튀김용 돈지의 열산화 안정성에 미치는 $\beta-Carotene$의 효과

한규호,박표잠,전병태,박우준,이치호,Han Kyu-Ho,Park Pyo-Jam,Jeon Byung-Tae,Park Woo-Joon,Lee Chi-Ho 한국축산식품학회 2005 한국축산식품학회지 Vol.25 No.4

본 연구는 $80^{\circ},\;130^{\circ}C$ 및 $180^{\circ}C$온도대별로 유열 처리한 돈지에 $0\%,\;0.001\%$ 및 $0.004\%$의 수준으로 $\beta-carotene$을 첨가한 후 $50^{|circ}C$에서 15일간 보관시키면서 $\beta-carotene$ 총의 열 산화 안정성을 알아내기 위하여 총 균수검사, 과산화물가 (Peroxide value), 산가(Acid value) 및 TBA가를 측정하여 비교한 결과 다음과 같은 결과를 얻었다. 1) 미생물 총 균수 실험에서 $\beta-carotene$의 첨가량이 $0\%,\;0.001\%$ 및 $0.004\%$로 증가함에 따라 균의 증식이 현저하게 억제되었다. 온도대별로 $180^{\circ}C$ 처리 군에서는 저장기간이 길어질수록 총 균수가 증가하는 경향을 나타내었으나, $80^{\circ}C$ 및 $130^{\circ}C$ 처리 군에서는 저장 기간이 길어질수록 총 균수가 현저하게 증가하였다. 2) 과산화물가의 측정 실험에 $\beta-carotene$의 첨가량이 $0.004\%$일 때가 $0\%,\;0.001\%$에 비해 유의하게 (P<0.05) 낮은 값을 나타냈다. 3) 산가의 측정실험에서 저장기간이 길어지면서 $\beta-carotene$의 첨가량이 증가할수록 항산화 능력과는 정의 상관관계를 나타났다. $\beta-Carotene$의 첨가량이 $0.004\%$일 때가 $0\%,\;0.001\%$에 비해 유의하게 (P<0.05) 낮은 값을 나타냈다. 4) TBA가 측정실험에서 대조군과 시료와의 비교에서 온도가 증가함에 따라 값이 상승하는 경향을 나타냈으며, 저장 기간 15일째 $\beta-carotene$의 첨가량이 $0.001\%$ 및 $0.004\%$ 처리 군이 대조군에 비해 유의하게 (P<0.05) 낮은 값을 나타냈다. 따라서 유열처리 한 돈지에 $0.004\%$ $\beta-carotene$을 첨가하면 열 산화 방지에 매우 효과적인 것으로 사료되었다. This study was designed to investigate the effect of $\beta-carotene$ on the heat oxidation stability of deep fried laid with different healing temperature. Commercially purchased $\beta-carotene$ was used to this experiment $\beta-carotene$ was added to the deep fried lard at final concentration of $0\%\;0.001\%\;and\;0.004\%$ (wt/wt fat basis). Total plate count peroxide value, acid value, and TBA(thiobarbituric acid) values of the samples were determined regulary at $50^{\circ}C$ during 15 days. The result of the study are as follows: The number of microorganism was decreased by $\beta-carotene$ added to the deep fried lard Deep fried lard with $0.004\%$ $\beta-carotene$ have higher antioxidative effect than those of control and $0.001\%$ treated group. Peroxide and TBA values were significantly (P<0.05) decreased in all samples by added $\beta-carotene$ at $0.004\%$ Antioxidative effect increased with increasing concentration of $\beta-carotene$. These results suggest that $\beta-carotene$ might inhibit the growth of microganisms and retard lipid oxidation in the deep fried lard.

