원형톱에 의한 속성수 절단 소요 동력에 관한 연구

최윤성 ( Yun Sung Choi ),김대현 ( Dae Hyun Kim ),오재헌 ( Jae Heun Oh1 ) 한국임학회 2014 산림과학 공동학술대회 논문집 Vol.2014 No.-

본 연구에서는, 단벌기 바이오매스 생산림(Short rotation forest, SRF)에 식재되어 있는 속성수인 이태리포플러( Populus euramericana)을 이용하여 수확 시 소요되는 동력을 측정하여 수확기계동력원을 선정하기 위한 기초자료를 제공하기 위하여 수행되었다. 실험 수준은 밀기속도(0.41, 1.25,2.5 m/s) 3수준, 절단속도(800, 1,000, 1,200 rpm) 3수준, 직경(50, 70, 90, 110, 130 ㎜) 5수준으로 선정하였다. 실험결과, 밀기속도에 따른 최대토크는 0.41 m/s 일 때 30.4 N-m, 최소동력은 191.37 W로나타났다. 밀기속도 1.25 m/s 일 때 최대토크와 최소동력은 각각 30.1 N-m, 194.88 W, 2.5 m/s 일때 최대토크와 최소동력은 각각 31.9 N-m, 204.10 W로 나타났다. 또한 밀기속도 0.41 m/s 보다 2.5m/s 일 때 최대토크는 각각 4.8, 10, 7.2%, 최소동력은 6.8, 10, 11.8%가 증가하였으며, 밀기속도 0.41m/s 인 경우보다 6.8% 많은 동력을 필요로 하는 것으로 나타났다. 따라서, 실험결과를 바탕으로 측정된 소요 동력 기준으로 수확기계의 동력원을 선정할 수 있을 것으로 판단된다. In this study, Italy poplar( Populus euramericana) was selected for test specimen to measure cutting power when it harvested. Three levels of feed rate (0.41, 1.25, 2.5 m/s), three levels of sawing speed (800, 1,000, 1,200 rpm), and five levels of stem diameter (50, 70, 90, 110, 130 ㎜) were used as test variables. As results, the maximum torque, 30.4 N-m for feed rate 0.41 m/s, the minimum power, 191.37 W. The maximum torque and power, such as 30.1 N-m, 191.37 W for feed rate 1.25 m/s. The maximum torque and power, such as 31.9 N-m, 204.10 W for feed rate 2.5 m/s. Also, feed rate 0.41 m/s than feed rate 1.25 m/s, the maximum torque such as 4.8, 10, 7.2%, minimum power 6.8, 10, 11.8% increased. The feed rate 0.41 m/s than 6.7% many power to required. Using the results of this experiment as the base, The measured power source of the power requirements by the harvesting machine is determined to be able to select.

석탄회를 이용한 석탄광산 폐기물의 안정화 효율성 평가

오세진(Se-Jin Oh),김성철(Sung-Chul Kim),고주인(Ju-In Ko),이진수(Jin-Soo Lee),양재의(Jae E. Yang) 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.6

