• Nuclear Engineering and Technology
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• 제54권2호
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• pp.479-485
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• 2022

At the Korea Institute of Radiological and Medical Sciences, physical human phantoms were developed to evaluate various radiation protection quantities, based on the mesh-type reference computational phantoms of the International Commission on Radiological Protection. The physical human phantoms were fabricated such that a radiophotoluminescent glass dosimeter (RPLGD) with a Tin filter, namely GD-352M, could be inserted into them. A Tin filter is used to eliminate the overestimated signals in low-energy photons below 100 keV. The measurement uncertainty of the RPLGD reader system based on GD-352M should be analyzed for obtaining reliable protection quantities before using it for practical applications. Generally, the measurement uncertainty of RPLGD systems without Tin filters is analyzed for quality assurance of radiotherapy units using a high-energy photon beam. However, in this study, the measurement uncertainty of GD-352M was analyzed for evaluating the protection quantities. The measurement uncertainty factors in the RPLGD include the reference irradiation, regression curve, reproducibility, uniformity, energy dependence, and angular dependence, as described by the International Organization for Standardization (ISO). These factors were calculated using the Guide to the Expression of Uncertainty in Measurement method, applying ISO/ASTM standards 51261(2013), 51707(2015), and SS-ISO 22127(2019). The measurement uncertainties of the RPLGD reader system with a coverage factor of k = 2 were calculated to be 9.26% from 0.005 to 1 Gy and 8.16% from 1 to 10 Gy. A blind test was conducted to validate the RPLGD reader system, which demonstrated that the readout doses included blind doses of 0.1, 1, 2, and 5 Gy. Overall, the E_n values were considered satisfactory.

• Safety and Health at Work
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• 제13권2호
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• pp.248-254
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• 2022

Background: Occupational hazards in crop farms vary diversely based on different field operations as soil management, harvesting processes, pesticide, or fertilizer application. We aimed at evaluating the immunological status of crop farmers, as limited systematic investigations on immune alteration involved with crop farming have been reported yet. Methods: Immunological parameters including plasma immunoglobulin level, major peripheral immune cells distribution, and level of cytokine production from activated T cell were conducted. Nineteen grape orchard, 48 onion open-field, and 21 rose greenhouse farmers were participated. Results: Significantly low proportion of natural killer (NK) cell, a core cell for innate immunity, was revealed in the grape farmers (19.8±3.3%) in comparison to the onion farmers (26.4±3.1%) and the rose farmers (26.9±2.5%), whereas cytotoxic T lymphocyte proportion was lower in the grape and the onion farmers than the rose farmers. The proportion of NKT cell, an immune cell implicated with allergic response, was significantly higher in the grape (2.3±0.3%) and the onion (1.6±0.8%) farmers compared with the rose farmers (1.0±0.4%). A significantly decreased interferon-gamma:interleukin-13 ratio was observed from ex vivo stimulated peripheral blood mononuclear cells of grape farmers compared with the other two groups. The grape farmers revealed the lowest levels of plasma IgG1 and IgG4, and their plasma IgE level was not significantly different from that of the onion or the rose farmers. Conclusion: Our finding suggests the high vulnerability of workplace-mediated allergic immunity in grape orchard farmers followed by open-field onion farmers and then the rose greenhouse farmers.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제36권4호
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• pp.611-626
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• 2022

