당뇨병 환자의 치주건강 상태에 대한 임상적 연구

김현섭,김병옥,한경윤,Kim, Hyun-Sub,Kim, Byung-Ok,Han, Kyung-Yoon 대한치주과학회 1993 Journal of Periodontal & Implant Science Vol.23 No.1

The purpose of the this study was to research the interrelationship of periodontal status and patient's age between diabetic group and non-diabetic group and compare that of periodontal status according to the blood sugar level and duration of diabetics. The participants of this study were 52 diabetic patients and 51 non-diabetic patients. The diabetic group and non-diabetic group were further divided into four subgroups according to the age(under 35 years old, 36 - 45 years old, 46 - 55 years old, over 56 years old) and the diabetic group was further divided into three subgroups according to the duration of diabetics (under 5 years, 6 - 10 years, over 11 years) and blood sugar level(under 140mg/100ml, 140-200mg/100ml, over 200mg /100ml), respectively. Author evaluated such periodontal status as plaque index and calculus index, gingival lndex, loss of attachment, papillary bleeding index, tooth mobility and missing teeth, and then data was statistically analyzed by SPSS/PC+ using ANOVA, respectively. The results were as follows: 1. The mean value of plaque index, gingival index, loss of attachment, papillary bleeding index, tooth mobility and missing teeth of diabetic patients were significantly higher than that of non-diabetic patients, respectively(p <0.01, p<0.01, p<0.01, p<0.01, p<0.001, p<0.001), but there was no significant difference between diabetic group and non-diabetic group in calculus index(P>0.05). 2. According to the increase of age, loss of attachment and missing teeth were increased in both group, and correlation of each subgroup was statistically significant, respectively(p<0.05, p<0.001). 3. According to the elevation of blood sugar level of diabetics, plaque index, gingival index, loss of attachment, papillary bleeding index, tooth mobility and missing teeth were increased in diabetic group, and correlation of each subgroup was statistically significant, respectively (p<0.05, p<0.05, p<0.05, p<0.05, p<0.001, p<0.001). 4. According to the duration of diabetics, plaque index, gingival index, loss of attachment, papillary bleeding index, tooth mobility and missing teeth were increased in diabetic group, and correlation of each subgroup was statistically significant, respectively(p<0.05, p<0.05, p<0.05, p<0.05, p<0.001, p<0.001).

NH₃ 연료 사용 후 배출되는 NOx 제거를 위한 NH₃-SCR 촉매 기술

김현섭 ( Hyun Sub Kim ),김도희 ( Do Heui Kim ) 한국공업화학회 2024 공업화학전망 Vol.27 No.1

온실가스를 배출하여 이상기후 현상을 일으키는 화석 연료를 대체하기 위해 친환경적인 NH₃를 활용하고자 하는 노력이 지속되고 있다. NH₃를 연료로 활용하면 CO₂를 배출하지 않지만, 연료 중에 포함된 N 성분이 공기 중의 O₂와 반응하여 과량의 NOx가 발생하게 된다. 현재 상용화 되어있는 NOx를 제거하는 가장 효율적이고 경제적인 방법 중 하나는 NH3를 활용한 선택적 촉매 환원(NH₃-SCR) 방법이다. 그러나 상용 V₂O₅-WO₃/TiO₂는 발전소 기동 초기 및 저부하 운전에서 발생하는 NOx를 효과적으로 제거하지 못하며, 황과 수분에 의해 촉매 활성이 감소하게 된다. 따라서, 본 기고문에서는 NOx를 더욱 효과적으로 제거할 수 있는 촉매를 설계하기 위하여, 현재까지 연구된 바나디아 기반 촉매뿐만 아니라 다양한 금속 산화물 촉매, 제올라이트 촉매의 특징 및 촉매 활성 개선을 위한 연구를 소개하고자 한다.

당뇨병 환자의 치주건강 상태에 대한 임상적 연구

김현섭(Hyun Sub Kim),김병옥(Byung Ok Kim),한경윤(Kyung Yoon Han) 조선대학교 치의학연구원 1992 Oral Biology Research (Oral Biol Res) Vol.16 No.2

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계절별 기상조건에 따른 사고시나리오 모델링 발전방안

김현섭(Hyun-Sub Kim),전병한(Byeong-Han Jeon) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.10

본 연구에서는 여러 사업장에서 많이 사용되는 대표적 독성 물질인 염소를 누출 물질로 선정하여 화학사고 통계자료에 따라 사고 발생 빈도가 높은 여름철 기상조건을 인자로 한 대안의 시나리오와 기존의 시행방법인 연평균 기상조건을 인자로 한 대안의 시나리오 비교분석을 통해 개선방안을 제시하고자 하였다. 2014년 1월부터 2016년 12월까지 발생한 총 296건의 화학 사고를 분석한 결과 사계절 중 여름에 가장 많은 사고가 발생하는 것으로 조사되었으며 전체 사고 발생건수의 35.81%를 차지하였다. 실제 염소를 취급하는 사업장을 대상으로 위험성 평가 결과 2016년의 경우 연평균 기상조건하에서 산출된 영향범위는 발생원으로부터 반경 712.4 m, 영향범위 내 주민 수는 20,090 명이였으며, 여름철 평균 기상조건하에서 산출된 영향범위는 발생원으로부터 반경 796.2 m, 영향범위 내 주민 수는 27,143 명으로 나타났다. 이와 같은 결과는 특정 조건하에서 현 대안의 시나리오 상의 영향범위가 포괄할 수 없는 부분이 존재함을 의미한다. 따라서 화학 물질별 특성을 고려한 Case Risk Assessment가 이루어져야 한다는 위험성 평가 제도의 발전방향을 제시한다. In this study, we selected chlorine, a typical toxic material used in many workplaces, as the leakagematerial, and through the analysis of alternative scenarios based on the meteorological conditionsin the summer frequently encountered in accidents, we suggest ways to improve the (method of analysis/accident scenario modeling).The analysis of 296 chemical accidents from January 2014 to December 2016 found that the highest rate of occurrence was in summer, accounting for 35.81% of the total. According to the risk assessment, the influence range and number of inhabitants in the influence area were 712.4 m and 20,090 under the annual mean weather conditions and 796.2 m and 27,143 people underthe summer mean weather conditions, respectively. This result implies that, under certain conditions, the range of impacts in the current alternative scenario is incomplete. Therefore, risk assessment systemsneed to be improved in order to take into consideration the characteristics of each chemical substance.

