• Title/Summary/Keyword: 비행종단

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A Study on the Design and Implementation of a DSSS-based MODEM for a Right Termination System(FTS) (대역확산방식 비행종단시스템의 모뎀설계와 구현에 관한 연구)

  • Lim Keumsang;Kim Jaehwan;Cho Hyangduck;Kim Wooshik
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.2C
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    • pp.175-183
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    • 2006
  • This letter proposes a Direct Sequence Spread Spectrum (DS-SS)-based Flight Termination System(FTS) and show the simulation results and implements the system using FRGAs. The DS-SS FTS has immunity interference signals and the influence of jamming signal. Moreover, a DS-SS FTS can provides effects on an authentication and encryption with spread codes. And the system uses more less power than an analog FM system. We used Reed-Solomon (32, 28) code and triple Data Encryption Standard(3DES) for error correction and data encryption. Also we used counter algorithm for unauthenticated device's attack The spread codes of In-phase channel and Quadrature channel were generated by Gold sequence generators. The system was implemented in Altera APEX20K100E FPGA for the ground system and EPF10K100ARC240-3 for the airborne system.

Flight Safety Operation for the 1st Flight Test of Naro(KSLV-I) (나로호(KSLV-I) 1차 비행시험 비행안전 운영)

  • Ko, Jeong-Hwan;Choi, Kyu-Sung;Sim, Hyung-Seok;Roh, Woong-Rae;Park, Jeong-Joo;Cho, Gwang-Rae
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.38 no.3
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    • pp.280-287
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    • 2010
  • The first Korean satellite launch vehicle, KSLV-I(Korea Space Launch Vehicle-I), was launched for its first flight test on Aug. 25, 2009 from Naro Space Center located in south Jolla province. Because launch vehicles usually fly long range with large amount of propellants aboard, preparation of countermeasures against potential malfunctions during flight is essential in launch operation. In this paper, the flight safety operation, prepared to guarantee flight safety during launch operation of KSLV-I, is presented. Prior to flight test, flight safety analysis is performed to estimate associated risk levels quantitatively, and during flight, flight safety systems are operated to cope with any risky situations. Real-time flight monitoring including computation of instantaneous impact point using tracking data is executed normally and the flight test is completed without activation of flight termination system.

Influence of Protective and Risk Factors on Delinquent Behavior Trajectories (청소년 비행행동의 궤적에 영향을 미치는 보호요인과 위험요인)

  • Lee, Sang-gyun
    • Korean Journal of Social Welfare Studies
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    • no.39
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    • pp.315-342
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    • 2008
  • The aim of this study was to examine growth trajectories of delinquent behaviors during adolescence. In addition, the effects of protective and risk factors that might account for individual difference in the level of delinquent behaviors and in the rate of change were examined. Four waves of data in the Korea Youth Panel Survey(KYPS) were used to analyze the linear growth modeling. The sample consisted of 3346 adolescents who were assessed at 4 measurement waves with approximately 1-year intervals. The results showed significant individual differences in both final level of delinquent behaviors and in the rate of change across 3 measurement occasions. Adolescent gender, family's socioeconomic background predicted the final level and the rate of change of delinquent behaviors. The protective effects of positive parenting and self-control were significantly associated with problem behaviors and the risk effects of the association with deviant peers and negative stigma were significant on the final level of delinquency. Self-control and deviant peer affiliation had differential influences over time significantly. Practice and policy implications as well as further research topic were discussed in the light of searching for important factors in preventing adolescent problem behaviors.

The Flight Test of the KSLV-I Electronic Systems Using a Light Airplane (경항공기를 이용한 KSLV-I 전자탑재장비 비행시험)

  • Ji, Ki-Man;Lee, Soo-Jin;Chung, Eui-Seung
    • Aerospace Engineering and Technology
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    • v.7 no.1
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    • pp.142-150
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    • 2008
  • In order to ensure the individual and mutual performances among the telemetry system, tracking system, flight termination system, GPS, and inertial navigation & guidance system which are installed in the KSLV-I 2nd stage and ground equipment of the Naro space center, flight test using a light airplane is required. Since the high degree of test efficiency is fulfilled through the minute plan and analysis about selection of the equipment which are applicable to the test, harness, operation strategy, and antenna installation. KSLV-I communication environment and flight profile should be precisely taken into account during the flight test. In this document, overall aspect of the KSLV-I 2nd stage equipment specification, a rack for the installation, harness, the airplane specification, and flight route which are required for the effective flight test are presented.

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Range Safety System Operation in KSR-III Flight Test (KSR-III 비행안전 시스템 운영)

  • Ko, Jeong-Hwan;Kim, Jeong-Rae;Park, Jeong-Joo;Bang, Hee-Jin;Choi, Dong-Min;Song, Sang-Sup
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.32 no.7
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    • pp.91-97
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    • 2004
  • The first Korean liquid propellant rocket KSR-III successfully finished its flight test on Nov. 28, 2002. Herein, we summarize the results of range safety system operation which is employed for the first time in flight tests of rockets developed by Korea Aerospace Research Institute(KARI). During the flight, safety-critical flight data including instantaneous impact points are monitored in realtime by range safety officers utilizing Range Safety Display Systems. The recorded screen of the display system is presented for the explanation of safety operation. In addition, comparisons are made between onboard navigation system based and radar based results in calculating instantaneous impact points, and also errors from the finally recorded impact point are described.

