발아대두 청국장의 발효 중 미생물과 효소활성도의 변화

오훈일(Hoon-Il Oh),엄상미(Sang-Mi Eom) 한국식품과학회 2008 한국식품과학회지 Vol.40 No.1

대두를 25℃에서 48시간 발아시킨 콩을 원료로 볏짚, Bacillus natto, B. natto와 Aspergillus oryzae 혼합균을 접종하여 제조한 청국장과 비발아콩 볏짚으로 제조한 청국장의 발효 중 미생물 및 효소활성도 변화를 조사하고 관능평가를 실시하였다. 4종류의 청국장 모두 발효가 진행되면서 pH가 서서히 증가하여 최대 pH를 보인 이후 다시 감소하여 발효 72시간에는 비발아콩 볏짚 청국장>발아콩 볏짚 청국장>혼합균주를 이용한 발아콩 청국장>B. natto를 이용한 발아콩 청국장 순으로 높은 pH를 나타내었다. 청국장 발효 중 미생물의 변화는 세균의 경우 모든 청국장에서 발효가 진행됨에 따라 급격히 증가하여 발효 12시간에 10?-10? CFU/g를 나타내었으나 그 이후에는 발효시간에 따라 큰 변화를 나타내지 않았다. 곰팡이 수는 B. natto를 접종한 발아콩 청국장을 제외하고는 발효 48-60시간에 10? CFU/g로 최대값을 나타낸 이후 감소하였으며, B. natto를 접종한 청국장은 발효시간에 따라 지속적으로 증가하여 발효 72시간에 10? CFU/g을 나타내었다. Protease 활성은 발효가 진행됨에 따라 acidic과 neutral protease 활성 모두 증가하였으며 neutral protease의 활성도가 acidic protease에 비해 높았다. 이는 청국장 발효과정 중 neutral protease의 최적 활성 pH인 7.0 부근으로 청국장의 pH가 변화했기 때문인 것으로 사료된다. α-Amylase 활성도의 경우 혼합균주를 이용한 발아콩 청국장을 제외하고는 발효가 진행됨에 따라 전반적으로 감소하는 경향을 보였으며, β-amylase 활성도는 혼합균주를 이용한 발아콩 청국장을 제외한 다른 3 종류의 청국장에서 발효 12시간에 최대활성을 나나타낸 이후 감소하였다. 관능검사 결과 냄새와 향기에 있어서 비발아콩 볏짚 청국장의 선호도가 높은 것으로 나타났으나 전체적인 기호도는 B. natto와 A. oryzae를 이용한 발아콩 청국장과 비발아콩 볏짚 청국장이 유사하게 높게 나타났다. This study was carried out to investigate the changes in microflora, enzyme activity and sensory quality of four kinds of cheonggukjang during fermentation. Three different kinds of cheonggukjang were prepared with germinated soybeans using rice straw, Bacillus natto, B. natto plus Aspergillus oryzae, and the last one was prepared with nongerminated soybeans using rice straw. The pH values of cheonggukjang prepared with germinated or non-germinated soybeans increased up to 36 hr of fermentation and then decreased. The number of bacteria and molds increased significantly up to 24 hr of fermentation and then leveled off during fermentation. Acidic and neutral protease activities of all cheonggukjang continuously increased significantly during fermentation. α- and β-Amylase activities of cheonggukjang decreased slightly during fermentation except cheonggukjang prepared with germinated soybeans using the mixed culture. The number of microflora, protease and α-amylase activities were highest in cheonggukjang prepared with germinated soybeans using B. natto plus A. oryzae. The results of the sensory evaluation revealed that for overall acceptability, the cheonggukjang prepared with germinated soybeans using B. natto plus A. oryzae was similar to the cheonggukjang prepared with non-germinated soybeans using rice straw.

A Tree-Based Approach for the Internet Connectivity of Mobile Ad Hoc Networks

오훈 한국통신학회 2009 Journal of communications and networks Vol.11 No.3

We propose a tree-based integration of infrastructure networks and MANETs (TIIM) to efficiently extend the scope of mobile Internet protocol to mobile ad hoc networks and devise a tree-based routing protocol (TBRP) that is suitable for the TIIM architecture. Infrastructure networks have a number of fixed Internet Gateways that connect two heterogeneous networks. Mobile nodes form a number of small trees named pMANETs, each of them growing from anchor node which can communicate directly with an Internet Gateway. A new node registers with foreign agent and home agent along the tree path without resorting to an inefficient flooding. Furthermore, the TBRP sets up a routing path efficiently by exploiting the tree information without relying on flooding. We show by resorting to simulation that our approach is competitive against the conventional AODV based approach.

고령층의 관광제약과 관광지 선택속성이 관광행동에 미치는 영향

오훈성 ( Oh¸ Hoon-seong ),서용석 ( Seo¸ Yong-seok ) 한국호텔리조트학회 2021 호텔리조트연구 Vol.20 No.5

In terms of income level and purchasing power, it is predicted that the elderly will emerge as a leading consumer class, not the underprivileged class of the past. This study attempted to find out how tourism constraints and tourist destination selection attributes affect tourism behavior through empirical analysis of elderly tourists aged 60 or older. To this end, a survey was conducted by 500 elderly people with travel experience within the last year, and 274 samples suitable for research purposes were used for analysis. Descriptive statistical analysis, frequency analysis, reliability analysis, exploratory factor analysis, regression analysis, and one-way variance analysis were used as analysis techniques. As a result of the analysis, it was found that there was a negative (-) causal relationship between internal and attractive factors among tourism constraints. In contrast, positive (+) effect on tourism behavior was discovered on both experiential and attractive factors among tourist selection attributes, and internal and personal constraints among tourism constraints. The implication of the study is that elderly tourists show different characteristics from ordinary tourists, so the differences between their constraints and optional attributes should be carefully reviewed when establishing elderly tourism policies.

