• Journal of the Korea Society of Computer and Information
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• v.28 no.1
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• pp.87-92
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• 2023

With the continuous development of the speech recognition system, the recognition rate for speech has developed rapidly, but it has a disadvantage in that it cannot accurately recognize the voice due to the noise generated by mixing various voices with the noise in the use environment. In order to increase the vocabulary recognition rate when processing speech with environmental noise, noise must be removed. Even in the existing HMM, CHMM, GMM, and DNN applied with AI models, unexpected noise occurs or quantization noise is basically added to the digital signal. When this happens, the source signal is altered or corrupted, which lowers the recognition rate. To solve this problem, each voice In order to efficiently extract the features of the speech signal for the frame, the MFCC was improved and processed. To remove the noise from the speech signal, the noise removal method using the Gaussian model applied noise deviation estimation was improved and applied. The performance evaluation of the proposed model was processed using a cross-correlation coefficient to evaluate the accuracy of speech. As a result of evaluating the recognition rate of the proposed method, it was confirmed that the difference in the average value of the correlation coefficient was improved by 0.53 dB.

• The Korean Journal of Financial Management
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• v.17 no.1
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• pp.307-332
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• 2000

본 연구는 총 26개의 시중은행과 지방은행을 대상으로 설문조사를 통해 국내 은행의 위험관리 실태를 분석하였다. 나아가 정상은행과 경고은행 및 퇴출은행의 위험관리 행태에 차이가 있는 지를 살펴보았다. 조사 결과, 최고경영자나 임원이 위험관리 부서의 책임자로 있는 경우는 없고, 금융파생상품의 사용 등 관련사항의 보고가 효과적으로 이루어지지 않고, 감사위원회 역시 외부전문가를 둔 은행이 전혀 없는 것으로 조사되어 경영층의 위험관리 인식에 문제가 있는 것으로 나타났다. 위험관리에 관한 평가나 최고경영자에 대한 보고주기도 일정하지 않은 경우가 많았다. 위험 유형별로는 신용위험, 시장위험 및 유동성위험을 잘 인식하고 있는 반면, 운영위험이나 법적 위험에 대한 인식은 부족하였다. 위험관리 담당자의 교육 주기가 비정기적으로 이루어지고 있다고 응답한 경우가 60%로 가장 높았으며, 40%의 은행이 법적 위험 발생 시 책임소재가 분명하지 않다고 응답하였다. 시장위험 관리에 있어서도 매일 VaR값과 실제 손익을 정기적으로 비교한다고 응답한 경우는 15%에 불과하여 취약성을 드러냈다. 절반 정도의 은행은 금융파생상품을 전혀 이용하지 않고 있었다. 흥미롭게도 정상은행과 비정상은행 간 또는 비퇴출은행과 퇴출은행 간에 일부 항목을 제외하고는 행태 차이가 없었다. 결론적으로, 국내 은행의 위험관리는 전반적으로 미흡하여 체계적인 위험관리 시스템의 구축이 요구된다고 하겠다. 특히, 위험관리에 대한 최고경영층의 인식 제고가 요망되며, 합리적 은행구조조정을 위해서는 당해 은행의 위험관리 실태와 그에 따른 경영책임을 파악해야 할 것이다.

• Proceedings of the Korea Multimedia Society Conference
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• 2004.05a
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• pp.163-166
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• 2004

