• 대한공업교육학회지
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• v.32 no.1
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• pp.33-54
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• 2007

The purpose of this study was to verify the effects of cooperative learning on academic achievement of the maintenance of intake and exhaust stroke education in the technical high school. The following null hypotheses were stated and utilized for the purpose of the study. (1) Taxonomy of educational objectives(cognitive, affective and psychomotor domain) and (2) the level of entering behavior To verify the hypotheses of the study, 2 parts(17 students in each part) of the second grades from technical high school were selected. The data were collected and interpreted statistically by t-test using SPSS(ver. 10) at the .05 level of significance. The result of this study were as follows; First, learning together cooperative learning had little effect on the academic achievement in the cognitive domain but the affective and psychomotor domain were more effective than the traditional teaching method on the taxonomy of educational objectives. Second, learning together cooperative learning was effective on the academic achievements of lower and higher ability group of students, while wasn't effective on middle ability group in the level of entering behavior.

• Science of Emotion and Sensibility
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• v.6 no.3
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• pp.1-11
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• 2003

The purpose of the present driving simulation study was to examine the effect of cellular-phone use on driving performance when required driving speeds were systematically varied(60, 80, 100, or 120km/h) while either using cellular-phones(experimental condition; Hands-Free or Hands-Held) or not(control condition). Driving performance was measured both by longitudinal vehicle control(i.e., variabilities in driving speed and headway) and lateral vehicle control(variabilities in lane position). The results can be summarized as followings: (1) The significant difference in driving speed variation between the two cellular-phone usage conditions was found only at relatively higher driving speed conditions(i.e., over 80km/h). (2) Only in the experimental condition where cellular-phone was required to be used while driving, the magnitudes of variation in driving speed, headway and lane position were gradually increased as the required driving speeds were increased(this tendency was not found in control condition). And. (3) the dependent measures of this study appeared to suggest that cellular-phone usage itself (rather than the types of cellular-phone) had significant impact on driving performance. Finally, implication and issues related to this study were discussed.

• Journal of the Korean Society for Marine Environment & Energy
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• v.11 no.4
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• pp.221-226
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• 2008

Air pollution associated with the SOx emission from the shipboard propulsion and generation engines is becoming one of the major environmental concerns these days. Lead by the international organizations including IMO and European Union, a significantly strengthened air pollution related regulations have been introduced and they are becoming in practice as scheduled. Such rules are basically giving the guidelines for permissible SOx emission which can be only met by using high quality fuel oils with less sulfur content or operating scrubbing systems aiming at reducing SOx at the engine exhaust. Since both countermeasures can lead to the cost increase in ship building and operation, Korean shipbuilding industries, leading the world's market, need to be well aware of the ever changing regulations and be prepared with proper solutions. Here, we briefly summarize such latest rules and regulations on the air pollution at sea, and review some technical issues on the scrubbing systems available with some suggestions.

• Journal of Advanced Navigation Technology
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• v.15 no.4
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• pp.602-608
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• 2011

In this paper, we implemented an android mobile management application of intelligent prevention of disaster system which can manage the current status monitoring and whether operating or not by using Ubiquitous Sensor Network based self wireless communication system of scattered emergency light, fire extinguishers and sprinkler inside the high complex building. This system is composed with fire facilities attached sensor nodes, management server for collection of information and control, and smart phone application that transmits and receives information with management server. As a result of the test, the embodied android-based smart phone application to be performed anywhere could confirm status and monitoring information of fire facilities which are communicated with the management server.

• Proceedings of the Korea Society for Simulation Conference
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• 1992.10a
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• pp.2-2
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• 1992

최근 여러 분야에서 컴퓨터의 용도가 확산되고 더 높은 computing power에 대한 요구가 증가함에 따라, 컴퓨터의 성능을 향상시키기 위하여 프로세서의 고속화와 함께 시스템 구조의 개선을 위한 많은 연구가 진행되고 있다. 한 시스템내에 여러 개의 CPU들이 존재하는 다중프로세서 시스템(multiprocessor system) 구조를 가진 슈퍼미니급 중형 컴퓨터들은 상호연결망으로서 버스(bus) 방식을 많이 채택하고 있다. 버스 구조는 하드웨어가 간단하여 구현이 용이하지만, 여러 개의 시스템 지원들(프로세서들, 기억장치 모듈들 및 입출력 모듈들)이 버스를 공유하기 때문에 경합으로 인한 지연 시간이 발생하게 된다. 이러한 지연 시간으로 인한 성능 저하를 개선하는 방법으로는 버스 수의 증가와 최적 통제 프로토콜의 설계가 있다. 본 연구에서는 여러 개의 버스를 가진 다중프로세서 시스템에서 4가지 대표적인 버스 중재 프로토콜들에 대해 성능을 분석, 비교하여 최적 프로토콜을 제시하고자 한다. 이러한 대규모 하드웨어에 의하여 구현되는 시스템에서 주요 설계 요소들에 따른 시스템 성능 분석과 비교는 설계 단계에서 필수적인 과정이다. 그러나 하드웨어를 만들어서 분석하는 방법은 시간과 비용이 많이 소요되기 때문에 소프트웨어 시뮬레이션 방법이 널리 사용되고 있다. 본 연구팀에서는 시뮬레이션 전용언어인 SLAM II를 이용하여 다중프로세서 시스템의 시뮬레이터를 개발하고, 버스중재 프로토콜(bus arbitration protocol)을 용이하게 변경할 수 있도록 하여 각각의 성능을 비교하였다. 이 연구에서 비교된 프로토콜들은 고정-우선순위 방식(fixed-priority scheme), FIFO(first-in first-out) 방식, 라운드-로빈 방식(round-robin scheme), 및 회전-우선순위 방식(rotating-priority scheme) 등이다. 실험은 시스템의 주요 요소들인 프로세서와 기억장치 모듈 및 버스의 수들을 변경시킴으로써 다양한 시스템 환경에 대한 분석을 시도하였다. 작업 부하가 되는 기하장치 액세스 요구간 시간가격(inter-memory access request time interval)은 필요에 따라서 고정값 또는 확률 분포함수를 사용하였다. 특히, 실행될 프로그램의 특성에 따라 각 프로토콜의 성능이 다르게 나타날 수 있음을 검증하였으며, 기억장치의 지역성(memory locality)에 대한 프로토콜들의 성능도 비교하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1489-1492
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• 2008

