• Journal of Yeungnam Medical Science
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• v.6 no.1
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• pp.179-184
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• 1989

The Marfans syndrome is a generalized connective tissue disease involving eye, musculoskeletal system, cardiovascular system, and inherited autosomal dominant with various expression type. The cardiovascular complications such as aortic aneurysm, aortic dissection, aortic regurgitation, mitral regurgitation and aortic dissection which usually occurs in previously normal sized aorta are poor prognostic factors. However, the aortic dissection which developed in patient with Marfan syndrome and aortic aneurysm was rare. We experienced one case of dissecting aneurysm in patient diagnosed as previous aoritc aneurysm, aortic regurgitation, and Marfan syndrome, receiving successful operation.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.18 no.9
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• pp.29-35
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• 2019

The structure of the machinery industry due to the 4th industrial revolution is changing from precision and durability to intelligent and smart machinery through sensing and interconnection(IoT). There is a growing need for research on prognostics and health management(PHM) that can prevent abnormalities in processing machines and accurately predict and diagnose conditions. PHM is a technology that monitors the condition of a mechanical system, diagnoses signs of failure, and predicts the remaining life of the object. In this study, the vibration generated during machining is measured and a classification algorithm for normal and fault signals is developed. Arbitrary fault signal is collected by changing the conditions of un stable supply cutting oil and fixing jig. The signal processing is performed to apply the measured signal to the learning model. The sampling rate is changed for high speed operation and performed machine learning using raw signal without FFT. The fault classification algorithm for 1D convolution neural network composed of 2 convolution layers is developed.

• Journal of the Korea Society of Computer and Information
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• v.15 no.9
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• pp.165-172
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• 2010

Communication problems have been regarded as one of the biggest causes in trouble in many industries. This led to extensive research on communication as a part of human error analysis. The results of existing researches have revealed that maintaining a good quality of communication is essential to secure the safety of a large and complex process system. In this paper, we suggested a method to measure the quality of communication during off-normal situation in main control room of nuclear power plants. It evaluates the cosine similarity that is a measure of sentence similarity between two operators by finding the cosine of the angle between them. To check the applicability of the method to evaluate communication quality, we compared the result of communication quality analysis with the result of operation performance that was performed by operators under simulated environment.

• Journal of Korean Medicine for Obesity Research
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• v.17 no.2
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• pp.111-118
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• 2017

Objectives: This study was conducted to evaluate the effects of Pueraria lobata (PL) extract on obesity related hormones in rats with estrogen deficiency. Methods: The experiments were performed with the use of ovariectomized rats as estrogen-deficient obesity rat model. They were grouped Normal (sham operation group), Control (ovariectomy group), 50 mg/kg PL (ovariectomy group＋50 mg/kg of PL), 100 mg/kg PL (ovariectomy group＋100 mg/kg of PL), 200 mg/kg PL (ovariectomy group＋200 mg/kg of PL). PL extract was orally administered for 8 weeks once a day. Body weights and serum levels of hormones, such as leptin, estradiol, cholecystokinin (CCK), ghrelin, and adiponectin were estimated by ELISA. Results: PL extract significantly decreased body weight, the serum levels of leptin in estrogen-deficient obesity rats. PL extract significantly increased the serum levels of estradiol and CCK. However, PL extract did not directly effect on the levels of ghrelin and adiponectin in estrogen-deficient obesity rats. Conclusions: It is concluded that PL extract reduced body weight, and regulate the hormones related to energy metabolism. PL extract decreased the serum levels of leptin. PL extract increased the serum levels of estradiol and CCK. These results indicate that PL might have potentials for treatment of obesity and complications during the menopause caused by estrogen-deficiency.

• Nuclear Engineering and Technology
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• v.22 no.1
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• pp.66-74
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• 1990

The thermal-hydraulic characteristics of the 17$\times$17 OFA (Optimized Fuel Assembly) used in the KNU 7&8 are analyzed and compared with that of the 17$\times$17 SFA (Standard Fuel Assembly) loaded in the KNU 5&6. The thermal-hydraulic characteristics analyzed are minimum DNBR, fuel centerline temperature and exit void fraction at normal operation and design over power transient. Additionally, local linear rod power, which will cause fuel centerline melting, is calculated. The DNBR sensitivity calculations are performed with respect to the reactor operating parameters. COBRA-IV-I code is used for these calculations. The modified W-3 correltion and the drift-flux model are applied for the critical heat flux calculation and the void fraction calculation, respectively. From the calculated results, it has been found that the possibility of DNB occurrence is higher in the OFA than in the SFA. The other hand, the local linear power resulting in fuel centerline moiling of the OFA is nearly equal to that of the SFA.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.41 no.5
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• pp.493-504
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• 2021

