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고립단어의 선형 예측 계수들 상호간의 상관도를 이용한 화자인식에 관한 연구
오예환,김중규 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.2
We propose a statistical algorithm which is applicable for speaker recognition and identification. The decision logic is formulated by computing the correlation coefficient between two speakers based on the LPC Log Spectrum and the LPC based Cepstral Spectrum of the speech signals. We tested the algorithm with Korean word "Sung Kyun Kwan" spoken by 11 male speakers, which is sampled at 16KHz rate and quantized to 16 bits. The test result showed very high recognition rates(94.5% for the case of LPC Log Spectrum and 98.2% for LPC based Cepstral Spectrum), whereas the conventional DTW algorithm based on the pitch contours of the speech signal had a relatively low recognition rate(89%). In addition to the recognition rate, the correlation method outperformed the DTW method in processing time as well, i.e. it requires much less computation load than DTW. Thus the proposed algorithm seems to have a strong potential to be applied to the areas where very high recognition rates as well as real time processing are required such as a security control system.
대학생의 배경특성에 따른 여가활동 장애요인 분석 : 대구·경북 지역을 중심으로 Centered on Taegu-Kyungbuk Areas
이예선 한국교육학회 대구·경북지회 2000 교육학논총 Vol.21 No.2
This thesis is aimed at leading a sound society by means of healthy leisure activities in the Korean societies. For this purpose, first, I approached to understand students' leisure activities, and then tried to reduce the obstacles of their activities through analyzing their causes. This approach will be achieved by teaching college students healthy and desirable leisure activities in Korean societies; and as a long-term purpose, it will guide sound leisure activities on the level of permanent education. In this thesis, I approached the obstacles of college students' leisure activities through (one-way Anova). And I categorized the causes of their obstacles into eight units: lack of time, lack of money, lack of information, lack physical activity, lack of volition, obstacle caused by college study, lack of leisure facilities, and lack of the opportunities of leisure activities. And I focused on the students' sex, grade, average monthly pocket money, income of their families, and their fathers' schooling as the responding college students' background characteristics. The results of the analyses are as follows: 1. According to the results of sex analysis, female students showed fewer leisure activities than male students on account of their less physical strength. It was revealed that the female students have a significant difference by the level of p<.05. And the female students also had fewer opportunities of leisure activities than male students, which revealed the significant difference of p<.05. 2. According to the results of grade analysis, it was revealed that lower grade students(freshmen) have limitations of leisure activities on account of their less information, and the result was the significant difference p<.01. 3. According to students' leisure activities based on family income, in the case of the students who are from lower than 1 million won monthly family income, they showed the limitation of leisure activities on account of lack of money and there was a significant difference of p<.05. And the limitation of leisure activities on account of lack of information revealed a significant difference by the level of p<.05, 4. The obstacles of students' leisure activities based on fathers' schooling showed the results that in case that fathers' schooling was college drop out or junior college graduation, their lack of information was the cause of a significant difference by the level of p<.05. However, the difference of students' pocket money was not the cause of a significant difference. The research result of this thesis concluded that in order to solve the problem of obstacles of students' leisure activities, in case of female students, we need to intensify their physical strength; and in case of freshmen, it is required to provide them with more various kinds of information of leisure activities. However, in case of the students from lower income families, for their desirable leisure activities, colleges or societies should show the students more concern and give them various opportunities of free leisure activities instead of monetary aid. Despite fathers' lack of schooling, when colleges or societies provide more various kinds of information of leisure activities, students will enjoy more sound and desirable leisure activities. The insufficient advanced researches gave this thesis much difficulty. However, I expect that continuous researches and studies of this area will lead to great scholarly development in the aspect of the permanent education.
