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A Study on Pitch Period Detection Algorithm Based on Rotation Transform of AMDF and Threshold
서현수,김남호,Seo, Hyun-Soo,Kim, Nam-Ho The Korea Institute of Convergence Signal Processi 2006 융합신호처리학회 논문지 (JISPS) Vol.7 No.4
As a lot of researches on the speech signal processing are performed due to the recent rapid development of the information-communication technology. the pitch period is used as an important element to various speech signal application fields such as the speech recognition. speaker identification. speech analysis. or speech synthesis. A variety of algorithms for the time and the frequency domains related with such pitch period detection have been suggested. One of the pitch detection algorithms for the time domain. AMDF (average magnitude difference function) uses distance between two valley points as the calculated pitch period. However, it has a problem that the algorithm becomes complex in selecting the valley points for the pitch period detection. Therefore, in this paper we proposed the modified AMDF(M-AMDF) algorithm which recognizes the entire minimum valley points as the pitch period of the speech signal by using the rotation transform of AMDF. In addition, a threshold is set to the beginning portion of speech so that it can be used as the selection criteria for the pitch period. Moreover the proposed algorithm is compared with the conventional ones by means of the simulation, and presents better properties than others.
하악 과두하 골절시 구강내 접근의 문헌 고찰과 임상 연구
서현수,홍순민,유승은,박준우,Seo, Hyun-Soo,Hong, Soon-Min,Yoo, Seung-Eun,Park, Jun-Woo 대한구강악안면외과학회 2008 대한구강악안면외과학회지 Vol.34 No.6
Purpose: The aim of this study was to investigate the clinical cases of subcondylar fracture with intraoral approach. Material and Method: Fifteen patients with unilateral subcondylar fracture were treated in the department of oral and maxillofacial surgery, Kangdong Sacred Heart Hospital, College of Medicine, Hallym University between 2006 and 2007. Each patients was examined by computed tomography(CT) and panorama. 3D-CT taken when fractured segment was displaced and comminuted. Patients was done intermaxillary fixation to occlusal stability and prevent displacement of fractured segment before general operation. Open reduction and internal fixation(ORIF) accomplished under general anesthesia and used to intraoral approach. We examinated the state of occlusion, maximum opening. Evaluation of the state of occlusion was divided in patient`s subjective evaluation that compare pre-traumatic occlusion with postoperative occlusion, and estimator`s objective evaluation that use articulating paper. Examination was done at 2 weeks, 1, 3, 6 month postoperative by follow up. Result: The ORIF through intraoral approach was good in all patients. In the state of occlusion, all patients recovered pre-traumatic occlusion in 6 month postoperation. Maximum opening was gradually increased. In 3 month postoperative, maximum opening was excessed 40mm. Conclusion: Our study indicate that the intraoral approach is a good technique for subcondylar fracture. Intraoral approach prevent complication that facial nerve damage, scar formation caused by extraoral approach. So, we recommend intraoral approach when subcondylar fracture.
이부 비대칭 치료를 위한 새로운 이부 성형술의 소개 - 전환 이부성형술: 증례보고
서현수,이영주,변광섭,홍순민,박준우,홍지숙,박양호,Seo, Hyun-Soo,Lee, Young-Joo,Byeon, Kwang-Seob,Hong, Soon-Min,Park, Jun-Woo,Hong, Ji-Sook,Park, Yang-Ho 대한악안면성형재건외과학회 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.1
Conventional slinding genioplsty has the risk of mental nerve injury after operation and difficult to correct vertical asymmetry of chin. So, authors propose a new genioplasty to correct asymmetry of chin. Switching genioplasty is a modification method of conventional genioplasty. Between mandibular right and left canine, osteotomy line of triangular shape make until mandibular lower border. In large side, osteotome line of wedge shape is added to reduction. After osteotomy, segment of wedge shape was separated from chin. Distal segment was rotated to reduction side. Because of rotation of distal segment, space is made in opposite side. Seperated segement of wedge shape from large side is switched this space to fill. So, stability of distal segment is achieved. Authors applied to swiching genioplasty the patients who was remained the chin asymmetry after both sagittal split ramus osteotome was done because mandible asymmetry. After operation, patient and operator were satisfied with excellent esthetic results without any other complication. The switching genioplasty is effective surgical technique for chin asymmetry because it has more advantages than conventional sliding genioplasty. First, other donor side does not need for bone graft. Second, the switching genioplasty can reduce infection, bone resroption, dehiscence, capsular contraction after allograft. Third, have little mental nerve damage. Forth, anteroposterior correction is possible. Fifth, operation time is less than other genioplasty for chin asymmetry.
