• Journal of the Korean Crystal Growth and Crystal Technology
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• v.33 no.2
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• pp.54-60
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• 2023

In this study, microstructure and basic property analysis of DG (Desulfurization gypsum) and CCMs (Carbondioxide conversion capture materials) made by reacting CO₂ with DG were conducted to analyze applicability as a cement admixture. The main crystalline phases of DG were CaO and CaSO₄, and CCMs were CaSO₄, CaCO₃, Ca(OH)₂ and CaSO₄·H₂O. As a result of particle size analysis, the difference in average particle sizes between the two materials was about 7 ㎛. No major heavy metals were detected in the CCMs, and as a result o f TGA, the CO₂ decomposition of CCMs was more than twice as high as that of DG. Therefore, it was judged that CCMs could be used as a cement admixture through optimization of manufacturing conditions. As a results of measuring the strength behavior of DG and CCMs mixture ratios, the long-term strength of CCMs-mixed mortar was higher, and this is due to the filler effect of CaCO₃ in CCMs.

• 월간 한농연
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• s.53
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• pp.32-35
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• 2006

정부는 예산의 효율적인 운용과 합리적인 예산 집행을 위해 비과세 · 감면제도의 개편 방안을 마련 중에 있다. 이에 한국조세연구원에서는 지난 3일 조세중립성 제고를 위한 비과세 · 감면제도 운용방안에 대한 토론회가 있었다. 이번호에서는 정부의 비과세 · 감면제도 개편 방향 및 문제점, 이에 대한 한농연의 요구사항 및 대응활동에 대해 알아보고자 한다.

• Proceedings of the Korean Society of Crop Science Conference
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• 2020.11a
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• pp.110-110
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• 2020

• Journal of Labour Economics
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• v.29 no.1
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• pp.1-39
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• 2006

This paper documents the increase in earnings variability (or earnings risk) during the 1990s in Korea, and investigates whether it can be accounted for by capital market opening. The variances of transitory and permanent innovations in earnings are estimated from repeated cross-section data using a simple econometric framework. The increasing time-series pattern of earnings risk among men follows the increased foreign capital presence reasonably well, but the supporting cross-sectional evidence for a causal relationship between the two is weak. However, foreign direct investment (FDI) is found to have had some non-neutral effects on workers of varying skills in such a way that transitory earnings risk of less-skilled workers relatively increased with FDI. To the extent that transitory innovations are not fully insured, this widening effect of FDI on earnings risk gap may have contributed to widening welfare gap between skilled and unskilled workers in Korea, at least in terms of "risks."

• Culinary science and hospitality research
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• v.21 no.1
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• pp.159-173
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• 2015

This study performed to examine the effects of the characteristics of SNS information, SNS site, and perceived usefulness of information on the visiting intention of SNS user in context of restaurant. Customers use SNS for navigation to find useful information and confirm the information about the destination they would like to visit. To achieve purpose of the current study, we developed a research model based on theoretical backgrounds and conducted a questionnaire survey targeting who is using SNS for searching a useful information. The results were as follow. 1) SNS information reliability, neutrality and amusement had a positive effect on the perceived usefulness of the information. 2) SNS site interaction, usage simplicity and reliability had a positive influence on the perceived usefulness of the information. 3) SNS user's perceived usefulness of the information had a positive effect on the perceived usefulness of the information.

• Journal of the Korean Society of Propulsion Engineers
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• v.25 no.2
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• pp.55-65
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• 2021

In this study, the design criteria is presented for Finocyl grain, which is easy to generate neutral thrust when designing solid rocket motors. For this purpose, an automated program using drafting method was developed for burn-back analysis and its accuracy was validated. Using this developed program, burn-back analysis was performed with various configuration parameters of Finocyl grain, and the tendency and sensitivity analysis on burning characteristics were performed. Based on this analysis, the design criteria were presented to generate the neutral burning surface area trace for a Finocyl grain.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.517-517
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• 2022