Moderating Effects of Protective Factors on the Relation between Deviant Peer's Influences and Delinquency in Adolescence (청소년기 비행친구의 영향에 대한 보호요인의 조절효과 - 자아존중감, 부모애착 및 지도감독을 중심으로 -)

  • Park, Hyunsun;Lee, Sang-gyun
    • Korean Journal of Social Welfare Studies
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    • no.37
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    • pp.399-427
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    • 2008
  • The purpose of this study is to examine the moderating effects of protective factors on the relations between deviant peer's influences and delinquent behaviors in adolescence. To investigate the moderating effects, simple slope and region of significance test based on multiple linear regression(MLR) model were used. This study used data from wave 1-2(2003-2004) of the Korea Youth Panel Survey(KYPS). Results showed that for female adolescents, self-esteem, parent monitoring, and attachment to parent moderated the link between best friend's deviancy and delinquent behaviors. For male adolescents, however, best friend's deviancy and protective factors didn't show any significant moderating effects. These results help clarify the conditions under which exposure to deviant best friends can influence delinquent behaviors in adolescence. Practice and policy implications as well as further research topic were discussed to aid the search for highly effective preventive and treatment interventions.

A Study on Relationship between Media Environment and Adolescent Cyber-Delinquency : Focused on X-rated Media Commitment (매체환경과 청소년 사이버비행과의 관계에 대한 연구 : 성인매체몰입을 중심으로)

  • Lee, Chang-Moon;Moon, Jin-Young;Park, Ju-Won
    • Journal of Digital Convergence
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    • v.17 no.4
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    • pp.365-379
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    • 2019
  • The purpose of this study is to investigate what factors affect cyber-delinquency after examining the previous research focusing on the general strain theory and the delinquency opportunity theory in the existing studies. And as adolescents move from middle school to high school, this study is intended to analyze what factors affect cyber-delinquency from a longitudinal perspective using KCYPS(Korea Child and Youth Panel Survey) elementary 4th grade fourth and seventh data. The adolescence cyber-delinquency probability of occurrence were analyzed through the panel logit fixed-effect model using STATA. And then the cyber-delinquency frequency of adolescents were analyzed through the panel tobit random-effect model. As a result of analyzing the factors affecting cyber-delinquency frequency, Adult media commitment, computer use time, and cell phone dependency increased cyber-delinquency frequency. On the other hand, among the parenting attitudes, the attitude of supervising attentively and adolescents' age-increasing decreased cyber-delinquency frequency.

시간영역 유한차분법을 이용한 안테나 간섭영향 해석

  • Ji, Gi-Man;Kim, Gwang-Su;Hwang, Seung-Hyeon;Seo, Jin-Ho;Lee, Su-Jin
    • Bulletin of the Korean Space Science Society
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    • 2009.10a
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    • pp.49.2-49.2
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    • 2009
  • 소형우주발사체 KSLV-I의 상단부 전자장비 탑재 구조체의 외부면에는 텔레메트리, 원격추적, GPS, 비행종단 시스템의 안테나가 두 개 또는 세 개씩 장착된다. 발사체의 표면에 안테나를 부착할 수 있는 위치는 제한되어 있기 때문에 각 안테나 들은 서로 인접되어 부착된다. 또한 상단부 전자장비들과 지상장비의 성능을 검증하기 위해 수행되는 경비행기를 이용한 비행시험은 각 안테나들이 더욱 근접하여 장착된 상태로 수행된다. 따라서 각 하부시스템의 안테나 사이에 발생하는 간섭현상을 분석하기 위한 연구가 요구된다. 이 논문에서는 시간영역 유한차분법을 이용하여 서로 다른 하부시스템의 안테나 간에 발생하는 간섭영향을 해석하였다. 수행된 해석 과정은 우주발사체의 안테나 방사패턴을 해석하는데 이용될 수 있으며, 향후 우주발사체의 시스템 설계 과정에서 안테나의 배치 방법과 각 하부시스템의 성능 요구조건을 결정하는데 효과적으로 사용될 수 있다.

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A Study on the Telemetering Results of KSR-III Flight Test (KSR-3 비행시험 원격측정시스템 운용 결과)

  • Lee, Sang-Rae;Lee, Soo-Jin;Kim, Sung-Wan;Lee, Jae-Deuk
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.31 no.6
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    • pp.96-101
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    • 2003
  • Korea Sounding Rocket(KSR)-III onboard telemetry system has acquired various data from subsystems and sensors in the rocket, and radiated PCM/FM data using two S-band antennas during the flight. Simultaneously, it is necessary that the ground receiving systems track the rocket, and receive and decode telemetry data. Also post processed telemetry data are needed to be broadcasted on ethernet network in real time. Range safety display system displays flight trajectory using telemetry data in mission control center, and so flight manager makes a decision for flight termination from the trajectory This paper describes operating technique about telemetry reception, the development for the realtime data processing system, and the results for telemetering reception on fight test. We telemetered, processed, and broadcasted numerous telemetry data during the flight test successfully.

Estimating Adolescent's Changes in Overt Aggression : Tests of Effects of Ecological Factors on Individual Differences in the Changes (다층모형을 적용한 청소년의 외현적 공격성 변화 추정 : 변화에 있어서의 개인차에 대한 생태학적 요인 검증)

  • Kim, Dong-Ki;Hong, Se-Hee
    • Survey Research
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    • v.8 no.2
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    • pp.21-42
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    • 2007
  • In the present study, we studied the change patterns of adolescents' overt aggression during the middle school 2nd to the high school 1st grades and the effects of ecological factors on the change. For the research goals, we applied multi-level models to the Korean Youth Panel data. Results showed that adolescents' overt aggression decreased significantly during the period. Gender(males recoded as 1) and self-control had negative effects on the initial status(middle school 2nd grade) while the number of delinquency peers had a positive effect. On the other hand, gender and self-control showed positive effects on the change rate. The major strengths of the research are the study of various ecological factors and the longitudinal design. Few studies of adolescents' aggression have incorporated these methodological and substantive characteristics.

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