서현수,배상범,김남호,Seo Hyun-Soo,Bae Sang-Bum,Kim Nam-Ho 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.1
피치 주기는 음성 인식, 화자 식별, 음성 분석 및 합성 등과 같은 음성 신호 처리 분야에 있어서 중요한 요소이며, 이러한 피치 주기 검출에 관련된 다양한 알고리즘이 지금까지 연구되고 있다. 피치 검출에 사용되는 알고리즘의 하나인 AMDF(average magnitude difference function)는 각 계곡점의 거리를 피치 주기로 계산한다. 이때, 피치 주기 검출을 위한 계곡점 선정에 있어서 알고리즘이 복잡해지는 문제점이 발생한다. 따라서 본 논문에서는 AMDF의 회전변환을 이용하여 전체 최소 계곡점을 음성 신호의 피치 주기로 검출하는 간단한 알고리즘을 제안하였으며, 시뮬레이션을 통해 기존의 방법들과 비교하였다. Pitch period that is a important factor in speech signal processing is used in various applications such as speech recognition, speaker identification, speech analysis and synthesis. So many pitch detection algorithms have been studied until now. AMDF which is one of pitch period detection algorithms chooses the time interval from valley point to valley point as pitch period. In selection of valley point to detect pitch period, complexity of the algorithm is increased. So in this paper we proposed the simple algorithm using rotation transform of AMDF that detects global minimum valley point as pitch period of speech signal and compared it with existing methods through simulation.
Cr-free 코팅액에 의한 아연도금강판의 열처리 온도에 따른 내식특성
서현수(Hyun-Soo Seo),문희준(Hee-Joon Moon),김종순(Jong-Soon Kim),안석환(Seok-Hwan Ahn),문창권(Chang-Kwon Moon),남기우(Ki-Woo Nam) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.5
Zinc has a number of characteristics that make it well suited for use as a coating to protecting iron and steel products from corrosion. Its excellent corrosion resistance in most environments accounts for its successful use as a protective coating on a variety of products and in many exposure conditions. The excellent field performance of zinc coatings results from their ability to form dense, adherent films that corrode at a rate that ranges from 1 % to 10% of the corrosion rate of ferrous materials, depending on the environment. Recently, EU RoHS and EU ELV prohibited the use of materials that adversely affect the environment, such as Pb, Hg, Cd, and Cr??. In this study, environmentally-friendly, Cr-free solutions (epoxy solution, acrylic solution, and urethane solution S-700) and organic/inorganic solution with Si; LRO-317) were used to evaluate the corrosion resistance of zinc-coated steel subjected to a saltwater spray for 72 hours. The coating of urethane solution (S-700) was best among the three kinds of solution with heat treatment during five minutes at 190℃. Test specimens with S-700 and LRO-317 coating were heat treated in a drying oven at 170, 180, 190, 200, and 210℃ for five minutes. The results show that the optimum corrosion resistance was 190℃ in EGI and 170℃ in HDGI, respectively.
Kano모델과 PCSI지수를 이용한 국방품질보증활동 서비스품질에 관한 연구
서현수 ( Seo Hyun-soo ),김현민 ( Kim Hyun-min ) 한국품질경영학회 2017 한국품질경영학회 학술대회 Vol.2017 No.1
Purpose: 군수품에 대한 품질보증업무를 서비스품질 속성으로 분류하고, 고객만족계수 산출을 통하여 고객만족도 향상을 위해 개선이 필요한 서비스 요소를 도출하고자 함. Methods: 부산, 경남 지역 소재의 군수업체 종사자를 대상으로 설문조사를 통하여 군수품에 대한 품질보증업무를 Kano 모형에 근거한 서비스품질로 분류하고, 국방품질보증 서비스품질에 대한 현재의 고객만족도 조사와 고객만족계수 및 잠재적 고객만족 개선지수를 산출함. Results: 국방품질보증 서비스품질에 대한 현재의 만족수준을 파악하고, 대업체 고객만족도 향상을 위해 개선해야할 서비스품질 요소를 제시함. Conclusion: 국방품질보증업무에 대한 매력적인 서비스품질 요소는 13개로 분류되었으며, 고객만족계수는 만족계수보다 불만족계수가 상대적으로 낮은 수준으로 나타났으며, 잠재적 고객만족 개선지수를 통해 고객의 현재 만족도 수준에서 살펴볼 때 PCSI 지수가 큰 매력적인 품질 요소들은 서비스 개선방안이 필요한 것으로 확인되었다.