침지냉각 조건에 따른 닭 도체의 수분 흡수 및 감량 비교

이재청,김병기,전진안,임찬혁,김효선,이경우,Lee, Jae Cheong,Kim, Byeong-Ki,Jun, Jin An,Yim, Chan Hyok,Kim, Hyosun,Lee, Kyung-Woo 한국가금학회 2014 韓國家禽學會誌 Vol.41 No.3

본 실험은 닭고기 가공 공장별로 침지냉각에 따른 닭 도체의 수분 흡수율 및 감소율 그리고 신선도를 측정 비교하여 품질의 균일화 제고를 위하여 실시하였다. A도계장과 B도계장 닭고기 가공 공장에서 1회 각 40수씩 3회에 걸쳐 총 240수에 대하여 수분 흡수율 및 신선도를 측정하였으며, 수분 흡수율 실험이 완료된 도체에 대하여 개체 포장, 운송하여 실험실 냉장고($4{\pm}1^{\circ}C$)에 입고 후, 저장일별 수분 감소율 및 신선도를 측정하였다. 실험 결과, 수분 흡수율은 A도계장 4.8%, B도계장 4.2%로서 유의적인 차이는 발견되지 않았다. B도계장 실험 도체의 신선도가 냉각 전후 모두, A도계장 실험 도체보다 신선도가 유의적으로 높게 조사되었다. 저장일별 수분 감소율은 A도계장 실험 도체와 B도계장 실험 도체 사이에 유의적인 차이는 나타나지 않았다. 저장일별 신선도는 A도계장 실험 도체가 B도계장 실험 도체에 비해 낮게 조사되었다. 결론적으로 수분 흡수율은 chiller의 길이나 침지시간에 크게 영향을 받지 않으나, 수분 감소율은 침지 시간, 수온 및 심부 온도의 영향을 받는 것으로 예측되었다. This study was conducted to investigate whether water chilling had effect on water retention, freshness or internal temperature of chicken carcasses during chilling or storage in two different chicken processing plants (designated as A and B). A total of 240 carcasses from chicken processing plants (n = 120 per chicken processing plant) was randomly sampled and evaluated the effect of water chilling on carcass characteristics (i.e., water retention, water loss or freshness during chilling or storage). Torrymeter value was used as an indicator of freshness in chicken carcasses. Water chilling did not affect carcass water retention between the processing plants. However, chicken carcasses processing in B plant exhibited significantly higher freshness (p<0.05) compared with those in A plant. This difference in freshness was mainly due to the longer transit time through the water chiller in A versus B plants. Water loss of carcasses during storage was not different between plants. It was found that carcass freshness can be affected by water chilling time as manifested in this study. Further study is warranted to see whether freshness or microbiological status of chicken carcasses may be affected depending on the chilling methods, i.e., air or water chilling.

오리고기 등급제도 도입 필요성에 대하여

이재청,Lee, Jae-Cheong 축산물품질평가원 2011 KAPE누리 Vol.180 No.-

평가원 리포트 II - 세척 방법(비 세척 vs 물 세척 vs 브러쉬 세척)에 따른 계란의 품질수준 비교

이재청,Lee, Jae-Cheong 축산물품질평가원 2013 KAPE누리 Vol.200 No.-

농장 내 특정 음원 노출이 육계의 출하 체중과 닭고기 등급에 미치는 효과

이재청(Jae Cheong Lee),이상혁(Sang Hyeok Lee),조철훈(Cheorun Jo),이경우(Kyung-Woo Lee) 한국가금학회 2020 韓國家禽學會誌 Vol.47 No.2

