국내 해양자원 유래 가축사료 연구 분석

최혁 ( Hyuck Choi ) 한국키틴키토산학회 2021 한국키틴키토산학회지 Vol.26 No.3

This review provides an overview of research data form published journal and thesis using feed stuff derived from marine resources and current status of pet food. Marine feed stuff has been widely used as livestock feed for a traditionally in Korea. However, due to the production and price of marine feed stuff, the amount used as a formula feed is very low. Results of this study showed that marine feed stuff have sufficient nutritional value as a livestock feed, and thus could replace imported grain feed. Furthermore, expect to many uses of pet food. These feed stuff derived from marine resources are eventually cost-effective for livestock farmers. In addition, there is a high possibility of developing new products for pet food. However, which has a small amount of marine resources production and insufficient basic research to be used as formula feed industry. Therefore, suggest that best efforts to should be made to improve the quality of livestock products using marine feed stuff along with the development of mass production technology of marine resources.

반려동물 양육이 취약계층에 미치는 영향: 광주광역시 광산구 종합사회복지관 사례를 중심으로

최혁 ( Hyuck Choi ),손명동 ( Myeongdong Son ) 인문사회 21 2023 인문사회 21 Vol.14 No.1

연구 목적: 이 연구는 광주광역시 광산구에 거주하고 있는 취약계층을 대상으로 반려동물 양육 현황과 반려동물이 양육자에게 미치는 효과에 대해 탐색하는 데 목적이 있다. 연구 방법: 연구 방법은 광주광역시 광산구에 있는 종합사회복지관 이용자 중 반려동물에 관심 있는 이용자 131명을 대상으로 설문조사를 실시하였고, 이 중 111명을 분석에 사용하였으며, SPSS 프로그램을 이용해 빈도분석, F-검증(ANOVA) 및 t-검증(t-test)을 수행하였다. 연구 내용: 이 논문은 취약계층의 양육 현황과 보호 구분에 따른 반려동물 양육의 긍정적인 효과, 장애 유무에 따른 반려동물 양육의 긍정적 효과를 분석하였다. 결론 및 제언: 반려동물은 취약계층의 복지 증진에 효과적인 방법임이 확인되었고, 반려동물 양육지원이 필요한 것으로 나타났다. 따라서 사회복지와 반려동물 관련 학문이 융합하여 새로운 인력을 양성하고, 취약계층을 돕는 방안을 마련해야 할 것이다. This study aims to analyze the current status of rearing pets and the effects of pets on owners for vulnerable groups living in Gwangsan-gu, Gwangju. The research methods surveyed 131 users interested in pets at General Social Welfare Center, in Gwangsan-gu, Gwangju, and 111 were used for analysis, frequency analysis, F-validation (ANOVA), and t-test was performed using the SPSS program. The research contents of this paper analyzed the positive effects of pet rearing according to the status of rearing of the vulnerable groups and the classification of protection, and the positive effects of pet rearing according to the presence or absence of disability. It was confirmed that pets are an effective method of improving the welfare of the vulnerable, and it was found that support for rearing the pet was necessary. Therefore, social welfare and pet-related studies should be combined to foster new manpower and come up with measures to help vulnerable social groups.

상변화 메모리 응용을 위한 Sb을 첨가한 Ge₁Se₁Te₂ 박막의 열처리 후 상변화 특성

김현구(Hyun-Koo Kim),최혁(Hyuck Choi),남기현(Ki-Hyeon Nam),정홍배(Hong-Bay Chung) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11

A detailed investigation of cell structure and electrical characteristic in chalcogenide-based phase-change random access memory(PRAM) devices is presented. We used compound of Ge-Se-Te material for phase-change cell. Actually, the performance properties have been improved surprisingly then conventional Ge-Sb-Te. However, crystallization time was as long as ever for amorphization time. We conducted this experiment in order to solve that problem by doping-Sb with annealing.

Evaluation of non-conventional feeds for ruminants using in situ nylon bag and the mobile bag technique

Youl-Chang Baek(백열창),Hyuck Choi(최혁) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.7

본 연구는 반추동물 사료로서 한국에서 생산된 부존사료자원 15종의 화학적 조성, 소화율 그리고 에너지 가를 평가하기 위하여 실시하였다. 반추위 그리고 십이지장 캐뉼라가 장착된 거세한우 3두(평균체중 520 ± 20.20 kg)를 개별 계류식우사에 공시한 후 14일의 순치기간과 3일간의 시험기간을 두었다. 실험 방법으로는 화학조성 분석법, in situ 나일론백과 모바일백 방법을 이용하였다. 사료 내 화학적 조성을 분석한 결과, 엿밥, 깻묵, 장유박 및 두유박의 조단백질 함량은 30% 이상이었다. In situ 나일론백을 이용한 사료의 분해 특성을 분석한 결과, 비트펄프, 맥주박, 커피박, 엿밥, 수수겨, 임자박, 라면박 및 두유박의 반추위 미분해 단백질 함량은 50% 이상이었다. In situ 모바일백을 이용한 사료 내 가소화 영양소총량(TDN)의 분석은 비트펄프, 맥주박, 막걸리박, 수수겨, 깻묵, 라면박, 미강, 장유박, 비지, 두유박 및 밀기울이 50% 이상인 것으로 관찰되었다. 요약하자면, 상기 부존사료자원은 배합사료 또는 조사료를 대체할 수 있는 훌륭한 사료자원으로서의 높은 잠재적 가치를 가지고 있음을 시사하고 있다. 따라서 본 연구에서 얻은 부존사료자원의 화학적 조성, 소화율 및 에너지 가를 반추동물 섬유질배합사료 제조를 위한 기초 자료로 활용하고 이를 통해 사료효율 향상, 사료비용 절감 및 환경오염 감소에 기여하고자 한다. This study was conducted to evaluate the chemical composition, digestibility, and energy value of 15 non-conventional feeds produced in South Korea as ruminant feeds. Three Hanwoo steers (body weight, 520 ± 20.20 kg) fitted with a permanent rumen cannula and duodenal cannula were housed individually in tie-stall barns, followed by a 14-day adaptation period and 3-day experimental period.Chemical composition analysis, in situ nylon bag, and mobile bag technique were used as experiments. As a result of the chemical composition analysis offeeds, crude protein (CP) contentsofmalt meal, perilla meal, soy sauce cake, and soymilk residue were greater than 30%. As a result of the degradability characteristics analysis of feeds using an in situ nylon bag, rumen undegraded protein (RUP) contents of beet pulp, brewer"s grain, coffee meal, malt meal, milo bran, perilla meal, ramen residue, and soymilk residue were greater than 50%. Analysis of total digestible nutrient (TDN) values of feeds using an in situ mobile bag showed that TDN values of beet pulp, brewer"s grain, makgeolli residue, milo bran, perilla meal, ramen residue, rice bran, soy sauce cake, soybean curd cake, soymilk residue, and wheat bran weregreater than 50%. In summary, these non-conventional feeds have high potential value as good feed resources to replace formulated feeds or roughage. Therefore, the chemical composition, digestibility, and energy value of non-conventional feeds obtained from this study can beused as base data for the manufacture of ruminant total mixed ration (TMR) with improved feed efficiency, reduced feed costs, and reduction of environmental pollution.

