켑스트럼 기반의 후두암 감별을 위한 채널보상

김영국,김수미,김형순,왕수건,조철우,양병곤,Kim Young Kuk,Kim Su Mi,Kim Hyung Soon,Wang Soo-Geun,Jo Cheol-Woo,Yang Byung-Gon 대한음성학회 2004 말소리 Vol.50 No.-

Automatic detection of laryngeal diseases by voice is attractive because of its non-intrusive nature. Cepstrum based approach to detect laryngeal cancer shows reliable performance even when the periodicity of voice signals is severely lost, but it has a drawback that it is not robust to channel mismatch due to different microphone characteristics. In this paper, to deal with mismatched training and test microphone conditions, we investigate channel compensation techniques such as Cepstral Mean Subtraction (CMS) and Pole Filtered CMS (PFCMS). According to our experiments, PFCMS yields better performance than CMS. By using PFCMS, we obtained 12% and 40% error reduction over baseline and CMS, respectively.

다양한 잡음 환경하에서 환경 군집화를 통한 화자 및 환경 동시 적응

김영국,송화전,김형순,Kim, Young-Kuk,Song, Hwa-Jeon,Kim, Hyung-Soon 한국음향학회 2009 韓國音響學會誌 Vol.28 No.6

This paper proposes noise-robust fast speaker adaptation method based on the eigenvoice framework in various noisy environments. The proposed method is focused on de-noising and environment clustering. Since the de-noised adaptation DB still has residual noise in itself, environment clustering divides the noisy adaptation data into similar environments by a clustering method using the cepstral mean of non-speech segments as a feature vector. Then each adaptation data in the same cluster is used to build an environment-clustered speaker adapted (SA) model. After selecting multiple environmentally clustered SA models which are similar to test environment, the speaker adaptation based on an appropriate linear combination of clustered SA models is conducted. According to our experiments, we observe that the proposed method provides error rate reduction of $40{\sim}59%$ over baseline with speaker independent model. 본 논문에서는 eigenvoice 방식에 기반하여 다양한 잡음 환경에 강인한 고속 화자 적응 방법을 제안하였다. 제안된 방법은 잡음 제거 기술과 환경 군집화 방법을 기반으로 한다. 그러나, 잡음 제거 기술을 통해 잡음을 제거한 후에도 여전히 잔여 잡음이 존재하므로 비음성 구간의 켑스트럼 평균을 사용하여 잡음 환경별로 화자 적응 데이터를 분류한 후 각각의 환경별로 환경 모델을 구성한다. 이러한 환경 군집화를 적응데이터에 대해 구성한 후 테스트 음성이 입력되면 군집화된 모델 중에서 인식 데이터와 가장 유사한 복수의 환경별 군집화된 화자 적응 모델을 구한 후 이들의 가중함을 통해 화자 적응을 수행하는 방법이다. 제안된 방법은 적응 및 평가를 통해 화자 독립 모델을 사용한 경우에 비해 $40{\sim}59%$ 인식 오류 감소율을 얻었다.

다가구 매입임대주택 시설관리 개선방안 연구

김영국(Kim, Young-kuk),정재원(Jeong, Jae-won),하미경(Ha, Mi-kyoung) 대한건축학회 2016 대한건축학회 학술발표대회 논문집 Vol.36 No.2

This study aims to set up Facility Management System of Purchased Rental Multi-Family-Housing. The characteristics of multi-family-housing are that accommodate around 10 households, spread over a wide area and the households are the people needs to be protected by a welfare program. This is why too difficult to manage the multi-family-housing for administrator, and there are several obstacles to set up long-term strategy that housing management code limited to only apartment building. According to a result of analysis of repair rate data and site survey, management criteria for multi-family-housing tends to focus on interior finishing elements, for example, wall-covering, flooring, sanitary ware, lighting, etc. And there are latent risks in common space of deteriorated housing because inspection and maintenance is mainly initiated based on interior space of each household. The main problem is there is no facility management guidelines that make sure work scope and criteria considering the characteristics of multi-family-housing. In order to improve the management system of the Multi-Family-Housing, first, it is required to develop facility inspection manual and check-list Secondly, it is more important to established Housing management System, house life cycle and living environment for residence. Lastly, information management system is demanded for instance repair rate of housing considering life-cycle of the housing

전기화학적 금속 3D 프린터의 적층 조건 연구를 통한 마이크로 코일 제작

김영국(Young-Kuk Kim),강동화(Donghwa Kang),김성빈(Sung-Bin Kim),유봉영(Bongyoung Yoo) 한국표면공학회 2020 한국표면공학회지 Vol.53 No.4

In this study, we produced a coil of micro-pattern that can be used for electromagnetic wave absorber, heating material, wireless charging, sensor, antenna, etc. by using electrochemical additive manufacturing method. Currently, it contains research contents for manufacturing a micro pattern coil having practicality through control of process control variables such as applied voltage, distance between electrode, and nozzle injection. Circulation of the electrolyte through the nozzle injection control can significantly contribute to improving the surface characteristics of the coil because of minimizing voltage fluctuations that may occur during the additive manufacturing process. In addition, by applying the pulse method in the application of voltage, the lamination characteristics of the plated body were improved, which showed that the formation of a fine line width plays an important role in the production of a micro pattern coil. By applying the pulse signal to the voltage application, the additive manufacturing characteristics of the produced product were improved, and it was shown that the formation of a fine line width plays an important role in the production of a micro pattern coil.

