• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2003.09a
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• pp.162-167
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• 2003

최근 수년간 유선 시뮬레이션은 연산 속도의 효율성과 수치 분산으로 인한 오차를 감소시킬 수 있는 장점으로 인해 많은 연구가 이루어졌으며 오염물의 거동을 모사 하는데 많이 사용되고 있다. 이 연구에서는 유선 시뮬레이션의 기법을 이용하여 1차의 비평형 흡착을 고려한 오염물 거동 수치 모사를 수행하였다. 1차의 비평형 흡착의 경우 흡착 계수에 따라 오염물의 이동 속도가 민감하게 반응하는 것을 확인할 수 있었고 흡착 계수의 값이 커질수록 오염의 전파 지연 효과가 크게 나타남을 알 수 있었다. 1차의 비평형 흡착의 경우에 평형 흡착과는 달리 오염이 진행되면서 오염물의 농도를 감소시키는 영향을 나타내었으며 이로 인하여 오염물이 더 이상 진행하지 못하는 제로라인을 형성하게 하였다. 이 제로라인은 흡착 계수의 값이 클수록 탈착 계수의 값이 작을수록 오염원에 가깝게 형성되었다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.603-613
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• 2021

As a core policy for achieving the goal of reducing greenhouse gas emissions in the building sector, Korea has enforced the mandatory certification of zero energy buildings for new public buildings from 2020. This study suggests energy-saving technologies and economic factors that building officials can refer to for decision-making on the implementation of zero energy buildings. For this study, the construction cost for the energy item of a building was analyzed by collecting the building energy efficiency level certification data and detailed construction cost statement data from public institutions for the last three years. Based on the building energy efficiency certification data, each energy item of the baseline building was derived, and the energy performance of the zero energy building was derived through repetitive simulations by gradually increasing the energy performance value of the baseline building. By applying the analyzed construction cost, the construction cost for each energy item of the baseline and zero energy buildings was derived. As a result, the lighting equipment contributed up to 10.5% energy savings, and the increase in construction cost of the cooling and heating system was at least 9.1%.

• 월간 기계설비
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• s.236
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• pp.48-51
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• 2010

국토해양부(장관 정종환)는 최근 연세대 친환경건축연구센터와 서울시 강동구가 협의('09.8)를 통해 친환경 공동주택 가이드라인을 마련함에 따라 강동구부터 '저에너지 친환경 공동주택 가이드라인' 시행에 들어 간다고 밝혔다. 가이드라인의 주요내용은 공동주택 재건축시 냉 난방 에너지 총 소비량의 40% 이상을 절감하고, 관리동 등 공용시설의 제로에너지화, 지역특성에 맞게 생태면적률 40%이상 확보, 단지내 인공생물 서식공간 조성의 의무화 등이다. 강동구는 앞으로 지어지는 재건축정비사업의 공동주택 모두에 가이드라인 내용을 반영하여 친환경 공동 주택으로 건설을 추진할 계획이며, 특히 고덕지구($1,239,407m^2$, 18,540가구) 및 둔촌지구($626,235m^2$, 9,090가구)부터 적용하여 친환경공동주택단지를 조성할 전망이다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.2
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• pp.407-413
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• 2015

In this paper, a DFPA(decimal floating-point adder) designed a pipeline structure that uses a LZA(leading zero anticipator) to reduce critical route to shorten delay to improve the speed of operation processing. The evaluation and verification of performance of proposed DFPA applied the Flowrian tool with simulation and Cyclone III FPGA was set as the target on the Quartus II tool for the synthesis. The proposed method compared and verified to proposed the other method using same input data. As a result, the performance of proposed method is improved 11.2% and 5.9% more than L.K.Wang's method and etc.. Also, it is confirmed that improvement of operation processing speed and reduction of the number of delay elements on critical path.

• Proceedings of the KIPE Conference
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• 2019.11a
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• pp.120-121
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• 2019

본 논문은 GaN 트랜지스터를 적용한 토템폴 PFC(Power Factor Correction)의 디지털 구현을 위한 방법을 제시한다. 특히, GaN 트랜지스터의 낮은 역회복 특성으로 토템폴 PFC의 연속 연속 모드 동작을 가능하게 한다. 토템폴 PFC는 고속 스위칭을 하는 레그를 GaN 트랜지스터를 사용하고, 라인 주파수로 스위칭 하는 레그는 일반적인 MOSFET을 사용하게 된다. 구조적으로 토템폴 PFC는 제로 크로싱에서 전류 스파이크 문제가 발생한다. GaN 트랜지스터는 전류 스파이크에 취약하기 때문에 최소화되어야 한다. 따라서, 본 논문은 디지털 구현에 있어 제로 크로싱에서 소프트 스타트 구현을 통해 이 문제를 최소화 하고, 모의실험을 통해 디지털 구현의 타당성을 입증하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.4
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• pp.221-227
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• 2013

In this paper, zero-energy house in order to monitor the energy savings come with Zigbee communication temperature humidity, smoke detection, illumination and CO2 to develop complex sensor board a protocol for handling about it dealt. In particular, indoor space to mount the sensor based on the location of the control algorithm, so it varies through the Zigbee wireless sensor mounting position is free, and the advantage of being able to change. Also, the energy loss that occurs through the window can be reduced to the room lighting can play an important role in the control system.

