• Journal of Convergence for Information Technology
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• v.10 no.8
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• pp.15-22
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• 2020

The 4th industrial revolution and the rapid change in the data environment revealed technical limitations in the existing relational database(RDB). As a new analysis method for unstructured data in all fields such as IDC/finance/insurance, interest in graph database(GDB) technology is increasing. The graph database is an efficient technique for expressing interlocked data and analyzing associations in a wide range of networks. This study extended the existing RDB to the GDB model and applied machine learning algorithms (pattern recognition, clustering, path distance, core extraction) to detect new abnormal signs. As a result of the performance analysis, it was confirmed that the performance of abnormal behavior(about 180 times or more) was greatly improved, and that it was possible to extract an abnormal symptom pattern after 5 steps that could not be analyzed by RDB.

• Journal of Internet of Things and Convergence
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• v.7 no.3
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• pp.69-74
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• 2021

With the recent development of biometric authentication technology, the user authentication techniques using biometric authentication are increasing. Various problems arised in certification techniques that use various existing methods such as ID/PW. Therefore, recently, a method of improving security by introducing biometric authentication as secondary authentication has been used. In this thesis, proposal of the user authentication system that can detect user identification and anomalies using ECGs that are extremely difficult to falsify through the electrical biometric signals from the heart among various biometric authentication devices is studied. The system detects user anomalies by comparing ECG data received from a wrist-mounted wearable device-type ECG measurement tool with identification and ECG data stored in blockchain form on the database and identifying the user's location through a beacon system.

• Journal of Advanced Navigation Technology
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• v.28 no.2
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• pp.185-192
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• 2024

The aviation has improved safety through technological innovation and strengthened flight safety through safety regulations and supervision by aviation authorities. As the industry's safety approach has evolved into a systematic approach to the aircraft system, airlines have established a safety management system. Technical defects or abnormal data in an aircraft can be warning signs that could lead to an accident, and the risk of an accident can be reduced by identifying and responding to these signs early. Therefore, management of abnormal warning signs is an essential element in promoting data-based decision-making and enhancing the operational efficiency and safety level of airlines. In this study, we present a model to statistically analyze quick access recorder (QAR) flight data in the preliminary analysis stage to analyze the patterns and causes of crab landing events that can lead to runway departures when landing an aircraft, and provide a precursor to a landing event. We aim to identify signs and causes and contribute to increasing the efficiency of safety management.

• Journal of Korean Biological Nursing Science
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• v.6 no.1
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• pp.5-15
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• 2004

목적 : 이 연구는 항암제를 투여받는 여성암환자에서 발반사마사지가 스트레스반응(활력징후, 코티졸)과 면역반응에 미치는 효과를 평가하기 위함이다. 방법 : 11명의 여성암 환자를 임의로 표출한 후 단일군 전후실험설계로 진행하였다. 종속변수는 스트레스 반응으로 활력징후(수축기 혈압, 이완기 혈압, 맥박수, 호흡수)와 혈중 코티졸, 면역반응으로 림프구 아군(CD3, CD4, CD8, CD19)과 자연살세포(NK cells)이며, 독립변수는 발반사마사지이었다. 중재 전후 종속변수의 변화를 보기 위해 Wilcoxon signed rank test를 실시하였다. 결과 : 중재 전에 비해 중재 후 수축기 혈압, 이완기 혈압, 맥박수, 혈중 코티졸치, CD4와 CD19는 유의한 변화를 보였으나 호흡수, CD3, CD8, 그리고 자연살세포는 유의한 변화를 보이지 않았다. 결론 : 이러한 연구결과는 발반사마사지가 항암화학요법을 받는 여성암 환자의 스트레스 호르몬과 면역관련세포에 영향을 보였지만 표본수가 작고 중재가 1회에 그쳤기 때문에 이러한 단점을 보완한 추후연구를 통해 발반사마사지의 효과를 좀더 잘 규명할 수 있을 것이다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.1
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• pp.109-115
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• 2009

This paper describes an early detection for indication of electric accident using current waveform which is measured in electric equipments consisted incandescent lamps. At first, it analyzes characteristics of current monitor in resistive electric circuit. In second, the electric equipment is consisted of incandescent lamps. And the electric accident is simulation of tracking according to KS C IEC(Korea Standard C International Electrostatic Commission) 60112 at some part of the electric equipment. The indication of the electrical accident is detected to analyzing current waveform measured by current monitor. As the tracking breakdown, electric accident, processes, as current pulse is bigger and ratio of appearance also is increased irrespective of amount of load.

• Journal of Korean Orthopaedic Sports Medicine
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• v.2 no.1
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• pp.71-76
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• 2003

We evaluated biceps pulley as a stabilizing sling for the long head of biceps tendon in the rotator interval. We present 3 cases of detached biceps pulley which impinges on posterosuperior glenoid labrum in the position of late cocking. Pulley impingement related to anterior shoulder instability was relieved after Bankart repair. In another two cases, impingement symptoms were disappeared after resection of the detached biceps pulley.

