• 천문학회지
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• 제18권2호
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• pp.100-110
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• 1985

The HI features associated with HII regions and radio sources in the galactic-plane are searched in the Maryland-Green Bank Galactic 21-cm Line Survey. Among the twenty-eight such objects, twenty-five show HI depression features, two no feature, and an emission feature with excess HI brightness temperature. Most of these feature are surrounded by strong HI emissions. The depth of the HI depression is proportional to the radio continuum brightness temperature. The angular dimensions of the HI feature and radio source are comparable. The small HI depressions shown at the positions of HII region located in the outer solar circle are considered to be HI self-absorption features of very cold HI gas.

• 대한인간공학회지
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• 제7권2호
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• pp.3-13
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• 1988

For health and welfare of VDT workers in VDT tasks, there has been serious efforts to establish guidelines for VDT tasks in several countries. In this study the author reviewed those guidelines and related researches in relation to health problems of VDT tasks and then suggested some minimal conditions or some key items of VDT task dimensions to protect VDT workers in performing their VDT tasks.

• 연구논문집
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• 통권22호
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• pp.85-96
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• 1992

A mass flow controller(MFC) is commonly used in the semiconductor industries to control the flow rate of various process gases. The measurement and precise control of the of flow rate the gas are the key for a succesful IC fabrication. To eventually design a reliable MFC, a pre-proto type MFC was built and its flow characteristics were investigated. Most of the functional components of the pre-proto type were built for the present study, but the remainder were adopted from a commercial unit. The flow control characteristics were compared with that of a standard MFC. Major dimensions of an MFC for 0-10 SLM capacity were suggested.

• 한국의류학회지
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• 제36권6호
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• pp.601-615
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• 2012

In this study, two representative measures in the job-focused approach and the employee-focused approach of emotional labor are explored to examine dimensionality and the predictability of each emotional labor measure on key consequences that include job stress, customer orientation, and job satisfaction. Data obtained from 193 department store apparel saleswomen were submitted for analysis. The results show that the emotional dissonance and emotional effort of the Kruml and Geddes measure are good predictors for job stress, customer orientation, and job satisfaction. In a test of the Davies measure, job stress is predicted by emotional dissonance and frequency while customer orientation is predicted by duration, variety, and the frequency of emotional expression in jobs. Duration is also a key predictor for job satisfaction. The result confirm the dimensionality and predictability of two emotional labor measures as well as suggests the need for the careful selection and refinement of appropriate measures according to consequences.

• Smart Structures and Systems
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• 제21권2호
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• pp.151-161
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• 2018

A new type of cascade sandwiched piezoelectric ultrasonic transducer is presented and studied. The cascade transducer is composed of two traditional longitudinally sandwiched piezoelectric transducers, which are connected together in series mechanically and in parallel electrically. Based on the analytical method, the electromechanical equivalent circuit of the cascade transducer is derived and the resonance/anti-resonance frequency equations are obtained. The impedance characteristics and the vibrational modes of the transducer are analyzed. By means of numerical method, the dependency of the resonance/anti-resonance frequency and the effective electromechanical coupling coefficient on the geometrical dimensions of the cascade transducer are studied and some interesting conclusions are obtained. Two prototypes of the cascade transducers are designed and made; the resonance/anti-resonance frequency is measured. It is shown that the analytical resonance/anti-resonance frequencies are in good agreement with the experimental results. It is expected that this kind of cascade transducer can be used in large power and high intensity ultrasonic applications, such as ultrasonic liquid processing, ultrasonic metal machining and ultrasonic welding and soldering.

• 문화기술의 융합
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• 제8권5호
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• pp.9-16
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• 2022

본 연구는 Bloom의 신교육목표분류학에 근거하여 2015 특수교육교육과정 중학교 체육과 교육과정 성취기준을 분석하고자 하였다. 이를 위해 해당 교육과정 체육과 중학교 공통교육과정과 기본교육과정 성취기준 문장수 184개를Bloom의 신교육목표분류학 지식 4개차원과 인지과정 6개차원 총 24개 조합으로 분석하였다. 연구결과는 다음과 같다. 첫째, 특수교육교육과정 체육과 중학교 성취기준의 경우 선행연구에서 나타난 초등학교 기본교육과정 분석과 달리 '절차적 지식-적용하다' 조합이 가장 많았으며 학교급별 위계가 있음을 확인하였다. 또한 지식과 인지과정 차원이 비교적 다양하게 나타나 장애학생을 위한 체육과 중학교 수업의 중점사항을 확인할 수 있었다. 둘째, 하위 교육과정중 공통교육과정의 경우 '기억하다'와 같은 인지과정 차원을 제외하고 비교적 다양하게 지식과 인지과정 차원이 나타났으며, '메타인지 지식'과 '창안하다'와 같은 고등 지식 및 인지과정 차원도 나타난 것으로 분석되었다. 셋째, 하위 교육과정 중 기본교육과정의 경우 '절차적 지식-적용하다' 조합이 60.7%로 과도하게 집중되는 현상이 나타나 개선이 필요한 것으로 분석되었다.

