According to the ‘Regulations on the Delivery of Low and Medium Level Radioactive Waste’, Notification No. 2021-26 of the Nuclear Safety and Security Commission, a history of radioactive waste and a total amount of radioactivity in a drum are mandatory. At this time, the inventory of radionuclides that make up more than 95% of the total radioactivity contained in the waste drum should be identified, including the radioactivity of H-3, C-14, Fe-55, Co-58, Co-60, Ni-59, Ni-63, Sr- 90, Nb-94, Tc-99, I-129, Cs-137, Ce-144, and total alpha. Among nuclides to be identified, gamma-emitting nuclides are usually analyzed with a gamma ray spectrometer such as HPGe. When a specific gamma-ray is measured with a detector, several types of peaks generated by recombination or scattering of electrons are simultaneously detected in addition to the corresponding gamma-ray in gamma-ray spectroscopy. Among them, the full energy peak efficiency (FEPE) with the total gamma energy is used for equipment calibration. However, this total energy peak efficiency may not be accurately measured due to the coincidence summing effect. There are two types of coincidence summing: Random and True. The random coincidence summing occurs when two or more gamma particles emitted from multiple nuclides are simultaneously absorbed within the dead time of the detector, and this effect becomes stronger as the counting rate increases. The true coincidence summing is caused by simultaneous absorption of gamma particles emitted by two or more consecutive energy levels transitioning from single nuclide within the dead time of the detector. This effect is independent of the counting rate but affected by the geometry and absolute efficiency of the detector. The FEPE decreases and the peak count of region where the energy of gamma particles is combined increases when the coincidence summing occurs. At the Radioactive Waste Chemical Analysis Center, KAERI, samples with a dead time of 5% or more are diluted and re-measured in order to reduce the random coincidence summing when evaluating the gamma nuclide inventory of radioactive waste. In addition, a certain distance is placed between the sample and the detector during measurement to reduce the true coincidence summing. In this study, we evaluate the coincidence summing effect in our apparatus for the measurement of radioactive waste samples.

Nuclear power plants, like other national critical infrastructures, could be under the threat of terrorism or other malicious action. Thus, a nuclear power plant has a robust security system that includes security guards, sensors, barriers, access control systems, lights, and alarm stations with security procedures. However, an effective security system is hard to design because a chain is only as strong as its weakest link, and there could be a vulnerable hole even in the robust security system. Thus, an effective security system requires the evaluation of all possible scenarios. Evaluation software for security system effectiveness assists in systematically assessing all the possible attack scenarios. Many countries developed security effectiveness evaluation software. The first software was developed by the U.S. Sandia National Laboratories in the 1980s. Now there are several commercially available software packages with a function to simulate limited-scope combat between security guards and attacking enemies. However, academic communication is comparatively weak because it may contain sensitive information on the vulnerability of nuclear power plants. We developed original software called Tools for Evaluating Security Systems (TESS) to identify the most vulnerable path to the designated target and model the security systems of all South Korean nuclear power plants. We also used commercial security effectiveness evaluation software, AVERT, to model the same nuclear power plants. TESS was developed to verify the results of commercial security effectiveness evaluation software for the purpose of regulatory use. For the feasibility test, we compared the results of two software with those of force-on-force (FoF) exercises in nuclear power plants. According to the relevant Act, every nuclear power plant site should perform the FoF exercises every year. KINAC was in charge of evaluating the FoF exercise and used several of its results for the study. In the results, even in some differences in detail, the two software and FoF exercises showed qualitative similarity. Conclusively, evaluation software is a useful tool to design and/or assess the security systems of nuclear power plants. We modeled the security systems of all South Korean nuclear power plants, and compared the developed software, a commercial software and FoF exercises. The results showed qualitative similarity. We provided the results of evaluation to nuclear operators for the better security of nuclear power plants.

Since 2017, the Korea Institute of Nuclear Nonproliferation and Control (KINAC) has been implementing State System of Accounting for and Control of Nuclear Materials (SSAC) training courses for the nuclear Newcomer States. This IAEA SSAC course for Newcomer States aims to provide overall concepts and techniques, particularly on nuclear material accountancy and control systems, and address future challenges with regard to developing new nuclear power plants. Due to the restricted travels and limited in-person access to training and facilities from the COVID-19 pandemic, however, a new software was developed to substitute a technical tour on bulk handling facility (BHF) of the training course, and the course was favorably shifted to online in 2021. This newly built training software allows participants to follow each step of the technical process at a virtual bulk handing facility, and provides a video tour for such conditions where the software is found difficult to operate. Another feature of the development is a security function that prevents access of unauthorized users to the software. The achievement is expected to strengthen the SSAC of Newcomer States and ensure the practical implementation of safeguards from the initial stage of their novel nuclear power program through cooperation with IAEA. This contribution of the Republic of Korea (ROK) as one of the leading countries in the field of nuclear nonproliferation will further extend the partnership between IAEA and ROK and promote cooperation with the Newcomer States.