로봇 협업 제어를 위한 역할 기반 XR 인터페이스

김현섭 ( Hyun-sub Kim ),유범재 ( Bum-jae You ),박정민 ( Jung-min Park ) 한국정보처리학회 2025 한국정보처리학회 학술대회논문집 Vol.32 No.1

특발성 치은섬유증식증에 대한 임상적 및 조직병리학적 연구

김현섭(Hyun Sub Kim),최영욱(Yeoung Wook Choi) 조선대학교 치의학연구원 1992 Oral Biology Research (Oral Biol Res) Vol.16 No.1

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고 영각의 델타익을 지나는 와유동에 관한 수치해석적 연구

김현섭(Hyun Sub Kim),김희동(Heuy Dong Kim),손명환(Myong Hwan Sohn) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5

This paper dispicts the vortex flow characteristics of a delta wing using the computation analysis. This<br/> study is focused on investigating and visualizing the effects of the angle of attack, free steam velocity, the<br/> development and interaction of vortices and the relationship between the suction pressure distribution and the<br/> vortex flow characteristics. Computations are applied to the three dimensional, compressible, Navier-Stokes<br/> Equations. For computations, the free stream velocity is changed between 20m/s and 60m/s and the angle of<br/> attack of the delta wing is changed between 16° and 24°. Computational results are compared with the<br/> previous experimental ones. It is found that the present CFD results predict the vortical flow characteristics of<br/> the delta wing well, and with an increase in the free stream velocity, the leading edge vortex moves outboard<br/> and its strength is increased.

해양 지구물리 탐사를 이용한 해저열수광상 부존지역 탐지 방법

김현섭 ( Hyun Sub Kim ),정미숙 ( Mee Sook Jung ),김창환 ( Chang Hwan Kim ),김종욱 ( Jong Uk Kim ),이경용 ( Kyeong Yong Lee ) 한국지구물리·물리탐사학회 2008 지구물리와 물리탐사 Vol.11 No.3

곡률 계산에 의한 해저면 지형요소 추출 기법 개발

김현섭 ( Hyun Sub Kim ),정미숙 ( Mee Sook Jung ),박정기 ( Cheong Kee Park ) 한국지구물리·물리탐사학회 2007 지구물리와 물리탐사 Vol.10 No.3

A seafloor curvature measurement method was developed to extract redundant topographic features from the multi-beam bathymetry data, and then applied to the data of abyssal plain area in the Pacific. Any seafloor might be modeled to a quadratic surface determined in a linear least squares sense, and its curvature could be derived from the eigen values related with quadratic model parameters. The curvature`s magnitude as well as polarity showed distinct relationship with geometric characteristics of the seafloor like as ridge and valley. From the investigation of curvature`s variation with the number of data in the quadratic surface, the optimal size of data aperture could be applied to real bathymetry data. The application to real data also required the determination of the accompanying threshold values to cope with corresponding topographic features. The calculation method of previous studies were reported to be sensitive to the background noise. The improved curvature measurement method, incorporating the sum of eigen values has reduced unwanted artifacts and enhanced ability to extract lineament features along strike direction. The result of application shows that the curvature measurement method is effective tool for the estimation of a possible mining area in the seamount free abyssal hill area.

해저면 영상 관찰을 통한 망간단괴 채광 장애지역 분포 특성 연구

김현섭 ( Hyun Sub Kim ),정미숙 ( Mee Sook Jung ),박정기 ( Cheong Kee Park ),고영탁 ( Young Tak Ko ) 한국지구물리·물리탐사학회 2007 지구물리와 물리탐사 Vol.10 No.3

It is well known that manganese nodules enriched with valuable metals are abundantly distributed in the abyssal plain area in the Clarion-Clipperton (C-C) fracture zone of the northeast Pacific. Previous studies using deep-sea camera (DSC) system reported different observations about the relation of seafloor topographic change and nodule abundance, and they were sometimes contradictory. Moreover, proper foundation on the estimation of DSC underwater position, was not introduced clearly. The variability of the mining condition of manganese nodule according to seafloor topography was examined in the Korea Deep Ocean Study (KODOS) area, located in the C-C zone. In this paper, it is suggested that the utilization of deep towing system such as DSC is very useful approach to whom are interested in analysing the distributional characteristics of manganese nodule filed and in selecting promising minable area. To this purpose, nodule abundance and detailed bathymetry were acquired using deep-sea camera system and multi-beam echo sounder, respectively on the seamount free abyssal hill area of southern part (132°10`W, 9°45`N) in KODOS regime. Some reasonable assumptions were introduced to enhance the accuracy of estimated DSC sampling position. The accuracy in the result of estimated underwater position was verified indirectly through the comparison of measured abundances on the crossing point of neighboring DSC tracks. From the recorded seafloor images, not only nodules and sediments but cracks and cliffs could be also found frequently. The positions of these probable unminable area were calculated by use of the recorded time being encountered with them from the seafloor images of DSC. The results suggest that the unminable areas are mostly distributed on the slope sides and hill tops, where nodule collector can not travel over.