윈도우 기반 PLC구동 프로그램 개발

김태형,정원지,엄태진,홍대선 國立 昌原大學校 産業技術硏究所 2000 産技硏論文集 Vol.14 No.-

As personal computers are being developed, most softwares are based on window-based operating systems recently. The programmable logic controllers (PLC's) which are usually operated based on the DOS system should be adapted to the window-based environment in order to have the multi-tasking and flexibility of PLC programs. In this paper, the PLC driving programs which are based on the window-based operating systems are developed for the hardwares in which only DOS-based driving programs are being used currently.

고속·고정밀 금형가공센터 개발 Ⅲ

최원선,이창호,박보선,김태형 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-

In order to manufacture a precision mold/die by machining, users need high speed & precision mold/die machining center. So, for development of this machine, we intend to use linear motor that is instead of ball-screw, servo-motor and coupling, high-speed spindle of pressurized air journal bearing and composite materials. In this paper we research column moving type and table moving type. The former is mainly piling 3 axes on one moving body, the latter is consist of two independent carriages. Both types are available to high speed & precision machine, but we finally draw a conclusion column moving type due to an advantage of high-speed control of linear motor.

TINA 기반의 인터넷 멀티미디어 서비스 구조 설계

권태형,이상백,박동선,이경휴 한국정보전략학회 1999 추계공동학술대회 논문집 Vol.- No.01

본 논문에서는 TINA 기반의 인터넷 멀티미디어 서비스 구조를 설계하였다. 설계한 구조는 PSTN을 사용하여 인터넷에서 멀티미디어 서비스를 위한 Qos를 보장할 수 있도록 하였다. 본 논문에서 제시한 구조에서는 TINA 비즈니스 모델을 이용하여 사용자는 손쉽게 다양한 멀티미디어 서비스를 이용할 수 있도록 하고, 서비스 제공자는 서비스 제공이 손쉬우며 망 사업자 측면에서는 서비스 활성화에 따른 망 사용 증가로 인해 망 수요를 증가 시킬 수 있도록 하였다.

부분적으로 유체가 채워진 원통형 관내의 외팔보 진동특성에 관한 실험적 연구

권대규,유계형,소순선,이성철 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2003 工學硏究 Vol.34 No.-

This paper presents the vibration characteristics of an intelligent cantilever beam in contact with fluid using PZT actuator and PVDF film. The effect of liquid level on free vibration of composite beam in a partially liquid-filled circular cylinder is investigated. The dynamic behaviors of a flexible beam-water interaction system are examined. The coupled system is subject to an undisturbed boundary condition in the fluid domain. In the vibration analysis of wetted beam, the decoupled analyses between beam and fluid have been conventionally employed by considering firstly the composite beam vibration in air and secondly performing the correction taking account for surrounding fluid effects. That is, this investigation was to look at how natural frequencies, mode shapes, and damping are affected by liquid level variations. Using the coupled modal reanalysis method employing the governing equations and the clamped-free and free-free boundary conditions, the vibration analysis of beam in contact with fluid is performed. We also carried out the experimental verification about reliability of theoretical methods to inclusive vibration analysis of the fluid-structure system with PZT actuator and PVDF film. It was found that the coupled natural frequencies decrease with the fluid level for the identical composite beam due to added mass effect.

고속·고정밀 금형가공센터 개발

최원선,김태형,이재윤 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-

In order to manufacture a precision mold/die by machining, users need high speed & precision mold/die machining center. So, for development of this machine, we intend to use linear motor that is instead of ball-screw, servo-motor and coupling, high-speed spindle of pressurized air journal bearing and composite materials. In this paper we research column moving type and table moving type. The former is mainly piling 3 axes on one moving body, the latter is consist of two independent carriages. Both types are available to high speed & precision machine, but we finally draw a conclusion column moving type due to an advantage of high-speed control of linear motor.

