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.

김남천 소설의 어휘 사용 양상에 대한 계량적 연구

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.

봉약침요법(蜂藥鍼療法)을 이용한 요골신경마비(橈骨神經麻痺) 치험(治驗) 3례(例)

김일환,위통순,김효수,Kim, Il-Hwan,Wei, Tung-Shuen,Kim, Hyo-Soo 대한약침학회 2004 Journal of pharmacopuncture Vol.7 No.2

Objective : The purpose of this study is to report the efficiency of Bee Venom Therapy by managering of radial nerve palsy patients. Method : Three patients were treatmented by Bee Venom therapy and acupucture therapy. And we took pictures of someone's wrist and checked the power of muscles by the improving phase. Results : Almost cases shows the improvement in the movement of wrist and the numbness of hand. By using acuputure and Bee Venom therapy, the symptoms of radial nerv palsy was more fastly recovered.

2012 한국정보법학회 정기 세미나 및 총회

김일환,구태언,황창근,이규홍(Kim Ilhwan,Gu Taeeon,Hwang Changgeun,Lee Kyuhong) 한국정보법학회 2012 한국정보법학회 정기세미나 발표자료 Vol.- No.12

개인정보보호에 관한 기본권 : 사생활관련 자유, 특히 개인정보자기결정권 헌법재판소는 “개인정보자기결정권은 자신에 관한 정보가 언제 누구에게 어느 범위까지 알려지고 또 이용되도록 할 것인지를 그 정보주체가 스스로 결정할 수 있는 권리이다. … ”1)고 하여 개인정보자기결정권의 보호범위와 헌법상 근거조항을 제시하였다.

Structure, Thermal Stability, and Mechanical Modulus of Polylactide Nanocomposites Reinforced with Organically Modified Layered Silicate

김일환,정영규,Kim, Il-Hwan,Jeong, Young Gyu The Korean Fiber Society 2012 한국섬유공학회지 Vol.49 No.4

We have manufactured polylactide (PLA) nanocomposites reinforced with layered silicates by the melt compounding method and have investigated their structure, thermal stability under oxygen or nitrogen atmosphere, and temperature-dependent mechanical modulus by adopting XRD, SEM, TGA, and DMA. Octadecylammonium-modified montmorillonite (organo-MMT) is used as an organically modified layered silicate and, for comparison, sodium montmorillonite (Na-MMT) is adopted as a purely inorganic layered silicate. X-ray diffraction patterns and SEM images confirm that the organo-MMT is intercalated and dispersed homogenously in the PLA matrix, whereas Na-MMT remains unchanged by forming agglomerated domains in the matrix. Unlike the PLA/Na-MMT nanocomposites, the thermal stability of PLA/organo-MMT nanocomposites is found to be substantially improved with the increment of organo-MMT content, especially under oxygen gas atmosphere. In addition, the mechanical modulus of PLA/organo-MMT nanocomposites in the glassy state are highly improved.

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.

축합인산염이 밥의 노화속도에 미치는 영향

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.

소음인(少陰人) 보중익기탕(補中益氣湯)과 보중익기탕(補中益氣湯)에 대한 사상의학적(四象醫學的) 비교(比較) 연구(硏究)

김일환,김경요,Kim, Ilwhan,Kim, kyungyo 사상체질의학회 1996 사상체질의학회지 Vol.8 No.2

The main purpose of this work is comparing the difference between Soumin Bojungyikgitang of constitutional medicine and Li Dongyuan's Bojungyikgitang Bojungyikgitang, the prescription originated from the Pi-Wei theory(脾胃論) of Li Dongyuan who was a medical man in the Jin Yuan dynasty, had been used widely for many kinds of disease caused by the singking of the qi of middle energizer due to the weakness of the spleen and stomach. But in the singking of the qi of middle energizer due to the weakness of the spleen and stomach. But in the end of Choseon dynasty Li Je Ma, the creator of the constitutional medicine, modified the Bojungyikgitang and applied to Soumin's disease. In this paper, the difference between the two prescription were investigated from the viewpoint of chinese herb pharmacology and purpose of prescription. Additionally the problems which could be brought out by applying Bojungyikgitang to the Soyangin and the Taeumin were studied. And the conclusion could be summarized as follows: 1. The prescription of the Li Dongyuan's Bojungyikgitang is based on the deficiency of vital energy due to internal damage and the Soumin Bojungyikgitang is useful to only a certain stage of progressing disease on the basis of Shanghanlun(傷寒論). 2. In the Li Dongyuan's Bojungyikgitang, Cimicifugae Rhizoma and Bupleuri Radix were used for emphasizing the ascending action and have the antipyretic action and the effect of elavating of yangqi as they are bitter in taste and cold in nature. 3. In the Soumin Bojungyikgitang, Pogostemonis Herba and Perillae Folium have the ascending-descending action and strengthen the stomach with the effect of mild sweating by pungent taste and warm nature. 4. The effect of elavating of yangqi in the Li Dongyuan's Bojungyikgitang offers the pathway where vital qi go up by eleminating the pathogenic fire with the action of Cimicifugae Rhizoma and Bupleuri Radix in the triple energizer and yangming muscular striae. On the other hand, the Soumin Bojungyikgitang depends on the effect of reinforcing qi and elavating yangqi by Astrgalli Radix entirely and supply vital qi by reinforcing yangqi with Ginseng Rsdix. 5. The exahausion of yin(亡陰證) in the Soyangin exterior syndrome and cold limbs(寒厥證) in Taeumin exterior syndrome are similar to the indication of Li Dongyuan's Bojungyikgitang. As the causes of the disease are fundamentally different in the view of constitutional medicine, the diseases could be aggravated by applying Li's Bojungyikgitang. These results suggest that Li Dongyuan's Bojungyikgitang is proper to the exterior syndrome of Soumin and Soumin Bojungyikgitang seems to be appropriate to the Soumin's disease.

"동의수세보원(東醫壽世保元)$\{lrcorner}$ 태음인(太陰人) 병증론(病證論)에 나타난 온병(溫病)의 내용과 청대(淸代) 온병학파(溫病學派)와의 비교(比較).고찰(考察)

김일환,김효수,Kim, Il-Hwan,Kim, Hyo-Soo 사상체질의학회 2003 사상체질의학회지 Vol.15 No.3

This paper was written in order to study the correlation of Taeumin's symptomatic phamacology to Chinese Febrile medicine. Through the symptoms and Clinical cases, treatments of the epidemic febrile disease in ${\ulcorner}Dongyi$ Suse $Bowon\{lrcorner}$ , the symptomatic phamacology for Taeumin was compared with chinese febrile medicine. The following conclusions were reached as a result of comparing the epidemic febrile disease in Taeumin with Chinese febrile medicine. 1. The concept of the epidemic febrile disease in Chinese febrile medicine is wider than that of the epidemic febrile disease in ${\ulcorner}Dongyi$ Suse $Bowon\{lrcorner}$ 2. The cause of the epidemic febrile disease in Chinese febrile medicine is fevershiness almost, but the So-byung(An Natural-Ordinary Disease) of Taeumin in ${\ulcorner}Dongyi$ Suse $Bowon\{lrcorner}$ is the basic method to diagnose the symptom of the epidemic febrile disease. 3. The So-byung of Taeumin in ${\ulcorner}Dongyi$ Suse $Bowon\{lrcorner}$ is divided into feverish symptom and cold symptom according to the so-byung. 4. In ${\ulcorner}Dongyi$ Suse $Bowon\{lrcorner}$, The method of a curative means is based on differing dimensions of the Visera and bowels, but Chinese Febrile Medicine has a equal curative means irrelevant to a patient's character.