본 연구는 다량의 중금속을 함유하는 폐석탄 광산에 적치된 폐석으로부터 발생하는 침출수의 안정화를 위해 석탄회를 안정화제로서의 적용성을 평가하는데 목적이 있다. 석탄폐석에 석탄회를 적용하여 컬럼시험을 수행한 결과는 다음과 같다. 1) 석탄회의 pH는 비산재와 바닥재가 각각 11.1, 9.7의 강알칼리성을 갖는 것으로 나타나 강산성 조건의 폐석 (pH 3.5)를 교정하였으며 유기물을 비롯하여 식물생장에 필요한 영양소인 인산, 칼슘 등을 함유하는 것으로 나타나 폐석과 혼합할 경우 비옥도가 개선될 수 있을 것으로 판단된다. 2) 폐석만을 충진한 컬럼에서 발생하는 침출수의 pH는 3.5~4.0의 수준을 시험기간 동안 지속적으로 유지하는 것으로 나타나지만, 석탄회의 처리량에 따라 40% (pH 5.0~6.0) 〉 20% (pH 4.5)로 나타나고, 동일 처리량 (40%)의 처리방법에 따른 효율성은 완전혼합 (pH& & 5.0~6.0) 방법이 층위처리 (pH 4.0~4.5)에 비해 pH 상승효과가 높은 것으로 조사되었다. 3) 침출수의 Ca과 Mg의 함량은 4 pore volume까지 빠르게 용탈되다 그 이후부터 안정화 되었으며 석탄회에서 용탈된 Ca과 Mg의 영향으로 폐석에 함유되었던 Cu, Pb, As, 및 Al 등이 탄산이온 (CO₃<SUP>2-</SUP>) 또는 수산화이온 (OH-)과 불용성 화합물을 형성하여 안정화 되는 것으로 사료된다. 4) 철의 용존함유량에 대한 분석결과 석탄회 처리구의 용존량이 석탄회를 40% 층위처리한 처리구를 제외하고 대조구에 비해 약 8-74% 정도 감소하는 것으로 조사 되었다. 5) 석탄회를 이용한 폐석의 중화 및 철의 용존량 감소 효율성을 평가한 결과 폐석의 중화 효율성은 석탄회를 40% 완전혼합한 경우 가장 높았으며 철의 용존량 감소 효율성은 석탄회를 20% 완전혼합한 경우가 가장 좋은 것으로 조사되었다. 따라서 석탄회를 이용하여 현장에서 폐석을 처리할 경우 약 20-40%의 석탄회를 처리해야 높은 효율성을 얻을 수 있을것으로 사료된다. In this study, coal combustion ash (CCA) was evaluated for its stabilization effect on acidic mine waste with column experiment. Total of six treatments were installed depending on mixing ratio between coal wastes and CCA (0, 20, 40%) and mixing method (completely mixing and layered). Artificial acidic rain (pH 5.6) was used for feeding solution with flow rate of 0.05 mL min<SUP>-1</SUP>. Result showed that higher pH of leachate was observed as more CCA was mixed. The highest pH in leachate was measured when 40% of CCA was mixed with coal waste (pH of 5.8). Also, complete mixing with CCA and coal waste was more effective to increase the pH of leachate than layered treatment. Regarding the reduction of soluble Fe amount, the highest efficiency (78%) was observed when 20% of coal ash was completely mixed with mine waste. Based on those result, optimum mixing ratio of coal ash with mine waste can be ranged 20-40% depending on environmental circumstances in the field.

수중 유기물처리를 위한 광펜톤반응의 최적조건 도출

오태협,이한욱,박성직,박재우,Oh, Tae Hyup,Lee, Hanuk,Park, Sung Jik,Park, Jae-Woo 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.1

Fenton is the reaction using the OH· radicals generating by interaction between hydrogen peroxide and Fe²⁺ which can oxidize the contaminants. Fe²⁺ ions are oxidized to Fe³⁺ ions by reaction with H₂O₂ and formed OH· radicals. UV-Fenton process includes the additional reaction that generates the OH· radicals by photodegradation of H₂O₂. In methylorange (MO) decolourization experiment with UV-Fenton, optimal Fe²⁺: H₂O₂ ratio was obtained at 1 : 10. Based on the obtained condition (H₂O₂= 10mM, Fe²⁺ = 1 mM) with/without UV-fenton experiment was carried out. Removal efficiency and sludge production were measured at 30 min. The case of w/o UV irradiation and only H₂O₂ was hardly treated and only Fe²⁺ showed 65% removal owing to coagulation. When UV-Fenton process in optimal ratio (Fe²⁺: H₂O₂ = 1 : 10), UV irradiation showed better removal efficiency than of w/o UV irradiation. Also, MO decolourization was a function of the hydrogen peroxide concentration (x₁), Fe²⁺:H₂O₂ ratio (x₂), and numbers of UV lamp (x₃) from the application of the response surface methodology. Statistical results showed the order of significance of the independent variables to be hydrogen peroxide concentration > numbers of UV l amp > Fe²⁺: H₂O₂ ratio.

