본 연구는 변화하는 도시 및 환경 문제, 기후변화 문제에 대응하기 위한 방법 중 하나인 바람길숲 조성과 관련하여 바람길숲의 실효성을 높이기 위한 제도화 방안 및 부처별 연계 방안을 제안하였다. 이를 위해 바람길 관련 용어를 포함하고 있는 법·제도를 검토하여 관련 계획 내에서 요구되는 바람길의 역할 및 상호관계를 파악하였으며, 바람길숲 관련 상위계획 및 바람길숲 기본계획에 대한 검토를 통해 현재 조성되고 있는 바람길숲의 문제점을 파악하여 바람길숲 관련 주요 쟁점을 도출하였다. 이러한 결과를 바탕으로 바람길숲 활성화를 위한 제도화 방안은 크게 바람길숲 법제화를 위한 제도화 방안과 바람길숲의 실효성 있는 활성화를 위한 제도화 방안으로 나누어 법률 정비 및 보완 사항을 제안하였 다. 먼저 바람길숲 법제화를 위한 제도화 방안으로는 1)용어의 정립 및 법적·제도적 근거 마련, 2)관련 계획과의 위계 정립 및 바람길숲 기본계획의 법적 근거 마련 방안을 제시하였으며, 바람길숲의 실효성 있는 활성화를 위한 제도화 방안으로는 1)지도화 된 공간자료 구축에 대한 법‧제도적 근거 마련 방안, 2)바람길숲 기본계획 수립지침 및 바림길숲 조성‧관리 가이드라인 마련의 필요성과 그 내용적 범위 등에 대해 제안하였다. 본 연구자료는 바람길숲 관련 법·제도 마련을 위한 기초자료로 활용될 수 있을 것으로 기대되며, 바람길숲 기본계획의 제도화 연구에 활용될 수 있을 것으로 판단된다. 또한 체계적인 바람길숲 조성과 관련하여 기초자료로 활용될 수 있기를 기대한다.

해양폐기물 중 하나인 패각의 발생량은 매년 증가하고 있으나, 대부분이 해안 근처에 야적되거나 방치되어 환경적·사회적으로 문 제가 되고 있다. 천연 골재 부존량 감소에 따른 골재 대체재로서 패각이 사용된다면 재료 수송에 따른 물류비용을 효과적으로 감축시 킬 수 있어 자원 재활용을 활성화할 수 있다. 본 연구에서는 3D 콘크리트 프린팅 기술을 활용한 해양 구조물의 건설 재료로서 패각 잔 골재의 사용 가능성을 분석하였다. 패각을 활용한 3D 프린팅 콘크리트는 패각 잔골재와 시멘트 풀 계면 등의 공극 요인으로 일반 콘 크리트 대비 낮은 강도를 가지기 때문에 역학적 성능 평가를 위한 미세구조 특성 분석이 요구된다. 유동성, 출력성 및 적층성을 고려하 여 3D 프린팅 콘크리트의 배합을 선정하였으며, 패각 잔골재를 활용한 3D 프린팅 콘크리트 시편의 물성과 미세구조를 분석하였다. 시편의 물성을 평가하기 위해 3D 프린터로 압축강도와 부착강도 시편을 제작하였고 강도 시험을 진행하였다. 미세구조를 분석하기 위해 고해상도 이미지를 얻을 수 있는 SEM 촬영을 수행하였으며, 히스토그램 기반 상 분리 방법을 적용하여 공극을 분리하였다. 패각 잔골재 종류에 따른 공극률을 확인하고 확률함수를 활용하여 공극 분포 특성을 정량화하였으며, 패각 잔골재의 종류에 따른 시편의 역학적 물성과 미세구조 특성 간의 상관관계를 확인하였다.

KEPCO KPS is the contractor for the full system decontamination (FSD) of Kori Unit 1 and under preparation such as modification, lay out for equipment installation, setting up tie-in/out point for chemical injection and way to pressurize the system, of its successful performance. In this research, KPS introduced how KPS has designed and prepared for the FSD project and how will the chemical decontamination process be implemented. As described in the previous research, chemical decontamination process is planned to be conducted for three cycles and each cycle is consisted of oxidation, reduction, decomposition, and purification. Oxidation and reduction process were conducted at 90°C. Chemical decomposition and purification process were conducted at 40°C due to the damage of IX by the heat. If the decontamination result does not meet the target DF and the dose rate, additional cycle can be conducted. Expected volume of process water for FSD is 200 m3. Three systems have been designated as decontamination targets: reactor coolant system (RCS), residual heat removal system (RHRS), chemical volume control system (CVCS). For the steady flow rate, existed plant equipment such as reactor coolant pump (RCP) will be operated and modifications on some components will be conducted. Due to the limited space for installation, decontamination equipment and other resources are distributed to three different places. KPS designed the layout of equipment installed inside the containment vessel. The layout contains the information of shielding for highly radiated equipment such as IX and filter skid.