압축성을 고려한 분율 흐름 접근 방식에 근거한 삼상흐름모델 개발
석희준,고경석,Suk, Hee-Jun,Ko, Kyung-Seok,Yeh, Gour-Tsyh 대한자원환경지질학회 2008 자원환경지질 Vol.41 No.6
대부분의 분을 흐름 접근 방식을 따르는 다상흐름모델들은 주로 유체나 매질의 비 압축성을 가정하거나 완전한 삼상 오염물을 다루지 않고 이상 유체 (물 또는 공기, 물 또는 불용융성유체)의 거동만을 다룬다. 그러나 본 연구에서는 유체 및 매질의 압축성과 완전한 삼상 오염물을 가정하는, 분율흐름접근방식을 따르는 수학적 지배방정식을 개발하고, 이를 토대로 압축성 유체 및 매질을 고려한 삼상흐름 수치모의프로그램을 개발하였다 개발된 삼상흐름 수치모의프로그램 (Compressible Multiphase Flow Simulator, CMPS)을 검증하기 위해서 기존에 개발된 비압축성 유체 및 매질을 고려한 삼상흐름수치모의 프로그램인 MPS (Suk and Yeh, 2007; Suk and Yeh, 2008) 및 해석해를 통해서 간접적으로 비교 검증하였다. 비교결과 CMPS와 MPS의 결과와 해석해들은 서로 잘 일치하였다. 따라서 CMPS는 압축성 유체 및 매질을 고려한 삼상흐름 수치모의를 구현 할 수 있는 가능성을 가진다. Most multiphase flow simulators following fractional flow approach assume incompressibility of fluid and matrix or consider only two phase flow (water and air, water and NAPL). However, in this study, mathematical governing equations were developed for fully compressible three-phase flow using fractional flow based approach. Also, fully compressible multiphase flow simulator (CMPS) considering compressibilities of matrix and fluid was developed using the mathematical governing equations. In order to verify CMPS, the CMPS were compared with analytical solution and the existing multiphase flow simulator, MPS, which had been developed for simulating incompressible multiphase flow (Suk and Yeh 2007; Suk and Yeh 2008). According to the results, solutions of CMPS and MPS and analytical solutions are well matched each other. Thus, it is found that CMPS has the capability of simulating compressible three phase flow phenomena assuming compressibilities of fluids and matrix.
Yeh, Hye Ryun,Lee, JooHoon,Park, Young Seo Korean Society of Pediatric Nephrology 2015 Childhood kidney diseases Vol.19 No.2
Objective: To find out clinical features and long-term outcomes of idiopathic childhood nephrotic syndrome(NS) patients with late steroid resistance(LSR)/late steroid sensitiveness(LSS). Patients and Methods: A retrospective chart review was performed on 480 patients diagnosed with idiopathic childhood NS at Asan Medical Center Children's Hospital from 1990 to 2013. Twenty-four patients whose responsiveness to steroids changed over a minimum 2 year follow-up period (2-17.5 years) were investigated. All patients had undergone a renal biopsy. Results: Among 480 nephrotic children, 428 (89%) were sensitive to the first steroid course. Of those who initially responded, 11 (2.5%) developed resistance to steroid therapy after relapses. LSR mostly developed between 1 month and 1 year after the initial episode. Six patients showed a minimal change and five showed focal segmental glomerulosclerosis (FSGS). Nine (82%) responded to cyclosporine or methylprednisolone pulse therapy. Of these, two had no further relapse, whereas the other seven experienced several relapses that ranged in length from 1.1 to 13.9 years. Three of the nine who initially responded to immunosuppression went on to experience several changes in steroid responsiveness. Two (18%) with resistance to immunosuppressants, including steroids, eventually progressed to end stage renal disease. Among the 52 patients (11%) who were initially steroid resistant, 13 (23%) were converted to steroid sensitive at relapses. Among these, 9 showed minimal change and 4 showed FSGS. Two had no further relapse and the other 11 responded to steroids on subsequent relapses ranging in length from 1.3 to 9.4 years. All these patients have had no further changes in steroid responsiveness with normal renal function. Conclusions: In this study, 2.5% of initial steroid responders and 25% of initial steroid non-responders changed their responsiveness to steroids at subsequent relapses. Eighteen percent of LSR patients developed end stage renal disease. All of the LSS patients showed preserved normal renal function. Responsiveness to immunosuppressants seemed to be the most important factor determining longterm outcomes in LSR/LSS patients.