본 조사는 육계에게 특정 음원에 장기간 노출시켜 출하 후 비정상계 비율 및 등급판정에 따른 A급 비율을 파악하고자 실시하였다. 음원을 제공하는 4개의 육계농가를 선정하여 클래식 음악을 입추일부터 출하일, 일출시부터 일몰시까지 동일한 시간동안 틀어주었다. 4개 농장에서 총 7회의 걸쳐 현장 조사를 진행한 결과, 음원 노출 여부와 상관없이 육계의 출하 체중은 평균 1.5 kg 내외를 나타내었으며, 처리간 차이는 발생하지 않았다(P>0.05). 음원 노출에 따른 닭고기의 신선도(토리미터 수치), 멍/파계 발생율, 이상율 및 A 등급 발생율에도 차이가 발견되지 않았다. 결론적으로 농장단위에서 육계에 특정 음원을 틀어주어도 출하 체중과 닭고기의 품질 등급에는 영향이 없는 것으로 조사되었다. 향후 특정 음원에 따른 육계의 행동, 스트레스, 면역 등 복지를 나타내는 지표에 대한 추가 연구가 필요하겠다. The current study was conducted to evaluate the effect of music enrichment on the live body weight of chickens and meat quality grade of the carcasses. Fourteen flocks at four broiler farms with identical windowless houses were provided with identical starter and finisher diets. These were either exposed to classical music or not exposed to any music from the starter to slaughter age. At 30 days posthatch, the chickens were transported from farms to a slaughterhouse. Two hundred carcasses from each flock were randomly selected for measurement of the carcass traits by the licensed meat inspectors at the slaughterhouse. The live body weights at the slaughter age were not significantly different between the two treatments. In addition, music enrichment did not affect meat freshness (i.e., torrymeter values) nor did it affect other carcass trait variables including percentage of bruises, flesh blemishes, abnormalities, and quality A grade. In conclusion, music enrichment did not affect the body weight or carcass quality of broiler chickens.

원예치료가 지적장애 중학생의 사회성 향상에 미치는 영향

이재청(Lee Jae-Cheong),정상희(Jung Sang-Hui),조원근(Cho Won-Keun) 한국산림휴양학회 2010 한국산림휴양학회 학술발표회 자료집 Vol.2010 No.6월

마하 7 극초음속 충격파 터널에서 항력 감소를 위한 플라즈마 제트 발생 장치 연구

이재청(Jae Cheong Lee),이유석(Yu Seok Lee),이형진(Hyoung Jin Lee),허환일(Hwanil Huh) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.11

초음속/극초음속 비행체의 선두부에서 발생하는 충격파에 의한 항력을 줄이기 위해 역분사 유동에 대한 연구가 시도되고 있다. 본 연구에서는 플라즈마 제트를 분사하기 위해 DC 플라즈마 발생 장치를 제작하고 기초 실험을 수행했다. 고속 유동은 마하 7 극초음속 충격파 터널에서 모사되며, 해당 유동 조건에서 플라즈마가 방전될 수 있는 요구 조건을 분석했다. 질소, 아르곤, 헬륨 가스를 이용한 방전성능 시험을 거쳐 마하 7 극초음속 충격파 터널에서 질소 플라즈마 제트를 분사하여 실험하였다. 실험결과, 마하수 7 극초음속 유동에서 분사 전압력에 따라 플라즈마 역분사 제트가 분사됨을 확인했다. Counterflow jets have been used in an attempt to reduce the drag caused by the shock wave in front of a supersonic/hypersonic vehicle. In this study, a direct-current plasma generator was designed and fabricated to inject plasma jets and fundamental experiments were performed. To simulate high-speed flow, a Mach 7 hypersonic shock tunnel was used and the requirements for plasma discharge under high-speed flow conditions were analyzed. After discharge performance tests using N₂, Ar, and He gas, the N₂ plasma jets were injected and tested in the Mach 7 hypersonic shock tunnel. The results show that counterflow plasma jets were injected according to injection pressures in Mach 7 hypersonic flow.

1-D 시뮬레이션을 활용한 2축 핀틀 추력기 시스템의 압력강하 특성 분석

이재청(Jae Cheong Lee),허환일(Hwan Il Huh) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.3

하나의 연소실을 공유하는 다축 핀틀 추력기 시스템은 다수의 핀틀 추력기로 구성되어 있다. 연소실을 공유하는 시스템의 특성 연구를 목적으로 2축 핀틀 추력기 시스템을 활용한 시뮬레이션 모델을 제안하고 공압시험을 진행했다. AMESim 소프트웨어를 활용하여 단일 핀틀 추력기의 일차원 시뮬레이션 모델을 만들었으며, 정상상태 성능과 비정상상태 성능으로 예측 결과를 검증했다. 시뮬레이션 결과, 챔버를 공유하는 시스템에서 발생하는 압력 손실을 예측 가능하며, 다른 크기의 핀틀 추력기로 구성된 시스템의 압력 강하 요인을 확인했다. 제안한 시뮬레이션 모델은 향후 시스템 설계에서 성능예측에 활용될 것으로 판단된다. A multi-axis pintle thruster with a chamber was connected to several pintle thrusters. To study the characteristics of a system that shares a chamber, a simulation model of two-axis thrusters is proposed, and experimental validation is performed. The simulation model of a single pintle thruster, which is designed by using AMESim software, demonstrated appropriate static and dynamic characteristics. The results show that the model accurately simulates the pressure loss in the system, and determines its cause from the difference in the thruster size. The proposed simulation model can be used to predict the performance of the pintle thruster, and to determine the parameters for the system design.

