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해상풍력 구조물 설계를 위한 제주도 월정지역 풍황특성 분석
서현수,경남호,김현구 한국풍공학회 2010 한국풍공학회지 Vol.14 No.3
The long-term wind data were regenerated from short-term met-tower data using a Measure-Correlate-Predict (MCP) method to prepare a design dataset for the 4MW offshore wind farm, which is being constructed at the Waljeong sea front, Jejudo. Two reference sites - the Jeju and Gujwa observation stations - and two MCP models - linear regression and matrix MCP - were tested. The results of a quantitative error analysis showed that Gujwa and the matrix MCP gave the best combination for long-term correction. Normal Turbulence Model (NTM) and Extreme Wind Model (EWM) analyses were performed with the regenerated Waljeong wind data to determine the class of the wind turbine type. According to the recommendation of the DNV Offshore Standard, the characteristic wind turbulence is estimated by the ninety-percent percentile of the standard deviation in the probability distribution. The 10-minute extreme wind speed of a 50 year return period was estimated using a Gumbel distribution of 8.5 year reconstructed Waljeong data. Therefore, the wind turbine type was found to be class II A. 제주도 월정 앞바다에서 건설 중인 4MW 해상풍력단지의 설계자료를 준비하기 위하여 측정-상관-예측(MCP) 방법을 이용하여 단기간 풍황탑 자료로부터 장기간 풍황자료를 재생산하였다. 두 참조지점으로서 제주, 구좌 기상관측소와 선형회귀 MCP, 행렬 MCP 조합에 대한 정량적 오차분석을 실시한 결과 구좌와 행렬 MCP에 의한 장기간 보정이 가장 최선의 조합임을 도출하였다. 재생산된 풍황자료를 이용하여 월정해상 풍력발전기의 형식등급을 결정하기위한 표준난류모델 및 극한풍속모델 해석을 수행하였다. 50년 회귀주기의 10분-단위 극한풍속을 예측하기 위해 재생산된 8.5년의 월정 풍황을 검블 분포로 해석하였다. 이에 의하여 결정된 풍력발전기 형식등급은 II A인 것으로 나타났다.
A Study on Pitch Period Detection AlgorithmBased on Rotation Transform of AMDF and Threshold
서현수,김남호 한국융합신호처리학회 2006 융합신호처리학회 논문지 (JISPS) Vol.15 No.1
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.
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,권민호,임정희 한국복합신소재구조학회 2014 복합신소재구조학회논문집 Vol.5 No.1
In the study, tensile, compression and in-plane tests about longitudinal direction of glass fiber were performed. Also, to obtain the material properties of GFRP fabric composite, tensile test was performed. All test were performed by the test method of ASTM. Maximum compressive strength was smaller than the maximum tensile strength at the longitudinal direction test results. Elastic modulus of the tensile and compressive was almost similar at the compression test results in the longitudinal direction. Based on the GFRP fabric composite test results, GF91 was showed good performance at maximum compressive, maximum strain and elastic modulus.
깨달음 과정에서 나타나는 신비주의 체험과 초감각적 명상법에 대한 고찰
서현수 한국정신과학학회 2018 한국정신과학회 학술대회 논문집 Vol.2018 No.11
인간이 새로운 앎을 획득하는 과정을 살펴보면 ‘신비주의’ 혹은 ‘신비체험’이라고 알려진 종교전통과 매우 흡사하다는 것을 알 수 있다. 궁극적 근원 혹은 우주와 인간에 대한 일원론적 체험으로 이해할 수 있는 신비체험은 일상적이지 않은 변형된 의식상태에서 나타난다. 카톨릭의 테레사와 에크하르트, 동학의 창시자인 수운 최제우의 경우 신비체험을 통해 종교적/사상적 체계를 적립한 중요한 인물들이다. 그리스 아테네 파르테논 신전 터에서 강렬한 신비주의적 체험을 한 르 코르뷔지에 또한 신비체험과 비범한 앎의 관계를 보여주는 중요한 사례이다. 습관화된 감각적 인식의 틀을 벗어나기 위해 여러 종교 제도적 명상법들이 많이 있으나 형식적이며 이론적인 틀에 치우쳐있는 것들이 많다. 본 논문에서는 다양한 종교제도, 문화권, 그리고 일상에서 나타난 신비체험의 공통점을 통해 신비주의 체험의 보편적 가치를 분석하고, 그 가치를 실제 삶에서 드러내는 방식을 분석한다.