본 연구에서는 교육부가 고심하는 '수학울렁증(Mathematics Anxiety, 수학불안)' 문제를 근본적으로 해결하는 하나의 대안으로, 2022년 1학기 S대학에서 직업계 고등학교를 졸업한 재직자 신입생 20명을 대상으로 'Math & 코딩(Coding)'을 적용하여 운영한 대학 미분적분학 강좌 사례를 소개한다. 본 강좌에서는 'Math & 코딩'으로 쉽고 빠르게 중·고등학교 수학을 복습할 수 있는 콘텐츠와 대학 미분적분학 콘텐츠 및 교재를 새로 개발하여 활용하였다. 이를 통해 스스로 '수학울렁증'이 있다고 여기던 학생들은 코드를 활용하여 문제를 해결하면서 복잡한 계산에 대한 부담을 덜게 되었고, 대신 확보한 시간을 수학 개념에 대해 동료 및 교수자와 토론하면서 미분적분학을 충분히 이해할 수 있게 되었다. 그 결과 본 강좌를 수강한 대부분의 학생들은 미분적분학 교재에 있는 거의 모든 문제를 지필로 또는 코드를 활용하여 해결할 수 있다고 자신있게 이야기 하였고, 미분적분학에서 다루는 주요 개념에 대해서도 자신의 언어로 충분히 설명할 수 있다고 하였다. 이와 같이 대학의 수학강좌 교수학습과정에서 'Math & 코딩' 방식을 적절하게 활용한다면, 수학적 배경이 약한 학생들과 이전에 수학을 포기했었던 학생들을 대상으로 대학에서 다시 수학에 대한 자신감을 회복시키는 것이 가능하다고 여겨지며, 중등수학교육에서도 'Math & 코딩' 접근방식을 충분히 적용해 볼 수 있다고 생각한다.

• Ecology and Resilient Infrastructure
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• 제10권1호
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• pp.11-19
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• 2023

전세계적으로 외래생물의 침입이 생물다양성을 위협하는 것으로 보고되며, 국내외로 외래생물의 유입에 대한 관심이 증가하고 있다. 우리나라 환경부에서는 유입주의 생물 지정을 통해 국내에 유입되었을 때 생태계 피해가 유발될 수 있는 잠재적 외래생물을 관리하고 있다. 본 연구에서는 유입주의 생물로 지정된 포식성 어류인 북방민물꼬치고기 (Esox lucius)와 호주민물대구 (Maccullochella peelii)의 잠재 서식처를 전국 단위로 예측하였다. 서식처 적합도 평가를 위해 EHSM (Ecological Habitat Suitability Model)을 사용하였고, 수온 자료를 입력하여 생리적 서식처 적합도 지수 (Physiological Habitat Suitability; PHS)를 산출하였다. 예측 결과, 두 어류의 PHS는 고온 또는 저온 스트레스의 영향을 크게 받았으며, 이로 인해 서식처 적합도의 지역적 편향이 나타났다. 북방민물꼬치고기는 위도가 높은 한강과 금강 유역을 선호할 것으로 예측되었고, 호주민물대구는 대도시 지역을 선호하는 것으로 나타났다. 이러한 결과를 통해 외래어류의 침입 양상이 온도에 대한 선호도의 차이로 인해 상이할 것으로 예상할 수 있다. 향후, 모델의 예측력 향상을 위해 후속 연구가 필요하고, 지속가능한 대책 수립을 위해 기후변화 시나리오를 적용한 미래 예측 연구가 필요하다.

• ALGAE
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• 제37권3호
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• pp.227-237
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• 2022

Knowledge on the seaweeds of eastern Sorsogon in the Philippines is uneven. Not only is eastern Sorsogon among the areas of high seaweed diversity but locals there have interacted with seaweeds for ages. Despite seaweeds' assumed importance to Sorsoganon, ethnobotanical records are missing. In this study, we documented the traditional knowledge on seaweed use and determined the rate of knowledge transmission among the locals of eastern Sorsogon. Vernacular names and modes of preparation were given of the 12 identified species bearing culinary and medicinal importance. Ten species were eaten while three were used therapeutically. Based on ethnobotanical indices, Caulerpa chemnitzia ecad turbinata and Gelidiella acerosa were the most important seaweeds. The least cited was Caulerpa racemosa. Our study demonstrated that most of the seaweed resources in eastern Sorsogon remain largely untapped, as the identified ethnotaxa were only about 5% of the total seaweed species diversity reported for the area. The seaweed knowledge in eastern Sorsogon appeared to be homogenous across age groups with primary sources of knowledge biased towards female relatives (mothers and grandmothers) and to children as inheritors. Cessation of seaweed knowledge may come at a potential cost, as a significant fraction of the population did not transmit their knowledge to others. Our study furthered the interest in providing sophisticated resource management recommendations that consider the relationships of traditional and scientific knowledge of seaweed selection and use in eastern Sorsogon and beyond.