술 전 화학요법을 받은 유방암 환자에서 WHO와 RECIST 기준에 따른 반응성

이재청(Jae-Cheong Lee),배자성(Ja-Seong Bae),김미라(Mi-Ra Kim),박우찬(Woo Chan Park),송병주(Byong-Ju Song),김정수(Jeong Soo Kim),정상설(Sang-Seol Jung) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.72 No.2

Purpose: This study compared the response evaluation using the WHO (World Health Organization) criteria for patients with breast cancer with that of the RECIST (Response Evaluation Criteria In Solid Tumor) criteria in order to determine the significance of the RECIST criteria in breast cancer. Methods: Between 2001 and 2005, 42 patients with measurable lesions radiologically receiving neoadjuvant chemotherapy for a breast carcinoma were enrolled in this study. The results were compared using a kappa test as a concordance measure between the two response criteria. Results: With the WHO criteria, the overall response and progression rate were 35.7% (CR 0, PR 15) and 16.6% (PD 7) respectively. On the other hand, the overall response and progression rate using the RECIST criteria were 38.0% (CR 0, PR 16) and 7% (PD 3) respectively. The kappa value as a concordance measure between two response criteria was 0.718. Conclusion: The RECIST criteria are comparable to the WHO criteria in evaluating the response of breast cancer patients who have undergone neoadjuvant chemotherapy. A comparison of these results with other studies of more common tumor types supports the implementation of RECIST as the standard criteria for evaluating the treatment response but also for monitoring progression.

산란 주령 및 중량 규격에 따른 계란의 주요 성분 및 내부 품질 비교

이재청(Jae Cheong Lee),김선효(Sun Hyo Kim),선창완(Chang Wan Sun),김창호(Chang Ho Kim),정사무엘(Samooel Jung),이준헌(Jun Heon Lee),조철훈(Cheorun Jo) 한국가금학회 2013 韓國家禽學會誌 Vol.40 No.1

경제성 관련 계육 도체 결함과 축산물등급사에 의한 품질 A등급의 상관관계

최준호,이재청,조철훈,Choe, Jun-Ho,Lee, Jae-Cheong,Jo, Cheor-Un 한국축산식품학회 2009 한국축산식품학회지 Vol.29 No.4

To investigate the relationship between the carcass defects considered by a meat grader and quality grade A, a total of 59,700 broiler carcasses, which were reared from September 1, 2007 to August 31, 2008 and randomly selected from 597 broiler farms with 100 broilers in each farm, were graded by a meat grader using the Korean meat grading system. The average slaughter weight of the broilers increased at the 31- to 33-d age but decreased after the 37-d age. The average daily gain to grade A ratio of the broilers was highest in autumn, and the bruises, flesh blemishes, and abnormalities of the carcasses were found to have been most frequent in winter (p<0.05). The number of economical defects (EDs) increased with the increase in the slaughter age, and the correlation coefficients of the EDs and grade A were -0.88, -0.48, and -0.12 in terms of the conformation, exposed flesh/cuts/tears, and skin discolorations of the carcasses, respectively. The correlation coefficients of the non-economical defects (NEDs) and the grade A of the broiler carcasses were -0.16, -0.22, and -0.32 in terms of the feathers, alien substances, and carcass treatment, respectively. The total number of defects (EDs + NEDs) and the grade A were highly correlated (-0.93), and in particular, the correlation between the grade A and the EDs was -0.91. It can be deemed that the grade A from a meat grader is highly correlated with the EDs. Therefore, the results suggest that broiler carcass grade evaluation using a meat grading system can provide direct information on profits in the market. The resulting carcass grade of broilers can also provide the information needed to decide on a proper incentive for a farm that has attained a good quality grade.