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모델 시스템에서 계란 phosvitin 의 항산화 효과
이성기,한정희 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.5
This study was carried out to investigate the antioxidant activity of egg phosvitin in liposome, meat homogenate and ground pork. The thiobarbituric acid reactive substances(TBARS) of liposome containing various metal ions increased as the following order; FeCl₃$gt; FeSO₄$gt; FeCl₂$gt; MgSO₄$gt; CuSO₄. However the phosvitin inhibited lipid oxidation of liposome with metal ions as the following order; FeCl₃$gt; MgSO₄$gt; ferritin $gt; FeSO₄$gt; FeCl₂$gt; CuSO₄. Therefore, phosvitin showed higher capacity to inhibit iron catalysis of lipid oxidation than copper catalysis in liposome. The TBARS of liposome increased as the concentration of ascorbic acid increased. In contrast, the antioxidant activity of liposome with phosvitin was decreased as the concentration of ascorbic acid increased. The antioxidant activities of phosvitin and camosine in meat homogenate were the highest at pH 7.0. The phosvitin combined with carnosine treatment did not show any synergistic effect for antioxidant activity. Although there was no antioxidant activity of phosvitin in raw ground pork, the phosvitin inhibited heat-catalyzed lipid oxidation in the ground pork and 2% NaCl ground pork(p$gt;0.05).
이성기,김기성,신동화,강통삼,송계원 ( S . K . Lee,K . S . Kim,D . H . Shin,T . S . Kang,K . W . Song ) 한국축산학회 1986 한국축산학회지 Vol.28 No.10
The ripening characteristics of country-style ham were compared with one another among various curing formula. Raw meats were cured with 20, 30, 40, 50% sucrose content of curing mixtures. Hams were prepared by curing 5℃ for 1 month followed by holding at 11℃±1℃ for 1 month and then ripened 4 months at 27℃±1℃ and RH 65-80%. pH of all samples showed an increase from 5.52-5.87 to 6.37-6.44 during ripening. It increased remarkably for the sample with the higher sucrose content. Free amino nitrogen (NH₂-N) increased to 48.9-61.0 ㎎% at the end of the ripening period. Its concentration was also higher as the sucrose content increased. Residual nitrate and nitrite were sharply depleted during the first month of ripening, then changed slowly. At the second month ripening, they were 80 ppm and 50 ppm, respectively. Almost all of ATP, AMP disappeared in various samples although the initial contents were very low. But the remaining amount of ADP was considerably high (1.1-7.4 μmole/g meat) while the other nucleotides almost entirely disappeared. IMP tended to degrade rapidly during ripening. Hypoxanthine accumulated about 5.0-9.3μmole/g at the first month ripening then degraded slowly. Microbial counts generally increased as storage temperature increased. Total plate count and lactic acid bacteria count increased during the first month of ripening (1.8×10^7 and 2.8×10^6 cells/g, respectively), then decreased slowly.
BB절리모델을 활용한 절리암반속 터널안정성의 수치해석적 연구
이성기,정형식 사단법인 한국터널지하공간학회 2001 한국터널지하공간학회논문집 Vol.3 No.3
For the pertinent use of NMT method, both characteristics of jo ints (JRC, JCS and ф r) and characteristics of rock mass(Q-Value) must be investigated carefully. The main objective of the study presented is to investigate how sensitive thepredicted behaviour of an underground excavation is to various realistic assumptions about some input parameter for thejointed rock mass. Joint pattern in the tunnel is predicted by statistical approach (chi-square test). In this paper,sensitivity studies involving in joint characteristics were car ried out. The parametric studies involving change in Barton-Bandis joint model have shown that JCS is relatively insensitiv e to JRC and ф r. An increase in JRC value may not,according to the Barton-Bandis model, necessarily lead to a dec rease in displacement. The importance of dilation inpredicting the behaviour of a rock mass around an excavation is emphasized from a comparison of the Barton-Bandisjoint behaviour model with the Mohr-Coulomb model. The Barton-B andis model predicted higher stress, which allow forthe build-up of stress caused by dilatant behaviour.
Co-occurrence Matrix를 이용한 CT 영상에서 간 영역의 추출
이성기 대한의용생체공학회 2001 의공학회지 Vol.22 No.1
의료영상 처리는 의료 전문가들이 의료영상을 이용한 진단, 치료, 및 연구를 함에 있어 중요한 역할을 하고 있다. 많은 영상 분할 방법들이 의료영상 처리분야에서 성공적으로 사용되고 있다. 본 논문에서는 CT 영상에서 간 영역을 자동으로 추출하는 방법을 제시한다. 본 논문에서는 간 영역을 추출하기 위해 co-occurrence matrix를 적용하였고, 추출된 영역에서 뼈와 근육, 신장 영역을 제거하였다. 제안된 방법은 의료 전문가가 추출한 결과와 비교하여 좋은 결과를 보여주었다.
VPN을 적용한 인터넷 전화 단말기의 성능평가에 관한 연구
이성기,유승선,이명재,곽훈성,Lee Seong gi,Yoo Seung Sun,Lee Myeong jea,Kwak Hoon-Sung 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.6a
To measure the performance of call quality, we have built the experiment environment and observed that the delay caused by encapsulation between internet and VoIP telephones is under 5ms at most. The major delay is assumed to be the time required to capsulate the packet for tunnelling of VPN. Because the difference of average delay time is under $4ms{\sim}5ms$, the difference of call quality between VoIP and VoIP telephone adopting VPN is negligible. We have concluded that the capsulation process between PAC and PNS is the major factor influencing the network load by changing the number of fames in a packet during communication Also, we have concluded that the most suitable frame numbers is tow or three by adding the frame numbers in a packet to obtain the suitable frames in a packet and setting up end-to-end delay under 150ms. 암호화된 인터넷 전화 단말기의 통화품질 측정을 하기위해 실험환경을 구성하여 캡슐화에 따른 지연을 실험한 결과 구현 인터넷 전화기와 일반 VoIP 전화기와의 지연시간의 차이는 최대 5ms 이하였다. 이러한 지연시간의 대부분은 VPN의 터널링을 위한 패킷 캡슐화에 소요되는 지연시간으로 예상할 수 있다. 따라서 일반 VoIP 전화기와 본 연구에서 제시한 VPN을 적용한 VoIP 전화기와의 통화품질의 차이는 무시할 만하였다. 또한 하나의 패킷당 프레임 개수를 다르게 하여 통신하는 동안 네트워크 전체 패킷의 크기를 구하여, PAC과 PNS사이의 캡슐화 과정이 네트워크 부하에 가장 많은 영향을 주는 요소로 작용한다. 따라서 본 연구에서는 최적의 패킷 당 프레임 수를 산출하기 위해 패킷에 할당 하는 프레임 개수를 증가시켜 통화 품질에 문제가 없는 종 단간 지연을 150ms 이내로 할 때, 패킷 당 프레임 개수는 $2{\sim}3$개가 적합하다는 결론을 얻었다.