하드페이싱 오버레이용접 비드형상에 미치는 GMA 용접조건의 영향

한규호,김준기,김철희,김정한,남시환,전치중,Han, Kyu-Ho,Kim, Jun-Ki,Kim, Cheol-Hee,Kim, Jeong-Han,Nam, See-Hwan,Jeon, Chi-Jung 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.5

The relationship between GMA welding conditions and the bead shape of overlay weld was studied by using ${\Phi}1.6mm$ hypo-eutectic metal-cored wire designed for hardfacing against the severe metal-to-metal wear. As the welding voltage increased, the dilution also increased but the sudden drop of dilution was observed at $30{\sim}33V$. It was considered to be due to the decrease of penetration resulting from the change of transfer mode, from short circuit to spray. It was also found that the behavior of penetration with welding current was dependant on the transfer mode. The short circuit mode exerted the penetration to decrease while the spray mode did it to increase with increase of welding current. The former was considered to be responsible for the remarkable decrease in dilution at low welding voltage region. The change of transfer mode also had an effect on the behavior of bead width with welding current but it did not on the bead spreadability defined as W/H ratio. It was considered that the optimal welding conditions for multi-pass overlay welding could be obtained from the bead spreadability suitable for bead lapping and the dilution as low as possible in the spray transfer mode.

Mitochondrial Malate Dehydrogenase 활성을 이용한 냉장우육과 냉동우육의 판별법 개발

한규호(Kyu-Ho Han),김남규(Nam-Kyu Kim),이시경(Si-Kyung Lee),조진국(Jin-Kook Cho),최강덕(Kang-Duk Choi),전유진(You-Jin Jeon),이치호(Chi-Ho Lee) 한국식품영양과학회 2005 한국식품영양과학회지 Vol.34 No.10

본 연구는 냉장우육과 냉동우육의 판별법을 개발하기 위하여, 한우 육을 부위별(사태, 등심, 우둔, 양지)로 구입하고 냉장(4±1℃), 냉동(-4, -18, -77℃)상태로 15일 저장하면서 압착육즙채취기를 이용하여 근육 세포내 mitochondria 막에 존재하는 mitochondrial malate dehydrogenase 활성 특성을 비교 연구한 결과 다음과 같은 결과를 얻었다. 본 실험을 위하여 제작된 압착육즙채취기를 이용하여 정량적인 압착 육즙을 얻을 수 있었고, 1.5 g의 우육을 이용하였을 때 0.15 mL의 압착육즙을 얻었다. 냉장우육과 냉동우육 간의 mitochondral malate dehydrogenase의 각 부위별 활성은 사태의 경우 냉장우육은 23.63 Unit/mL의 활성을 나타내었고, -4℃는 20.91 Unit/mL, -18℃는 26.43 Unit/mL 그리고 -77℃는 25.90 Unit/mL의 활성을 나타내었다. 동일한 부위에서 저장온도에 따른 효소의 활성도는 냉장우육보다 -4℃를 제외한 냉동 저장 온도(-18, -77℃)에서 모두 유의적으로 높은 효소의 활성을 나타내었다(p<0.05). 동일한 저장 온도에서 각 부위 간에 활성의 차이점은 -77℃에서 냉동 저장한 우육이 유의적 차이 없이 가장 높은 효소 활성을 나타내었고, -77℃ 저장온도를 제외하고는 모두 유의성 있는 변화량을 나타내었다(p<0.05). 실험군의 압착육즙 내 mitochondrial malate dehydrogenase의 활성은 10분간 흡광도 변화량을 조사함으로써 계산되었다. 등심을 제외한 모든 부위에서 효소반응개시 3분 후에 -4℃에서 동결우육을 제외하고 동결우육의 효소 활성이 떨어지는 것을 확인할 수 있었고, 5분 반응 후에는 그 효소의 활성을 발견할 수 없었다. 냉장우육은 12분까지 활성을 측정할 수 있었다. 15일간 냉장우육 및 냉동우육을 저장 온도에 따라 저장하면서 그 활성을 측정하였는데, 저장 기간이 길어져도 그 효소 활성의 차이는 유의적으로 변화하지 않고, 모든 실험군(사태, 등심, 양지, 우둔 부위)에서 유의적으로 유사한 활성을 유지하였다(p<0.05). 따라서 본 연구결과로부터 mitochondrial malate dehydrogenase의 활성을 이용하여 냉장우육과 냉동우육 유무를 판별하는데 유효한 지표로 사용 가능한 것으로 사료되었다. The object of this study is to develop the method for differentiating fresh meat from frozen meat by using the measurement of the mitochondrial malate dehydrogenase in the Korean native cattle. The principle of this experiment is based on the fact that the enzyme proteins associated with mitochondria membrane could be released by freezing. The methods of differentiating fresh meat from thawed, frozen meat were studied by measurements of mitochondrial malate dehydrogenase activity of meat press juice. Fresh and frozen beef were stored at 4, -4, -18 and -77℃ for 15-day storage period. A meat press machine using air pressure was manufactured especially for these experiments, and sufficient amount of drip (about 0.15 mL/g) from 1.5 g of beef sample was efficiently obtained under a pressure of 8 kg/cm2 generated by the meat pressing machine. The mitochondrial malate dehydrogenase activities of frozen meat drip juices stored at -18 and -77℃ were significantly higher than those of fresh and frozen meat samples at -4℃ (p <0.05) during 10-min reaction period. However, the enzyme activities of the frozen meat drip juices (-18 and -77℃) disappeared after 5 minutes of the reaction, which was not observed from the fresh and -4℃ frozen meats. The enzyme activity maintained until 12 minutes for the fresh and -4℃ frozen meats. From these results, the mitochondrial malate dehydrogenase could be considered as an indicator to differentiate fresh beef from frozen one.

