콘덴서제조공장의 전력부하설비의 고조파에 관한 연구

김득중,심재명,장석구 大田産業大學校 2002 한밭대학교 논문집 Vol.19 No.-

Lately power semiconductors such as thyristor devices is widely used in electric power load installation. The use power semiconductors is easy to be a major cause of harmonics generation. In this paper, voltage and current harmonics is to be mesured in twenty places which is selected from power receiving board of the capacitor mannufactory. The results is analysised by experimental observation. According to the analysis contents, total voltage harmonics occured in the 22.9kv y-connection is to be proved within harmonics international standard but current harmonics was approached to standard upper limits line. The harmonics incoming through the distribution line by harmonics of the near factory is measured at the measurement factory. In this paper, the countermeasure to decrease harmonics generation quantity is considered through the theoretical survey.

가공 송전선의 부식진단시스템 개발

김성덕,심재명,정원일,장석구,이승호,김영달 大田産業大學校 2000 한밭대학교 논문집 Vol.17 No.1

A diagnosis method to inspect deterioration in overhead ACSR conductors is discussed in this paper. Corrosion would be occurred by various and complex factors such as atmospheric indices, installation environment and metallic configuration, but must of corrosions are mainly due to atmospheric corrosion, galvanic corrosion and crevice corrosion. Such corrosion in ACSR would lead to be zinc loss of galvanized steel strand and reduction of cross section area of aluminum strand and it may be mechanical strength of power conductor in service to reduce. Global corrosion can be treated as average corrosion occurring on the conductor and it would appear to any material variations by the elapsed years of the conductor in the atmosphere. Therefore, as estimating the loss rate of tensile strength of aged conductor corresponding to the elapsed years, it would be possible to quantify global corrosion indirectly to a prediction function. Through such results, loss degree for ACSR 97[mm2] is classified to 4 ranges. i.e., no loss, possible loss, partial loss and sever loss. Both local and global corrosion could not be detected by visual inspection, but we proposed a corrosion detector system using a solenoid eddy current sensor in order to inspect such corrosion for old conductor. Corrosion detecting system is constituted to a corrosion detector and a ground station controller. Corrosion detector consists of sensor coil and sensing head, signal processing unit, data communication system, motor driver and controller, u-processors and power supply. After considering operation and manipulation in the field, motor, battery and wheels were selected and designed in order to reduce the weight of corrosion detector. Programs for u-processors, measurement program operated in a PC were also developed. Before testing the corrosion detector in the field, several experiments were carried out in the laboratory for artificial corroded samples. Sensor performance, mechanical tests such running ability and weight, and RF data transmission as well as measurement program were examined. After testing a simple corrosion detector system in the laboratory, several filed tests were carried out in practice transmission lines installed in domestic area. Finally, the suggested corrosion detecting system shows an effectiveness to detect local corrosion in acted conductor in practice.

증점제를 사용한 고유동콘크리트의 기포조직과 내동해성에 관한 실험적 연구

김무한,권영진,강석표,여동구,김용로,장종호 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.1

Recently, lots of studies for high flowing concrete have been suggested under practical use that it is only a way to solve the confronted problem. However, most studies have been concentrated on the manufacture method and properties of fresh concrete, but there is few studies for the durability of hardened concrete, specially for the freezing and thawing. It is generally known that the frost resistance of concrete is much affected by the air content in concrete and by the air void system. The frost resistance is also believed to vary with the strength of concrete. The purpose of this experimental study is to make a comparison between high flowing concrete using viscosity agent and ordinary concrete about the effect of the viscosity agent, air content and curing method on the frost resistance. As the result of tutus study, the frost resistance have not effect the viscosity agent but effect the different of curing methods.

조기유자망 어구의 개량 및 생력화 조업시스템 개발 : 1. 현장 조업시스템 비교 분석에 관하여

김석종,김병엽,구명성 제주대학교 해양과환경연구소 2005 해양과환경연구소 연구논문집 Vol.29 No.1

조기유자망 어구의 개량 및 생력화 조업시스템 개발 : 3. 생력형 5단 양망기의 해상 성능 시험

김석종,구명성,강경범,서대범,정용진 제주대학교 해양과환경연구소 2005 해양과환경연구소 연구논문집 Vol.29 No.2

Lutembacher 증후군 환자 증례 보고

김성범,서정주,곽철훈,김상민,이보라,민선경,황은구,김용인,조욱현,최석구 인제대학교 2008 仁濟醫學 Vol.29 No.-

Lutembacher's syndrome is rare combination of mitral stenosis (MS) and atrial septal defect (ASD). The hemodynamic interplay between the MS and ASD leads to wide variation of clinical presentation. Here we describe a 43-year-old female with Lutembacher's syndrome and tricuspid regurgitation with pulmonary hypertension, who underwent direct closure of ASD and tricuspid valvuloplasty successfully. We also reviewed other literatures in an effort to increase awareness of this condition.