호남지역 논 재배에 적합한 곡실 사료용 밀 품종 선발 및 사료가치 평가

백열창(Youl-Chang Baek),최혁(Hyuck Choi),김민석(Minseok Kim),박종호(Jong-Ho Park) 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.3

본 연구는 호남지역 유휴 논토양에서 곡실 사료용 밀 생산에 적합한 품종 선발을 위해 국내산 총 8개(금강, 조경, 백중, 수안, 청우, 고소, 호중, 조중)의 품종을 선택하여 전북 완주군에서 2015년부터 2016년까지 파종 및 수확하였으며, 사료가치 평가를 위해 일반성분 및 반추위 소화율 분석을 실시하였다. 시험품종 중 출수기는 “조중”이 4월 15일로 가장 빨랐으며, 성숙기 또한 5월 24일로 가장 빨랐다. “백중”의 출수기는 4월 18일로 “금강”과 같았고, 성숙기는 5월 29일로 하루 늦었지만 전 시험품종 간의 유의성은 없었다. 경수는 “고소”가 513개/m²로 가장 적었으며, “청우”가 974개/m²로 가장 많았다. “백중”의 경수는 901개/m²로 시험품종 중 경수가 많은 품종에 속하며, 수확량은 542kg/10a으로 가장 많았다(p <0.05). 일반성분 분석, 반추위내 건물 및 조단백질 소화율 평가에서 시험품종 간 유의적인 차이는 보이지 않았으며, 옥수수보다 높은 영양 가치와 소화율을 확인하였다. 따라서 상기 8개 밀 품종은 공히 수입곡물을 대체 할 수 있는 훌륭한 사료자원이며, 수확량이 높은 품종을 선택하여 곡실 사료로의 이용성을 확대하면, 논경지이용효율 증대와 더불어 축산농가 사료비 절감에 도움이 될 것으로 사료된다. The purpose of this study was to select the wheat varieties, among 8 domestic cultivates, that are suitable, for use as grain feed at paddy fields in the Honam region. The seeds of wheat were sown and harvested in Wanju County. Among the wheat varieties, "Jojoong" was the earliest for its heading date on April 15, and it showed the earliest day for the maturing date on May 24. The heading date of "Baegjong" was the same as that for "Keumkang" on April 18, and the maturing date was one day later than that for "Keumkang" on May 29. But there was no significant difference of heading and maturing dates among the 8 wheat varieties. The lowest number of spikes/m² was 513/m² of "Goso", and the highest number of spikes/m² was 974/m² of "Chongwoo". The spikes/m² and yield of "Baegjon" was 542kg/10a and it was the highest yielding variety among the 8 wheat varieties. The chemical compositions of DM (dry matter) and CP (crude protein) on rumen digestibility were not significantly different among the 8 wheat varieties. Furthermore, rumen digestibility of DM and CP, and the nutrients value were slightly higher than those of corn. The domestic 8 wheat varieties for grain feed, with their high nutrient qualities, could eventually replace imported grain feed and wheat grain feed. These 8 varieties are cost-effective feed and paddy field fodder for livestock farmers.

퍼지이론을 이용한 강 뼈대 구조물의 최적화에 관한 연구

이규원,고성곤,최병한,최혁 전북대학교 공업기술연구소 2000 工學硏究 Vol.31 No.-

The optimization algorithm of steel frame with fuzzy sets theory is presented in this study. Two types of portal frame(1story-1bay and 1story-2bay) were taken as the structural models for analyzing the convergence to optimum solutions, studying the applicability and efficiency of this algorithm. In this study, the total weight was used for the objective function, and the cross sectional area of members are adopted as the design variables. The results of numerically tested for two types of portal frame can be summarized as follows : a. As the membership function considered uncertainty of loads is increased objective function is decreased gradually b. Tendency of optimization of steel frame structure is converged to the optimum solution stably and little bit fast within the second iterations. Finally this study is more practical design, because it is considered the uncertainty of the loads. This design method is possible to present the sufficient data to the stage of preliminary design because user can choose optimum solution suitable to practical situation as it is presented by α-cut aproach.