4차 산업혁명 시대가 오면서 사회가 필요로 하는 인재는 단순히 지식을 많이 암기하는 사람이 아니라 새로운 문제를 찾아내고 다수와의 협업을 통해 이를 창의적이고 효율적으로 해결할 수 있는 사람으로 바뀌고 있다. 이에 더하여 지금은 데이터에 기반하여 의사결정이 이루어지고 이를 통해 사회가 개선되는 빅데이터(Big Data) 사회라 볼 수 있으므로 새로운 인재는 문제 해결과 관련 된 데이터를 수집하고 이해하여 필요한 정보를 분석하는 역량이 필요한 시대가 되었다. 새로운 2015 개정 교육과정에서는 4차 산업혁명 시대에 발맞추어 초‧중‧고(K-12) 학생들에게 소프트웨어에 기반한 문제해결 역량을 키워주기 위하여 소프트웨어 교육을 강화하였다. 하지만 지금의 소 프트웨어 교육은 코딩과 같은 프로그래밍을 중심으로 실시되며 문제를 해결하는 첫 번째 단계인 데이터 리터러시(data literacy)는 중요성이 덜하게 여겨져 왔다. 따라서 본 연구에서는 데이터 리터러시를 활용한 소프트웨어 교육이 중학생의 컴퓨팅 사고력과 창의적 문제해결력에 미치는 영향을 분석하였다. 본 연구를 위해 데이터 리터러시를 활용한 소프트웨어 수업을 CT-CPS 모형에 기 반하여 설계하고 적용하였다. 본 연구의 검증을 위해 중학교 1학년 학생을 대상으로 통제집단과 실험집단으로 나누고 통제집단에는 데이터 리터러시가 포함되지 않은 수업을 적용하고, 실험집단에는 데이터 리터러시가 포함된 수업을 적용하였다. 실험 결과 데이터 리터러시를 활용한 소프트 웨어 교육이 중학생의 컴퓨팅 사고력과 창의적 문제해결력 향상에 통계적으로 유의미한 효과가 있음을 검증하였다.

Technology-driven development of a new system makes it difficult for users and stakeholders to identify or intervene in the development process, resulting in systems with unnecessary functions and poor quality services. Applying the software architecture design process to the initial design of the navigation system platform of autonomous ships enables the development of a system that reflects the required functions and service quality of the stakeholders. The design, which includes all of the subsystems that make up an autonomous ship platform, is close to an enterprise architecture. Thus, we strived to design a navigation system platform suitable for the design range of the software architecture. This study analyzed the definition of functional requirements, and quality attributes by applying the software architecture design procedure. This study was conducted to identify the characteristics of the navigation system and platform needs, and the stakeholders were identified. To derive the functional requirements and constraints of the platform, a quality attributes workshop was held engaging stakeholders, and the results of the analysis of functional requirements and quality attributes were listed. Based on the results of this study, the architect can establish the evidence and technical solutions that are integral for the architecture development, and will facilitate the creation of quality attribute scenarios.

The purpose of this study is to design the curriculum of Basic College Software Programming to develop creative and logical-thinking. This course is guided by algorithmic thinking and logical thinking that can be solved by computing for problemsolving, and it helps to develop by software through basic programming education. Through the stage of problem analysis, abstraction, algorithm, data structure, and algorithm implementation, the curriculum is designed to help learners experience algorithm problem-solving in various areas to develop diffusion thinking. For Learners aim to achieve the balanced development of divergent and convergent-thinking needed in their creative problem-solving skills. Research design, data and methodology: This study is to design a basic software education for improving algorithm-thinking for non-major. The curriculum designed in this paper is necessary to non-majors students who have completed the 'Creative Thinking and Coding Course' Design Thinking based are targeted. For this, contents were extracted through advanced research analysis at home and abroad, and experts in computer education, computer engineering, SW education, and education were surveyed in the form of quasi-openness. Results: In this study, based on ADD Thinking's algorithm thinking, we divided the unit college majors into five groups so that students of each major could accomplish the goal of "the ability to internalize their own ideas into computing," and extracted and designed different content areas, content elements and sub-components from each group. Through three expert surveys, we established a strategy for characterization by demand analysis and major/textbook category and verified the appropriateness of the design direction to ensure that the subjects and contents of the curriculum are appropriate for each family in order to improve algorithm-thinking. Conclusions: This study helps develop software by enhancing the ability of students who practice various subjects and exercises to explore creative expressions in various areas, such as 'how to think like a computer' that can implement and execute their ideas in computing. And it helps increase the ability to think logical and algorithmic computing based on creative solutions, improving problem-solving ability based on computing thinking and fundamental understanding of computer coding and development of logical thinking ability through programming.