일 도시 지역의 외상후 스트레스 장애 역학 조사

은헌정,이선미,김태형 大韓神經精神醫學會 2001 신경정신의학 Vol.40 No.4

연구목적 : 이 연구는 DSM-IV에 근거한 외상후 스트레스 장애(Posttrauamatic Stress disorder : 이하PTSD)의 평생 유병률 및 현재 유병률을 평가하고, PTSD와 관련된 외상 사건의 유형과 사회인구학적 특성을 조사하고 한다. 방 법 : 조사를 위해, 전체 인구가 611,921명인 한 도시가 선택되었고, 도시 내 15세에서 65세 이상인 850명을 표집하여, 가정 방문을 통해 외상사건 조사표와 임상가 실시용PTSD척도(CAPS)를 적용하여 실시하였다. 결 과 : 연구 지역내에서 PTSD의 평생 유병률은 4.71%, 현재 유병률은 2.12%이었다. 평생 및 현재 유병률에서 남녀간에 통계적으로 유의한 차이가 없었다. (p>.05). 또한 나이, 교육에 따른 평생 유병률도 통계적으로 유의한 차이가 없었다.(p<.001). 단지 결혼 상태에 따른 평생 유병률에서 통계적으로 유의한 차이가 있었다. 외상사건에 평생 동안 노출될 확률은 78.79%이었다. 갑작스럽고 예기치 않았던 친지의 죽음이 가장 흔히 발생하는 사건이었다(51.06%). 자연재해, 화재 및 폭발, 교통사고, 가정 및 직장에서의 심각한 사고, 신체적폭력, 무기로 공격함, 전쟁, 생명을 위협하는 질병, 누군가를 심하게 다치게 하거나 죽음에 이르도록 함과 같은 사건은 남성에서 여성들보다 더 자주 발생하였고, 여성들에게는 성폭행이 더 자주 발생하였다. PTSD발병과 상관이 높은 외상사건은 자연재해, 화재 및 폭발, 교통사고, 가정 및 직장에서의 심각한 사고, 신체적 폭력, 성폭행, 생명을 위협하는 질병 등 이었다. 결 론 : 조사 지역 내에서 PTSD의 유병율은 다른 대부분의 선행 연구들에 비해 낮았다. 본 연구에서는 성별에 따라 흔히 경험한 외상사건의 유형에 차이가 있으며, PTSD와 관련된 외상사건들도 차이가 있음을 발견했다. 앞으로 역학 연구에서 외상 사건들로부터 PTSD를 일으킬 확률을 알기 위해서는 회고적으로 보고한 제한된 소수의 외상사건들을 조사하기 보다는 평생 경험하는 모든 외상사건들을 평가해야 할 것이며, 전국전인 표집을 해야 할 필요가 있을 것으로 생각된다. Objectives : This study was designed to assess the epidemiology of DSM-IV posttraumatic stress disorder(PTSD), including information on lifetime and current prevalence, the kinds of traumas most often associated with PTSD, and sociodemographic correlates. Method : For this survey, an urban area with total population of 611,921 persons was chosen. Modified version of traumatic event checklist and Clinician Administered PTSD Scale were administrated to a representative sample of 850 persons aged 15 o 65 years above through home visiting. Results : The lifetime and current prevalence of PTSD in survey area was 4.71% and 2.12%. the lifetime and current prevalence in male and female were of no significant statistical differences(p>.05). And the lifetime prevalence by age, and education were of no significant statistical differences. Only the lifetime prevalence by marital status was of significant statistical differences(p<.001). The lifetime prevalence to any traumatic exposure was 78.79%. Sudden unexpected death of a close person was the most prevalent traumatic event(51.06%). Among the traumas, natural disaster, fire and explosion, motor vehicle accident, serious accident at work or home, physical assault, assault with a weapon, combat, life-threatening illness, and serious injury to death you caused to someone else were more commonly associated with male sex, and sexual assault was more commonly associated with female sex. The traumas commonly associated with PTSD were natural disaster, fire and explosion, motor vehicle accident, serious accident at work or home, physical assault, sexual assault, combat, and life-threatening illness. Conclusion : The lifetime and current prevalence in survey area were lower than those of previous studies. This study found differences between men and women on the type of trauma experienced, and the type of trauma associated with PTSD. Future epidemiological studies to assess PTSD from all lifetime traumas rather than from only a small number of retrospectively reported ones will be required, and larger sample size covering the country will be required for better estimation.

