• Journal of the Optical Society of Korea
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• v.14 no.4
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• pp.316-320
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• 2010

We report an application of full-field optical coherence tomography (FF-OCT) for identifying counterfeit bank notes. The depth-resolved imaging capability of FF-OCT was used for tomographic identification of superficially-identical objects. By retrieving the internal structures of the security feature (cash hologram) of an original banknote, we could demonstrate the feasibility of FF-OCT to identify counterfeit money. The FF-OCT images showed that the hologram consisted of micron scale multi-coated layers including an air gap. Therefore, it is expected that FF-OCT has potential as a new non-invasive tool to discern imitation of currency, and it would find applications in a wide field of counterfeit sciences.

• Korean Journal of Animal Reproduction
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• v.20 no.3
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• pp.289-297
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• 1996

This study was conducted to investigate the effects of maturaton medium and porcine follicular fluid on in vitro maturation of porcine follicular oocytes. The results obtained are as follows; 1. When the oocytes were cultured for 42 hours, the maturation rate was significantly (P<0.05) higher in TCM-HEPES(75.5%) than Ham's F-10(60.9%) and mKRB(60.7%) medium. The optimal medium for the maturation of porcine oocytes in vitro was the TCM-HEPES medium. 2. When the oocytes were cultured for 42 hours in TCM-HEPES medium with 10, 20 and 30% of porcine follicular fluid(pFF), the maturation rates of porcine oocytes were 69.1, 65.6 and 63.3%, respectively. The maturation rate(51.4%) of oocytes cultured without pFF was significantly(P<0.05) lower than that of oocytes cultured with pFF. 3. The maturation rates of porcine oocytes cultured for 42 hours in TCM-HEPEs medium with 3 different porcine follicular fluid treatments were 68.6%(centrifused), 72.3%(filtered) and 73.1%(heat treated), respectively. The maturation rate(49.4%) of control group without pFF treatment was significantly(P<0.05) lower than that of oocytes cultured with pFF treatment.

• Molecules and Cells
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• v.44 no.2
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• pp.116-125
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• 2021

Cardiovascular diseases (CVDs) are the most common cause of death in patients with nonalcoholic fatty liver disease (NAFLD) and dyslipidemia is considered at least partially responsible for the increased CVD risk in NAFLD patients. The aim of the present study is to understand how hepatic de novo lipogenesis influences hepatic cholesterol content as well as its effects on the plasma lipid levels. Hepatic lipogenesis was induced in mice by feeding a fat-free/high-sucrose (FF/HS) diet and the metabolic pathways associated with cholesterol were then analyzed. Both liver triglyceride and cholesterol contents were significantly increased in mice fed an FF/HS diet. Activation of fatty acid synthesis driven by the activation of sterol regulatory element binding protein (SREBP)-1c resulted in the increased liver triglycerides. The augmented cholesterol content in the liver could not be explained by an increased cholesterol synthesis, which was decreased by the FF/HS diet. HMG-CoA reductase protein level was decreased in mice fed an FF/HS diet. We found that the liver retained more cholesterol through a reduced excretion of bile acids, a reduced fecal cholesterol excretion, and an increased cholesterol uptake from plasma lipoproteins. Very low-density lipoproteintriglyceride and -cholesterol secretion were increased in mice fed an FF/HS diet, which led to hypertriglyceridemia and hypercholesterolemia in Ldlr-/- mice, a model that exhibits a more human like lipoprotein profile. These findings suggest that dietary cholesterol intake and cholesterol synthesis rates cannot only explain the hypercholesterolemia associated with NAFLD, and that the control of fatty acid synthesis should be considered for the management of dyslipidemia.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.151-153
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• 2023

구별자 공격은 암호 알고리즘이 특정 확률로 특정 차분 특성을 만족한다는 사실을 활용하여 랜덤 데이터들로부터 암호 데이터를 구별해내는 작업이며, 데이터에 대한 확률적인 예측을 수행하는 딥러닝 기술은 이에 대한 좋은 솔루션이 될 수 있다. 최근 딥러닝 기술이 발달함에 따라 실제로 신경망 구별자에 대한 많은 연구들이 진행되고 있지만, 형태 보존 암호인 FF3에 대한 딥러닝 기반의 구별자 공격에 대한 연구는 아직 수행되지 않았다. 본 논문에서는 형태 보존암호인 FF3에 대한 딥러닝 기반의 신경망 구별자를 최초로 제안하였다. 실험 결과, 0x08 (입력 차분)에 대해서는 숫자 도메인에서 8 라운드까지0.98 이상의 정확도를 달성하였으며, 소문자 도메인에서는 2라운드까지 구별이 가능하였다. 향후에는 또 다른 형태 보존 암호에 대한 신경망 구별자와 더 큰 도메인 및 높은 라운드에서도 동작 가능한 FF3 신경망 구별자를 구현할 예정이다.

