계통-연계형 태양광발전시스템을 위한 이산형 적분 슬라이딩 모드 제어기 설계

이진국,김일송 忠州大學校 2009 한국교통대학교 논문집 Vol.44 No.-

The merit of the proposed controller is the tight control of the inductor current. Using the integral sliding surface the reaching phase which causes current overshoot during transient period can be eliminated. The proposed controller can avoid current overshoot and make optimal design for the system performance. The structure of the proposed controller is simple, but it shows robust tracking property against modeling uncertainities and parameter variations. The performance of the proposed system has been proved by the simulation and experimental results.

소아 흉통의 원인질환에 따른 임상양상

장국찬,김은영,노영일,양은석,문경래,박영봉 朝鮮大學校 附設 醫學硏究所 2008 The Medical Journal of Chosun University Vol.33 No.2

목적: 소아에서의 흉통은 흔히 접하게 되며 일반적으로 좋은 경과를 보인다. 가장 흔한 원인으로 특발성, 골격계이상, 위장관계 질환 등이 다양하게 언급되고 있으며 감별진단이 쉽지 않아 여러 검사를 시행하게 된다. 자세한 병력청취와 진찰이 진단에 가장 중요하다고 하지만 통계적 의의를 보고한 바는 드물다. 이에 흉통 원인을 분류하고 각각의 임상양상을 파악하여, 병력 청취와 진찰소견의 감별진단에 대한 유용성과 시행 검사들의 의의를 알아보고자 하였다. 방법: 2004년 3월 부터 2007년 8월 까지 조선대학교 병원 소아청소년과에 흉통을 주소로 방문한 환아 77명을 대상으로 하였다. 연령, 성별, 흉통의 위치, 지속시간, 양상, 빈도, 방문까지 걸린 시간, 동반증상, 유발인자의 각 항목과 원인 질환과의 관련성을 분석하였다. 흉부방사선, 심전도, 심초음파, 24시간 Holter, 운동부하 심전도, 상부 위장관 조영술, 24시간 pH 검사, 위내시경, 심근효소를 검사 하였다. 결과: 평균 나이는 10.2±2.8세로 6세에서 11세까지가 48명(62.3%)으로 가장 많은 분포를 보였고 남아 42명(54.5%), 여아 35명(45.5%)이었다. 흉통의 위치는 좌측이 32명(41.6%), 양상은 콕콕 찌르는 것이 27명(35.1%)으로 가장 많았고 지속시간은 1분미만이 36명(46.8%), 1-5분 사이가 28명(36.4%)으로 대부분 5분 미만이었다. 흉통 원인은 특발성이 27례(35.1%)로 가장 많았고, 위장관 질환 23례(29.9%), 늑골 연골염 12례(15.6%), 심혈관 질환 7례(9.1%), 정신신체화 질환 6례(7.8%), 폐질환 2례(2.6%)였다. 여아에서 연령이 높을수록 정신신체화 질환의 빈도가 높았다(P= 0.046). 흉골 하부 통증을 호소한 17명 중 13명(76.5%)이 위장관 질환으로 통계적으로 유의하였다(P= 0.023). 정신 신체화 질환은 6명에서, 위장관 질환도 20명(86.9%)에서 흉통지속시간이 5분 미만이었으나 통계적 의의는 없었다. 흉통 양상 중 타는 듯한 양상을 호소한 7명중 6명에서 위장관 질환이 원인이었으나 통계적 의의는 없었다. 선택 시행 검사 중 심초음파는 32명중 3례(9.4%), 24시간 Holter 검사는 13명중 5례(35.7%), 24시간 pH 검사는 28명 중 16례(57.1%)에서 이상소견을 보였다. 결론: 소아 흉통 환자 중 연령이 높은 여아에서는 정신 신체화 장애를, 흉골 하부 통증을 호소한 경우는 위장관 질환을 먼저 생각하는 것이 좋다고 판단된다. 흉통원인으로 위장관 질환의 빈도가 높고 시행검사들의 진단율을 볼때, 소아 흉통 환아 에서는 상부 위장관 조영술 등 위장관 질환의 검사를 기본적으로 시행하는 것이 좋을 것으로 생각된다. Purpose: Chest pain in children is usually benign. Chest pain in children results from a wide variety of causes. Differential diagnosis of causes is not easy and then many diagnostic approach is trying. Careful history and physical exams must guide the assessment of children with chest pain. The purpose of this study intends to evaluate children with chest pain and usefulness of careful history, physical examination and several diagnostic examinations. Methods: From March 2004 to August 2007, 77 patients presented with chest pain were enrolled. we evaluated age, sex, characteristics of chest pain (location, duration, description, frequency), accompanying symptoms, increasing reasons and relationship with cause of chest pain. Chest x-ray and ECG were checked in all patients. Cardiologic and gastrointestinal evaluations were checked when considered necessary. Results: The male and female ratio was 0.55:0.45, mean age 10.2 ± 2.8 year. Common ages of chest pain were 10 to 12 years old (38case, 49.3%). The location was on the left precordium in 32cases (41.6%) of the patients. The most common diagnostic findings of chest pain were idiopathic(27cases, 35.1%), gastrointestinal disorder (23cases, 29.9%), costo chondritis (12cases, 15.6%), cardiovascular disorder (7cases, 9.1%), psychosomatic disorder(6cases, 7.8%) and pulmonary disorder (2cases, 2.6%). Older children in female were more likely to have a psychosomatic cause (P= 0.046). The patients complained chest pain on substernal area were 17cases and 13cases (76.5%) were diagnosed as gastrointestinal disorder (P= 0.023). Positive findings of echocardio graphy, 24hr Holter ECG and 24hr pH monitoring were present in 3 (9.4%), 5 (35.7%) and 16 (57.1%) of the patients respectively. Conclusion: Gastrointestinal disorders are common causes and positive diagnostic rate of gastrointestinal evaluation is relatively high in children with chest pain. Old girls are more likely to have a psychosomatic disorder and substernal pain is the reliable sign to be considered as a gastrointestinal disease in children with chest pain. Hence, Diagnostic approach of gastrointestinal disease such as upper GI should be performed basically in mostly children with chest pain.

