• Journal of the Korea institute for structural maintenance and inspection
• /
• v.27 no.2
• /
• pp.42-49
• /
• 2023

When designing fixed jacket structures, overseas design standards are applied due to the absence of domestic design methods. Although the US API standards are mainly applied, API RP 2A suggests two design methods: the allowable stress design method (WSD) and the load resistance coefficient method (LRFD), and is applied according to the designer's judgment. In this study, the stress ratio of the two design methods was reviewed and compared using SACS, an analysis program dedicated to marine structures, for fixed marine structures actually installed on the domestic coast. As a result of the review, it was found that the LRFD design method showed a greater stress ratio for extreme load analysis and transportation analysis, and the WSD design method showed a greater stress ratio for loading and lifting. Therefore, when applying the design method, it is considered appropriate to select the final design method considering safety and economic feasibility after conducting an applicability review for the two design methods.

• Journal of Advanced Navigation Technology
• /
• v.28 no.1
• /
• pp.109-115
• /
• 2024

The Concept of Operations (ConOps) document issued by the Korean Government (K-UAM ConOps) for urban air mobility (UAM) services takes into account not only aviation voice communication but also the use of 4G and 5G mobile communication to support the initial phase of UAM services. This paper studies a methodology to establish communication performance requirements for UAM traffic management and presents the analyzed results for communication performance requirements. To accomplish this, the operational scenarios of UAM developmental stages outlined in the K-UAM ConOps and FAA ConOps are scrutinized, and the diverse messages that must be communicated among various stakeholders for effective UAM operations are identified. A draft of communication performance requirements is also calculated by considering packet sizes, transmission frequencies, acceptable latencies, and availability. The outcomes of this study are expected to stand as a pioneering effort in defining communication requirements for UAM services, providing a crucial foundation for future initiatives such as the design of dedicated communication networks for UAM and the determination of required frequency bandwidth.

• Journal of Korean Foot and Ankle Society
• /
• v.28 no.3
• /
• pp.87-95
• /
• 2024

This study examined the levels of satisfaction from medical staff and patients by analyzing 691 Supreme Court precedents on medical practice from legal disputes in Korea, which are developing into a dual medical system. In addition, the issues that can be prevented in the medical field through the flow and judgment of legal disputes in medical practice after the revision of the medical law are discussed. The concept of medical practice not specified in the Medical Law was examined and compared with the medical-legal systems of Germany, Japan, and the USA through international comparative analysis to assess the illegal factors occurring in the medical field by analyzing the legal approach, medical practice, and medical personnel qualifications of each country. An analysis of the Supreme Court's case law revealed the timing analysis of issues in legal disputes related to medical practice, the incidence rate among the subjects of the cases, and medical personnel to be significant. The meaning was studied by finding the law that applied to it. Important cases were identified, and their meaning was reviewed. The legal issues of medical practice in orthopedics were divided into five sections based on precedents, such as problems in consent to information at the start of treatment, problems in prior radiography before treatment, explanation of the consent process for surgical treatment, problems related to the qualification of operators in the operating room, and the responsibility for postoperative results. In the wake of the recent major crisis in the government's medical reform policy (Essential medical package), procedural problems and legal reviews of illegal medical practices and their qualifications in the medical field were conducted because of the lack of medical personnel.

• Convergence Security Journal
• /
• v.24 no.3
• /
• pp.131-141
• /
• 2024

This study aims to prevent the leakage of research and development results in universities and strengthen their research security systems. To achieve this, we surveyed research security managers at universities in Busan and Gyeongnam on their perceptions and needs, and proposed policy measures to promote research security. The results suggest that policies such as training of specialized personnel in research security, establishing a dedicated research security organization, mandatory education programs, and expanding government support are needed to activate research security in universities. However, the study has limitations due to the small sample size and limited scope to universities in Busan and Gyeongnam. Therefore, further research is needed to expand the scope and improve the research security system.

• Convergence Security Journal
• /
• v.24 no.3
• /
• pp.195-202
• /
• 2024

Future warfare is expected to be multi-domain operations including space, based on the development of advanced information and communication technologies. Advanced space-faring countries such as the United States, Russia, China, and Japan are creating space forces based on advanced space technology to prepare for future space warfare and strengthening cooperation with private companies and other countries. The South Korean military is preparing for space warfare for each type of weapon, but it is still relatively weak in terms of integrated strategy and technology. As not only advanced space countries but also North Korea is increasing its investment in space militarisation, the ROK military needs to develop a comprehensive plan and establish a specialized organisation to prepare for future space warfare. Therefore, this paper examines the current status of the ROK military's space warfare preparedness and proposes space warfare strategies such as establishing a dedicated space warfare and space cybersecurity organization, strengthening domestic and international cooperation, research and development and training of specialized personnel, and reestablishing a training system.