자가면역 췌장염의 동반증상 없이 발생한 IgG4 연관 경화성 담관염

천송욱 ( Song Wook Chun ),최자성 ( Ja Sung Choi ),강버들 ( Beo Deul Kang ),김유진 ( Yu Jin Kim ),한기준 ( Ki Jun Han ),조현근 ( Hyeon Geun Cho ),오화은 ( Hwa Eun Oh1 ),조재희 ( Jae Hee Cho ) 대한소화기학회 2013 대한소화기학회지 Vol.62 No.1

IgG4-related systemic diseases are characterized by a diffuse or mass forming inflammatory reaction rich in lymphocytes and IgG4-positive plasma cells (lymphoplasmacytic infiltration), fibrosclerosis of variable organs and obliterative phlebitis. They usually involve various organs including the pancreas, bile duct, gallbladder, salivary gland, retroperitoneum, kidney, lung, and prostate. However, most of them are accompanied by autoimmune pancreatitis, and good response to steroid treatment is one of the hallmarks of this disease. We report a case of an 67-year-old man with IgG4 associated sclerosing cholangitis, who was diagnosed by endoscopic retrograde cholangiopancreatography and successfully treated with steroid therapy. (Korean J Gastroenterol 2013; 62:69-74)

국내 시판 고령친화식품의 품질특성

장미순 ( Mi-soon Jang ),김풍호 ( Poong-ho Kim ),오재영 ( Jae-young Oh ),박선영 ( Sun Young Park ),김예율 ( Ye Youl Kim ),강상인 ( Sang In Kang ),김진수 ( Jin-soo Kim ) 한국수산과학회(구 한국수산학회) 2021 한국수산과학회지 Vol.54 No.3

As the aging population of the world grows, senior-friendly foods are becoming increasingly popular. In this study, the quality characteristics of domestic commercial senior-friendly foods were investigated and compared to the standard specifications of the Food Code and KS H4897. Herein, 18 samples of domestic commercial senior-friendly foods were utilized to analyze their appearance, physical properties (hardness and viscosity), nutritional value (protein, vitamin, mineral and dietary fiber), digestion rate, and hygiene indicator bacteria. When compared to the hardness standards of the Food Code all 18 samples were found to be satisfactory; however, when compared to the nutritional standard (at least three types of nutrients must be above the minimum), only five products, HG-7, DW-1, PS-1, OH-1 and OH-2, were found to be satisfactory. In addition, when the 18 samples were compared to the Korean Industrial Standard (2020), all 18 products were found to be satisfactory for physical properties and hygiene standards; furthermore, all samples, excluding HB-2, were suitable for nutritional standards (at least one type of nutrient must be above the standard).

중금속 오염 논토양에서 카드뮴의 부동화와 식물이용성에 대한 석회 시용 효과

홍창오 ( Chang Oh Hong ),김용균 ( Yong Gyun Kim ),이상몽 ( Sang Mong Lee ),박현철 ( Hyean Cheal Park ),김근기 ( Keun Ki Kim ),손홍주 ( Hong Joo Son ),조재환 ( Jae Hwan Cho ),김필주 ( Pil Joo Kim ) 한국환경농학회 2013 한국환경농학회지 Vol.32 No.1

