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金炳洵,禹濟仁 中央醫學社 1961 中央醫學 Vol.1 No.6
Giant cell tumor of bone occurs predominantly in young person above 20 years of age, its predilection being at the epiphyseal side of long bones. The authors present here a successfully treated case of benign giant-cell tumor, which occurs in a young girl 17 years of age and situated at the sacrum, the unusual site of occurrence of this tumor, The x-ray finding as well as the clinical manifestation of this case apparently indicated that it might be a malignant one, while it proved definitely benign by its histological examination. The interpretation of biopsy specimen especially from the case already treated surgically must be precautious, as it is sometimes regarded as malignant, while the superimposed infection, the mishandling of the specimen, and the variegated pathological process within the tumor itself are solely attributable to the seemingly malignant appearance.
김병순,이원일 한국디지털경영학회 2020 디지털경영연구 Vol.7 No.1
In this paper, we analyzed the technology management and growth cases of Nano Hi-Tech. Nano Hi-Tech is a technology-oriented company that has grown step by step from the beginning of its foundation to grow into a comprehensive measuring equipment company that aims for a total solution of measuring equipment. In this study, not only the vision, strategy and organizational operation of nano high-tech, but also the step-by-step growth process and success factors were analyzed. The success factors were classified into entrepreneurial competency, technology development competency, and technology commercialization competency. This analysis can be a case study that can comprehensively examine the growth process and success factors for each stage from the beginning of a company's founding.
노지 관수를 위한 로라 기반 환경 모니터링 시스템 구현
김병순 한국인터넷정보학회 2019 인터넷정보학회논문지 Vol.20 No.1
Wireless sensor network is important for precision farming to monitor the growth environment of crops in open field, but radio signals are susceptible to different types of interference such as weather and physical objects. This paper designs and implements an environmental monitoring and weather forecast acquisition systems for smart field irrigation based on LoRa(Long Range) and then applies it to a test bed. And we evaluate the network reliability in terms of packet transmission success rate by comparing its condition on two criteria; the existence of obstacle or rain. The results show that much rain falls can affect on packet loss in LoRa field networks with obstacles. 노지 정밀농업에서 작물의 생육환경 측정을 위한 무선 센서 네트워크 기술이 중요시되고 있지만 무선 신호는 다양한 전파장애 요인들에 의해 통신 장애가 발생할 수 있다. 이 논문은 노지 관수를 위해 로라 기반 환경 모니터링과 일기예보 정보수집 시스템을 설계 및 구현하고 이를 테스트베드에 적용하였다. 그리고 장애물이 있는 환경과 장애물이 없는 환경, 비 오는 날과 비 오지 않은 날 각각에 대하여 사설 로라 네트워크의 패킷 손실률을 비교 분석하였으며, 장애물이 있는 로라 네트워크는 강우량이 많은 날은 패킷 손실에 민감함을 알 수 있었다.