A three-dimensional digital image processing technique is proposed to quantitatively predict the dispersion phenomena of oil droplet onto the surface of the water. This technique is able to get the dispersion rate of an oil droplet three-dimensionally just below the surface of the water over time. The obtained dispersion rate obtained through this technique is informative to the investigation into the relationship among the gravity, surface tensions between oil, water, and air. This technique is based upon the three-dimensional PIV(Particle Imaging Velocimetry) technique and its system mainly consists of a three CCD(Charge Coupled Device) cameras, an image grabber, and a host computer in which an image processing algorithm is adopted for the acquisition of dispersion rate oil an oil droplet.

이 논문은 정치망에서의 어군의 입망상태를 원격으로 감시하기 위하여 개발한 디지털 원격 어군 탐지기의 구성과 실험 결과에 대하여 기술한다. 그 원격 어군탐지기는 해상국와 육상국으로 구성하였다. 전자는 50 kHz의 초음파 송수신부, 자작한 16비트 싱글보드컴퓨터, 데이터 링크용 무선모뎀으로 구성하였다. 싱글보드컴퓨터는 초음파펄스 송신용 트리거 신호, 최대탐지거리, A/D 변환기의 샘플링 간격, 데이터 링크를 제어한다. 에코 데이터의 샘플링 간격은 80μs로 하였다. 후자는 해상국과 동일한 무선 모뎀, 에코그램을 표시하고 그 때의 raw data를 저장하는 노트북 컴퓨터로 구성하였다.필자는 시험 제작한 원격 어군탐지기의 실용성을 확인하기 위한 현장 실험을 행하였다. 그 결과, 얻어진 에코그램은 정치망내의 어군행동을 감시하기에 충분하게 양호하고 명료하였다.

Since the digital chart consists of a large number of points, the effective method for the coastline data compression(CDC), storing the data compactly and reproducting the coastline feature accurately, is important. In the CDC, the key technique is to determine the optimal positions as node points in given coastlines. In this paper, a new CDC method, selecting node points with conspicuous coast positions in the view point on navigation and adopting spline interpolation to the nodes partly, is proposed. Using the northern part of KEOJE-DO coastline in Korean chart No.204, CDC experiments are carrie out with various compression ratio. The results fro the influence of coastline shape according to various CDC methods are discussed and presented.

도시의 환경문제가 인구와 시설의 증가에 의해서 점점 더 심각해짐에 따라 도시내 산림을 도시에서 가장 중요한 부분으로 인식하고 있다. 따라서 본 연구에서는 대전지역에서 도시내 또는 도시외곽에 위치한 산림을 합리적으로 관리하고 이용하기 위한 기본적 분석 단계로서 산림지역의 지형환경을 Landsat - 5 TM데이타와 수치지형자료를 이용하여 분석하였다. Landsat - 5 TM의 영상자료로부터 산림지역을 추출하였고, 수치지형자료를 이용하여 표고, 경사도, 주경사향의 분포를 분석하였다. 영상자료로부터 추출한 산림지역에서 특히 보문산, 봉산, 갑하산, 식장산과 계족산의 5개 지역을 대상으로 지형환경 분석이 이루어졌다. 대전지역에서 산림지역이 차지하는 면적비율은 55.1%로 도심지역보다 약 5배 많은 며적이다. 전체 산림지역의 표고 분포는 200m 이하가 70.8%이고, 400m 이상은 4.8%이다. 5개 지역에서 계족산은 100~200m 지역의 전체의 45.7%, 보문산은 300m 이하 지역이 92.4%이다. 갑하산과 식장산에서 300m 이상되는 지역은 각각 20.4%와 46.6%이다. 도시내에 위치하고 있는 봉산을 제외하고 모든 지역에서 50% 이상이 경사 20˚ 이상의 급경사지로 구성되어 있다. 특히 식장산에서는 30˚ 이상의 절험지가 35.2%나 분포하고 있다. 식장산과 갑하산은 보문산, 계족산보다 고도, 경사도 변화가 심한 것으로 나타났다.

오대산 국립공원지역의 지형을 파악하기 위하여 1:50.000 지형도를 입력하여 100×100m 격자의 수치고도모델을 구축하였다. 오대산 국립공원 전체의 55%가 900m 이상인 고지로 되어 있고. 비로봉 자연보전지역은 90%가, l,100m 이상인 고산지역이다. 경사 20˚이상인 지역이 70% 정도로 험준한 산악지역이며, 경사향은 주로 동향과 서향으로 나타나고 있다.