( Yeh Rim Kang ),( Byung Woo Jhun ),( Kyeong Man Jeon ),( Won Jung Koh ),( Gee Young Suh ),( Man Pyo Chung ),( Ho Joong Kim ),( O Jung Kwon ),( Joung Ho Han ),( Sang Won Um ) 대한결핵 및 호흡기학회 2011 Tuberculosis and Respiratory Diseases Vol.71 No.5
Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is a useful, safe diagnostic modality for evaluating mediastinal and hilar lymphadenopathy. We report a 51-year-old male who presented with a left renal mass and multiple pleural masses without lung parenchymal lesions. The pleural masses were thought to be metastatic tumors or malignant mesothelioma. The patient underwent two percutaneous needle biopsies of the pleural mass, but the specimens were insufficient for a histopathological diagnosis. Because one pleural mass was adjacent to the right main bronchus, we decided to perform EBUS-TBNA for the pleural mass. As a result, sufficient core tissue was obtained with no complications, and the histopathological findings were consistent with metastatic papillary renal cell carcinoma. To our knowledge, this is the first case of using EBUS-TBNA for a pleural mass.
Hybrid Constant Pressure Control of a Swash Plate Type Axial Piston Pump
Yeh-Sun Hong,Jong-Hyeok Kim 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
In this paper both the volumetric displacement and the shaft speed of a variable displacement swashplate type piston pump were varied in order to minimize power consumption in supplying constant-pressure oil to a valve-controlled hydraulic cylinder, particularly during idle modes. At operating modes which were triggered by position command inputs, the pump speed was varied by a pressure control algorithm to maintain a constant system pressure, with the swash plate angle fixed at the maximum. At idle, with no position controller input signal and the system pressure greater than or equal to the reference value, the swash plate angle and pump speed were lowered to their minimum limits. Computer simulation and experimental results showed that the idling power could be reduced by up to 83% by reducing the pump speed from 1800 rpm to 300 rpm and the swash plate angle to 3°, compared to a conventional system consisting of a pressure-compensated variable displacement type pump driven at a constant speed of 1800 rpm.
Contributions of Asian pollution and SST forcings on precipitation change in the North Pacific
Yeh, Sang-Wook,So, Jihyeon,Lee, Jong-Won,Kim, Minjoong J.,Jeong, Jaein I.,Park, Rokjin J. Elsevier Science Publishers 2017 Atmospheric research Vol.192 No.-
<P><B>Abstract</B></P> <P>East Asia has a significant concentration of pollutant aerosols, mostly due to rapid industrialization. Previous research indicates that the aerosol effect from Asian pollution outflow could account for the trend of increasing deep convective clouds, as well as an intensification of the storm track, over the North Pacific Ocean in winter since the mid-1990s. However, it is not clear whether such change is solely due to Asian pollutant forcings or not. To understand the relative roles of Asian pollutant aerosols and sea surface temperature (SST) forcings on the precipitation change in the North Pacific, we examine the interannual variation of particulate matter 2.5 (PM<SUB>2.5</SUB>) simulated in the global chemical transport model (GEOS-Chem) and the idealized experiments using the Community Atmosphere Model version 5 (CAM5) for 1986–2010. The composite analysis indicates that the changes in precipitation amount and storm track intensity in the southwestern North Pacific might be associated with the increase in PM<SUB>2.5</SUB> concentration in East China. However, El Niño-like warming during the years of high PM<SUB>2.5</SUB> concentration may also influence the precipitation amount, as well as the storm track intensity in the central and eastern North Pacific. Model experiments also indicate that the El Niño-like warming and the Asian pollutant aerosols have different effects on precipitation amounts in the North Pacific. Therefore, the precipitation changes, as well as the intensification of the storm track, in the North Pacific might be attributed to both Asian pollutant aerosols and SST forcing in the tropics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Previous argument that the precipitation and storm track in the North Pacific is largely influenced by Asian pollutant forcings is re-examined. </LI> <LI> The changes in precipitation amount and storm track intensity in the North Pacific might be associated with the increase in PM<SUB>2.5</SUB> concentration in East China. However, El Niño-like warming during the years of high PM<SUB>2.5</SUB> concentration may also influence the precipitation amount, as well as the storm track intensity. </LI> <LI> Idealized model experiments are conducted and the result also indicate that the El Niño-like warming and the Asian pollutant aerosols have different effects on precipitation amounts in the North Pacific. </LI> <LI> The precipitation changes, as well as the intensification of the storm track, in the North Pacific might be attributed to both Asian pollutant aerosols and SST forcing in the tropics. </LI> </UL> </P>