• Journal of the Daesoon Academy of Sciences
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• v.48
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• pp.1-40
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• 2024

Time can be the fundamental basis of religious doctrine and the foundation for a life of faith. Therefore, understanding a religion's interpretation of time and exploring its perception is accepted as one of the approaches to comprehending its principles. Based on this idea, this article delves into how chronos (measured time) and kairos (experienced time) are manifested in Daesoon Jinrihoe. In Daesoon Jinrihoe, the moment when chronos and kairos intersect is considered a moment of spiritual experience. Ethical codes are accomplished in the midst of the process of defining this time as the Heavenly Dao and adjusting human affairs accordingly. These ethics lead individuals towards a religious life. East Asian traditions also apply this logic, but Daesoon Jinrihoe differs in that it emphasizes reinterpreted ethics. Furthermore, Daesoon Jinrihoe posits that Degree Numbers (度數) are a device that ensures the transition from chronos to kairos. Degree Numbers, which are both a law of the universe's motion and a function of time, were emphasized by the Kang Jeungsan when he advocated for the discarding of old ways and the creation of the new ways. He thereby urged humans to live in accordance with time. Time is also facilitated in the dimension of ritual observances and participation, with examples including prayers, devotional offerings, and holy works (gongbu, 工夫). Those rituals of Daesoon Jinrihoe actively incorporate a unique basis of reason for this style of engagement with time, which is one of the aspects that is held to secure justification.

• Composites Research
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• v.37 no.1
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• pp.46-52
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• 2024

The development of transportation methods has improved human transportation convenience and made it possible to expand the travel radius of people with disabilities who have difficulty moving. However, in the case of WAV (wheelchair Accessible Vehicle), the safety that may occur in a vehicle accident is still lower than that of regular passenger seats. In particular, in the case of a rear-end collision that may occur in a defenseless situation, it can cause fatal neck injuries to disabled passengers. Therefore, a more detailed design plan must be reflected in the headrest to be applied to WAV. In this study, a multi-cell headrest was proposed to implement local compression characteristic distribution of the headrest during rear-end collision of WAV. Afterwards, a correlation analysis was performed between the passenger's NIC (Neck Injury Criterion) and impact energy absorption using the data set construction through analysis and the clustering results using k-means clustering. As a result of clustering, it was confirmed that data clusters with similar characteristics were formed, and a correlation analysis between NIC and impact energy absorption through the characteristics of each cluster was performed. As a result of the analysis, it was confirmed that the softer the cell compression characteristics in Mid3 and Mid6, the more impact energy absorption increases, and the harder the cell compression characteristics in Front2, Mid3, and Mid6, the more effective it is in reducing NIC.

• Bangmulgwan gwa yeongu (The National Museum of Korea Journal)
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• v.1
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• pp.74-95
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• 2024

A vast body of inscribed bricks has been found connected to the mid-fourth-century Tomb of Jang Mui in Bongsan-gun, Hwanghae-do Province. After several inspections of the bricks conducted at the National Museum of Korea in 2023, these inscribed bricks were grouped into ten types. This paper interprets in detail the phrases written on these bricks from the Tomb of Jang Mui in an attempt to understand their characteristics and intentions. This detailed interpretation facilitates a rough understanding of how each phrase relates to the others and in what order the phrases would make full sentences. In terms of their contents, these inscribed bricks are presumed to have been produced to convey information about the construction of the tomb to viewers on the outside. In particular, they relate that a narrator referred to as a Jubu official named Jo was involved in the construction of the Tomb of Jang Mui. They can be compared to the inscribed bricks created in China during the Western Jin and Eastern Jin Dynasties that were produced not by family members of the tomb occupants, but by figures who participated in the construction of the tombs based on political and social connections to their occupants. During the mid-fourth century, funeral practices in the former lands of the Nangnang and Daebang Commanderies followed Chinese traditions with the permission of Goguryeo Kingdom. Many of the artifacts found inside these Chinese-style tombs and introduced to the public, including the murals, ink inscriptions, and inscribed bricks, are related to the desire of the family members of the tomb occupants to strengthen their bonds and to share emotions and goals with settler groups. The contents of the inscribed bricks discovered from the Tomb of Jang Mui can be observed in this context.

