• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.474-474
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• 2017

대하천 사업 이후 국내에서 경험하지 못한 대규모 다기능 보가 설치되었으며, 이로 인해 기존 하천에 서식하던 어류들의 군집, 이동 및 환경의 변화가 발생할 수 있으며, 산란을 위해 상류로 이동하거나 하류로 이동하려는 어류들에게는 상당히 큰 문제를 야기할 수 있다. 이러한 문제점들을 최소화하기 위해 다기능 보에는 대규모 어도가 설치되었으며, 다양한 흐름해석 모형을 이용하여 어도의 유인효율평가에 대한 연구가 이루어지고 있으나 이를 검증할 수 있는 실험적 연구는 부족한 실정이다. 어도의 유인효율평가에 있어 어도입구부 유속장 측정이 중요하다. 하지만 어도 입구부에 대한 접근성은 용이하지 못 할 뿐만 아니라, 기존에 사용하던 ADCP 장비로는 유속장 측정에 한계가 있다. 이를 극복하기 위해 드론영상을 활용한 LS-PIV기법과 GPS전자부자를 활용할 필요가 있다고 판단하였고, GPS전자부자를 어도 입구부에서 일정시간 유하시키는 동시에 드론영상촬영을 활용해 LS-PIV기법을 적용하여 유속을 측정하였다. 그 결과 LS-PIV기법을 적용한 실험이 주 흐름영역에서 안정적인 결과를 보였다. 본 실험 결과를 통해 새로운 유속 계측 방안을 보여줌으로써 접근성 및 안전성에 대한 효율적인 실험계측 방법을 제시하리라 사료된다.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1997.10a
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• pp.243-247
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• 1997

기존의 복합 Turning Center 보다 비구심상태에서의 가공, 3축밀링가공 및 3축/4축 동시 Milling가공 등의 특징을 갖고 복잡한 형상과 기능을 갖도 있는 부품 생산용 각형 FMS/C의 기본기계가 될 다기능 복합가공기[최대가공경 310mm *최대가공길이600mm, 6축제어(4축동시가공), ATC Magazine 20개, 주축18.5KW, 제2주축 15KW 회전수36-1,600RPM의 강력, 고속, 정밀 다기능 복합가공기]를 제2차 선도기술개발사업을 통해 개발을 추진하고 있다.

• Ecology and Resilient Infrastructure
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• v.7 no.4
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• pp.308-319
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• 2020

In this study, the field applicability of the recently constructed multifunctional fishway in Seomunbo, Yeongcheon-si, and Gyeongsangbuk-do were examined. The analysis variables were R/C slab (S1) and R/C+S/C slab (S2), the underground passage standard areas (width × length) were 1.4 m × 0.2 m, 1.4 m × 0.3 m, and 1.4 m × 0.6 m, and the flow velocities were 0.8, 1.2, and 1.6 m/s. As a result of the analysis, the safety of the design of Seomunbo was evaluated. The analysis showed compared to the Seomoon Weir fishway, the maximum stress of S2 decreased by 24 - 32%, the bending moment of the underground passage decreased by 16 - 33%, the maximum stress of the sidewall decreased by 20 - 36%. In addition, the bending moment of the upper slab decreased by 17 - 33%, the maximum stress of the upper slab decreased by 9 - 28%, and the bending moment decreased by 19 - 33%. Complementation was required in the following percentages: 18% and 14% for the maximum stress and bending moment of the underground passage, respectively, 15% and 17% for the maximum sidewall stress and bending moment, respectively, and 11% and 16% for the upper slab maximum stress and bending moment, respectively. The results showed that S2 was superior to that of the Seomoon Weir fishway, and the underground passage size of 1.4 m × 0.3 m was superior to those of 1.4 m × 0.2 m and 1.4 m × 0.6 m, and R/C+S/C slab was superior to that of R/C slab. The findings are expected to be useful for constructing and designing the multifunctional fishway.

• 환경사랑
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• s.42
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• pp.4-5
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• 2005

향후 건축자재 분야에도 국제표준화기구(ISO)의 환경라벨 및 선언제도의 제3유형인 환경성적표지제도가 도입될 것이 예상되며 이러한 제도는 기본적으로 LCA에 의한 환경평가에 근거하도록 되어 있다. 미래의 건축자재에 요구되는 성능은 초경량, 고강도, 다기능, 복합, 고성능, 건강, 정보화, 지능형, 시스템이라는 수식어 아래에서 진행될 것이다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.489-490
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• 2021

본 연구에서는 해양사고 처리 중 발생하는 인명사고 발생률을 감소시키고, 효율적으로 양식장을 관리하는 것을 전제로 카메라와 센서를 다기능 해양탐사 로봇에 적용하고자 한다. 현재의 양식장 관리 시스템은 수온 체크만 할 수 있게 되어있다. 이러한 시스템은 양식어에게 적합한 환경을 제공해주기 쉽지 않다. 본 논문은 이러한 문제점들을 개선하기 위해 기존의 해양 처리시스템과 양식 시스템 대신 카메라와 수온 센서, pH 농도 센서, 초음파 거리 센서, DC 모터, 블루투스 모듈을 적용한 다기능 해양탐사 로봇 기술을 제안한다. 기존의 시스템과는 다르게 안전하고 효율적으로 환경을 분석하고, 제어할 수 있다.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 1993.07a
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• pp.101-105
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• 1993

