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.

수학적 표현의 교수학적 의의

김영국 ( Young Kuk Kim ) 한국수학교육학회 2008 수학교육 Vol.47 No.2

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.

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

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

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.

學校數學의 각 領域에 대한 選好度 硏究

김영국(Kim, Young Kuk),박기양(Park, Ki Yang),박규홍(Park, Kyoo Hong),박혜숙(Park, Hye Sook),박윤범(Park, Yunbeom),임재훈(Yim, Jae-hoon) 서원대학교 미래창조연구원 2001 基礎科學硏究論叢 Vol.15 No.-

가스 열병합발전 최적 시뮬레이션 분석을 통한 집단에너지 사업자에 미치는 8차 전력 수급계획의 영향 분석

김영국 ( Young Kuk Kim ),오광민 ( Kwang Min Oh ),김래현 ( Lae Hyun Kim ) 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.5

신 기후체제 출범에 따른 기후변화의 효율적 대응을 위해 정부는 분산형 전원의 확대를 모색하고 있다. 이 중 가스열병합발전(CHP)을 중심으로 하는 집단에너지 시스템이 가장 현실적인 대안으로써 받아들여지고 있다. 한편 최근 발표된 8차 전력수급 기본계획을 통해 정부는 기저 발전 중심에서 친환경 발전 위주로 에너지 패러다임의 변화를 공표하였다. 본 연구에서는 이러한 에너지 패러다임의 변화가 CHP의 열 생산 패턴을 변화시켜 집단에너지 공헌이익에 미칠 수 있는 정량적인 손익 효과를 분석하는 연구를 수행하였다. 이를 위해 먼저 상용화된 전력시장 종합분석 프로그램을 활용하여 7,8차 수급계획별 전력시장 장기 시뮬레이션을 수행하였다. 또한 현재 수도권에서 830 MW급 CHP를 운영중인 사업자의 실적을 활용하여 CHP 운전 Mode별로 전력생산량과 열 생산량을 산정할 수 있는 CHP 운영모델을 구성하였다. 이를 바탕으로 상용화된 집단에너지 최적운영 프로그램을 통해 CHP의 Life-Cycle 동안의 최대의 운영수익을 실현할 수 있는 운전 최적화를 수행하였다. 그 결과 정부의 에너지 패러다임의 변화는 CHP의 급전지시량을 증가시키고 이로 인해 열 생산원가가 하락하여 사업자의 공헌이익이 30년 동안 909억 증가함을 확인할 수 있었다. To respond effectively to climate change following the launch of the new climate system, the government is seeking to expand the use of distributed power resources. Among them, the district heating system centered on Combined Heat and Power (CHP) is accepted as the most realistic alternative. On the other hand, the government recently announced the change of energy paradigm focusing on eco-friendly power generation from the base power generation through 8^th Basic Plan for Long-term Electricity Supply and Demand(BPE). In this study, we analyzed the quantitative effects of profit and loss on the CHP operating business by changing patterns of the heat production, caused by the change of energy paradigm. To do this, the power market long-term simulation was carried out according to the 7^th and 8^th BPE respectively, using the commercialized power market integrated analysis program. In addition, the CHP operating model is organized to calculate the power and heat production level for each CHP operation mode by utilizing the operating performance of 830MW class CHP in Seoul metropolitan area. Based on this, the operation optimization is performed for realizing the maximum operating profit and loss during the life-cycle of CHP through the commercialized integrated energy optimization program. As a result, it can be seen that the change of the energy paradigm of the government increased the level of the ordered power supply by Korean Power Exchange(KPX), decreased the cost of the heat production, and increased the operating contribution margin by 90.9 billion won for the 30 years.

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.