• Journal of the Korean Arthroscopy Society
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• v.7 no.2
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• pp.215-219
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• 2003

Purpose : To report the 'condylar cut-off sign', a new radiographic sign in knees with discoid lateral meniscus and to report the sensitivity, specificity, positive predictive value and negative predictive value of the sign to elucidate the diagnostic significance of the sign for discoid meniscus. Materials and Methods : Fifty knees with complete discoid lateral meniscus and fifty normal knees formed the basis of this study. All of them were arthroscopically confirmed fer the discoid or normal lateral meniscus. The authors developed a method to measure the length of the medial and lateral condylar were compare and analyzed. Results : Tile average ratio was 0.716 in the discoid meniscus group, and 0.902 in the normal group. The stastistical analysis by the T-test revealed the t-value -11.13(p<0.0001). Stastistical analysis by chi-square test using cut point 0.8, also showed significant difference between the two groups, with $76\%$ sensitivity, $100\%$ specificity, $100\%$ positive predictive predictive value and $81\%$ negative predictive value. The 'condylar cut-off sign' was readily detectable in all cases of discoid lateral meniscus, suggesting that the cut off sign could serve as a simple and reliable radiographic sign fur the diagnosis of discoid meniscus. Conclusion : The condylar cut-off sign on the Tunnel view of simple radiography of the knee can serve as a good sign for the diagnosis of discoid lateral meniscus, with $100\%$ positive predictive value.

• Journal of Chest Surgery
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• v.29 no.11
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• pp.1197-1201
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• 1996

From October, 1987 to December, 1995, nine patients underwent total correction of tetralogy of Fallot in adults over 20 years of age. There were 5 male and 4 female patients aged from 22 to 42 years(mean, 29.6 years). Three patients were in New York Heart Association(NYHA) functional class II, and 6 patients in class III. The hemoglobin values ranged from 10.8 to 20.7 gm/㎗ (average, l5.6gm/㎗). The preoperative clinical features were as follows: cyanosis, 8 patients; dyspnea on exertion, 6 patients; clubbing of fingers, 5 patients; frequent upper respiratory infection, 3 patients. At the operation both infundibular and valvular stenosis were present in all patients. Reconstruction of right ventricular outflow tract(RVOT) using Goretex was required in 7 patients, and transannular patching with Goretex in 2 pateints. Left pulmonary angioplasty with pericardium was done in 2 patients. No hospital deaths occurred. Four of 9 patients(44.4%) had postoperative low cardiac output syndrome, and postoperative bleeding in 5. One patient required reoperation due to residual ventricular septal defect and tricuspid regurgitation 3 months after the first operation. The mean follow-up period was 25 months, range 11 to 77 months. All was asymptomatic and in NYHA class I. We suggest that advanced age is not contraindication to surgery in tetralogy of Fallot, and tetralogy of Fallot in adults could be operated on due to low mortality.

• Journal of Internet Computing and Services
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• v.23 no.6
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• pp.39-48
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• 2022

Cyberattacks around the world continue to increase, and their damage extends beyond government facilities and affects civilians. These issues emphasized the importance of developing a system that can identify and detect cyber anomalies early. As above, in order to effectively identify cyber anomalies, several studies have been conducted to learn BGP (Border Gateway Protocol) data through a machine learning model and identify them as anomalies. However, BGP data is unbalanced data in which abnormal data is less than normal data. This causes the model to have a learning biased result, reducing the reliability of the result. In addition, there is a limit in that security personnel cannot recognize the cyber situation as a typical result of machine learning in an actual cyber situation. Therefore, in this paper, we investigate BGP (Border Gateway Protocol) that keeps network records around the world and solve the problem of unbalanced data by using SMOTE. After that, assuming a cyber range situation, an autoencoder classifies cyber anomalies and visualizes the classified data. By learning the pattern of normal data, the performance of classifying abnormal data with 92.4% accuracy was derived, and the auxiliary index also showed 90% performance, ensuring reliability of the results. In addition, it is expected to be able to effectively defend against cyber attacks because it is possible to effectively recognize the situation by visualizing the congested cyber space.

• Korean Journal of Biological Psychiatry
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• v.15 no.2
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• pp.83-91
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• 2008

Objectives : Neurological soft signs have been regarded as endophenotypes associated with the genetic basis of schizophrenia. This study was to investigate the intra-familial correlations of the neurological soft signs according to their genetic loading. Methods : Schizophrenic patients(N=14) were included, who had one parent with a family history of schizophrenia and the other without it. Genetic loading was determined by the patient's family history of schizophrenia using the Family Interview for Genetic Studies(FIGS). These parents were subdivided into two groups. The first group was designated as 'presumed carriers'(N=9) of genetic loading, who had one or more schizophreic firstor second-degree relatives. The second group was designated as 'presumed non-carriers'(N=11) of genetic loading, who had no schizophrenic first- or second-degree relatives. Normal controls(N=12) consisted of people without schizophrenic relatives. NSS were evaluated using the Neurological Evaluation Scale-Korean Version (NES-K), and the intra-familial correlations of NSS were tested using the Intra-Class Coefficients(ICC) method. Results : The scores of Motor Coordination subdimension of NES-K were significantly correlated between the patients and their presumed carriers(ICC=.804, p=.016), but not significantly correlated between the patients and their presumed noncarriers. In other subdimensions of NES-K, no significant correlation were found between the patients and their parents regardless of the genetic loading. But, there were no statistically significant differences in the scores of Motor Coordination subdimension of NES-K between the patients and controls. Conclusion : This study did not prove that the neurological soft signs might be an endophenotype of schizophrenia that cosegregate with the genetic loading. The future study using more subjects than this would be needed.