• 한국터널지하공간학회 논문집
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• 제24권2호
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• pp.153-170
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• 2022

워터젯은 콘크리트와 암석 절삭에 적합하며 소음과 진동이 적어 도심지 시공에 널리 활용되는 기술이다. 최근 한국원자력연구원은 처분터널 내 공학적방벽의 열-수리-역학적 복합거동 현장시험의 콘크리트 플러그를 교란 및 손상 없이 해체하기 위해 연마재 워터젯 기술을 채택 및 적용하였다. 본 연구에서는 플러그 해체를 통한 연마재 워터젯의 터널 내 적용성을 평가하였고, 절삭 결과를 개발된 절삭 모델 결과와 비교하였다. 현장 적용성에 관해서는, 워터젯 활용은 경로선택이 용이하였으며 주변부의 추가적인 교란을 발생시키지 않았다. 펌프의 소음은 공회전 시 64.9 dB로 국내 생활소음·진동의 규제기준을 만족하였으나 공중 분사 및 절삭 시에는 터널 내에서 측정되어 그 기준을 상회한 것으로 나타났다. 절삭 모델 검증을 위해 연마재 워터젯의 반복 절삭, 유량, 연마재 투입량 및 이격거리를 주요 변수로 선정하였고 절삭 모델로 계산된 절삭 부피와 측정된 부피의 오차는 1회 절삭 시 12~13%, 2회 절삭 시 16%를 보였다. 절삭 깊이와 폭은 이격거리에 큰 영향을 받았으며, 이격거리가 작을수록 오차가 감소하는 경향을 보였다.

• Animal Bioscience
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• 제37권6호
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• pp.1001-1006
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• 2024

Objective: This study aimed to investigate the effect of Codonopsis pilosula polysaccharide (CPP) on the motility, mitochondrial integrity, acrosome integrity rate, and antioxidant ability of sheep sperm after preservation at 4℃. Methods: Semen from healthy adult rams were collected and divided into four groups with separate addition of 0, 200, 400, and 1,000 mg/L CPP. Sperm motility was analyzed using the Computer-Assisted Semen Analysis software after preservation at 4℃ for 24, 72, 120, and 168 h. Sperm acrosome integrity rate was analyzed by Giemsa staining at 24, 72, and 120 h, and mitochondrial membrane integrity was analyzed by Mito-Tracker Red CMXRos. The total antioxidant capacity (T-AOC) and malondialdehyde (MDA) content of spermatozoa were measured after 120 h of preservation. Results: The sperm viability and forward-moving sperm under 200 mg/L CPP were significantly higher than that in the control group at 72 h (61.28%±3.89% vs 52.83%±0.70%, 51.53%±4.06% vs 42.84%±1.14%), and 168 h (47.21%±0.85% vs 41.43%±0.37%, 38.68%±0.87% vs 31.68%±0.89%). The percentage of fast-moving sperm (15.03%±1.10% vs 11.39%±1.03%) and slow-moving sperm (23.63%±0.76% vs 20.29%±1.11%) in the 200 mg/L group was significantly higher than control group at 168 h. The mitochondrial membrane integrity of the sperm in the group with 200 mg/L CPP was significantly higher than those in the control group after storage at 4℃ for 120 h (74.76%±2.54% vs 65.67%±4.51%, p<0.05). The acrosome integrity rate in the group with 200 mg/L (87.66%±1.26%) and 400 mg/L (84.00%±2.95%) was significantly higher than those in the control group (80.65%±0.16%) after storage for 24 h (p<0.05). CPP also increased T-AOC and decreased the MDA concentration after preservation at 4℃ (p<0.05). Conclusion: Adding CPP could improve the T-AOC of sperm, inhibit lipid peroxidation, and facilitate semen preservation.

• 한국인터넷방송통신학회논문지
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• 제24권1호
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• pp.125-132
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• 2024

본 연구의 목적은 지역 특성에 맞는 드론 활용 모델 발굴 및 드론 활성화를 위한 수요조사 기반으로 드론 실증도시 구축 방향 제시 및 드론 활용 지원체계에 대한 활용방안을 제안하고자 하였다. 첫째, 설문자의 결과에 따르면, 드론 실증사업에 대한 이해도와 도입 필요성도 높고 특히 도시문제 해결에 많은 영향력을 주는 것으로 평가되었다. 둘쨰, 우선 순위와 장단기적 접근 분석 결과를 보면, 우선순위는 재난 관련 업무이고 중장기적 전략을 통한 접근이 필요한 것으로 평가되었다. 셋째, 사업 진행시 예산이 가장 중요한 이슈로 등장 햇다는 것이다. 실무자와 전문가들은 드론 기반 기술들이 예산과 기술이 준비 되었을때는 업무에 적극적으로 도입할 수 있다는 의사를 보유하고 있었다. 현재 적용이 제대로 이루어지지 않는 부분에 대해서는 예산 부족 문제가 가장 크게 지적되었으며, 이 부분이 해결되는 것이 필요하다고도 조사되었다. 넷째, 일부 영역에서 사업 발굴시 수요조사의 필요성이 조사되었다. 실증을 위한 수요조사는 반드시 필요하며, 공공에서 주도할 필요성이 조사되었다. 드론 기반 실증도시 구축에 있어서 대부분의 응답자가 수요조사가 필요하다고 답하였으며, 공공에서 주도하는 것도 필요하다고 조사되었다. 다섯째, 분야별 접근 방식에 대해서는 안전 재해관리 영역이 가장 적용이 필요한 부분으로 제시되었다.

