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Lee, Yun-Ha,Choi, Young-Wook,Park, Jaejung,Park, Myeong-Sam,Go, Seung-Yong,Kang, Hak-Hee,Paik, Ungyu,Sohn, Daewon WILEY-VCH Verlag 2007 Macromolecular symposia Vol.249 No.1
<P>The flocculation of strong polyelectrolyte, poly(styrene sulfonate), (PSS) with ternary amine-functionalized polystyrene particles was investigated by dynamic light scattering (DLS). Ternary amine particles that show stable dispersion in pH 10 undergo different flocculation in a low pH conditions. In pH 3 condition, particles present fast aggregation and irreversible process (coagulation) but in pH 7 solution particles show slow aggregation and reversible process (depletion-induced flocculation). By adding strong polyelectrolyte, aggregation rapidly removed in pH 7 but retained some concentration (about 5 mg/L) in pH 3. The homogeneity exponent λ to characterize the different flocculation behaviors presents not only difference as a function of pH but also distinction as a function of concentration in pH 3.</P>
Change of Blood Composition and Expression Genes by the High Fat Diet in Mice
JunKoo Yi,Jaejung Ha,Dongyep Oh,Myoung Ok Kim 한국동물생명공학회(구 한국동물번식학회) 2017 Reproductive & Developmental Biology(Supplement) Vol.41 No.2
Obesity is a risk factor for various diseases, including cardiovascular disease, diabetes, renal disease, hypertension, cancer, and neural disease. Adipose tissue in animals is important for the mobilization of lipids, milk production, deposition of fat in different depots, and muscle and meat production. Understanding the genetic and physiological causes of metabolic disease is a priority in biomedical genome research. In this study, we examined several variables in mice fed a high-fat diet, including serum composition, body weight, total calorie intake, and differentially ex\-pressed genes. Body weight and blood glucose levels were not significantly different between animals fed high-fat and normal diets. However, high-fat diet groups showed reduced calorie and food intakes. Levels of sodium, ionized calcium, glucose, hematocrit, hemoglobin, pH, PCO2, PO2, TCO2+, HCO3+, base excess, and SO2 in the blood were not significantly different between mice fed high-fat and normal diets. Serum potassium concentration, however, was lower in mice a high-fat diet. Differentially expressed genes were also compared between the two groups. The purpose of this study was to discover new genes as a result of annealing control primer (ACP) PCR using 20 random primers. Five down regulated genes were identified and three of others were up-regulated by high-fat diet. Known genes were excluded from this result. In addition, the relationships among candidate genes and high-fat diet should be investigated according to potassium concentration in the blood. In conclusion, mice fed normal and high-fat diets showed no significant difference in body weight, whereas high-fat diet led to changes in blood composition and differential expression of several genes. These findings may provide a better understanding of the mechanisms underlying the association between obesity and metabolic diseases.
Effect of Egg Yolk Combination on Freezing thawed Semen Function in Korean Hanwoo Bull
JunKoo Yi,Jaejung Ha,Dongyep Oh,Zae Young Ryoo 한국동물생명공학회(구 한국동물번식학회) 2017 발생공학 국제심포지엄 및 학술대회 Vol.2017 No.10
Since the first report of the successful preservation of sperm, cryopreservation has been applied as a routine technique for processing bovine sperm in artificial insemination (AI), and numerous studies have been carried out to evaluate fundamental biological properties. Although fertility with frozen–thawed bull semen was generally acceptable for AI, the cryopreservation techniques at the time still resulted in the loss of 40 ~50% of viable sperm during the freezing–thawing process with little improvement over the last several decades. Cold shock, osmotic stress, ice crystal formation or oxidative damage were the main sources of sperm cryoinjury, and finally caused the loss of sperm viability and fertility. This study was designed to compare fresh and insemination egg yolk in an extender for cryopreservation of Hanwoo bull semen. Sperm motility, plasma membrane integrity and viability were assessed at different stages of cryopreservation (post-dilution, pre-freezing and post-thawing). Sperm plasma membrane integrity remained similar at all the stages of cryopreservation. Sperm motility and viability were significantly higher after thawing in the extender containing insemination egg yolk. In conclusion, insemination egg yolk may be used in an extender for the cryopreservation of Hanwoo bull spermatozoa.
