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고농도 과산화수소 기반 유압시스템의 위치제어를 위한 PID 제어기 설계
류가람(Ga Ram Ryu),홍득의(Deuk Eui Hong),한승호(Seung Ho Han) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
The purpose of this paper is to design a PID controller for effective position control of hydraulic cylinder based by the high density liquified hydrogen peroxide. A widely used PID control structure is applied to the hydraulic system, where proper PID control gains are obtained by position control using experimental trialand-error method. in next step, A neural network is employed to generate appropriate PID control gains. Here the PID gains based on the trial-and-error method are used as training data. In this study, several series of simulation were carried out to find that the performance of the designed controller using the neural was more great than the conventional PID controller in terms of faster position control.
류가,류하문 중국사학회 2012 中國史硏究 Vol.76 No.-
일본이 투항하기 전후하여 국민정부는 서로 다른 계통으로 다양한 접수 계획을 설정하였는데, 이것은 그 중 하나이다. 이 계획은 조동방(趙連芳)이 제정한 것으로 일본이 투항한 직후 제정된 것으로, 비교적 구체적인 접수 방안을 담고 있다. 이 방안은 1945년 3월 제정한 "u대만접관계획강요(臺灣接管計劃綱要)"v와는 다르지만, "u대만접관계획강요"v에서도 접수 구상에 중시되었다. 이 "u수복계획대강"v은 일본이 이미 투항을 한 이후 구체적인 접수 방안이어서, 정수 작업의 정권 조직, 치안 유지 및국군 병력 배치 진용 등이 잘 짜여 있다. 이 자료는 1945년 전후 국민정부가 대만을 접수 하기 위한 공작이 어떠했는지를 연구하는데 중요한 자료이다.
토루 타케미츠 음악에서의 드뷔시 영향 연구 -작품 「그리고 그것은바람이었다(そして、それが風であることを知った)」를 중심으로
류가일,조대명 인문사회 21 2023 인문사회 21 Vol.14 No.3
This study aims to confirm the influence of French composer Debussy in the music of Toru Takemistu, a contemporary Japanese composer. The method of researching the background factors that influenced Takemistu’s music was through literature. Then, the study progressed to find out the influences of Debussy on the music of Takemistu as a way of analyzing the score, a piece for And Then I Knew ’twas Wind(1992). The consideration of background factors that influenced Takemistu’s music was in three aspects; biography, socio-culture, and musical background. As a result, the social, cultural, and musical circumstances surrounding Takemitsu, such as being in the war when he was born, the situation of Contemporary Japanese music society, and the music of Western composers, provided many options to create his music.The analysis of the work revealed that among the several options Takemitsu selectively accepted the influence of Debussy in musical elements, for example, the quotation of Debussy’s melody, the expression of timbre orchestration, the Hexa scale derived from the Wholetone scale, and the expended harmonies. An in-depth analysis of Takemitsu’s works remains a future task.
Performance Evaluation of a Vane Motor Driven by Liquefied Hydrogen Peroxide
홍득의,류가람,이권희,한승호 한국정밀공학회 2013 International Journal of Precision Engineering and Vol.14 No.7
Liquefied hydrogen peroxide has attracted attention as a mono-propellant energy source for systems that require a simple, lightweight structure. Its application has been extended to aerospace and deep-sea submarine systems, because this system has no need of an oxidizer and no hazardous products are discharged. For further industrial applications, however, a feasibility study should be carefully conducted with respect to power-supply efficiencies such as specific power density. In the present study, a prototype of a vane motor driven by liquefied hydrogen peroxide with a high density (95%) was developed and performance characteristics such as the specific power density were estimated by measuring the pressure and rotation speed of the vane motor, and by numerical simulation using FSI (Fluid-Structure-Interaction) analysis. The obtained specific power density reached 0.02 kW/kgf, which approximates the levels of the most up-to-date fuel cells.
Small-cell Neuroendocrine Carcinoma of the Extrahepatic Bile Duct: A Rare Case Report
한보라,서윤진,오규희,류가람,마건영,김기현,노명균,주영은 대한소화기학회 2023 대한소화기학회지 Vol.81 No.3
Neuroendocrine carcinoma (NEC) arising from the extrahepatic bile duct is extremely rare and commonly mistaken for cholangiocarcinoma. Therefore, NEC of the bile duct is difficult to diagnose preoperatively. Previously reported cases were resected with a diagnosis of cholangiocarcinoma and diagnosed with NEC after surgery. This paper reports an 84-year-old female with small-cell NEC of the extrahepatic bile duct, confirmed by a biopsy from an ERCP, with a review of the relevant literature. Contrast-enhanced abdomen computed tomography and magnetic resonance cholangiopancreatography revealed an approximately 1.7 cm enhancing intraductal mass in the proximal common bile duct with dilatation of the upstream bile duct. ERCP showed a long strictured segment in the proximal common bile duct with bile duct dilatation. A biopsy was performed at the site of the stricture. Histological examinations and hematoxylin–eosin staining showed the solid proliferation of small tumor cells with irregularly shaped hyperchromatic nuclei. Immunohistochemical examinations showed that the tumor cells were positive for CD56 and synaptophysin. Small-cell NEC of the extrahepatic bile duct was confirmed based on the histology and immunohistochemistry findings. The patient and their family denied treatment because of the patient’s old age.
홍득의(Deuk Eui Hong),류가람(Ga Ram Ryu),안대균(Dae Gyun Ah),한승호(Seung Ho Han) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Recently, there is very high demand of a wearable robot which enables to perform works under a severe environment such as field operation and maneuver under water. Since it should have a simple structure with light weight, an appropriate power generating system i.e. type of strap-on strength is required. Monopropellant such as a liquified hydrogen peroxide is drawing attention as this type of power generating energy source. The liquified hydrogen peroxide is attracted due to its outstanding applicability to the wearable robot because it doesnt require an oxidizer and discharge a hazardous product. For the further industrial applications, however, a feasibility study should be carried out carefully in the aspect of the specific power density. In this study, a prototype of vane motor driven by the liquified hydrogen peroxide with high density upper 90% was developed, and its performance characteristic such as a specific power was estimated. The specific power density obtained by numerical simulation using FSI analysis supported by experimental results was up to 0.055kW/kgf, which reaches at the level of the latest developed fuel cell.