• Journal of the Korean Society of Radiology
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• v.13 no.3
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• pp.407-414
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• 2019

Recently, after the reorganization as the basis of NCS education, various learning methods are being sought for improving the basic occupational ability and job ability required by NCS, and the evaluation method accordingly is urgently needed. The purpose of this study was to evaluate the applicability of meta-cognitive learning and Havruta learning as evaluation cases in order to improve the job skills and basic skills required in the NCS curriculum. As a result, the meta-cognitive learning response sample statistic showed an average of 2.6883 when the pre-meta-cognitive learning questionnaire was a 5-point scale, and an average of 4.2468 after the meta-cognitive learning questionnaire. The correlation coefficient was 0.782 and the significance probability was 0.045. In the case of the Havruta learning correspondence sample statistic, the average of 3.1515 when the preliminary Havruta learning questionnaire was a 5 point scale and the average of the post-Havruta learning questionnaire was 4.3853, which was improved by 1.23 points. The correlation coefficient was 0.631 and the significance probability was 0.049. Meta-cognitive learning and Havruta learning were found to be correlated. The mean of meta cognition was 3.4675 and the mean of Havruta was 3.7684. Metacognitive learning and Havruta learning were -0.042 And there was no statistically significant difference. Therefore, the learning method to improve the job ability should be applied considering the characteristics of the subject.

• KIPS Transactions on Software and Data Engineering
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• v.5 no.6
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• pp.267-272
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• 2016

Microscope cell image is an important indicator for obtaining the biological information in a bio-informatics fields. Since human observers have been examining the cell image with microscope, a lot of time and high concentration are required to analyze cell images. Furthermore, It is difficult for the human eye to quantify objectively features in cell images. In this study, we developed HCS algorithm for automatic analysis of cell image using an OpenCV library. HCS algorithm contains the cell image preprocessing, cell counting, cell cycle and mitotic index analysis algorithm. We used human cancer cell (MKN-28) obtained by the confocal laser microscope for image analysis. We compare the value of cell counting to imageJ and to a professional observer to evaluate our algorithm performance. The experimental results showed that the average accuracy of our algorithm is 99.7%.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.277-277
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• 2015

본 연구는 퍼클로레이트의 생물학적 환원 과정에 있어서 나이트레이트의 존재가 미생물에게 어떤 영향을 미치는지를 실험을 통해서 알아보고 적절한 모델링 접근을 통하여 나이트레이트의 퍼클로레이트 환원에 대한 저해의 정량적 분석을 위한 요소들을 도출하기 위해 수행되었다. 100mL 합성폐수를 포함하는 플라스크를 이용한 실험이 수행되었고, 유일 탄소원으로 아세트산나트륨이 사용되었고, 전자수용체로는 퍼클로레이트와 나이트레이트가 사용되었다. 먼저 퍼클로레이트와 나이트레이트 각각을 단일전자수용체로서 넣은 실험을 진행하였다. 퍼클로레이트의 동역학계수 qmax, Ks, Y, b값은 각각 0.9(mgClO4-/mgMLSSday), 42.28(mgClO4-/L), 0.382(mgClO4-/mgMLSS), 0.05(day-1)로 계산되었다. 그리고 나이트레이트의 동역학 계수 qmax, Ks, Y, b값은 각각 13.81(mgNO3-/mgMLSSday), 239.78(mgNO3-/L), 0.275(mgNO3-/mgMLSS), 0.05(day-1)로 계산되었다. 나이트레이트와 퍼클로레이트를 동시에 넣었을 경우에는 나이트레이트의 동역학 계수는 qmax, Ks, Y, b 값은 각각 13.72(mgClO4-/mgMLSSday), 235.64(mgClO4-/L), 0.263(mgClO4-/mgMLSS), 0.05(day-1)로 큰차이 없었으나, 퍼클로레이트의 경우에는 qmax, Ks, Y, b값은 각각 0.6(mgClO4-/ mgMLSSday), 42.24(mgClO4-/L), 0.393(mgClO4-/mgMLSS), 0.05(day-1)로 qmax값은 감소하였고, Y값은 증가하는 모습을 보임으로써, 나이트레이트의 존재가 퍼클로레이트의 환원을 저해시키는 것을 확인할 수 있었다.

