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F-Model 증기발생기의 7단 TSP FOSAR 수행을 통한 품질 향상 방법
이일국,지재용,최정훈,양선현,유태문 한국품질경영학회 2018 한국품질경영학회 학술대회 Vol.2018 No.-
원자력 발전소의 증기발생기 7단 튜브 지지판 상부에 대한 원격육안검사 업무를 효율적이고 체계적으로 수행하기 위해 필요한 제반 절차를 제공하여 증기발생기 7단 튜브 지지판 상부의 슬러지 축적상태와 이물질 유무를 확인 감시하여 증기발생기의 건전성와 안전성을 확보하였다. 직접 육안검사하기 어려운 곳을 장비를 통하여 전열관의 표면상태 및 슬러지 축적상태를 육안으로 확인할 수 있는 장비와 절차 개발로 증기발생기의 건전성 및 안전성 확보에 큰 기여를 하였다. 증기발생기에 국한된 것이 아닌 일반 산업현장에서의 구조물 검사 등 건전성 확보가 요구되는 산업현장에서 응용 가능하다. 증기발생기 구조 특성상 내부의 결함을 야기 시킬 수 있는 문제점에 대한 발견 및 조치가 쉽지 않지만 Video Scope를 이용한 이물질 검사/제거를 통해 증기발생기에 영향을 주지 않고 신속, 정확한 문제 진단 및 해결을 할 수 있으므로 써 시간 및 비용 감소에 크게 기여하고, 특수 검사 장비를 이용한 육안검사를 통하여 정확한 상태를 확인 가능함으로써 증기발생기의 품질 향상에도 크게 기여할 수 있다.
왕일국,김광서,양극영,이용수 대한건축학회 1998 大韓建築學會論文集 : 構造系 Vol.14 No.6
본 연구는 시멘트의 부분적 대체재로서 플라이애쉬를 혼입한 고강도 콘크 리트의 배합조건을 찾기위한 연구이다. 본 연구에서는 실험요소로 잔골재 율 40%, 50%와 4수준의 플라이애쉬 혼입률 0%, 10%, 20%, 30% 및 실리 카흄 혼입률 10%로 하였다. 잔골재율 40%와 50%의 콘크리트 비교에서 동 일 슬럼프를 얻기 위해 고성능 감수제를 조금씩 증가시켜 첨가했으며, 경 시변화에 따라 슬럼프 손실이 증가하였다. 실험에서 플라이애쉬의 치환율 이 증가함에 따라 공기량과 단위용적중량은 감소하는 경향을 보였으며, 잔 골재율이 증가하면 공기량은 감소하였으며 단위용적중량도 감소하는 경향 을 보였다. 플라이애쉬의 혼입률에 따른 고강도 콘크리트의 유동성에서 플 라이애쉬가 증가할수록 2∼3cm 정도로 슬럼프, 슬럼프-플로우가 감소하였 다. 플라이애쉬 혼입률이 30%일 때 압축강도가 감소하는 것으로 나타나 플라이애쉬의 적정 혼입률은 20%가 적당한 것으로 나타났다.
노인의 안면골 골절: 최근 5년간 300명의 환자에 대한 통계적 고찰
김일국,김용하,김태곤,이준호 대한의사협회 2011 대한의사협회지 Vol.54 No.10
Trauma in the elderly, such as facial bone fractures, has been increasing, but there is paucity of literature examining the facial bone fractures of the elderly. Therefore, this study contributes to the prevention of facial bone fractures in the elderly and presents support from the literature for establishing a support policy for the elderly. Retrospective analyses were conducted on clinical records from January 2006 through December 2010 for facial bone fractures in 474cases; of those cases, 300 patients were 55 years old or above. The statistical analyses were conducted according to the sex, age group, occupation, area of residence, time of accident,cause of accident, site, and multiplicity of the fractures, associated injuries, combined soft tissue injuries, treatment methods, and sequelae. Two hundred twenty-five (75.0%) were male and seventy-five (25.0%) were female patients. Among the age groups, patients in the age range of 65 to 74 years old were the most common. There were 136 (45.3%) patients who were farmers and agricultural support personnel. Patients in urban areas were more commocn than those from rural areas. The number of the patients increased each year except in 2008. The most common cause of fractures was traffic accidents, followed by slip down. Zygomatic fractures were the highest among all fracture types, followed by nasal bone fractures. There were more cases undergoing conservative treatment compared to those in a study of all age groups. Gathering information on facial bone fractures in the elderly will be valuable in establishing preventive strategies and policies.
충남에서 발생한 중증응급환자의 응급의료기관 일차 방문, 전원 및 재전원 현황
최일국,최한주,이혜정 대한응급의학회 2018 대한응급의학회지 Vol.29 No.5
Objective: Regionalization is one of the principal subjects for the advancement of rural emergency medical service systems in South Korea. This study shows the characteristics of interhospital transfer and status of the incidence of three major emergency disorders (acute myocardial infarction [AMI], acute stroke, and severe trauma) in one local province. Methods: A retrospective study was conducted for patients with three major emergency disorders who visited emergency medical facilities in one local province from January 2013 to December 2015, on the basis of the National Emergency Department Information System (NEDIS) data. Results: The incidence of three major emergency disorders had increased annually. Patients with each of these disorders tended to choose distinguishing methods of visiting emergency medical facilities. AMI patients tended to visited emergency medical facilities using private cars or on foot, while severe trauma patients usually visited by 119 ambulance, and acute stroke patients used 119 ambulance and private car in similar amounts. Overall, 65% of AMI patients were treated in intraregional medical facilities, but about 70% of acute stoke and severe trauma patients were transferred outside of the region. Conclusion: Because each of these disorders has an individual characteristic, it is difficult to expect a solution for the problems associated with emergency disorders just by assuring the availability of medical resources. Based on regionalization, a policy to provide the optimal treatment for those emergency disorders should be developed by planning public medical service systems based on the individual characteristics of emergency disorders, the standardized transfer plans of emergency patients and the assurance for mobilization and sharing of confined medical resources.
비수용액 전해질에서 전기도금한 니켈-TiO₂ 복합 도금층의 표면 및 광분해 특성 연구
조일국(Il guk Jo),지창욱(Chang wook Ji),최철영(Chul young Choi),김영석(Young seok Kim),김양도(Yang do Kim) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.5
Composite plating is a method of co-deposition of plating layer with metallic and/or non-metallic particles to improve the plating layer properties such as high corrosion resistance and photolysis of organic compounds. The properties of nickel-ceramic composite plating are significantly depend on the surface characteristics of co-deposited particles as well as the quantity in electrolyte. In this study, Ni-TiO₂ composite coating layer was produced by electrodeposition technique from non-aqueous electrolyte and its surface characteristics as well as photolytic properties were investigated. The amounts of immobilized TiO2 particles increased with increasing the initial TiO₂ particles contents in the bath. Samples electroplated with the current density of 0.5 A/d㎡ showed the significantly improved homogeneous TiO₂ particles distribution. The corrosion resistance of Ni-TiO₂ composite coating layer also improved with increasing the amounts of TiO₂ particles. Etched sample showed about 10% increased photolytic rate of organic matter compare to that of the non-etched.