세계는 기후 위기, Covid-19에 직면함에 따라 물 산업 분야 탄소감축에 대한 목소리가 높아지고 있다. GWI(Global Water Intelligence)에서는 2030 물 분야 탄소감축 목표를 달성하기 위하여 17억 8,500만 달러, 노후자산 교체를 위한 신규 인프라 건설에 40억5600만 달러의 비용이 들 것으로 추산하였다. 이에 본 연구는 국내 물산업의 탄소중립 목표 달성을 위한 물 기업 혁신 전략 마련에 앞서 '영국 물 산업 2050 혁신 전략' 사례를 고찰하였다. '영국 물 산업 2050 혁신 전략'은 물 산업의 변화를 자극하고 장기적으로 고객과 환경, 그리고 국제사회에 이바지하는 것을 목표하고 있다. 본 전략은 현재와 미래에 제공할 물 서비스에 영향을 미치는 주요 요인과 이해관계자의 요구(Needs)에 집중한다는 특징이 있다. 문제점에 대한 시스템적 관점을 취하면서, 물 부문이 더 넓은 사회적 요인(물, 식량, 에너지 등)에 대해 대응할 수 있는 역할을 제고하기 위함이다. 결과적으로, 산업 인프라 및 환경 관련 다양한 부문 간 협력에 의한 시너지 창출은 온실가스 배출 'Zero'(2050년) 목표 달성에 한발 다가설 것으로 기대되며, 에너지, 제조, 데이터 과학, 식량 안보, 생태 복원 등의 분야는 물 산업 간 연계성이 높아 물 분야 혁신의 기회로 작용할 것으로 예상된다. 본 연구는 물 산업 혁신 전략으로 첫째, 중장기적인 혁신을 제공할 수 있는 통합 혁신 센터를 설치하여 인적·물적 자원을 네트워크화하는 방안을 제시하였다. 둘째, 물 분야 데이터 개방을 통하여 일반, 학계, 중소기업, 스타트업 등과 공동성장 지원을 제시하였다. 셋째, 다양한 물 문제와 경영 의사결정에 환경성을 고려할 것을 제시하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.05a
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• pp.41-42
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• 2021

The Green New Deal policy was established to innovate the government's energy consumption structure, establish a third basic energy plan to strengthen the global competitiveness of the energy industry, and realize a carbon neutral society due to the increased need for transition to a low-carbon economy. Waterworks such as drinking water, water purification plant, and pressurization plant analyze control factors and energy consumption status by process to improve energy management efficiency and reduce energy usage through the 4th industrial revolution. Ultimately, we want to realize net-zero water purification plant.

• Clean Technology
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• v.29 no.2
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• pp.151-159
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• 2023

The realization of carbon neutrality requires cooperation from various stakeholders and the utilization of a governance system. The criteria for participating members are crucial for the successful operation of governance, and it is especially necessary for experts who can provide scientific advice for policy implementation to share a framework for successful consensus. In this study, governance model theory and model structure, governance common success factors by case, and the application of governance cases in the climate and environmental sector of Seoul, were investigated and analyzed to derive common success factors in order to present the activity standards of the science and technology experts participating in governance. The study of the model theory suggested that the model structure is commonly composed of a basic condition-process-result structure, and it was confirmed that common success factors can be derived at the process stage which is the activity period of members. Through the case study of common success factors, overlapping factors were found to be reliability, accountability, transparency, networks, and related factors. The validity of the common success factors was verified using the analysis results of satisfaction survey data from Seoul Governance Committee participants. The results confirmed that reliability was the most valuable factor followed by networks, transparency, and responsibility, and it was found that the related factors were appropriately derived. The findings of this study are expected to be used as an activity factor for science and technology experts to increase the acceptability and effectiveness of carbon-neutral policies in the future.

• Science of Emotion and Sensibility
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• v.24 no.3
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• pp.71-80
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• 2021

Previous studies using facial expressions have revealed valence and arousal as two core dimensions of affective space. However, it remains unknown if the two dimensional structure is consistent across ages. This study investigated affective dimensions using six facial expressions (angry, disgusted, fearful, happy, neutral, and sad) at three ages (young, middle-aged, and old). Several studies previously required participants to directly rate subjective similarity between facial expression pairs. In this study, we collected indirect measures by asking participants to decide if a pair of two stimuli conveyed the same emotions. Multidimensional scaling showed that "angry-disgusted" and "sad-disgusted" pairs are similar at all three ages. In addition, "angry-sad," "angry-neutral," "neutral-sad," and "disgusted-fearful" pairs were similar at old age. When two faces in a pair reflect the same emotion, "sad" was the most inaccurate in old age, suggesting that the ability to recognize "sad" decreases with old age. This study suggested that the general two-core dimension structure is robust across all age groups with the exception of specific emotions.