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강석진 ( Kang Seog Jin ),이유영 ( Lee Yu Yeong ),고한중 ( Go Han Jung ),전경문 ( Jeon Gyeong Mun ),노태희 ( No Tae Hui ) 한국초등과학교육학회 2004 초등과학교육 Vol.23 No.1
In this study, we investigated the effects of using concept mapping as an instructional tool on 4th graders` achievement, science learning motivation, and attitude toward science classes. T재 classes (38 students) from an elementary school were respectively assigned to a control group and a treatment group. Students were taught about expansion of matter by heat and heat transfer. These topics were chosen because they require students to understand more concepts as well as relationships among them. A science learning motivation test and an attitude toward science classes test were administered as pretests. A researcher-made achievement test, the science learning motivation test, and the attitude toward science classes test were administered as posttests. The results indicated that using concept mapping in 4th-grade science classes was not significantly effective in improving students` achievement though a statistically significant positive effect was found in the subcategory of knowledge. No statistically significant effect of using concept mapping was found in the scores of the science learning motivation test and the attitude toward science classes test. Educational implications are discussed.
허태영,강석진,최창용,정영훈,조용일,류일선,손동수,김현섭,서국현,Hur, Tai-young,Kang, Seog-jin,Choe, Chang-yong,Jung, Young-Hun,Cho, Yong-il,Son, Dong-su,Ryu, Il-Sun,Kim, Hyeon-shup,Suh, Guk-hyun 대한수의학회 2006 大韓獸醫學會誌 Vol.46 No.1
This case was found in Holstein cow suffering from dystocia. The twin calves in uterus were dead and removed by fetotomy. Gross anatomical analysis of thoracopagus siamese calf was carried out. Two normal heads were present on two necks, however, the twins were fused in the thoracic region. There were four forelimbs and an abnormal orientation of ribs. Two separate vertebral columns along the length of the animal ended with two tails. A single pericardium lay on the midline when opening the thorax. However, there were two almost completely hearts within the pericardial sac. Two heart were joined by a common cavernous venous sinuous. There were two sets of lungs. Each twins had a separate esophagus that entered a separated stomach. A large liver was fused and connected into two duodenums. The pelvis, large intestines and urinary tracts were separated. The twins are female and have a full complement of limb.
Potassium Hydroxide 가수분해 처리법을 이용한 폐가축사체 분해시 최적 분해시간 구명
서영진(Young-Jin Seo),서동철(Dong-Cheol Seo),최익원(Ik-Won Choi),강세원(Se-Won Kang),이상규(Sang-Gyu Lee),성환후(Hwan-Hoo Sung),김태승(Tae-Seung Kim),김현구(Hyun-Goo Kim),박선화(Sun-Hwa Park),강석진(Seog-Jin Kang),조주식(Ju-Sik Cho) 한국토양비료학회 2012 한국토양비료학회 학술발표회 초록집 Vol.2012 No.6
폐가축사체의 농업적 재활용을 위한 가축사체 액상부산물의 액비화 조건 구명
서영진 ( Young Jin Seo ),서동철 ( Dong Cheol Seo ),강세원 ( Se Won Kang ),이상규 ( Sang Gyu Lee ),박주왕 ( Ju Wang Park ),최익원 ( Ik Won Choi ),성환후 ( Hwan Hoo Sung ),강석진 ( Seog Jin Kang ),조주식 ( Ju Sik Cho1 ) 한국환경농학회 2013 한국환경농학회지 Vol.32 No.4
BACKGROUND: Globally, concern about emerging infectious diseases of livestock is growing. For the disposal of the animal carcass, it is necessary to recycle the carcass into an agriculturally usable product. The objective of this study was to investigate the composting conditions of liquid by-product obtained from degradation of animal carcass. METHODS AND RESULTS: Optimum conditions of liquid fertilizer were investigated using different microorganisms, pHs, and volumes of microorganisms (Lactobacillus rhamnosus + Pichia deserticola). Based on the results from the optimum conditions, compost maturity and quality of liquid fertilizer were evaluated for 112 days. The compost maturity of liquid fertilizer were higher in the order of LP(Lactobacillus rhamnosus + Pichia deserticola) > BC(Bacillus cereus) > BS (Bacillus subtilis). The optimum condition under different volumes of LP was injection of 0.5 mL/100 mL. The compost maturity under different pHs were higher in the order of pH 7 > 5 ≥ 9 ÷ 11. The liquid by-product at 56 days after composting was completely decomposed. The concentrations of T-N, T-P and K2O in liquid fertilizer at 56 days were 0.94, 0.17 and 3.78%, respectively, and the sum of those concentrations was 4.89%. CONCLUSION(S): Liquid fertilizer of by-product using pig carcass was decomposed with optimum conditions(LP, pH 7, injection of 0.5 mL/100 mL) in 56 days after composting, and was suitable for official standard of commercial fertilizer.
