• 비파괴검사학회지
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• 제32권5호
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• pp.518-525
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• 2012

본 연구에서는 초분광 반사광 영상기술을 이용하여 비파괴적으로 상추의 건전종자와 퇴화종자를 선별하는 기술을 개발하고자 하였다. 750~1000nm의 근적외선 초분광 반사광 영상의 분광데이터를 이용하여 상추의 발아종자와 불발아 종자를 판별하는 PLS-DA 모델을 개발하고 개발된 모델의 성능 평가를 실시하였다. 모델 calibration의 판별 정확도는 81.6%였으며, test의 결과는 81.2%의 판별 정확도를 보였다. 또한 개발된 PLS-DA 모델을 적용한 초분광 반사광 영상을 이용하여 대량의 불발아 종자를 동시에 영상으로 검출 가능한 영상처리 알고리즘을 개발하였다. 초분광 반사광 영상에 PLS-DA 모델이 적용된 영상을 이용한 검출 정확도는 91%로 나타났으며, 이는 초분광 반사광 영상을 이용하여 대량의 상추 종자의 비파괴 품질선별에 이용될 수 있음을 보여 주었다.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2006년도 PAN PACIFIC CONFERENCE vol.2
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• pp.305-309
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• 2006

This paper presents and illustrates the application of a growth and yield model that supports both forest and mill side volume and value estimates. Traditional forest stand growth and yield models represent the forest landowner view of yield and economics. Predicted yields are estimates of what one would expect from a procurement cruise, and current stumpage prices are applied to investigate optimum management strategies. Optimum management regimes and rotation ages obtained from the forest side view are unlikely to be economically optimal when viewed from the mill side. The actual distribution of recoverable manufactured product and its value are highly dependent on mill technologies and configurations. Overcoming this limitation of growth and yield computer models necessitates the ability to predict and price the expected manufactured distribution of lumber, lineal meters of veneer, and tonnes of air dried pulp fiber yield. With these embedded models, users of the yield simulator can evaluate the economics of possible/feasible management regimes from both the forest and mill business sides. The simulator is a forest side model that has been modified to produce estimates of manufactured product yields by embedding models for 1) pulpwood chip size class distribution and pulp yield for any kappa number (Schultz and Matney, 2002), 2) a lumber yield and pricing model based on the Best Opening Face model developed by the USDA Forest Service Forest Products Laboratory (Lewis, 1985a and Lewis, 1985b), and 3) a lineal meter veneer model derived from peeler block tests. While the model is strictly applicable to planted loblolly pine (Pinus taeda L.) on cutover site-prepared land in the United States (US) Gulf South, the model and computer program are adaptable to any region and forest type.

• 지질공학
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• 제31권3호
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• pp.269-281
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• 2021

Land creeping is the imperceptibly slow, steady, downward movement o f slope-forming soil or rock. Because creep-related failures occur frequently on a large scale without notice, they can be hazardous to both property and human life. Korea Forest Service has operated the prevention and response system from land creeping which has been on the rise since 2018. We categorized and proposed three survey steps (e.g., preliminary, regional, detailed) for investigation of creeping susceptibility site with a focus on geophysical mapping of a selected test site, Yongheung-dong, Pohang, Korea. The combination of geophysical (dipole-dipole electrical resistivity tomography and reciprocal seismic refraction technique, well-logging), geotechnical studies (standard penetrating test, laboratory tests), field mapping (tension cracks, uplift, fault), and comprehensive interpretation of their results provided the reliable information of the subsurface structures including the failure surface. To further investigate the subsurface structure including the sliding zone, we performed high-resolution geophysical mapping in addition to the regional survey. High-resolution seismic velocity structures are employed for stability analysis because they provided more simplified layers of weathering rock, soft rock, and hard rock. Curved slip plane of the land creeping is effectively delineated with a shape of downslope sliding and upward pushing at the apex of high resistive bedrock in high-resolution electrical resistivity model with clay-mineral contents taken into account. Proposed survey steps and comprehensive interpretation schemes of the results from geological, geophysical, and geotechnical data should be effective for data sets collected in a similar environment to land-creeping susceptibility area.

