Pseudo-Cepstral Representation of Speech Signal and Its Application to Speech Recognition

김홍국,이황수,Kim, Hong-Kook,Lee, Hwang-Soo The Acoustical Society of Korea 1994 韓國音響學會誌 Vol.13 No.e1

In this paper, we propose a pseudo-cepstral representation of line spectrum pair(LSP) frequencies and evaluate speech recognition performance with cepstral lift using the pseudo-cepstrum. The pseudo-cepstrum corresponding to LSP frequencies is derived by approxmating the relationship between LPC-cepstrum and LSP frequencies. Three cepstral liftering procedures are applied to the pseudo-cepstrum to improve the performance of speech recognition. They are the root-power-sums ligter, the general exponential lifter, and the bandpass lifter. Then, the liftered psedudo-cepstra are warped into a mel-frequency scale to obtain feature vectors for speech recognition. Among the three lifters, the general exponential lifter results in the best performance on speech recognition. When we use the proposed pseudo-cepstra feature vectors for recognizing noisy speech, the signal-to-noise ratio (SNR) improvement of about 5~10dB LSP is obtained.

Feature Map을 이용한 한국어 음소 분류

김홍국(Hong Kook Kim),이황수(Hwang Soo Lee) 한국통신학회 1990 한국통신학회 학술대회논문집 Vol.1990 No.8

Oxidation of Hydrogen sulfide, Ammonia nitrogen and Nitrite nitrogen by Bacillus sp. Isolated from West Coast of Korea

Hong-Kook KIM(김홍국),Geun-Seop KIM(김근섭),Chae-Rin PARK(박채린),Byeong-Soo KIM(김병수) 한국수산해양교육학회 2020 수산해양교육연구 Vol.32 No.4

In the aquaculture industry, the biological treatment using probiotics for eliminating hydrogen sulfide, ammonia nitrogen and nitrite nitrogen is receiving attention. In this study, Bacillus sp. TO-3, Bacillus sp. TO-10 and Bacillus sp. TO-12 were isolated from the west coast of Korea and oxidation ability of hydrogen sulfide, ammonia nitrogen and nitrite nitrogen were analyzed. Bacillus sp. TO-10 had high oxidation toward hydrogen sulfide by oxidizing 100% and Bacillus sp. TO-3 and TO-12 each had hydrogen sulfide oxidation of 49.53% and 69.03%. Bacillus sp. TO-10 and Bacillus sp. TO-12 had ammonia nitrogen oxidation approximately of 32.7 mg/L, while Bacillus sp. TO-3 had 11.4 mg/L of ammonia nitrogen oxidation. Bacillus sp. TO-3, Bacillus sp. TO-10 and Bacillus sp. TO-12 all had high oxidation toward nitrite nitrogen by oxidizing 100% of 137.46 mg/L nitrite nitrogen. Therefore, Bacillus sp. TO-3, Bacillus sp. TO-10 and Bacillus sp. TO-12 are possible probiotics used as water quality improvement of eliminating hydrogen sulfide, ammonia nitrogen and nitrite nitrogen.

제2경인고속도로(안양~성남 간) 갈등해결사례 분석: 협상학적 관점

김홍국 ( Kim Hong-kook ) 한국협상학회 2016 협상연구 Vol.19 No.2

This study pursued various objective and rational method to solve by Internal Negotiation through providing mutual interest distribution without an extreme confrontation or conflict. It focused on the issues and the negotiation strategy of the key negotiators side (The Ministry of Land, Infrastructure and Transport, West Pangyo & Geumto-Dong residents) in the perspective of negotiation study. The negotiation agenda included topics such as issue, interest, BATNA, etc. In this study, overall negotiation process is divided three major phases (Initiation, Problem solving, Resolution) from 2009 through 2014, and derived the implications for each side`s negotiation strategy in each phase. To seek the meaning of this negotiation case, this study derived 4 implications, such as getting out of the hardliner`s confrontation attitude. and making the room of win-win strategy to enhance the mutual interests and understanding with the collaborative behavior, and the important role of the government, a mediator.

대통령의 국정어젠다와 대(對) 국회 협상에 관한 연구

김홍국 ( Hong Kook Kim ) 한국협상학회 2009 협상연구 Vol.13 No.1

The purpose of this paper is to search for the desirable president`s negotiation style and method with the congress. In Korea, the political negotiations between the president and the congress were full of conflict and confrontation. After the 1987 democratic movement, the imperial president has been used the enormously powerful rule in the political arena in spite of the democratization over the length of the whole fields all over the country. In the unified government as well as the divided government, the president has the almighty power, so the dialogues between the president and the congress have been almost vanished in these days. The presidential agenda will get the driving force only after going through the reflection of the public opinion and the negotiation with the congress. The fundamental objective of the presidential agenda methodology is the implementation of the president`s main policy achievement based on the support of the congress and the public opinion. Therefore, the president and the adminstration need to prepare to negotiate with the congress with radically changing their attitude to the congress, and to establish the institutional arrangement for the political reform at the same time. Even though this approach does not provide a direct way of solving the conflict and confrontation between the president and the congress, it would be very meaningful when we consider the importance of the presidential agenda and the negotiation process and to pursue the reform of the stagnated political culture and the general practice.