한국판 사건충격척도 수정판의 신뢰도 및 타당도 연구

은헌정,권태완,이선미,김태형,최말례,조수진 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.3

Objectives : The present study was conducted to explore the reliability and validity of the "Impact of Event Scale-RevisedKorean version" (IES-R-K). Methods : The subjects were college students who visited a college counseling center and patients who were admitted to a general hospital and two orthopedic local clinics.Those subjects who experienced catastrophic traumatic events were tested for CAPS, BDI, STAI-I, II, and MMPI-PTSD scale. Results : The range of correlations between item-total were .45 -.89. The coefficients of internal consistency were .69 -.83, of them were the Split-half reliability was .71 and the test-retest reliability was .89, all within expected ranges. Inter-corre-lations of IES-R-K, CAPS, BDI, STAI-I, II, and MMPI-PTSD scale were high. CAPS showed the highest correlation Coef-ficient. Factor analysis indicated 4 factors in IES-R ; avoidance, hyperarousal, intrusion, and sleep problem & numbness. IES-R-K can be a useful self-rating diagnostic instrument for PTSD symptoms to be a clinical concern by using 24/25 cutoff in total score. The partial PTSD cutoff score is 17/18. Conclusion : The IES-R-K was confirmed in it's reliability and validity. IES-R-K could be applied for screening of PTSD.

프랙탈의 반복함수계를 이용한 웨이블릿 기반 워터마킹 기법 연구

장명환,황선태,이 형 대전대학교 산업기술연구소 2000 산업기술연구소 論文集 Vol.11 No.2

본 논문은 프랙탈의 반복함수계를 이용한 웨이블릿 기반의 워터마킹 기법을 제안한다. 제안한 방법에서는, 3-단계 웨이블릿 변환을 통하여 이미지를 주파수 대역으로 변환한다. 워터마크는 반복함수의 출력벡터의 수를 조절하여 생성한다. 견고성 향상을 위해 고주파수 대역뿐만 아니라, 저주파수 대역인 LL 대역에도 워터마크를 삽입한다. 또한, 워터마킹 영상의 화질저하를 줄이기 위해 웨이블릿 변환 단계마다 가중치를 다르게 부여한다. 실험결과, 기존의 Cox 방법과 비교할 때 잡음첨가, 부분 삭제 그리고 필터링등의 공격들에 대하여 화질과 견고성면에서 향상된 결과를 보였다. In this paper, the watermarking technique using the Iterated Function System based on wavelet transform is proposed. In this method, the image is chanced into coefficients of frequency domain by 3-level wavelet transform. We adjusted the number of Iterated Function Output Vectors and then generated watermarks. We intended to improve the robustness of the watermark by embedding the watermark not only into high-pass band(LH, HL, HH) but into low-pass band(LL). Also the scaling parameters are used differently in each wavelet transformation levels in order to reduce the distortion of watermarked image. The experimental results show that our proposed method has better image quality and robustness to the attacks of noise addition, cropping and filtering than those of existing Cox's method.

한국판 임상가용 아동 및 청소년을 위한 외상후 스트레스장애 척도의 신뢰도 및 타당도 연구

구정일,김태형,은헌정,최말례,이선미,조수진,송옥선,김형욱 大韓神經精神醫學會 2006 신경정신의학 Vol.45 No.6

Objectives : This present study was conducted to explore the reliability and the validity of Clinician Administered PTSD Scale for Children and Adolescents Korean version (CAPS-CA) Mcthods : The Subjects were children and adolescents (8-13yrs) from different places: a certain elementary school, three orphanages, a general hospital, and two neuropsychiathc local clinics. Only subjects who experienced a catastrophic traumatic event were tested by CAPS-CA, CDI, RCMAS, and TSC. Rcsults : The range of correlations between item-criterion were .67-.84. The coefficients of internal consistency were .87. and test-retest reliability was .90, were all the coefficients in the proper range. Inter-correlations of CAPS-CA, CDI, RCMAS, and TSC scale showed significant correlation. TSC showed the highest correlation coefficient. CAPS-CA can be a useful clinician-administered diagnostic instrument for children and adolescents PTSD symptoms. Conclusion : The reliability and the validity of CAPS-CA were confirmed. CAPS-CA could be applied for diagnostic purposes of PTSD in children and adolescents.

간질 환자의 인구학적 특성, 임상 특성, 정신병리 및 대처방식과 심리사회적 적응과의 관계

은헌정,최관호,이선미,김태형,최말례 대한간질학회 2004 대한간질학회지 Vol.8 No.1