The small coastal vessel registered in Korea, small coastal vessels with a gross tonnage of 10 tons or less account for 94.6 % and among them, aged vessels over 16 years age indicate 40.6 %. In order to reduce GHG emissions from small coast vessels, discussions are underway to replace aging ships' propulsion units with eco - friendly propulsion facilities, and the electric propulsion ship is emerging as one of the measures. The electric propulsion system using the DFE rectifier, which was applied in the conventional large commercial vessel, was effective in reducing the harmonics and improving the DC output voltage of the DC link stage, but it occupied a large volume and caused an increase in the overall system price. Therefore, in this paper, we propose an electric propulsion system using AFE rectifier with a small volume of system that can be applied to a small coastal vessel. In order to analyze the effectiveness of the overall system, the load profile was applied to obtain accurate and rapid speed tracking performance of the propulsion motor affected by the speed load. In addition, the power factor and total harmonic distortion factor of the voltage and current on the improved power output side are derived through simulation.

To perform the Maritime Safety Audi Scheme, 10-4 was constantly applied without adjustment when evaluating the proximity of the fairway. The necessity of applying the different aberrancy probabilities from the different proximity of the fairway depending on the shape of the route and the size of the ship was validated using marine simulations. Marine simulation was performed to evaluate the validity of statistical analysis-based aberrancy probability according to the different shapes of routes and ship size presented in the previous study. As results, the validity of the criterion of the statistical analysis-based aberrancy probability was confirmed by comparing with the results of simulation-based aberrancy probabilities. The results support that the aberrancy probabilities by the types of a vessel could be different based on the type and size of vessels. The results motivate that further investigation is required to find the reasonable criteria of the aberrancy probabilities for the maritime traffic safety audit according to the fairway shape and the size of the vessel.

Despite the accident rate for fishing vessels accounts for 70% of all maritime accidents, few studies on such accidents have been done and most of the them mainly focus on causes and mitigation policies to reduce that accident rate. Thus, this risk analysis on sea accidents is the first to be performed for the successful and efficient implementation of accident reducing measures. In risk analysis, risk is calculated based on the combination of frequency and the consequence of an accident, and is usually expressed as a single number. However, there exists uncertainty in the risk calculation process if one uses a limited number of data for analysis. Therefore, in the study we propose a probabilistic simulation method to forecast risk not as a single number, but in a range of possible risk values. For the capability of the proposed method, using the criteria with the ALARP region, we show the possible risk values spanning across the different risk regions, whereas the single risk value calculated from the existing method lies in one of the risk regions. Therefore, a decision maker could employ appropriate risk mitigation options to handle the risks lying in different regions. For this study, we used fishing vessel accident data from 1988 to 2016.

This study compares optimization algorithms for efficient estimations of ship's hydrodynamic coefficients. Two constrained algorithms, the interior point and the sequential quadratic programming, are compared for the estimation. Mathematical optimization is designed to get optimal hydrodynamic coefficients for modelling a ship, and benchmark data are collected from sea trials of a training ship. A calibration for environmental influence and a sensitivity analysis for efficiency are carried out prior to implementing the optimization. The optimization is composed of three steps considering correlation between coefficients and manoeuvre characteristics. Manoeuvre characteristics of simulation results for both sets of optimized coefficients are close to each other, and they are also fit to the benchmark data. However, this similarity interferes with the comparison, and it is supposed that optimization conditions, such as designed variables and constraints, are not sufficient to compare them strictly. An enhanced optimization with additional sea trial measurement data should be carried out in future studies.

부흥과 교회성장은 분명 다른 개념이지만, 많은 한국 기독교인들은 부흥과 교회성장을 동의어로 사용하고 있다. 예를 들어, ‘교회가 부흥했는가?’라고 질문을 할 때, 사람들이 알고 싶어 하는 내용은 대부분 교회의 숫자적 성장 여부이다. 이러한 경향은 1903년부터 1907년까지 지속된 초기 한국 대부흥의 시기에 있었던 교회성장 경험으로부터 시작되었다고 볼 수 있다. 이 논문은 부흥과 교회성장 간의 차이와 관계를 부흥의 의미, 목적, 결과를 중심으로 연구하고 있다. 만일 진정한 부흥이 일어난다면, 그 부흥의 결과는 교회성장으로 이어진다. 하지만 부흥 없이도 교회성장이 있을 수 있다는 점에서 교회성장과 부흥은 다르다. 그러므로 부흥과 교회성장이 매우 밀접한 관계에 있음에도 불구하고 이 둘은 서로 다르다고 볼 수 있다.

Space law is normally referred to international space law. As national space activities develop, however, national space laws have been legislated in many countries for the development of space resources. These are used to present conflicting cases between national and international space law (corpus juris spatialis internationalis) on the interpretation of space resource exploitation. This study is devoted to bridging the gap between these two legal systems. In this paper, the author will critically review the fundamental principles of space resource exploitation under international law and suggest a direction for setting up national space laws for future space resources. This paper is composed of seven parts, including a short Introduction and Conclusion. Part two will discuss acts pertaining to asteroid resources. Part three will deal with res extra commercium. Part four will analyze the non-appropriation principle. Part five will look into the common heritage of mankind. Part six will investigate res nullius humanitatus.