음성신호에 대한 WSOLA 알고리즘 기반 시간축변환의 계산량 감축

김덕수(Duk Su Kim),이영한(Young Han Lee),김홍국(Hong Kook Kim),김명보(Myeongbo Kim),김상룡(Sang Ryong Kim) 한국HCI학회 2010 한국HCI학회 학술대회 Vol.2010 No.1

유산균 발효 보리새싹 열수추출물의 항산화 및 면역 활성 효과

김근섭(Geun-Seop Kim),양기현(Kee Heun Yang),김홍국(Hong-Kook Kim),김지은(Ji-Eun Kim),윤하늘(Ha-Neul Yun),유지웅(Ji-Woong Yu),김병수(Byeong-Soo Kim) 한국식품영양과학회 2022 한국식품영양과학회지 Vol.51 No.10

공공데이터를 활용한 선박 통행량 및 해양기상정보의 수중 주변소음에 대한 영향성 분석

김용국,국영민,김동관,김규철,윤상기,최창호,김홍국,Kim, Yong Guk,Kook, Young Min,Kim, Dong Gwan,Kim, Kyucheol,Youn, Sang Ki,Choi, Chang-Ho,Kim, Hong Kook 한국음향학회 2020 한국음향학회지 Vol.39 No.6

In this paper, we analyze the influences of ship traffic and marine weather information on underwater ambient noise. Ambient noise is an important environmental factor that greatly affects the detection performance of underwater sonar systems. In order to implement an automated system such as prediction of detection performance using artificial intelligence technology, which has been recently studied, it is necessary to obtain and analyze major data related to these. The main sources of ambient noise have various causes. In the case of sonar systems operating in offshore seas, the detection performance is greatly affected by the noise caused by ship traffic and marine weather. Therefore, in this paper, the impact of each data was analyzed using the measurement results of ambient noise obtained in coastal area of the East Sea of Korea, and public data of nearby ship traffic and ocean weather information. As a result, it was observed that the underwater ambient noise was highly correlated with the change of the ship's traffic volume, and that marine environment factors such as wind speed, wave height, and rainfall had an effect on a specific frequency band.

Low-resistance ohmic contacts to p-$Hg_{0.7}$$Cd_{0.3}$Te

김관,정한,김성철,이희철,김충기,김홍국,김재묵,Kim, Kwan,Chung, Han,Kim, Sung-Chul,Lee, Hee-Chul,Kim, Choong-Ki,Kim, Hong-Kook,Kim, Jae-Mook The Institute of Electronics and Information Engin 1994 전자공학회논문지-A Vol.31 No.10

Ohmic contacts between Au and p-HgHg_{0.7}Cd_{0.3}Te$ with low specific contact resistance have been obtained. The contact region of the wafer is first pre-heated for 5 seconds in a rapid thermal processing equipment. The temperature reaches a maximum value of about 200$^{\circ}C$ at the end of the 5 seconds. Next, a thin Au film is formed on the contact region by immersing the sample in AuCl$_{3}$ solution. the sample is then post-annealed in the same condition as the pre-heating after Pb/In pad metals are deposited on the electroless Au contacts. The specific contact resistance measured by transmission line model is 5${\times}10^{-3}{\Omega}cm^{2}$ at 80K. RBS and differential Hall measurement data suggest that the above low resistance ohmic contact is ascribed to surface traps and increased gold diffusion rate.

한국인의 영어 인식을 위한 문맥 종속성 기반 음향모델/발음모델 적응

오유리,김홍국,이연우,이성로,Oh, Yoo-Rhee,Kim, Hong-Kook,Lee, Yeon-Woo,Lee, Seong-Ro 대한음성학회 2008 말소리 Vol.68 No.-

In this paper, we propose a hybrid acoustic and pronunciation model adaptation method based on context dependency for Korean-English speech recognition. The proposed method is performed as follows. First, in order to derive pronunciation variant rules, an n-best phoneme sequence is obtained by phone recognition. Second, we decompose each rule into a context independent (CI) or a context dependent (CD) one. To this end, it is assumed that a different phoneme structure between Korean and English makes CI pronunciation variabilities while coarticulation effects are related to CD pronunciation variabilities. Finally, we perform an acoustic model adaptation and a pronunciation model adaptation for CI and CD pronunciation variabilities, respectively. It is shown from the Korean-English speech recognition experiments that the average word error rate (WER) is decreased by 36.0% when compared to the baseline that does not include any adaptation. In addition, the proposed method has a lower average WER than either the acoustic model adaptation or the pronunciation model adaptation.