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직응집성형법을 이용한 질화규소의 실형상 성형공정 및 성형특성
정윤성,정연길,백운규,Jung, Yun-Sung,Pagnoux, Cecile,Jung, Yeon-Gil,Paik, Un-Gyu 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.3
본 연구에서는 복잡 형상의 세라믹체를 효율적으로 성형할 수 있어 새로운 성형기법으로 부각되고 있는 직응집성형(Direct Coagulation Casing, DCC)공정기술에 관하여 콜로이드 계면화학을 이용하여 연구하였다. 높은 고형분량을 가지는 안정된 질화규소 슬립을 제조하기 위하여 분산제, 소결조제 그리고 응집제 각각이 다양한 공정변수에 미치는 영향에 대하여 평가하였다. 1.0 wt% Tetraethylammonium Hydroxide(TEAH)를 첨가하여 염기영역에서 소결조제를 포함한 안정된 51vol%의 질화규소 슬립을 제조할 수 있었다. 질화규소 슬립은 첨가된 $Al(CH_3COO)_2OH$의 온도증가에 따른 열분해를 이용하여 직응집성 유도하였다. 염기영역에서 $Al^{3+}$ 이온들이 aluminum hydroxide$(Al(OH)_3)$ 석출되면서 슬립내 $OH^-$ 농도를 감소시켜 질화규소 슬립을 직응집시켰다. In this proposed study, a new emerging shape forming technique Direct Coagulation Casting(DCC) which enables to fabricate complex-shaped ceramic parts has been investigated using colloid surface chemistry. Various process variables affected by dispersant, coagulation agent and sintering additives, have been evaluated in order to achieve highly concentrated stabilized silicon nitride suspensions. A high solid loading of 51 vol% in the dispersed silicon nitride suspension was prepared with 1.0wt% Tetraethylammonium Hydroxide (TEAH), which obtained a stable silicon nitride suspension with sintering additives $(Al_2O_3\;and\;Y_2O_3)$ in alkaline regions. The addition of hydroxyaluminium diacetate into the suspension, which decomposed at elevated temperatures, led to coagulate of a silicon nitride suspension. In a basic medium, aluminum ions precipitated to aluminum hydroxide $(Al(OH)_3)$, leading to decreased $OH^-$ concentration and, thus, coagulated suspension.
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서로 다른 배양액의 조건이 우수한 등급의 한우의 난소에서 채란한 난포란의 체외수정란의 생산에 미치는 영향
이준영 ( Jun Young Lee ),정연길 ( Yun Gil Jung ),서병부 ( Byoung Boo Seo ) 한국동물자원과학회(구 한국축산학회) 2016 축산기술과 산업 Vol.7 No.1
서로 다른 배양액의 조건이 우수한 등급의 한우의 난소에서 채란한 난포란의 체외 수정란 생산에 미치는 영향에 관하여 실험을 실시하였다. 한우 난자 수에 대한 2세포 난할율은 대조구 86.7%, IVDM 101 배양액 92.9% 그리고 IVD101 배양액 90.1%로 나타났다. 이러한 결과에서 보는 것과 같이 IVDM 101 배양액와 IVD101 배양액이 대조구 보다 높은 결과를 보였으며, IVDM 101 배양액이 IVD101 배양액 보다도 더 좋은 결과를 나타났다. 한우의 체외배양 배반포 배의 발생율은 대조구에서 12.4%, 혈청이 첨가되지 않은 IVMD 101 배양액에서 38.4% 그리고 IVD 101 배양액에서 32.4%로 대조구 보다 매우 높은 결과를 얻었다. 또한 탈출 배반포 배는 대조구, IVMD 101 배양액과 IVD 101 배양액에서의 각각 5.3%, 33.9%, 그리고 28.6%의 결과를 얻었다. 탈출 배반포 배에서는 IVMD 101배양액과 IVD 101 배양액이 대조구 보다 매우 높은 결과를 보였다. 한우 배반포 배의 평균 세포수는 TCM-199+10% FBS 배양액, IVMD 101 배양액 그리고 IVD 101 배양액에서 각각 128.3개, 165.7개 그리고 163.6개였다. 이 결과에서 보는 것과 같이 IVMD 101 배양액 그리고 IVD 101 배양액에서의 세포수가 대조군 보다 매우많았다. 수정란 이숙한 후 소의 임신율은 무혈청 배양액 (39.6%)이 혈청 첨가 배양액 (32.8%) 보다 높은 결과를 보였다. 또한 사산율은 무혈청 배양액 (4.9%)이 혈청 첨가 배양액 (13.6%) 보다 낮은 결과를 보였다. 이상의 결과를 종합해 보면 무혈청 배양액인 IVMD 101 배양액과 IVD 101 배양액이 혈청이 첨가된 배양액 보다수정란의 배 발달율, 배반포배의 세포수 그리고 임신율에 있어서 보다 우수한 결과를 나타냈으며, 특히 IVMD 101배양액이 더 좋은 결과를 보여 이 배양액을 사용하는 것이 매우 효율적이라고 판단된다.
