• Journal of the Korean Society for Aviation and Aeronautics
• /
• v.20 no.3
• /
• pp.35-43
• /
• 2012

Medium size rotorcraft consist of approximately 5,000 key components. The components must satisfy the target weight and performance requirement through optimization. Therefore a rotorcraft component has approximately 100 times higher unit cost for mass production than the equivalent of an automobile's, along with huge development cost. Configuration management consists of four main parts : configuration identification, configuration control, configuration audit, and data management. In development programme, configuration management is one of the methods to save development cost, and setting a well-structured configuration management system according to the Military Standard is an important factor in success of the programme. The paper proposes a configuration management system suitable for development of various multi-use components development and presents that the configuration management was performed successfully during dual-use component development programme using the established system.

• 대한상한금궤의학회지
• /
• v.10 no.1
• /
• pp.69-80
• /
• 2018

Objective : Patients complaining of dizziness and olfactory hallucination who were diagnosed and treated with the Shanghanlun disease pattern identification diagnostic system were analyzed to report cases. Methods : This is a case report on a patient who has been suffering from Dizziness andolfactory hallucination. According to Diagnostic system based on Shanghanlun provisions, Gyeji-tang was provided. The severity of Dizziness was evaluated by NRS. Results : When analyzing the patient's history and symptoms, it can be found in article No. 42 in Shanghanlun. In the first case, NRS changed from 8 to 2. In the second case, NRS change 8 to 1. Conclusions : Gyeji-tang can be effective in dizziness and olfactory hallucination with the Shanghanlun disease pattern identification diagnostic system.

• Journal of Positioning, Navigation, and Timing
• /
• v.12 no.3
• /
• pp.257-269
• /
• 2023

This paper presents a method for detecting faults in data obtained from the Automatic Identification System (AIS) of surface vessels. The data include latitude, longitude, Speed Over Ground (SOG), and Course Over Ground (COG). We derive two methods that utilize two models: a constant state model and a derivative augmented model. The constant state model incorporates noise variables to account for state changes, while the derivative augmented model employs explicit variables such as first or second derivatives, to model dynamic changes in state. Generally, the derivative augmented model detects faults more promptly than the constant state model, although it is vulnerable to potentially overlooking faults. The effectiveness of this method is validated using AIS data collected at a harbor. The results demonstrate that the proposed approach can automatically detect faults in AIS data, thus offering partial assistance for enhancing navigation safety.

• Journal of the Korea Society of Computer and Information
• /
• v.19 no.7
• /
• pp.87-93
• /
• 2014

TIn analysis as the first step of S/W development, security requirements of identification and authentication, ID and password management, authentication process, authentication method, ete. should be defined. Identification is to uniquely identify certain users and applications running on a certain system. Authentication means the function to determine true or false users and applications in some cases. This paper is to suggest the security requirements for identification and authentication in analysis step. Firstly, individual ID should be uniquely identified. The second element is to apply the length limitations, combination and periodic changes of passwords. The third should require the more reinforced authentication methods besides ID and passwords and satisfy the defined security elements on authentication process. In this paper, the security requirements for the step of identification and authentication have been explained through several practical implementation methods.

• Journal of the Korea Convergence Society
• /
• v.8 no.4
• /
• pp.9-18
• /
• 2017

UAVs began to be actively applied to so-called 3D jobs, including the autonomous exploration, investigation, mapping, search and rescue, etc. since the mid-2000s. With this global trend, having a precise controllability of the UAV will certainly revolutionize the life of the modern human in the aspect of tremendous applications of the UAV. In the first part, a simplified dynamic model of the UAV identified using system identification techniques is compared with the previously built time-discrete linear model. In the second part, the three parameters of the dynamic model are estimated using the batch and RLS methods. Angular acceleration data of the quadrotor UAV at the hovering maneuver are analyzed and shown to be converging at all time. Also, according to the quadrotor flight data from both experiments and MATLAB simulations, the batch estimation method turns out to be more accurate than the RLS estimation method based on the comparison of final parameter values.

