본 논문의 주 목적은 기존선형과 저항을 최소화하는 최적선형에 대한 에너지효율 성능을 평가하는 것이다. 설계 흘수와 설계 선속을 고려하여 대상선박의 선수부 형상을 검토하였다. 실제 운항 상태에서 대상선박의 저항성능을 평가하였다. 상용 전산유체역학(CFD) 코드와 수조 모형시험 자료는 유효마력 평가를 위해 사용되었다. 실제 운항 상태를 고려하여 최소저항을 가지는 최적선형을 제시하였다. 기존선형과 최적선형에 대하여 3가지 선속에서 유효마력을 추정하였다. 최적선형의 저항성능은 기존선형과 비교하여 볼 때 설계속도(12노 트)에서 약 6% 향상된 결과를 보여 주었다. 준추진효율 계수(ETAD, ηD)는 모형시험 자료를 활용하였다. 에너지 효율 성능은 년간 운항일 수, 벙커C유 가격, 1일 연료사용량 그리고 연료소비계수를 바탕으로 작성되었다. 최적선형의 에너지 효율 성능은 기존선형과 비교하였을 때 12노트에서 연간 약 3천만원 절약된 결과를 보여 주었다.

PURPOSES : The current practice in car headlight visibility performance evaluation is based on the luminous intensity and illuminance of headlight. Such practice can be inappropriate from a visibility point of view where visibility indicates abilities to perceive an object ahead on the road. This study aimed at evaluating the appropriateness of current headlight evaluation methodMETHODS: This study measured the luminance of object and road surface at unlit roadways. The variables were measured by vehicle type and by headlight lamp type. Based on the measurements, the distance where drivers can perceive an object ahead was calculated and then compared against such distance obtained by conventional visibility performance evaluation.RESULTS: The evaluation method based on illuminance of headlight is not appropriate when viewed from the visibility concept that is based on object-perceivable distance. Further, the results indicated a shorter object-perceiving distance even when road surface luminance is higher, thereby suggesting that illuminance of headlight and luminance of road surface are not the representative indices of nighttime visibility.CONCLUSIONS : Considering that this study utilized limited vehicle types and that road surface (background) luminance can vary depending on the characteristics of the given road surface, it would likely go too far to argue that this study’s visibility performance evaluation results can get generalized to other conditions. Regardless, there is little doubt that the current performance evaluation criterion which is based on illuminance, is unreasonable. There should be future endeavors on the current subject which will need to explore study conditions further, under which more experiments should be conducted and effective methodologies developed for evaluating automotive headlight visibility performance. Needs are recognized particularly in the development of headlight visibility performance evaluation methodology which will take into account road surface (background) luminance and luminance contrast from various perspectives as the former indicates the driver’s perception of the front road alignment and the latter being indicative of object perception performance.

Purpose: This study aimed to compare students’ and examiner’s assessment scores of students’ simulated performance. Methods: For two years, 46 teams of 183 senior nursing students participated in simulated emergency. The examiner assessed the students’ reactions during simulation using the Nursing Competency Scale in Simulation (NCSS). The students assessed their own performance using the same scale after participating in the simulation. Data were analyzed using descriptive statistics, a paired t-test, a one-way ANOVA, a Kruskal-Wallis test, an independent t-test, and a Mann-Whitney U test. Results: The students’ NCSS scores were significantly higher than those of the examiner. The difference of students’ self-rated and examiner’ scores was larger in the lower third group of actual NCSS scores as compared to the difference for those in the upper third group. The students’ self-assessment accuracy improved after exposure to the NCSS, but the change was not significant. Conclusion: The findings can be suggest various strategies to promote more realistic self-appraisals among students.

This study investigates the seismic performance of solid reinforced concrete columns with triangular reinforcement details using nonlinear seismic analysis. The developed reinforcement details are economically feasible and rational, and facilitate shorter construction periods. By using a sophisticated nonlinear finite element analysis program, the accuracy and objectivity of the assessment process can be enhanced. Solution of the equations of motion is obtained by numerical integration using Hilber-Hughes-Taylor (HHT) algorithm. The proposed numerical method gives a realistic prediction of seismic performance throughout the input ground motions for several column specimens. As a result, developed triangular reinforcement details were designed to be superior to the existing reinforcement details in terms of required performance.