고양이 신장에서 Urate 및 PAH 배설 특성

한규호(Kyu Ho Han) 대한내과학회 1990 대한내과학회지 Vol.39 No.3

N/A The renal handling of urate and PAH has been investigated during continuous infusion of these organic anions in anesthetized cats. Fractional excretion of urate was 0.18±0.01, demonstrating only a net reabsorption by the cat kidney. Urate clearance and fractional excretion were independent of the plasma urate concentration but dependent on urine flow. The Urine/plasma ratio of urate concentration was l. 03±0.03, suggesting the existence of a reabsorption process by an active mechanism. Fractional excretion of PAH was 3.86±0.23, demonstrating only a net secretion. PAH clearance and fractional excretion were independent of the plasma PAH concentration and urine flow. The Km and Vmax values for urate reabsorption were 56.7±1.85 mg/ml and 89.7±2.09mg/min/kg, respectively. The and Vmax values for PAH secretion were 61±1.03 mg/ml and 805±0.15 mg/min/kg, respectively. Urate and PAH did not affect each other in the renal handling. These results demonstrate the net reabsorption of urate and net secretion of PAH by a carrier-mediated process in the cat kidney. Furthermore, the renal handling of urate was different from that of PAH. Probenecid (30 mg/kg) increased the fractional excretion of urate by inhibiting urate reabsorption, but reduced the fractional excretion of PAH by inhibiting PAH tubular secretion.

고추씨유, 캡사이신 및 토코페롤의 첨가가 돈지와 대두유의 산화안정성에 미치는 영향

이치호,한규호,김아영,이슬기,홍고은,변장원,최강덕,양철영,Lee, Chi-Ho,Han, Kyu-Ho,Kim, Ah-Young,Lee, Seul-Ki,Hong, Go-Eun,Pyun, Chang-Won,Choi, Kang-Duk,Yang, Cheul-Young 한국축산식품학회 2008 한국축산식품학회지 Vol.28 No.5

This study was designed to compare the thermal oxidative stability of lard, soy bean oil, and hot pepper seed oil for 0-3 d at $100^{\circ}C$, and to evaluate the effect of capsaicin on thermal oxidative stability in lard and soy bean oil. As result, thermal oxidation stability was shown in the order hot pepper seed oil>soy bean oil>lard for 0-3 d at $100^{\circ}C$. In blended oils, hot pepper seed oil effectively inhibited lipid oxidation when mixed with lard than soy bean oil by showing the ratio of 30% pepper seed oil plus 70% lard and 60% pepper seed oil plus 40% soy bean oil inhibited lipid oxidation during storage periods. And to investigate the antioxidative effect of antioxidants such as capsaicin and alpha-tocopherol in hot pepper seed oil, 1,200 and 2,400 ppm capsaicin, or 0.3% alpha-tocopherol were added in soy bean oil and lard and stroed for 0-3 d at $100^{\circ}C$. Capsaicin inhibited lipid oxidation in lard but not in soy bean oil, however alpha-tocopherol exhibited a prooxidaton effect in soybean oil. Therefore, it suggests that the application of hot pepper seed oil or capsaicin in lard may be better for thermal oxidative stability.