• 농촌의학ㆍ지역보건
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• 제44권2호
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• pp.90-93
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• 2019

브루셀라증은 인수공통감염병 중의 하나이며, 우리나라에서는 과거에 비해 거의 근절된 질병이다. 또한 브루셀라증은 우리나라에서 원헬스로 대표되는 상징적인 질병이기도 하다. 이 연구는 민간(경북농업안전보건센터), 가축방역(동물위생시험소) 및 보건당국(보건소) 간의 상호 협력체계를 구축하여 가축전염병 발생 농장 농장주와 가족을 대상으로 브루셀라증 환자 1례를 발견한 사례이다. 이 사례를 통해 인수공통감염병 예방과 관리에 부문간의 협력이 중요함을 다시 인식하는 계기가 되었다.

• 한국화재소방학회논문지
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• 제33권1호
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• pp.113-120
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• 2019

점차 삶의 수준이 향상됨에 따라 건강하고 여유로운 삶에 대한 니즈가 증가하고 있다. 문화에 대한 대중의 니즈를 반영하여 국내에는 여러 개의 상영관으로 구성된 멀티플렉스가 빠른 속도로 보급되고 있다. 그러나 화재발생 시 피난안전 측면에 있어 위험성을 내포하고 있다. 건물의 공간 형태에 익숙하지 않은 불특정 다수의 관객은 피난으로 인한 입장 및 퇴장 동선의 충돌로 혼잡을 겪게 되기 때문이다. 따라서 본 연구에서는 이러한 문제점을 해결하기 위하여 피난시간을 단축할 수 있는 방안을 마련하고자, 상영관별 단계적 피난을 적용하여 피난시뮬레이션을 실시하였다. 해석 결과, 전 상영관이 동시 피난하는 것보다 상영관별로 단계적인 피난하는 것이 피난시간 확보에 유리한 것으로 나타났다.

• Journal of Preventive Medicine and Public Health
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• 제52권5호
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• pp.308-315
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• 2019

Objectives: Estimating influenza-associated mortality is important since seasonal influenza affects persons of all ages, causing severe illness or death. This study aimed to estimate influenza-associated mortality, considering both periodic changes and age-specific mortality by influenza subtypes. Methods: Using the Microdata Integrated Service from Statistics Korea, we collected weekly mortality data including cause of death. Laboratory surveillance data of respiratory viruses from 2009 to 2016 were obtained from the Korea Centers for Disease Control and Prevention. After adjusting for the annual age-specific population size, we used a negative binomial regression model by age group and influenza subtype. Results: Overall, 1 859 890 deaths were observed and the average rate of influenza virus positivity was 14.7% (standard deviation [SD], 5.8), with the following subtype distribution: A(H1N1), 5.0% (SD, 5.8); A(H3N2), 4.4% (SD, 3.4); and B, 5.3% (SD, 3.7). As a result, among individuals under 65 years old, 6774 (0.51%) all-cause deaths, 2521 (3.05%) respiratory or circulatory deaths, and 1048 (18.23%) influenza or pneumonia deaths were estimated. Among those 65 years of age or older, 30 414 (2.27%) all-cause deaths, 16 411 (3.42%) respiratory or circulatory deaths, and 4906 (6.87%) influenza or pneumonia deaths were estimated. Influenza A(H3N2) virus was the major contributor to influenza-associated all-cause and respiratory or circulatory deaths in both age groups. However, influenza A(H1N1) virus-associated influenza or pneumonia deaths were more common in those under 65 years old. Conclusions: Influenza-associated mortality was substantial during this period, especially in the elderly. By subtype, influenza A(H3N2) virus made the largest contribution to influenza-associated mortality.

• 한국화재소방학회논문지
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• 제33권1호
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• pp.171-178
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• 2019

재난안전 R&D는 2008년 이후 지속적인 예산 증가 추세에도 불구하고 소방안전 R&D 예산은 극히 일부에 불과하여 소방산업의 경제성장을 견인할 만한 성과가 도출되지 못하고 있다. 이에 본 연구는 소방안전 R&D인 현장중심형 소방활동지원 기술개발사업을 대상으로 질적 성과에 영향을 미치는 요인이 무엇인지를 분석함으로써 향후 소방안전 R&D의 예산 확대, 연구개발 역량 강화 및 성과 양산 방안에 대한 시사점을 주는데 목적이 있다. 통계 프로그램(SPSS statistics 21.0)을 사용하여 일원배치 분산분석과 회귀분석을 통한 실증분석을 실시하였으며 결과적으로 본 연구를 통해 질적으로 우수한 특허와 논문 성과를 창출하기 위해서는 지속적인 투자 확대와 우수한 연구인력이 필요함을 시사한다.