석회시용에 의한 카드뮴의 부동화와 식물이용성 저감효과를 구명하기 위해 우리나라의 대표적인 석회비료인 소석회를 선정하여 소석회에 의한 논토양 내 카드뮴의 부동화 기작과 벼의 카드뮴 흡수특성을 조사하였다. 소석회는 토양의 pH와 음하전도를 증대시켜 카드뮴의 흡착을 증대시키는 것으로 조사되었다. 소석회의 처리량을 증가시킴에 따라 식물이 이용하기 쉬운 형태인 유효태 카드뮴과 치환성 및 carbonate 결합태 카드뮴의 함량이 유의적으로 감소하였다. 소석회를 8,000 mg/kg 과량으로 시용하였을 때 CdCO3 형태로의 침전이 가능하였을 것으로 판단되나 8,000 mg/kg 이하로 처리하였을 때 CdCO3나 Cd(OH)2 형태로의 침전은 없었던 것으로 조사되었다. 또한 토양의 pH와 음하전도는 유효태 카드뮴과치환성 및 carbonate 결합태 카드뮴의 함량과 유의한 부의상관관계를 나타내었다. 따라서 소석회에 의한 토양 내 카드뮴의 부동화는 CdCO3나 Cd(OH)2 형태로의 침전형성에 의한 것이 아니라 pH와 음하전도의 증대에 기인된 카드뮴 이온의 흡착에 의한 것으로 판단되어 졌다. 논토양의 현장조건에서 소석회의 시용에 의한 벼의 카드뮴 흡수농도 저감효과를 시험한 결과, 소석회의 시용량을 증가시킴에 따라 벼의 카드뮴 흡수농도는 유의적으로 감소하는 결과를 나타내었다. Research Article : BACKGROUND : Many studies associated with cadmium (Cd) immobilization using lime fertilizer have been conducted for several decades. However, these studies did not suggest exact mechanism of Cd immobilization using lime fertilizer and evaluated effect of lime fertilizer on Cd phytoavailability in rice paddy soil under field condition. METHODS AND RESULTS: This study was conducted to determine exact mechanism of Cd immobilization using lime fertilizer and evaluate liming effect on Cd uptake of rice in contaminated paddy soil. Ca(OH)2 was mixed with Cd contaminated arable soil at rates corresponding to 0, 1,000, 2,000, 4,000, and 8,000 mg/kg. The limed soil was moistened to paddy soil condition, and incubated at 25℃ for 4 weeks. NH4OAc extractable Cd concentration in soil decreased significantly with increasing Ca(OH)2 rate, since Ca(OH)2 markedly increased net negative charge of soil by pH increase, and decreased bioavailable Cd fractions (F1; exchangeable + acidic and reducible Cd fraction). Calculated solubility diagram indicated that Cd solubility was controlled by soil-Cd. NH4OAc extractable Cd and F1 concentration were negatively related to soil pH and negative charge. Ca(OH)2 was applied at rates 0, 2, 4, and 8 Mg/ha and then cultivated rice in the paddy soil under field condition. Cadmium concentrations in grain, straw, and root of rice plant decreased significantly with increasing application rate of Ca(OH)2. CONCLUSION(S): Alleviation of Cd phytoavailability with Ca(OH)2 can be attributed primarily to Cd immobilization due to the increase in soil pH and negative charge rather than precipitation of Cd(OH)2 or CdCO3, and therefore, Ca(OH)2 is effective for reducing Cd phytoavailability of rice in paddy soil.

Recycling of limestone fines using Ca(OH)₂- and Ba(OH)₂-activated slag systems for eco-friendly concrete brick production

Yum, Woo Sung,Jeong, Yeonung,Song, Heamin,Oh, Jae Eun Elsevier 2018 Construction and Building Materials Vol.185 No.-

