• 대한의용생체공학회:의공학회지
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• 제17권2호
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• pp.241-246
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• 1996

This paper describes a new system that detects radial pulse wave and allows the diagnosis of malfunctions of cardiovascular system by analyzing the waveforms with the newly proposed algorithm. The system consists of a sensor part and a data processing part within which a new detection algorithm is incorporated In acquiring radial pulse signal noninvasively, the sensor used in this system is a new combinational fiber-optic sensor which has a detecting Part and a transmitting Part. Also, In order to analyze the characteristics of pulsation quantitatively, the algorithm proposed in this paper is a method that runs in parallel with both the data of ECG and differential pulse simultaneously. these concepts are based upon the idea that thfee Q points of ECG give obious discrimination of one entire period of pulse in any abnormal cases, and newly defined feature lines at the differential counterpart can be used to recogrlize sDme significant points in one period of pulses.

• Journal of Chest Surgery
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• 제21권2호
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• pp.403-407
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• 1988

Primary tumors of the diaphragm are very rare, From a clinical point of view, they do not present a specific symptomatology and the radiologic aspect is not characteristic. Their etiology is often obscure. The authors experienced one case of primary neurofibroma of the diaphragm. The patient was 52 year old male, and detected preoperatively abnormal round mass shadow in the middome portion of the left diaphragm in routine chest X-ray. A left posterolateral thoracotomy through the 7th ICS was performed. The mass and surrounding tissues were completely removed, and diagnosed as a primary neurofibroma by the histopathologic findings. Postoperative course was uneventful.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2003년도 춘계학술대회논문집
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• pp.67-71
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• 2003

In order to manage a cluster system that consists of a number servers, management aspects such as configuration management, fault management, performance management, and user management should be considered. Especially, it is necessary to monitor performances for performance and fault management. An agent in each server collects performance counters, status changes, and events occurred in normal or abnormal states. The data collected are delivered to a collector sorter and processed in a report tool for performance analysts and management decision in the cluster system point of view, by detecting fault state and tracing out resource usage, service response, and response, and states until failed. In this paper we propose an architecture modeling of a performance report tool for proactive cluster system management. Some results on a cluster system are presented.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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• pp.1438-1440
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• 2005

A power control and distribution unit(PCDU) plays roles of protection of battery against overcharge by active control of solar array generated power, distribution of unregulated electrical power via controlled outlets to bus and instrument units, distribution of regulated electrical power to selected bus and instrument units, and provision of status monitoring and telecommand interface allowing the system and ground operate the power system, evaluate its performance and initiate appropriate countermeasures in case of abnormal conditions. In this work, we perform the preliminary design of a PCDU scheme for the small LEO Satellite applications. The main constitutes of the PCDU are the battery interface module, the auxiliary supply modules, solar array regulators with maximum power point tracking(MPPT) technology, heater power distribution modules, internal converter modules for regulated bus voltage generation. and instrument power distribution modules.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2019년도 춘계학술발표대회
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• pp.394-397
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• 2019

센서 및 정보 통신 기술의 발전은 산업 현장에서 취득한 정보를 기반으로 다양한 연구를 수행할 수 있는 토대가 되었다. 본 연구에서는 철도의 진로 방향을 전환하는 선로 전환기 주변에 설치한 소리 센서에서 수집한 소리를 기반으로 선로 전환기의 이상 상황을 탐지하고자 한다. 이와 같은 소리 데이터 기반의 이상 상황 탐지 시스템을 실제 산업 현장에서 성공적으로 운용되기 위해서는 소리 취득 시 발생하는 다양한 잡음 환경에서도 이상 상황을 식별할 수 있는 강인함이 보장되어야 한다. 본 논문에서는 소리 음질을 향상시키기 위하여 SEGAN(Speech Enhancement Generative Adversarial Network)을 활용하며, CNN(Convolutional Neural Network)을 기반으로 선로 전환기의 이상 상황을 식별하는 시스템을 제안한다. 수집된 소리 데이터를 기반으로 제안한 시스템을 실험적으로 검증한 바 잡음에 강인한 성능을 확인하였다.

• International Journal of Advanced Culture Technology
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• 제11권3호
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• pp.83-88
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• 2023

The increasing global average temperature and the emergence of various abnormal climate phenomena are already being experienced in reality. The problems arising from climate change are expanding and becoming catastrophic, despite the efforts of various organizations to prevent them. In order to avoid climate issues from becoming black elephants, we conducted interviews with emergency planning officer from various institutions to identify potential X-events caused by climate change. The results of analyzing the anticipated X-events by these emergency planning officer revealed a chain of ripple effects associated with their occurrence. This implies that once an X-event happens, its influence is broader and more significant. Through this study, we aim to share the understanding of the ripple effects of climate X-events with many people, raising awareness of the severity of climate issues. We hope that this will serve as a starting point for more institutions, individuals, and nations to make efforts in resolving climate problems, turning X-events into opportunities rather than crises.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 가을 학술논문 발표대회
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• pp.186-187
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• 2020

Damage to temporary facilities and structural members caused by excessive loads in the field continue to occur. If the load can be monitored in advance, the risk can be prevented. In this study, a load cell sensor is installed under the system support, and load data is wirelessly transmitted through a Bluetooth AP(wireless). Risk prediction system is proposed through an construction alarm when an abnormal load occurs through real-time multi-point monitoring by sensor location.