한우와 젖소 신생 송아지의 말초혈액 림프구아군 특성비교
정영훈,허태영,강석진,기광석,박성재,이명식,서국현,Jung, Young-Hun,Hur, Tai-Young,Kang, Seog-Jin,Ki, Kwang-Seok,Park, Sung-Jae,Lee, Myeung-Sik,Suh, Guk-hyun 대한수의학회 2010 大韓獸醫學會誌 Vol.50 No.3
The present study was undertaken to establish reference values for the composition blood lymphocyte populations and compare forty three Hanwoo neonatal calves (KC) with twenty one Holstein calves (HC) by blood cell count and immunophynotying. The percentages of CD2+, CD4+, CD8+, CD26+, ACT2+, MHC class, MHC class II and WC1+ T cells, B cells were determined by flow cytometry. The number of lymphocyte and monocyte in HC were higher than those of KC. However, the number of neutrophils was higher in HC than KC. The proportions of CD2+, CD4+, CD8+, MHC class, and WC1+ lymphocytes remained relatively stable during the study period, while there was a moderate increase in the relative percentage of CD26+, ACT2+, MHC class II and B cell from birth to approximately 3 weeks of age. Marked differences in the relative proportions of the lymphocyte subpopulations were noted between the individual calves. The present study shows that the T-cell subpopulations are present in peripheral blood of KC at levels comparable with HC, while the MHC class II and B cell population of KC increases significantly with age. The absolute number of WBC in KC was due to the decrease of absolute number of neutrophil rather than the increase of lymphocyte. The results indicated that KC have significantly higher number of neutrophils, and proportion of MHC class II and B cell than HC.
구두발표(OC) - 농업화학 및 생태,식품분야 ; 폐가축사체의 농업적 재활용을 위한 알칼리 가수분해 처리기술 개발
서영진 ( Young Jin Seo ),서동철 ( Dong Cheol Seo ),최익원 ( Ik Won Choi ),강세원 ( Se Won Kang ),이상규 ( Sang Gyu Lee ),박주왕 ( Ju Wang Park ),강석진 ( Seog Jin Kang ),조주식 ( Ju Sik Cho ) 한국환경농학회 2013 한국환경농학회 학술대회집 Vol.2013 No.-
최근 들어 가축전염병으로 살처분된 가축에 대한 처리문제와 환경에 미치는 영향이 첨예의 관심사가 되고 있다. 특히, 2011년 구제역 발생 이후 살처분된 가축의 매몰시 침출수 누수, 인체 유해미생물 유출 및 악취 발생 등 문제점이 야기되면서 소각 및 매몰 이외의 처리가 연구되고 있지만, 우리나라 여건상 소각 및 매몰 이외에는 신속한 처리가 힘든 실정이다. 따라서 폐가축사체의 신속하고 안전한 처리가 가능하고 더 나아가 처리된 부산물을 재활용까지 할 수 있는 다각적인 활용 방안이 필요하다. 본 연구는 폐가축사체의 농업적 재활용을 위한 알칼리 가수분해 처리기술을 개발하기 위해 최적 가수분해제를 선정하였고, 가수분해제의 성상별 최적 가수분해제 주입량 및 분해시간을 조사하였다. 폐가축사체는 국립축산과학원내에서 자연사한 돼지를 사용하였으며, 알칼리 가수분해제는 KOH 및 NaOH를 사용하였다. 알칼리 가수분해제 (KOH, NaOH)를 폐돼지사체 무게의 20%되게 주입한 후 분해특성을 비교한 결과 NaOH로 가수분해한 경우 분해율은 82.8%로 KOH (81.1%)의 경우보다 약간 높았지만 분해부산물 중 질소와 칼리의 함량이 KOH로 가수분해한 경우보다 낮았다. 또한 NaOH로 가수분해시 황변현상이 발생하였고, NaOH 주입으로 인해 나트륨 함량이 매우 높아 농업적 활용성을 고려할 때 KOH를 최적 가수분해제로 선정하였다. 선정된 KOH를 이용하여 폐가축사체 가수분해를 위한 최적 KOH 주입량과 분해시간을 조사한 결과 최적 KOH 주입량은 45% KOH 액상을 폐돼지사체 무게 대비 25% 주입한 경우이었으며, 최적 분해시간은 1시간이었다.
