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        검색결과 571

        1.
        2024.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        본 연구는 유통 주류의 당류 함량 및 저칼로리 감미료 의 사용 실태를 조사하고자 탁주 10건, 약주 6건, 청주 5 건, 맥주 5건, 과실주 12건, 소주 5건, 일반증류주 5건, 리 큐르 9건, 기타주류 15건을 수거하여 총 72건을 검사하였 다. 당류와 알룰로스는 HPLC-RI로 분석하였고 감미료 5 종은 HPLC-UV와 LC-MSMS를 이용하였다. 전체 주류의 당류 평균함량은 4.13±5.16 g/100 g 이었으며, 유형별로는 발효주(탁주, 약주, 청주, 맥주, 과실주) 0.00-8.92 g/100 g, 증류주(소주, 일반증류주, 리큐르) 0.00-30.55 g/100 g, 기타 주류는 0.14-17.02 g/100 g의 분포를 보였다. 당류의 함량이 가장 높은 유형은 리큐르로 평균 검출 농도가 100 g 당 12.41±9.66 g였다. 저칼로리 감미료의 함량은 아세설팜칼륨 28.6-121.5 mg/kg, 사카린나트륨 42.3 mg/kg, 아스파탐 34.1- 141.5 mg/kg, 수크랄로스 23.3-88.1 mg/kg로 나타났으며 사이 클라메이트와 알룰로스는 모든 주류에서 검출되지 않았다. 72건의 주류 중 24건에서 감미료가 검출되었으며, 검출된 감미료 사용량은 모두 식품첨가물 기준 이내였다.
        4,000원
        2.
        2024.05 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Recently, domestic fishing production of Japanese horse mackerel has been continuously decreasing. To achieve sustainable fishing of this species, it is essential to acquire its target strength (TS) for accurate biomass estimation and to study its ecological characteristics. To date, there has been no TS research using a broadband echosounder targeting Japanese horse mackerel. In this study, for the first time, we synchronized an underwater camera with a broadband frequency (nominal center frequency of 200 kHz, range: 160-260 kHz) to measure the TS according to the body size (16.8-35.5 cm) and swimming angle of the species. The relationship between Japanese horse mackerel length and body weight showed a general tendency for body weight to increase as length increased. The pattern of the frequency spectra (average values) by body length exhibited a similar trend regardless of body length, with no significant fluctuations in frequency observed. The lowest TS value was observed at 243 kHz while the highest TS values were recorded at 180 and 257.5 kHz. The frequency spectra for the swimming angles appeared to be flat at angles of –5, 0, 30, 60, 75, and 80° while detecting more general trends of frequency spectra for swimming angle proved challenging. The results of this study can serve as fundamental data for Japanese horse mackerel biomass estimation and ecological research.
        4,000원
        8.
        2024.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        This study was conducted to verify the reliability of volatile organic compounds (VOCs) data derived from Selected Ion Flow Tube-Mass Spectrometers (SIFT-MS) measurements. In the previous study, the measurement reliability was validated using simultaneous measurements by SIFT-MS and gas chromatography-mass spectrometry (GS-MS), but in order to ensure more accuracy, and additional analysis was conducted by diluting standard gases (2 ppm) consisting of 10 types of VOCs mainly measured in industrial complexes (concentrations ranged from 0 to 500 ppb). As a result of 2 experiments, the SIFT-MS showed linearity and produced a coefficient of determination of over 0.99 for all cases. SIFT-MS has secured high measurement reliability, and it is considered to be able to efficiently manage VOCs emitted in industrial complexes.
        4,000원
        11.
        2023.10 KCI 등재 구독 인증기관 무료, 개인회원 유료
        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.
        6,100원
        12.
        2023.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Benthic attached diatoms (BADs), a major primary producer in lotic stream and river ecosystems are micro-sized organisms and require a highly magnified microscopic technique in the observation work. Thus, it is often not easy to ensure accuracy and precision in both qualitative and quantitative analyses. This study proposed a new technique applicable to improve quality control of aquatic ecosystem monitoring and assessment using BADs. In order to meet the purpose of quality control, we developed a permanent mounting slide technique which can be used for both qualitative and quantitative analyses simultaneously. We designed specimens with the combination of grid on both cover and slide glasses and compared their efficiency. As a result of observation and counting of BADs, the slide glass designed with the color-lined grid showed the highest efficiency compared to other test conditions. We expect that the method developed in this study could be effectively used to analyze BADs and contributed to improve the quality control in aquatic ecosystem health monitoring and assessment.
        4,200원
        13.