• The Journal of Bigdata
• /
• v.8 no.2
• /
• pp.45-54
• /
• 2023

Seoul's public bicycle system, 'Ttareungyi,' introduced in 2015, has achieved an annual ridership of 40 million in 2022. Similarly, electric scooters, a type of personal mobility device, surpassed one million riders in 2020 due to various sharing platforms. However, the major roadways for these new transportation, bicycle lanes, are notably insufficient compared to other forms of transport. Hence, this study proposes an optimal location selection method for bicycle lanes in Seoul to prevent accidents and enhance bicycle ride safety. The location selection process prioritizes road safety concerning bicycle accident risk. Using regression models, high-risk areas for bicycle accidents are identified. Cluster analysis categorizes these areas into six clusters, each suggesting suitable types of bicycle lanes based on cluster-specific characteristics. We hope that this study will contribute to the improvement of Seoul's transportation environment, including the expansion of dedicated bicycle lanes and lanes for personal mobility devices.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.22 no.1
• /
• pp.252-264
• /
• 2023

This paper proposes a design of a dual-band band-pass filter that integrates a λg/2 open SIR structure, a transmission line, and a fork-type structure with symmetric and asymmetric open stubs. To obtain the dual-band effect, the proposed filter uses the SIR structure and adjusts the impedance ratio of the SIR structure. Therefore, the position of the harmonics of the filter is shifted through the adjustment of the impedance ratio, and this can obtain a double-band effect. In order to obtain the dual-band characteristics, the dual-band effect is obtained by inserting a open stub between the SIR structures with the SIR structure divided in half. In addition, the second frequency response is obtained by adjusting the length of the open symmetrical stub in the fork-shaped structure. The asymmetrical open stub in the fork form achieves optimum bandwidth by adjusting the length. Therefore, the first center frequency of the proposed band-pass filter is 5.896 GHz and the bandwidth is 13.6 %. At this time, the measurement results are 0.13 dB and 33.6 dB. The second center frequency is 5.906 GHz and the bandwidth is 13.6 %. At this time, the measurement results are 0.15 dB and 19.8 dB. The reason is that when the impedance ratio (Δ) is higher than 1, the position of the harmonic is shifted to a lower frequency band. However, if the impedance ratio (Δ) is lowered by one step, the position of harmonics will move to a higher frequency band. The function of the filter designed using these characteristics can be obtained from the measurement result. The proposed band-pass filter has no coupling loss and no via energy concentration loss because there is no coupling structure of input/output and no via hole. Therefore, system integration is possible due to its excellent performance, and it is expected that dedicated short-range communication (DSRC) system applications used in traffic communication systems will be possible.

• Industry Promotion Research
• /
• v.5 no.3
• /
• pp.73-79
• /
• 2020

This study aims to study the problems and solutions of institutional support for the elderly living alone, focusing on the General Support for Living Alone Elderly announced by the Ministry of Health and Welfare in 2018. Results, First, a customized support system for the elderly living alone should be introduced. In order to improve the life satisfaction of the elderly living alone, it is necessary to develop a program that meets the most basic daily life needs, and a specific plan and a support system to link services should be prepared. Second, it is necessary to increase social interest in the elderly living alone. Solving problems for the elderly living alone should be preceded by social interest in the elderly living alone. For this, it is necessary to strengthen the social network. Third, it proposes legislation and amendment for the elderly living alone. Some revisions of existing laws have limitations, and are resolved through individual laws, such as standards and definitions for various types of elderly jobs, reorganization of the delivery system including agencies dedicated to elderly jobs, workers-related regulations, and preferential purchase systems for senior products. It is desirable to do. In conclusion, welfare support for the elderly living alone should be comprehensive and comprehensive. For the welfare of the elderly living alone, personalized care services should be provided first, and social support for the elderly living alone should be promoted on the basis of increasing social interest, and laws and revisions must be actively and proactively made for the elderly living alone.

• Journal of KIISE:Computer Systems and Theory
• /
• v.31 no.7
• /
• pp.402-413
• /
• 2004

This paper presents an Implementation of Korean standard 128-bit block cipher SEED for the small (8 or 16-bits) embedded system using a low-cost FPGA(Field Programmable Gate Array) chip. Due to their limited computing and storage capacities most of the 8-bits/16-bits small embedded systems require a separate and dedicated cryptography processor for data encryption and decryption process which require relatively heavy computation job. So, in order to integrate the SEED with other logic circuit block in a single chip we need to invent a design which minimizes the area demand while maintaining the proper performance. But, the straight-forward mapping of the SEED specification into hardware design results in exceedingly large circuit area for a low-cost FPGA capacity. Therefore, in this paper we present a design which maximize the resource sharing and utilizing the modern FPGA features to reduce the area demand resulting in the successful implementation of the SEED plus interface logic with single low-cost FPGA. We achieved 66% area accupation by our SEED design for the XC2S100 (a Spartan-II series FPGA from Xilinx) and data throughput more than 66Mbps. This Performance is sufficient for the small scale embedded system while achieving tight area requirement.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.21 no.5
• /
• pp.672-678
• /
• 2020

The parallel-feeding operation of an AC traction power supply system has the advantages of extending the power supply section and increasing the power supply capacity by reducing the voltage drop and peak demand caused by a train operation load. On the other hand, the parallel-feeding operation is restricted because of the circulating power flow induced from the phase difference between substations. Moreover, the power supply capacity is limited because of the unbalanced substation load depending on the trainload distribution, which can be changed by the train operation along the railway track. This paper suggests a Thyristor-controlled Phase Angle Regulator (TCPAR) to reduce the circulating power flow and the unbalanced substation load, which depends on the phase difference and the trainload distribution and provides a feasibility study. A dedicated control model of TCPAR is also provided, which uses substation power supplies as the input to control the circulating power flow and an unbalanced substation load depending on the phase difference and the trainload distribution. Simulation studies using PSCAD/EMTDC shows that the proposed TCPAR control model can reduce the circulating power flow and the unbalanced substation load depending on the phase difference and the trainload distribution. The proposed TCPAR can extend the parallel-feeding operation of an AC traction power system and increase the power supply capacity.