가축사체 랜더링 부산물의 액비화를 위한 산 및 알칼리 분해제별 분해율과 분해속도 평가
서영진(Young-Jin Seo),서동철(Dong-Cheol Seo),최익원(Ik-Won Choi),강세원(Se-Won Kang),이상규(Sang-Gyu Lee),성환후(Hwan-Hoo Sung),김태승(Tae-Seung Kim),김현구(Hyun-Goo Kim),박선화(Sun-Hwa Park),강석진(Seog-Jin Kang),조주식(Ju-Sik Cho) 한국토양비료학회 2012 한국토양비료학회지 Vol.45 No.5
현행 살처분 가축사체의 처리방안 중 하나인 랜더링 처리방법을 사용하여 나온 부산물을 액비화 시키기 위해 산 및 알칼리 분해제를 사용하여 액화시켰으며, 분해제별 주입량 및 처리시간에 따른 랜더링 부산물의 분해율과 분해속도를 조사하였다. 산 및 알칼리 분해제별 주입량 및 처리시간에 따른 랜더링 부산물의 잔존량을 조사한 결과 분해제 중 가장 높은 잔존량을 나타낸 것은 HNO₃으로 다른 분해제는 10분이 경과한 후 랜더링 부산물의 잔존량이 대부분 50% 이하로 나타났다. 랜더링 부산물의 분해속도 K (hr<SUP>-1</SUP>)는 KOH의 경우 랜더링 부산물 무게 대비 25% 〉 30% 〉 20% 〉 15% 〉 10%순으로 25%를 넣어줬을 때 가장 빨리 분해가 되었다. H₂SO₄의 경우 랜더링 부산물 무게 대비 30% 〉 25% 〉 20% 〉 15% 〉 10%순으로 넣었을 때 빨리 분해되었으며, NaOH도 이와 비슷한 경향이었다. 분해제별 랜더링 부산물의 분해율은 HNO₃의 경우에는 순도가 약 61% 정도로 다른 분해제들 보다 낮아 분해율이 현저히 떨어졌으며, KOH, NaOH 및 H₂SO₄의 경우에는 랜더링 부산물을 25%와 30%를 넣었을 때 큰 차이가 없어 경제성 및 효율성을 고려하였을 때 분해제를 랜더링 부산물의 무게 대비 25%를 넣었을 경우가 가장 적합하다고 판단된다. In order to develop liquid fertilizer using rendering by-product, rates and velocities of degradation from rendering by-product using pig cadaver investigated under different amount of injection and time with degradation agents (KOH, NaOH, HNO₃ and H₂SO₄). The amount of residue by degradation agent of HNO₃ treatment method was higher than that in KOH, NaOH and H₂SO₄ treatment methods. The degradation velocities (K; hr<SUP>-1</SUP>) of rendering by-product in KOH treatment method were higher in the order of 25% (0.0309 hr<SUP>-1</SUP>) 〉 30% (0.0268 hr<SUP>-1</SUP>) 〉 20% (0.0142 hr<SUP>-1</SUP>) 〉 15% (0.0111 hr<SUP>-1</SUP>) 〉 10% (0.0102 hr<SUP>-1</SUP>) of weight of rendering by-product. In all conditions, the degradation velocity of rendering by-product using H₂SO₄ 30% of weight of rendering by-product was rapid than that for KOH, NaOH and HNO₃ treatment methods. Degradation rates of rendering by-product using NaOH were similar to that of KOH and H₂SO₄ except for HNO₃ under injecting 25% and 30% of rendering by-product weight.
