재생굵은골재를 사용한 콘크리트의 동결융해 특성

성찬용,윤준노,김영익,임상혁,정덕현 충남대학교 농업과학연구소 2003 농업과학연구 Vol.30 No.2

이 연구는 플라이 애시를 결합재 중량의 20%, 재생굵은골재를 천연쇄석굵은 골재의 0%, 25%, 50%, 75%, 100%를 치환하여 압축강도와 동결융해 특성을 구명하였으며, 이 연구를 통해 얻어진 결과를 요약하면 다음과 같다. 1. 재령 28일의 압축강도는 모든 배합비와 W/B 35%에서 400㎏f/㎠이상으로 나타나 고강도콘크리트에 이용될 수 있을 것으로 생각된다. 2. 중량감소율은 동결융해 300사이클에서 1%미만으로 나타났고, 표면박리와 같은 현상은 나타나지 않았으며, 재생골재의 대체율이 증가할수록 감소율은 증가하였다. 3. 초음파진동속도는 동결융해 300사이클에서 19~24%정도의 감소율을 나타내었으며, 재생골재의 대체율이 증가할수록 감소율은 증가하는 경향을 나타내었다. 4. 상대동탄성계슈는 재생골재의 대체율에 따라 60~72%의 범위로 나타내었으며, 재생골재 대체율이 증가할수록 감소하는 경향을 나타내었다. 5. 내구성지수는 모든 배합에서 60이상을 나타내었으나, 재생골재 대체율이 100%일때는 급격히 떨어지는 경향을 나타내었다. 6. 재생굵은골재를 사용한 콘크리트의 압축강도, 중량감소율, 초음파진동속도, 상대동탄성계수, 내구성지수 시험결과를 볼 때, 시험에 사용한 재생굵은 골재는 고강도콘크리트에 사용이 가능할 것으로 판단된다. This study was performed to examine the freezing and thawing properties of the high strength concrete using recycled coarse aggregate. The recycled coarse aggregate was replaced by 0%, 25%, 50%, 75% and 100% of natural crushed aggregate. The compressive strength of the concrete used recycled coarse aggregate was shown in more than 400kgf/㎤ at the curing age 28 days. The weight loss ratio by freezing and thawing was shown in less than 1% at all mix type. The pulse velocity and relative dynamic modulus were decreased with increasing the freezing and thawing cycles. Also, durability factor for the freezing and thawing were decreased with increasing the content of recycled coarse aggregate. But, recycled concrete replaced with recycled coarse aggregate 100% was shown in more than 60 by durability factor in freezing and thawing of 300cycles Accordingly, these recycled coarse aggregate can be used for high strength concrete.

상호운용성 지원을 위한 이동 에이전트 시스템 설계

정성옥,이정기,홍성표,송기범,이준 조선대학교 전자정보통신연구소 2002 電子情報通信硏究所論文誌 Vol.5 No.1

A mobile agent is a computer program that acts autonomously on behalf of a person or organization and that has the unique ability to transport itself from one system in a network to another. An agent system is a platform that can create, interpret, execute, transfer and terminate agents. But, most current mobile agent systems adopted their own architectures, being implemented in various ways. Since those agent systems provide different interfaces, agens created in one mobile agent system could not move to other agent systems perform their task. To solve this problem, interoperability becomes one of the important issues on mobile agent systems. The OMG(Object management Group) proposed: the MAF(Mobile Agent Facility) specification for the interoperability among heterogeneous mobile agent systems. The MAF specification contains MAFAgentSystem and MAFFinder interfaces, and defines agent management, code mobility and naming rule. In this paper, we propose an execution model that can execute mobile agents within an agent system and migrate them to a remote agent system as conforming MAF, and design the structure and functions of its agent system. Our model uses Java and CORBA ORB in its the implementation and exploits their characteristics appropriately. Specifically its agents beside its clients can spawn child agents and control other agents.

실시간 패킷 모니터링에 의한 성능 관리 방안에 관한 연구

정상준,정영석 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(B)

본 논문에서는 실시간 패킷 모니터링에 의한 성능 관리 방안 기법을 제안한다. 제안된 기법에서는 트래픽의 부하 상태를 감시하는 모니터링 시스템과 모니터링된 트래픽을 보여주는 인터페이스 부분으로 나눌 수 있다. 모니터링 시스템은 각 노드의 트래픽을 감시하여 각 패킷별로 구분하여 사용자 인터페이스에 넘겨주며, 이를 사용자 인터페이스에서는 수치 데이터 또는 그래프로 표시한다. 이 시스템은 각 노드의 부하 여부를 감시하여, 비정상적인 트래픽의 폭주를 발견하게 되면 분석 모듈의 작동에 의해 해킹을 비롯한 네트워크 장애를 감지할 수 있다.

당뇨망막증 환자에서 건강보조제 복용 후 양안 동시에 발생한 망막출혈 1례

이상준,이정주,김수영,김신동 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.2

Purpose : This is a report of retinal hemorrhage in a patient suffering from diabetic retinopathy taking 10 days of protein supplements. Method : A 38-year-old female patient who had received a panretinal photocoagulation started taking supplements made of cocoon(cocoon steamed powder, ginseng powder, pepino abstraction powder et al.) for 10 days. Then, the patient went on to suffer from an uncontrollable blood pressure, a general edema and a loss in visual acuity. The patient's vision was counter finger 50cm in both eyes. The fundoscopy revealed vitreous hemorrhage in the right eye and preretinal hemorrhage in the left eye. She was hospitalized in nephrology, We waited to resolve hemorrhages. But hemorrhages was not improvement, we performed a pars plana vitrectomy and laser photocoagulation. Results : After the operation, the corrected vision was 0.8 in the right and 0.63 in the left eye, respectively. The patient's general condition was improved with diuretics. Discussion : The main ingredient of the supplements that the patient took were peptides. So this patient with diabetic renal failure had to reduce renal function which cause a reduction in glomerular filtration rate, a increase in blood creatinine levels, edema due to increased blood pressure and vitreal hemorrhaging in both eyes. In conclusion, one must be careful of health supplements because we cannot be sure of the ingredients and the side effects which could worsen certain illnesses.

