49세의 초로에 접어든 예이츠는 시인으로서의 ‘책임’을 통감하고 1914년 여섯 번째 시집 『책임』을 발행한다. 그는 아일랜드 상원의원으로서 사회적 책임, 일생 동안 사랑했던 모드 곤을 비롯한 주변 인물들에 대한 개인적인 책임, 아름다운 시를 쓰고자 한 시인으로서의 심미학적 책임을 이 시집에서 시를 통하여 표현하고 있다. 이 시집을 중심으로 전과 후의 시세계가 완전히 달라져서 예이츠 학자들은 이 시집을 매우 중요한 전환점으로 평가한다.

Machines and facilities are physically or chemically degenerated by continuous usage. The representative type of the degeneration is the wearing of tools, which results in the process mean shift. According to the increasing wear level, non-conforming products cost and quality loss cost are increasing simultaneously. Therefore, a preventive maintenance is necessary at some point . The problem of determining the maintenance period (or wear limit) which minimizes the total cost is called the ‘process mean shift problem’. The total cost includes three items: maintenance cost (or adjustment cost), non-conforming cost due to the non-conforming products, and quality loss cost due to the difference between the process target value and the product characteristic value among the conforming products. In this study, we set the production volume as a decreasing function rather than a constant. Also we treat the process variance as a function to the increasing wear rather than a constant. To the quality loss function, we adopted the Cpm+, which is the left and right asymmetric process capability index based on the process target value. These can more reflect the production site. In this study, we presented a more extensive maintenance model compared to previous studies, by integrating the items mentioned above. The objective equation of this model is the total cost per unit wear. The determining variables are the wear limit and the initial process setting position that minimize the objective equation.

PURPOSES : The purpose of this study is to build an optimization model using the capacity and initial travel speed of the volume delay functions for network calibration performed in the traffic demand analysis process. METHODS : The optimization model contains an error term between the observed traffic volume and estimated traffic volume, based on the user equilibrium principle, and was constructed as a bi-level model by applying range constraints on capacity and travel time. In addition, we searched the split section to apply the method of adjusting the section instead of adjusting the single link. The optimization model is constructed by applying the warm-start method using the bush of the origin-based model so that parameter adjustment and traffic assignment are repeatedly executed within the model and the convergence of the model configured %RSSE. RESULTS : As a result of analysis using the toy network, the optimization model is that the observed traffic volume is estimated when there are no restrictions and, when the constraint conditions were set, the error with the observed traffic volume and error rate was significantly reduced. As a result of the comparative analysis of the trial-and-error methods, KTDB optimum values, and optimization models in empirical analysis using a large-scale network, the evaluation indexes (e.g., RMSE and %RMSE) were significantly improved by applying the optimization model. CONCLUSIONS : Based on the empirical analysis, the optimization model of this study can be applied to large-scale networks and it is expected that the efficiency and reliability of road network calibration will be improved by repeatedly performing parameter adjustment and traffic assignment within the model.

꽃송이버섯은 우리나라에서 2000년대 초반부터 재배를 시작하였고, 국내에서는 전라북도농업기술원이 육성한 ‘너울’이 2016년에 최초로 등록되어 있다. 그러나, 꽃송이버섯에 대한 재배매뉴얼이 없어 여전히 농가마다 자실체 생산성의 차이가 큰 실정이다. 이에 꽃송이버섯 ‘너울’의 발이조건을 구명하고 안정생산 기술을 개발하고자 배지 pH, 배지함수율, 종균접종량 조건에 따른 연구를 수행한 결과, 재배일수, 수확률과 자실체 중량을 고려한 연중 병당 수 량은 pH 3.8 처리구가 363.6 g으로 가장 높게 나타났으나 pH 3.6 조건에서는 수량이 189.5 g으로 급감하는 점, pH 4.0 조건이 배양일수가 짧고 pH 3.8 조건과 비교하여 재배일수가 같으며, 자실체 중량 차이의 유의성이 인정되지 않는 점, 농가에서 활용 시 정밀한 pH 조절이 어려운 점을 고려하여 pH 3.9±1로 조절하여 재배해야 안정생산이 가능할 것으로 판단된다. 아울러 배지함수율을 65%로 조절하고, 배지부피의 4%에 해당하는 액체종균을 접종 후 배양실 내 습도조건을 50% 이하로 설정하면 연중 병당 341.8 g을 생산할 것으로 판단된다.