Junkoo Yi,Jinyeon Park,Jaejung Ha,Daejung Yu,Woo-Sung Kwon,Daehyun Kim 한국동물생명공학회(구 한국수정란이식학회) 2023 한국동물생명공학회지 Vol.38 No.4
Background: Estrus in cows can be detected through vaginal electrical resistance or conductivity. However, there are no studies measuring vaginal electrical resistance in Hanwoo cows. This study aims to measure the vaginal electrical resistance value in Hanwoo cows and compare it with estrus and ovulation. Methods: Vaginal electrical resistance values of 73 Hanwoo cows were measured before and after estrus at the Gyeongsangbuk-do Livestock Research Institute. Measurements were taken on days -6, -3, -2, -1, 0, 1, 2, 3, and 6 of artificial insemination. Large follicles and ovulation were confirmed using transvaginal ultrasonography. Results: The vaginal electrical resistance averaged 225.6 ± 6.3 Ω days before the artificial insemination date, decreasing until the day of artificial insemination. The average vaginal electrical resistance was 163.7 ± 4.6 Ω on the date of artificial insemination, and 188.8 ± 4.3 Ω one day after artificial insemination, when large follicles were observed. In addition, on the 6th day after artificial insemination, the vaginal electrical resistance averaged 231.4 ± 5.5, which was similar to the 6th day before artificial insemination (222.5 ± 6.3). Transvaginal ultrasonography showed that most of the cows ovulated one day after artificial insemination. Conclusions: The accuracy of estrus is high if the vaginal electrical resistance is measured for cows with confirmed estrus, making is a potentially useful for determining the timing of artificial insemination.
마찰용접 된 SM45C 요크와 알루미늄 합금 7075-T6 파이프의 비틀림 특성연구
유미화(Mihwa Yu),하현수(Hyunsu Ha),김연직(Yonjig Kim),김철생(Cheolsang kim),홍동표(Dongpyo Hong),이재정(Jaejung Lee) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
자동차의 프로펠러샤프트 경량화를 위하여 SM45C로 만들어진 요크와 알루미늄 합금 7075-T6로 만들어진 파이프를 마찰용접하여 비틀림 토크를 알아보았다. 16개의 조건으로 마찰용접 된 시험편 중에 6개의 시험편에서 비틀림 토크 값을 얻을 수 있었다. 스핀들의 속도가 1800rpm, 마찰압력 60㎫, 업셋압력 80㎫, 마찰시간 0.5초의 시험편의 비틀림 토크값은 286.6㎏fㆍm 였으며 공인시험기준인 300㎏fㆍm에는 미치지 못하는 수준이다. 충격이나 비틀림 발생시 접합면에서 파손이 일어날 것으로 예측되며 시험기준을 만족하기 위한 새로운 마찰용접의 조건 확립이 필요하다.
Application of the Butterfly Diagram for Business and e-Commerce Innovation Cases
Jung-Suk Hyun,Chan-Jung Park,Jaejung Kang,Hwanho Ha 한국인터넷전자상거래학회 2014 인터넷전자상거래연구 Vol.14 No.5
Innovative cases have something in common that they solved contradiction relations hidden in given problems. General Motor`s Installment Financing, Diffie-and Hellman`s public key cryptography, Toyota`s Just-In-Time production system, and SK Telecom`s Gifticon are the examples. In order to solve problems, it is important to represent the problem with an appropriate notation. However, we hardly found the systematic representation method for the contradiction problems belong to business and e-Commerce innovations. When we confront a difficult problem to solve, if we can figure out the problem structure and the problem type, then we can easily solve the problem because they help to reduce the problem space. In this research, we present the Butterfly Diagram for contradiction problem solving to draw innovative problem solution strategies by analyzing the trade-off relations and the contradiction relations hidden in dilemmas. In addition, we proposed a few implications by applying the Butterfly Diagram for contradiction problem solving to the business and e-Commerce innovative cases.