• 디지털산업정보학회논문지
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• 제14권4호
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• pp.163-168
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• 2018

In this paper presents comparison of performance of flexible solar cells construction applied to curtain walls. The proposed paper compares power generation for curtain walls of various shapes using flexible PV. Through the comparison of performance, the power generation was compared by installing various types of flexible PV on the air layer of double windows. By comparing the measured power generation, it is possible to find an optimal flexible PV shape that can be applied to a curtain wall. Flexible PV installation was divided into diagonal, S and W shapes. As a result of comparison, the amount of power generation when there was no flexure of flexible PV was large. Also, as the angle with the light source increased, the power generation decreased. Therefore, it is necessary to study the structure which can fix the PV more than the flexible PV and to be able to direct the sun without distortion.

• 대한가정학회지
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• 제26권3호
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• pp.225-241
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• 1988

The purpose of this study is to find the difference between the parents generation and that of the children in the disciplinary methods by means of parental social population variation. With these purpose in mind, the problems have been suggested like following: 1) what are the general differences of between the two generations of parents and children in disciplinary method? 2)What are the general differences of the views between those two generations according to sex? 3) What are the general differences between the parents generation and the child generation according to age? 4) What are the general differences between the parents generation and the child generation according to education level? 5) What are the general differences between the parents generation and the child generation according to income level? In order to solve these problems, questionnaries were distributed on this appendix 374parents (father: 177, mother: 197) who have the children. Questionnaires were compose on "Parents Inventory" of Radke were employs, classfied five measures. To test and verifying the above hypothes, the following five measures. were used. 1) Philosophy of authority (authoritarian vs. democratic) 2) Parental restrition (strict and stubbon vs. democratic) 3) Severity of punishment (severity vs. mildness) 4) Parent-child rapport 9desirable vs. undesirable) 5) Relative responsibility of father and mothehr towards child disciplinary (equal vs. differ) The result of this study is like follows: 1) In general comparison of two generations, tends to be more democratic in the philosophy of authority, more relaxed and easygoing in the parental restroction, more severe in the severity of punishment, and good rapport in the parent-child rapport than grandparents generation and the responsibility of father don't change but that of mother tends to augment in child disciplinary 2) In comparison of two generation according to sex, the mother showed more democratic in the philosophy of authority and closely perceive her parents in the parent-child rapport as compared with the father. 3) In comparison of two generation according to age, the younger parents showed more relaxed attitudes towards the child disciplinary, the perception better relations of their parents in the parent-child rapport. 4) In the comparison of two generations according to education level the more educated parents showed the more relaxed and easygoing attitude towards in the parental restriction. 5) In comparison of two generation according to income, as the parents of large income generally (not always) showed easygoing than their previous generation in the parental restriction, and they perceive that they have a good one in parent-child rapport. This study caused by the some difficult problem required futher investigation on the result of two generations the problems happened in the inner unitary of items. And, it proposed some problems which constitutes the problems of the proper interpretation of the results between two generations brought about discordance of items between tow generations

• 대한안전경영과학회지
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• 제8권4호
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• pp.249-265
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• 2006

A life cycle assessment(LCA) is increasing its applicability as a powerful tool for an environmental burdens analysis. In this study, some cases are compared in terms of analysis procedures and results obtained with LCAs for evaluating power generation technologies in Korea. For the comparison, 3 power generation technologies are selected because they produces almost 90% of 2003 total electricity generation in Korea. It is shown that the range of evaluation values amounts to maximally the order of about 105, which is rather large discrepancy than the level of 101 in comparison with foreign studies. The difference seems to be due to the simplicity of modeling used in each case study. It is proposed that this large discrepancy should be obviously clarified to improve their reliability in that electricity is a essentialness for all industries and the capacity of LCA of national-level electricity affects the results of LCA for the other sectors.

• International journal of advanced smart convergence
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• 제12권2호
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• pp.67-75
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• 2023

Recently, many studies have been conducted on ways to utilize AI technology in NIDS (Network Intrusion Detection System). In particular, CNN-based NIDS generally shows excellent performance. CNN is basically a method of using correlation between pixels existing in an image. Therefore, the method of generating an image is very important in CNN. In this paper, the performance comparison of CNN-based NIDS according to the image generation method was performed. The image generation methods used in the experiment are a direct conversion method and a one-hot encoding based method. As a result of the experiment, the performance of NIDS was different depending on the image generation method. In particular, it was confirmed that the method combining the direct conversion method and the one-hot encoding based method proposed in this paper showed the best performance.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제11B권4호
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• pp.169-174
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• 2001