• Journal of Korean Society of Disaster and Security
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• v.16 no.4
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• pp.157-164
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• 2023

The estuary dam is a structure installed and operated in a closed state except when flood event occurs to prevent inland saltwater intrusion and secure freshwater supply. However, the closed state of dam leads to issues such as eutrophication, so it is necessary to examine the extent of saltwater intrusion resulting from the opening of sluice gates. Groundwater, due to its subsurface conditions and slow flow characteristics, is widely analyzed using numerical models. OpenGeoSys, an open-source software capable of simulating Thermal- Hydraulic- Mechanical- Chemical phenomena, was adopted for this study. Simulations were conducted assuming natural flow conditions without dam and operating considering busy farming season, mostly from March to September. Verification of the model through analytical solutions showed error of 3.7%, confirming that OpenGeoSys is capable of simulating saltwater intrusion for these cases. From results simulated for 10 years, considering for the busy farming season, resulted in about 46% reduction in saltwater intrusion length compared to natural flow conditions, approximately 74.36 m. It may be helpful to make choices to use groundwater as a water resource.

• Korean Journal of Optics and Photonics
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• v.35 no.4
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• pp.150-156
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• 2024

One of the key factors in research regarding long-distance laser beam propagation, as in free-space optical communication or laser power transmission, is the transmission efficiency of the laser beam. As a way to improve efficiency, we perform extensive numerical simulations of the effect of modifying the laser beam's profile, especially replacing the fundamental Gaussian beam with a super-Gaussian beam. Numerical simulations of the transmitted power in the ideal diffraction-limited beam diameter determined by the optical system of the transmitter, after about 1-km propagation, reveal that the second-order super-Gaussian beam can yield superior performance to that of the fundamental Gaussian beam, in both single-channel and coherently combined multi-channel laser transmitters. The improvement of the transmission efficiency for a 1-km propagation distance when using a second-order super-Gaussian beam, in comparison with a fundamental Gaussian beam, is estimated at over 1.2% in the singlechannel laser transmitter, and over 4.2% and over 4.6% in coherently combined 3- and 7-channel laser transmitters, respectively. For a range of the propagation distance varying from 750 to 1,250 m, the improvement in transmission efficiency by use of the second-order super-Gaussian beam is estimated at over 1.2% in the single-channel laser transmitter, and over 4.1% and over 4.0% in the coherently combined 3- and 7-channel laser transmitters, respectively. These simulation results will pave the way for future advances in the generation of higher-order super-Gaussian beams and the development of long-distance optical energy-transfer technology.

• Journal of Platform Technology
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• v.12 no.2
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• pp.34-44
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• 2024

This paper proposes a dynamic clock supply control algorithm and a system load power stabilization algorithm that minimizes the power consumption of the sensing system, which accounts for the largest percentage of power consumption in mobile devices, to extend the usage time of the rechargeable battery mounted on the mobile device. The dynamic clock supply control algorithm can reduce the power consumed by the sensing system by configuring a circuit to cut off the power of the sensing system and by recognizing the state of low sensor change and adjusting the measurement cycle. The system load power stabilization algorithm is an algorithm that controls the power of the surrounding module according to the power consumption state, and when it requires a lot of power, it controls the clock supply to stabilize the operation. The experimental results confirmed that applying only the dynamic clock supply control algorithm reduces the power consumed by the sensing system by 17%, and applying only the system load power stabilization algorithm reduces power consumption by 9.3%, enabling it to operate stably in situations that require a lot of power such as image processing. When both algorithms were applied, the power consumption of the battery was reduced by 67% compared to before applying the algorithm. Through this, the reliability of the proposed method was confirmed.

• Journal of the Korean Institute of Landscape Architecture
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• v.52 no.4
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• pp.86-103
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• 2024

This study interprets the evolving ideologies of Singapore's urban environmental policies focusing on the meanings encapsulated within the notion of 'garden'. Through a comprehensive review of policy documents, legislative materials, development projects, government promotional materials, and organizational changes in each era, the study identifies three phases, each with distinct central themes. Commencing in the 1960s, the initial phase projected a meticulously controlled and managed cityscape using the notion of garden, which was epitomized by the slogan 'Garden City'. In this phase, garden was a representative concept that embodied the cleanliness and greenness of the city, and also served as a strategic rhetoric to effectively transfer the ideology of an exemplary picturesque city to the public. Subsequently, in the 1970s, the focus gradually shifted from individual green spaces and bodies of water towards a collective system which served as a foundational infrastructure of the city-nation. This evolution was reflected in the new slogan 'City in a Garden', where the garden is now not only summoned for its external appearance but also as an unified system which serves as the cornerstone of the city. Through these phases, the Singaporean government developed a scheme capable of integrated management of green spaces and water resources tailored to the scale and function of each. Building upon this foundation, the early 2000s saw the adoption of a new orientation focusing on sustainability and urban ecology, encapsulated in the revised slogan 'City in Nature'. For more than five decades, Singapore has demonstrated an adept utilization of the notion 'garden'. This scholarly examination underscores Singapore's journey in redefining urban landscapes through the strategic employment of the concept of garden in its urban environmental policies. By tracing the evolution of the garden concept across distinct phases, the study illuminates how the Singaporean government leveraged the garden's versatility: from an effective metaphor of aesthetic values to an integral component of its holistic urban system, and finally to a bridge between the urban and the natural.

