B-C유 발전소에서의 CO₂ 배출계수 산정연구

변지은,이시형,홍기협,전의찬 한국대기환경학회 2012 한국대기환경학회 학술대회논문집 Vol.2012 No.5

제주지역 중증도 별 응급실 내원환자 특성

변지은,김원,현은오,이경진 대한응급의학회 2022 대한응급의학회 학술대회초록집 Vol.2022 No.2

Assessment of Maxillary Sinus Wall Thickness with Paranasal Sinus Digital Tomosynthesis and CT

변지은,심성신,김유경,공경애 대한영상의학회 2017 대한영상의학회지 Vol.76 No.5

Purpose: This study was performed to compare paranasal sinus tomosynthesis with computed tomography (CT) imaging as a radiologic tool to evaluate the paranasal sinuses, using measurement of the soft tissue thickness of the maxillary sinus. Materials and Methods: A total of 114 patients with sinusitis who underwent both paranasal sinus digital tomosynthesis (DT) and CT were enrolled in this retrospective study. Two observers independently assessed soft tissue thickness in both maxillary sinus chambers using both DT and CT images. Results: The mean difference in soft tissue thickness measured by each observer was -0.31 mm on CT and 0.15 mm on DT. The mean differences in soft tissue thickness measured with DT and CT were -0.15 by observer 1 and -0.31 by observer 2. Evaluation of the agreement in measurement of soft tissue thickness in the maxillary sinus using DT and CT showed a high intraclass correlation, with the 95% limit of agreement ranging from -3.36 mm to 3.06 mm [intraclass correlation coefficient (ICC), 0.994: p < 0.01] for observer 1 and from -5.56 mm to 4.95 mm (ICC, 0.984: p < 0.01) for observer 2. Conclusion: As an imaging tool, DT is comparable to CT for assessing the soft tissue thickness of maxillary sinuses in patients with sinusitis.

한우퇴비 시용에 따른 옥수수(Zea mays L.)의 생육에 미치는 영향

변지은,이준경,박민수,조나연,김수량,홍성하,이병오,이명규,황선구 한국작물학회 2022 한국작물학회지 Vol.67 No.3

ABSTRACT We studied the influence of Hanwoo (Korean native cattle) manure compost soil application on the growth and yield of maize (Zea mays L.). We compared the soil application of chemical fertilizer (CF), commercial manure (CM), Hanwoo manure (HM), and the mixed Hanwoo manure and chemical fertilizer (HM + CF). CF application showed faster tasseling and silking dates compared to the other treatments. During the early plant growth stage of maize, CF application resulted in taller plant height, However, during later growth stages (55 days after transplanting). HM (226.0 cm) and HM + CF (230.0 cm) treatment resulted in taller plant height compared to CF (216.2 cm). Post-harvest measurement results showed that, the ear length was longer in HM (22.13 cm) and HM + CF (22.70 cm) compared to others, while ear diameter, ear weight, and 100-grains weight showed no significant difference among CF, HM, and HM + CF groups. The use of HM resulted in delayed growth during the early stages of plant development compared to CF. However, crop productivity markers of ear weight and ear diameter showed no significant difference compared to CF. Thus, HM treatment was comparable to CF treatment in maize cultivation. 적 요화학비료 처리구가 한우퇴비 처리구보다 출웅기는 2일, 출사기는 4일정도 빨랐다. 초장은 생육초기에는 화학비료 처리구가 가장 길었으나 생육후기(정식 55일차)에는 한우퇴비처리구가 화학비료 처리구보다 초장이 길었다. 이는 화학비료 처리구가 한우퇴비 처리구보다 출사기가 빨라 화학비료처리구의 생장기간이 한우퇴비 처리구보다 짧았기 때문에나타난 현상으로 보인다. 수확 후 이삭길이는 한우퇴비 시용처리구에서 가장 길었으며, 이삭 직경, 이삭무게, 백립중의경우에는 화학비료 처리구와 한우퇴비 시용 처리구가 유의한 차이를 보이지 않았다. 종합적으로 한우퇴비 시용 시 이삭길이의 경우에는 한우퇴비 시용하는 것이 더 길었으며, 이삭무게와 백립중은 화학비료 시용 시와 큰 차이를 보이지 않아 한우퇴비가 화학비료를 대체할 수 있을 것으로 보인다.

