• The Journal of the Korea institute of electronic communication sciences
• /
• v.16 no.3
• /
• pp.551-558
• /
• 2021

In this paper, we made the integrated intelligent air ventilation of the actuator module that can be remotely controlled based on IoT and sensors. we implemented a ventilation window system by configuring an algorithm design and a driving circuit to control the operation of the actuator to open and close the ventilation port based on a predetermined number of data that detects indoor gas/CO2/humidity temperature and outdoor fine dust related indoor/outdoor environment. It is difficult to store, manage, and analyze data due to the large number of sensors and conditions for the transmission data of indoor air circulation module. The remote monitoring and remote wireless control screens were constructed to automate the separation and operation conditions by extracting and managing the state. We apply MQTT to enhance big data transmission and construct the system using Rocket MQ to ensure safe transmission of operational big data against system errors.

• Journal of the Korean Society of Radiology
• /
• v.15 no.6
• /
• pp.833-839
• /
• 2021

The Possibility of Denuclearization Verification of Korean peninsula is mentioned. Considering the geographical and linguistic advantages, it is necessary to show willingness to participate in the denuclearization verification. In this study, investigation about nuclear facilities, characteristic of facilities, core resource, operation history, geographic/weather environment were performed. Transport route accessibility analysis and risk analysis for development of transport scenario were performed. Accessibility analysis was classified into airport, port, and vehicle transport. Distance by route, estimated time required, and transit roads were analyzed. In this process, it was possible to confirm the suitability of the vehicle transport scenario. Through follow-up studies, we intend to develop an optimal transport scenario.

• Biomedical Engineering Letters
• /
• v.8 no.4
• /
• pp.365-371
• /
• 2018

Uninterrupted monitoring of multiple subjects is required for mass causality events, in hospital environment or for sports by medical technicians or physicians. Movement of subjects under monitoring requires such system to be wireless, sometimes demands multiple transmitters and a receiver as a base station and monitored parameter must not be corrupted by any noise before further diagnosis. A Bluetooth Piconet network is visualized, where each subject carries a Bluetooth transmitter module that acquires vital sign continuously and relays to Bluetooth enabled device where, further signal processing is done. In this paper, a wireless network is realized to capture ECG of two subjects performing different activities like cycling, jogging, staircase climbing at 100 Hz frequency using prototyped Bluetooth module. The paper demonstrates removal of baseline drift using Fast Fourier Transform and Inverse Fast Fourier Transform and removal of high frequency noise using moving average and S-Golay algorithm. Experimental results highlight the efficacy of the proposed work to monitor any vital sign parameters of multiple subjects simultaneously. The importance of removing baseline drift before high frequency noise removal is shown using experimental results. It is possible to use Bluetooth Piconet frame work to capture ECG simultaneously for more than two subjects. For the applications where there will be larger body movement, baseline drift removal is a major concern and hence along with wireless transmission issues, baseline drift removal before high frequency noise removal is necessary for further feature extraction.

• Journal of Korea Trade
• /
• v.24 no.3
• /
• pp.20-36
• /
• 2020

Purpose - As the global product network expands through both internationalization and diversification of the multimodal transportation system, corporate strategies have shifted to emphasize the importance of a high value-added international logistics system. To guide policies and strategies to attract relevant industries, this study aims to analyze the location competitiveness of regional logistics distribution center to serve Northeast Asia. Design/methodology - Multi-criteria techniques are considered to offer a promising framework for evaluating decision-making factors. This paper employed an analytic hierarchy process to analyze the hierarchal structure of determinants for selecting the location of a regional logistics distribution center. Adopting both qualitative and quantitative evaluations, this study suggest political implications for a regional logistics distribution center development, such as the direction of political support, service differentiation and infrastructure development. Findings - This study developed a location competitiveness evaluation model, based on the case study of the major port-cities in Northeast Asia. Evaluation model incorporates five factors underpinning 17 components extracted using factor analysis. The results revealed that the logistics factor is the most significant factor for evaluating the competitiveness of a regional logistics distribution center. The remaining factors were market, costs, and services environment. Comparing qualitative and quantitative evaluations, results provide useful insights for a regional logistics distribution center development in Northeast Asia. Originality/value - This study revealed differences between qualitative and quantitative evaluations. The finding implies that prior works on evaluation models of competitiveness has not successfully measured the gap between quantitative data and expert' evaluations. To overcome this limitation, this paper considered both actual data such as actual distance, cost, the number of companies located, and expert opinions.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.22 no.5
• /
• pp.241-250
• /
• 2021