• Journal of Korean Society of Forest Science
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• v.113 no.3
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• pp.339-348
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• 2024

Debris flow is a typical type of mountainous sediment disaster that can cause widespread damage to both lives and property, making it essential to understand its behavioral characteristics for effective prevention. In this study, pre- and post-event Light Detection And Ranging(LiDAR) data from the Dosan-ri area in Bonghyeon-myeon, Yeongju-si, Gyeongsangbuk-do, Republic of Korea where debris flows occurred in 2023, were used to calculate the actual affected area and terrain change volume caused by the debris flow. These calculated values were then compared with those derived from the numeric simulation model, Morpho2DH, based on field surveys and laboratory investigation data. Additionally, the model's applicability was assessed by conducting cross-sectional elevation analyses based on the extent of the affected area and comparisons of the results. The findings indicate that the debris flow affected area and terrain change volume estimated by the Morpho2DH model were approximately 152% and 178% higher, respectively, compared to the LiDAR-based results. Pearson correlation analysis of the cross-sectional elevation changes showed a positive correlation, with Pearson Correlation Coefficients(PCC) of at least 0.65

• Korean Journal of Mineralogy and Petrology
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• v.37 no.2
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• pp.59-66
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• 2024

This study aimed to understand the mineral characteristics of the sediment from the summit of Magellan Seamount KC-7. In December 2023, approximately 20 years after the Korea Institute of Ocean Science and Technology conducted an initial field investigation of the sediment from the summit of seamount KC-7 in 2004, were obtained and subjected to mineralogical analysis to determine the essential sedimentary environmental characteristics of the seamount summit. For this purpose, smear slide analysis through a polarized microscope and X-ray diffraction analysis were conducted. The total length of the obtained sediments was 672.7 cm, and they were generally composed of calcareous ooze. In the lower part of the sediments (283.7-672.7 cm), Discoaster groups and coccoliths were predominantly observed. However, in the upper part above 283.7 cm, both coccoliths and foraminifera began to appear together, and in the uppermost sediments (0-151.7 cm), foraminifera became dominant, and the grain size of the sediments increased. This reflects a shift in the marine environment from high temperature and eutrophic conditions to low temperature and oligotrophic conditions as the seamount moved to its current position, aligning with the present oligotrophic environment of the western Pacific. The sediments comprised clay minerals, quartz, feldspar, and calcite. Examining the content changes of the four major mineral groups with depth, calcite was the most predominant, averaging 89.8 wt%. However, towards the upper layers, there was a trend of increasing clay content (up to 12.1 wt%) and decreasing calcite content (down to 85.1 wt%). This indicates that while the sedimentation mechanism remained unchanged, there has been a gradual influx of aeolian sediments.

• Journal of the Korean Geotechnical Society
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• v.40 no.5
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• pp.77-92
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• 2024

This study investigates the impact of aluminum and water pollutants present in the effluent from wastewater treatment plants associated with agricultural and industrial facilities in the Geumgang waterway. The average aluminum concentration in the effluent from these facilities ranged from 0.19-3.14 mg/L. The R² values between the predicted and measured values at the confluence were 0.9237 and 0.9758, respectively, with an average aluminum concentration of 0.051 mg/L observed 10 km downstream. During the model calibration process, QUALKO2 outperformed QUAL2E, showing percent bias values of less than 11.9% and 18.9% for BOD and Chl-a, respectively. However, both models demonstrated similar performance in predicting T-N and T-P concentrations, as they both consider abiotic organic nitrogen and phosphorus. In conclusion, the impact of aluminum and water pollutants in the effluent from the Geumgang River agricultural and industrial complex wastewater treatment plant is relatively low. Nonetheless, for the safety of drinking water, continuous monitoring and proper maintenance of aluminum levels and water quality are essential.