통합 혐기소화액별 폭기처리에 따른 화학적 성분 변화와 무의 발아효과

변지은,이홍주,류종원,황선구,Byeon, Ji-Eun,Lee, Hong-Ju,Ryoo, Jong-Won,Hwang, Sun-Goo 한국작물학회 2020 한국작물학회지 Vol.65 No.4

This study aimed to determine the minimum period of aeration treatment of co-digestate to develop it as liquid fertilizer and the chemical changes that occur in the aerobic liquefying process. The co-digestates were divided into three types depending on their additives: swine slurry anaerobic digestate (SS AD), swine slurry 70% + cow slurry 30% anaerobic digestate (SS + CS AD), and swine slurry 70% + apple pomace 30% anaerobic digestate (SS + AP AD). The pH of all co-digestates increased rapidly after 3 days of aerobic treatment, but had slightly decreased in SS AD after 9 days and in SS + CS AD and SS + AP AD after 15 days. All co-digestates showed a strongly reduced pH between 27 and 36 days of aeration treatment. SS AD had lower pH value, dissolved oxygen (DO), NH₄-N, and NO₃-N content under aerobic conditions than other co-digestates. To assess the fully decomposed liquid fertilizer, a germination test was performed on the undiluted and diluted co-digestate using the liquid fertilizer germination index (LFGI) method. The relative germination ratio, relative root elongation, and germination index of SS AD were higher than those of the others. When the LFGI method was used for the germination test, all co-digestates showed an appropriate germination index of 70 after 60 days of aeration treatment. Thus, we suggest that the minimum period of aeration treatment for co-digestates might be 60 days to develop the fully decomposed liquid fertilizer.

혐기소화액을 배지로 이용한 클로렐라 배양액 처리가 페레니얼라이그라스 종자 발아에 미치는 영향

변지은,이진웅,최민수,류종원,Byeon, Ji-Eun,Lee, Jin Woong,Choi, Min Soo,Ryoo, Jong-Won 한국초지조사료학회 2018 한국초지조사료학회지 Vol.38 No.1

본 연구는 혐기소화발효액을 배지로 이용하여 클로렐라를 배양한 배양액이 페레니얼라이그라스 종자 발아에 미치는 영향을 구명하기 위하여 혐기소화발효액, 클로렐라 배양액, 클로렐라 배양여액, 혐기소화발효액, 무처리구(물)을 처리하여 종자 발아시험을 수행하였다. 페레니얼 라이그라스 종자의 최종 발아율은 무처리구의 70.2%와 비교하여 클로렐라 배양액 처리구가 91.9%로 21.2% 높았다. 또한 상대발아율도 클로렐라 배양액 처리구가 클로렐라 배양액을 처리하지 않은 무처리구(물) 보다 25% 높았다. 페레니얼 라이그라스 종자의 50% 발아에 소요되는 일수(T50)는 클로렐라 배양액 3.3~3.5일로 무처리구의 4.7~5.1일보다 빨랐다. 페레니얼 라이그라스 종자의 뿌리길이는 클로렐라 배양액 처리구가 무처리(물)보다 1~2cm이상 길었다. 상대적 뿌리신장율은 클로렐라 배양액 처리구의 무처리구보다 40% 높았다. 페레니얼 라이그라스 종자의 발아지수(GI)는 클로렐라 배양액 처리구가 182로 무처리구(물)의 100 보다 높았다. 종자의 부패율은 치상 후 11일째에 무처리구와 혐기소화발효액 처리구가 각각 83.3, 86.7%으로 높았으나 클로렐라 배양액 처리구는 50.0%로, 클로렐라 배양여액 처리구가 53.3%로 부패율이 낮았다. 클로렐라 배양액, 클로렐라 배양여액 처리가 종자의 부패방지 효과를 나타내었다. This experiments were conducted to evaluate the influence of Chlorella culture solution using anaerobic digestate as medium on seed germination of perennial ryegrass seeds. Four treatments were compared: control with distilled water, anaerobic digestate, Chlorella culture solution and Chlorella culture filtrate. The germination percentage of perennial ryegrass seeds was highest in the Chlorella culture solution treatment. Days required for 50, 70% seed germination were faster at 1.7 day in Chlorella culture solution compared to control. Root length of perennial ryegrass seeds was longer by 1~2cm in the Chlorella culture solution compared with control. The relative root length was by 40% longer in the Chlorella culture solution treatment compared to control. The germination index (GI) of perennial ryegrass seeds was higher by 180~202% in the Chlorella culture solution treatment compared to control. The decay rate was low as 50.0% in Chlorella culture solution, but decay rate of perennial ryegrass seeds showed 86.7~83.3% in control plot and in anaerobic digestate, respectively. Chlorella culture solution have shown stimulatory effects in germination and development of root. Overall, Chlorella culture solution could be useful to apply for promotion of germination and root elongation of seeds.

