• 한국산학경영학회:학술대회논문집
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• 한국산학경영학회 2005년도 추계학술발표대회 발표논문집
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• pp.1-9
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• 2005

Job search research has been criticized for failing to study the dynamics and change of the job search process. A lot of previous researches have used cross-sectional designs and treated job search as a static process. As a result, job search research has failed to examine how job seekers' behaviors change during the course of their search. This paper examined changes In job search behaviors(preparatory and active job search behavior, and job search intensity) and the effects of individual difference variables(self-esteem, self-efficacy, extroversion, agreeableness, conscientiousness, openness) on job search behaviors. Data were gathered from 404 university students who had not found employment at the time of beginning of second semester The results of t-test pairs indicated that job seeking students increased their preparatory job search behavior and active job search behavior, but didn't job search intensity. The results of multiple regression showed that self-efficacy had strong relationship with preparatory and active job search behavior, and job search intensity, but self-esteem had not any relationship with them. Among big-5 personality, extroversion had relationship with active job search behavior and job search intensity, and agreeableness only with job search intensity.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집A
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• pp.165-169
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• 2000

A simple method was suggested to calculate the stress intensity factor for a one-sided patched crack with finite thickness. To consider out-of-plane bending effect resulting from the load-path eccentricity, the spring constant as a function of the through-thickness coordinate z was calculated from the stress distribution in the un-cracked plate, ${\sigma}_{yy}(y=0,\;z)$, and the displacement for the representative single strip Joint, $u_y(y=0,\;z)$. The stress Intensity factors were obtained using Rose's asymptotic solution approach and compared with the finite element results. In short crack region, two results had a little difference. However, two results were almost same in long crack region. On the other hand, the stress intensity factor using plane stress assumption was more similar to finite element result than plane strain condition.

• Journal of Advanced Marine Engineering and Technology
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• 제23권4호
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• pp.473-479
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• 1999

The two-microphone sound-intensity technique has been used for the detection of defects in ra-ally loaded ball bearings. The difference in the sound-intensity levels measured for bearings with no defect and for those with intentionally introduced defects of different sizes n heir elements under various operating conditions of loads and speeds is demonstrated. The results show that of an inner-race or ball defect. It is difficult to detect defects at lower speeds. Sound-pressure measurements were also performed for comparison and it shown that the detectability of defects by sound-intensity measurements is better than that by sound-pressure measurements.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1999년도 춘계학술대회 논문집
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• pp.222-228
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• 1999

The two-microphone sound-intensity technique has been used for the detection of defects in radially loaded ball bearings. The difference in the sound-intensity levels measured for bearings with no defect and for those with intentionally introduced defects of different sizes in their elements under various operating conditions of loads and speeds is demonstrated. A change in the intensity frequency spectrum because of the defects is observed. The results show that the detectability of an outer-race defect is much better than that of on inner-race or ball defect. It is difficult to detect defects at lower speeds. Sound-pressure measurements were also performed fur comparison, and it is shown that the detectability of defects by sound-intensity measurements is better than that by sound-pressure measurements.

• 대한지리학회지
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• 제46권1호
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• pp.36-49
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• 2011

본 연구에서는 오호츠크해고기압이 한반도에 영향을 미치는 날과 강도의 변화를 규명하고자 하였다. 지상 일기도와 기상자료, 재분석자료 등을 분석하여 다음과 같은 결과를 얻었다. 4월의 주변 육지기온이 높은 해일수록 오호츠크해고기압의 첫 출현일이 일러지는 경향이다. 최근 오호츠크해고기압의 출현일수는 감소하였으며, 그 강도는 6월 해수면온도와 주변 육지기온의 차이가 클수록 강해지는 경향이다 4 5월, 6월, 7월의 오호츠크해고기압 출현일수는 주변 육지기온이 상승할수록 증가하며, 해수면온도와 주변 육지 기온의 차이가 커질수록 강도가 강해진다. 오호츠크해고기압의 첫 출현일이 일러짐에 따라 4월과 5월의 오호츠크해고기압 출현일수는 증가하고 강도는 약해질 수 있다. 그러나 6월에는 반대의 경향이 나타날 수 있다.

• 음성과학
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• 제10권4호
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• pp.189-200
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• 2003

The objective of this study was to examine two new parameters by which we could screen people with malignant vocal folds. The new parameters were the difference sums and Pearson correlation coefficients between adjacent pairs of intensity level matrices of narrow-band spectra. Audio files from the Korean Disordered Speech Database were analyzed by Praat, a speech analysis software, to obtain matrices of 400 intensity levels at 16 time points of each sustained vowel spectra. We limited our study to 12 normal subjects and 20 patients with malignant vocal folds who recorded at least three Korean vowels at a sound-proofed booth in Busan National University Hospital. Results indicated that the average coefficients of the abnormal subjects were much lower than those of the normal subjects while the average difference sums of the patients were much higher than those of the normal ones. Also, we found that the degree of the malignancy of the vocal folds was related to the coefficients and sums. However, some subjects at the initial stages of cancerous vocal folds yielded almost comparable coefficients and difference sums to those of the normal speakers. Further studies on larger databases will be desirable to set certain criteria or threshold levels for screening people with vocal fold diseases.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권6호
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• pp.2098-2114
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• 2021