• Human Ecology Research
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• 제60권3호
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• pp.331-344
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• 2022

The purpose of this study was to identify a support method for the introduction of metaverse-based classes (MBC) in home economics (HE) education. This was achieved by diagnosing the stages of concern and levels of use exhibited by HE teachers applying the concerns-based adoption model (CBAM). Questionnaires were sent to a convenience sample of middle- and high-school HE teachers using the KSDC (Korea Social Science Data Center). Overall, 271 responses were received, and the data were analyzed using KSDC E-STAT 3.0 and SPSS 28.0.1.1. The results were as follows: First, regarding the level of knowledge of MBC, the introductory level was the most common (139 respondents, 51.3%,), followed by the beginner level (81, 29.9%), the intermediate level (28, 10.3%,), the advanced level (12, 4.4%), and the master level (11, 4.1%). Average responses on a 5-point Likert scale to questions about the use of metaverse in HE classes were as follows: possibility (4.02), necessity (3.82), and usefulness (3.90). Second, HE teachers' stages of concern in MBC were as follows (in descending order): unconcerned - stage 0, and information - stage 1 (86.9), personal - stage 2 (85.6), management - stage 3 (80.9), collaboration - stage 5 (57.5), consequence - stage 4 (57.4), and refocusing - stage 6 (55.2). Third, the use of MBC was highest for orientation - level 1 (173 respondents, 63.8%), followed by non-use - level 0 (34, 12.5%), preparation - level 2 (29, 10.7%), mechanical - level 3 (15, 5.5%), refinement - level 5 (8, 3.0%), renewal - level 7 (8, 3.0%), routine - level 4 (3, 1.1%), and integration - level 6 (1, 0.4%). Many HE teachers had heard about MBC but were in the introductory level of not knowing what it is, and at the stage of being unconcerned or wanting to know about MBC. Of the 271 respondents, only 35 used metaverse in classes. Therefore, it is necessary to provide teacher training opportunities that provide basic information on the significance and implementation of MBC for HE teachers. Also, an MBC guideline book should be developed and distributed to HE teachers. Finally, a teacher community meeting is needed to share the expertise of teachers with substantial experience in using MBC.

• 정보화정책
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• 제30권1호
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• pp.41-66
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• 2023

본 연구는 72개 지자체의 74개 스마트시티 조례를 대상으로, 지자체 스마트시티 조례의 방향성을 확인하고자 토픽모델링을 활용하여 조례의 주요 키워드를 확인하고, 조례의 키워드에 따른 주제분류를 진행하였다. 분석결과 주요 키워드는 스마트도시위원회의 구성 및 운영에 관한 키워드가 조례 내에서 높은 빈도를 보였다. 조례에 대한 토픽모델링 Latent Dirichlet Allocation(LDA) 분석결과 관련 키워드에 따라 총 8개의 주제로 분류할 수 있었다. 구체적으로 주제-1(스마트시티 추진사항 보안), 주제-2(스마트시티 산업진흥), 주제-3(스마트시티 주민협의체 구성), 주제-4(스마트시티 추진체계 지원), 주제-5(개인정보 관리), 주제-6(스마트시티 데이터 활용), 주제-7(지능정보화 행정구현), 주제-8(스마트시티 홍보) 등으로, 주제의 비중은 주제-6, 주제-4, 주제-1 등의 순으로 나타났다. 권역별 주제분류는 수도권은 주제-5, 주제-6, 주제-8 의 비중이 높았고, 지방권은 주제-2, 주제-3, 주제-4의 비중이 높아 수도권은 스마트시티의 실질 운영 관련 주제가 높았고, 지방권은 스마트시티 추진을 위한 준비단계 관련 주제 비중이 높았다.