Modal Analysis is the process of characterizing the dynamic properties of an elastic structure by identifying its modes of vibration. A mode of vibration is a global property of an elastic structure. That is, a mode has a specific natural frequency and damping factor which can be identified from response data at practically any point on a structure, and it has a characteristic mode shape which identifies the mode spatially over the entire structure. Modal testing is able to be performed on structural and mechanical structure in an effort to learn more about their elastic behavior. Once the dynamic properties of a structure are known its behavior can be predicted and therefore controlled or corrected. Resonant frequencies, damping factors and mode shape data can be used directly by a mechanical designer to pin point weak spots in a structure design, or this data can also be used to confirm or synthesize equations of motion for the elastic structure. These differential equations can be used to simulate structural response to know input forces and to examine the effects of pertubations in the distributed mass, stiffness and damping properties of the structure in more detail. In this paper the measurement of transfer functions in digital form, and the application of digital parameter identification techniques to identify modal parameters from the measured transfer function data are discussed. It is first shown that the transfer matrix, which is a complete dynamic model of an elastic plate structure can be written in terms of the structural modes of vibration. This special mathematical form allows one to identify the complete dynamics of the structure from a much reduced set of test data, and is the essence of the modal approach to identifying the dynamics of a structure. Finally, the application of transfer function models and identification techniques for obtaining modal parameters from the transfer function data are discussed. Characteristics on vibration response of elastic plate structure obtained from the dynamic analysis by Finite Element Method are compared with results of modal analysis.

The paper presents a digital speed control approach of induction motor systems by using a digital redesign method and adopting a well known 2nd order model as the system model equation. The basic concept using the modeling equation is induced from the control theory stand point such that we can describe usually the motor system connected by inverter, generator and load etc. just as a mechanical system to be controlled. The concept does not demand us the complicated vector-based modeling equation adopted in the traditional methods for the speed control of induction motor. The effectiveness of the servo control system composed by the above mentioned design concept is illustrated by the experimental results in the presence of step reference change and generator load variation. It is observed from the experimental results that the steady state error of the experimental set up becomes zero after some regulation time and the induction motor system is robust in spite of reference signal change and load variation of generator.

이상과 같이 엑튜에이터의 동특성 해석을 행하고 PID 제어기 및 최적 제어기를 설계하여 응답시뮬레이션을 한 결과 다음과 같은 결론을 얻었다. 1) 엑튜에이터 부의 시정수는 엔진 부의 시정수에 비해 아주 작아 생략하여 제어계를 구성할 수 있다. 2) 한계 감도법에 의해 PID 제어기를 시뮬레이션 한 결과 PID 제어 가버너는 전반적으로 오버슈트가 크고 중속 및 고속 상태에서는 정정시간이 비교적 짧지만 저속에서는 정상 상태에 도달하는데 상당한 시간이 걸린다. 3) 중량 matrix를 적당히 선택하여 최적 피이드 백 게인을 구한 후 마이크로 프로세서에 저장하여 제어기를 구성하면 PID 제어기 보다 양호한 응답 특성을 갖는 제어기를 설계 할 수 있다.

A scheme for installing the digital printing devices as an additional output system of photoelectric photometry is discussed. The digital printing devices consist of counter/integrator and printer interfaces for the digital printer HP 5055A. The integration gate time could be adjusted from 1 second to 99 seconds.

With the wave of digital economy sweeping the world, artificial intelligence, blockchain, cloud computing, 5G, ChatGPT and other information technologies are developing rapidly. All walks of life are undergoing changes, and people’s thinking, cognition, life, study, and work are changing accordingly. Both developed and developing countries are also facing new situations and challenges in politics, economy, science and technology, culture, and education. It can be said that digitalization itself and its impacts are related to the development of the future world and affect every citizen of the earth. Digital literacy and skills derived from digitalization have gradually become the focus of attention from all walks of life. In terms of college students’ digital literacy and digital literacy skills, it mainly refers to the digital ability that college students should have and use in study, employment, and future work under the background of informatization and digitalization. Although digital literacy and digital literacy skills have been paid more and more attention by the international community and schools, there is no unified definition of digital literacy and digital literacy skills by various countries and international organizations, and there are some differences in the use of this concept by countries and regions. From the perspective of enterprises’ demand for digital talents, this paper puts forward some suggestions on the training and improvement of college students’ digital literacy skills.

