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Back to bock 컨버터를 갖는 가변속 풍력터빈 시스템의 모델링과 해석
김일환,강경보,김재홍,문상호,오성보,김세호,Kim, Eel-Hwan,Kang, Keong-Bo,Kim, Jae-Hong,Moon, Sang-Ho,Oh, Sung-Bo,Kim, Se-Ho 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.8
본 논문에서는 이중여자 유도발전기의 회전자에 back to back 컨버터가 채용된 가변속 풍력터빈 시스템의 모델링과 해석을 나타내었다. 제어시스템의 특성을 파악하기 위해서 시뮬레이션에서는 Psim 프로그램을 사용하여 660[kW] 의 출력정격을 갖는 시스템을 모델로 하였다. 모델링에서는 블레이드 제어 시스템 모델과 회전자와 계통선에 연결된 컨버터 시스템을 모델링 하였다. 풍속의 변화에 따라 원하는 출력을 얻을 수 있도록 피치각을 제어하여 정격풍속 이하에서도 최대출력이 발생하도록 하였고, 정격풍속 이상에서는 회전자 속도를 일정하게 하여 정격출력을 유지할 수 있도록 하였다. 또한 무효전력을 제어하여 출력의 역률을 제어하였다. 제안한 해석방법의 타당성을 검증하기 위하여 풍속변화에 따른 모델 시스템의 시뮬레이션 결과 값들과 제주행원 풍력발전 단지에서 운용되고 있는 V47 660[kW] 시스템의 실측 결과들과 서로 비교 검증하여 제안한 해석 방법의 타당성을 입증하였다. This paper presents the simulation modeling and analysis of variable wind speed turbine system(VWTS) using the doubly fed induction generator(DFIG) connected the back to back converter system in the rotor side. In the simulation, using the model system which has the 660[kW] rated power, blade control and the dual converter system are modeled for verifying the control characteristics. The VWTS is controlled by the optimal pitch angle for maximum output power under the rated wind speed, and for the rated output power over the rated wind speed. And also power factor is controlled by the reactive power. To verify the effectiveness of the proposed method, simulation results are compared with the actual data from the V47 VWTS located in Hangwon wind farm in Jeju-Do. According to the comparison of these results, this method shows excellent performance.
Chlamydophila psittaci에 감염된 앵무새의 임상병리학적 특징과 원인균의 ompA 유전자 비교분석
김일환,장진욱,이수형,김대용,성원진,권혁준,김재홍,Kim, Il-Hwan,Jang, Jin-Wook,Lee, Su-Hyung,Kim, Dae-Yong,Seong, Won-Jin,Kwon, Hyuk-Joon,Kim, Jae-Hong 대한수의학회 2012 大韓獸醫學會誌 Vol.52 No.3
Avian chlamydiosis is caused by Chlamydophila psittaci and considered as one of an important zoonotic disease throughout the world. Among more than 400 avian species including poultry and pet birds susceptible to the disease, psittacine birds were known to be mostly susceptible hosts. In Korea, no outbreak of the disease and genetic analysis of the agent in poultry and pet birds have been reported. With histopathological findings and genetic identification of a causative agent, avian chlamydiosis was identified in parrots submitted from the same pet bird farm in 2006 and 2009 for the diagnosis. Based on genetic sequences and phylogenetic analysis of ompA gene, the two isolates of Chlamydophila psittaci showed 100% of genetic similarity and belonged to genotype A, suggesting that the same agent might be continuously circulated in the farm. This result indicates that serological survey of the disease in pet bird farms and impact of the disease on significance in public health may be further studied.
문한별(Han Byoul Moon),김일환(Il Hwan Kim) 한국현대소설학회 2011 현대소설연구 Vol.- No.48
This paper aims to investigate characteristics of use of lexical items in Kim, Namcheon`s novels based on quantitative and statistical approach. It is well known that trends of Kim`s novel have seriously changed after KAPF was dismissed. However there are few researches how this kind of changes can be affected in his novels concretely. It is expected that quantitative approaches on Kim`s novels are able to overcome this kinds of limit. Especially in this paper, in order to analyze his novels, first, we developed his 17 representative novels to raw corpus, and then annotated linguistic information, part-of-speech to the corpus. From the annotated corpus, we can get the frequencies of words(nouns) by works and part-of-speeches. However even most frequent words in the text are not always meaningful to analyze the text. So statistical verification as a t-score must be applied in the process of extracting keywords. As a result we are able to find some keywords in 17 texts explicitly and trends of Kim`s novels are explained by year and work in a successful way.
Center-gated 디스크에 대한 사출/압축 성형공정의 수치적 모델링-압축성을 고려한 점탄성유체 모델의 사출성형-
김일환,박성진,정성택,권태현,Kim, Ilhwan,Park, Seong-Jin,Chung, Seong-Taek,Kwon, Tai-Hun 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.2
The present study attempted to numerically simulate the process in detail by developing an appropriate physical modeling and the corresponding numerical analysis for precision injection and injection/compression molding process of center-gated disk. In part I, a physical modeling and associated numerical analysis of injection molding with a compressible viscoelastic fluid model are presented. In the distribution of birefringence, the packing procedure results in the inner peaks in addition to the outer peaks near the mold surface, and values of the inner peaks increase with the packing time. Also, values of the density in the core region increase with the packing time. From the numerical results, we also found that birefringence becomes smaller as the melt temperature gets higher and that it is insignificantly affected by the flow rate and the mold temperature. As far as the density distribution is concerned, mold temperature affected the distribution of density especially near the wall. But it was not significantly affected by flow rate and melt temperature. Numerical results of birefringence coincided with experimental data qualitatively but didn't quantitatively.
