Aquatic ecosystem is composed of various organic and inorganic matters. Its health is essential for sustaining its members such as vegetations, mammals, birds, fishes and invertebrates. Samcheonpo stream is one of candidate streams in Sacheon area of ecological restoration. For this reason, this study conducted to build up a data base for future comparison. The results shows that biodiversity of Epilithic Diatoms and Invertebrates is below average which means that human impacts such as artificial structures and activities have been negatively related to stream health. Consequently, we suggest several key factors when ecological restoration is performed in the stream.

PURPOSES : In this study, the basis for improving the maintenance method of road pavement in Jeju Island, where deterioration is accelerating, was presented through field construction and analysis of various combinations of maintenance methods. METHODS : Construction was performed on Jeju Island's Aejo Road, which has high traffic and frequent early damage, using various asphalt mixtures mainly applied in Jeju Island, with different maintenance cross-sections depending on the level of repair. The quality and performance of the asphalt mixture collected during construction were evaluated, and MEPDG was used to analyze the service life according to the type and maintenance level of the mixture. RESULTS : While the mixture for the surface layer satisfied the quality standards and had excellent rutting and moisture resistance performance, the asphalt mixture for the intermediate and base layer did not satisfy the quality standards such as air voids, so it was judged that quality control was necessary during production. The section repaired to the base layer was found to be advantageous for the integrated behavior of the pavement and had the best structural integrity. As a result of predicting the service life, the estimated life of the section where only the surface layer was repaired was analyzed to be approximately 7 years, the section where the intermediate layer was repaired was 14.5 years, and the section where the entire section up to the base layer was repaired was analyzed to be 18 years. CONCLUSIONS : In Jeju Island, where deterioration is accelerating, it was analyzed that when establishing a maintenance plan, it is necessary to consider repairing the middle and base floors in order to secure the designed life of 10 years.

PURPOSES : The purpose of this study is to provide basic data to improve the service life of asphalt pavement using basalt aggregate in Jeju Island by evaluating the performance of asphalt pavement through analysis of material and structural aspects. METHODS : To evaluate the performance of Jeju Island's asphalt pavement, cracks, permanent deformation, and longitudinal roughness were analyzed for the Aejo-ro road, which has high traffic and frequent premature damage. Cores were collected from Aejo-ro sections in good condition and damaged condition, and the physical properties of each layer were compared and analyzed. In addition, plate cores were collected from two sections with severe damage and the cause of pavement damage was analyzed in detail. RESULTS : About 45% of the collected cores suffered damage such as layer separation and damage to the lower layer. The asphalt content of surface layer in the damaged section was found to be 1.1% lower on average than that in the good condition section, and the mix gradations generally satisfied the standards. The density difference between the cores of each layer was found to be quite large, and the air voids was found to be at a high level. CONCLUSIONS : Test results on the cores showed that, considering the high absorption ratio of basalt aggregate, the asphalt content was generally low, and the high air voids of the pavement was believed to have had a significant impact on damage. High air voids in asphalt pavement can be caused by poor mixture itself, poor construction management, or a combination of the two factors. Additionally, the separation of each layer is believed to be the cause of premature failure of asphalt pavement.

이 연구의 목적은 재일동포의 민족정체성 유형의 존재 형태와 차세대 정체성 의 변화, 그리고 이에 대응하기 위한 차세대 정체성 함양 방안 등을 모색하는 데 있다. 연구 결과는 다음과 같다. 지금까지 일본 정부의 재일동포 정책은 재 일동포 차세대에게 보이지 않는 차별과 동화의 시대로 이끌면서 차세대들을 변 화시키고 있다. 연구 결과, 재일동포 차세대 정체성의 함양 방안은 민단이 주최 하는 춘계학교 참여를 통한 정체성 인식 계기, 한국어와 한국문화를 접할 수 있 는 모국연수 기회 부여, 누구나가 방문할 수 있는 열린 포용적 단체 결성을 통 한 교류 기회 제공, 정체성의 위기에 대응하는 상담 전문센터 건립, 재일동포 귀화 증가와 커뮤니티 축소로 인터넷상에서 가상공간 네트워크 구축, 한국 정 부의 재일동포 현 상태 인식과 정책적 지원 등으로 나타났다. 따라서 향후 재일 동포 차세대에게 정체성 인식의 계기와 다양한 기회를 제공하는 것이 그들의 정체성을 함양하는 방안이 될 것으로 생각된다. 결론적으로 재일동포 차세대들 이 국가정체성 측면에서 글로벌 시민으로서의 자유로운 국적 선택이 가능하고 민족정체성 측면에서는 모국의 뿌리를 인식하고 언어와 역사 문화를 공유하는 프로그램이 강구되어야 할 것이다. 그러나 역설적으로 이민의 시대 일본 정부 의 이민정책과 재일동포 정책의 성과는 한국 다문화정책이 향후 어떠한 방향으 로 추진되어야 할지를 시사하고 있는 것으로 생각된다.