• 한국소음진동공학회논문집
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• 제25권1호
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• pp.48-57
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• 2015

제 4세대 원자로로 개발되고 있는 소듐냉각고속로는 냉각재로 사용되는 소듐의 물과 공기에 의한 반응을 방지하기 위하여 원자로 헤드의 개방 없이 회전 구동만을 이용하여 핵연료 교환을 수행한다. 따라서 핵연료 교환을 위해서는 노심과 상부내부구조물 사이의 공간에 원자로 헤드의 회전 구동을 방해하는 장애물의 존재 여부를 확인하는 검사가 반드시 선행되어야 하는데, 소듐의 불투명성으로 인해 통상적인 광학 장비를 사용한 검사방법으로는 장애물의 확인이 어렵고, 초음파를 이용한 검사방법이 적용되어야 한다. 이 연구에서는 불투명한 소듐 중에서 노심과 상부내부구조물 사이의 장애물 존재 여부를 확인하기 위하여 판형 웨이브가이드 초음파 센서를 적용한 원격주사 검사기법을 개발하였다. 웨이브가이드 센서는 원자로헤드 상부의 저온 구간에 초음파 트랜스듀서를 설치하고 길이가 긴 웨이브가이드를 사용하여 노심 상부의 고온 고방사능 소듐 내부로 초음파를 전파시키기 때문에, 고온 고방사능에 의한 손상 없이 장시간 적용이 가능한 장점을 가지고 있다. 먼저, 수평 방향으로 초음파를 방사시킬 수 있는 10 m 길이의 수평 빔 웨이브가이드 센서를 설계 제작하였고, 제작된 센서의 특성 분석을 위한 빔 프로파일 측정 및 기초 실험을 수행하여 방사되는 초음파의 빔 폭과 전파 거리를 평가하였다. 또한, 실제 장애물로 작용할 수 있는 부품들의 형상인 원형 목표물에 대한 원격탐지 성능시험을 수행하여 개발된 원격주사 기술의 유용성을 평가하였다.

• Asian-Australasian Journal of Animal Sciences
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• 제33권3호
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• pp.480-489
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• 2020

Objective: Sow milk (SM) may not be able to meet the piglet's nutritional needs in late lactation. Hence, this study was conducted to investigate the effects of early commercial milk (CM) supplement on the mucosal morphology, bacterial community and bacterial metabolites in jejunum of piglets. Methods: Ten litters of newborn piglets ([Yorkshire×Landrace]×Duroc) were randomly divided into 2 groups of 5 litters. The piglets in the control group were suckled by the sow (SM), while the piglets in the treatment group (CM supplement) were supplemented with a CM supplement along with suckling from d 4 to d 28 of age. Results: No significant differences were observed about jejunal mucosal morphology on d 28 and d 35 between two groups. On d 28, the activity of lactase in the jejunum was significantly decreased in the CM group, while the activity of sucrase and the ratio of maltase to lactase were significantly increased (p<0.05). On d 35, the activity of maltase in the jejunum was significantly increased in the CM group (p<0.05), and maltase to lactase ratio tended to increase in the CM group (p = 0.065). In addition, piglets in the CM group had a higher abundance of Clostridium XI, Tuicibater, and Moraxella in the jejunum on d 28, while the abundance of Lactobacillus was significantly increased on d 35 (p<0.05). Conclusion: The early CM supplement improved the maturation of the jejunum to some extent by enhancing the maltase and sucrase activities. Moreover, the early CM supplement could help maintain the homeostasis of internal environment in jejunum by increasing the microbial-derived metabolites.

• Asian-Australasian Journal of Animal Sciences
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• 제33권12호
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• pp.2008-2020
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• 2020