• Journal of the Korean Vacuum Society
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• v.16 no.2
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• pp.153-159
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• 2007

In-cryostat helium lines are under installation to transfer a cryogenic helium into cold components in KSTAR device. In KSTAR, three kinds of helium should be supplied into the cold components, which are supercritical helium Into superconduction(SC) magnet system, liquid helium into current lead system, and gas helium into thermal shields. Cryogenic helium lines consist of transfer lines outside the cryostat, in-cryostat helium lines, and electrical breaks. In-cryostat helium lines should be guaranteed of leak tightness for tong time operation at high internal helium pressure of 20 bar. We wrapped the helium line with multi-layer insulator(MLI) to reduce radiation heat and insulated the surface of the high potential part with prepreg tape. The electrical break was fabricated by brazing ceramic tube with stainless steel tube. To ensure the operation reliability at operation temperature, all the electrical break have been examined by the thermal cycle test at liquid nitrogen and by the hydraulic test at 30 bar. And additional surface insulation was prepared with prepreg tape to give structural safety. At present most of the in-cryostat helium lines have been installed and the final inspection test is progressing.

• Journal of Digital Convergence
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• v.20 no.5
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• pp.99-105
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• 2022

In China, with the rise of third-party payments such as WeChat Pay and Alipay, the traditional business of banks has been greatly affected. Banks can encourage and expand QR code payments to merchants. Therefore, it is meaningful to analyze and study the QR code work of banks. The purpose of this study is to analyze the effect of the execution of the zero-rate of the comprehensive payment QR code combined with the payment cycle and Funds Transfer Pricing (FTP) on commercial banks in China. Based on the manually collected customer data of Chinese commercial banks, this paper conducts a case analysis combined with the calculation method of financial indicators. As a result of the study, it was found that commercial banks need to continue to implement the policy as the advantages of introducing the integrated QR code fee rate 0 policy are greater than the disadvantages. This paper provides feasible suggestions on how to quickly occupy the offline payment market for commercial banks, which has guiding significance for commercial banks' marketing decisions. Presently, there are few studies on the zero-rate subsidy policy implemented by Chinese commercial banks.

• Journal of Digital Convergence
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• v.19 no.9
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• pp.189-199
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• 2021

In order to increase the self-reliance rate of new and renewable energy in order to respond to the mandatory domestic zero-energy buildings, the taller the building, the more limited the site area, and installing PV modules on the roof is not enough. Therefore, BIPV (Building integrated photovoltaic, hereinafter BIPV) is the industry receiving the most attention as a core energy source that can realize zero-energy buildings. Therefore, this study conducted a survey on the problems of the BIPV industry in a self-discussing method for experts with more than 10 years of experience of designers, builders, product manufacturers, and maintainers in order to suggest the right direction and revitalize the BIPV industry. Industrial problems of BIPV adjustment are drawn extention range of standard and certification for products, range improvement for current small condition of various kind productions, need to revise standards for capable of accomodating roof-type, color-module and louver-module, necessary of barrier in flow of foreign modules into korea through domestic certification mandatory, difficulty in obtaining BIPV information, request to prevent confusion among participants by exact guidelime about architectural application part of BIPV, and lack of the BIPV definition clearness, support policy, etc. Based on the improvements needed for the elements, giving change and competitiveness impacts aims to present and propose counter measures and direction.

• Elastomers and Composites
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• v.46 no.3
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• pp.251-256
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• 2011

Effect of poly(propylene-co-octene) as a compatibilizer in toughened polypropylene/ poly(ethylene-co-octene) (EOC) was investigated. The EOCs used were metallocene catalyzed commercial linear low density polyethylene and they are elastomeric materials. The poly(propylene-co-octene) was synthesized by metallocene catalyst in our laboratory to be used as a compatibilizer in PP/EOC blends. PP/EOC blends without compatibilizer shows very low mechanical properties in specimens with weldlines while incorporation of a compatibilizer significantly increases the mechanical properties of specimens with weldlines. However, compatibilized PP/EOC blends does not show increased impact property in a weldline free specimen and it is attributed to low molecular weight of the poly(propylene-co-octene) synthesized in present study. It is expected that the poly(propylene-co-octene) having increased molecular weight provides very good performance as an effective compatibilizer in toughened polypropylene/EOC blends.