는 시스템의 개발을 목표로 한다. 이를 위해서 본 시스템에서 사용하는 주요 정보는 단어간 어휘 바이그램 통계정보이다. 또한 외래어 미등록어의 인식 정확성을 높이기 위해 음절 바이그램 정보도 이용한다. 통계 정보는 대량의 품사 태깅 말뭉치에서 추출하였다. 데이터 부족 문제를 해소하기 위해서 우리는 백오프(back-off) 평탄화(smoothing) 기법을 이용하였다. 미등록어가 포함된 복합명사의 분석 후보의 수를 줄이기 위한 기술도 연구하였다.