시간지연을 갖는 네트워크 제어 시스템의 지능형 제어기 설계

배기선(Gi Sun Bae),주영훈(Young Hoon Joo) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.2

We consider the stabilization problem for a class of networked control systems with random delays in the discrete-time domain. The controller-to-actuator and sensor-to-controller time-delays are modeled as two Markov chains, and the resulting closed-loop systems are Markovian jump nonlinear systems with two modes. The T-S (Takagi-Sugeno) fuzzy model is employed to represent a nonlinear system with Markovian jump parameters. The aim is to design a fuzzy controller such that the closed-loop Markovian jump fuzzy system is stochastically stable. The necessary and sufficient conditions on the existence of stabilizing fuzzy controllers are established in terms of LMIs (Linear Matrix Inequalities). It is shown that fuzzy controller gains are mode-dependent. Finally, a simulation example is presented to illustrate the effectiveness of the proposed design method.

투명교정장치의 임상적 한계와 그 해결

배기선(Gi-Sun Bae) 대한치과의사협회 2016 대한치과의사협회지 Vol.54 No.7

A clear overlay appliance is a type of a removable appliance made from transparent thermoplastic plastic film that covers the entire dentition to move the teeth. It is one of the most favored orthodontic methods opted for by adult patients; this treatment is esthetic, does not cause discomfort and allows oral hygiene to be easily managed when compared to other conventional fixed treatment methods. However, the use of clear overlay appliances, such as invisalign or clear aligner, is associated with various clinical challenges. In particular, the appliances require longer treatment periods compared to fixed treatment, and due to the structural characteristics of the appliances, it is difficult to make proper posterior occlusion and certain type of tooth movement, including extrusion, rotation and tip. Thus, the clear overlay appliances are regarded as supplementary appliances by most orthodontists and have been used for simple orthodontic treatments, such as partial anterior alignments or orthodontic relapse cases. Owing to the remarkable advancement in the field of 3D digital technology over a period of 15 years, the accuracy and convenience of modern clear overlay appliances have continuously improved. Moreover, orthodontic outcomes have also been greatly improved by the introduction of new materials and successful application of various biomechanical methods from conventional orthodontic treatments in the design of clear overlay appliances. This study investigates the clinical limitations that should be considered during the application of clear overlay appliances and also examines the efforts and methods used to overcome these challenges.

시멘트 혼입 폴리머와 에폭시수지를 복합한 상하수 시설용 방수·방식공법 성능평가에 관한 연구

배기선(Bae, Gi Sun),장종호(Jang, Jong Ho),장성주(Jang, Sung Joo),오상근(Oh, Sang-Keun) 한국콘크리트학회 2004 한국콘크리트학회 학술대회 논문집 Vol.2004 No.5

점착 . 팽창성 유연형 방수시스템 기술의 도입

장혁수 ( Chang Huk-soo ),배기선 ( Bae Gi-sun ),오상근 ( Oh Sang Geun ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 논문집 Vol.3 No.2

균열거동 및 습윤환경 대응 누수보수기술

장혁수(Chang, Huk Soo),우영제(Woo, Young Je),배기선(Bae, Gi Sun),오상근(Oh Sang Geun) 한국콘크리트학회 2002 한국콘크리트학회 학술대회 논문집 Vol.2002 No.5

순환골재 치환율에 따른 콘크리트의 압축강도특성

이영오(Lee, Young-Oh),전에스더(Jeon, Esther),윤현도(Yun, Hyun Do),최기선(Choi, Ki Sun),배기선(Bae Gi Seon),김긍환(Kim, Keung Hwan) 한국콘크리트학회 2009 한국콘크리트학회 학술대회 논문집 Vol.2009 No.11

