• Journal of the Korea Institute of Military Science and Technology
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• v.10 no.1
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• pp.5-13
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• 2007

The trajectory of an current artillery munition is subject to a variety of different error sources resulting in more or less big deviation from the nominal predicted flight path. The 1D CCM(Course Correction Munition) has appeared to solve this problem and the mechanism of 1D CCM is a simple and low cost one using the influence of drag to range behavior of an artillery munition. In the paper 1D CCM concept has been simulated using wind tunnel experiment results of the specified Korean munition with CCF(Course Correction Fuze) and calculated the performance of its rang error reduction. From the simulated results it can be numerically explained that the possibility of adaptation of 1D CCM concept to Korean artillery munitions.

• International Journal of Aeronautical and Space Sciences
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• v.11 no.2
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• pp.118-125
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• 2010

This paper describes a mid-course guidance strategy based on the earliest intercept geometry (EIG) guidance. An analytical solution and performance validation will be addressed for generalized mid-course guidance problems in area air-defence in order to improve reachability and performance. The EIG is generated for a wide range of possible manoeuvres of the challenging missile based on the guidance algorithm using differential geometry concepts. The main idea is that a mid-course guidance law can defend the area as long as it assures that the depending area and objects are always within the defended area defined by EIG. The velocity of Intercept Point in EIG is analytically derived to control the Intercept Geometry and the defended area. The proposed method can be applied in deciding a missile launch window and launch point for the launch phase.

• Journal of Navigation and Port Research
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• v.27 no.6
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• pp.631-638
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• 2003

Yaw-checking and course-keeping ability in IMO's ship manoeuvrability standards are reviewed from the viewpoint of safe navigation. Three kinds of virtual series-ships, which have different course instability, are taken as test models. The numerical simulation on Z-test is carried out in order to examine the correlation between known manoeuvrability in spiral characteristics and various kinds of overshoot angle. Then simulator experiments are executed with series-ships in a curved, narrow waterway by six operators(five active pilots and one ex-captain) in order to examine the correlation between known manoeuvrability and degree of manoeuvring difficulty. IMC criteria for yaw-checking and course-keeping ability are discussed and revised criteria are proposed.

• Korea journal of population studies
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• v.22 no.2
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• pp.47-71
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• 1999

이 연구는 결혼시기에 결혼 이전의 생애과정이 미치는 영향을 분석하고 있다. 자료는 1983년 전국인구이동조사의 개인 생애사 자료이다. 분석방법은 이산시간 사건사분석을 사용하고 있다. 이 연구는 생애과정을 생애사건의 연쇄로 파악하여 생애사건연쇄분석을 하고 있다. 이 연구에서는 생애과정이 결혼시기에 미치는 영향을 네 가지의 가설로 설정하여검증하고 있다. 연구결과 결혼이전의 생애과정이 결혼시기에 미치는 영향은 성별로 차이가 있음을 보여주고 있다. 또한 생애과정인지에 따라 결혼시기에 미치는 영향도 차이가 있음을 보여 주고 있다.

• Journal of the Korea Institute of Military Science and Technology
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• v.3 no.1
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• pp.38-46
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• 2000

In this paper, robust depth and course controllers of AUV(autonomous underwater vehicles) using LMI-based H$_{\infty}$ servo control are proposed. The $H_{\infty}$ servo problem is modified to an $H_{\infty}$ control problem for the generalized plant that includes a reference input mode, and then a sub-optimal solution that satisfies a given performance criteria is calculated by LMI(Linear Matrix Inequality) approach. The robust depth and course controllers are designed to be satisfied the robust stability about the modeling error generated from the perturbation of the hydrodynamic coefficients and the robust tracking property under sea wave and tide disturbances. The performances of the designed controllers are evaluated by computer simulations, and these simulation results show the applicability of the proposed robust depth and course controller.

• Journal of information and communication convergence engineering
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• v.7 no.4
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• pp.570-575
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• 2009

This paper describes an implementation of project-based learning in routing design course. The total students who enrolled in the class were 48 and were divided into groups of 3~4 students. At the beginning of the course, a survey was conducted to check the student's level of back ground knowledge acquired from the prerequisite courses. At the end of the curse, we also conducted a survey to evaluate the effect of project-based learning. According to the end of course survey, the course was helpful to identify the problems to solve by themselves, to develop the problem solving ability, and to understand the global picture of the subject by integrating knowledge of each chapter into a project. The survey also shows that students recognized the importance of the teamwork skill throughout the project activity.

• The Korean Journal of Community Living Science
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• v.15 no.2
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• pp.3-15
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• 2004

This study examines the various types of consciousness about sexuality exhibited by girls' high school students. The analysis was carried out utilizing two subject groups with the first being academic course students and the second being vocational course students. A 51 question questionnaire was prepared based on a literature review and previous research. The questionnaire was developed based on the results of two preliminary surveys, a reliability test, and a correction. A total of 721 questionnaires were distributed to students of 3 vocational and 3 academic courses. The analysis of the results was carried out using by means of SPSS 10.0. The study generated conclusive findings about each groups' viewpoint toward sex, the actual condition of their relationship with members of the opposite sex, the passages of knowledge about sex, the content of current sexuality education at school and the ideal type of sexuality education. This study shows that the current standardized content of sexuality education is ineffective. Sexuality education at schools in South Korea has reached a point, where research for more effective sexuality education is required.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.7 no.4
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• pp.82-95
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• 2008

As society has changed to being more knowledge-based, it is necessary that change of paradigm is incorporated into engineering education and the education goals and the assessment method of educational outcomes is developed to promptly meet the needs of the times. A purpose of this study is to measure learning outcomes in coursework of engineering college every semester, which ultimately provides to validate program outcomes. We looked into teaching-learning style of course in the engineering college and analyzed its grade method and tool. By use of a survey, we derived a reasonable method to measure for the learning outcomes in course and presented tools for course-embedded assessment to measure that learning outcomes had been tied to their objectives. These tools are effective to determine that program outcomes and education goals have been achieved, ultimately. In addition, it will help that instruction builds a loop system for better.

• East Asian mathematical journal
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• v.34 no.2
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• pp.155-176
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• 2018

The purpose of this article is to study the change of mathematics teaching efficacy of pre-service mathematics teachers in teaching practice course. For this purpose we collect data through questionnaire from 61 pre-service mathematics teachers. To make a questionnaire we rearrange Ryang's MTES items. The pre-service mathematics teachers fill out the questionnaire before and after teaching practice course. The data are analyzed by paired t-test using SPSS23. The result of paired t-test show that the difference between pre-test scores and post-test scores is significant statistically. So we can conclude that the mathematics teaching efficacy of pre-service mathematics teachers is changed and improved after teaching practice course.

• Journal of Engineering Education Research
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• v.14 no.6
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• pp.31-40
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• 2011

This paper explores and proposes the evaluation criteria of design projects in the entry-level design course. In the entry-level engineering design course the students proceeds various design projects to understand the concept of engineering design process and to develop the creativity. The evaluation criteria of design projects is very important component because the outcome of students in the engineering design course are effected from the evaluation criteria that enforces the students to focus on doing their task. According to this case study the evaluation criteria can be good solution to evaluate the design projects. By the outcome standard of ABEEK on the entry-level engineering design course the evaluation criteria was selected with the results of design projects such as design plan, report, handicrafts, objectives.