본 논문에서는 약용매에서 용해될 수 있는 지방산 변성 에폭시수지를 합성하였고, 합성한 수지 의 용해도 평가가 이루어졌다. 지방산 변성 에폭시수지를 합성하기 위하여 비스페놀A형, 페놀 노볼락형 및 오르소 크레졸 노볼락형의 3종류 에폭시수지를 사용하였고, 여기에 지방산, dodecyl phenol (DP), toluene diisocyanate (TDI)를 도입하였다. 합성조건은 당량기준으로 에폭시수지/지방산 = 1/0.5, 지방산/DP = 0.25/0.25, TDI 0.5이었고, 에폭시수지 종류에 따라 12종류의 지방산 변성 에폭시수지가 합성되었다. 합성 된 지방산 변성 에폭시수지에 대하여 점도 및 용매√가용성을 평가한 결과, 벤젠고리와 글리시딜기의 함량 및 알킬기의 탄소수가 증가할수록 약용매에 대한 용해성이 우수한 것으로 나타났다. 또한 약용매에 용해성 이 우수한 지방산 변성 에폭시수지를 사용하여 투명 도료를 제조하여 물성을 평가한 결과, 비스페놀A형 에 폭시수지/지방산/DP/TDI의 당량비가 1.0/0.25/0.25/0.5인 것과 페놀 노볼락형 에폭시수지/지방산/DP의 당량비가 1.0/0.25/0.25인 조성에서 건조시간, 접착력, 도막경도, 내충격성, 내알칼리성에서 양호한 물성을 나타내었다.

In this paper, seismic performance assessment has been examined for a mid-rise RC building subjected to 2016 Gyeongju earthquake occurred in Korea. For the purpose of the paper, 2D external and internal frames in each direction of the building have been employed in the present comparative analyses. Nonlinear static pushover analyses have been conducted to estimate frame capacities. Nonlinear dynamic time-history analyses have also been carried out to examine demands for the frames subjected to ground motions recorded at stations in near of Gyeongju and a previous earthquake ground motion. Analytical predictions demonstrate that maximum demands are significantly affected by characteristics of both spectral acceleration response and spectrum intensity over a wide range of periods. Further damage potential of the frames has been evaluated in terms of fragility analyses using the same ground motions. Fragility results reveal that the ground motion characteristics of the Gyeongju earthquake have little influence on the seismic demand and fragility of frames.

The study analyzed performance assessment factors of VOCs odor sensors from 3 different manufacturers, such as minimum detection limit, humidity stability and temperature stability. Through the minimum detection limit assessment, it was found that a VOCs sensor was able to detect TVOCs at the concentration of 5 ppb. The standard deviation ratio was over 10%, and it increased as humidity rose. The range of temperatures in which the VOCs odor sensor using photoionization could operate was between 25oC and 40oC, and the sensor output values were unstable at low temperatures. In terms of the temperature stability of the metal oxide semiconductor sensor for measuring complex odors, the sensor output values dropped considerably to 0~10oC, and were similar to the concentrations of odorous gases generated at 25oC. The results of the test of VOCs odor sensor outputs after temperature and humidity pre-treatment revealed that the respective stable output values at 50% humidity and 25oC were similar to the concentrations of manufactured odors. In terms of temperature and humidity stability of the VOCs odor sensors, all target VOCs substances had stable output values at 25oC to 40oC and at 50% to 65% relative humidities, and unstable values at low temperatures and high humidities. Therefore, the implementation of pre-treatment systems including temperature and humidity correction (25~40oC, 50~65% RH) is required for the stable use of VOCs odor sensors.

국제지질자원인재개발센터는 지질자원 분야의 국내·외 인적자원개발을 목적으로 설립되었으며, 개원 이래 교육 훈련 목표 성과를 달성하며 운영되고 있다. 이 연구에서는 국제지질자원인재개발센터 성과의 객관성을 확인하기 위하여 교육인증과정 수료자를 대상으로 교육요구분석 및 교육훈련 과정 성과평가를 실시하였다. 교육요구분석을 위해 Borich 교육요구도와 Locus for Focus 방식을 활용하였다. 교육훈련 과정 성과평가는 성별, 연령별, 학력별, 수강구분에 따라 만족도 및 현업적용도 분석을 위해 설문조사 방식을 활용하였다. 연구결과, 지질학, 광물자원, 석유해저, 지구환경 분야 의 교육훈련 과정의 교육요구도가 도출되었으며, Locus for Focus 방식에 따라 교육과정 개발의 시급성을 판단하였다. 교육훈련 과정 성과평가 결과 광물자원, 지구환경 분야의 과정이 지질학 분야의 과정보다 학습성취에 대한 만족도가 높은 것으로 나타났다.

