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김도훈(Kim Do Hoon),채광영(Chae Kwang Young),고만재(Go Man Jae),정해지(Jeong Hae Ji),유호동(Liu Hao Dong),조용호(Cho Young Ho) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 논문에서는 수중음향통신을 활용하여 CTD센서와 DO센서를 통해 수중환경데이터를 측정하고, 측정된 값을 육상에서 확인할 수 있도록 하는 실험을 진행하였다. 본 실험은 남해 실해역에서 20년 12월 12일부터 20일까지 진행되었으며, 구조물은 해수면에 해상부이 1대, 해저면에 수중기지국 2대, 센서노드 10대를 설치하였다. 모든 구조물에는 송신을 위한 트랜스듀서와 수신을 위한 하이드로폰이 장착된다. 해상부이는 해저면에 설치된 수중기지국과 센서노드에서 수중환경데이터를 수신한 후 육상 서버와 통신하여 패킷을 전송한다. 데이터는 1시간 단위로 전송되도록 설정하였으며 실험결과, 패킷 성공률은 약91.20%인 것을 확인하였다.
조영호,유벙전,서영환,조경상,김상도,정춘해 朝鮮大學校 附設 醫學硏究所 1992 The Medical Journal of Chosun University Vol.17 No.2
Polycythemia vera is one of the myeloproliferative diseases, and as such, is an example of clonal hematopoiesis. The progeny of a single, abnormal, hematopoietic stem cell gain a grwoth advantage over their normal counterparts resulting in overproduction of red cells generally accompanied by overproduction of granulocytes and platelets as well. There are a variety of nonspecific symptoms at onset related to the increased red cell mass and hematocrit accompanied by the more specific manifestations of pruhtis, erythromelalgia, and hepatic, portal, and mesenteric vein thrombosis. Splenomegaly and hypertension are common. Thrombosis and leukemia are frequent complication in polycythemia vera and are associated with severa organ damage and a high mortality. We report here the case of occurrence of myocardial and cerebral infarction in a patient with polycythemia vera.
마이크로 콘트롤러를 사용한 극배치 PID 자기동조기의 구성
하재해,추연규,임영도,최부귀 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.2
In this paper, a speed controller using one-chip microcontroller is implemented and applied to a DC Servo Motor. Adaptive control is applied to a system for which a priori knowledge to its mathematical model is insufficient, on the basis of input and output data an apropriate controller is constructed through which the system input is synthesized. The pole-placement PID self tuning control algorithms as a control algorithm is used to research the performance of the controller through experiments.
循環 흐름을 가진 固定層 反應器의 不安定性에 관한 硏究
梁海永,韓道興,李明浩 嶺南大學校 工業技術硏究所 1993 工業技術硏究所論文集 Vol.21 No.1
In this study we observed the possible existence of multiple steady states for CO oxidation over Pt/Boehmite catalysts, which is one of instabilities, and also analyzed numerically these phenomena with some proper reactor models. The form of our reactor was a non-adiabatic fixed bed with recycle. The reactor models include both one phase model with plug flow and two phase model with heat transfer resistance between gas phase and solid one. Especially, it was attempted to explain the multiplicity features with a very wide region, whose features could not have been clearly explained by means of any other model, by the modified two phase model which includes a term related with memory effect of catalyst temperature. The experiments showed that the effect of recycle ratio on multiplicity region could not be revealed definitely for our experimental conditions. This may arise from the facts that the multiplicity for the CO oxidation over Pt/Boehmite cataysts resulted mainly from strong heat transfer limitation rather than from mixing effect related with recycle flow since the CO oxidation was a reaction with both very high generation and rapid reaction rate.