치은연하 치석의 침착양상에 관한 연구

강인구,김병옥,한경윤,Kang, In-Ku,Kim, Byung-Ok,Han, Kyung-Yoon 대한치주과학회 1994 Journal of Periodontal & Implant Science Vol.24 No.1

Dental calculus which is calcifing and/or calcified dental plaque is divided into supragingival calculus and subgingival calculus according to the position of deposit to gingival margin. Subgingival calculus has more important clinical significance in diagnosis and treatment of periodontal disease than supragingival calculus. In order to investigate the deposition pattern of subgingival calculus on each root surface of different tooth type, extracted 192 teeth due to excessive destruction of periodontal tissue were divided according to tooth type and the deposition pattern of subgingival calculus was classified into linear type, veneer type, scattered type, and aggregated type according to the configuration and the extent of deposit. The difference of percentage between each deposition pattern was statistically analyzed by Chi-Square test. Following results were obtained : l. In maxillary incisors, linear type and aggregated type were predominant deposition pattern of subgingival calculus on labial(45.5%, 36.4%) and palatal(36.4%, 36.4%) root surface, aggreated type(72.7%) was on mesial surface, and aggregated type(54.5%) and scattered type(36.4%) was on distal suface. 2. In mandibular incisors, scattered type, linear type and aggregated type were predominant deposition pattern of subgingival calculus on labial(33.3%, 30.6%, 27.8%) and lingual(36.1%, 30.6%, 25.0%) root surface, aggregated type(33.3%), scattered type(27.8% ), and veneer type(27.8%) were on mesial surface, and aggregated type(38.9%) and scattered type(33.3%) on distal surface. 3. In maxillary peremolars, the predominant deposition patterns of subgingival calculus were linear type(28.6%) on buccal root suface, scattered type(35.7%) and linear type(28.6%) on palatal surface, scattered type(39.3%) on mesial surface, aggregated type(46.4%) on distal surface, and aggregated type(53.6%) on furcation area. 4. In mandibular premolars, scattered type was predominant deposition pattern of subgingival calculus on buccal(39.3%) and lingual(50.0%) root surface, scattered type(32.1%) and aggregated type(32.1% ) were on mesial surface, and aggregated type(42.9%) was on distal surface. 5. In maxillary molars, aggregated type(40.0%) and scattered type(32.5%) were predominat deposition pattern of subgingival calculus on buccal root surface, aggregated type was on distal(40.0%) and furcation area(50.0%), but there was no predominat pattern on palatal and mesial root surfaces. 6. In mandibular molars, aggregated type(39.5%) and scattered type(28.9%) were predominant deposition patterns of subgingival calculus on buccal root surface, aggregated type(36.8%) was on lingual surface, linear type(39.5%) and aggregated type(34.2%) were on furcation area, but there was no predominant pattern on mesial and distal root surfaces.

치은연하 치석의 침착양상에 관한 연구

강인구(In Ku Kang),김병옥(Byung Ok Kim),한경윤(Kyung Yoon Han) 조선대학교 구강생물학연구소 1994 Oral Biology Research (Oral Biol Res) Vol.18 No.1

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극놀이 영역의 환경구성 및 교사의 역할이 유아의 문해행동에 미치는 효과

강인구(In Ku Kang),현은자(Eun Ja Hyun) 한국아동학회 1995 아동학회지 Vol.16 No.1

The purpose of this study was to examine how the intervention of a literacy environment influences young children`s literacy behavior in dramatic play. Four classrooms at S kindergarten and Y kindergarten in Seoul were randomly selected for this study. Each of the classrooms was designated as an experimental group: that is, experimental group A (38 children), experimental group B (34 children), experimental group C (35 children) and a Control group (40 children), respectively. Group C was provided with literacy materials, theme of dramatic play and teacher`s intervention. Group B was provided with literacy materials and theme of dramatic play. Group A was provided with only literacy materials. It was found that the intervention of the literacy environment in dramatic play brought about an increase in children`s total literacy behavior, increase in the frequency of children`s reading behavior, and increase in the frequency and function of children`s writing.

