• Computers and Concrete
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• 제22권4호
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• pp.355-363
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• 2018

In the following paper, a socio-political heuristic search approach, named the imperialist competitive algorithm (ICA) has been used to improve the efficiency of the multi-layer perceptron artificial neural network (ANN) for predicting the compressive strength of concrete. 173 concrete samples have been investigated. For this purpose the values of slump flow, the weight of aggregate and cement, the maximum size of aggregate and the water-cement ratio have been used as the inputs. The compressive strength of concrete has been used as the output in the hybrid ICA-ANN model. Results have been compared with the multiple-linear regression model (MLR), the genetic algorithm (GA) and particle swarm optimization (PSO). The results indicate the superiority and high accuracy of the hybrid ICA-ANN model in predicting the compressive strength of concrete when compared to the other methods.

• Steel and Composite Structures
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• 제29권3호
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• pp.349-362
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• 2018

Thermal buckling behavior of porous functionally graded nanobeam integrated with piezoelectric sensor and actuator based on the nonlocal higher-order shear deformation beam theory is investigated for the first time. Its material properties are assumed to be temperature-dependent and varying along the thickness direction according to the modified power-law rule. Note that the porosity with even type is considered herein. The equations of motion are obtained through Hamilton's principle. The influences of several parameters (such as type of temperature distribution, external electric voltage, material composition, porosity, small-scale effect, Ker foundation parameters, and beam thickness) on the thermal buckling of FG nanobeam are investigated in detail.

• Journal of Preventive Medicine and Public Health
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• 제44권1호
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• pp.14-21
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• 2011

Objectives: The regulatory changes in Korea during the national economic crisis 10 years ago and in the current global recession were analyzed to understand the characteristics of deregulation in labor policies. Methods: Data for this study were derived from the Korean government's official database for administrative regulations and a government document reporting deregulation. Results: A great deal of business-friendly deregulation took place during both economic crises. Occupational health and safety were the main targets of deregulation in both periods, and the regulation of employment promotion and vocational training was preserved relatively intact. The sector having to do with working conditions and the on-site welfare of workers was also deregulated greatly during the former economic crisis, but not in the current global recession. Conclusions: Among the three main areas of labor policy, occupational health and safety was most vulnerable to the deregulation in economic crisis of Korea. A probable reason for this is that the impact of deregulation on the health and safety of workers would not be immediately disclosed after the policy change.

• 한국인쇄학회지
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• 제22권2호
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• pp.83-100
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• 2004

In this paper, the quantity of dot gain in off-set printing is estimated by using the method of UCR(under color removal) and GCR(gray component replacement) and the degree of dot gain is researched through measurement of dot coverage of each color patch at the output film that is variously applied to discretionary quantity of dot gain each line in screen in the printing for the process of color separation and at the offset printing. Also, the best appropriate quantity of dot gain treatment is examined by printing each line in screen for reproduction of colors.

• 한국산업보건학회지
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• 제9권2호
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• pp.32-51
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• 1999

The purposes of this study were to review current status and problems of national qualification sys tem in the field of industrial hygiene, focusing on the deficiencies in the regulatory system and the quality of individual professionals including the Industrial Hygiene Management Professional Engineer and the Industrial Hygiene Management Engineer, and to suggest new directions for the industrial hygiene qualification system. In addition, comparable systems adopted in other countires were reviewed.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권5호
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• pp.2590-2606
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• 2017

Generally, research of classical image classification algorithms assume that training data and testing data are derived from the same domain with the same distribution. Unfortunately, in practical applications, this assumption is rarely met. Aiming at the problem, a domain adaption image classification approach based on multi-sparse representation is proposed in this paper. The existences of intermediate domains are hypothesized between the source and target domains. And each intermediate subspace is modeled through online dictionary learning with target data updating. On the one hand, the reconstruction error of the target data is guaranteed, on the other, the transition from the source domain to the target domain is as smooth as possible. An augmented feature representation produced by invariant sparse codes across the source, intermediate and target domain dictionaries is employed for across domain recognition. Experimental results verify the effectiveness of the proposed algorithm.

