PURPOSES : The process of extracting and recovering an asphalt binder from an asphalt mixture is harmful to the human body and can affect the properties of the asphalt binder owing to the presence of residual solvent quantities. This study was conducted to determine the properties of aged asphalt binders based on rejuvenator content without extracting and recovering the asphalt binders using RAP mortar. METHODS : After extracting and recovering aged binders from waste asphalt, a rejuvenator was added at a certain rate to evaluate the physical and rheological properties of the binder based on the added amount. RESULTS : When the rejuvenator content was greater than necessary, the absolute viscosity was not properly measured owing to the behavior of the rejuvenator. The phase angle was measured to be almost 90°, thus indicating that it acted as a liquid . In addition, the shear strain and nonrecovery compliance also increased significantly. CONCLUSIONS : If an excess rejuvenator quantity was added to the aged binder, the absolute viscosity was not properly measured, the phase angle was measured to be almost 90°, and the shear strain increased significantly. It is also necessary to conduct the same tests on different types of RAPs to ensure that the results of this study are reasonable.

In the case of a school building, even though it is a regular structure in terms of plan shape, if the masonry infill wall acts as a lateral load resisting element, it can be determined as a torsionally irregular building. As a result, the strength and ductility of the structure are reduced, which may cause additional earthquake damage to the structure. Therefore, in this study, a structure similar to a school building with torsional irregularity was selected as an example structure and the damping performance of the PC-BRB was analyzed by adjusting the eccentricity according to the amount of masonry infilled wall. As a result of nonlinear dynamic analysis after seismic reinforcement, the torsional irregularity of each floor was reduced compared to before reinforcement, and the beams and column members of the collapse level satisfied the performance level due to the reduction of shear force and the reinforcement of stiffness. The energy dissipation of PC-BRB was similar in the REC-10 ~ REC-20 analytical models with an eccentricity of 20% or less. REC-25 with an eccentricity of 25% was the largest, and it is judged that it is effective to combine and apply PC-BRB when it has an eccentricity of 25% or more to control the torsional behavior.

PURPOSES : The purpose of this study was to improve the performance of concrete pavements by measuring the unit-water content with an Internet-of-Things (IoT)-based unit-water content measurement device at an increased precision compared with that of existing measuring equipment. METHODS : We calculated the properties of concrete that varied according to variations in the unit-water content. To confirm the change in the performance of concrete pavements, we compared and analyzed the fatigue cracking rate and international roughness index of concrete pavements at the 20-year point of public use according to the changes in properties using the Korea Pavement Research Program(KPRP). RESULTS : We confirmed that IoT-based measurement equipment can improve the performance of pavements without changing their mixing designs or specifications. We confirmed that the performance of the concrete pavements changed significantly, even with unit-water content variations within the range of quality standards. According to IoT-based unit-water content management, we confirmed that the performance of the concrete pavement (fatigue cracking rate and international roughness index) improved without changing the mixing design. CONCLUSIONS : We confirmed that by using IoT-based unit-water content management, pavement performance can be improved. It is necessary to consider whether the application of this concept to other concrete property management items, such as the chloride content, is possible. Considering the changes in concrete properties according to the unit-water content based on laboratory tests and considerations of various load conditions will be necessary for future research.

PURPOSES : This study predicts the concentration of suspended road dust (PM10) by analyzing meteorological, traffic, and atmospheric environmental data acquired at various angles, and attains a comprehensive understanding of the influencing factors of suspended road dust. METHODS : Experimental field methods were applied and statistical analyses were conducted. Field experiments were conducted using a vehicle-based measurement of suspended dust (PM10) to measure its concentration at the measurement site while maintaining a constant driving vehicular speed. Statistical analysis demonstrated the effects of the concentration of suspended dust on changes in meteorological and environmental factors and lanes per traffic volume at the time of measurement. Finally, a multiple linear regression model was applied to identify the factors which affected the generation of suspended dust. RESULTS : The analysis of suspended road dust concentrations according to the lanes per traffic volume and environmental factors showed that suspended dust concentrations increased at increasing driving speeds. In addition, the background concentration at the monitoring station was higher at high-wind speeds (>3.0 m/s) than at low-wind speeds (<1.6 m/s), but the suspended dust concentrations were higher at low-wind speeds. During the temperature inversion period from evening to morning, the suspended effects of traffic and meteorological factors were greater than the background concentration at the station. Multiple linear regression analysis showed that excluding yellow-dust days, which are known to affect atmospheric pollution levels, the accuracy of the model improved and resulted in increases in background PM10, vapor pressure, sea-level pressure, visibility, after-rainfall time, and in decreases in insolation and precipitation during low-wind speed conditions. CONCLUSIONS : At low-wind speeds, 5 days after rain, and when the relative humidity was higher than 72%, suspended dust was found to be higher than atmospheric PM10 concentration and may increase at increasing driving speeds and section lane traffic volumes. However, the volume of measured data in this study is limited to determining the patterns of suspended dust, as the silt loading of the operational road or the effects of prominent variables were not considered in this study. However, we identified prominent factors related to road-suspended dust for real-time road-dust predictions.