경주, 포항 지진이후 구조물의 내진성능평가에 대한 구조기술자의 관심이 증가하고 있으며, 내진성능평가를 위해 필요한 관련 소프트웨어에 대한 관심 역시 지속적으로 증가하고 있다. 국내의 경우 30년간 가장 널리 사용되어온 대표적인 소프트 웨어는 CSI(Computers&Structures)에서 개발된 SAP2000, PERFORM-3D 및 ETABS와 마이다스아이티에서 개발된 midas Gen이다. 위 소프트웨어들은 내진성능평가에 필수적으로 필요한 비선형정적, 동적해석 기능을 포함하고 있으며 제품에 따라 해석기능 이외에도 각종 기준이나 지침에 부합하는 다양한 응용기능들을 탑재하고 있다. 하지만 MIDAS GEN을 제외하고는 소프트웨어 해석기능의 제공범위나 장,단점에 대한 자료가 부족하여 기술자들이 해석목적에 따라 프로그램을 적절히 선택하고 사용하는데 어려움이 있다. 본 자료에서는 국내에서 내진성능평가 중 비선형동적 해석분야에서 많이 적용되고 있는 PERFORM-3D와 최근 기술자들이 관심을 가지고 있는 ETABS에 대한 기능상 장단점을 간단하게 소개하고자 한다.

In this study, the damping ratio was estimated using the developed automatic calculation software based on the field measurement data of vibration of stay cable in cable-stayed bridge. For the field measurement, two accelerometers were used for obtaining of dynamic behavior of 1st, 2nd and 3rd mode. The damping ratio after installation of the damper was calculated as higher than the requirement values, also it was confirmed that the damping effect was improved with the range of 19~92%.

The deep space orbit determination software (DSODS) is a part of a flight dynamic subsystem (FDS) for the Korean Pathfinder Lunar Orbiter (KPLO), a lunar exploration mission expected to launch after 2018. The DSODS consists of several sub modules, of which the orbit determination (OD) module employs a weighted least squares algorithm for estimating the parameters related to the motion and the tracking system of the spacecraft, and subroutines for performance improvement and detailed analysis of the orbit solution. In this research, DSODS is demonstrated and validated at lunar orbit at an altitude of 100 km using actual Lunar Prospector tracking data. A set of a priori states are generated, and the robustness of DSODS to the a priori error is confirmed by the NASA planetary data system (PDS) orbit solutions. Furthermore, the accuracy of the orbit solutions is determined by solution comparison and overlap analysis as about tens of meters. Through these analyses, the ability of the DSODS to provide proper orbit solutions for the KPLO are proved.

This paper presents an overview of deep space orbit determination software (DSODS), as well as validation and verification results on its event prediction capabilities. DSODS was developed in the MATLAB object-oriented programming environment to support the Korea Pathfinder Lunar Orbiter (KPLO) mission. DSODS has three major capabilities: celestial event prediction for spacecraft, orbit determination with deep space network (DSN) tracking data, and DSN tracking data simulation. To achieve its functionality requirements, DSODS consists of four modules: orbit propagation (OP), event prediction (EP), data simulation (DS), and orbit determination (OD) modules. This paper explains the highest-level data flows between modules in event prediction, orbit determination, and tracking data simulation processes. Furthermore, to address the event prediction capability of DSODS, this paper introduces OP and EP modules. The role of the OP module is to handle time and coordinate system conversions, to propagate spacecraft trajectories, and to handle the ephemerides of spacecraft and celestial bodies. Currently, the OP module utilizes the General Mission Analysis Tool (GMAT) as a third-party software component for highfidelity deep space propagation, as well as time and coordinate system conversions. The role of the EP module is to predict celestial events, including eclipses, and ground station visibilities, and this paper presents the functionality requirements of the EP module. The validation and verification results show that, for most cases, event prediction errors were less than 10 millisec when compared with flight proven mission analysis tools such as GMAT and Systems Tool Kit (STK). Thus, we conclude that DSODS is capable of predicting events for the KPLO in real mission applications.