신손상 진단에 있어 현미경적 혈뇨의 의의

임정환,오봉렬,나국주,김현수,윤한덕,허 탁,조석주,민용일 大韓應急醫學會 1996 대한응급의학회지 Vol.7 No.1

The evaluation of patients with microscopic hematuria after blunt abdominal trauma has become controversial. We tested the hypothesis that renal contusion can be diagnosed clinically and that these patients do not require radiographic evaluation. To evaluate the association of microscopic hematuria without shock and with renal injury, we reviewed the medical records of 252 patients following blunt abdominal trauma. Microscopic hematuria without shock was noted in 58 of 252 patients. Of the 58 patients 52 had renal contusion, 4 had renal laceration, 1 had a renal rupture and 1 had renal pedicle injury. All of the patients with renal contusions experienced no complications from nonoperative management. But, avoiding a radiopraphic evaluation in patients with blunt renal trauma plus microscopic hematuria and no shock would miss a few cases of severe renal injury.

장출혈을 초래한 유전분증 1 예

김병호,김효종,정인경,장린,이정일,동석호,장영운,김광국,황일섭,김윤화 대한소화기내시경학회 1999 Clinical Endoscopy Vol.19 No.1

Although intestinal bleeding is known to occur in amyloidosis, it is rare as a presenting symptom or sole manifestation of the disease. We experienced a case of intestinal hemor-rhage in a 64-year old female patient with primary amyloidosis, kappa type. Antral muco-sal erosions were discovered and one shallow healing ulcer at the angle. Colonoscopy revealed multiple purplish nodules in the sigmoid colon and descending colon, as well as a large shallow ulcer with blood clots in the sigmoid colon which was suspected to be the intestinal hemorrhage site. Endoscopic biopsy established amyloidosis. Polarizing microscopy after Congo red staining and immunohistochemical staining identified primary amyloid, kappa type. A case of intestinal hemorrhage in patients with primary amyloidosis is presented and the literature is reviewed.

Fatigue and Structural Performance Evaluation of Fast-Drying Ultra-High Strength Grout Material

Kim, Hyeong-Gook,Kim, Min-Jun,Park, Hun-Il,Kim, Kil-Hee Informa UK (TaylorFrancis) 2017 JOURNAL OF ASIAN ARCHITECTURE AND BUILDING ENGINEE Vol.16 No.1

A Note on Completion of Topological Vector Space through the Minimal Cauchy Filter

Kim,Sung Il,Kim,Hyeon Gook 중앙대학교 기술과학연구소 1985 기술과학연구소 논문집 Vol.15 No.-

Cantor는 비완비인 유리수의 집합 Q에서 완비된 실수의 집합 R을 얻었다. 또한 Hausdorff는 이러한 성질을 확장하여 완비가 아닌 거리 공간으로부터 완비인 거리 공간을 얻었다. 그 이후 여러 공간의 완비성이 연구되어 왔다. 이 논문은 위상적 벡터공간을 완비화하는데 Minimal Cauchy filter를 이용하여 Cantor의 방법에 따라 추론한 결과이다.