FT-IR, GC/MS, and ATR-FT-IR analyses were performed to confirm the physicochemical characteristics of saw palmetto fruit (SPF) extract. FT-IR analysis of the standard product showed that the band corresponding to the carbonyl bond of free fatty acid was stronger than the band of acyl-glyceride. Sample E was identified as having the same trend as the standard sample. Fatty acid composition analysis revealed that the main fatty acids in the standard sample were lauric acid and oleic acid. The content of lauric acid ranged from approximately 30% to 38% in samples B, C, D, and E, while the content of oleic acid ranged from approximately 29% to 34%. The GC/MS analysis confirmed that the standard SPF extract consisted of fatty acids and fatty acid ethyl esters. Sample E demonstrated a similar pattern to the standard samples in terms of oleic acid, lauric acid, and fatty acid esters. ATR-FT-IR analysis indicated that only sample E was predicted to contain 100% saw palmetto extract. Therefore, these study findings can be considered fundamental data for analyzing the physicochemical characteristics of the composition of SPF extract.

This study assessed the measurement technique of odorous substances using a GC/MOS system with MOS sensor at the detector and the method detection limits were determined for odorous substances such as hydrogen sulfide, acetaldehyde, toluene, m,pxylene, and o-xylene. The portable GC/MOS system was able to separate and measure about 16 out of 22 odorous substances including sulfur compounds, aldehydes, and VOCs. The peak values for hydrogen sulfide, acetaldehyde, toluene, m,p-xylene, and o-xylene showed a nonlinear relationship with concentration and a correlation coefficient of 0.95 or higher was confirmed. The method detection limits for hydrogen sulfide, acetaldehyde, toluene, m.pxylene, and o-xylene using the portable GC/MOS system were determined to be 0.005, 0.023, 0.016, 0.004, and 0.051 ppm, respectively. It is expected that the system can measure odor samples with concentrations of least 50 ppb without additional pretreatment or concentration processes.

본 연구의 목적은 5% 녹두(Phaseolus aureus L.)의 급여가 고지혈증 유발 Sprague-Dawley (SD)계 흰쥐의 혈청 blood urea nitrogen(BUN), creatinine 및 요산(uric acid)의 농도와 aspartate aminotransferase(AST), alanine aminotransferase(ALT), alkaline phosphatase(ALP), lactate dehydrogenase(LDH), amylase, lipase 및 catalase 활성에 미치는 영향을 규명하고자 시행하였다. 연구 결과 녹두는 고지혈증으로 유발된 흰쥐의 혈청 BUN, creatinine, 요산 농도 및 AST, ALT, ALP, LDH, amylase, lipase의 활성 감소와 catalase 활성을 증가시키는 것으로 나타났다. 따라서 녹두는 신장과 간 등의 기능 개선과 예방에 효과적일 것으로 판단되어 기능성 소재로서의 이용 가능성이 있을 것으로 기 대된다.

본 논문에서는 등가 단자유도를 이용하여 구조부재의 정적변위를 고려하는 해석기법을 제시하였다. 기존의 단자유도 비선형 동적 해석 알고리듬을 구조부재의 초기정적변위의 영향을 고려할 수 있도록 개선하였다. 가정된 폭발하중 지속시간과 부재의 고유주기 비 에 따라 정적변위가 최대응답에 미치는 영향의 차이와 폭발하중의 방향과 초기변위의 방향에 따른 차이를 확인하였다. 이에 따라 기 존의 응답 차트를 정적변위를 고려할 수 있도록 폭발하중의 형태에 따라 각각 제시하였다. 설계 예제를 정적변위가 고려된 응답 차트 에 적용하여 부재의 최대 변위를 비교 및 분석하였다. 본 연구의 결과를 통해 초기 정적변위를 고려한 구조부재의 최대응답을 쉽게 산 정할 수 있으며 본 연구에서 제시한 응답 차트는 플랜트 또는 군사시설물의 내폭 설계에 활용될 수 있다.