이항교습과정의 수험에 대해서

강인구(In Ku Kang) 대한전기학회 1968 전기의 세계 Vol.17 No.1

The convergence rate of Bayes' learning process is investigated for a binomial random variable. A measure of the rate of convergence is proposed and it is found that such a measure can be approximated by an exponential function of the number of observations.

비궤양성 소화불량증 환자의 아형분포에 대한 연구

성인경(In Kyung Sung),강인구(In Ku Kang),심승철(Seung Chul Shim),김종필(Jong Pil Kim),이기창(Kee Chang Lee),손정일(Chong Il Sohn),정철헌(Chul Hun Jung),박동일(Dong Il Park),이종철(Jong Chul Rhee) 대한내과학회 1994 대한내과학회지 Vol.46 No.3

N/A Objectives: It has been proposed that patients with non-ulcer dyspepsia can be classified into symptom subgroups. Subgroups were as follows; those with symptoms suggestive of peptic ulceration (ulcerlike dyspepsia), those with gastric stasis (dysmotilitylike dyspepsia), those with gastroesophageal reflux (refluxlike dyspepsia), and the remainder (unspecified dyspepsia). Methods: The study population consisted of 306 patients with non-ulcer dyspepsia admitted to or attending to Hanyang University Hospital from the beginning of Feb. 1990 to the end of August 1992. We evaluated the gastrointestinal symptoms and measured gastric emptying time for 150min using radionuclide scintiscan of an 99mTc-labeled chicken liver. Results: 1) A total of 306 patients with diagnosed to non-ulcer dyspepsia, 54% had dysmotilitylike dyspepsia, 16% had ulcerlike dyspepsia, 2% had refluxlike dyspepsia and 10% had unspecified dyspepsia. 2) A total of 148 non-ulcer dyspepsia patients with normal gastric emptying time, 48% had dysmotilitylike dyspepsia, 19% had ulcerlike dyspepsia, 2% had refluxlike dyspepsia and 10% had unspecified dyspepsia. 3) A total of 158 non-ulcer dyspepsia patients with delayed gastric emptying time, 61% had dysmotilitylike dyspepsia, 14% had ulcerlike dyspepsia, 2% had refluxlike dyspepsia and 9% had unspecified dyspepsia. 4) Dysmotilitylike dyspepia was more commonly present in patients with delayed gastric emptying time than in patients with normal gastric emptying time(p<0.05) 5) There was a slight female predominance (1:1.3 male-female ratio) in non-ulcer dyspepsia patients with normal gastric emptying and peak incidence was 40 to 49 years of age (40%). 6) There was a female predominance (1:1.9 male-female ratio) in non-ulcer dyspepsia patients with delayed gastric emptying and peak incidence was 40 to 49 years of age(42%). 7) A total of non-ulcer dyspepsia patients, 35% had irritable bowel symptoms and the frequency of accompanied irritable bowel symptoms was statistically significant difference between the patients with normal gastric emptying time (46%) and the patients with delayed gastric emptying time (26%)(p<0.01). Conclusion: Among the non-ulcer dyspepsia patients in Korean, dysmotilitylike dyspepsia was most common subgroup and the refluxlike dyspepsia was very rare and 35% had irritable bowel syptoms.

화학공정의 HAZOP 분석을 위한 전문가 시스템 개발

김구회(Ku Hwoi Kim),강인구(In Koo Kang),이병우(Byung Woo Lee),이종민(Jong Min Lee),윤인섭(En Sup Yoon) 한국가스학회 1999 한국가스학회지 Vol.3 No.1

다양한 객체 추적 알고리즘의 비교 시스템 구현

장일식(Il Sik Chang),강인구(In-Ku Kang),박구만(Goo-Man Park) 한국통신학회 2012 한국통신학회 학술대회논문집 Vol.2012 No.2

