• Journal of Institute of Control, Robotics and Systems
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• v.15 no.2
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• pp.240-248
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• 2009

Modem version of supersonic jet fighter aircraft must have been guaranteed appropriate controllability and stability in HAoA(High Angle of Attack). The HAoA flight control law have two parts, one is control law of departure prevention and the other is control law of departure recovery support. The control laws of departure prevention for advanced jet trainer consist of HAoA limiter, roll command limiter and rudder fader. The control laws of departure recovery support are consist of yaw-rate limiter and MPO(Manual Pitch Override) mode. The guideline of pitch rocking using MPO mode is simple, but operating skill of pitch rocking is very difficult by the pilot with inexperience of departure situation. Therefore, automatic deep stall recovery system is necessary. The system called the "Automatic Pitch Rocker System" or APRS, provided a pilot initiated automatic maneuver capable of an aircraft recoveries in situations of deep stall, speed and altitude. This paper addresses the design and validation for APRS to recovery of an deep stall without manual pitch rocking by the pilot. Also, this system is designed to recovery of speed, attitude and altitude after deep stall recovery using ATCS (Automatic Thrust Control System) and autopilot. Finally, this system is verified by real-time pilot evaluation using HQS (Handling Quality Simulator).

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.10
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• pp.60-67
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• 2005

Modern version of supersonic jet fighter aircraft must have guaranteed appropriate controllability and stability in HAoA(high angle of attack). Limit value of aircraft entering into the deep stall in HAoA is related to aircraft configuration design. But, In order to guarantee the aircraft's safety in HAoA, control law for HAoA region implemented in digital Fly-By-Wire flight control system of supersonic jet fighter. The AoA limiter is designed for positive HAoA in longitudinal control law. But, aircraft departure during aggressive negative pitch maneuver such as push over in departure resistance flight test. Therefore negative AoA limiter is needed in longitudinal control law. Result of T-50 flight test show that the AoA is exceed the limit value during aggressive positive pitch maneuver in pull up of power approach mode. In this paper, the AoA limit control law in positive and negative AoA was proposed in order to improve aircraft controllability and stability.

• (The) Research of the performance art and culture
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• no.38
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• pp.297-347
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• 2019

Jie Jie Hao Yin 『절절호음(節節好音)』 is a script collection produced during the Qianlong's ruling Period which had one of the most flourished period of Qing Dynasty's Palace Drama. This script collection is consisted of 86 scripts of 6 Festival Court Plays: New year's day (元旦), Lantern festival(上元), Yanjiu festival(燕九), Snow appreciation(賞雪), Day of Kitchen god worshipping(祀竈), New year's eve(除夕). These scripts are effective records to study the New Year's Eve Drama of Qianlong Period. Jie Jie Hao Yin carry out the performances not only through Kunqiang (崑腔), and Yiyang Tune (弋腔), but also through various types of entertaining performances such as dance, masque play, puppet show, and story telling. Most of the songs were sung by various gods praising the era of peace as the holiday approaches. In the contents of revealing the luck to be brought by the holidays, it sought for the colorful transformations of stages through adding humoristique short stories or various feast genres in between the performance. It also tries to seek for diversities of stages through active application of acrobatics. It also portrays folk customs from BaiYunGuan's temple fair, Yanjiu Festival in YanBin, the Lantern Fair of Lantern Festival, and various activities of wet markets from New Year's Eve from diverse points of views. Especially through various shows and Chinese folk-art forms, the popular folk activities and entertainments near Beijing in the beginning era of Qing Dynasty can be observed. Jie Jie Hao Yin is a very important resource to look at the popular art activities of Beijing during Qianlong Period, and how the Palace culture accepted the folk cultures and applied to its own advancements.

• 전기의세계
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• v.65 no.6
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• pp.12-18
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• 2016

• 한국생물공학회:학술대회논문집
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• 2002.04a
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• pp.57-57
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• 2002

• KOMUNHWA
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• no.14
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• pp.2-23
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• 1976

• 대한임상약리학회:학술대회논문집
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• 2002.12a
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• pp.29-29
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• 2002

• Journal of Electrical Engineering and Technology
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• v.11 no.6
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• pp.1802-1811
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• 2016

A novel battery SOH estimation algorithm based on outlier detection has been presented. The Battery state of health (SOH) is one of the most important parameters that describes the usability state of the power battery system. Firstly, a battery system model with lifetime fading characteristic was established, and the battery characteristic parameters were acquired from the lifetime fading process. Then, the outlier detection method based on angular distribution was used to identify the outliers among the battery behaviors. Lastly, the functional relationship between battery SOH and the outlier distribution was obtained by polynomial fitting method. The experimental results show that the algorithm can identify the outliers accurately, and the absolute error between the SOH estimation value and true value is less than 3%.

• Journal of Korea Multimedia Society
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• v.13 no.6
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• pp.865-874
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• 2010

Recently, Hao et al. proposed a privacy preservation protocol based on group signature scheme for secure vehicular communications to overcome a well-recognized problems of secure VANETs based on PKI. However, although efficient group signature schemes have been proposed in cryptographic literatures, group signature itself is still a rather much time consuming operation. In this paper, we propose a more efficient privacy preservation protocol than that of Hao et al. In order to design a more efficient anonymous authentication protocol, we consider a key-insulated signature scheme as our cryptographic building block. We demonstrate experimental results to confirm that the proposed protocol is more efficient than the previous scheme.

• Membrane and Water Treatment
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• v.5 no.1
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• pp.41-56
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• 2014

A series of microporous PVDF membranes were prepared by isothermal immersionprecipitation of PVDF/TEP casting dopes in both soft and harsh coagulation baths. Morphologies of the membranes' top surfaces were found to depend strongly on the bath strength, which could be controlled by the TEP content in the bath. By changing the bath gradually from pure water to 70% TEP, the top surface evolved from a dense skin-like (asymmetric) to a totally open porous morphology (symmetric). The latter structure could similarly be obtained by precipitation of the same dope in an alcoholic bath, e.g., 1-butanol. Membrane distillation processes to desalt sodium chloride aqueous solutions were conducted using various prepared membranes and two commercial microporous membranes, PTFE (Toyo, Japan, code: J020A330R) and PVDF (GE, USA, code: YMJWSP3001). The permeation fluxes were compared and correlated with the morphologies of the tested membranes.