Foliar Applications of Urea and a Potent Growth Regulator Ameliorate Calyx-end Cracking in Persimmon

Jin Gook Kim,Sowbiya Muneer,Mi Hee Shin,Dong Il Kwang,ByulHaNa Lee,Kwang-Sik Cho,Dong Won Bae,Yun Hee Kim 한국원예학회 2017 원예과학기술지 Vol.35 No.5

Persimmon (Diospyros kaki ‘Fuyu’) trees were sprayed with 10 mg·L-1 of CPPU [N-(2-chloro-4-pyridyl)-N′-phenylurea] or 1% urea at blooming to determine whether application of these substances would reduce the incidence of calyx-end cracking. Calyx-end cracking decreased with the application of both CPPU and urea. Changes in physiological parameters (length, weight, and height of calyxes, number of seeds, fruit firmness, and soluble solids content) were investigated in response to CPPU and urea. The length and width of the calyx were greatest in CPPU-treated fruits, and the width of the long or short side of the fruit was greatest in urea-treated fruits. Additionally, phytohormones (indole-3-acetic acid, IAA; gibberellic acid, GA3; zeatin; 2-cis -trans-abscisic acid, ABA; jasmonic acid, JA; and salicylic acid, SA) were analyzed to elucidate the relationship between fruit enlargement and calyx development. CPPU significantly increased levels of GA3 and IAA, while ABA levels decreased in the calyx in all treatments. No significant changes were seen in JA or SA levels. Finally, analysis of anatomical structure showed that CPPU and urea are important in maintaining fruit firmness. Our combined physiological, phytohormonal, and anatomical analysis revealed that CPPU and urea both ameliorate calyx-end cracking in persimmons, and suggests that CPPU and urea may be used to reduce physiological injury in persimmon fruits.

특별강연(特別講演) 및 학술연구(學術硏究) 발표요지(發表要旨) : 제1분야: 잡초방제 ; 올방개, 물달개비의 후기 방제와 벼 약해

임일빈 ( Il Bin Im ),권오도 ( Oh Do Kwon ),강종국 ( Jong Gook Kang ),김선 ( Sun Kim ),김재덕 ( Je Duck Kim ),김기홍 ( Ki Hong Kim ) 한국잡초학회 2004 한국잡초학회 별책(학술대회 초록집) Vol.24 No.1

A study on the removal of cesium from field soil by grinding and hydrothermal method

Sung Man KIM,Il-Gook KIM,Jun-Hyun KIM,So-JIn PARK,In-Ho YOON 대한환경공학회 2019 대한환경공학회 학술발표논문집 Vol.2019 No.-

Enhancement of Memory Performance Using Doubly Stacked Si-Nanocrystal Floating Gates Prepared by Ion Beam Sputtering in UHV

Han, Kyu Il,Park, Yong Min,Kim, Sung,Choi, Suk-Ho,Kim, Kyung Joong,Park, Il Han,Park, Byung-Gook Institute of Electrical and Electronics Engineers 2007 IEEE transactions on electron devices Vol.54 No.2

<P>Structures of SiO<SUB>2</SUB>/SiO<SUB>x</SUB>/SiO<SUB>2</SUB> and SiO<SUB>2</SUB>/SiO<SUB>x</SUB>/SiO<SUB>2</SUB>/SiO<SUB>x</SUB>/SiO <SUB>2</SUB> have been prepared on Si wafers by ion beam sputtering deposition in ultrahigh vacuum (UHV) and subsequently annealed to form single-layer and doubly stacked Si nanocrystals (NCs). Using these two structures, nonvolatile Si-NC floating-gate nMOSFETs were fabricated at x=1.6 following 1.5-mum CMOS standard procedures. The Fowler-Nordheim tunneling of the electrons through the tunnel oxide, their storage into NCs, retention, and endurance are all investigated by varying the device structure and the thicknesses of the NC and oxide layers. It is shown that charge-retention time is longer, and program/erase (P/E) speeds are faster in doubly stacked devices than in single-layer devices, which seem to result from the optimization of device structure, the exclusion of unwanted defects due to the nature of UHV, and the suppression of charge leakage by the multiple barriers/NC layers in the doubly stacked devices. It is also found that the threshold voltages in the endurance characteristics anomalously increase with the P/E cycles, more strongly in the doubly stacked NC memories</P>