하이브리드 알고리즘을 이용한 신경망의 학습성능 개선

김원욱,조용현,김영일,강인구,Kim, Weon-Ook,Cho, Yong-Hyun,Kim, Young-Il,Kang, In-Ku 한국정보처리학회 1997 정보처리논문지 Vol.4 No.11

본 논문에서는 공액기울기법과 터널링 시스템을 조합사용하여 신경망의 학습성능을 향상시킬 수 있는 효율적인 방법을 제안하였다. 빠른 수렴속도의 학습을 위하여 공액 기울기법에 기초한 후향전파 알고리즘을 사용하였고, 국소최적해를 만났을 때 이를 벗어난 다른 연결가중치의 설정을 위해 동적터널링 시스템에 기초한 후향전파 알고리즘을 조합한 학습 알고리즘을 적용하였다. 제안된 방법을 패리티 검사 및 패턴분류 문제에 각각 적용하여 기존의 기울기 하강법에 기초한 후향전파 알고리즘 및 기울기 하강법과 동적터널링 시스템을 조합한 후향전파 알고리즘방법의 결과와 비교 고찰하여 제안된 방법이 다른 방법들 보다 학습성능에서 우수함을 나타내었다. This Paper Proposes an efficient method for improving the training performance of the neural networks using a hybrid of conjugate gradient backpropagation algorithm and dynamic tunneling backpropagation algorithm The conjugate gradient backpropagation algorithm, which is the fast gradient algorithm, is applied for high speed optimization. The dynamic tunneling backpropagation algorithm, which is the deterministic method with tunneling phenomenon, is applied for global optimization. Conversing to the local minima by using the conjugate gradient backpropagation algorithm, the new initial point for escaping the local minima is estimated by dynamic tunneling backpropagation algorithm. The proposed method has been applied to the parity check and the pattern classification. The simulation results show that the performance of proposed method is superior to those of gradient descent backpropagtion algorithm and a hybrid of gradient descent and dynamic tunneling backpropagation algorithm, and the new algorithm converges more often to the global minima than gradient descent backpropagation algorithm.

항공 LiDAR 시스템 검정 및 정확도 평가 연구

최윤수(Choi, Yun Soo),강인구(Kang, In Ku),이강원(Lee, Kang Won) 한국측량학회 2005 한국측량학회지 Vol.23 No.4

MEMS 기술을 이용하여 제작한 적외선 영상 투사용 에미터 단위 소자의 특성 분석

박기원(Ki Won Park),신영봉(Young Bong Shin),강인구(In-Ku Kang),이희철(Hee Chul Lee) 대한전자공학회 2017 전자공학회논문지 Vol.54 No.3

본 논문에서는 가상의 적외선 영상을 투사하여 적외선 검출기의 성능 평가를 위한 목적으로 사용되는 적외선 영상 투사장치 (Infrared scene projector, IRSP)의 내부에서 적외선을 방사하는 역할을 하는 적외선 에미터 소자에 대한 연구가 수행되었다. 적외선 에미터 소자의 구조를 설계한 후 설계된 소자의 특성 파라미터들을 추출하였으며 각 특성 파라미터에 근거한 소자의 성능을 유한 요소법을 통해 예측하였다. 또한 소자를 구성하는 각 부분의 특성에 따른 물질 선정 후 MEMS 기반 반도체공정기술을 적용하여 에미터 단위소자를 제작하였고 중적외선 대역(3∼5μm)의 적외선을 관찰할 수 있는 적외선 영상 현미경을 사용하여 진공 환경을 갖춘 챔버 내부에서 소자의 성능을 측정한 결과 최대 423K의 유효온도 및 22msec의 응답 시간을 나타내는 것을 확인하였다. In this paper, designed infrared (IR) emitter device for infrared scene projector (IRSP) which is used for evaluating the performance of IR sensor systems was simulated by using finite element analysis (FEA) tool and fabricated by using MEMS (Micro Electro-Mechanical System) technology. The performance of the fabricated IR emitter unit device was characterized in the vacuum chamber by using IR image microscope for MWIR(3∼5μm), which showed 423K apparent temperature (Tapp) and 22msec time constant (τ).