• KIPS Transactions on Software and Data Engineering
• /
• v.2 no.9
• /
• pp.603-614
• /
• 2013

The popularity of mobile devices provides their users with a circumstance that services and information can be accessed wherever and whenever users need. Accordingly, various studies have been proposed personalized methods to improve accessibility of mobile users to information. However, since these personalized methods require users' private information, they gives rise to problems on security. An efficient way to resolve security problems is to estimate user information by using their online and offline behavior. In this paper, for this purpose, it is proposed a novel user information identification system that identifies users' personal and social information by using both his/her behavior on social network services and proximity patterns obtained from GPS data. In the proposed system, personal information of a user like age, gender, and so on is estimated by analyzing SNS texts and POI (Point of Interest) patterns, while social information between a pair of users like family and friend is predicted with proximity patterns between the users. Each identification module is efficiently designed to handle the characteristics of user data like much noise in SNS texts and missing signals in GPS data. In experiments to evaluate the proposed system, our system shows its superiority against ordinary identification methods. This result means that the proposed system can efficiently reflect the characteristics of user data.

• Journal of Korean Society of Steel Construction
• /
• v.21 no.2
• /
• pp.165-173
• /
• 2009

Hanger cables in suspension bridges are constrained by the horizontal clamp. So, the accuracy of estimated tension of hange cable using existing methods based on the simple mathematical model of singel cable decreases as the length of cable decreases because of the flexural rigidity. Therefore, back analysis and system identification techniques based on the finite element model are proposed recently. In this paper, the applicability of the back analysis and system identification techniques are compared using the hanger cable of Gang-An Bridge. The experimental results show that the back analysis and system identification techniques are more reliable than the existing string theory and linear regression method in the view point of the error of natural frequencies. However, the estimation error of tension can be varied according to the accuracy of finite element model in the model based methods. Especially, the boundary condition is more affective when the length of cable is short, so it is important to identify the boundary condition through experiment if it is possible. The tension estimation method using system identification technique is more attractive because it can easily consider the boundary condition and it is not sensitive to the number of input measured natural frequencies.

• 대한상한금궤의학회지
• /
• v.7 no.1
• /
• pp.29-43
• /
• 2015

Objective : The purpose of this paper is to report the improvement of 3 patients with uterine fibroid treated by herb medication based on Shanghanlun disease pattern identification diagnostic system. Methods : According to 'Disease Pattern Identification Diagnostic System based on Shanghanlun Provisions', they were diagnosed with Taeyang-byung, Yangmyung-byung. They took different herb medications more than 8 weeks according to their diagnosis. The size of uterine fibroid was estimated by ultrasonography. Results : The size of uterine fibroid reduced from 3.94cm to 2.55cm on first patient, 5.20cm to 4.86cm on second patient, 12.63cm to 7.77cm on third patient. Conclusions : Herb medication not only reduced the size of uterine fibroid but also improved symptoms such as dysmenorrhea, vaginal bleeding, pelvic discomfort, fatigue. In addition, this is the first case report treating the uterine fibroid with herb medication of shanghanlun in Korea.

• 대한상한금궤의학회지
• /
• v.8 no.1
• /
• pp.155-164
• /
• 2016

Objective : The purpose of this paper is to report the improvement of patient with panic disorder treated by herb medication based on Shanghanlun disease pattern identification diagnostic system. Methods :, The patient with panic disorder was diagnosed according to 'Disease Pattern Identification Diagnostic System based on Shanghanlun Provisions'. The changing symptom of panic disorder was estimated by BAI(Beck Anxiety Inventory). Results : The patient was diagnosed with yin-yang-yi-cha-hou-lao-fu bing, number 397 provision, and took Jukyeopseokgo-tang herb medication about 113 days. The BAI score changed 37 to 12. Conclusions : The therapeutic intervention and herb medication showed a therapeutical effect on the patient. The anxiety and helplessness of the patient was improved. This patient's panic disorder was associated with poor sleep patterns and sensitivity to minor things and controled by Jukyeopseokgo-tang. The relationships between poor sleep patterns and 陰陽易差後勞復病, shortness of breath when sensitive to minor things and 少氣 need further study.