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이민기,신환섭,이재원 한국콘텐츠학회 2024 한국콘텐츠학회논문지 Vol.24 No.2
본 연구는 음식물 폐기물과 시한성을 갖는 식료품 거래의 문제점을 해소하고자 타임커머스를 활용하는 시한성 식료품에 대한 지역 기반 중개 거래플랫폼을 설계하고 개발하였다. 한 지역 대학가를 대상으로 판매자와 구매자를 포함하는 다자간의 모바일 거래가 이뤄지는 중개 플랫폼을 제시하였다. 국내외 식료품 타임커머스의 사례와 서비스 현황을 조사하였으며 시한성 식료품의 거래에 관한 문헌 연구를 수행하였다. 이를 통해 대학가 커뮤니티를 연계하고 SNS와 후기를 사용하는 오가닉 마케팅과 프로모션 중심의 진입전략을 도입하는 시장전략을 도출하였다. 사용자용 시스템은 모바일 인터페이스를 통해 할인 메뉴 검색, 구매, 결제, 예약, 픽업 등을 지원하며, 판매자용 시스템은 잉여 음식 등록, 주문관리, 픽업 처리와 거래 정보관리를 지원한다. 향후 시스템의 비용성과 분석과 이용자의 사용 행태분석을 통해서 지속적 개선연구가 필요하다. This study designed and developed a region-based O2O commerce platform for perishable foods using time commerce to solve the problem of food waste and time-limited food trade. A O2O brokerage platform for multilateral mobile transactions including sellers and buyers was presented for a local university district. Cases and services of domestic and international food time commerce were investigated, and literature research on the transaction of perishable foods was conducted. By that, a market strategy was derived to connect the university community and introduce organic marketing and promotion-oriented entry strategies using SNS and reviews. Buyer side system supports discount meal search, purchase, payment, reservation, and pickup through the mobile interface, and seller side system supports surplus food registration, order management, pickup processing, and transaction information management. Further improvement research is needed through system cost analysis and user usage behavior analysis.
이민기,신영기,박순규,허재영,도창호,조군제,임홍섭,문원국,최장락,이헌직 대한내과학회 1990 대한내과학회지 Vol.39 No.2
Tuberculous osteitis of the skull is an uncommon condition, first reported by Reid of Erlangen, who described two cases in 1842. By 1933. only 220 cases had been recorded in world literature (Strauss). It occurs in approximately 1%. of all patients with tuberculous osteitis and is diagnosed by clinical manifestation, skull roentgenogram, smear and culture of aspirated pus, and biopsy of granulation material. It responds readily to chemotherapy and the prognosis is favorable. To the best of our knowledge, the condition has not been previously reported in Korea. But recently we experienced a case of tuberculous osteitis of the skull in an 18-year-old male patient who complained of dyspnea, chest pain, multiple swelling of scalp and right eye proptosis. The patient was treated with antituberculous medication and discharged with his condition improved.
이민기,박근우,Lee, Min-Ki,Park, Kun-Woo 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.1
The determination of the direct kinematics of the parallel mechanism is a difficult problem but has to be solved for any practical use. This paper presents the efficient formulation of the direct kinematics for double parallel robot arm. The robot arm consists of two parallel mechanism, which generate positional and orientational motions, respectively. These motions are decoupled by a passive central axis which is composed of four revolute joints and one prismatic joint. For a set of given lengths of linear actuators, the direct kinematics will find the joint displacements of th central axis from geometric constraints in each parallel mechanism. Then the joint displacements will be converted into the position and the orientation of the end effector of the robot arm. The proposed formulation is decoupled and compacted so that it will be implemented as a real-time direct kinematics. With the proposed formulation, we analyze the motion of the double parallel robot and show its characteristics. Specially, we investigate the workspace in terms of positional space as well as orientational space.
