• Journal of electromagnetic engineering and science
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• 제3권1호
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• pp.12-16
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• 2003

In this paper, low noise amplifiers with coplanar waveguide structure are presented for Wireless LAN data communication application. For comparison of microwave performance, LNAs of cascode type and balanced type using cascode cell with the same substrate and same bias conditions are designed and implemented. A cascode type of LNA shows the gain of 12.45 ㏈, input return loss of 11.63 ㏈, and noise figure of 1.52㏈. A balanced type of LNA using cascode cell shows the gain of 6.58 ㏈, input return loss of 16.6 ㏈, and noise figure of 1.18 ㏈.

• 컴퓨터교육학회논문지
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• 제11권6호
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• pp.95-102
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• 2008

본 연구에서 SDG를 사용한 교육 퍼즐구현을 통하여 협동학습을 컴퓨터교육에 적용하였다. SDG란 하나의 컴퓨터 디스플레이에 다중 입력장치로 협동적인 작업을 할 수 있는 시스템을 말한다. SDG 기반의 협동학습을 통해 학습자들은 협동 학습을 수행하게 된다. SDG를 이용한 협동학습이 단일 디바이스를 이용한 개별 학습보다 우월하다는 기존의 연구가 있다. 이를 바탕으로 협동학습을 이용한 퍼즐게임을 구현하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 심포지엄 논문집 정보 및 제어부문
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• pp.78-80
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• 2006

Mouse is widely used in multimedia education. However, using mouse is not easy for user to get exact three dimentional (3D) user input and to manipulate delicately as the user can not know the surface information of virtual objects, which are typical drawbacks of using mouse in multimedia education, especially in 3D multimedia contents authoring. In this paper, haptic device is introduced to the 3D multimedia education. The haptic device provides 3D user's input information as well as haptic information of virtual objects such as surface textures, collisions and etc. which thus allow to enhance the task efficiency in multimedia education. Simple experiment results are presented to show the positive results of using the haptic device in multimedia education.

• 수산해양교육연구
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• 제28권6호
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• pp.1812-1821
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• 2016

The purpose of this study is to survey input data error of ship automatic identification system (AIS) and suggest its improvement. The effects of AIS were observed. Input data error of AIS was investigated by dividing it into dynamic data, static data by targeting actual ships and its improvement method was suggested. The findings are as follows. Looking into accidents before and after AIS is enforced to install on the ship, total collision were decreased after AIS installed. Static data error of AIS took place mainly in the case that ship name, call sign, MMSI, IMO number, ship type, location of antenna (ship length and width) were wrongly input or those data were not input initially. Dynamic data error of AIS was represented by input error of ship's heading. As errors of voyage related data take place as well, confusion is made in sailing or ship condition. Counter measures against the above are as follows. First, reliability of AIS data information should be improved. Second, incessant concern and management should be made on the navigation officers.

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2001년도 Bulletin of The 5th Asian Design Conference International Symposium on Design Science
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• pp.8.1-8
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• 2001

• 한국산학기술학회논문지
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• 제12권12호
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• pp.5405-5411
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• 2011

본 연구에서는 교량용 구조용 강재인 HSB600 강의 용접부에서 입열량 (1.5~3.6 kJ/mm)과 용접후 열처리(PWHT, $600^{\circ}C$, 40hr.)가 미세조직과 기계적 특성에 미치는 영향에 관해 연구하였다. HSB600 강재를 GMA용접을 실시하였다. 용접된 상태에서는 인장강도와 경도는 입열량이 증가할수록 저하되었으며 충격 흡수 에너지는 큰 차이를 보이지 않았다. 낮은 입열량인 1.5 kJ/mm에서 침상형 페라이트가 가장 많이 생성되었다. 용접후 열처리를 통해 경도와 인장강도가 저하되었고, 용착금속의 충격흡수에너지가 증가되었다.

• Journal of Forest and Environmental Science
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• 제36권2호
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• pp.163-172
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• 2020

The objective of this study was to develop evaluation criteria for forest education using the Context, Input, Process, and Product (CIPP) model. To this end, we designed a survey based on expert advice and content analysis of previous studies on the CIPP model and forest education. The survey was conducted on 393 forest education specialists, and Cronbach's α coefficient was set as 0.6 or higher to verify reliability and validity, and to determine reliability by factor. Eventually, 52 out of 57 evaluation items were extracted, and the evaluation indexes were selected through factor analysis as follows: four evaluation indexes for the context dimension, namely "Clarity of goal setting," "Developing conditions for education," "Meeting of requirements," and "Institutional drive"; three evaluation indexes for the input dimension, namely "Acquisition of education infrastructure," "Establishment of operational support," and "Adequacy of assigned manpower"; four evaluation indexes for the process dimension, which were "Adequacy of budget allocation," "Expertise of forest education instructors," "Diversity of programs," and "Public-private academic partnership"; and five evaluation indexes for the product dimension, namely "Effectiveness of perception change," "Influence over the society," "Continuity of improvement in evaluation," "Continuity of education," and "Verification of the effects of education."