본 논문은 3차원 형상 인식시스템으로부터 스캔 한 3차일 영상 데이터의 깊이정보에 3차원 에지를 추출하여 워터마크를 삽입하는 알고리즘을 제안한다. 제안한 알고리즘에서는 3차원 수직 평형 형상 인식기로 object scanning을 한 데이터 값들을 추출한다. 이 추출된 값들의 특성은 2차원 영상 즉 x, y축에 각각의 픽셀에 깊이정보를 가지는 3차원영상으로서 기존의 3차원영상과는 다른 차이를 가지며 영상의 품질이 우수하며 많은vertex 정보와 메쉬 정보를 가지고 있다. 따라서 획득된 데이터에서 x좌표와 y좌표는 영상에 있어서 위치를 나타내는 정보이고, T좌표는 3차원영상을 형성하는 깊이 정보들이다. 3차원 형상 인식시스템에서 스캔 한 3차원 얼굴영상으로부터 에지를 검출하여 에지가 존재하는 위치에 워터마크를 삽입하는 알고리즘을 제안하였다. 본 논문에서 제안한 워터마킹 알고리즘의 성능 평가를 위한 모의실험 한 결과 워터마크가 삽입된 모텔의 절단(cropping), 리메쉬(remesh) 및 메쉬간소화(mesh simplification) 공격에 대한 견고성이 우수함을 확인함으로써 3차원형상 인식 시스템에 직접적인 워터마크 삽입이 가능함을 증명하였다.

• Journal of Science Education
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• v.47 no.1
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• pp.88-106
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• 2023

This study aims to investigate the disparity between the teacher's perception of student-centered inquiry classes and the actual implementation of such practices. Specifically, we compared an elementary science teacher's self-perception of her science lessons with the observers' evaluation using the Reformed Teaching Observation Protocol (RTOP) of the "Temperature and Heat" unit. Research data were collected through classroom teaching survey, interview, and science lessons video which were analyzed using the RTOP. As a result of the study, the teacher recognized that she was practicing inquiry-oriented/student-centered classes, but the results judged by the RTOP score were found to be transitional/student-affected classes by a slight difference. Teacher H planned and practiced classes based on a high understanding and content knowledge of the curriculum and created a science classroom culture that promotes active interaction among students as well as students and teachers. However, teacher-led aspects were still emphasized in teaching design and implementation, and the project theme and content were inappropriate to improve the quality of students' science inquiry experience. In the end, the slight difference between teacher's perception of inquiry-oriented/student-centered classes and actual implementation is related to how student-centered "lesson design" is and how to plan and implement classes supported by "procedural knowledge" for students' experience in the science inquiry process. These results indicate that the teacher's self-evaluation alone is not enough to determine whether the teacher's intentions and efforts are actually being implemented, and that it is necessary to conduct objective analysis, evaluation, and discuss the results of science classes by the external observers.

• Journal of Science Education
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• v.34 no.2
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• pp.359-368
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• 2010

The purpose of this study was to find out the factor that causes the difference on understanding the aim and perception of laboratory activities between teachers and students. For this study, in-depth interview was conducted for sixth grade students and teachers of 10 classes. The questionnaire of the interview can be divided into 3 sections: the aim of laboratory activities, whether teachers present the aim of laboratory activities, the method of laboratory class progress and the evaluation method. The factors that bring about the difference between the teachers and the students on perception of the aim are the absence of proper guidance on the aim of laboratory activities, the laboratory classes that the progress out of teachers' intention and evaluation method that is the performed without any relationship with the aim of the laboratory activities. Because the teacher-intended aim of laboratory activities is not properly presented, students can't percept the accurate aim. Even though teachers recognize the importance of the improvement of science process skill acquired through laboratory activities, this is not delivered practically in the class and students also can't percept the importance of science process skill.

• Journal of the Korean Society of Food Science and Nutrition
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• v.35 no.10
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• pp.1491-1497
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• 2006