In this research, KPS manufactured Full System Decontamination (FSD) equipment, which is consisted of Oxidizing Agent Manufacturing System (OAMS), Chemical Injection System (CIS), RadWaste Treatment System (RWTS), Chemical Waste Decomposition & Treatment System (CWDS) and conducted demonstration test to prepare Decontamination and Decommissioning (D&D) project of Kori nuclear power plant in Korea. Each equipment of FSD was modularized due to the limited size of equipment hatch of Kori nuclear power plant. To simulate the expected circumstances in nuclear power plant such as usage of heater or position of each equipment, additional equipment was used. The chemical concentration and flow rate of process water for FSD were used as mentioned in the previous study by KHNP CRI. FSD was conducted for three cycles and each cycle was consisted of oxidation, reduction, chemical decomposition and purification. Oxidation and reduction process were conducted at 90°C. Chemical decomposition and purification process were conducted at 40°C due to the damage of UV lamp and IX by the heat. Total volume of process water for FSD demonstration test was 2.5 m2. KPS conducted decontamination performance review by calculating thickness reduction and weight loss of installed specimen. Operational review was conducted as if FSD test was conducted in the field based on the result of demonstration test. One of the most prioritized features is the workers’ safety. Also, the appropriate position of equipment needs to be considered to meet the required specification of component.

In the pilot scale test, the two scale-up factors (Electric energy per order EEO, Electric energy per mass EEM) were conducted to design the Chemical Waste Decomposition & Treatment System (CWDS). The CWDS consist of two kind UV lamp reactors to improve the decomposition rate of oxalic acid, which are low pressure amalgam UV lamp and medium pressure UV lamp. The two reactors were connected in series, and the hydrogen peroxide is mixed through a line mixer at the front of the reactor and injected into the reactors. The CWDS was connected with the full system decontamination equipment to purify the residual oxalic acid after chemical decontamination process. The full system decontamination equipment were included Oxidizing Agent Manufacturing System (OAMS), Chemical Injection System (CIS), RadWaste Treatment System (RWTS) to operate the Oxidation/Reduction decontamination process and purify the process water. After decontamination process, the waste water will be cooled down into the 40°C and passed through the UV reactor at 110 gpm with hydrogen peroxide injection. The concentration of waste water is expected oxalic acid 1,700 ~ 2,000 ppm, Iron 5 ~ 20 ppm. As a result of the CBD test in the laboratory with simulated waste liquid, the amount of Low pressure amalgam lamp UV dose required to decompose 95% of oxalic acid in 2 m2 waste water was up to 1,800 mJ/cm2. The amount of medium pressure lamp UV dose was up to 450 mJ/cm2 at the same condition. We conducted demonstration test using 2 m2 waste water after the oxidation/reduction decontamination process, the decomposition rate 95% was obtained by low pressure amalgam UV lamp and medium pressure UV lamp reactor each.

This study investigates passenger-authored online reviews of airline services using social network analysis to compare the differences in customer perceptions between full service carriers (FSCs) and low cost carriers (LCCs). While deriving words with high frequency and weight matrix based on the text analysis for FSCs and LCCs respectively, we analyze the semantic network (betweenness centrality, eigenvector centrality, degree centrality) to compare the degree of connection between words in online reviews of each airline types using the social network analysis. Then we compare the words with high frequency and the connection degree to gauge their influences in the network. Moreover, we group eight clusters for FSCs and LCCs using the convergence of iterated correlations (CONCOR) analysis. Using the resultant clusters, we match the clusters to dimensions of two types of service quality models (Grönroos, Brady & Cronin (B&C)) to compare the airline service quality and determine which model fits better. From the semantic network analysis, FSCs are mainly related to inflight service words and LCCs are primarily related to the ground service words. The CONCOR analysis reveals that FSCs are mainly related to the dimension of outcome quality in Grönroos model, but evenly distributed to the dimensions in B&C model. On the other hand, LCCs are primarily related to the dimensions of process quality in both Grönroos and B&C models. From the CONCOR analysis, we also observe that B&C model fits better than Grönroos model for the airline service because the former model can capture passenger perceptions more specifically than the latter model can.