• Journal of Korean Society of Disaster and Security
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• v.16 no.1
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• pp.81-89
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• 2023

Recently, due to global warming and urbanization due to the influence of abnormal weather, weather changes are increasing worldwide. Various measures have been proposed to reduce flood damage as flood volume increases due to problems such as an increase in impermeable area due to urbanization and reckless development. In this study, flow characteristics and overflow volume were analyzed using FLOW-3D, a three-dimensional CFD model, in accordance with changes in the cross-flow weir inlet angle installed in the meandering river section, and a basic study was conducted to evaluate the overflow capacity and calculate the flow coefficient. As a result of the analysis, the smaller the inflow angle of the transverse overflow, the lower the water level and flow rate of the main water flow after passing the transverse overflow, and the higher the inflow angle, the higher the water level and the flow rate. In addition, it was confirmed that the direct downstream flow rate decreased compared to the upstream flow rate when the inflow angle of the transverse overflow was 40° or higher.

• Journal of the Korean Geotechnical Society
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• v.31 no.12
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• pp.29-43
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• 2015

In this study, engineering property tests were conducted for cement milk used as a filling materials in the bored piles method. For this purpose, various water/cement ratio specimens were produced on the basis of standard specimen specified in highway corporation specifications. The unconfined compressive strength, point load strength, elasticity modulus, poisson's ratio test was performed according to the age. As a test result, injection height for productions of cement milk specimens was defined ratios. Correlation coefficient K of the unconfined compressive strength and point load strength were $K_7=4.55{\sim}13.65$ in age 7 days, and $K_{28}=5.28{\sim}16.84$ in age 28 days. When water / cement ratio is 65-150%, the elastic modulus and Poisson's ratio significantly increased and decreased regardless of age. In addition, the formulae were proposed for unconfined compressive strength, point load strength, a correlation coefficient of unconfined compressive strength, point load strength, elastic modulus, and poisson's ratio for each age.

• Journal of the Korean Society of Clothing and Textiles
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• v.27 no.12
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• pp.1374-1380
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• 2003

본 연구의 목적은 의복의 기능성 측정의 객관적 평가를 위한 관절각도측정의 방법들 간에 상관관계를 분석하고, 컴퓨터를 이용한 측정방법을 개발, 이를 기존의 방법과 비교, 분석함으로써, 의복의 기능성 측정 및 기능적 디자인 개발에 기여함에 있다. 미국 Kansas 지역의 전문 소방수를 대상으로, 선택된 10가지 실험동작에서의 관절각(range-of-motion)을 computer-aided method, Leighton flexometer, goniometer를 사용하여 측정하였으며, 측정순서는 무작위 순서(random order)로 하였다. 독립변인으로는 3종류의 측정방법(computer-aided method, flexometer, goniometer)이며, 종속변인으로는 선택된 동작에서의 관절각(range-of-motion)이다. 또한 상관분석(correlation analysis)을 실시하여, 상관계수(correlation coefficient)를 측정한 통계처리결과, 각 측정방법들 간에 긍정적이며 유의적인 상관관계가 있는 것으로 나타났다.

