Taguchi 실험 계획법에 의한 CH₃SH 반도체 악취 가스 센서의 개발

김선태,최일환 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.6

In this study, a thick-film semiconductor odor gas sensor for the detection of CH₃SH was developed using SnO₂ as the main substrate and was Investigated in terms of Its sensitivity and reaction time In the process of manufacturing the sensor, Tagucht's design of experiment (DOE) was applied to analyze the effects of a variety of parameters, including the substrate, the additives and the fabrication conditions, systematically and effectively Eight trials or experiments could be possible using the 2^7 orthogonal array for the seven factors and two levels or condition, which originally demands 128 trials of experiments without DOE The additives of Sb₂O_(5) and PdCl₂ With the H₂PtCl_(6)ㆍ6H₂O catalyst were appeared to be Important factors to Improve the sensitivity, and CuO, Sb₂O_(5) V₂O_(5) and PdO were less Important In addition, T1O₂, V₂O5 and PdO would Improve the reaction time of a sensor, and CuO, Sb₂O5, PdCl₂ and H₂PtCl_(6)ㆍ6H₂O were negligible Being evaluated simultaneously in terms of both sensitivity and reaction time, the sensor showed the higher performance with the addition of T₁O₂ and PdO, but the opposite results with the addition of CuO, V₂O_(5), Sb₂O_(5) and PdCl₂ The amount of additives were superior in the case of 1 % than 4% H₂PtCl_(6)ㆍ6H₂O would play an important role for the increase of sensor performance as a catalyst

GPS 를 활용한 무인 비행체의 자율비행에 관한 연구

오성남,이검수,김갑일,강환일 明知大學校 産業技術硏究所 2009 産業技術硏究所論文集 Vol.28 No.-

In this paper, we describes a study on autonomic flight of UAV(Unmanned Aerial Vehicle) that is equipped with GPS(Global Positioning System). This research have used a quarter vehicle that has the form of rotary-wing aircraft. The quarter vehicle is unstable because it flies by lift forces from 4 propellers and turning repelling power. UAV flight control system applied inertia sensors to keep stable position and balance of the vehicle. GPS supplies correct position data that decides position, speed and direction of aircraft. With the help of GPS, the autonomic flight can be successful. Also, small size magneto-resistive sensors(MRS) improves the direction information of GPS. In this paper we propose a GPS application method and autonomic flight algorithm for coordinate calculation.

1:N 무선 통신 기반의 이동로봇 위치 추종에 관한 연구

이검수,오성남,김갑일,강환일 明知大學校 産業技術硏究所 2009 産業技術硏究所論文集 Vol.28 No.-

In this paper, we research about Multi.agent control mobile robots using the GPS and Bluetooth modules. In this system, we used the sign board model whieh transmits the information to unspecified robots. And also for Multi-Agent system, we made three mobile robots and used GPS and Bluetooth modules for robot's coordinate awareness and search direction. All mobile robots are installed with GPS and Bluetooth modules, receive Master-mobile’s robot position coordinates from GPS and then transfer to all mobile robots located within the communication possibility area of the Bluetooth module. Each Slave-mobile robots receive the position coordinate from Master -mobile robot and calculate distance and direction between eaeh robot. We implement the transfer algorithm of Multi-agent robots, manufacture mobile robots for Multi-agent control and propose the method of 1:N real time communication. Finally , we calculate the distance between the positions of each robot using the GPS data.

Toxicokinetics of CJ-11555: Gender Difference and M inim um Accum ulation

Kim Young Hoon,Kim II Hwan,Noh Hyun Jung,Choi Jae Mook,Kim Deog Yeor,Park Jie Eun,Lee Sung Hak,Kim Taekrho,Kim Jin Wan 대한약학회 2003 大韓藥學會 總會 및 學術大會 Vol.2003 No.2

급성 췌장염 환자에서 양성자펌프억제제의 효과-예비 연구

유정환 ( Jeong Hwan Yoo ),권창일 ( Chang Ii Kwon ),유광호 ( Kwang Ho Yoo ),윤해리 ( Har Ry Yoon ),김원희 ( Won Hee Kim ),고광현 ( Kwang Hyun Ko ),홍성표 ( Sung Pyo Hong ),박필원 ( Pil Won Park ) 대한소화기학회 2012 대한소화기학회지 Vol.60 No.6

