이 연구는 과학 영재 학생들의 지구계에 대한 지식, 중요성, 과학 동기 사이에 상관 관계를 분석하고 시사점을 얻는데 그 목적을 두고 있으며, 기존에 수행되지 않았던 내용을 다루는 탐색적 연구이다. 연구는 K 대학 부설 과학영 재교육원 소속 중등 융합과학반 학생 93명을 대상으로 지구계에 대한 지식과 중요성, 과학 동기를 분석할 수 있는 설 문지를 투입하고 지구계에 대한 지식과 중요성이 과학 동기에 미치는 영향을 상관분석과 회귀분석을 통해 결과를 도출 하였다. 그 결과, 지구계에 대한 지식은 과학 동기에 상관계수 .656으로 높은 상관을 보여주었다. 반면 지구계에 대한 중요성은 과학 동기와 .387로 다소 낮은 상관이 나왔다. 높은 상관을 보여준 지구계에 대한 지식과 과학 동기의 회귀분석을 통해 그 설명력을 분석한 결과, 과학 동기의 총 변화량의 43%를 지구계에 대한 지식이 설명함을 나타내었다. 분 석 결과를 토대로 지구계에 대한 체계적인 교육 프로그램을 개발하여 과학 영재 학생들의 수업에 적극적으로 활용한다 면 과학 동기의 유발과 함께 학습 동기와 관련된 다양한 시사점을 얻을 수 있을 것이다.

Uranium-contaminated soil can be cleaned using an acid washing process. However, high-concentration acid washing generates substantial amounts of radioactive waste, making it essential to develop a treatment process using low-concentration acid. This study evaluated the effectiveness of low-concentration sulfuric acid washing for uranium removal from contaminated soil. Experiments were conducted with a 0.05 M sulfuric acid solution. With a mixing ratio of soil to acid solution at 1:5, three consecutive washes were sufficient to remove uranium from contaminated soil to clearance level. During the acid washing process, real-time pH monitoring was performed to analyze the correlation between uranium leaching and pH changes. This led to the establishment of a monitoring-based process control strategy. In conclusion, we identified an effective method for removing uranium from soil under low acid concentration conditions. Consequently, significant reductions in radioactive waste generation are anticipated.

Acid-washed solutions containing various ions, including uranium, are produced by washing uranium-bearing soil or minerals with H2SO4. Conventional extraction processes are complex, as they involve multiple steps and generate significant amounts of radioactive organic waste, posing environmental risks. Therefore, it is necessary to develop a simplified process that can selectively extract uranium while minimizing radioactive waste production. In this study, thermodynamic equilibrium calculations were performed to investigate the selective extraction of uranium through its reaction with H2O2. A basic additive was introduced to facilitate this reaction. The calculation results indicated that uranium in acid-leached solutions could be selectively extracted through a single-step precipitation process, which was experimentally validated. These findings can be utilized to design an efficient process for obtaining high-purity uranium from uranium-bearing soil or minerals.

Ships' collision accident has often occurred in congested waterways or in harbour areas. To examine the cause of collision accident may be necessary to prevention against another similar one. We discuss the construction of ship-manoeuvring-simulator system used for reproducing ships' collision phenomenon The system consists of one simulator bridge for own ship and two control consoles for own ship and target ship. Own ship and target ship are linked each other, and are simultaneously manoeuvred in simulator bridge or at control console respectively. And a simulator experiment for reproducing ships' collision phenomenon and for examining the cause of accident is carried out. Through the present case study, we find out that the constructed simulator system is very useful for reproducing ships' collision phenomenon and for examining the cause of accident.

Yaw-checking and course-keeping ability in IMO's ship manoeuvrability standards are reviewed from the viewpoint of safe navigation. Three kinds of virtual series-ships, which have different course instability, are taken as test models. The numerical simulation on Z-test is carried out in order to examine the correlation between known manoeuvrability in spiral characteristics and various kinds of overshoot angle. Then simulator experiments are executed with series-ships in a curved, narrow waterway by six operators(five active pilots and one ex-captain) in order to examine the correlation between known manoeuvrability and degree of manoeuvring difficulty. IMC criteria for yaw-checking and course-keeping ability are discussed and revised criteria are proposed.