This study reviewed details and case studies of district unit planning to preserve and develop urban tissues concerning a historic urban environment and provide implications for future practice. In particular, this case study examined the role of the district unit planning in city conservation rooted in the experience of Incheon's old town. The old town begins with the opening of Incheon Port and concessions, including Japanese, Qing Dynasty, and multinational settlements. Second, the study established land subdivision planning and reviewed the institutions to encourage urban tissue. Third, the conservation guidelines influenced the conservation and utilization of the streets, such as alleys and old coastlines, the form of parcels called deep and narrow lots, and the exterior elements of buildings. This study also derived implications for the future. First, the street with historical value in the settlement should be excavated further. Second, the parcels in the settlement limit redevelopment to maintain the unique morphological characteristics. Third, the exterior of the buildings should be provided with planning incentives to induce conservation and utilization.

• KIPS Transactions on Computer and Communication Systems
• /
• v.11 no.11
• /
• pp.411-418
• /
• 2022

Incorrectly loaded containers can easily knock down by strong winds. Container collapse accidents can lead to material damage and paralysis of the port system. In this paper, We propose a deep learning-based container loading state and accident risk detection technique. Using Darknet-based YOLO, the container load status identifies in real-time through corner casting on the top and bottom of the container, and the risk of accidents notifies the manager. We present criteria for classifying container alignment states and select efficient learning algorithms based on inference speed, classification accuracy, detection accuracy, and FPS in real embedded devices in the same environment. The study found that YOLOv4 had a weaker inference speed and performance of FPS than YOLOv3, but showed strong performance in classification accuracy and detection accuracy.

• Proceedings of the Korean Vacuum Society Conference
• /
• 1998.02a
• /
• pp.17-17
• /
• 1998

Synchrotron radiation is produced when charged particles moving with relativistic velocities a are accelerated - for example, deflected by the bending magnets which guide the electron or p positrons in circular accelerators or storage rings. By using special focusing magnetic lattices i in the particle accelerators it is possible to make the dimensions of the particle beam very small with a hi맹 charge density which results in a light source with high b디lIiance. Synchrotron light h has important properties which make it ideal for a wide range of investigations in surface s science. The fact that the spectrum of electromagnetic radiation emitted in a bending magnet e extends in a continuum from the 얹r infra red region to hard x-rays means that it is id않I for a v variety of spectroscopic studies. Since there are no convenient lasers, or other really bright l light sources, in the vacuum ultraviolet and soft x-ray re.밍ons the development of synchrotron r radiation has enabled enormous advances to be made in this di펌C비t spectr따 re밍on. P Polarization-dependent measurements, for ex없nple ellipsometry or circular dichroism studies a are possible because the radiation has a well-defined polarization - linear in the plane of orbit w with additional right-circular, or left-circular, components for emission an생es above, or below, t the horizontal, respectively. Since the synchrotron light is emitted from a bunch of charge c circulating in a ring the light is emitted with a well-defined time structure with a short flash of l light every time a bunch passes an exit port. The time structure depends on the size of the ring a and the number and sequence of filling of the bunches. A pulsed light source enables time¬r resolved studies to be performed which provide direct information on the lifetimes and decay m modes of excited states and in addition opens up the possibility of using time of flight t techniques for spectroscopic studies. The fact that synchrotron radiation is produced in a clean u ultrahi야 vacuum environment is of gr않t importance for surce science studies. The current t비rd generation synchrotron light sources provide exceptionally high baliance and stability a and open up possibilities for experiments which would have been inconceivable only a short time ago.