• Transactions of the Korean Society of Mechanical Engineers
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• v.7 no.1
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• pp.110-121
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• 1983

ASHRAE 표준을 참고로 하여 한국과학기술원(KAIST)에서 수정한 집열기 시험 장치의 주요부품 의 설계도면 및 Specification 등을 제시하였다. 또한 ASHRAE 표준 시험 절차를 재분석하고 KAIST에서 수정한 Test Loop를 시험하기 위한 실험절차의 개요도 설명하였다. ASHRAE 표준 상의 가장 중요한 실험인 (1) 집열기 시간 상수 실험과 (2) 수직에 가까운 입사각에 대한 효율 실 험 및 (3) 입사각 수정 계수 실험 등을 실제 태양 아래에서 실험하여 그 결과도 그림으로 제시하 였다. 본 연구를 통해서 얻은 결과로부터 다음과 같은 결론을 얻을 수 있었다. 한국 과학 기술원 에서 설계한 집열기 시험 장치는 ASHRAE의 표준 절차에 따라 액체 가열식 집열기의 열효율을 측정하기 위한 실용적 장치임을 알 수 있다. 일반적으로 ASHRAE 표준 93-77은 합리적인 절차 라고 할 수 있다. 그러나, 최소일사량 규정(즉 630W/m$^{2}$ 미만이 되어서는 안된다고 하는 ASHRAE 규정) 같은 것은 일사량이 적은 기후 조건하에서는 다소 하향 조정하여도 정확한 효율 곡선을 얻을 수 있다고 하겠다.

• Proceedings of the KSME Conference
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• 2001.11b
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• pp.89-95
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• 2001

On-site diagnosis of chiller performance is an essential step for energy saving business. The main purpose of the on-site diagnosis is to predict the COP of a target chiller. Many models based on thermodynamics background have been proposed for the purpose. However, they have to be modified from chiller to chiller and require deep insight into thermodynamics that most of field engineers are often lacking in. This study focuses on developing an easy-to-use diagnostic technique that is based on adaptive neuro-fuzzy inference system (ANFIS). Quality of the training data for ANFIS, sampled over June through September, is assessed by checking COP prediction errors. The architecture of the ANFIS, its error bounds, and collection of training data are described in detail.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.993-997
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• 2007

본 연구에서는 새만금 유역을 대상으로 오염물질 배출상황을 보다 세부적인 수계의 분포에 따라 정량적으로 분석하고, 분석결과를 효과적으로 처리할 수 있는, 지리정보시스템을 이용한 오염총량 관리시스템을 개발하였다. 본 시스템은 (1) GIS 기반의 배출부하 데이터베이스를 구축하며, 배출부하량 및 세부적인 수계별 분포를 확인할 수 있는 검색 모듈과 (2) 자정계수와 유달거리로 구성된 유달함수를 통하여 유달부하 데이터베이스를 생성하는 모듈, 그리고 (3) 저류형, 침투형, 식생형, 장치/하수처리형 등의 비점오염 저감시설을 유역 말단에 설치하였을 경우, 소유역 및 새만금 유역전체를 대상으로 부하량 저감효과 및 삭감률이 계산 가능한 모듈로 구성되었다. 따라서 전문적인 지식이 없는 사용자도 결과의 판독이 가능하며, 대상유역의 부하량 분석 및 저감시설에 따른 부하량 예측을 통하여 수질정책 수립에 매우 유용한 도구로 사용되도록 하였다. 차후의 연구에서는 본 시스템과 수문/수질모델링시스템을 연계하여 종합적인 수질정보 및 수질관리를 위한 통합관리시스템의 지원이 가능하도록 할 예정이다.

• Journal of the Korean Society for Precision Engineering
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• v.14 no.4
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• pp.136-144
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• 1997

The characteristics of fatigue crack growth subject to out-of-plane bending fatigue are studied in terms of crack opening behavior by using pre-cracked smooth specimens. Crack opening stress is measured by an elastic compliance method which may precisely and continuously provide many date using strain gages during experiment. The results of the short crack and the long crack arranged by crack closure concept show that the effective stress gange ratio of short crack is grester than that of long crack, and ano- malous growth behavior of short crack may be elucidated by the variation of crack opening stress. When the variation of fatigue crack growth rate is arranged versus effective stress intensity factor range. Iinear relation is held also for the short crack. It shows that growth behavior of short crack can be quantitatively represent- ed by the fracture mechanics parameter using effective stress intensity factor range.