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조절 및 비조절 하천의 어류 서식처 개선을 위한 성장 단계별 가중가용면적 분석 및 최적 환경생태유량 산정
정상화,지운,김규호,장은경 한국수자원학회 2019 한국수자원학회논문집 Vol.52 No.S-2
Environmental flows in the downstream sections of Yongdam Dam, Wonju Stream Dam, and Hongcheon River were estimated with selected target fish species such as Nigra for the site of Yongdam Dam, Splendidus for the site of Wonju Stream Dam, and Signifer for the site of Hongcheon River by considering endangered and domestic species. Physical habitat analysis was performed to estimate environmental flows for the study sites by applying the Physical Habitat Simulation (PHABSIM) and RIVER2D which combined hydraulic and habitat models. Based on the monitored data for ecological environment, the Habitat Suitability Index (HSI) for the target species was estimated by applying the Instream Flow and Aquatic Systems Group (IFASG). In particular, based on the result of fish monitoring, the HSI for each stage of the growth for target species was analyzed. As a result, the Weighted Usable Area (WUA) was maximized at 4.9 m3/s of flow discharge during spawning, 5.8 m3/s during the period of juvenile, and 8.9 m3/s during the adult fish season at the downstream section of Yongdam Dam. The result of the Wonju Stream Dam showed an optimal environmental flow of 0.4 m3/s, 1.0 m3/s, and 1.5 m3/s during the period of spawning, juvenile, and adult. The habitat analysis for the site of Hongcheon River, which is a non-regulated stream, produced an optimum environmental flow of 5 m3/s in the spawning period, 4 m3/s in the juvenile stage and 6 m3/s in the adult stage. 본 연구에서는 용담댐 하류, 원주천댐, 홍천강을 대상으로 환경생태유량을 산정하였으며, 멸종위기종 및 국내고유종을 고려한 대상어종으로 용담댐 하류는 감돌고기, 원주천댐은 쉬리, 홍천강은 묵납자루를 선정하여 각 하천에서 환경생태유량을 산정하였다. 환경생태유량을 산정을 위한 물리서식처 분석은 수리모형과 서식처 모형이 결합된 Physical Habitat Simulation (PHABSIM)과 RIVER2D를 적용하여 수행하였다. 생태 환경 모니터링을 통해 연구 대상지별 대상종의 서식처 적합도 지수를 Instream Flow and Aquatic Systems Group (IFASG) 방법을 적용하여 성장단계별 서식처 작합도 지수를 산정하였다. 특히 어류 모니터링 성과를 바탕으로 대상종의 성장단계별 서식처 적합도 지수를 산정하였다. PHABSIM을 활용한 분석 결과, 조절 하천인 용담댐 하류에서 산란기에는 4.9 m3/s, 치어기 5.8 m3/s, 성어기에는 8.9 m3/s에서 가중가용면적이 최대인 최적 환경생태유량이었다. 원주천댐에서는 쉬리의 산란기에는 0.4 m3/s, 치어기에는 1.0 m3/s, 그리고 성어기에는 1.5 m3/s의 최적 환경생태유량을 나타내었다. 또한 비조절하천인 홍천강에서는 묵납자루의 산란기 5 m3/s, 치어기 4 m3/s, 그리고 성어기에는 6 m3/s의 최적 환경생태유량이 산정되었다.
다채널 광정렬 장치에서의 다자유도 회전 스테이지 동작 특성에 관한 연구
정상화,차경래,최석봉,김광호,박준호,이경형 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
In recent years, as the demands of VBNS(Very high speed Backbone Network Service) and VDSL(Very high-data rate Digital Subscriber Line) increase, the development of kernel parts of optical communication such as PLC(Planar Light Circuit), Coupler, WDM elements increase. The alignment and the attachment technology are very important to fabricate the optical elements for communication. In this paper, the mechanism of rotational stage, the contact sensing unit, and integrated control circuit for the optical alignment system are studied.