허태영,정영훈,최창용,조용일,강석진,이현준,기광석,백광수,서국현,Hur, Tai-Young,Jung, Young-Hun,Choe, Chang-Yong,Cho, Yong-Il,Kang, Seog-Jin,Lee, Hyun-June,Ki, Kwang-Seok,Baek, Kwang-Soo,Suh, Guk-Hyun 대한수의학회 2013 大韓獸醫學會誌 Vol.53 No.2
The objective of this study was to investigate the calf death and analyse the causes of the mortality by based on medical records and autopsy findings during 10 years in a large dairy farm. Total of 1,361 calf born and 146 calf dead during the invested period. Mortality rate was 10.7% and showed the big difference by year-specific mortality from 2.8% (4 calves) to 19.2% (28 calves). The highest rate of mortality was 1 week age (18.5%, 27 calves) and followed by 2 week age (11.6%, 17 calves) and mortality of more old calf tended to be reduced. The death less than 4 weeks and 8 weeks of age of the entire mortality accounted for 41.1% (60/146 calves) and 70.0% (102/146 calves), respectively. Causes of calf death were digestive diseases (53.4%), respiratory diseases (17.1%), musculoskeletal disease (8.2%), and systemic disease (8.2%) in order. Specific causes of calf death was highest in enteritis (43.2%), followed by pneumonia (14.4%), sepsis (8.2%) and fractures (3.4%). Seasonally, most of calf death happened in winter (48.6%) and then fall (21.2%). This results showed that enteritis and pneumonia are the main reason of calf death but other reasons were involved in calf death on the based on autopsy finding. On going research relating factors of calf mortality is needed.
Xanthophyllomyces dendrorhous 변이군주에 의한 Carotenoids 생산 발효의 특성 연구
박기문,김영준,송민우,강석진,이재흥,Park, Ki-Moon,Kim, Young-Jun,Song, Min-Woo,Kang, Seog-Jin,Lee, Jae-Heung 한국생물공학회 2006 KSBB Journal Vol.21 No.4
Various ${\beta}$-ionone resistant mutants were isolated from the wild-type red yeast Xanthophyllomyces dendrorhous KCTC 7704. Although the growth of X. dendrorhous KCTC 7704 was strongly inhibited at 0.025 mM ${\beta}$-ionone, one of the ${\beta}$-ionone resistant mutants isolated at 0.1 mM ${\beta}$-ionone by NTG mutagenesis showed rather 70% of relative survival at 0.15 mM ${\beta}$-ionone. Fermentation kinetics study with the mutant was carried out at $20^{\circ}C$ for 4 days in 300-mL baffled flasks. The mutant yielded up to 2.3-fold higher carotenoids content(viz. $1.2{\mu}g$ of total carotenoids per mg of dry cells) compared with the wild-type strain. The production of metabolites such as organic acids could be neglected. Studies on the kinetics with various carbon substrates revealed both an increase in final dry cell mass and a higher total carotenoids content in cell mass with glucose when compared to fructose or sucrose. As a further part of study, the effect of pH on the fermentation kinetics was investigated in glucose-limited chemostat at a dilution rate of $0.04h^{-1}$. When compared to steady-state kinetic parameters obtained at pH 4.0, a significant reduction in cell concentration at pH 3.0 and a lower carotenoids content at pH 5.2 were evident. 본 연구에서는 적효모 X. dendrorhous KCTC 7704로부터 여러 ${\beta}$-ionone 내성 변이균주를 선별하였다. 야생균 KCTC 7704는 ${\beta}$-ionone 0.021 mM 농도에서 생육이 현저히 저하되었지만, NTG처리 후 ${\beta}$-ionone 0.1 mM 농도에서 선별된 변이균주는 ${\beta}$-ionone 0.15 mM에서도 70% 이상의 상대 생육율을 나타내는 매우 강한 ${\beta}$-ionone 내성을 갖고 있었다. 여러 ${\beta}$-ionone 농도에서 선별한 변이균주들을 $20^{\circ}C$에서 4일간 회분식 발효로 배양하여 그 특성을 조사하였다. 선별된 가장 우수한 변이균주는 야생균주보다 카로티노이드 생성능이 2.3배 향상(즉 $1.2{\mu}g$ of total carotenoids per mg of dry cells)되었으며 유기산과 같은 대사산물은 거의 생성하지 않았다. 여러 탄소원 들에 대한 비교 발효특성 연구 결과 과당이나 자당을 사용했을 때봐 비교하여 포도당 배지에서 최종 균체농도 및 총 카로티노이드 생성량이 많았다. 포도당이 제한되는 연속발효(dilution rate $0.04h^{-1}$) 실험을 통하여 pH의 영향을 조사한 결과 균체농도 및 총 카로티노이드 생성은 pH 4.0 조건하에서 최적인 것을 알 수 있었다.