A rare case of extensive papillary muscle calcification in senile cardiac calcification syndrome

김은진;송봉근;강민호;손형래;홍수민;박동원;허승혜;김계연;최석구 인제대학교 2011 仁濟醫學 Vol.32 No.-

광범위 유두근 석회화는 흔하지 앉으며, 원인과 임상적 중요성에 관한 문헌만 드물게 찾아볼 수 있다. 반면에 작은 석회 침착은 노인에서 흔하며 심장 첨부에 주로 나타난다. 유두근 석회화는 관상동맥질환, 확장성 심근병증, 승모관 질환, 고칼슘혈증, 그리고 말기신부전에서 인산칼슘의 중가와 연관성이 있다. 저자는 심장초옴파와 MDCT를 통해 진단된 전외측 유두근의 광범위 석회화의 드문 사례가 있어 보고한다.

Goldman's Algorithm을 이용한 비외상성 흉통 환자의 분석

조석진,유진현,김찬웅,어은경,정구영 대한응급의학회 1999 대한응급의학회지 Vol.10 No.4

Back ground : It is important to evaluate the patient presenting with non-traumatic chest pain in emergency department, and it is also difficult to classify appropriately. The purpose of this study is to predict probability of acute myocardial infarction(AMI) and assess the group for low probability of AMI that is target for observation-unit of chest pain in emergency department. Methods : A prospective, clinical study was performed from March 1998 to August 1998 at the department of emergency medicine, Ewha Womans University Mokdong hospital. We classified high-probability group and low-probability group of AMI according to Goldman's algorithm and then compared with the final diagnosis. Results : The study included 218 patients. 84 patients(39%) was the high-probability group and 134 patients(61%) was the low-probability group of AMI. As compared with final diagnosis, AMI was 47 patients(56%) among the high-probability group and 1 patient(0.7%) among the low-probability group. We observed sensitivity of 98%, specificity of 78% in predicting AMI. Conclusion : The classification according to Goldman's algorithm may be useful predictor of AMI and improve triage for emergency department patients with chest pain. It is also helpful for management of observation-unit of chest pain in emergency department.

급성 ST 분절 상승 심근경색증의 표준진료지침 설계

권선옥,김우식,오명기,나종천,이홍기,조욱현,최석구 인제대학교 2006 仁濟醫學 Vol.27 No.-

The use of critical pathways for a variety of clinical conditions has grown rapidly in recent years, particularly pathways for patients with acute myocardial infarction. We intend to determine the impact of a clinical pathway on ST-elevation myocardial infarction (STEMI) and to evaluate the efficacy and safety of facilitated percutaneous coronary intervention (PCI) compared with primary PCI. Low risk STEMI patients (ST elevation >0.1mV in more than 2 limb leads or ST elevation >0.2mV in contiguous precordial lead, chest pain lasting more than 30 min without response to nitroglycerin) will be included. All patients will be also treated medically according to critical pathway. STEMI is one of the common diseases in emergency medicine and so it is necessary to establish realistic treatment guidelines. The use of critical pathways will improve the quality of care.

췌장이식

한덕종,김인구,김석구,박건춘,민병철 울산대학교 의과대학 1992 울산의대학술지 Vol.1 No.1

Primary candidate for pancreas transplantation is patients with type Ⅰ diabetes mellitus of juvenile oneset. At present the patients selected for transplantation often have end stage renal disease, far advanced vascular disease and diabetic neuropathy. In these days, the survival of pancreas transplantation for treatments of patients with type Ⅰ diabetes mellitus has been improved especially in simultaneous pancreas and kidney transplantation. Various innovations in immunosuppression, management of the pancreatic ductal exocrine secretion, recipient selection and HLA matching have been contributed to achieve a reasonable outcome in pancreas transplantation compared with other organ transplantation. Current improved graft survival has stimulated many centers in the world to start pancreas transplantation program. Recently we successfully performed the first case of simultaneous pancreas and kidney transplantation in Korea. After 5 cases of pancreas transplantation in our department in type Ⅰ DM, we think that it is the time to review the pancreas transplantation to give an insight of this new field to our colleagues.