• Fisheries and Aquatic Sciences
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• 제26권2호
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• pp.105-116
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• 2023

Improved fish post-harvest technologies (IFPT) have been promoted as more efficient methods of fish processing, preservation, and value addition than the traditional methods prevalent in developing countries. The adoption rates, however, do not appear to be convincing. The purpose of this study was to determine the socio-demographic and psychological factors that influence intention of Kenyan farmed fish traders to use IFPT. The technology acceptance model (TAM) was used to properly explain the impact of TAM constructs such as perceived usefulness (PU), perceived ease of use (PEOU), and attitude (ATT), as well as socio-demographic factors such as gender, age, education level and fish trading experience on traders' intention to use the technologies. A cross-sectional survey was conducted to collect data using a semi-structured questionnaire from 146 traders in Busia, Siaya and Kakamega counties. At a significance level of p = 0.05, a linear regression model was used to examine the socio-demographic and psychological determinants of the traders' behavioral intention to use the improved technologies. The regression analysis revealed that PU (β = 0.443; p = 0.000), PEOU (β = 0.364; p = 0.000) and ATT (β = 0.615; p = 0.000) influence traders' intention to use IFPT, with ATT having the highest influence on intention. However, the traders' socio-demographic characteristics have no effect on their intention to use the technologies, as the coefficients for gender (β = 0.148; p = 0.096), age (β = 0.016; p = 0.882), level of education (β = -0.135; p = 0.141) and fish trading experience (β = 0.017; p = 0.869) are all insignificant. These findings show that the traders intend to use IFPT and will use them when it is in their best economic interests.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제36권1호
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• pp.1-21
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• 2022

본 연구는 디지털 기술의 본격 활용에 따라 시간과 장소에 구애받지 않는 유연한 학습 환경 구축의 방안으로 제안되고 있는 에듀테크가 수학 교과에서 활용되기 위하여 그 현황을 분석하는 데 목적이 있다. 이에 따라 국내외 에듀테크 현황 및 활용 동향을 확인하며, 수학교과에서 활용되는 에듀테크 플랫폼의 기능과 그 역할을 분석하였다. 분석 결과, 에듀테크 플랫폼은 위계적 학문인 수학교육에서 학습자 개별 맞춤 학습에 유용할 수 있도록 그 기능을 구축해 나가고 있으며, 나아가 학습자의 자기주도학습을 추구하고 있었다. 또한 각 수업 단계에 맞는 활동 및 평가가 가능하여 교사의 업무경감 및 학습관리와 역량 강화 수업 등에 유용할 수 있도록 발전되어가고 있음을 확인하였다. 따라서 향후 이러한 플랫폼을 효율적으로 활용할 수 있는 교수설계 및 학생의 개별 맞춤형 학습 지원 활용 방안이 함께 수행되어질 필요가 있다.

• Animal Bioscience
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• 제37권2호
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• pp.274-283
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• 2024

Objective: The aim of the study was to evaluate the physicochemical properties (nutrient composition, pH, water content and activity, sorption properties) and mechanical properties (compression force and energy) of granulated feed mixtures with various inclusion levels of crude fibre concentrates ARBOCEL and VITACEL for broiler chickens, i.e. +0.0% (control group - group C), +0.3%, +0.8%, +1.0%, +1.2%. Methods: The feed mixtures were analyzed for their physicochemical properties (nutrient composition by near-infrared spectroscopy, pH with the use a CP-401 pH meter with an IJ-44C glass electrode, water content was determined with the drying method and activity was determined with the Aqua Lab Series 3, sorption properties was determined with the static method) and mechanical properties (compression force and energy with the use TA-HD plus texture analyzer). The Guggenheim-Anderson-de Boer (GAB) model applied in the study correctly described the sorption properties of the analyzed feed mixtures in terms of water activity. Results: The fibre concentrate type affected the specific surface area of the adsorbent and equilibrium water content in the GAB monolayer (p≤0.05) (significantly statistical). The type and dose of the fibre concentrate influenced the dimensionless C and k parameters of the GAB model related to the properties of the monolayer and multilayers, respectively (p≤0.05). They also affected the pH value of the analyzed feed mixtures (p≤0.05). In addition, crude fibre type influenced water activity (p≤0.05) as well as compression energy (J) and compression force (N) (p≤0.001) (highly significantly statistical) of the feed mixtures. Conclusion: The physicochemical analyses of feed mixtures with various inclusion levels (0.3%, 0.8%, 1.0%, 1.2%) of crude fiber concentrates ARBOCEL or VITACEL demonstrated that both crude fiber types may be used in the feed industry as a feedstuff material to produce starter type mixtures for broiler chickens.