이 논문에서는 벽체의 형상(평면벽체, 곡면벽체) 및 벽체에 도입된 긴장력이 충돌저항성능에 미치는 영향을 수치해석적 기법을 사용하여 평가하고자 하였다. 벽체의 곡률 및 긴장력 도입률을 변수로 총 12 케이스의 충돌해석을 수행하였으며, 충돌체로는 상용 민항기엔진의 3차원 상세모델을 사용하였다. 충돌저항성능을 평가하기 위해 관입깊이와 벽체 중앙부 후면의 최대 변위를 비교하였다. 긴장력의 도입에 의해 관입깊이는 약 60∼80% 수준으로 감소하는 것으로 나타났으나, 후면 변위는 큰 차이가 나타나지 않았으며, 벽체 형상에 따른 차이는 상대적으로 크지 않은 것으로 나타났다.

Grate bar is a metal part being used in the sintering process in a steel company. It is exposed to severe operating conditions such as high temperature, corrosion, wear and chemical reaction and etc. In this paper, the surface of the grate bar is coated with high performance materials. They are Al2O3, Cr2O3, WC. These materials have enhanced grate bar’s performances of life time, corrosion, thermal resistance, abrasion, chemical resistance and etc. These high quality characteristics are verified through experimental tests. The results are presented and discussed.

In this paper, the full-size structural performance test for a lightweight soundproof tunnel composed of partitioned pipe truss members is carried out to investigate the structural performance. In addition, a nonlinear structural analysis of the same finite element model as the full-size testing model is performed to compare the test result. The test and analysis results showed that the lightweight soundproof tunnel ensures the structural safety against wind loads, snow loads and load combinations. As a result, the full-size test and analysis results m

This study investigates the performance of hollow precast segmental bridge columns with reinforcement details for material quantity reduction. The proposed triangular reinforcement details are economically feasible and rational, and facilitate shorter construction periods. The precast segmental bridge columns provides an alternative to current cast-in-place systems. We tested a model of hollow precast segmental bridge columns under a constant axial load and a quasi-static, cyclically reversed horizontal load. We used a computer program, Reinforced Concrete Analysis in Higher Evaluation System Technology (RCAHEST), for analysis of reinforced concrete structures. The used numerical method gives a realistic prediction of performance throughout the loading cycles for hollow precast segmental bridge column specimens investigated. As a result, proposed reinforcement details for material quantity reduction was equal to existing reinforcement details in terms of required performance.

The purpose of this study was to find which spatiotemporal gait parameters gained from stroke patients could be predictive factors for the gait part of Tinetti Performance-Oriented Mobility Assessment (POMA-G). Two hundred forty-six stroke patients were recruited for this study. They participated in two assessments, the POMA-G and computerized spatiotemporal gait analysis. To analyze the relationship between the POMA-G and spatiotemporal parameters, we used Pearson’s correlation coefficients. In addition, multiple linear regression analyses (stepwise method) were used to predict the spatiotemporal gait parameters that correlated most with the POMA-G. The results show that the gait velocity (r=.67, p<.01), cadence (r=.66, p<.01), step length of the affected side (r=.49, p<.01), step length of the non-affected side (r=.53, p<.01), swing percentage of the non-affected side (r=.47, p<.01), and single support percentage of the affected side (r=.53, p<.01) as well as the double support percentage of the non-affected side (r=-.42, p<.01) and the step-length asymmetry (r=-.64, p<.01) correlated with POMA-G. The gait velocity, step-length asymmetry, cadence, and single support percentage of the affected side explained 67%, 2%, 2%, and 1% of the variance in the POMA-G, respectively. In conclusion, gait velocity would be the most predictive factor for the POMA-G.