Evaluation of Soil Characteristics and Rice Productivity in a Paddy Field with Annual Application of Organic Resources

변지은,이윤혜,심재홍,이유나,권순익 한국토양비료학회 2022 한국토양비료학회지 Vol.55 No.4

This study was carried out to investigate the effect of the annual application of organic resources on the soilenvironment and rice production. The experiment consisted of five treatments; NF (no-fertilization), NPK(inorganic fertilizer), NPKR (inorganic fertilizer + rice straw), NPKC (inorganic fertilizer + cow compost) andNPKS (inorganic fertilizer + swine compost). Soil organic matter content was not different for all treatmentsin 2021. The soil organic carbon (SOC) and soil organic carbon stock (SOC stock) were not difference for alltreatments in 2021. The highest rice production was NPKR treatment in 2018 and 2021. However, the riceproduction was no significant difference among the other organic resource application treatments (NPKR,NPKC, NPKS) and only inorganic fertilizer treatment. The application of organic resources can improve thesoil environment and increase crop production. Still, long-term studies are needed to evaluate the impact of theapplication of organic resources on the soil environment and crop production.

사철검은재나무(Symplocos nakaharae (Hayata) Masam.)의 개체군 특성 및 국가적색목록 평가

변지은,권신영,윤석민,김소담,박정석,이주희,정지영 한국환경생태학회 2023 한국환경생태학회 학술대회지 Vol.33 No.2

혐기소화액의 pH 조절이 액비화 과정 및 종자 발아에 미치는 영향

변지은,이홍주,류종원,황선구 (사)한국축산환경학회 2021 한국축산시설환경학회지 Vol.23 No.1

This study aimed to survey the chemical change and germination effect of anaerobic digestate after pH adjustment and aerobic treatment. The amount of ammonia (NH3) in swine slurry anaerobic digestates (SS AD) of pH 7.0 and pH 6.5 were lower than that of un-adjusted anaerobic digestate. Especially, the anaerobic digestate with pH 6.5 had the lowest NH3 generation. The amount of NH4-N has been gradually decreasing in the untreated anaerobic digestate, however, the anaerobic digestates with pH 7.0 and pH 6.5 showed no significant changes. In the germination tests with different methods, the germination index (GI) of anaerobic digestates with pH 7.0 and pH 6.5 was higher than that of un-adjusted anaerobic digestate. Thus, the pH adjustment will be useful to decrease the gas generation such as NH3, which causes the odor generated from anaerobic digestate.

가축분뇨 퇴액비가 시용된 비닐하우스의 내외부 CO2 농도와 온도 변화 실태 조사 연구

변지은,임진수,류종원,황선구 (사)한국축산환경학회 2023 한국축산시설환경학회지 Vol.25 No.2

The areas of vinyl greenhouse have steadily grown in Korea. Climate condition is far from optimal inside vinyl greenhouses because of the limited ventilation and lack of cooling and heating. Carbon dioxide was more than 50% higher than pre-industrial levels. Agricultural activities are estimated to account for about 13.5% of the total greenhouse gas. The objective of this study was to predict the CO2 concentration and temperature in the inside and outside of vinyl greenhouse applied compost and liquid fertilizer. In this study, we compared the CO2 concentration and temperatures inside and outside greenhouses. The investigation was performed in 54 vinyl greenhouses located in Yeoju and Boryeong regions, Korea. The CO2 concentration inside and outside of vinyl greenhouse were measured in the period from 2021 to 2022. The mean CO2 concentration inside a greenhouse in the Yeoju and Boryeong was 499.6 and 516.2 ppm, respectively. Inside the greenhouse, the highest mean CO2 concentration had values of 600.8 ppm, and the minimum level of CO2 was 477 ppm in Boyeong. The seasonal CO2 concentration was observed in March and April with a maximum occurrence and in July-August with a minimum occurrence. The average CO2 concentration of inside the vinyl greenhouse is 10.1 ppm higher than that of outside atmospheric CO2 concentration. During summer season, inside temperatures was high as 31.9~33.7°C. The difference between the inside and outside temperatures of vinyl house was around 1~3°C. Therefore monitoring of CO2 concentration and temperature of vinyl greenhouse is needed.