PURPOSES : This study verifies the appropriateness of the observed traffic volume using car navigation traffic volume data. METHODS : In this study, we developed an annual average daily traffic (AADT) estimation model that can verify the total amount of traffic by using navigation traffic volume data. In addition, a method to verify the appropriateness of the observed traffic volume was developed using time-based navigation traffic volume data that can check the characteristics of traffic volume at each point. RESULTS : As a result of the analysis of this study, it was found that 674 of the 697 short-duration survey spots of the freeways were appropriate and that 23 spots needed to be revised. CONCLUSIONS : As a result of the analysis of this study, it was found that there was a strong positive correlation between the observed traffic volume and the car navigation traffic volume. Thus, the appropriateness of the observed traffic was determined by verifying the total amount of observed traffic and the observed traffic volume by time.

Economic indicators are a factor that affects air cargo volume. This study analyzes the different factors affecting air cargo volume by each Chinese cities according to the main characteristics. The purpose of this study is to help companies related to China, airlines, and other stakeholders predict and prepare for the fluctuations in air cargo volume and make optimal decisions. To this end, 20 economic data were used, and the entire data was reduced to 5 dimensions through factor analysis to build a dataset necessary and evaluated the influencing factors by multi regression. The result shows that Macro-Economic Indicators, Production/Service indicators are significant for every cities and Chinese manufacture/Customer indicators, Korean manufacture/Oil Price indicators, Trade/Current indicators are significant for each other city. All adjusted R2 values are high enough to explain our model and the result showed excellent performance in terms of analyzing the different factors which affects air cargo volume. If companies that are currently doing business with China can identify factors affecting China's cargo volume, they can be flexible in response to changes in plans such as plans to enter China, production plans and inventory management, and marketing strategies, which can be of great help in terms of corporate operations.

본 연구는 스마트건설 지원을 위한 드론 활용의 활성화를 위해 RTK 드론 기반의 항공측량 정밀도를 분석하고자 GPS만을 사용하는 방식, GCP를 설치하는 방식, RTK 드론을 이용한 방식의 정사영상의 위치정확도를 분석하였고 사업의 목적과 대상지의 형태에 따른 드론 활용의 기준을 제시하였다. 또한 상용 드론을 이용한 체적기반의 토공량 산출을 2.5D 환경에서 산출하여 기존 방법과 비교해서 드론영상을 효율적으로 활용할 수 있는 방법을 제시하였다. 본 연구로 대규모 건설현장의 작업효율 및 드론 활성화가 기대된다.

본 연구에서는 폴리머 시멘트 모르타르의 인장성능을 개선하기 위하여 PVA 섬유를 적용하고자 하였다. PVA 섬유 혼입량에 따른 재료특성을 검토하여, 섬유보강 폴리머 시멘트 모르타르의 제조 가이드라인을 제공하고자 하였다. 폴리머 시멘트 모르타르의 제조를 위하여 친수성의 합성수지(SR)를 사용하였다. 실험에 사용된 변수로 (W+SR)/C비를 고정하여, 사용물에 대한 합성수지의 치환율을 일정하게 증가시켜 사용하였다. PVA 섬유의 혼입량은 각각의 실험체에 0%,1%,2%를 혼입하여 실험을 수행하였다. 재료특성 실험으로는 압축강도시험, 쪼갬 인장강도시험, 휨 강도 시험을 수행하였다. 폴리머 시멘트 모르타르에 PVA 섬유를 혼입하면 쪼갬 인장강도 및 휨 강도가 증가하는 것을 확인 하였다. 따라서, 본 연구결과는 합성수지 혼입 폴리머 시멘트 모르타르의 인장성능 개선을 위한 PVA섬유 혼입시 제조 가이드라인으로 활용이 가능할 것으로 판단된다.

In fisheries, the importance of designing efficient fish cages is being emphasized as aquaculture has become more production than capture fishing. Particularly, the gravity cage system is one of the popular fish cage system in Korea. Currently, gravity cages of various shapes and sizes are being widely designed and installed in offshore and inland seas. The cage is subject to external forces, such as currents and waves, and the shape of the structure and tension on the ropes changes according to these external forces. Thus, it is important to accurately calculate these dynamic behavior, including the external forces and tension on the structure during the design stage. In this study, three types of cage systems with an equal internal volume of 8000 m3 were analyzed using mass-spring models and their behavior was interpreted through simulations. These simulations were used to analyze the behavior and tension of the ropes in response to currents and waves to aid in the selection of individual cage sizes for a given total volume. The numerical calculation results indicate that depending on the flow rate, the most resistant system is System 1, which has eight strays, and System 2 and System 3 have 69.4% and 54.8% of the resistance of System 1. Further, total resistance increased as the number of cages increased for all flow rates.