목적: 급성 췌장염의 발생에는 다양한 기전이 관여하고 있고 활성산소가 중요한 역할을 한다고 알려져 있다. 널리 사용되고 있는 양성자펌프억제제인 pantoprazole은 췌장의 소화효소의 분비를 간접적으로 억제하는 작용 외에도 활성산소에 대한 항산화효과와 항염증효과를 가지고 있다. 이번 연구는 이런 pantoprazole의 사용이 급성 췌장염의 임상 경과에 어떤 영향을 미치는지 알아보고자 하였다. 대상 및 방법: 2011년 3월부터 2012년 5월까지 급성 췌장염으로 입원한 환자 중 위식도 역류질환이 동반된 40명을 대상으로 전향적 무작위 배정으로 연구하였다. 20명씩 두 군으로 나누어 한 군에서는 pantoprazole을 투여하였고 다른 군에서는 사용하지 않았다. Pantoprazole은 금식기간 동안에는 하루 2번 40 mg을 정맥 내로 투여하였고 식사 시작 후에는 하루 2번 40 mg을 퇴원할 때까지 경구 투여하였다. 다른 급성 췌장염의 치료는 양 군에서 동일하게 사용되었다. 혈청 amylase, lipase 등의 혈액학적 검사와 APACHE II 점수를 연속적으로 측정하였고 입원 당시 복부 전산화단 층촬영을 시행하여 CT 중증도 지수를 측정하였다. 결과: 양 군 간에 기준 특성, 혈액검사, APACHE II 점수, CT 중증도 지수에서 유의한 차이를 보이지 않았다. Pantoprazole 투여군에서 평균 입원일은 7.4일, 경구 섭취까지 걸린 시간은 69.0시간, 복통이 호전될 때까지 걸린 시간은 59.7시간이었다. APACHE II 점수는 입원 당시에는 3.15이었고 퇴원 시에는 2.35이었다. Pantoprazole을 투여하지 않은 군에서는 평균 입원일은 7.6일, 경구 섭취까지 걸린 시간은 71.4시간, 복통이 호전될 때까지 걸린 시간은 61.8시간이었다. APACHE II 점수는 입원 당시에는 4.4이었고 퇴원 시에는 2.85이었다. 모두 양 군에서 통계학적으로 유의한 차이를 보이지 않았다. 결론: Pantoprazole을 이용한 치료가 급성 췌장염의 경과에 어떤 개선도 보이지 못했다. 그러나 예비 연구라는 점을 고려했을 때, 더 큰 규모의 전향적 무작위 배정 임상연구로 검증이 필요하겠다. Background/Aims: Oxygen free radicals play an important role in acute pancreatitis. Pantoprazole as a proton pump inhibitor (PPI) has pancreatic anti-secretory effect and a pronounced inhibitory reactivity towards hydroxyl radicals. The objective of the study was to investigate the effect of pantoprazole on the course of acute pancreatitis. Methods: We conducted a prospective randomized trial involving 40 patients with acute pancreatitis. Patients were divided into two groups. One group received PPI and the other group did not receive PPI. In the PPI group, patients received pantoprazole 40 mg intravenously twice a day for fasting time, and then 40 mg orally twice a day until discharge. Results: There were no significant differences in baseline characteristics and laboratory markers between two groups. In the pantoprazole group, mean hospital stay was 7.4 days, time to start oral intake was 69.0 hours, and time to pain relief was 59.7 hours. Acute physiology and chronic health evaluation (APACHE) II score was 3.15 at admission day and 2.35 at discharge. On the other hand, in the non-pantoprazole group, mean hospital stay was 7.6 days, time taken to start oral intake was 71.4 hours, and time taken to pain relief was 61.8 hours. APACHE II score was 4.4 at admission and 2.85 at discharge. However, there were no significant differences between two groups. Conclusions: Treatment with pantoprazole did not have influence on the clinical course of acute pancreatitis. But, considering it was a pilot study, large scale prospective trials will be needed.