        2023.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        This study proposes a methodology for assessing seismic liquefaction hazard by implementing high-resolution three-dimensional (3D) ground models with high-density/high-precision site investigation data acquired in an area of interest, which would be linked to geotechnical numerical analysis tools. It is possible to estimate the vulnerability of earthquake-induced geotechnical phenomena (ground motion amplification, liquefaction, landslide, etc.) and their triggering complex disasters across an area for urban development with several stages of high-density datasets. In this study, the spatial-ground models for city development were built with a 3D high-precision grid of 5 m x 5 m x 1 m by applying geostatistic methods. Finally, after comparing each prediction error, the geotechnical model from the Gaussian sequential simulation is selected to assess earthquake-induced geotechnical hazards. In particular, with seven independent input earthquake motions, liquefaction analysis with finite element analyses and hazard mappings with LPI and LSN are performed reliably based on the spatial geotechnical models in the study area. Furthermore, various phenomena and parameters, including settlement in the city planning area, are assessed in terms of geotechnical vulnerability also based on the high-resolution spatial-ground modeling. This case study on the high-precision 3D ground model-based zonations in the area of interest verifies the usefulness in assessing spatially earthquake-induced hazards and geotechnical vulnerability and their decision-making support.
        4,000원
        14.
        2023.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Prebiotics are known as components of intestinal microbiota that can improve and maintain human health status by stimulating the growth and activity of the intestinal tract as a method of controlling the intestinal environment. In this study, we examined whether 2’-fucosyllactose (FL) could affect intestinal microbial population and bowel activity. Water content and frequency of mouse feces were increased in the 2’-FL treated group at a high concentration (1,000 mg/kg), with brightness of the color enhanced and physical properties diluted. In addition, intestinal microbial analysis showed that harmful bacteria Clostridium and Staphylococcus strains were decreased and beneficial bacteria such as Lactobacillus strains were markedly increased in the group treated with a high concentration of 2’-FL compared to those in the control group. These findings suggest that administration of 2’-FL can maintain healthy bowel activity by reducing harmful bacteria population and improving diluted physical properties.
        4,000원
        15.
        2023.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        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.
        4,000원
        17.
        2023.02 KCI 등재 구독 인증기관 무료, 개인회원 유료
        20세기 중반 이후, 선교의 주체를 교회에서 하나님으로 새롭게 인식하는 등 선교신학의 큰 변화가 있었다. 물론, 하나님의 선교에 대한 구체적인 이해는 매우 다양하다. 선교의 실천 영역의 변화 중 하나는 선교사 자원의 변화였다. 1980년대를 지나며 서구 선교사의 퇴조가 눈에 띄기 시작했다. 세계 교회는 넉넉한 자원을 가진 교회만 타문화권 선교를 할 수 있다는 오류에 빠져있다. 이것은 고도 근시의 시력으로 선교 역사를 보기 때문에 발생했다. 한편, 영국 특수 침례교회 의 타문화권 선교의 시작은 그렇지 않음을 분명히 보여준다. 핍박과 냉대를 받는 교회, 작고 가난한 교회, 왜곡되고 균형을 잃은 신학을 가졌던 교회, 타문화권 선교에 대한 부정적인 정서를 가졌던 교회, 선교지를 잘 모르는 교회도 선교의 잠재력을 가지고 있다. 단, 건전한 신앙과 신학으로 영적 갱신을 이루고, 지역 교회들이 연합하여 힘을 모은다면, 중동 이슬람권이나 부탄과 북한처럼 폐쇄국가를 제외한 나머지 지역의 교회들은 타문화권 선교의 잠재력을 가지고 있다.
        8,300원
        18.
        2023.02 KCI 등재 구독 인증기관 무료, 개인회원 유료
        This study was conducted to evaluate the filtration performance according to the feed temperature composed of NaCl and the operating pressure of the brackish water reverse osmosis (BWRO) process. The temperature is known that decides the filtration performance of reverse osmosis (RO). It is noted that temperature increase activates the permeate of salts due to augment of diffusivity and mass transfer. Filtration of the lab-scale RO system was performed with constant pressure and the constant flow was simulated. The salt rejection measured by the concentration of the feed and permeate was compared with water permeability and salt permeability in the conditions containing various temperatures (5, 10, 15, 20, 25, and 30℃) and pressures (10, 12, 15, and 18 bar). An increase in feed temperature from 5 °C to 30 °C caused a 4.65% decrease in salt rejection in CSM, due to an increase in salt permeability (4.06 times) rather than an increase in water permeability (2.62 times). Specific energy consumption (SEC) was calculated by using an electricity meter set in the RO system. It was expected that the SEC by the increases in temperature and pressure decreased due to the viscosity decline of the feed and the permeate flux augment, respectively. The SEC decreased by 63.4% in CSM and by 54.3% in Nittodenko when the feed temperature increased from 5 °C to 30 °C. It discussed how to operate the optimal RO process through the effect of temperature and operating pressure and the comparison of SEC.
        4,000원
        19.
        2023.02 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Fish samples were collected by a set net from April to December 2020 at the coastal waters off Tongyeong, Korea to determine fish species composition and seasonal variation. A total of 330,675 fish (1,032,578 g) representing 56 species belonging to 39 families were collected during the sampling period. The dominant species were Engraulis japonicus, Trachurus japonicus and Trichiurus japonicus, which accounted for 98.1% of the total number of individuals and 87.5% of the total biomass collected. E. japonicus and Chelidonichthys spinosus appeared every month off the coast of the Tongyeong. Cluster analysis based on the number of individuals of fish were classified into two groups at the dissimilarity level of 57%, and the results of ANOSIM analysis revealed significant differences in community structure among the two groups
        4,000원
        20.
        2022.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        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.
        4,000원
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