A novel simulation scheme of transient phenomenon for the photovoltaic (PV) generation system under the real weather conditions has been proposed in this paper. A grid connected PV array is simulated using PSCAD/EMTDC. The transient changes of the output current of PV array under the real weather conditions is described and the output current of DC/AC converter flowing through the utility power network is also analyzed with the PWM switching width. Moreover, the MPPT control of PV generation system is combined to the system during the simulation for the comparison purposes of the control schemes. The outcome of the simulation demonstrates the effectiveness of the proposed simulation scheme. The result shows that the cost effective verifying for the efficiency or availability and stability of PV generation systems and the comparison research of various control schemes like MPPT under the same real whether conditions are eventually possible.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.435-438
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• 2008

The huge economical damage and environmental pollution have been occurred for decades because of using of fossil fuel. So the development of alternative energy is urgent. In the west sea of Korea, a proper area for tidal power plant, development and investigation for economical efficient of tidal power plant are preceeding. The water turbine generator with the capacity of 25.4MW was used to compare single-basin flood tide generation with ebb tide generation while considering the water depth and tide in the vicinity of Sukmodo.

• 한국산업정보학회논문지
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• 제27권5호
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• pp.1-11
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• 2022

딥러닝 기술의 발전에 따라 학습을 통해 선호도 랭킹 추정을 하기 위한 다양한 연구 개발이 진행되고 있으며, 웹 검색, 유전자 분류, 추천 시스템, 이미지 검색 등 여러 분야에 걸쳐 이용되고 있다. 딥러닝 기반의 선호도 랭킹을 추정하기 위해 근사(approximation) 알고리즘을 이용하는데, 이 근사 알고리즘에서 적정한 정도의 정확도를 보장할 수 있도록 모든 비교 대상에 k번 이상의 비교셋을 구축하게 되며, 어떻게 비교셋을 구축하느냐가 학습에 영향을 끼치게 된다. 이 논문에서는 크라우드 소싱 기반의 딥러닝 선호도 측정을 위한 쌍체 비교 셋을 생성하는 새로운 알고리즘인 k-disjoint 비교셋 생성 알고리즘과 k-체이닝 비교셋 생성 알고리즘을 제안한다. 특히 k-체이닝 알고리즘은 기존의 원형 생성 알고리즘과 같이 데이터 간의 연결성을 보장하면서도 안정적인 선호도 평가를 지원할 수 있는 랜덤적 성격도 함께 가지고 있음을 실험에서 확인하였다.

• 대한원격탐사학회지
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• 제25권4호
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• pp.359-366
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• 2009

현재 Kompsat-2 영상을 이용한 정밀 DEM 제작에 관한 연구는 미비한 실정이다. 본 논문에서는 Kompsat-2 위성영상을 이용하여 정밀 DEM을 제작하고, 이렇게 제작된 DEM을 상용 소프트웨어인 PCI Geomatica, ENVI에서 제작된 DEM과의 비교를 통해 그 성능을 분석하였다. DEM의 제작을 위해 Kompsat-2에 가장 적합하다고 보고된 궤도-자세각 모델을 사용하였으며, 에피폴라 곡선의 기하학적 요소들을 이용한 정합방식을 사용하여 Kompsat-2 DEM의 제작을 시도하였다. 각 상용프로그램과의 성능의 비교는 육안을 통한 정성적 실험과, USGS DTED를 이용한 정량적 실험으로 이루어졌다. 정확도는 DTED와의 평균절대오차, RMS 오차로 판단하였으며, 비교 실험 결과, 대부분의 영상에서 실험에 사용한 방식이 다른 상용 프로그램에서 제작된 DEM보다 더 좋은 성능을 보여줌을 확인할 수 있었다.

• KIEAE Journal
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• 제14권6호
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• pp.87-92
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• 2014

The objectives of this study are to investigate input variables of photovoltaic generation programs and to compare their prediction to actual generation of photovoltaic system in the C city hall and the C city sewage treatment plant. We investigated the actual amount of generation, the forecast amount of generation, the amount of solar radiation data, and calculated the relative errors. We simulated the photovoltaic system of C city hall and the C city sewage treatment plant located in Chungju using existing programs, such as SAM, RETSCREEN, HOMER, PV SYST, Solar Pro. The result of this study are as follows : Through examining the relative errors of monthly predicted and actual generation data, monthly generation data showed big errors in winter season?. Except winter season, actual amount of generation and the predicted amount of generation showed no large errors.

• Journal of Electrochemical Science and Technology
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• 제13권3호
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• pp.323-338
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• 2022

Heat generation and temperature of a battery is usually presented by an equation of current. This means that we need to adopt time domain calculation to obtain thermal characteristics of the battery. To avoid the complicated calculations using time domain, 'state of charge (SOC)' can be used as an independent variable. A SOC based calculation method is elucidated through the comparison between the calculated results and experimental results together. Experiments are carried for rapid resistive discharge of a large-capacitive lithium secondary battery to evaluate variations of cell potential, current and temperature. Calculations are performed based on open-circuit cell potential (SOC,T), internal resistance (SOC,T) and entropy (SOC) with specific heat capacity.