• 서비스연구
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• 제13권4호
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• pp.191-205
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• 2023

인공 지능 (AI), 특히 텍스트 생성 서비스 분야에서의 발전은 두드러지게 나타나고 있으며, AI-as-a-Service (AIaaS) 시장은 2028년까지 550억 달러에 달할 것으로 예상된다. 본 연구는 합성 텍스트 미디어 소프트웨어의 품질 요소를 탐구하였으며, 이를 위해 ChatGPT, Writesonic, Jasper, 그리고 Anyword와 같은 산업의 주요 서비스에 주목하였다. 소프트웨어 평가 플랫폼에서 수집된 4,000개 이상의 리뷰를 바탕으로, Gensim 라이브러리를 활용한 잠재 디리클레 할당 (LDA) 주제 모델링 기법을 적용하였다. 이 분석을 통해 11개의 주제가 도출되었다. 이후 이 주제들을 AICSQ 및 AISAQUAL과 같은 기존 논문에서 다루었던 AI 서비스 품질 차원과 비교 분석하였다. 리뷰에서는 가용성 및 효율성과 같은 차원이 주로 강조되었으며, 이전 연구에서 중요하게 여겨졌던 사람다움과 같은 요소는 본 연구에서 강조되지 않았다. 이러한 결과는 AI 서비스의 본질적 특성, 즉 사용자와의 직접적인 상호작용보다 의미론적 이해에 더 중점을 둔다는 특성 때문으로 해석된다. 본 연구는 단일 리뷰 원천 및 평가자들의 인구 통계의 특정성과 같은 잠재적 편향을 인정하며, 향후 연구 방향으로는 이러한 품질 차원이 사용자 만족도에 어떻게 영향을 미치는지, 그리고 개별 차원이 전체 평점에 어떻게 영향을 미치는지에 대한 깊은 분석을 제안한다.

• Smart Structures and Systems
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• 제32권2호
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• pp.101-109
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• 2023

In order to improve the measurement accuracy of the 6-dimensional accelerometer, the cross coupling compensation method of the accelerometer needs to be studied. In this paper, the non-linear error caused by cross coupling of piezoelectric six-dimensional accelerometer is compensated online. The cross coupling filter is obtained by analyzing the cross coupling principle of a piezoelectric six-dimensional accelerometer. Linear and non-linear fitting methods are designed. A two-level calibration hybrid compensation algorithm is proposed. An experimental prototype of a piezoelectric six-dimensional accelerometer is fabricated. Calibration and test experiments of accelerometer were carried out. The measured results show that the average non-linearity of the proposed algorithm is 2.2628% lower than that of the least square method, the solution time is 0.019382 seconds, and the proposed algorithm can realize the real-time measurement in six dimensions while improving the measurement accuracy. The proposed algorithm combines real-time and high precision. The research results provide theoretical and technical support for the calibration method and online compensation technology of the 6-dimensional accelerometer.

• 디지털융복합연구
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• 제6권3호
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• pp.93-107
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• 2008

The aim of this study was to draw some suggestions for Internet Policy by using empirical analyses of key factors in Internet addiction in youths. Internet addiction in youths is perceived as a current and significant issue throughout the world. For the purpose of this study, factors that have influence on the Internet addiction of the youth have been explored and analysed empirically of its hypothetical relationships by using the SEM(structural equation modelling). As a result, a few key factors that suggest a strong relationship to Internet addiction in youths have been drawn: subjects' personality, accessibility to the Internet, psychology and communication factor. Particularly accessibility to the Internet, and specifically the duration of time spent online causes the phenomenon of the Internet addiction. This study shows, however, the subjects' personality and communication factor have the most significant causal relationship to Internet addiction. In other word, the Internet addiction has been changing with the various factors including the factors drawn in this study, which are subjects' personality, accessibility to the Internet, psychology and communication factor. Therefore, Internet addiction should not be merely treated as the isolated problem of the Internet itself; rather it should be understood as various dimensions of society, economy, culture etc. Furthermore, some alternatives to deal with the Internet addiction should be found in various approaches.

• Structural Engineering and Mechanics
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• 제43권4호
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• pp.459-473
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• 2012

Post-tensioned concrete voided slab girders are widely used in highway bridge constructions. To obtain greater section hollow rate and reduce the self-weight, the plate thickness of slab girders are designed to be small with the adoption of flat anchorage system. Since large prestress is applied to the anchor end section, it was found that longitudinal shear cracks are easy to occur along the voided slab girder. The reason is the existence of great shearing effect at the junction area between web and bottom (top) plate in the anchor end section. This paper focuses on the longitudinal anti-cracking problem at the anchor end of post-tensioned concrete voided slab girders. Two possible models for longitudinal anticracking analysis are proposed. Differential element analysis method is adopted to derive the solving formula of the critical cracking state, and then the practical analysis method for longitudinal anti-cracking is established. The influence of some factors on the longitudinal anti-cracking ability is studied. Results show that the section dimensions (thickness of bottom, web and top plate) and prestress eccentricity on web plate are the main factors that influence the anti-cracking ability. Moreover, the proposed method is applied into three engineering examples to make longitudinal anti-cracking verification for the girders. According to the verification results, the design improvements for these girders are determined.