항만의 서비스 수준은 항만의 운영 및 관리 주체인 터미널운영사(TOC), 항만공사 및 정부의 입장에서 항만간 경쟁력의 기준이 되 며, 항만의 이용 주체인 선사 및 화주의 입장에서는 어느 항만을 선택할 지를 결정하는 중요 지표로도 활용된다. 이러한 지표의 중요성을 고 려하여 컨테이너 부두 및 벌크부두를 대상으로 중요 서비스 지표인 선석 점유율, 선박 대기율, 선석 처리량, 접안 척수, 평균 대기 척수, 평균 대기 시간과 같은 6개 지표를 객관적으로 정의하고 관리할 수 있는 소프트웨어를 개발하였다. 컨테이너 부두는 1개 선석부터 6개 선석까지와 벌크 부두는 1개 선석부터 4개 선석까지를 선택적으로 활용할 수 있도록 6개의 서비스 지표를 산정하여 예측이 가능토록 하였다. 이를 활용 하면 선석점유율 대비 선박 대기율, 선석 처리량, 접안 척수, 평균 대기 척수, 평균 대기 시간을 예측할 수 있다. 추가하여 선박의 도착 패턴에 따라 선박 대기율과 항만의 생산성 지표인 연간 처리량도 어떻게 변화되는지를 예측할 수 있도록 하였다. 결과적으로, TOC 입장에서는 서비 스 지표인 선박 대기율과 생산성 지표인 연간 처리량의 관계에서 최적의 운영 수준을 전략적으로 선택(Trade-off)할 수 있으므로 경쟁 항만 에 대비하여 더 많은 선사 및 화주를 유치할 수 있으므로 터미널 수입도 극대화할 수 있다.

본 논문은 게임소프트웨어학과에서 4학년 학생들이 캡스톤디자인 과목에서 게임제작을 할 수 있도록 대학 4년 교과과정에서 가르쳐야 하는 기술요소들을 구조적으로 분석한 것이다. 게임소 프트웨어학과 학생들이 졸업요건으로 게임제작실습 프로젝트를 수행해야 한다고 가정하고, 이 과정에서 필요로 하는 기술요소를 분석하고, 기술요소들 간의 구조를 분석해 보자는 것이다. 이 는 학생들이 게임제작을 위해 대학 저학년에서 어떤 기술을 배워야 하고 그 기술이 고학년 과 목에서 어떻게 연결되는지 파악할 수 있게 하는 의미있는 작업이 될 것이다. 또한, 통상적으로 교과목명 만으로 구성되어 있는 현재의 교과과정에서 발전하여, 이들 기술요소들의 목록과 구 조적인 위치를 기반으로 게임소프트웨어학과의 보다 구체적인 교과과정을 수립하는데 도움이 될 것으로 판단된다.

Earthquake safety assessment software of the cable-stayed bridge using the seismic acceleration measurement date was developed. Various safety assessment indices for evaluation structural safety and serviceability of bridges are discussed. A systematic approach is proposed to process the raw data for generating appropriate safety assessment indicators. The software for structural state evaluation includes (i) format conversion of raw data, (ii) noise filtering, (iii) generation of assessment index, (iv) state evaluation. Determination of the limit state included in the condition evaluation step is discussed and an example of the graphic user interface of the software is shown.

Earthquake safety assessment software of the cable-stayed bridge using the seismic acceleration measurement date was developed. Various safety assessment indices for evaluation structural safety and serviceability of bridges are discussed. A systematic approach is proposed to process the raw data for generating appropriate safety assessment indicators. The software for structural state evaluation includes (i) format conversion of raw data, (ii) noise filtering, (iii) generation of assessment index, (iv) state evaluation. Determination of the limit state included in the condition evaluation step is discussed and an example of the graphic user interface of the software is shown.

본 연구는 최근에 강조되는 소프트웨어 교육의 배경과 특징을 살펴보고, 소프트웨어 교육과 인공지능에 전제된 사고양식의 문제를 비판하여 새로운 교육 방안을 가설적으로 논의한 것이다. 소프트웨어 교육과 인공지능에 전제된 사고양식은 컴퓨터 연산적 사고 방식이며, 일찍이 브루너가 비판한 패러다임적 사고양식과 관련이 있다. 이 사고양식은 인간 마음을 컴퓨터의 연산장치와 정보처리 장치로 이해한다. 이 양식은, 다양한 해석이 가능하고 복잡한 상황에서 다양한 의미 구성이 이루어지는 인간 마음의 본질적 양식과 는 거리가 멀다. 어느 한 사고양식에 경도되어 있는 SW 교육과 인공지능의 문제는 인간 삶과 밀접하게 관련되어 있는 내러티브 사고양식에 비추어 보면 많은 한계를 지니고 있 다. 양자의 사고양식이 통약 불가능하므로 단순 통합은 어렵지만, 인간 삶의 조건에 혁 신적으로 기여할 수 있는 인공지능과 SW 교육은 이제 ‘도구의 인간’ 관점에 기반하여 정보처리 모형과 의미구성 모형을 실용주의적으로 융합할 수 있는 방안을 모색할 때가 되었다.