The purpose of this study was to analyze the relationship among inpatients' perceptions of foodservice quality, satisfaction and revisit intention. Questionnaires were hand-delivered to 350 inpatients and a total of 230 questionnaires were usable (response rate 65.7%), Statistical data analysis was completed using the SPSS Win 11.0 for descriptive analysis, independent t-test, $x^2$ test and k-means cluster analysis. The results of this study can be summarized as follows: The average score of overall importance of meal service in medical service was 4.25 out of 5.0, yet the score of overall quality of meal service and value had lower than importance score. A helpfulness to medical treatment (3.48), bringing customer happiness (3.18), overall satisfaction for foodservice (3.66), satisfaction based on expectation before discharge (3.53) and offering foodservice apt to hospital reputation (3.40) were measured as expressions of satisfaction. As a result of clustering analysis, two clusters were classified and named as affirmative opinion group and negative one. Expectation for four factors of foodservice quality between two groups had no significance. But affirmative opinion group had significantly higher score than negative one in perception and satisfaction. Affirmative customers' intention to revisit in the near future was evaluated as high in both considering general medical service (4.04) and reflecting meal service level (3.84).

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.6
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• pp.1209-1214
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• 2016

LPR(License plate recognition) is a kind of the most popular surveillance technology based on accompanied by a video and video within the optical character recognition. LPR need a many process. One is a localization of car license plates, license plate of size, space, contrast, normalized to adjust the brightness, another is character division for recognize the character optical character recognition to win the individual characters, character recognition, the other is phrase analysis of the shape, size, position by year, the procedure for the analysis by comparing the database of license plate having a difference by region. In this paper, describing the results of performance of license plate recognition S/W, which was implemented using EmguCV, find the location, using the tesseract OCR, which are well known to an optical character recognition engine of open source, the characters of the license plate image capturing angle of the plate, image size, brightness.

• Journal of Korea Technology Innovation Society
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• v.17 no.2
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• pp.289-308
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• 2014

We analyze the risk factors identified for ex-ante evaluation regarding government R&D programs. In particular, we empirically examined to what extent each risk factor is perceived to be important by the stage of R&D, technology field, researcher's career and experience. The empirical results show that technology risk is perceive to be less important for basic research, while market risk more perceived to be important in the IT field. Political risk is perceived to be less important for the university faculty, while researchers with government R&D project experience gave more value to legal risk factor.

• Proceedings of the International Microelectronics And Packaging Society Conference
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• 2002.05a
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• pp.219-223
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• 2002

전자부품의 고성능화 고집적화를 위한 표면실장기술의 발전과 환경과 건강에 대한 관심의 증가로 땜납 중의 납의 독성과 그에 따른 납 사용 규제 움직임과 선진국의 법규제에 대응 하여 무연 땜납이 개발되고 있다. 본 연구는 이러한 배경에서 무연 땜납용 볼에 관한 기술정보의 유용성의 제고와 객관적인 비교평가를 위한 표준을 제시하는데 그 목적이 있다. 본 연구에서는 납점용 볼의 표준화 현황을 조사하고, 기업을 대상으로 설문조사를 실시하여 납땜용 볼에 대한 인식과 표준화 현황을 조사하였다. 또, 기존에 납땜용 볼에 관하여 발표되었던 자료들을 조사하여, 유연.무연 납땜용 볼의 품질특성과 그 평가방법을 비교하여 연구하였다. 무연 납땜용 볼은 외관이 거칠고, 융점과 표면장력의 차이로 인하여 젖음성이 떨어지며, 리플로우 조건에 따라 접합부의 높이에 변화가 있으며, 접합강도는 높아지는 특성을 보였으며 접합부의 신뢰성에서도 유연 납땜용 볼과는 많은 차이를 보였다. 이런 무연 땜납의 특성을 감안하여, 몇 가지 품질특성별 평가방법 및 기준을 제시하였다.

• The Korean Publising Journal, Monthly
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• s.245
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• pp.11-11
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• 1998

북한의 역사연구는 국가적 차원에서 조직됐기 때문에 역사상이 대체로 통일돼 있다. 근현대사 시기구분, 근현대사에 전개된 사건가 주요 인물에 대한 평가 등에서 북한은 반회세 투쟁과 애국주의, '타도 제국주의 동맹' 등을 기점으로 시기구분하며, 주체사상을 강조하려는 의도가 깔려 있다.