Big data, artificial intelligence and other cutting-edge technologies are gradually integrated with the real economy, promoting modern society to the development stage of digital economy, and the emergence and development of new industrial trends will inevitably suffer from realistic challenges, at this time, it is necessary to respond to the challenges in a targeted manner.Based on this, this paper analyzes the realistic challenges of the digital transformation of the sports industry, and on the basis of clarifying the existing challenges and difficulties, puts forward the promotion strategy of the digital transformation of the sports industry from multiple perspectives for reference.

As nuclear decommissioning ventures become increasingly complex, the role of digitalization in facilitating and enhancing these operations is becoming indispensable. This transition to a more digitized approach presents a myriad of advantages, including: augmented avenues for data acquisition, analysis, and visualization to bolster dismantling strategies; simulations in virtual environments for operator training; precise forecasting of future waste emergence, culminating in refined cost estimations; and more immersive decommissioning visualizations for both operators and external stakeholders. Salient benefits conferred by the integration of digital technologies in decommissioning encompass improved collaboration, enriched knowledge transfer, clarity regarding present technological constraints, insights into key influencing factors, clearer criteria for technology selection, and a profound understanding of the potential challenges and merits of a broader incorporation of digital tools in decommissioning endeavors. Of paramount importance is the opportunity presented for superior workforce training and safety measures, exemplified by ALARAbased planning. Amidst the myriad facets of digital adoption, 3D modeling of nuclear facilities derived from laser-scanned point clouds stands out as a pivotal domain in the digitalization. The transformation of intricate point cloud data into a comprehensible 3D mesh remains the crux of this paper. The process of mesh generation, despite being simpler than its counterpart of converting to a 3D solid model, is crucial for multiple reasons. The resultant 3D mesh offers an enhanced visual representation compared to a sparse point cloud, paving the way for improved spatial perception. Furthermore, it serves as a rudimentary tool for approximating component volumes and the ensuing waste, thereby playing an instrumental role in waste manipulation strategies, notably in collision detection. This paper delves deep into the nuances of mesh generation, conducting an parametric study of mesh conversion algorithms, including down-sampling rates. Through this rigorous examination, we endeavor to shed light on optimal methodologies, hoping to catalyze advancements in the digitalization of nuclear decommissioning processes.

The current domestic gaming market is flourishing, with a multitude of games centered around or incorporating elements of traditional culture. Notably, exceptional cases such as “Black Myth: Wukong” have even succeeded in exporting culture overseas. However, beneath this prosperity lie certain challenges. Most games that revolve around traditional culture suffer from certain gaps and lack subsequent work. Only a few manage to evolve into series. This paper primarily explores the feasibility and advantages of the IP economic model in propagating traditional culture through digital games, aiming to uncover novel strategies for disseminating traditional culture in the digital gaming realm.

The development of the Internet and digital technology has given rise to a new form of cultural industry - digital literacy, and the trend of all-media convergence has also promoted the production and marketing of IP, and the space for the development of digital literacy under the IP strategy and the market demand are constantly expanding. Due to the problems of insufficient exploitation and utilisation, low technology level, content homogenisation and serious piracy of China's IPs, the feasible paths of building a digital cultural and creative industry chain, all-media marketing, establishing a digital copyright protection system, guiding the orderly competition of IPs, and carrying out international cooperation have been put forward with the combination of theories and practices, to improve the efficiency of IP production, content quality and digitalisation, stimulate the innovation of content and science and technology, protect digital copyrights, and provide a better service for China's high-quality digital copyright production and marketing. Protection of digital copyright, and provide a reference for the creation of high-quality digital cultural and creative IP in China.