중앙버스전용차로의 교차로 좌회전에 따른 버스 정지선 후퇴에 관한 연구

오훈,이진우,이영인 한국ITS학회 2004 한국ITS학회 학술대회 Vol.2004 No.1

테마, 사례 : 세계적인 축제로 나아가는 길

오훈성 대한지방행정공제회 2014 地方行政 Vol.63 No.730

조가선 이상 장력 작용에 대한 전주의 영향 및 보호 대책 연구

오훈,Oh, Hun 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.3

본 연구에서는 통신선 가설 보조 기구인 조가선에 이상 장력이 작용하였을 때 전주의 영향을 유한 요소 해석을 통하여 전주 보호 기구를 설계 해석하여 보호시스템을 개발하였다. 보호시스템은 일반하중 또는 풍압과 일반적인 불평형 하중에서는 조가선이 탈락되지 않고 일정강도 이상이 가해지면 조가선이 자동 탈락되어 전주의 절손 방지 역할을 한다. 이러한 보호시스템의 구조는 유한 요소 해석을 통하여 해석되어졌고, 실제 제품에 대한 인장강도를 측정함으로써 성능을 입증하였다. In this study, we analyzed the influence or electrical pole by FEM(Finite Element Method) and developed protective system by designing and interpreting protective system for electrical pole when abnormal strength worked on messenger wire. Protective system did not shed messenger wire under wind pressure and discontent load but did assign a part to preventing rupture of electrical pole through automatically shed messenger wire over fred strength. Structure of protective system analysis by FEM and prove property by measuring tensile strength for practical product.

직류 서보 전동기 제어의 강인성을 위한 전문가 관리 제어

오훈,박왈서,Oh, Hun,Park, Wal-Seo 한국조명전기설비학회 1995 조명.전기설비 Vol.9 No.6

It is needed to robust control for D.C. servo motor according to industrial automation. However, when a motor has an effect of disturbance and variable load, it is very difficult to guarantee the robustness of the system. as a compensation way of solving this problem, in this paper, a expert supervisory control method for motor control system is presented. Expert supervisory controller is designed by error and error change, and nth control input is decided by the addition of (n-1)th control input and inference amount of increase or decrease. Control input of expert supervisory control is transmitted to input, and the disturbance effect decrease remarkable by control input. The robustness of D.C. servo motor using expert supervisory control is demonstrated by the computer simulation.

서보 시스템을 위한 퍼지 자동 동조 PID 제어기

오훈,윤양웅,Oh, Hun,Yoon, Yang-Woong 한국조명전기설비학회 1995 조명.전기설비 Vol.9 No.1

PDI 제어기는 많은 서보 제어 시스템에 사용되고 있다. 하지만 제어 시스템이 가변부하일 경우에 정밀한 제어는 어렵게 된다. 이에 대한 보완적인 한 방법으로, 본 논문에서는 가변부하일 경우 퍼지 규칙에 의해 PID 제어기의 매개변수를 자동 동조하는 방법을 제시하였다. PID 제어기의 매개변수는 부하 변화에 따라 퍼지 규칙에 의해 결정된다. 퍼지 자동 동조에 의한 정밀한 제어 기능은 모의실험에 의해 확인하였다. PID controller is being used in many servo control system. However, when a control system has variable load, it is difficult to guarantee the accurate control of the system. In the way of solving this problem, in this paper, a auto-tuning method of PID controller parameter using fuzzy rule in variable load is presented. The parameter of PID controller are decided by fuzzy rule according to load variation. The accurate control function of fuzzy auto-tuning is demonstrated by simulation.

연구소원 연구논문초록 ( 재록 , 1998 년 ~ 1999 년 ) : 고초균과 효모를 혼용첨가한 고추장 숙성 중 품질특성의 변화

오훈일(Hoon Il Oh),손성현(Seong Hyun Shon),김정미(Jeong Mee Kim) 영남대학교 장류연구소 2000 영남대학교 장류연구소 연구업적집 Vol.2 No.-

자궁경부암 환자의 림프절 전이판정에서 CT 유도하 세침흡인술의 유용성

오훈일 대한영상의학회 1995 대한영상의학회지 Vol.32 No.3

Purpose: The purpose of this study was to evaluate the usefulness of CT-guided percutaneous needle aspiration(PCNA) of paraaortic and pelvic lymph nodes in patients with uterine cervical carcinoma. Materials and Methods: CT-guided PCNA was performed in 18 patients with treated cervical carcinoma. Initial clinical stages were CIS in one, Ib in three, IIb in ten, and IIIb in four cases. We used 20 gauge Westcott needles for aspiration. Mean depth from skin to lymph nodes was 10.0 cm in paraaortic group (n=13) and was 7.9 cm in pelvic group (n=5). The size of lymph nodes ranged 1.0-3.0 cm (mean: 1.8) and 1.5-5.0 cm (mean: 2.6 cm), respectively. Results: All cases with paraaortic lymph node enlargement were proved to be metastatic lymphadenopathy. In five cases with pelvic lymph node enlargement, three were proved to be malignancy and two were negative. Among 16 cases with metastatic lymphadenopathy, eight patients were treated with chemotherapy, five with radiation therapy, and three with chemotherapy and radiotherapy. In two cases with negative results lymph nodes were disappeared or unchanged on follow up CT scans. No complications were encountered during CT-guided PCNA procedure. Conclusion: CT-guided PCNA of paraaortic and pelvic lymph nodes is a useful method in determining metastasis from cervical carcinoma and in planning further treatment.