강제공냉 차동식 형상기억합급 액츄에이터의 동작특성에 관한 연구
정상화,김현욱,차경래 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-
In the recent years, as the research and the development of micro and precision machinery become active, the interest of micro actuators using SMA(Shape Memory Alloy) has been increased. The dynamic characteristic analysis of SMA is necessary for actuator application and many common researches report the material characteristics of SMA sufficiently. However, the research on dynamic characteristics is very deficient. In this paper, the helical spring are fabricated with NiTi SMA wire of high resistivity. The force, response speed, temperature, and displacement are measured by digital force gauge, infrared thermometer, and laser displacement sensor so that the dynamic characteristics of this SMA is analyzed. Also, bidirectional actuator was fabricated and experimented for its performance.
초음파 이송 시스템에서 Flexural Beam의 형태 변화와 물체 이송과의 관계에 대한 연구
정상화,신병수 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-
In the semiconductor and the optical industry a new transport system which can replace the conventional sliding system is required. These systems are driven by magnetic field and conveyer belt. The magnetic field damages semiconductor and contact force scratches the optical lens. The ultrasonic wave driven system can solve these problem. In this paper, the object transport system using the excitation of ultrasonic wave is proposed. The experiments for finding the optimal excitation frequency, finding phase-difference between two ultrasonic wave generators are performed. The relationship of transporting speed according to the change of flexural beam shape is verified and the system performance for practical use is evaluated.
정상화,차경래,김현욱,최석봉,김광호,박준호 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
In recent years, as the demands of VBNS and VDSL increase, the development of kernel parts of optical communication such as PLC(Planar Light Circuit), Coupler, and WDM elements increases. The alignment and the attachment technology are very important in the fabrication of optical elements. In this paper, the optical alignment characteristics of multi-axis ultra precision stage were studied. The alignment algorithms were studied for applying to the ultra precision multi-axis stage. The alignment algorithm is comprised of field search and peak search algorithms. The contour of optical power signals can be obtained by field search and the precise coordinate can be found out by peak search. Two kinds of alignments, such as 1ch. input vs. 1ch. output optical stack, and 1ch. input vs. 8ch. output PLC stacks were performed for investigating the alignment characteristics.
초경합금 소재 LCU_CL 코어의 초정밀 연삭 특성에 관한 연구
정상화,차경래,김현욱,이봉주 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
As the various manufacturing technology of optical glass is developed, the aspherical lenses are applied to many fields. However, It is still very difficult to manufacture glass lens because of the high cost and the short life of core. In recent years, the demands of the aspherical glass lenses increase since it is difficult to obtain the desirable performance in the plastic lens. In the glass mold lens, it has merits of high productivity and reproductivity since lens is manufactured by the only forming with high precision mold. The fabricating conditions for glass mold lens are glass surface that does not cause fusion, viscosity of 108-1013 poise for the 0.2㎛ accuracy, and viscoelasticity for the roughness less than 100 angstrom. In this thesis, ultra-precision grinding characteristics of tungsten carbide for forming the aspherical glass lens core were studied and the result of it is applied to manufacture the tungsten carbide-base core of the glass lens used to the laser scanning unit and the camera phone.
차동식 형상기억합금 액츄에이터의 동작성능 향상을 위한 연구
정상화,김현욱 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.1
In the recent years, as the research and the development of micro and precision machinery become active, the interest of micro actuators using SMA(Shape Memory Alloy) has been increased. The dynamic characteristic analysis of SMA is necessary for actuator application and many common researches report the material characteristics of SMA sufficiently. However, the research for dynamic characteristics is very deficient. In this paper, the helical spring are fabricated with NiTi SMA wire of high resistivity. The force, response speed, temperature, and displacement are measured by digital force gauge, infrared thermometer, and laser displacement sensor so that the dynamic characteristics of this SMA is analyzed. Also, bidirectional actuator was fabricated and experimented for its performance.