최근 들어 반려동물을 키우는 가구 수가 증가하고 있다. 그로인해 진드기와 냄새에 대한 관심 또한 증가하고 있다. 본 연구는 제충국 추출물 (Tanacetum cinerariifolium), 수용성 피톤치드(water-soluble phytoncide)가 진드기 퇴치제로서 효과와 탈취 및 항균 효과가 있는지 알아보기 위하 여 연구를 진행하였다. 틱 클라이밍 테스트(Tick climbing test)에서 제충국 추출물(Tanacetum cinerariifolium) 23.33점, 수용성 피톤치드 22.00점 으로 높은 기피효과를 보였다. 복합추출물로서의 진드기 기피 효과를 확인하기 위해 위 실험에서 기피 효과가 확인된 제충국 추출물, 수용성 피톤치 드를 포함한 복합추출물(Sample이라 함.), 타사 제품(Control이라 함.)로 틱 클라이밍 테스트(Tick climbing test)를 진행하였다. 결과 Sample 13.00점, Control 26.67점으로 Sample이 높은 기피 효과를 나타내었다. 참진드기 실내 기피제 효력 시험법에서도 Sample이 88%, Control이 12%로 우수한 진드기 기피효과를 보인다는 것을 확인하였다. Sample을 가지고 탈취 시험을 진행한 결과 암모니아에서 98.3%, 트리메틸아민에서 99.5%의 탈취 효과를 보여주었으며, 항균시험에서 대장균, 황색포도상구균, 폐렴균 모두 99.9%의 항균 효과를 보여주었다. 본 연구결과를 종합해 볼 때 위 소재를 포함한 복합추출물은 추후 진드기 기피제와 탈취 및 항균에도 효과가 있는 소재로서의 활용 가치가 높다고 판단된다.

Purpose: This study explored illness experiences and the demands for a health-related program tailored to individuals with chronic disease at one of the Korean Seon Centers. It also utilized this information as foundational data for developing a program tailored to their needs. Methods: The study utilized focus group interviews to collect data from members of one of the Korean Seon centers who have chronic disease, regarding their illness experiences and their expectations for disease management programs. The collected data was then analyzed using the qualitative content analysis method. Results: The analysis yielded five overarching themes and 14 subthemes. These themes included opposing responses to disease diagnosis, reflections on the causes of disease, efforts toward disease recovery, obstacles to disease recovery, and the need for a customized disease management program. Conclusion: The findings highlighted the challenges the participants faced in their disease recovery process. They expressed a strong desire for a comprehensive management program that incorporates in-depth information, experience sharing, and education. Such a program would empower individuals to take control of their physical and mental well-being.

본 연구는 최근 세계 주요국(미국, 중국, 독일, 일본, 대만)의 산업혁신정책의 목표를 3대 분야 6개 세부목표로 분류하여 평가한다. 3대 분야의 첫째는 ‘기존산업과 미래성장’ 이라는 전통적 산업정책 목표인데 이는 다시 ‘기존산업 경쟁력 강화’와 ‘미래 성장산업의 육성’ 이라는 두 세부 목표로 나뉜다. 둘째는 ‘환경과 삶의 질’ 분야인데 이는 ‘국민의 삶의 질 개선’과 ‘환경과 지속가능성’으로 구분된다. 셋째는 ‘공급망과 경제안보’인데, 이는 ‘공급망 안정성 확보’와 ‘경제안보’로 세분된다. 미국은 미·중 패권경쟁 상황 속에서 상대적으로 공급망과 경제안보를 중시하는 반면, 중국은 전통적 산업정책을 추구하여 왔으나 최근 공급망과 경제안보도 고려하기 시작했다. 독일과 일본은 전통적 산업정책과 함께 환경과 삶의 질뿐만 아니라 기술주권 및 공급망 안정도 중시함에 따라 산업정책의 3대 분야를 골고루 중시한다고 볼 수 있다. 대만도 비슷하다고 볼 수 있으나, 최근 중국의 위협에 따라 경제안보를 중시하기 시작했다. 한국의 경우, 경제패권국인 미·중과 달리 ‘경제안보’가 최우선 순위가 아닐 수 있다. 오히려 독일과 같이 국가 간 연대와 협력에 기반한 ‘공급망 안정성’, ‘기술주권’ 확보가 더 적절하여 보인다. 즉, 미국이나 독일 및 일본과의 기술격차를 줄이고 넘어서기 위한 ‘미래 성장산업과 기술의 육성’이 여전히 중요하다. 결론적으로 한국은 3대 분야에 대해서 비슷한 수준으로 가중치를 두어 기존산업과 미래산업을 중시하는 ‘전통적 산업정책’을 지속하면서, 일단 리스크 관리 차원에서 ‘공급망 안정성 확보’에 단기적으로 가중치를 둘 필요가 있다. 한국적 상황에서 안보란 방위산업 육성이나 식량안보가 더 적절하다.

