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태양광 발전의 전기차 사용 후 배터리 적용을 위한 ESS의 최적 용량 및 배터리 최대 가격 산정
채상헌(Sang Heon Chae),김일환(Eel-Hwan Kim) 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.11
Jeju Island, Republic of Korea, is the most active region for electric vehicles and renewable energy sources. However, in Jeju Island, the problems of wasted batteries from electric vehicles and the curtailment of renewable energy output already appeared. To solve this problem, there is a method to install and operate SLB(Second life battery from electric vehicle) with solar power generation. From this perspective, this paper proposes the optimal capacity calculation and maximum price calculation methods for ESS(Energy storage system) based SLB applied to solar power generation. The optimal capacity and maximum price of the SLB are derived based on the capacity and price of the new ESS. The proposed method was simulated based on the weather data actually measured in the Jeju area using the MATLAB program. As a result of the simulation, the optimal capacity of SLB was calculated as 389kWh for 200kW PV farm. To Install calculated SLB, 354SLB modules were required and its maximum price was decided as 132,000KRW.
폐기물 가스화 합성가스의 고온수성가스전이반응을 위한 Fe/Al/Cu 촉매의 제조방법에 따른 활성 비교 연구
김지은 ( Jee Eun Kim ),채상헌 ( Sang Heon Chae ),전경원 ( Kyung-won Jeon ),윤조희 ( Cho-hee Yoon ),류재용 ( Jae-yong Ryu ),장원준 ( Won-jun Jang ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 추계학술발표논문집 Vol.2019 No.-
폐기물 가스화 합성가스로부터 수소를 생산하기 위해 다양한 제조방법으로 Fe/Al/Cu 촉매를 제조하고 고온수성가스전이반응에 적용하였다. Fe/Al/Cu 촉매는 함침법, 졸겔법, 그리고 공침법으로 제조되었다. 제조된 촉매 중 공침법으로 제조된 Fe/Al/Cu 촉매가 450 ℃에서 85% 이상의 높은 CO 전환율 및 안정성을 나타내었다. 공침법으로 제조된 Fe/Al/Cu 촉매의 뛰어난 성능은 높은 표면적, 작은 Fe<sub>3</sub>O<sub>4</sub> 결정 크기, 강한 산화환원능, 그리고 많은 Cu<sup>0</sup>에 기인한 결과이다.
Analysis of Pulse Width Modulation Schemes for Electric Vehicle Power Converters
Ngoc-Thinh Quach,Sang Heon Chae(채상헌),Eel-Hwan Kim(김일환),Seung-Yong Yang(양승용),Chang-Jin Boo(부창진),Ho-Chan Kim(김호찬) 대한전기학회 2016 전기학회논문지 Vol.65 No.12
In order to overcome the problem of fossil fuel energy, electric vehicle (EV) has been used in recent years. The important issues of EV are driving distance and lifetime related to EV efficiency. A voltage source converter is one of the main components of EV which can be operated with various pulse width modulation (PWM) schemes such as continuous PWM schemes and discontinuous PWM schemes. These PWM schemes will cause the effects on the efficiency of converter system and the lifetime of EV. Therefore, this paper proposes an analysis of the PWM schemes for the power converter on the EV. The objective is to find out a best solution for the EV by comparing the total harmonic distortion (THD) and transient response between the various PWM schemes. The operation of traction motor on the EV with the PWM schemes will be verified by using Psim simulation program.
퇴비 및 화학비료가 무경운 귀리의 사초수량과 품질에 미치는 영향
김종덕(Jong Duk Kim),김수곤(Su Gon Kim),채상헌(Sang Heon Chae),권찬호(Chan Ho Kwon) 한국초지조사료학회 2006 한국초지조사료학회지 Vol.26 No.3
This experiment was conducted to evaluate the effect of manure and chemical fertilizer on the forage yield and quality of oat at no-tillage. The experimental design was a randomized complete block design. The three treatments were: chemical fertilizer, manure fertilizer, and chemical and manure mixture. Seedling vigor was higher at chemical fertilizer than manure, but more greener at manure application than chemical fertilizer. Dry matter (DM) content of oat at manure was higher than chemical and mixture fertilizer (p〈0.05). There was no difference in DM yield, TDN (total digestible nutrients) yield, and CP (crude protein) yield of oat at no-tillage system, but the fresh yield was significantly higher in chemical fertilizer compared to manure. The CP content for oat was significantly higher in manure than chemical fertilizer. However, no significant effects were observed for NDF (neutral detergent fiber), ADF (acid detergent fiber), TDN and RFV (relative feed value) in different fertilizer application. Based on the results of this study, manure don"t affected forage production and quality of no-till oat except CP content because forage oat is used off-season crop.