센서 네트워크의 개요 및 기술동향

채동현(Dong-Hyun Chae),한규호(Kyu Ho Han),임경수(Kyung Soo Lim),안순신(Sun Shin An) 한국정보과학회 2004 정보과학회지 Vol.22 No.12

공개 키를 기반으로 하는 무선망에서의 암호화 키 분배 방법

안수현(Soo-Hyun Ahn),한규호(Kyu-Ho Han),안순신(Sun-Shin Ahn) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅲ

최근 보안에 관한 관심이 높아지면서 IPSec을 이용한 VPN system의 널리 이용되고 있다. IPSec에서 암호화에 사용되는 키를 생성하는 IKE는 IPSec의 핵심 프로토콜이지만 다소 복잡하고 메시지 교환도 많아 패킷의 손실이 큰 무선망 에는 적합하지 않다. 무선망에서 좀 더 효율적으로 동작하기 위한 인터넷 키 교환 방법 및 공개키 기반구조를 제시 하였다.

이동 인터넷 프로토콜을 위한 개선된 SKIP Firewall Traversal

김민경(Min-Gyung Kim),한규호(Kyu-Ho Han),채동현(Dong-Hyun Chae),마영식(Young-Sik Ma),안순신(Sun-Shin An) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.1A

최근들어 security가 데이터 통신의 중요한 이슈로 떠오르고 여러 기관들의 망에 Firewall을 설치하여 보호하는 것은 점점 더 일반화 되고있다. Sun의 SKIP Firewall Traversal 방법은 Mobile IP가 Firewall이 설치된 환경에서도 제대로 동작할 수 있도록 고안된 것이다. 그러나 이 방법은 실제 적용에 있어 몇몇 문제점이 발견된다. 본 논문에서는 이 문제점들을 살펴보고 그것을 해결하는 방안을 제시하고자 한다.

대장 및 소장에 병발한 악성 임파종

조성락(Sung Rag Cho),김주호(Ju Ho Kim),한규호(Kyu Ho Han),박인철(In Cheol Park),김순관(Soon Kwan Kim),양만석(Man Seok Yang),허갑도(Gap Do Hur),최환주(Hwan Joo Choi),지정희(Jung Hee Ji) 대한소화기학회 1989 대한소화기학회지 Vol.21 No.3

This paper describes a unique case of concurrent malignant lymphoma of the colon and small intestine. Primary gastrointestinal lymphoma primarily confined to gastrointestinal tract is relatively rare disease, and the concurrent lymphoma of colon and small bowel is very rare in reported cases. We experienced of malignant lymphoma of entire ileum and colon, especially cecum. Ileum was widely involved, and colonic lumen was stricture and mucosal fold was destructed by polypoid mass and ulceration. He was expired due to ileal perforation. We report this case with a review of the literature.

간우엽 형성부전

조성락(Sung Rag Cho),나산균(San Gyun Rha),문성수(Seong Soo Moon),한규호(Kyu Ho Han),박인철(In Cheol Park),김순관(Soon Kwan Kim),양만석(Man Seok Yang),허갑도(Gap Do Hur),최태룡(Tae Lyong Choi) 대한소화기학회 1991 대한소화기학회지 Vol.23 No.1

Unilobular atrophy or hypoplasia involving the hepatic lobes is not uncommon on the left side. It is distinctly uncommon on the right, where it probably represents an developmental anomaly if no other etiological factor is demonstrable. So we report a case of hypoplasia of right hepatic lobe.