• 생태와환경
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• 제43권1호
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• pp.161-167
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• 2010

In this study, we implemented an experimental approach of ecological model development in order to emphasize the importance of input variable selection with respect to time-delayed arrangement between input and output variables. Time-series modeling requires relevant input variable selection for the prediction of a specific output variable (e.g. density of a species). Inadequate variable utility for input often causes increase of model construction time and low efficiency of developed model when applied to real world representation. Therefore, for future prediction, researchers have to decide number of time-delay (e.g. months, weeks or days; t-n) to predict a certain phenomenon at current time t. We prepared a total of 3,900 equation models produced by Time-Series Optimized Genetic Programming (TSOGP) algorithm, for the prediction of monthly averaged density of a potamic phytoplankton species Stephanodiscus hantzschii, considering future prediction from 0- (no future prediction) to 12-months ahead (interval by 1 month; 300 equations per each month-delay). From the investigation of model structure, input variable selectivity was obviously affected by the time-delay arrangement, and the model predictability was related with the type of input variables. From the results, we can conclude that, although Machine Learning (ML) algorithms which have popularly been used in Ecological Informatics (EI) provide high performance in future prediction of ecological entities, the efficiency of models would be lowered unless relevant input variables are selectively used.

• 수산해양교육연구
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• 제11권1호
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• pp.1-23
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• 1999

The fisheries control system being now enforced in all countries may be generally classified as three types - the input control system, the output control system, and the technical control system. In Asian countries that have relatively small fishery scales, diverse object species and the fisheries resources has been regarded as "governmental possessions", fisheries have been controled subsidiarily using the technical control system based on the input control system traditionally. While in Europe and America that have relatively large fisheries scales, simple object species and the fisheries resources has been regarded as "common property", fisheries have been controled subsidiarily using the input control system and the technical control system based on the output control system. In Korea, fisheries have been controled subsidiarily using the technical control system based on the input control system traditionally, nevertheless overexplotation and overcapitalization have not been solved. Recently the EEZ was promulgated, the total allowable catch system was introduced to control the EEZ. But the output control system is totally different from the input control system of the Korea traditional fisheries system, simultaneous availableness of both system is considerably difficulty. Therefore a study on new systems to make both systems harmonized has to be performed. The thesis is aimed at presenting the general improvement direction of the Korea fisheries control system as the basis for establishment of the new fisheries control system.

• 실천공학교육논문지
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• 제16권3_spc호
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• pp.259-265
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• 2024

대학 학부생들의 SW융합 역량을 향상하기 위해서는, 관련 강좌의 개발과 함께 학부생들의 코드 설계 역량을 평가하는 방법이 연구되어야 한다. 기존 연구에서는 코드 결과물에 대해 정성적인 평가방법과 정량적인 상대평가방법이 있었으며, 정량적인 상대평가방법에서는 문제분해깊이 수, 함수재사용 회수와 함수 개수를 측정하여 평가하였다. 본 연구에서는 기존 연구에서 제시되지 않은 평가방법으로서, 코드 설계 시 입력과 출력 정보종류의 수를 제시하는 문제를 이용한 평가방법을 제안하였다. 본 논문에서 제안한 평가 문제들은 입력 정보 종류의 수와 출력 정보 종류의 수를 3개까지 적용하였다. 이를 통해 5가지 코드설계 평가문제를 제시하고 코드설계 점수를 정량적으로 산출하는 방법을 제안하였다. 제안한 평가방법을 적용한 강좌를 통해 100명 학생 응답자들의 코드들을 수집하고 분석하였다. 결과 분석을 통해, 문제분해깊이 수는 입력 정보의 종류 개수에 비례하고, 함수 재사용 회수는 출력 정보의 종류 개수에 비례하며, 함수 개수는 입력과 출력 정보의 종류 총개수에 비례하는 상관성을 나타내었다. 마지막으로 100명 응답자의 평가 점수 분포를 분석하여, 5가지 입출력 정보 조건 평가문제에 따른 코드설계 평가 방법이 유효함을 설명하였다.