국제무역에서 디지털화는 새로운 시장과 고객에 대한 접근을 촉진하고 국경 간 거래를 활발하게 하며, 거래 참여 비용을 절감하는 등 다양한 이점을 가진다는 점에 의의가 있다. 디지털 무역의 시대가 오면 서 과거의 전통적인 금융 리스크와는 다른 양상을 보이기 시작했다. 중국에서는 비부금(備付金) 리스 크, 자금 남용 리스크, 자본 유동성 리스크가 나타나고 있으며, 이에 대한 관리 방법으로 비부금(備付 金)을 중앙에서 관리하고, 은행 감독 수준을 제고하며, 정부 신용제도 개선을 고안했다. 한국에서는 디 지털 권리침해 리스크, 상품의 하자, 배송지연 및 미배송, 판매자의 계약 위반에 대한 구제거부 등 구매 자의 리스크와 제품의 불량 혹은 파손, 오배송 및 배송지연 등에 따른 구매자의 환불 및 교환 요구, 블 랙컨슈머 등 판매자의 리스크가 존재한다. 이를 해결하기 위한 방법으로는 협력체계 구축, 오픈마켓의 분쟁 해결 서비스, 신용카드 차지백 서비스 활용, 판매자 약관의 확인, 거래 프로세스의 개선, 거래 관 련 증빙 확보, 블랙컨슈머 리스트 공유를 제시했다. 급변하는 국제무역 체계를 따라잡기 위해서는 정부 의 노력이 있어야만 한다. 디지털 무역에 대한 모니터링을 지속하고, 변화에 맞춰 즉각 대응할 수 있도 록 체계적인 시스템 구축이 필요할 것으로 보인다. 디지털 무역의 성장이 급속하게 일어난 만큼 아직 디 지털 무역의 리스크 및 리스크 관리에 대해서 규범과 체계가 상대적으로 미비한 실정이다. 디지털 경제 강국이 되기 위해서는 글로벌 쟁점에 관심을 가지고 국가 간의 협력이 활발하게 이루어져야 한다고 본 다.

Analyzing and comparing the digital trade rules of free trade zones such as the European Union (EU) and North America is significant for the localization of China’s digital trade rule system. In this paper, the significance of digital trade rules is demonstrated by analyzing and comparing the characteristics of digital trade rules in each regional agreement. Through analysis of the digital trade rules of each region, it is proposed that the construction of digital trade rules in China needs to be based on promoting the development of digital economy, strengthening the protection of digital security and improving data crossborder circulation rules.

The art field of contemporary society is developing rapidly, and digital media is developing at a high speed. The installation art, which is rooted in contemporary art, has gradually become an important art form of new media art with its unique conceptual, experimental, on-site and interactive nature. In the late 20th century, the media scene has become more diversified with the development of science and technology, and the creation form and content of installation art have been more fully developed, and once became the patent of avant-garde fashion designers. On this basis, with the help of outdoor art behavior, the article makes an in-depth exploration and research on the integration and development of digital media technology and installation art.

The recent introduction of numerous outstanding tabletop games from Europe and America, coupled with the thriving domestic tabletop game crowdfunding platforms, highlights the huge potential of the board game market in China. Additionally, studies have demonstrated that board games not only provide leisure and entertainment, but also have a positive impact on children’s education, corporate management, and the medical field. However, the Chinese board game industry is facing certain challenges in the digital age. The lack of excellent domestic board game works, designers, and brands are hindering its development. This paper examines the Chinese tabletop game brands from a digital perspective and offers suggestions for the building of strong Chinese board game brands.

The decommissioning of a nuclear power plant is a project that consists of several stages, and various technologies are applied when performing various tasks at each stage. And it is essential to secure safety and economic feasibility. As the paradigm has changed due to digital transformation in various industries, digitalization is applied to the life cycle of nuclear power plant from construction, operation and decommissioning project. Element technologies are being developed for decommissioning plan establishment, process design, econtamination method, decommissioning work process, waste management, environmental monitoring and radiation dose simulation. The utilization of digital twin in the decommissioning stage is classified into three categories. ① Process Monitoring (decommissioning work procedure, work progress (plan/actual), real-time work status and etc.) ② Facility Monitoring (real-time sensing and video data monitoring, decommissioning SSCs information, work alarm and etc.) ③ Safety Monitoring (work safety, radiation exposure, fire monitoring, work risk and etc.) A system suitable for the decommissioning stage and work should be developed in consideration of the target of use, development function, and when to create data according to the purpose of the system. Simulation module according to user purpose should be provided. In addition, data-base management should be performed according to the decommissioning characteristics in consideration of the data associated with the existing operating system. The system to be developed should support the project management to comply with the domestic standards and regulations to be determined in the future. This will improve the competitiveness of domestic and foreign markets.