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조장현,오현석,신민섭 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.4
This paper is concerned with the optimal design of hyperbaric oxygen therapy system chamber with separated rooms for multi-users using stress analysis. Hyperbaric oxygen therapy is very important medical remedy for increasing the concentration of melted oxygen in human and animal body to recover the impaired cell for the healthy condition. This research proposed the proper procedures to design the physical specifications and investigate the mechanical design safety of hyperbaric oxygen chamber with two separated rooms using computational stress analysis with Solidworks program. The result of this research will be used to make the real size model of practical hyperbaric oxygen therapy system for multi-users with separated chamber.
조장현,김준규,남예지,노충근,정윤호,주진식 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.2
In this paper, considering the limits of existing smart pots, we introduce the research result of the new smart pot that can easily grow various pet plants. Through Arduino control kit which is the one of the open source computing platform, electric circuit and equipment to fulfil the functions of the smart pot is newly designed and made. Especially the head of pump which is main function in smart pot and the structure of electric equipment is theoretically calculated and Finite Element Analysis (FEA) tool is used for static analysis to prevent damage to the pots. After that, new smart pot is made with the researched design materials and perform the various functional investigations to grow the indoor plants.
실습 교육용 유연 생산시스템 설계 및 제작에 대한 연구
조장현 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.3
This is the research report concerned with designing and making of the flexible manufacturing system for educational training. The flexible manufacturing system is composed of several mechatronic(mechanical and electronic) subsystems which are automatically controlled by computer program. The main subsystems are materials feeder unit, automatic guided vehicle, robot for moving parts, indexing and stamping unit and computer system and more subsystems can be added for specific manufacturing processes. This dissertation includes the design and production characteristics of flexible manufacturing system for educational training. Finally, the educational training equipment is made and demonstrated in this research and is expected to use in various educational institutions, for example, technical educational and practical industrial training institutions.
시간 주기 시스템의 안정성 및 제어기 설계에 대한 연구
조장현 한국기계기술학회 2021 한국기계기술학회지 Vol.23 No.5
This is the research report concerned with the new stability concept and designing the controller of the time periodic systems. The periodic systems which is governed by time is very common in various type of dynamic systems. For example, the satellite is the large scale and the experimental test equipment as pendulum is also time periodic systems. The motion of the systems during the time interval is running repeatedly. While this periodic systems is running, the dynamic stability is important to behave the appropriate motion of the system's function. This research propose the new stability approach based on Lyapunov theorem which is analyzing the system's stability adapting the specific energy function. And also this research introduces the developing numerical procedures to retain the stability of time periodic system. Finally, the result of this research is very useful to judge the stability and design the controller of time periodic system.
응력해석을 통한 다인용 고압산소치료기 챔버의 역학적 설계에 관한 연구
조장현,안현준,허내강,오현석 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.1
This paper is concerned with the mechanical design of hyperbaric oxygen chamber for multi-users using stress analysis. HBOT(Hyperbaric Oxygen Therapy) is very effective medical equipment for increasing the concentration of melted oxygen in human and animal body. The hyperbaric oxygen supplies to the impaired cell of human and animal to recover the healthy condition. This research reported the design specifications and mechanical safety of hyperbaric oxygen chamber using computational stress analysis with CATIA program. The result from this research can be used for making the practical HBOT equipment for multi-users and to manufacture the real model.
여기광원의 출력 변화에 따른 AlGaAs/GaAs 양자우물구조의 Photoluminescence 광특성 분석
조장현,정용섭,변지수,송진동,이은혜 한국물리학회 2014 새물리 Vol.64 No.2
MBE 방법으로 성장시킨 AlGaAs/GaAs 다중양자우물구조에서 여기광의 출력 변화에 따른 광발광 (photoluminescence, PL) 특성을 분석하였다. n-type GaAs 기판위에 GaAs버퍼층을 형성시킨 후 AlGaAs/GaAs를 번갈아 가며 성장시킨 시료에 여기광의 출력을 20 mW에서 140 mW까지 변화시키며 측정하였다. 803 nm, 812 nm에서 2개의 PL 봉우리 파장이 관측되었으며, 여기광의 출력이 증가함에 따라 PL 세기가 선형적으로 증가하였고, PL 봉우리 파장이 5 nm 정도 적색편이가 나타났다. 적색편이현상의 주원인은 여기광 세기의 변화에 따른 AC Stark 효과에 의한 에너지 밴드구조의 변이로 예상되며, 이러한 결과는 AlGaAs/GaAs 다중양자우물구조 응용소자의 개발 및 활용에 있어 실제 구동 시소자의 상태와 성능을 예측해 볼 수 있는 중요한 기초정보를 제공할 것으로 기대된다. We fabricated AlGaAs/GaAs multiple quantum wells by using molecular beam epitaxy (MBE). We deposited a GaAs buffer layer on a n-type GaAs wafer and stacked AlGaAs and GaAs layer by layer 20 times. The optical properties of the AlGaAs/GaAs multiple quantum wells were analyzed by using photoluminescence (PL) spectroscopy. By increasing the excitation power from 20 mW to 140 mW, we observed 2 PL peaks, on each at 803 nm and 812 nm; the PL intensity increased linearly with increasing power, and the peak wavelengths shifted to longer wavelengths by about 5 nm. We expect that the observed red shifts originate from the AC Stark effect by which the local energy band structure changes momentarily in response to the optical excitation field. The results show the possibility of bandgap engineering by external excitation, providing key information on the functionality of AlGaAs/GaAs multiple quantum wells for developing device applications.