Light intensity variation is one of the key factors which affect the accuracy of vehicle face re-identification, so in order to improve the robustness of vehicle face features to light intensity variation, a Nonnegative Matrix Factorization model with the constraint of image acquisition time difference is proposed. First, the original features vectors of all pairs of positive samples which are used for training are placed in two original feature matrices respectively, where the same columns of the two matrices represent the same vehicle; Then, the new features obtained after decomposition are divided into stable and variable features proportionally, where the constraints of intra-class similarity and inter-class difference are imposed on the stable feature, and the constraint of image acquisition time difference is imposed on the variable feature; At last, vehicle face matching is achieved through calculating the cosine distance of stable features. Experimental results show that the average False Reject Rate and the average False Accept Rate of the proposed algorithm can be reduced to 0.14 and 0.11 respectively on five different datasets, and even sometimes under the large difference of light intensities, the vehicle face image can be still recognized accurately, which verifies that the extracted features have good robustness to light variation.

• 한국멀티미디어학회논문지
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• 제16권2호
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• pp.169-179
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• 2013

변화 검출 알고리즘은 두 영상 프레임을 비교하여 변화를 가져온 유입된 외부 객체의 영역을 검출 하는 것이다. 본 논문은 두 영상 간의 밝기 변화 요인을 유입 객체에 의한 요인, 객체의 표면에서 주변으로 반사된 반사광 및 그림자에 의한 요인, 내재된 잡음에 의한 요인 등으로 분류하고, 이를 바탕으로 유입된 객체의 영역을 정확하게 검출하는 새로운 변화 검출 방법을 제안한다. 변화 요인의 분류와 객체 영역의 검출을 위하여, 우선 두 영상 간의 밝기 변화 값의 히스토그램을 분석하여 다수의 임계값을 추정한다. 다음으로 유입 객체의 경계 후보 화소를 추정하고, 추정된 객체 경계 후보 화소와 임계값을 이용하여 영상을 다수의 영역으로 분할한다. 최종적으로 분할된 각 영역의 텍스처를 두 영상에서 각각 구하고 이들 간의 유사도를 이용하여 각 영역이 외부 유입 객체 영역인지 아닌지를 판단한다. 다른 조명 변화 특성을 가지는 다수의 영상에서 수행된 실험을 통하여 제안한 방법이 유입된 객체의 영역을 강인하게 검출함을 보여준다.

• 한국지능시스템학회논문지
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• 제25권5호
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• pp.483-488
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• 2015

본 논문에서는 질감분류를 위해 블록영상 내에서 인접 화소사이의 다차원 명암차이를 이용한 local binary pattern(LBP) 기법을 제안한다. 여기서 블록영상 내 화소 간 명암차는 4방향(세로, 가로, 대각, 역대각) 각각의 인접 화소 간 밝기변화를 고려한 것으로 영상의 질감분류에 이용되는 히스토그램의 레벨수를 감소시켜 계산 부하를 줄이기 위함이다. 또한 블록 내 명암관계를 이진패턴으로 나타낸 것으로 영상의 국부적 속성을 더욱 더 정확하게 반영하여 효과적인 질감분류를 가능하게 함이다. 제안된 기법을 128*128 픽셀의 그레이 영상 USC Texture Mosaic #2을 대상으로 크기와 질감이 다른 24개의 블록영상 각각을 분류하는 실험결과, 기존의 LBP에 비해 빠른 분류속도를 가지며, 임의 크기 블록영상의 분류도 가능함을 확인하였다. 특히 블록영상의 크기가 증가할수록 히스토그램의 레벨 감소폭이 더욱 더 크게 되어 분류속도의 개선정도도 증가함을 알 수 있다.

• 대한후두음성언어의학회지
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• 제22권2호
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• pp.143-150
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• 2011

Background and Objectives : Clinically, as a tool for voice assessment before and after the operation or the voice treatment, acoustic analysis is widely used. However, in clinical situations, acoustic parameters vary according to how the assessment is made. Thus, with voice disease patients as subjects, we are to investigate what influence intensity increase exerts on acoustic parameters and how to reduce variation according to the way of assessing. Material and Method : At the voice clinic of the department of otorhinolaryngology in Gangnam Severance Hospital, with 30 female voice-disease patients (40.6 years old on the average) and 23 male voice-disease patients (40.1 years old on the average) as subjects, using the Dr Speech vocal-assessment program, we statistically tested the significance of the difference in each of acoustic parameters between when the "Ah" vowel is produced with a normal voice and when the "Ah" vowel is produced with a loud voice. Results : Acoustic parameters that showed a statistically significant difference according to intensity increase were Jitter, SD F0, and NNE for females, and Jitter, SD F0, HNR, SNR, and NNE for males. Voice quality estimates showed a statistically significant difference according to intensity increase in female hoarse voice, female breathy voice, and male breathy voice. Conclusion : In this research, acoustic analysis, which is generally used for voice assessment before and after the operation or the voice treatment, showed a tendency that acoustic parameters became better under the influence of intensity increase except for the cases where a voice disease was severe. Thus, to raise the reliability of voice assessment, the range of intensity needs to be set up. This should be the topic for the future research.