• 의학교육논단
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• 제15권2호
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• pp.61-68
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• 2013

During the Japanese colonial period in the Korean Peninsula, Chosun (ethnic Korean) physicians were trained in vocational clinical schools, but Japanese physicians in medical school. Therefore, the Japanese government treated the Japanese physicians as medical doctors but Chosun physicians as dealers or traders in clinical services. This colonial discriminatory policy became a habitual concept to Korean physicians. Because of these traditional concepts regarding physicians, after the colonial period, the newly established Korean government also had the same concept of physicians. Therefore, in 1952, the Korean graduate medical education system was launched under a government clearance system with the claim of supporting medical specialties as clinical dealers or clinical businesspeople. During the last 60 years, this inappropriate customary concept and the unsuitable system have evolved into medical residency training education, and then into graduate medical education. Today graduate medical education has become inextricably linked to postdoctoral work in Korean hospitals.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 추계학술대회 논문집 학회본부
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• pp.273-275
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• 1996

In order to investigate the electrical properties of naphthanic transformer oils for insulating and cooling, the characteristics for breakdown in temperature range of $20{\sim}100[^{\circ}C]$, that of AC breakdown in 1.0[mm] of gap length were made researches. As a result the characteristics for AC breakdown, it is confirm that the dielectric strength was increased to 6[ppm], 9[ppm] but decreased to 3[ppm].

• Journal of Information Processing Systems
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• 제19권4호
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• pp.465-473
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• 2023

An image enhancement algorithm and image defogging method are studied in this paper. The formation of fog and the characteristics of fog image are analyzed, and the fog image is preprocessed by histogram equalization method; then the additive white noise is removed by foggy image attenuation model, the atmospheric scattering physical model is constructed, the image detail characteristics are enhanced by image enhancement method, and the visual effect of defogging image is enhanced by guided filtering method. The proposed method has a good defogging effect on the image. When the number of training iterations is 3,000, the peak signal-to-noise ratio of the proposed method is 43.29 dB and the image structure similarity is 0.9616, indicating excellent image defogging effect.

• 한국자연치유학회지
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• 제8권1호
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• pp.11-20
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• 2019

목적: 본 연구의 목적은 고등학교 학생 568명을 대상으로 학교 진로교육 상담 후에 '진로결정에 미치는 영향', '학교 진로교육 참여현황', '학교 진로교육 만족도'와 '진로교육에 대한 진로결정 자기효능감'을 조사하는 것이었다. 방법: 대상자에게 진로교육 상담 후에 설문지로 조사를 하였다. 결과: 학교 진로교육 상담 후에 대상자에 대한 설문내용 중 '진로결정 정보사항'에서는 '결정했으나 고려중이다'가 49.3%로 높게 나타났다. '자신의 진로'를 선택할 때 가장 도움이 된 것은 '부모님의 조언'이 28.0%, '학교에서 진행되는 진로교육이 진로결정의 효과'는 52.2%로 높게 나타났다. '학교 진로교육활동 참여'에는 13개 항목이 있으며, '학교 진로교육 참여현황'에서는 '창의적 체험활동'(94.7%) 및 '진로와 직업'(94%)이 높았고, '기업가 정신 및 창업 체험'(10.6%)이 가장 낮았다. 진로교육 활동에 대한 만족도 평균치는 3.49점이었다. 가장 높은 항목은 '대학 혹은 전공체험'이 3.66점이었고, '교과 연계 진로교육'은 3.27점으로 가장 낮게 나타났다. 결론: 고등학교 학생들의 진로선택에 영향을 미치는 것은 '부모의 조언'과 '학교에서 진행되는 진로교육'이 진로결정에 효과가 있었다. 진로교육 활동 중 '대학 혹은 전공체험', '진로캠프', '진로 및 직업체험' 등과 같은 진로체험형의 교육이 학생들에게 교육 만족도가 높았다. 진로교육에 대한 만족도가 높은 집단이 진로결정 자기효능감도 높게 나타났다.