<P><B>Abstract</B></P> <P>This study explored the possibility of using limestone fines (LF) as a supplementary material in activated slag binder systems using two types of activators (i.e., 10 wt% of Ca(OH)<SUB>2</SUB> or 10 wt% of Ba(OH)<SUB>2</SUB>) and investigated the interactions of the activators with LF in each binder system through strength testing, powder X-ray diffraction, thermogravimetry, and mercury intrusion porosimetry. Using these binders, concrete brick samples containing LF were also made and examined for possible industrial applications. Although the influences of the LF addition on the strength, dissolution degree of the slag, reaction products, and pore-size distribution depended on the type and dosage of the activator, the addition was generally advantageous for all these aspects in both types of activations. The concrete brick made of 20 wt% LF using the Ba(OH)<SUB>2</SUB> activation fulfilled the Korean standard requirements of strength and water absorption for concrete bricks, and it also satisfied the criteria of the leaching test for possible toxic elements.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Limestone fines (LF) was studied as a supplementary material in activated slags. </LI> <LI> Main activators for slag were Ca(OH)<SUB>2</SUB> or Ba(OH)<SUB>2</SUB>. </LI> <LI> At early ages, the use of LF significantly improved strength in both activations. </LI> <LI> The use of LF significantly changed reaction products of Ba(OH)<SUB>2</SUB> activation. </LI> <LI> However, the use LF did not alter reaction products of Ca(OH)<SUB>2</SUB> activation. </LI> </UL> </P>

Pioglitazone Improves Oocyte Maturation and Subsequent Developmental Competence of Porcine Embryos

Sang-Gi Jeong,Seung-Eun Lee,Won-Jae Kim,Jae-Wook Yoon,Chan-Oh Park,Hyo-Jin Park,Dong-Yong Hong,Eun-Young Kim,Se-Pill Park 한국동물생명공학회(구 한국동물번식학회) 2018 발생공학 국제심포지엄 및 학술대회 Vol.2018 No.06

The optimization of culture condition is both basic and important for improving oocyte maturation, subsequent development of preimplantation embryo, and further implantation. This study performed to confirm effect of pioglitazone (PIO) treatment directly on porcine oocyte during in vitro maturation, further development of embryo. Immature oocytes were cultured in IVM medium, containing 0, 0.01, 0.1, 1, and 10 μM pioglitazone (0, 0.01, 0.1, 1, and 10 PIO, respectively) for 44 h. Although both oocyte survival and polar body emission did not significantly differ between the control and PIO-treated groups, percentage of normal spindle formation and chromosome alignment was increased in the 1 PIO-treated group than in the control group (control, 60.9±8.2%; and 1 PIO, 81.5±5.9%, p<0.1). Level of GSH was significantly increased in 1 PIO-treated group than in the control group (control, 100.0±5.0%; and 1 PIO, 119.8±5.2%, p<0.05), while the level of ROS was not differ in all groups. The rate of blastocyst was significantly higher in the 1 PIO-treated group than in the control at day 6 (control, 29.6±2.5%; and 1 PIO, 37.9±2.3%, p<0.05) and 7 (control, 35.1±1.6%; and 1 PIO, 41.8±2.7%, p<0.05), respectively. These results indicated that PIO treatment during IVM showing beneficial effects on oocyte and embryonic development. Pioglitazone will contribute to enhancing efficiency of in vitro production.

Construction of PMMA water equivalent phantom for the measurement of absorbed dose to water in Gamma Knife

Jae Pil Chung,Yeong Min Sung,Se Woon Oh,Suck-Ho Hah,Chul Young Yi,Hyun Moon Kim,Kook Jin Chun 대한방사선방어학회 2014 대한방사선방어학회 학술발표회 논문요약집 Vol.2014 No.11

Early neuroprotective effect with lack of long-term cell replacement effect on experimental stroke after intra-arterial transplantation of adipose-derived mesenchymal stromal cells

Oh, Seung-Hun,Choi, Chunggab,Chang, Da-Jeong,Shin, Dong-Ah,Lee, Nayeon,Jeon, Iksoo,Sung, Jong-Hyuk,Lee, Hyunseung,Hong, Kwan-Soo,Ko, Jung Jae,Song, Jihwan Elsevier 2015 cytotherapy Vol.17 No.8

<P>Adipose-derived mesenchymal stromal cells (AD-MSCs) have high proliferative capacity and ability to secrete trophic factors. Although intra-arterial (IA) transplantation of stem cells induces efficient engraftment to the host brain, it is unclear whether engrafted cells exert their long-term therapeutic effects through a bystander mechanism or a cell replacement mechanism.</P>