전자 ID 지갑은 일상생활에서 사용하는 지갑처럼 인터넷 상에서 사용되는 사이버 지갑으로, 사용자의 개인정보(주소, 전화번호 등), 인증정보, 지불정보 등과 같은 사용자의 Identity 정보를 보관하고 있다가 필요한 시점에 저장된 정보를 사용자의 통제 하에 자유롭게 이용할 수 있는 서비스 시스템이다. 모바일 전자 ID 지갑 시스템은 전자 ID 지갑 시스템의 구성 요소 중 하나로 개인의 모바일 단말장치에서 운영될 수 있는 소프트웨어로 구현되었으며, 사용자 인터페이스가 빈약한 모바일 단말장치에서도 사용자의 불편 없이 모바일 인터넷을 보다 안전하게 이용할 수 있는 방법들을 제공한다. 논문에서는 안전하고 신뢰할 수 있는 인터넷 환경 구축을 위해 개발된 기술들 중 하나인 모바일 전자 ID 지갑 시스템을 소개하고자 한다.

• Korean Security Journal
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• no.44
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• pp.59-83
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• 2015

This study is made for the purpose of analyzing the influencing factors evidently to the private security guards' job resourcefulness. Consequently this study will offer effective ways to develop the private security guards job resourcefulness. Throughout the previous study of job resourcefulness, we selected the influencing factors to the job resourcefulness, as follows : system of reward, staff development opportunity, participation in decision making, self-control and other-control for locus of control, need for achievement, self-esteem. To prove this subject, we distributed the questionnaire to the private security guards of Seoul, Incheon and Gyeonggi. So we used 248 answers sheets for the final analysis. As the result above study, system of reward, participation in decision making, self-control and other-control for locus of control, need for achievement, self-esteem influenced the job resourcefulness positively. Accordingly it is essential that various educational programs and objective evaluations are designed to improve the organizational and individual characteristics of private security guards. However the staff development opportunity don't have an influence on the job resourcefulness. On the basis of above study result, this study suggested some necessary ideas on managing and administrating the organization of private security effectively in the future.

• Journal of the Korea Society for Simulation
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• v.31 no.3
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• pp.45-54
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• 2022

This paper is about designing and implementing the simulation training equipment (simulator) for the CBRN Reconnaissance Vehicle-II (armor type). The simulation training equipment (simulator) is a military training equipment in a virtual environment that analyzes the training using various CBRN equipment according to the CBRN situation and make a professional report. The controller or training instructor can construct a scenario using the instructor control system for a possible CBRN situation, spread the situation, and observe the process of the trainee performing the propagated situation appropriately. All process can be monitored and analyzed by the system, and it can be recorded, so it is also used for AAR (After Action Review). To implement CBRN situation training in a virtual environment, instructor control (IOS), host (HOS), video (IGS), input/output device (IOC), and sound (ACS) were implemented, a long-range chemical automatic detector (LCA), a combined chemical detector (CAD), a control (MCC) and an operation (OCC) computer were developed as simulators. In this paper, the design and development of simulation training equipment for CBRN Reconnaissance Vehicle-II (armor type) was conducted, and the performance was verified through integrated tests and acceptance tests.

• Journal of Digital Contents Society
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• v.14 no.2
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• pp.255-262
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• 2013

Useful applications for English education enable immediate conversion of mobile devices into remote wireless systems for classroom computers. Once the free software has been installed in the main computers in the classroom, using powerpoint, students can operate the computers through their mobile devices by installing Air mouse on them. By using this, the students can draw or write on the "board" to manipulate the educational resources from where they are/from their seats. The study of English language encompasses not only academic study but also language training. Until recently, the issue of the English language learning has been ridden with certain problems-instead of being a tool that facilitates communication, its main purpose has been for school grades, TOEIC, and TOEFL. This study suggests English language learning methodology using various applications such as mobile, VOD English language content, and movie scripts in implementing easy and fun English language learning activities that can be studied regularly. This is operationalized by setting a specific limit on learning and by using various media such as podcast, Apps, to increase interest, motivation, and self-directed learning in a passive learning environment.

• Journal of Advanced Navigation Technology
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• v.22 no.2
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• pp.173-178
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• 2018

In May 2015, the first case of Middle East Respiratory Syndrome occurred, leaving 186 patients, 38 deaths, and 16,693 quarantine patients. The government has carried out a monitoring of people in contact with the confirmed or suspected patients to prevent the spread of MERS infection. The management staff conducted monitoring of the quarantine subject twice a day during the 14-day period, to check compliance with isolation. However, as the number of people subject to isolation was increased explosively, such issues as the occurrence of residents occurred due to limitations of management personnel. Managers have also admitted that their home quarantine rules have become nominal when they checked the status of quarantine subject by using a call only two or three times a day, and that it is virtually impossible to control when the departees leave without permission. In this paper, home quarantine equipments and their means of authentication are proposed and verified. As a result of the verification, the proposed methods in this paper are expected to be used later as their own authentication method for home quarantine equipments.