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감액 특성 향상을 위한 하이브리드(Sb/Ca) 액식 연축전지 개발
송승윤,임태섭,김성준,정연길,양승철,Song, Seung Yun,Lim, Tae Seop,Kim, Sung Jun,Jung, Yeon-Gil,Yang, SeungCheol 한국재료학회 2022 한국재료학회지 Vol.32 No.3
One disadvantage of deep cycle flooded lead-acid batteries is increasing water loss caused by use of (+) Pb-Sb / (-) Pb-Sb alloy grid. Water loss is generated by the emission of hydrogen gas from the (-) electrode during battery charging. In this paper, we maintain cycle life aspect through the development of hybrid flooded lead-acid batteries to which a (+) Pb-Sb / (-) Pb-Ca grid is applied and deal with the improvement of water loss. The amount of water loss compared to that of the (-) Pb-Sb grid decreased when Ca was added to the (-) Pb grid. For the (-) Pb-Ca grid, it was confirmed that the time to reach 0.0 V, at which water decomposition occurs, was increased compared to that of the (-) Pb-Sb grid at the NPV (Negative Potential Voltage). In the cycle life test conducted with the BCI (Battery Council International) standard, compared to the (+) Pb-Ca grid, the (+) Pb-Sb grid increased the life cycle of the batteries and the (+) Pb-Ca grid showed an early end of life due to PbO corrosion layer generation, as determined through SEM / EDS and Tear Down analysis. In conclusion, by addition of Sb to (+) Pb grid and Ca to (-) Pb grid, we developed a hybrid flooded lead-acid battery that meets user requirements to improve water loss characteristics and preserve cycle life characteristics.
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이준영(Jun Young Lee),정연길(Yun Gil Jung),김수진(Su Jin Kim),서병부(Byoung Boo Seo) 한국동물보건학회 2023 한국동물보건학회지 Vol.2 No.4
This study seeks to compare the economic feasibility and slaughter weight of beef cattle produced based on in vitro embryo. To this end, the study compared and investigated the grade rate of carcasses based on embryo transfer and artificial insemination; slaughter weight, carcass grading results, meat quality and quantity. With respect to the meat grades of carcass based on embryo transfer and artificial insemination; 50.0% (5/10) of embryo transfer-based carcasses were graded with 1++; and 50.0% (5/10), 1+, indicating that 100% (10/10) received at least 1+ grade. On the other hand, artificial insemination-based castrated cattle had no 1++ grade while 30.0% (6/20) received 1+; 60.0% (12/20), 1; and 10.0% (2/20) 2. This finding showed that embryo-based castrated cattle had higher grades than artificial insemination-based cattle as 100% of the former were graded with 1+ or higher. This study also investigated 10 embryo transfer-based castrated cattle and 20 artificial insemination-based cattle to compare their dressed weight, back fat thickness, sirloin cross section, and meat quantity indication. As a result, the embryo transfer-based castrated cattle showed slaughter weight of 488.4kg on average, heavier by 40.6kg than 447.8kg of artificial insemination-based cattle. Back fat thickness was 15.6㎝ on average in embryo transfer-based cases, 0.9㎝ thinner than 16.5㎝ of artificial insemination-based cases. Sirloin cross section of embryo transfer-based cattle was 99.6㎠ on average, 9.8㎠ wider than 89.8㎠ of artificial insemination cases. Meat quantity indication was found 2.1% higher in the embryo transfer cases (62.8%) than artificial insemination cases (64.9%). With respect to meat quantity grade, 10.0% (2/20) of the artificial insemination cases had Grade A; 50.0% (10/20), Grade B; and 40.0% (8/20), Grade C. Embryo transfer-based cattle showed no Grade A among the 10 carcasses; Grade B in 60.0% (6/10); and Grade C in 40.0% (4/10). Comparing the results of economic profitability in terms of carcass auction prices, the embryo transfer-based castrated cattle was KRW 1,119,453 higher than artificial insemination-based castrated case. Per-head economic gain of embryo transfer-based castrated cattle was KRW 2,282,602, higher than KRW 1,567,149 of artificial insemination-based cattle. Based on the findings, this study examined embryo transfer-based castrated cattle and artificial insemination-based cattle to compare their carcass grade rate, dressed weight, grading result and economic feasibility. Consequentially, this study found that in vitro embryo transfer-based castrated cattle had higher meat quality grade, slaughter weight and economic feasibility. Based on information on pedigree, attribute, and carcass data of individual with blood tie which indicate such meat productivity; high grade cattle genetic resources would be secured to contribute to quality meat production. Subsequent study will need to research industrialization based on in vitro embryo transfer.
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