The target site, Goejeongcheon flows through downtown of Saha-gu, Busan and it connects to the Nakdong-gang estuary. But non-point pollutants and sewage sludge are partially flowing into the stream and deposited. As a result, dissolved oxygen concentrations of the stream were observed close to the anaerobic condition. Multistage Vortex Aerator was applied for restoring this urban stream. It dissolves oxygen by repeatedly causing collisions between water and oxygen by vortex flow. The changes in water quality and odor were monitored for 2 months while circulating 1 m³/min of water with 22 ppm dissolved oxygen. As a result of the operation, the dissolved oxygen was improved from slightly Bad (4)~Bad (5) to Good (1b)~Normal (3) grade, and the total phosphorus concentration was decreased by 76 % on average. In the case of complex odor, a maximum reduction of 84.5 % was observed on the day the entire river was anaerobic. Through this study, we evaluated the feasibility of applying pure oxygen and Vortex Aerator for the the stream restoration. It is expected that the results of this study can be used for full-scale design.

• The Journal of Industrial Distribution & Business
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• v.12 no.11
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• pp.33-50
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• 2021

Purpose: In South Korea, two kinds of mandatory insurance, Fierce Liability Insurance and Outdoor Advertising Liability Insurance sells as of February 2021 according to relevant codes. This study analyzed third party liability and personal living liability insurance in terms of various risks not corporation side but personal side arising from normal living and life. Research design, data and methodology: Some cases of drone accident hit man and fierce dog accident were taken into analysis to verify blame ratio and insurance claim money. The former case is that on the way down the elevator, the dog, American pit bull terrier rushed in and bit the lower part of the knee against the visitor. The latter case is that while flying in the sky as usual, the drone suddenly crashed, fell, and hit the head of a young child while walking on the street. Further previous studies such as third party liabilities, liability insurance, mandatory insurance were deeply analyzed. Results: Based on some case studies and previous studies, the author suggested valuable comments in turn realization of insurer as provider, exhaustive creation and operation of mandatory insurance, realization of insured as demanded, and arrangements of laws and systems in special consideration of amendment of companion animal and exhaustive execution of mandatory insurance by the government. Conclusions: This study was about third party liability, personal living liability insurance and expansion of mandatory insurance caused by relevant laws by the government. In this study the author verified what issues were observed from two cases drone accident and fierce dog accident and then suggested some valuable comment as above both systemic plans and practical plans. First of all, the individual should get Comprehensive Property Insurance(CPI) that covers the risks of his/her own property arising from the everyday life. And then the individual should further buy Personal Living Liability Insurance(PLLI) in order to prepare 'accidents that may happen when, where, or how' and overcome the said accidents. Moreover, the individual should take a look every single insurance contract whether he/she has a special terms and conditions of Personal Living Liability Insurance(PLLI) or not.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.29 no.2
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• pp.401-415
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• 2019

Recently, there has been a lot of studies and efforts to strengthen the stability of critical infrastructures against increasing cyber attacks to critical infrastructures. In this thesis, I defined what cyber threats are, after showing you various definitions about what cyber threats are and what the types are. After studying about significant cyber threats from China, I showed you the realities of cyber threats with the analysis about starting points, types of cyber threats, ratios of attacks and so on. At last, I defined guidelines about unnecessary oversea IP range blocking. Also, I proposed unnecessary oversea IP range blocking methodologies with per information system and per network system. Furthermore, I proposed blocking characteristics per security equipment and security operation improvement and blocking effects and service process to normal oversea users.

• The Journal of the Korea institute of electronic communication sciences
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• v.14 no.1
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• pp.161-168
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• 2019

Recently, the development and dissemination of electric vehicles is increasing as a solution for carbon and emission reduction. In Korea, the supply of electric vehicles and the expansion of chargers are increasing rapidly every year under the supervision of the Ministry of Environment. In this paper, we study the portable smart test technology which enables quick check of charge related to faults in both electric car and charger to solve the problem of failure which is inevitable in the diffusion of electric car charger. To verify the normal operation of the communication protocol between the electric car and the charger, a hardware module and software were constructed, and a portable tester based on the international standard considering the V2G technology was developed and evaluated.

• Archives of Hand and Microsurgery
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• v.23 no.4
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• pp.290-295
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• 2018

Author planed peroneal artery perforator flap for ankle reconstruction and experienced successful result using sural neuro-lesser saphenous venous flap due to an unexpected event. A male Asian patient, 24 years old, had a history of recurrent operation wound disruption in the ankle region. Under general anesthesia, peroneal perforator and saphenous vein, as well as the sural nerve branches, were identified and preserved. In the process of flap rotation, an accidental division of peroneal artery perforator has occurred. Despite the division of the perforator, circulation was normal. The patient experienced no complication after the surgery. Some study reported that accompanying arteries and the vascular plexus around the sural nerve communicate. In conclusion, sufficient blood supply was possible only with the accompanying artery of the sural nerve without peroneal perforator. So, it is essential to always preserve not only perforator but also neurovascular bundles at any circumstances and any location.