해안구조물의 설계는 안정성과 경제성을 위주로 하던 1세대적 관점에서 친수성 개념을 도입한 2세대적 관점으로 발전되었고, 최근 여기에 생태계 제어를 포함시키는 3세대적 설계관으로의 발상 전환이 요구되고 있다. 즉, 해안의 보호와 친수성 공간 제공뿐 아니라 자원조성 효과에 의해 연안역의 부가가치를 높히는 다목적, 다기능 연안역 개발 구상이 필요하다. (중략)

• Journal of the Semiconductor & Display Technology
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• v.21 no.4
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• pp.126-131
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• 2022

The number of joint disease patients is increasing every year. Currently, the most CPM(Continuous Passive Motion) equipment uses expensive imported equipment, and one CPM equipment is designed to be used only in one joint, medical personnel or hospitals who are the main users of the medical equipment need to have several types of CPMs for joint rehabilitation. To solve this problem, this paper designed a multifunctional joint medical equipment that enables rehabilitation of knee, shoulder, and elbow joints in one CPM equipment and includes general, intensive, and adaptive exercise functions for effective treatment according to the patient's condition. The patient's condition was diagnosed using a load cell and a current sensor. In this paper, effective rehabilitation methods were presented and high reliability and precision of medical equipment was confirmed through experiments using potentiometer, encoder, and PI controller.

• Journal of the Korean Society for information Management
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• v.19 no.1
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• pp.135-161
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• 2002

This study presents a multilingual integrated ontological approach that enables linking classification systems. thesauri. and terminology databases in science and technology for more effective indexing and information retrieval online. In this integrated system, we designed a thesaurus model with concept as a unit and designated essential data elements for a terminology database on the basis of ISO 12620 standard. The classification system for science and technology adopted in this study provides subject access channels from other existing classification systems through its mapping table. A prototype system was implemented with the field of nuclear energy as an application area.

• Journal of the Korea institute for structural maintenance and inspection
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• v.18 no.6
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• pp.50-59
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• 2014

In this paper, Reinforced concrete (R/C) and R/C+steel plate concrete slab was carried out by SAP2000 software program in order to compare the stability of the multi-functional fishway, that is Bonggok fishway, built at Bonggok river recently in Gumi city, when the size of underground passage is $1m{\times}0.2m$, $1m{\times}0.4m$, $1m{\times}0.6m$ and the velocity is 0.8m/s, 1.2m/s, 1.6m/s respectively for the S2 (R/C+S/C). The analysis shows the maximum stress of S2 decreases less 26~50% than that of Bonggok, bending moment of sidewall decreases less 28~54%, maximum stress of side wall decreases less 17~31%, bending moment of upper slab decreases less 24~47%, maximum stress of upper slab decreases less 4~20%, and bending moment decreases less 10~27% than that of Bonggok. The complementation is required as much as the following percent; 27% and 25% for the maximum stress and bending moment of underground passage, 15% and 24% for the side wall maximum stress and bending moment, and 10% and 14% for the upper slab maximum stress and bending moment, respectively. This result shows that the S2 is greatly superior to that of the Bonggok fishway, and underground passage size of $1m{\times}0.4m$ is superior to that of $1m{\times}0.2m$ or $1m{\times}0.6m$, and R/C+S/C slab is superior to that of R/C slab. This result is expected to be the basic data for the construction and design of the multi-functional fishway.

• Journal of The Korean Society of Agricultural Engineers
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• v.59 no.1
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• pp.97-107
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• 2017

In this study, the validity and applicability of the multipurpose fishway which has been constructed for the upstream migration of fish at Chuksan river in Uljin is assessed and analyzed by a commercial software. The upper slab types of fishway in this investigation are reinforced concrete slab (S1 type) and reinforced concrete slab with steel plate (S2 type). The three different sizes of subway passage ($0.8m{\times}0.1m$, $0.8m{\times}0.2m$, $0.8 m{\times}0.3m$) and velocities (0.6 m/s, 1.2 m/s, 1.8 m/s) of Chuksan fishway was investigated and compared for the Chuksan in government design code. The analysis showed that the maximum stress and bending moment of S1 type decreased 1~21 % and 12~27 % compared to the Chuksan in government design code, respectively. Also, the maximum stress of and bending moment of S2 type decreased 11~32 % and 27~39 %. From the numerical analysis, it was found that the S2 type was greatly effective and the subway passage size of $0.8m{\times}0.2m$ was most safe. This result can be utilized to be the basic data for design of the Multipurpose fishway.