• 영재교육연구
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• 제7권1호
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• pp.51-76
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• 1997

The purpose of this study was to investigate the effects of Structure of Intellect( SOI) program for children. To achieve this purpose, 81 second grade children were sampled in a elementary school located In Seoul-city and randomly assigned to the experimental group and control group The SO1 training program were treated to the experimental group for 10 weeks, and the 'Thinking Abilities Test developed by Korea Creativity Research Institute were administered to them for pre-test and post-test. The collected data were analyzed by t-test for comparing the group means of experimental group and control group 'I'he results of this study were as follows : Firstly ere were statistically significant differences between experimental group and control group on the post-test scores of arithmetic[t(79)=2.73p,< .01] and visual memory[t(79)-3.68,p <.001]. The mean scores of experimental group(M=8.63) u ere higher than that of control group(Mz7.34) on arithmetic, and the mean scores to experimental group(M=16.68) were higher than that of control group(M=15 32) on visual memory Secondly there were no statistically significant differences between experimental group and control group on the post-test scores of logistic thinking abilities[t(79)=0.22, p>.05] and abstract thinking abilities[t(79)-0.22, p>.051. Thirdly, the post-test scores of visual memory and logical thinking abilities were more increased in the low intelligence group than the high intelligence group. This result showed that the SO1 program were more effective for the low intelligence group. Fourthly, the post-test scores of visual memory and logical thinking abilities were more increased in the low achievement group than the high achievement group. This result showed that the SO1 program were more effective for the low achievement group.

• 한국항행학회논문지
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• 제25권5호
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• pp.377-383
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• 2021

본 논문에서는 항공기에 탑재되는 무장관리컴퓨터의 하드웨어 검증을 위한 자동시험 장비 개발 사례를 기술한다. 최근 항공기에 요구되는 기능이 다양해지고, 항공전자 장비의 관련 기술이 발전함에 따라 항공전자 장비에 필요한 인터페이스의 종류와 수량이 증가하였다. 무장관리컴퓨터 또한 기존 구형 무장 이외에도 신형 무장에 대한 요구사항이 추가됨에 따라 다량은 인터페이스 제어가 필요하다. 이와 같은 이유로 항공전자 장비의 점검에 투입되는 시간과 인력 소요 또한 증가하고 있으며, 항공전자 장비의 시험 과정을 자동화 및 무인화 할 수 있다면, 더 효율적인 점검 시스템 운용이 가능해질 것이다. 따라서 본 논문에서는 무장관리컴퓨터 하드웨어 기능 검증에 필요한 시험장비의 구조설계 내용과 검증 과정을 자동화하기 위한 시험 소프트웨어 및 시험 시나리오 설계 사례를 소개한다.

• 한국항행학회논문지
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• 제26권1호
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• pp.1-8
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• 2022

원격측정 시스템은 비행체의 상태 정보를 계측하여 지상으로 전송하는 시스템이다. 지상에서 수신한 데이터는 비행체의 상태를 모니터링하기 위한 정보로 점검 프로그램을 통해 실시간으로 점검 및 분석이 가능하다. 현재 운용중인 원격측정 자료처리 점검 시스템은 유선 통신을 이용하여 데이터를 전송하고 점검을 수행하도록 구축되어 있다. 계속되는 정보통신기술의 발전으로 스마트 기기가 대중화되면서 무선 통신 네트워크가 중요해지고 있으며, 성능 개선을 위한 기술 개발이 꾸준히 이루어지고 있다. 때문에 본 논문에서는 기존 방식을 탈피하고 미래지향적인 기술을 적용하기 위해 태블릿과 같은 스마트 기기를 통해 점검 가능한 무선 통신(Wi-Fi; Wireless fidelity) 기반의 원격측정 자료처리 지상 점검 시스템을 제안하고 구축하였다. 또한 점검 장비와 점검 프로그램을 연동하여 다양한 환경에서의 테스트를 통해 제안한 점검 시스템의 성능을 확인하였다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.112.1-112.1
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• 2010

To develop domestic IGCC gasification technology, a gasification test bed with a capacity of 20 tons/day has been designed. The main components of the test bed designed are a coal pulverizing and feeding facility, a gasifier, a syngas cooler, a gas treatment unit, oxygen and nitrogen tanks, and flare stack. For wide applications to the development of advanced coal gasification technology, many special functions have been given to it such as syngas recirculation, char recirculation, and multiple stage gasification. The test bed will be used for testing the characteristics of various types of coals, deriving optimum conditions for efficient gasifier operation and trouble shooting for the Korea IGCC demonstration plant. It will also be applied as a useful tool to develop scale-up design technology of IGCC and proceed to commercialization.