• Journal of Embryo Transfer
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• v.21 no.4
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• pp.315-322
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• 2006

This study was performed to investigate the physiological effects of bovine follicular fluid (bFF) or anti-inhibin serum (AI) on follicular development in Hanwoo. Saline (0.95%), bFF or AI (total of 40 ml) were administered into the jugular vein in 9 Hanwoo cows. The plasma inhibin, estradiol-17 $\beta$ (E2), and progesterone (P4) levels were measured using RIA or ELISA kit and the number of ovarian follicles was observed by ultrasonography at 72 hr after ovulation. The plasma inhibin level in bFF treatment group was significantly increased and maintained higher level from 102 hr after ovulation compared to that of saline and AI groups (p<0.05). In plasma E2 level, AI treatment group showed significantly higher level from 36 hr to 108 hr after ovulation than that of saline and bFF groups (p<0.05). After that it showed decreasing tendency. The plasma P4 level was increased in control and AI treatment groups at 68 hr after ovulation. However, it was maintained significantly lower level in bFF group from 84 hr to 180 hr compared to that of saline and AI group (p<0.05). As a result of ultrasonography at 72 hr after ovulation, higher number of follicles was shown in AI treatment group compared to bFF groups, although the difference was not statistically significant. Taken together, it can be postulated that a treatment of synthesized AI inhibits the secretion of inhibin, stimulates FSH secretion inhibited by inhibin, and induces follicular development and estrogen secretion. According to these results, a development of ovarian follicle immediately after ovulation is associated closely with inhibin in Hanwoo heifers.

• Journal of Nutrition and Health
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• v.26 no.6
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• pp.783-792
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• 1993

This study examined the difference in growth rate between Korean breast-fed(BF) and formula-fed(FF) infants(n=31) at 1, 2 and 3 months postpartum. The results indicated that the growth rate was comparable between groups, but that of the BF infants tended to be slow during the first three months. The intakes of energy, protein and lipid except lactose of the FF infants were greater than those of the BF infants, however the difference in growth rate did not correlate to these variables. But these results suggest that the availability of nutrients might be different between the BF infants and the FF infants.

• Journal of the korean Society of Automotive Engineers
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• v.9 no.5
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• pp.25-33
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• 1987

최근 저연비 및 차실내거주성향상의 관점에서 볼 때 소형차의 대부분이 FR에서 FF방식으로 바뀌며 차체의 경량화가 적극적으로 추진되고 있다. 본문에서는 수평식엔진 FF차(4기통, 4cycle엔진)에 관해 공회전시 진동과 급가속시의 쇼크진동 (shock vibration)을 중심으로 차체진동을 시험, 해석하고 이에 관련한 각각의 요소들을 총괄적으로 검토함으로써 차체나 엔진지지부의 합리적인 설계를 하는데 필요한 것들을 검토하였다.

• Journal of Nutrition and Health
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• v.29 no.1
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• pp.77-88
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• 1996

This study was to investigate the nutrient intake of infants according to the 3 feeding groups which are as follows : breast-feeding(BF), formula-feeding(FF), mixed-feeding(MF) infants. Intake was compared between these 3 groups and present Korean RDA at 2month of age. The energy and the nutrient intake in the FF infants were significantly higher than in the BF infants and MF infants(p<0.05). Unfortunately, the energy and nutrient intake in all groups still do not meet RDA, excluding iron intake in FF infants. It might be suggested that follow-up study is needed to inspect whether the significant lower intakes of energy and nutrients in BF infants than in FF infants can bring about some significant effects on the growth of the infants.

• Journal of the Korean Chemical Society
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• v.64 no.2
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• pp.61-66
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• 2020

In this study, we investigate the structural and electronic properties of copper oxide clusters, Cu_nO_n (n = 9 - 15). To find the lowest energy structures of copper oxide clusters, we use ReaxFF and density functional theory calculations. We calculate many initial copper oxide clusters using ReaxFF quickly. Then we calculate the lowest energy structures of copper oxide clusters using B3LYP/LANL2DZ model chemistry. We examine the atomization energies per atom, average bond angles, Bader charges, ionization potentials, and electronic affinities of copper oxide clusters. In addition, the second difference in energies is investigated for relative energies of copper oxide clusters.

• Journal of the Korea Computer Industry Society
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• v.5 no.2
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• pp.293-300
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• 2004

In this paper, we devise both methods supporting interactive VCR-like functions for MPEG stream and minimizing the storage space. Specifically, we proposed both methods to efficiently stripe MPEG stream into multiple disks, and an access strategy to retrieve the distributed streams over the disks. To accurately locate the streams to be referred to, we introduce a table indexing the location. When client request Fast Forward(FF)/Fast Backward(FB), VOD(Video on Demand) server refer to this index table supporting FF/FB functions. Experimental result shows that the proposed method can reduce the additional storage space needed when VOD server services FF/FB functions.