Ceramic molar crown reproducibility by digital workflow manufacturing: An in vitro study

II-Do Jeong,Woong-Chul Kim,Jinyoung Park,Chong-Myeong Kim,Ji-Hwan Kim 대한치과보철학회 2017 The Journal of Advanced Prosthodontics Vol.9 No.4

PURPOSE. This in vitro study aimed to analyze and compare the reproducibility of zirconia and lithium disilicate crowns manufactured by digital workflow. MATERIALS AND METHODS. A typodont model with a prepped upper first molar was set in a phantom head, and a digital impression was obtained with a video intraoral scanner (CEREC Omnicam; Sirona GmbH), from which a single crown was designed and manufactured with CAD/CAM into a zirconia crown and lithium disilicate crown (n=12). Reproducibility of each crown was quantitatively retrieved by superimposing the digitized data of the crown in 3D inspection software, and differences were graphically mapped in color. Areas with large differences were analyzed with digital microscopy. Mean quadratic deviations (RMS) quantitatively obtained from each ceramic group were statistically analyzed with Student’s t-test (α=.05). RESULTS. The RMS value of lithium disilicate crown was 29.2 (4.1) µm and 17.6 (5.5) µm on the outer and inner surfaces, respectively, whereas these values were 18.6 (2.0) µm and 20.6 (5.1) µm for the zirconia crown. Reproducibility of zirconia and lithium disilicate crowns had a statistically significant difference only on the outer surface (P<.001). The outer surface of lithium disilicate crown showed over-contouring on the buccal surface and under-contouring on the inner occlusal surface. The outer surface of zirconia crown showed both over- and under-contouring on the buccal surface, and the inner surface showed under-contouring in the marginal areas. CONCLUSION. Restoration manufacturing by digital workflow will enhance the reproducibility of zirconia single crowns more than that of lithium disilicate single crowns.

태양전지의 Cell 레벨에서의 장기 신뢰성에 관한 연구

김경환(Kim Koung-Hwan),전유재(Jeon Yu-Jae),김도석(Kim Do-seok),조일제(Jo II-Jea),신영의(Shin Young-Eui) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3

본 연구는 고온고습 시험을 통하여 Cell 레벨에서의 표면관찰 및 효율저하를 분석하였다. 고온고습 시험 조건은 KS C IEC-61215에서 제시한 PV module하의 조건을 이용하여 온도 85℃, 습도 85% 조건하에 1000시간 동안 수행하였다. 고온고습 시험에 따라 효율에 직접적인 영향을 줄 수 있는 이상 유·무를 Cell 표면을 통해 분석한 결과, 고온고습 시험 수행 중 부분적으로 변색되는 것을 확인하였다. 고온고습 시험 전 단결정 Cell의 효율은 17.74% 였으며, 1000시간 수행 후 15.63%으로 11.89%의 감소율을 보였다. 다결정 Cell의 시험 전 효율은 15.46%, 1000시간 수행 후 효율은 14.02%로 9.1%의 감소율을 보였다. 경년 시 나타나는 전기적 특성을 분석하기 위해 FF(Fill Factor)값을 분석한 결과, 고온고습 시험 전 단결정 Cell은 78.71%에서 75.01%로 4.7%의 감소율을 보였으며, 다결정 Cell은 78.10 %에서 76.66%로 1.84%의 감소율을 보였다. 효율 및 FF값에서 단결정 Cell이 다결정 Cell보다 감소율이 큰 것으로 분석되었으며, 이는 단결정 Cell이 외부 환경에서 더욱 크게 작용하여 효율저하에 영향을 주었다고 판단된다.

Preparation and Characterization of Precursor Solution for a Hard Coating Silica Film

(sun II KIm),(Sung Dong Cho),(JIn Hwan Kim) 한국공업화학회 2000 한국공업화학회 연구논문 초록집 Vol.2000 No.0

N/A N/A

공기어를 이용한 사회 문제에 대한 관심의 추이 분석 -2000~2009년 신문기사를 중심으로-

김일환 ( Ii Hwan Kim ),강범모 ( Beom Mo Kang ),김흥규 ( Heung Gyu Kim ) 경희대학교 인문학연구원 2012 인문학연구 Vol.0 No.21