In this study, we investigated and analyzed the registration, sales and regulatory management system of in vitro diagnostic veterinary medical reagents (IVDVMRs) in Korea. The registration of IVDVMRs has gradually increased since 2000, and total of 233 products from 58 companies were registered from 1975 to 2014. The market size of IVDVMRs is estimated to be approximately 12 billion Won per year from 2011 to 2013: the export sales and proportion was estimated to be 36.8% as 4.4 billion Won in 2013. Of these products, the ranking of the sales were canine heartworm, bovine tuberculosis, swine fever, porcine reproductive and respiratory syndrome, canine distemper+adenovirus+parvovirus disease, foot and mouth disease, etc. In vitro diagnostic human medical reagents were diverted biological medicine from the medical devices by the revision of the Pharmaceutical Affairs Law Enforcement Regulations in 2014 in Korea. In contrast, in vitro diagnostic devices for animal were still managed as medical devices and biological medicines, respectively. The diagnostic reagents for infectious diseases have neither classification nor grade systems. Good manufacturing practices (GMP) requirements on IVDVMRs were also exempted from the current system. This study suggested that the registration of the IVDVMRs has increased since 2005, and regulations of these devices should be improved for the effective operating system.

본 논문의 목적은 영화영상을 전공하고 현재 영상 특성화고에 재직하고 있는 교사들에 의해 시행되고 있는 수행평가에 대해 고찰하는 것이다. 특히 공교육 차원에서 영상 콘텐츠의 실효성 있는 교육을 위해 수행평가의 도입은 필수적이라고 할 수 있다. 수행평가와 유사한 주제의 연구들은 교육과정이나 교육만족도 혹은 시설조건 등에 관한 연구를 중심으로 이루어졌다. 그러나 영상미디어 교육과정 자체에 대한 연구가 부족하여 이를 수행평가를 중심으로 고찰하고자 하였다. 교육에서 평가는 핵심적인 요소이다. 특히 미디어 콘텐츠 교육의 경우처럼 제작과 같은 수행적 의미가 강한 교육에서 더욱 그러하다. 본 연구는 학교 내의 실상과 교사들의 심정을 파악하기 위한 연구방법으로 심층면접을 시도하였다. 연구의 결과로 수행평가의 특성과 활용은 단순하게 파악될 수 없고, 그것은 지역성, 학생들의 학업성취도, 장비의 구비현황이나 특히 교사의 교육관에 따라 다르게 이해되어야 한다는 점을 알 수 있었다. 그리고 이에 따라 다양하고 지속적인 평가가 이루어져야 함을 파악할 수 있었다

본 연구에서는 현재 전량 폐기되는 정수기용 폐 필터를 재활용하고자 폐 필터의 오염도 및 성능을 평가하였다. 성능 평가를 위해 실제 정수기에서 사용 후 폐기되는 RO 멤브레인 필터(도레이 케미칼에서 제조)를 회수하여 flux 및 rejection 을 측정하였고, 대조군으로써 새 필터도 같은 조건으로 실험을 진행하였다. 또한 주사전자현미경(SEM), 감쇠전반사-푸리에변환 적외선 분광기(ATR-FTIR), X선 광전자 분광기(XPS)를 이용하여 폐 필터의 표면 오염도를 분석하였다. 이를 통해 폐 필터 표면에 막 오염(fouling)의 요인과 정도를 확인하였고 이러한 분석 결과를 바탕으로, 폐 분리막 모듈의 재활용 및 복원 기술 연구를 통한 순환 활용 기술을 확보하고자 한다.

The use of complimentary indicators, other than radiation dose and risk, to assess the safety of radioactive waste disposal has been discussed in a number of publications for providing the reasonable assurance of disposal safety and convincing the public audience. In this study, the radionuclide flux was selected as performance indicator to appraise the performance of engineered barriers and natural barrier in the Wolsong low- and intermediate-level waste disposal facility. Radionuclide flux showing the retention capability by each compartment of the disposal system is independent of assumptions in biosphere model and exposure pathways. The scenario considered as the normal scenario of disposal facility has been divided into intact or degraded silo concrete conditions. In the intact silo concrete, the radionuclide flux has been assessed with respect to the radionuclide retardation performance of each engineered barrier. In the degraded silo concrete, the radionuclide flux has been explored based on the performance degradation of engineered barriers and the relative significance of natural barrier quantitatively. The results can be used to optimally design the near-surface disposal facility being planned as the second project phase. In the future, additional complimentary indicators will be employed for strengthening the safety case for improving the public acceptance of low- and intermediate-level waste disposal facility.