• 한국수산과학회지
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• 제54권5호
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• pp.634-643
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• 2021

Han In-jin (Artemisia iwayomogi Kitamura) and Cham Dang-gwi (Angelica gigas Nakai) exhibit antibacterial, antiparasitic, antifungal, and antiviral properties in vitro. In this study, mixture of the extracts of these two medicinal plants was absorbed on pellets. Thereafter, these pellets were fed to olive flounder Paralichthys olivaceus for 12 weeks at laboratory (1^st experiment) and 24 weeks at field test (2^nd experiment), and the immune activity and disease resistance properties of the extracts were examined. It was observed that lysozyme activities of plasma, spleen, and kidney improved after 12 weeks. Furthermore, when the olive flounders were artificially infected with bacterial pathogens, their cumulative mortality decreased in the group that was fed the extracts for 12 weeks compared to that in control group, and the relative percent survival also improved. This study concluded that mixture of Han In-jin and Cham Dang-gwi extracts provides disease resistance in vivo.

• 한국환경복원기술학회지
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• 제23권6호
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• pp.29-41
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• 2020

Wild pollinators provide important pollination services for crops. However, their geographical ranges and impact on pollination services have not been fully explored within the scope of Korean agricultural land. This study aims to identify spatial supply-demand mismatches across orchard fields in the context of assessing pollination service risk. We first used National Ecosystem Survey data and a species distribution model (MaxEnt) to develop the geographic range of each of 32 wild pollinators belonging to three families (Diptera, Hymenoptera, and Lepidoptera). We then summed the modeled presence probability of each species to obtain a measure of spatially explicit pollinator richness. This modeled richness, defined as pollination supply, was compared with the summed area of orchard fields at the municipal boundary level to identify areas with supply-demand mismatches. The study found that Lepidoptera showed the highest species richness (8.3±1.5), followed by Hymenoptera (4.3±0.8) and Diptera (3.5±0.8) species. Median orchard area was 1.5 ㎢ (range of 0-176.7 ㎢) among 250 municipal regions in South Korea. The municipal regions were divided into three categories (tertiles) of low, middle, and high pollination supply and demand according to, respectivley, average polliator richness and orhard area. Finally, we found that 55 municipal regions (accounting for 49% of national orchard land) potentially faced high risk of pollination deficits, 81 regions (48% of national orchard land) faced intermediate risk, and 63 regions faced low risk (3% of national orchard land). In conclusion, this study revealed significant mismatch between pollination supply and demand and developed risk assessment map will guide our future efforts on pollinator habitat conservation and monitoring to conserve crop pollination services.

• 농업과학연구
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• 제47권4호
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• pp.995-1010
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• 2020

In this study, a multivariate analysis model of partial least square regression (PLSR) was developed to predict the moisture content of green peppers using hyperspectral imaging (HSI). In HSI, illumination is essential for high-quality image acquisition and directly affects the analytical performance of the visible near-infrared hyperspectral imaging (VIS/NIR-HSI) system. When green pepper images were acquired using a direct lighting system, the specular reflection from the surface of the objects and their intensities fluctuated with time. The images include artifacts on the surface of the materials, thereby increasing the variability of data and affecting the obtained accuracy by generating false-positive results. Therefore, images without glare on the surface of the green peppers were created using a polarization filter at the front of the camera lens and by exposing the polarizer sheet at the front of the lighting systems simultaneously. The results obtained from the PLSR analysis yielded a high determination coefficient of 0.89 value. The regression coefficients yielded by the best PLSR model were further developed for moisture content mapping in green peppers based on the selected wavelengths. Accordingly, the polarization filter helped achieve an uniform illumination and the removal of gloss and artifact glare from the green pepper images. These results demonstrate that the HSI technique with a polarized lighting system combined with chemometrics can be effectively used for high-throughput prediction of moisture content and image-based visualization.