• Journal of Korean Neurosurgical Society
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• 제67권3호
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• pp.265-269
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• 2024

Pediatric central nervous system (CNS) vascular malformations are a group of abnormal blood vessel formations within the brain or spinal cord in children. The most crucial point of pediatric CNS vascular malformation is that no golden standard classifications exist. In addition, there is a big gap in knowledge and the viewpoint of clinicians, radiologists, and pathologists. In addition, many genes associated with pediatric CNS vascular malformation, such as Sturge-Weber-Dimitri syndrome with guanine nucleotide-binding protein G(q) subunit alpha (GNAQ) gene mutation, and cavernous malformations with cerebral cavernous malformations 1 (CCM1), CCM2, and CCM3 gene mutation, were recently revealed. For proper therapeutic approaches, we must understand the lesions' characterizations in anatomical, morphological, and functional views. In this review, the author would like to provide basic pediatric CNS vascular malformation concepts with understandable diagrams. Thus, the author hopes that it might be helpful for the proper diagnosis and treatment of CNS pediatric vascular malformations.

• Journal of Positioning, Navigation, and Timing
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• 제4권2호
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• pp.57-65
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• 2015

Global Navigation Satellite System (GNSS) including Global Positioning System (GPS) is an important element for navigation of both the military and civil Unmanned Aerial Vehicle (UAV). Contrary to the military UAVs, the civil UAVs use the civil signals which are unencrypted, unauthenticated and predictable. Therefore if the civil signals are counterfeited, the civil UAV’s position can be manipulated and the appropriate movement of the civil UAV to the target point is not achieved. In this paper, spoofing on the autonomous navigation UAV is implemented through field experiments. Although the demanded conditions for appropriate spoofing attack exists, satisfying the conditions is restricted in real environments. So, the Way-point of the UAV is assumed to be known for experiments and assessments. Under the circumstances, GPS spoofing signal is generated based on the Software-based GNSS signal generator. The signal is emitted to the target UAV using the antenna of the spoofer and the effect of the signal is analyzed and evaluated. In conclusion, taking the UAV to the target point is hardly feasible. To implement the spoofing as expectation, the position and guidance system of the UAV has to be known. Additionally, the GPS receiver on the UAV could be checked whether it appropriately tracks the spoofing signal or not. However, the effect of the spoofing signal on the autonomous UAV has been verified and assessed through the experimental results. Spoofing signal affects the navigation system of the UAV so that the UAV goes off course or shows an abnormal operation.

• 대한치과보철학회지
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• 제29권3호
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• pp.121-140
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• 1991

Fifteen dental college students of Chosun University without the abnormal occlusion, the history and symptom of temporomandibular dysfunction(TMD), and who had all permanent teeth except third molar and the fifteen moderate group and the fifteen severe group classified according to Helkimo's dysfunction index among patients on the basis of the symptom of TMD were selected. The occlusal contact, occlusal force and occlusal interference in eccentric movement was studied and analyzed using T-Scan system. The result were as follows : 1. The TLR centering around midsagittal axis was located at $1.42{\pm}0.82mm$ in control group, $3.36{\pm}1.45mm$ in severe group, and as TMD was heavier, occlusal contact was located at the farther point from midsagittal axis. 2. The PLR from the first contact to the fifth contact centering around midsagittal axis was located at $1.73{\pm}1.78mm$ in control group, $3.36{\pm}1.41mm$ in moderate group, and $5.39{\pm}4.32mm$ in severe group, and as TMD was heavier, occlusal contact was located at the farther point from midsgittal axis. 3. The TFB, PFB, RFB and LFB of occlusal contact centering around incisal axis had no significant difference statistically among control group, moderate group, and severe group, and it was located at first molar. 4.The LF and RF was smaller in TMD group than in control group. 5. The LR moment of occlusal force centering around midsagittal axis was located at $178.51{\pm}139.81N.mm$ in control group, $466.25{\pm}296.47N.mm$ in moderate group, and $749.18{\pm}588.18N.mm$ in severe group. And as TMD was heavier, it was located at the farther point from midsagittal axis. 6. The RL and LL of occlusal force centering around incisal axis had not-significance statistically among control group, moderate group, and severe group, and it was at the first molar. 7. The number of occlusal interference of the eccentric movement was increased in the patients of TMD.