• 한국항공운항학회지
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• 제25권2호
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• pp.63-68
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• 2017

In the present study, a wind tunnel test for a rotor-blade configuration was conducted to investigate a basic aerodynamic performance and a effect of the cross wind. The diameter of the configuration was 1.46 m and the test was carried out for both a clean and a tripped configurations. The boundary layer for the trip configuration was simulated by zig-zag tape and the test performed on constant-velocity and constant-rotational modes. It was shown that the test result for the tripped configuration reduces the maximum power coefficient by 9.4% ~ 12.1% compared to the clean one. Within $5^{\circ}$ of the flow angle, there is no significant loss of power, however, the coefficient is reduced by 5.3% ~ 36.7% in the range of $10^{\circ}{\sim}30^{\circ}$.

• 한국의류학회지
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• 제19권5호
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• pp.790-800
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• 1995

This study was done to provide basic data for better fittness of infants and children's clothes and to get the developmental aspect of the subjects. The subjects were total 610 infants and children, 302 boys and 308 girls between month 12 to 59. 67 dependent variables were analyzed by the method of Duncan Test as Multiple Range Test among 8 groups anti T-test between male and female of same age groups. Following results were obtained: 1. In Duncan Test of the direct measurement items, the most subjects between group 1 and 8 were significantly different in the majority of dependent varibles, especially in height and length items 2. In Duncan Test of the body indices, as the subjects 'ages are higher, their bodies were balanced with the growth of the girth of their lower body. 3. In T-test, the significant difference between male and female of same month group was appeared mainly from 4th group to 7th group.

• International Journal of Aeronautical and Space Sciences
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• 제18권1호
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• pp.63-69
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• 2017

In this paper, composite laminate pull-through resistance was analyzed using the FEM method and compared with test results. 2D and 3D simplified FEM models, a nonlinear analysis, and a progressive failure analysis utilizing three composite laminate failure theories Maximum Stress, Maximum Strain, and Tsai-Wu were used to predict the FEM results with the test results. The load and boundary conditions of the test were applied to the FEM to simulate the test. A composite laminate pull-through test (ASTM D7332 Proc. B) was designed with a special fixture to collect more precise data. The test results were compared with the FEM analysis results.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2008년도 한국우주과학회보 제17권2호
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• pp.29.1-29.1
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• 2008

The temperature control system which is using liquid and gaseous nitrogen has been known as the most economical system to simulate space temperature condition due to relatively not expansive price of the liquid nitrogen (less than 0.2 USD per liter). And, among these systems, the closed loop system which circulates compressed nitrogen gas come from sprayed liquid nitrogen by blower and makes a target temperature with heat from an electrical heater and flow rate of liquid nitrogen is prevail all over the world. But, this complete closed loop system requires expansive equipments such as blower, heater, and liquid nitrogen injector, and special maintenance on the system. Therefore, KARI is developing efficient and simple open loop system which utilizes liquid and gaseous nitrogen with eliminating a special blower and other expansive units. In this study, this open loop system with more efficiency and flexibility will be designed and introduced.

• 한국압력기기공학회 논문집
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• 제8권1호
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• pp.19-24
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• 2012

This paper presents the results of finite element analysis for the effects of hydrostatic test and operating condition on the weld residual stress at dissimilar metal weld of a pressurizer safety nozzle in a nuclear power plant. For the study, the weld residual stress at ambient condition was analyzed using ABAQUS in the first place. After the weld residual stress analysis, the hydrostatic test condition and operating condition was applied to the same model one after another. The weld residual stress was observed to change due to the successive hydrostatic test and operating condition. The axial residual stresses on inner surface of the dissimilar metal weld and HAZ region were decreased by hydrostatic test and operating condition, which gives beneficial effect on preventing primary water stress corrosion cracking.

• 자동차안전학회지
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• 제4권1호
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• pp.5-11
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• 2012

This paper discusses the evaluation of the safety impact of the Adaptive Cruise Control (ACC) system in Korea. To evaluate the safety impact, this paper suggests an analysis method by using the test scenario and field operational test data. The test scenario is composed to represent the main component factor of the ACC system and ACC related accident situation such as rear-end collision, lane-change, and road-curvature, etc. Also, from the field operation test data, the system's potential to increase the safety can be measured ideally. Besides, field operational testdata was used to revise the expected safety impact value as Korean road conditions. By using the proposed evaluation method, enhanced safety impact of the ACC system can be estimated scientifically.