난알부민 유도 알레르기 비염 마우스에 대한 소청룡탕(小靑龍湯)의 효능 실험연구
김일환,구진모,허한솔,나창혁,장보형,신용철,고성규,Kim, Ilhwan,Ku, Jinmo,Hur, Hansol,Na, Changhyeok,Jang, Bo-Hyoung,Shin, Yong-Cheol,Ko, Seong-Gyu 대한예방한의학회 2014 대한예방한의학회지 Vol.18 No.3
Objective : Allergic rhinitis (AR) is an allergic inflammation of the nasal airways. Socheongryong-Tang traditionally has been used in Korea for treatment of allergy diseases. In the present study, we investigated whether SCRT suppresses the progression of AR in vivo and in vitro. Method : In this study, we investigated the effect of oral administration of SCRT on the Ovalbumin(OVA)-induced allergic rhinitis mouse models. Additionally, to find a possible explanation for the anti-inflammation effects of SCRT, we evaluated the inflammatory cytokine levels in LPS-stimulated mouse inflammation cell (RAW264.7) and mouse splenocyte. Results : The finding of this study demonstrated that SCRT reduced mast cells and inflammation cells infiltration in OVA-induced nasal cavity. Additionally, SCRT inhibited the production of inflammatory cytokines in splenocyte. However SCRT don't inhibited the production of inflammatory cytokines in RAW264.7 cells. Conclusion : Taken together, our results showed that oral administration of SCRT beneficial effects in allergic rhinitis, suggesting that SCRT might be a useful candidate for the treatment of allergic rhinitis.
수근관 증후군(carpal tunnel syndrome) 5례에 대한 증례 보고
김일환,Kim, Il-Hwan 대한약침학회 2001 Journal of pharmacopuncture Vol.4 No.3
Objective: The purpose of the study was to evaluate the effectiveness of treating the carpal tunnel syndrome by using both the Herbal Acupuncture and herbal medicine therapy on five cases. Methods: For the Herbal Acupuncture, Jungseonguhhyul No. 1 and Hwanglyunhaedoktang were used. For the herbal medicine, Dangguihwalhyul-tang was used. The patients were treated once in every two days; the result was evaluated after ten treatments. Patients' conditions were monitored through their testimony, phalen's test, nerve conduction study and electromyography. Results: In all five cases, the patients showed improvement; in four cases, the patients no longer had most of the clinical symptoms. Based on the result of the nerve conduction study, for the four cases in which the patients no longer displayed most of the clinical symptoms, their nerve conduction rate improved; for the remaining one case, the patient's nerve conduction rate deteriorated. Conclusions: The results of this study demonstrate that combining the Herbal Acupuncture and herbal medicine therapy can have noticeable effects in treating the carpal tunnel syndrome; developing more variety of the herbal acupuncture would lead to even better treatment results.
진한가열증(眞寒假熱證)을 보인 소음인(少陰人) 망양증(亡陽證) 환자(患者) 치험(治驗) 1례(例)
김일환,박혜선,이상민,김효수,Kim, Il-Hwan,Park, Hye-Sun,Lee, Sang-Min,Kim, Hyo-Soo 사상체질의학회 2005 사상체질의학회지 Vol.17 No.3
1. Objectives This case is aimed to verify the relation of Soeurnin Mang-yang Syndrome and Cold Syndrome with pseudo-heat syndrome. 2. Methods The patient has high fever, general body sweating, thirst and constipitation is diagnosed as Soeumin Mang-yang Syndrome. Mang-yang Syndrome one of the symptoms in the Exterior Febrile Disease induced from the Kidney affected by Heat in Soeumin(少陰人) marked by spontaneous sweating and fever with chills. This syndrome is similar to Cold syndrome with pseudo-heat symptoms in general symptoms and pathologic process. Therefore, We medicate Doksampalmul-tang to this patient who diagnosed as Soeumin Mang-yang Syndrome. 3. Results and Conclusions The symptoms that the patient has fever, sweating, thirst and constipitation are solved after the medication. This means recovery of Yang-Energy in Kidney and the spleen.
김일환,이규환,김성곤,Kim, Il-Hwan,Lee, Kyu-Han,Kim, Sung-Kon 한국식품과학회 1985 한국식품과학회지 Vol.17 No.4
축합인산염 (57% $P_2O_5$함량)을 맵쌀(아끼바레 및 밀양30호)과 찹쌀(올찰)에 0.3%(w/w)첨가하고, 밥의 노화속도에 미치는 영향을 조사하였다. 아끼바레 및 밀양30호의 경우 시간상수(노화속도 상수의 역수)는 인산염의 첨가시 각각 1.22 및 1.53배 증가하였으며, 찹쌀밥의 경우에는 변화가 없었다. 인산염은 밥의 저장중 노화될 수 있는 물질의 양을 감소시켰으며, 인산염의 첨가시 아끼바레 및 밀양30호 찰밥은 대조구에 비하여 각각 86.6% 및 73%가 노화되었다. The effect of a polyphosphate having $P_2O_5$ content of 67% on the firming rate of nonwaxy (Akibare and Milyang 30) and waxy cooked rice stored at room temperature was investigated. The phosphate retarded the firming rate of Akibare and Milyang 30 by 14.0 and 27:00, respectively. The phosphate reduced the starch components available for crystallization of cooked nonwaxy rice. The phosphate exerted no effect on the firming rate of cooked waxy rice.