본 연구는 일본과 한국에서 기독교의 수용과 발전에 대조적 유형이 존재하는 것에 주목하여 이 두 이웃 나라에서 개신교와 일반 대중의 종교성을 비교함으로써 동아시아의 ‘종교성’ 논의에 기여하고자 한다. 한국의 경우 근대화의 정신과 개신교 양자가 결합한 것이 중상층(‘엘리트 종교성’)에게 매력을 준 반면에, 고대로부터 내려오는 한국적 종교성(무속신앙)과 오순절 성령운동 기독교의 결합은 중하층(‘대중 종교성’)에게 한층 매력적인 것이었다. 보수적 개신교(장로교 혹은 순복음교단)와 무속신앙(민속 종교의 실천) 양자의 관계가 자연스러운 한국에서 신약성서의 축사(귀신쫓기)와 치병의 행위를 강조하는 기독교의 성령운동적 형태가 괄목할 만한 성장을 이루었다. 이와 대조적으로 일본의 경우 민속 종교와 무속신앙을 믿는 일반 대중은 천리교, 금광교, 창가학회 같은 이른바 ‘신종교’에 이끌렸다. 특히 1960년 이래 이 신종교들은 치병은 물론 가난에 대한 해결 방안을 제공하였다. 일본의 상황에서 기독교는 사무라이(무사) 계급을 주로 개종시켰는데, 이들은 여전히 유교적 에토스(‘엘리트 종교성’)를 놓지 않았다. 이로부터 기독교는 주로 일본 사회의 교육받은 ‘상류’ 계층의 사람들로부터만 계속적인 지지를 받고 있다.

The worldwide PMA pavement is steadily increasing. Unlike straight asphalt at the specified temperature of the performance grade, PMA has little increase in complex modulus after RFTO. Even after satisfying the complex modulus of the original binder, the complex modulus after the RTFO does not satisfy the grade, so that the SBS may be over-prescribed. Unlike straight asphalt, PMA investigated the reason that the complex modulus did not increase after RTFO in this study. SBS consists of a styrene domain and a butadiene matrix. The morphology of SBS in PMA is not clear. The PMA was heat - treated to induce the formation of styrene domain and PG evaluation was carried out. As a result, we confirmed that the formation of styrene domain with aging effect changed the complex modulus after RTFO.

This study was conducted to develop a heat interception permeability aggregate pavement material that resists increase of air temperature and has permeability by decreasing pavement temperature of city in summer. For this study, a heat interception polymer binder mixed with heat interception material and polyurethane binder. And the study made heat interception permeability aggregate pavement material by mixing heat interception polymer binder. Using the materials, the study conducted flexural strength test and temperature reduction effect experiment. As the result, flexural strength was 5.43MPa average and the temperature reduction effect was effective up to maximum 16 degrees Celsius compared to current asphalt concrete.

The highway junctions are the areas where frequent congestion occurs due to a conflict between vehicles entering the main road from the connecting road and vehicles passing through the main road, which is the main target of microscopic and macroscopic traffic flow study. The importance of study on the behavior and the interaction between vehicles at the highway junctions has been emphasized as an essential element of the Cooperation Intelligent Transport System (C-ITS) and Autonomous Vehicle technology. In this study, merging location and time of vehicles in acceleration lane of highway merging area is recorded by aerial videos from drones, and vectormodelling method was developed with merging location (y-axis) and merging time (x-axis). In the vector model, the vector region of the traffic flow is represented by the realistic expressible vector region and the stable entry into the highway. The model is compared with the traffic conditions according to speed, traffic volume, and density in main line and connecting road. This study can be used as a basic data for understanding the behavior of vehicles at the highway junctions and It is expected to be used as an operational indicator for advanced transportation such as lamp metering, C-ITS, and Autonomous Vehicle technology to stable traffic flow on the highway.

Cold recycled asphalt has been utilized to overcome high energy consumption and working temperature and low recycled pavement material percentage in hot mix asphalt and concrete pavement [1]. Up to dates, asphalt recycling on site called as Cold In-Place Recycling (CIR), Cold Central Plant Recycling (CCPR) and even hot recycling technologies have been developed and applied to the fields, but limitations such as poor adhesion between gravel and asphalt, slow hydration time, bleeding pavement are reported, respectively [2, 3, 4]. Among these issues, hydration time and initial strength in application are all related to the property of mineral filler influencing the mechanical property of pavement mixture. Due to these reasons, there have been continuous needs to develop new mineral filler to overcome previously reported issues by with the respects of mineral composition, hydration reaction and surface reaction enhancement. In this study, several natural minerals such as alumina, silicate, and calcium oxide were utilized as raw materials and following characterizations using SEM, EDS, XRD, and BET were performed to evaluate materials properties and suggest research directions for the optimum mineral filler development.

In the United States and Europe, new environmentally friendly asphalt pavement has been researched as an alternative to traditional hot asphalt pavement. After the Paris Convention of 2015, policies should be found to reduce carbon dioxide. In the field of asphalt pavement, new methods are needed to reduce carbon dioxide from the traditional hot asphalt pavement. In Korea, waste asphalt is growing and natural aggregate is running dry. So the government is implementing policies to increase the use of waste resources. So, it created a new asphalt pavement method to reduce CO2 and use waste asphalt. It is a cold recycled asphalt pavement. Emulsified asphalt has a balance of dispersibility, stability, and adhesive between water, aggregates, and asphalt. But, the physical properties of emulsified asphalt can be degraded compared to traditional hot asphalt pavement. So there are limitations in actual use. The study compared the softening point, elastic recovery, and penetration properties of asphalt mix compounds by using latex in emulsified asphalt. In particular, cations latex was used for the emulsified asphalt, which could further improve the physical properties.