이민기 부산대학교 병원 암연구소 2006 부산대병원학술지 Vol.- No.20
Purpose: Bronchogenic carcinoma is generally considered as a disease that predominantly affects middle-aged and elderly man. Relatively a small number of patients are diagnosed in the third and fourth decade of life or earlier. The current study was performed to review the clinical characteristics of bronchogenic carcinoma in patients younger than 40 years of age. Subject and methods: Total 32 patients who visited and diagnosed as primary lung cancer at the Pusan National University Hospital from January 2000 to December 2005 were analysed. Results: The results obtained were summarized as follows. 1) The total number of patients was 32 cases : 14 case of man and 18 cases of women. Average age was 35.3 ± 4.6 years. Male to female ratio was 1 : 1.46. 2) Adenocarcinoma was the most frequent cell type of young age lung cancer group. 3) Stages Ⅲ and Ⅳ (89.5%) tumors were frequent in young age lung cancer group. 4) Distant metastasis rate(68.8%) was also higher in young age lung cancer group. Conclusions: The predominance of adenocarcinomas, the lower male-female ratio, and the high incidence of advanced stage lung tumor at the diagnosis are the characteristics of lung cancer in patients younger than 40 years of age.
UPLC-DAD-QToF/MS를 이용한 야콘(Smallanthus sonchifolius) 괴근 내 페놀산 유도체 분석
이민기,김헌웅,이선혜,Gelila Asamenew,김영진,이수지,정현아,유선미,김정봉 한국식품영양과학회 2018 한국식품영양과학회지 Vol.47 No.12
The reported/proposed positive ion fragmentation of phenolic acid derivatives in yacon (Smallanthus sonchifolius) were summarized in the constructed LC-MS library for identification based on the literature. A total of fifteen phenolic acid derivatives (fourteen caffeoyl derivatives and one p-coumaroyl derivative) were separated and identified from the tuberous roots of yacon using UPLC-DAD-QToF/MS. Each caffeoyl derivative was conjugated with altraric acid, quinic acid, and octulosonic acid. The total content of each caffeoyl derivative was as follows: caffeoylaltraric acids (1,218.4 mg/100 g dry weight)> caffeoylquinic acids (331.5)> caffeoyloctulosonic acids (125.2). In particular, 2,3,5- or 2,4,5-tri-O-caffeoylaltraric acid (63% of the total phenolic acid derivatives) showed the highest contents followed by 5-O-caffeoylquinic acid (chlorogenic acid, 14%). Moreover, 2,3,5- or 2,4,5-tri-O-caffeoylaltraric acid methyl ester and 5-O-p-coumaroylquinic acid as new phenolic acid derivatives in yacon were identified putatively by the mass spectral data. This indicates that the individual phenolic acid derivatives in yacon might be determined easily using the constructed LC-MS library. Furthermore, it can provide valuable information for future studies on the health-promoting properties of yacon. 본 연구에서는 야콘에 보고된 페놀산 유도체의 라이브러리를 제작하고 이를 바탕으로 ToF/MS를 통해 검출된 양이온 질량 패턴을 비교하여 개별 페놀산 유도체의 조성 및 함량 정보를 제공하고자 하였다. 국내에서 재배된 괴근으로부터 caffeoyl 유도체(14종)와 coumaroyl acid 유도체(1종)를 분리・동정하였다. 개별 유도체는 caffeic acid와 altraric acid, quinic acid, octulosonic acid가 결합된 형태로 존재하였으며, 모분자로부터 제거된 caffeic acid의 단편 이온 패턴을 나타내었다. 각 유도체의 총 함량은 caffeoylaltraric acid 유도체 > caffeoylquinic acid 유도체 > caffeoyloctulosonic acid 유도체 순으로 높았다. 이 중 2,3,5- 또는 2,4, 5-tri-O-caffeoylaltraric acid 및 chlorogenic acid는 각각 총 함량의 약 63%, 14%로 괴근의 주요 성분이었다. 또한 이미 보고된 페놀산 유도체 이외에 2,3,5- 또는 2,4,5-tri- O-caffeoylaltraric acid methyl ester와 5-O-p-coumaroylquinic acid가 확인되었으며, 이는 야콘에서 보고된 적 없는 새로운 화합물이었다. 그러나 입체 배열에 따라 다양한 이성질체가 존재하는 caffeoylaltraric acid 유도체는 다양한 분석 기법을 통해 보다 정확한 동정이 필요할 것이다. 야콘 라이브러리에 수록된 페놀산 유도체 정보는 향후 정확한 구조 동정 및 함량 평가를 돕고 나아가 기능성 소재로서의 활용 가능성을 높일 수 있을 것으로 판단된다.