Objective: This study was conducted to investigate the effects of dietary corn resistant starch (RS) on the intestinal morphology and barrier functions of broilers. Methods: A total of 320 one-day-old broilers were randomly allocated to 5 dietary treatments: one normal corn-soybean (NC) diet, one corn-soybean-based diet supplementation with 20% corn starch (CS), and 3 corn-soybean-based diets supplementation with 4%, 8%, and 12% corn resistant starch (RS) (identified as 4% RS, 8% RS, and 12% RS, respectively). Each group had eight replicates with eight broilers per replicate. After 21 days feeding, one bird with a body weight (BW) close to the average BW of their replicate was selected and slaughtered. The samples of duodenum, jejunum, ileum, caecum digesta, and blood were collected. Results: Birds fed 4% RS, 8% RS and 12% RS diets showed lower feed intake, BW gain, jejunal villus height (VH), duodenal crypt depth (CD), jejunal VH/CD ratio, duodenal goblet cell density as well as mucin1 mRNA expressions compared to the NC group, but showed higher concentrations of cecal acetic acid and butyric acid, percentage of jejunal proliferating cell nuclear antigen-positive cells and delta like canonical Notch ligand 4 (Dll4), and hes family bHLH transcription factor 1 mRNA expressions. However, there were no differences on the plasma diamine oxidase activity and D-lactic acid concentration among all groups. Conclusion: These findings suggested that RS could suppress intestinal morphology and barrier functions by activating Notch pathway and inhibiting the development of goblet cells, resulting in decreased mucins and tight junction mRNA expression.

• 기본간호학회지
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• 제18권2호
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• pp.237-246
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• 2011

Purpose: Family-caregivers of stroke patients usually go through hardship and life style changes during the protracted course of a family member's rehabilitation. There is need for programs to educate family-caregivers to better manage the medical crisis. In this study an evaluation was done of the degrees of burden and well-being experienced by primary family-caregivers following video-guided education (VGE) on rehabilitation and family lifestyle changes. Method: Fifty-eight primary family-caregivers of stroke patients on a neurological ward were divided into VGE (29) and control (29) groups. VGE was started within 7 days of patient admission. Interventions included VGE, counseling, and demonstration - re-demonstration. The control group received standard education but not VGE. Data were analyzed using Chi-square test, t-test, ANCOVA, and Pearson correlation coefficients with the SAS program. Results: The VGE group had a significantly lower score for total burden (F=7.19, p=.010) and for sub-scale of time-dependent burden (F=8.44, p=.005) than the control group. There was a negative correlation between primary family-caregiver burden and well-being (r=-.7151, p<.001). Conclusion: Results suggest that the rehabilitation program using VGE was an effective nursing intervention to reduce the burden of primary family-caregivers of stroke patients.

• 전기학회논문지P
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• 제66권4호
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• pp.151-157
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• 2017

In this paper, it is the result of analysis of the stability by power system analysis about the influence on the power system when the southwest - offshore wind power demonstration complex is constructed to 60MW and it is linked with the onshore power system. Considering the position of the wind turbine actually installed and the length of the cooperating line, we modeled the wind generators, offshore substation and the turbine step-up transformer. Changes of voltage when internal and external faults occurred is analyzed and the reactive power demand according to the amount of electricity generation is derived. And also phase angle stability and frequency is observed through a transient analysis. This paper clarify that there is no problem in the system when only offshore wind power is linked with the grid and try to present the reactive power amount necessary for maintaining the voltage of the point of cooperation appropriately.

• 대한한의정보학회지
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• 제19권1호
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• pp.44-142
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• 2013

The main purpose of this thesis is the Korean version of Gwang On Yeok Ron(廣瘟疫論). Gwang On Yeok Ron is a specialized book about infectious diseases(瘟疫). The book was compiled by Dae Cheon jang(戴天章) in 1722 who was a medical man in the Qing dynasty. The book consists of four volumes and an appendix. "Gwang On Yeok Ron Vol. I(廣瘟疫論卷之一)" is for the demonstration of colds(傷寒) and infectious diseases through a patient's odor(氣), skin tone(色), tongue(舌), mental state(神) and pulse(脈). Also, it describes the complications(兼證, 夾證) of infectious diseases. "Gwang On Yeok Ron Vol. II(廣瘟疫論卷之二)" describes the external symptoms(表證) of infectious diseases and the remedies. "Gwang On Yeok Ron Vol. III(廣瘟疫論卷之三)" describes the internal symptoms(裏證) of infectious diseases and the remedies. "Gwang On Yeok Ron Vol. IV(廣瘟疫論卷之四)" presents principles for the remedy of infectious diseases, and describes the sequelae(遺證) after the recovery of infectious diseases. "Appendix of Gwang On Yeok Ron(廣瘟疫論方目)" presents 83 prescriptions for the remedy of infectious diseases.

• 한국유기농업학회지
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• 제26권2호
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• pp.173-180
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• 2018

This study was conducted to investigate farmers' satisfaction in organic farming technologies developed by the Rural Development Administration (RDA). The survey targeted farmers who were eco-friendly or interested in eco-friendly agriculture. 70% of the target farmers were doing eco-friendly farming, and the satisfaction rate of the technology developed by the RDA was 3.85 points. The satisfaction of the farmers who participated in demonstration and demonstration of the farming field of the developed technology was 4.00 and the satisfaction level of organic farming instruction manual was 3.95. In addition, 38.4% of the surveyed areas were found to be pest control areas, and the impacts on the satisfaction of the organic cultivation related technology utilization and the satisfaction of the organic cultivation guide were analyzed. As a result, the RDA needs to develop and supply customized technology for aged small farmers.