A novel L. harbinensis VF was isolated from fermented vinegar and identified through biochemical characteristics and 16S rRNA sequencing analysis. Characteristics of probiotics were studied for acid and bile salt tolerances, hemolytic activity, antibiotic resistance, antimicrobial activity, cell surface hydrophobicity, and aggregation. The survival rates of the isolate were maintained at 68.9% and 95.6% after 3 h incubation at pH 2.0 and 2.5 and were over 74% at bile salt concentrations of 0.3% and 0.5%. The hemolytic activity was confirmed to be -hemolysis. The isolate showed broad antibiotics-resistance in over 12 antibiotics except for trimethoprim/sulfamethoxazole, compared to L. plantarum (KCTC 3108), used as control, and previously reported L. harbinensis. Antimicrobial activity was confirmed against pathogens, B. cereus, E. coli O157:H7, L. monocytogenes, and S. typhimurium, except S. aureus, and it was attributed to produced organic acids (low pH). The hydrophobicity for xylene and chloroform were 16.7% and 20.4%, respectively, lower than those of L. plantarum (41.2% & 49.9%). The auto-aggregation and coaggregation with pathogens were 83.8% and 49.2-87.6% at 24 h incubation, respectively, higher than those of L. plantarum. From this study, L. harbinensis VF is likely to be used as a probiotic strain and is a strong candidate for commercial application.

This study investigated the hazard factors based on imported food non-compliance and global food hazard information for the last 4 years to suggest imported food safety management. Food safety management on utensils or packaging containers is appropriately managed for the compounds derived from them. Food safety management on health-functional foods, processed foods, and agricultural products is concentrated on ingredient contents, food additives, and pesticide residuals. Additional hazards are illegal compounds, mycotoxins & pesticide residuals, hygieneindicator microorganisms and food-borne pathogens in health-functional foods, processed foods, and agricultural products, respectively. The continuous increase in hazards related to safety and hygiene in global food hazard information needs additional attention. To reduce the hazard factors, this study proposes that imported food be limited to products certified by HACCP or an equivalent food safety management system because registering foreign food facilities for processed and health-functional foods is mandatory. Additionally, the customs clearance inspections should focus on the hazard factors derived from the global food hazard information system. This study suggests a global food hazard information system that could derive frequently issued hazard factors at a given period and newly issued hazard factors in aspects, such as food items, subcategories, and exporting countries.

본 논문은 기업뿐만 아니라 국가 차원의 지속가능성을 개념으로 하는 일본의 ESG 채권에 관한 제도 및 운영사항을 살펴보고 한국 지자체에서 발행하는 ESG 채권 운영과 제도 활성화에 관한 시사점을 얻는 것을 연구목적으로 한다. 향후 지자체에 의한 ESG 채권 발행은 시장 규모가 확대됨에 따라 용도와 계획이 증가될 것으로 예상된다. 이러한 상황에서 ESG 채권 시장의 건전한 발전을 위해서는 환경 및 사회 개선 효과의 신뢰성을 확보하고 발행자의 비용 및 행정 부담을 줄여야 할 것이다. 본 연구는 ESG 투자의 활성화 를 위한 제도 설계와 정책 수립, 기관의 설립, ESG 투자 방법, 임팩트 평가 기법을 확립하고 보급해야 함을 강조한다. 또한 정부와 지자체의 ESG 투자와 관련 이해관계자 간 연결 강화와 커뮤니티 형성 촉진 노력을 제언한다.