3차원 두부방사선규격사진의 정확성에 관한 연구

배기선,박수병,손우성 대한치과교정학회 1997 대한치과교정학회지 Vol.27 No.1

본 연구는 교정 임상에서 흔히 촬영되는 측모와 정모 두부방사선규격사진을 사용하여 3차원적인 두개안면 형태를 재현하였을 때 그 방법의 정확성을 고찰해 보고, 기존의 측모 두부방사선규격사진과 비교하여 어떠한 차이를 보이는지 알아보고자 하였다. 이를 위해 두개안면 골격모형의 3차원 두부방사선규격사진을 형성하고, 선 계측과 각도 계측을 시행하였다. 여기서 얻어진 계측치들을 실제 계측치 및 측모 두부방사선규격사진에서의 계측치와 비교하여 다음과 같은 결론을 얻었다. 1. 3차원 두부방사선규격사진의 선 계측 평균 오차는 0.94±0.62mm, 평균 확대율 100.31±0.91% 이었으며 실제 계측치와 차이를 보이지 않았다(α=0.1). 2. 측모 두부방사선규격사진은 선 계측에서 평균 오차 6.44±1.48mm, 평균 확대율 106.99±1.45%로서 하악체를 제외한 모든 선 계측에서 확대를 보였다(P<0.005). 3. 3차원 두부방사선규격사진에서의 각도 계측은 평균 오차 1.22±0.82°, 평균 확대율 105.72±12.07%로서 실제 계측치와 차이를 보이지 않았다.(α=0.1). 4. 측모 두부방사선규격사진은 평균 오차 1.70±0.94°, 평균 확대율 106.35±15.70%으로 실제 계측치와 차이를 보이지 않았다(α=0.1). Conventional cephalometrics have inherent errors because their evaluation is performed in two-dimension for three-dimensional object. To compensate these errors, three-dimensional cephalograms - derivation of three-dimensional data from conventional lateral and postero-anterior cephalograms - were developed. In this study, the accuracy and precision of three dimensional cephalograms were determined by means of 10 linear and 12 angular measurements on 36 acrylic skull models and by the comparison of conventional lateral cephalograms. The results were as follows : 1. Mean difference between three-dimensional cephalograms and actual models in linear measurements was 0.94±0.62mm and mean rate of magnification of three-dimensional cephalograms was 100.31±0.91%. There were no statistically significant differences between three-dimensional cephalograms and actual models in linear measurements(α=0.1). 2. Mean difference between conventional lateral cephalograms and actual models in linear measurements was 6.44±1.48mm and mean rate of magnification of lateral cephalograms was 106.99±1.45%. There were statistically significant differences between lateral cephalograms and actual models in linear measurements(P<0.005). 3. Mean difference between three-dimensional cephalograms and actual models in angular measurements was 1.22±0.82° and mean rate of magnification of three-dimensional cephalograms was 105.71±12.07%. There were no statistically significant differences between three-dimensional cephalograms and actual models in angular measurements(α=0.1). 4. Mean difference between conventional lateral cephalograms and actual models in angular measurements was 1.70±0.94° and mean rate of magnification of lateral cephalograms was 106.35±15.70%. There were no statistically significant differences between lateral cephalograms and actual models in angular measurements(α=0.1). There were similarity between three-dimensional and lateral cephalograms in angular measurements.

설측 교정치료를 위한 셋업 모형 제작의 정밀도

배기선,손우성 대한치과교정학회 발행 2005 대한치과교정학회지 Vol.35 No.6

치아 모형 및 셋업 모형에서의 정확한 순설측 및 근원심 경사의 측정을 위해 개발된 셋업 모형 측정기로 4개의 제1소구치 발거 후 설측 교정치료를 시행 받은 22명의 성인 환자들의 치료 전후의 진단 모형 및 셋업 모형을 계측하여 설측 교정치료에서 간접 접착술식을 위해 사용되는 셋업 모형의 형태가 치료 결과에 미치는 영향을 알아보고자 하였다. 연구 결과 치료 전 진단 모형과 셋업 모형간의 상하악 6전치의 순설측 근원심 경사 차이는 각각 -3.93 ± 6.98°, 1.87 ± 5.79° 였으며 셋업 모형과 치료 후 치아 모형간의 차이는 -4.31 ± 5.91°, -2.16 ± 3.27°였다. 치료 후 치아 모형에서는 치료 전에 비해 상하악 전치부의 순설측 경사가 -8.24 ± 5.39°만큼 유의성 있게 변화되었다. 또한 facebow transfer 등을 통해 교합기에 치아 모형을 거상하지 않고도 셋업 모형 측정기만으로 치아 모형과 측모 두부방사선규격사진을 서로 연계하여 분석하는 방법을 고안하여 그 임상적용 가능성을 알아보고자 하였다. 이를 위하여 셋업 모형 측정기를 사용하여 진단용 모형으로부터 측정한 계측 게이지 각과 측모 두부방사선규격사진상에 동일한 계측점과 선분들을 작도하여 측정한 산술 게이지 각을 비교하였으며 그 결과 상하악 모두에서 유의성 있는 차이가 나타나지 않았다. 따라서 셋업 모형 측정기를 사용하여 측모 두부방사선사진에서의 계측치들을 진단용 모형에서의 계측치와 서로 연계시켜 분석하고 이를 셋업 모형 제작 시 반영하는 방법이 임상적으로 사용 가능함을 알 수 있었다. Making a precise and ideal set-up model is an essential part in the indirect bonding procedure for lingual orthodontic treatment. To evaluate the accuracy of the making a set-up model, 22 adult patients who received lingual orthodontic treatment with 4 bicuspid extractions were selected, and 3 sets of dental models (before, set-up, and after treatment) were measured using the set-up model gauge, an instrument for measuring the incllnation and acgulation of the clinical crowns on the dental model. Two sets of lateral cephalograms (before and after) from each patient were also evaluated. The mean difference between the before treatment model and the set-up model was -3.93 ± 6.98° for the inclination and 1.87 ± 5.79° for the angulation. And the mean difference between the set-up model and the after treatment model was -4.31 ± 5.91° labiolingually and -2.16 ± 3.27° mesiodistally. The after treatment model differed from the before treatment model about -8.24 ± 5.39° in inclination. There were no significant difference between the measured gauge that measured from the dental model using the set-up model gauge and the calculated gauge angle measured from the lateral cephalogram using constructed points and lines. Using the set-up model gauge, it is possible to evaluate the study model 3-dimensionally in relation with the patient's lateral cephalogram and establish whether the doctor's prescription or overcorrection is built in the set-up model precisely.