• Journal of the Korea Society of Computer and Information
• /
• v.28 no.10
• /
• pp.267-275
• /
• 2023

The digital transformation of the shipbuilding, shipping, and logistics sectors is predicted to lead to the introduction of autonomous ships and changes in the way ships are operated. The co-existence of various operation forms, such as autonomous operation and remote operation, with the existing operation methods is expected to lead to the transformation of the ship operation process and the emergence of new stakeholders. This paper studies the future ship operation process according to the change in ship operation method, predicts the change in the operating environment of future ships, and derives functional requirements by major tasks and stakeholders. The Delphi technique is applied to construct a ship operation scenario from the planning stage of voyage and cargo transport to the stage of arrival at the final destination port and discharge of cargo, and to predict future work changes by task and actor. Seafarers' activities are expected to be minimised by remote and autonomous operation, and experts in each field are expected to have responsibilities and tasks in different aspects of ship operation.

• Journal of Aerospace System Engineering
• /
• v.18 no.1
• /
• pp.99-107
• /
• 2024

This paper introduces an emergency response system in urban air mobility scenarios. A biometric responsive smartwatch was designed to monitor passengers' real-time heart rates. When an anomaly was detected, the system would send an alert via Morse code vibration and voice notification. It was integrated with the assumed control system of the ROS environment and communicates to implement a system for generating the shortest path for emergency landing to a nearby vertical port during urban air mobility operations. System stability was verified through high-fidelity simulation environments and testing based on actual geographic locations. Our technology improved the reliability and convenience of urban air mobility, demonstrating its effectiveness through simulations and tests in real-world scenarios.

• Korean Journal of Environment and Ecology
• /
• v.26 no.5
• /
• pp.654-667
• /
• 2012

To know the effect of construction works at the Busan New Port on the activity of otters, changes in the distribution of spraints were investigated at 5 areas(I-V) composed of 16 locations in 12 islands from 2003 to 2011. There were significant differences among the density of spraints at each area(P=0.0502), at each year(P=0.0040) and at each area during the study period(P=0.0005). The densities of spraints in the areas II (P=0.000) and IV (P=0.012) were significantly different according to whether the construction work was carried out or not at each area. It was found that the density of spraints in each area was affected by the disturbance with construction works or other factors inside and/or outside the area. The average density of spraints of the 5 areas had changed according to the process of the construction works as follows. In 2003-2005 when the construction work was proceeded mainly at the area IV, the average density of spraints of the 5 areas as well as the density in the area II increased annually, whereas the densities in the other 4 areas were low and relatively constant. This fact suggests that otters might have moved into the area II from outside the study area. In 2006-2009 when the construction works were carried out on a larger scale at the areas I, II and III, there was a little decrease in the average density of spraints during the latter two years, suggesting a little decrease in the activity of otters in the study area. As regards the density of spraints at each area, it decreased considerably in the area II, but increased fairly in the areas III and IV. Accordingly it was indicated that otters in the area II where the construction work was carried out since 2006 might have moved into the area IV with no work, and otters inhabiting the Jeodo, Geoje city, where the construction work was carried out at that time, might have moved into the area III with no work at the sea shore. In 2010-2011 when the construction works were conducted at all the areas on a fairly large scale, the average density of spraints of the 5 areas as well as the densities in the areas II, III and IV, decreased considerably compared to the those in the year 2009. This fact clearly indicates that the number of otters decreased owing to the multiple simultaneous works in this period. In conclusion, otters must be affected by the construction works at the study area, and their numbers might be decreased mainly due to the multiple simultaneous works, as well as by the long-term works resulting in the decrease of seashore, marine pollution, and reducing prey available.