Priming 약제의 종류와 농도가 목초종자의 발아에 미치는 영향
김종덕(Jong Duk Kim),권찬호(Chan Ho Kwon),채상헌(Sang Heon Chae),허삼남(Sam Nam Hur),김종근(Jong Geun Kim) 한국초지조사료학회 2006 한국초지조사료학회지 Vol.26 No.4
종자의 priming은 유식물의 초기 정착에 중요한 기술 중의 하나이다. 따라서 본 시험에서는 목초의 주요 초종인 톨 페스큐, 오처드그라스, 알팔파 및 화이트 클로버의 발아율 향상과 균일도 증가를 위하여 priming 약제의 종류와 농도를 달리하여 발아율을 조사하였다. 본 시험은 분할구 배치법으로 주구는 KNO₃, KH₂PO₄, K₃PO₄, Ca(NO₃)₂ 및 PEG 약제를, 세구는 50 mM(또는 10%), 100 mM(또는 20%) 및 200 mM(또는 30%)의 약제농도를 두었다. Priming 목초의 발아율은 약제의 종류 및 농도에 따라 다르게 나타났다. 화본과 목초인 톨 페스큐는 Ca(NO₃)₂와 K₃PO₄가 다른 약제보다 발아율이 높았으며, 오처드그라스는 약제간에 차이가 없었으나 KH₂PO₄가 다른 약제보다 발아율이 높았다. 한편 두과목초인 알팔파와 화이트 클로버는 모두 PEG에서 높은 발아율을 나타내었다. 한편 약제의 농도는 약제의 종류에 따라 달랐다. 이상의 결과를 종합해 보면 목초의 priming은 초종에 따라 적정 약제종류와 농도가 달랐다. Seed priming is a useful technique for early establishment of seedling. In this experiment, the conditions for priming of pasture seeds (tall fescue, orchardgrass, alfalfa and white clover) have been optimized to ensure an early germination and more uniform growth of seedlings. The experiment was conducted in a split plot design with three replications. The main plots consisted of five different materials such as KNO₃, KH₂PO₄, K₃PO₄, Ca(NO₃)₂ and PEG. The subplots were consisted of three chemical concentration groups such as 50mM (or 10%), 100mM (or 20%) and 200mM (or 30%). Effect of priming materials and its concentrations were different in all four pasture seeds examined. Chemical concentration did not show any significant effects on the germination of tall fescue, however, germination of tall fescue primed with Ca(NO3)2 and K3PO4 materials were higher than the others. The concentration of prime materials did not affect on the germination of orchardgrass, but germination of orchardgrass primed with KH2PO4 was showed better result than the other materials examined. The seeds of alfalfa and white clover primed with PEG showed better germination capability than the other priming materials. In addition, chemical concentration of primed seeds also showed significant difference on the germination of alfalfa and white clover. These results suggest that seed priming induced earlier and higher germination for all four pastures tested. However, the degree of priming effectiveness on pasture species depending on the priming materials and its concentrations.
겉뿌림을 위한 오차드그라스와 톨페스큐 종자의 코팅 및 펠렛팅 기술 비교
김종덕(Jong Duk Kim),권찬호(Chan Ho Kwon),채상헌(Sang Heon Chae),김종관(Jong Kwan Kim),김병완(Byong Wan Kim),서성(Sung Seo) 한국초지조사료학회 2007 한국초지조사료학회지 Vol.27 No.4
초지조성과 개량에서 겉뿌림은 중요한 방법중의 하나이다. 오늘날 겉뿌림 초지조성에서 종자피복기술은 관심이 높아지고 있다. 따라서 본 시험은 산지초지에서 겉뿌림조성시 목초의 출현율과 정착율을 높이기 위해 화본과목초종자의 피복기술을 개발하기 위하여 실시하였다. 종자 펠렛팅은 피복시간을 단축하고 단위시간당 피복량을 증가시킴으로서 종자피복의 새로운 기술로 평가되었다. 펠렛종자의 건조시간을 단축하고 건조온도를 낮춤으로서 화본과 목초종자의 발아세와 발아율이 증가하였다. 임간초지에서 펠렛종자는 종자의 출현, 정착 및 초기 생육을 향상시켰다. 이상의 시험결과를 볼 때 임간초지에서 종자 펠렛팅 기술은 화본과목초의 정착과 초기생육 향상을 위한 새로운 기술로 평가되었다. Surface sowing method is one of the important methods to establish seeds in mountainous area. Seedcoating technique in the surface sowing method is increasing interest in the world today. An experiment was conducted to develope a technique for pelleting seeds of grass in woodland. Results showed that the seed pelleting was a useful technique than coating seeds because the pelleting reduced coating time and increased amounts of coated seeds per hour. As lowering temperature and reducing time for drying, germinating energy and germination rate of pelleted seeds were improved. And emergence, establishment and early growth of pelleted were also improved in pasture under woodland. Based on this study, we could conclude that the seed pelleting is a useful technique for the establishment and early growth of grass under woodland.