소수력 발전소에 적용하는 유도발전기의 동작 특성

김영국(Young-Kuk-Kim),김종겸(Jong-Gyeum Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.5

In this study, we described voltage fluctuation characteristics of distribution line during starting and normal operation condition of the small hydro generators. Based on these theories, we scrutinized the starting and operating characteristics of induction generators installed in two small hydro power plants that is connected to the distribution line and researched necessary factors when selecting the generator type. The type of turbines and capacity of generators are different. One is below 1,000㎾ and the other is above 1,000㎾. Two generators are tested during starting, and it acts as motor not generator at the instant that the machine is connected to the grid. After connecting to the grid, the machine rotates above synchronous speed before converting to the generator mode. Therefore the characteristic of the generator during starting is same as it of motor.

독립된 고압성 하부식도괄약근의 임상 및 식도내압 검사소견

김영국(Young Kuk Kim),강영우(Young Woo Kang) 대한내과학회 1995 대한내과학회지 Vol.48 No.2

N/A Objectives: Hypertensive lower esophageal sphincter, an uncommon esophageal motility disorder, was frequently associated with the nutcracker esophagus so that it was difficult to know which motility disorder was the cause of the symptom. The present study was performed to evaluate the clinical and manometric findings of isolated hypertensive lower esophageal sphincter. Method: The clinical findings of 14 patients with isolated hypertensive lower esophageal sphincter were studied and manometric findings were compared between 14 patients and 15 normal subjects. Result: 14 cases among 456 cases who undertaken esophageal manometry from August, 1988 to December, 1993 were diagnosed as isolated hypertensive lower esophageal sphincter (3.1%). The average age was 44 years old, ranging from 12 to 66. Male to female ratio was 1:6. Chief complaints of the patients were dysphagia (6 cases), globus sense (3 cases), chest pain (3 cases), and epigastric pain (2 cases). The LES pressure was significantly higher in patients with isolated hypertensive lower esophageal sphincter compared to normal control subjects (49.2±3.0mmHg vs 24.3±7.0mmHg, p<0.001). But there were no significant differences in the nadir pressure (2.4±2.0mmHg vs 1.8±1.5mmHg) and the amplitude of contractions at 3㎝ above LES (110.3±30.5mmHg vs 98.7±35.4mmHg). Conclusion: Esophageal manometric evaluation is necessary considering variable clinical manifestation of the isolated hypertensive lower esophageal sphincter. Long-term follow up studies should be taken to evaluate pathophysiologic mechanism and theraputic effect in large numbers of patients with isolated hypertensive esophageal sphincter.

ResNet 을 이용한 손그림기반 캐릭터 검색 웹서비스

김영국(Young-Kuk Kim),박찬영(Chan-Young Park),백승원(Seung-Won Paik),손경아(Kyung-Ah Shon) 한국정보과학회 2018 한국정보과학회 학술발표논문집 Vol.2018 No.6

공동주택 주동 내 공용공간 환경디자인에 관한 연구

김영국(Kim, Young-Kuk),하미경(Ha, Mi-Kyoung) 한국실내디자인학회 2011 한국실내디자인학회 학술대회논문집 Vol.13 No.1

Apartment housing developed focus on distributing the number of the housing unit rather than the quality of living. Critical opinions on the deterioration in sense of community, standardized housing typology and deficient open space resulted by those trend have been raised, and consequently there is increasing public interest in the ‘Communal Space’ as a alternative space for resolving those problems mentioned above. The communal space of dwelling unit in Apartment not only have a significant role in intermediating to connect between units, but also intent planning implication as a public open space. Therefore, it can not ignore the importance of communal space design considering the impact on residents’ satisfaction and sustainable community development. Despite the importance of the space, however, it has been disregarded in design processing procedure so that this space has been regarded as an unsafe space within apartment housing which produce unsuitable illuminance and unsafe environment resulting the residents’ unsatisfaction. Thus, this paper will suggest guideline for communal space design through analysis on existing conditions of public housing and residents’ needs which provides ‘inclusive environment design’, ‘safe and pleasant living environment’ and ‘vitalizations of samll group community’.

고장력 체인클램프를 활용한 관형지지물 추락 및 낙하물 방호장치 개발·적용

김영국(Young-Kuk Kim),박형렬(Hyung-Ryul Park),박재형(Jae-Hyeong Park),최병만(Byoung-Man Choi),이승훈(Seung-Hun Lee),이혜민(Hye-Min Lee) 대한전기학회 2022 대한전기학회 학술대회 논문집 Vol.2022 No.7

Banach공간에 함수값을 갖는 함수에 대한 MH -Stieltjes 적분

김영국 ( Young Kuk Kim ),윤주한 ( Ju Han Yoon ) 충북대학교 과학교육연구소 2014 과학교육연구논총 Vol.29 No.2

L.Garces, P.Y.Lee 그리고 D.Zhao([1])는 1999년에 H-적분을 정의하고, 이 적분과 Henstock 적분과의 관계를 연구하였다. 본 논문에서는 Banach 공간의 값을 갖는 MH-Stieltjes 적분을 정의하고, 이 적분의 기본적인 성질을 연구하였다.