이 연구는 2000년부터 2009년까지 4개 종합 일간지(동아, 조선, 중앙, 한겨레신문)의 신문 기사를 기반으로 구축된 [물결 21] 코퍼스로부터 한국의 사회 문제와 관련된 키워드를 추출하고 이들과 공기하는 단어들의 변화 양상을 살펴봄으로써 사회 변화의 추이를 분석해 보는 데 목적이 있다. 이를 위해 ``양극화, 빈곤, 소외, 자살, 차별``을 연도별 사용 빈도에 근거하여 사회 문제의 키워드로 선정하고 키워드와 공기어들의 관련성을 연도별 증감도를 통해 분석하였다. 특히 키워드와 관련성이 높은 단어들을 중심으로 이들의 변화 양상을 살핌으로써 사회 문제에 대한 사회적 관심사의 변화를 규명해 보았다. 그 결과 <양극화>와 공기어들은 2006년에 빈도와 관련성이 급격히 증가했다가 감소하는 특성을 보였으며, <빈곤>의 공기어 중에는 ``아동, 여성`` 등이 높은 관심을 받았다. <소외>는 퇴치해야 할 사회 문제로 많은 관심을 보였는데 ``이웃, 장애인, 여성`` 등이 크게 주목을 받았다. <자살>의 공기어로는 ``노인, 청소년, 가족`` 등이 높은 관련성을 보이며 증가하였고 자살의 요인과 관련하여 ``빚``과 같이 경제적인 것보다는 ``우울증, 스트레스`` 등의 정신적 요인의 관련성이 높아졌다. <차별>의 공기어로는 ``장애인, 비정규직, 노동자``가 큰 관심을 받았고 2000년대 후반에는 ``다문화, 소수자`` 등도 급격히 관심이 증가하였다. 이러한 연구는 대규모의 실제 신문 기사에 나타난 어휘의 사용 분포를 기반으로 했을 뿐 아니라 키워드와 공기어의 증감 양상을 통계적 방법을 활용하여 분석함으로써 사회 문제에 대한 관심의 추이를 객관적으로 구명해 보았다는 데에 의의가 있다. Newspapers reflect social situations and interests at specific times. Accordingly, the newspapers can provide us with appropriate clues to capture trends of social change. This study aims to analyze trends of social problems by observing keywords and their associated words extracted from a large-scale newspaper corpus, Trends 21. The Trends 21 corpus is a collection of four major Korean daily and national newspapers (Chosun, Dong-a, Joongang, and Hankyoreh) issued from the year 2000 and it has developed over a long period of time. In order to analyze social change, we propose that a statistical method such as a t-score should be introduced for selecting keywords and extracting their associated words appearing in the same paragraph. In addition, we employ Mann Kendall`s measurement for variation in order to apprehend patterns of the increase/decrease of associated words explicitly. We extract seven keywords related to social issues, ``polarization, poverty, destitution, alienation, suicide, violence, discrimination, addiction`` as well as their various associated words, and then suggest trends of social change reflected in the newspapers. The main contribution of this research can be summarized as follows. First, this research captures trends of changes of social problems which are expressed through language uses shown in large-scale authentic data. Second, we employ statistical information like t-scores and Mann Kendall`s measurement analyze keywords and their associated words.

Ceramic molar crown reproducibility by digital workflow manufacturing: An in vitro study

Jeong, II-Do,Kim, Woong-Chul,Park, Jinyoung,Kim, Chong-Myeong,Kim, Ji-Hwan The Korean Academy of Prosthodonitics 2017 The Journal of Advanced Prosthodontics Vol.9 No.4

PURPOSE. This in vitro study aimed to analyze and compare the reproducibility of zirconia and lithium disilicate crowns manufactured by digital workflow. MATERIALS AND METHODS. A typodont model with a prepped upper first molar was set in a phantom head, and a digital impression was obtained with a video intraoral scanner (CEREC Omnicam; Sirona GmbH), from which a single crown was designed and manufactured with CAD/CAM into a zirconia crown and lithium disilicate crown (n=12). Reproducibility of each crown was quantitatively retrieved by superimposing the digitized data of the crown in 3D inspection software, and differences were graphically mapped in color. Areas with large differences were analyzed with digital microscopy. Mean quadratic deviations (RMS) quantitatively obtained from each ceramic group were statistically analyzed with Student's t-test (${\alpha}=.05$). RESULTS. The RMS value of lithium disilicate crown was $29.2\;(4.1){\mu}m$ and $17.6\;(5.5){\mu}m$ on the outer and inner surfaces, respectively, whereas these values were $18.6\;(2.0){\mu}m$ and $20.6\;(5.1){\mu}m$ for the zirconia crown. Reproducibility of zirconia and lithium disilicate crowns had a statistically significant difference only on the outer surface (P<.001). The outer surface of lithium disilicate crown showed over-contouring on the buccal surface and under-contouring on the inner occlusal surface. The outer surface of zirconia crown showed both over- and under-contouring on the buccal surface, and the inner surface showed under-contouring in the marginal areas. CONCLUSION. Restoration manufacturing by digital workflow will enhance the reproducibility of zirconia single crowns more than that of lithium disilicate single crowns.