[논문]도시하수처리장으로부터 분리한 호기성 탈질균의 특성

정용주,조순자,이상준 부산대학교 환경문제연구소 2004 環境硏究報 Vol.22 No.-

Characterization of an Aerobic Denitrifier Isolated from Municipal Sewage Treatment Plant

열공성 뇌경색과 뇌내출혈의 위험인자 비교

이장준,이현아,최종환,이형,임정근,이상도,박영춘 계명대학교 의과학연구소 2000 계명의대학술지 Vol.19 No.2

Cerebral small vessel disease is the most important cause of lacunar infarction (LI) and intracerebral hemorrhage (ICH). It is generally postulated that, in its early stages, the vascular lesion engenders vessel wall fragility and ICH. But if rupture dose not occur, segmental vessel occlusion evolves, producing LI. It may be a common aging phenomenon that is exacerbated by hypertension and diabetes mellitus. This study was performed to evaluate risk factors of LI and ICH. We reviewed retrospectively the medical records of 690 patients (254 LI, 436 ICH) with stroke who were admitted to Keimyung University Dongsan Medical Center from January 1995 to December 1998. The major risk factors including age, sex, hypertension, diabetes mellitus and several minor risk factors were analyzed in these patients. Older age (p<0.01), male sex(p<0.01), hypertension with treatment(p<0.01), hypertension with long duration(p<0.01) and hypertriglyceridemia(p<0.01), cigarette smoking(p<0.01) were significantly more frequent in LI. Younger age(p<0.01), female sex(p<0.01) and hypertension without treatment(p<0.01), hypertension with short duration(p<0.01) were more frequent in ICH. The prevalence, duration and treatment of diabetes mellitus were not different between these two groups. This study show that the age, sex, treatment of hypertension, duration of hypertension and cigarette smoking seem to be significant risk factors between LI and ICH.

판별분석법을 이용한 관상동맥질환 고위험군의 예측

김성률,김기현,정갑열,김정만,박경일,김준연,이상주,김원술 동아대학교 부설 산업의학연구소 1995 산업의학연구소 논총 Vol.- No.2

The objective of this study is to predict the high risk group of coronary artery disease from body mass index, blood pressure, fasting blood sugar and serum lipids level using the method of discriminant analysis. Variables with significant difference between coronary artery disease group and normal group were HDS-C, LDL-C/HDL-C, LDL-C, and TG. But the acuity did not exceed 70% in any single variable. As the results of discriminant analysis, statistically significant discriminant variables were HDL-C, T-chol, FBS and TG. The discriminant equation was(Y) = -0.06759(HDL-C) + 0.01498(T-chol),+0.01923(FBS) - 0.01421(TG) + 0.5187, and the overall discriminant power using the above 4 variables was 79.3%

이방성 함유체가 포함된 2차원 무한 고체의 탄성 해석에 관한 연구

李鼎基,崔成準 홍익대학교 산업기술연구소 1997 産業技術 Vol.7 No.-

A volume integral equation method and a mixed volume and boundary integral equation method are presented for solving the elastostatic plane problems in unbounded solids containing orthotropic/isotropic inclusion and voids. The detailed analysis of lthe displacement and stress fields are developed for cylindrical land elliptic cylindrical inclusion/voids. The accuracy and efficiency of the method are examined through comparison with results obtained from analytical and boundary integral equation methods.

각종 소화성질환에서의 Campylobacter Pylori의 검출에 관하여

허정욱,강영우,박준호,박승국,하경임,김재룡,안성훈,박선우 啓明大學校 醫科大學 1988 계명의대학술지 Vol.7 No.2

Peptic disorders are among the most common maladies in korea as the world. In most cases their etiologies not be established and their pathophysioolgy remain obscure. Although the persence of fastric bacteria has been logn established, recently campylobacter pylori seems to be etiologic agent of peptic disorders. Campylobacter pylori is visualized in most cases of peptic disorders and not visualized after treatment of bctericidal agents, bismuth compound or metronidazole. We had a following results for identification of campylocacter pylori in stomach and duodenal mcuosa via endoscipc biopsy. 1. We studied 54 patients who had dyspeptic symptoms, 29 males. 2. Most patients are in 5th decades, next in 3rd and 6th in order. 3. Ptients were composed of 27 peptic ulcer, 22 gastitis and 5 gastric carcinoma. 4. Campylobacter pylori was identified in 69% of total patients, peptic ulcer 63%, gastritis 77%, stomach carcinoma leastly.

지진하중을 받는 5경간씩 연속인 10경간 강상자형교의 거더간 충돌 분석

박선준,강성후,이정용 東新大學校 工業技術硏究所 2004 工業技術硏究 Vol.10 No.-

The present study determined whether there is collision between girders due to difference in natural period between neighboring vibration systems when a designed earthquake load is applied to a 3-lane 10-span steel box girder bridge with 5-span continuity, which are equipped with friction pot bearings that receive earthquake load, and examined the stability of a formula that calculates the shift of the sliding bearings, which is used in expansion joint design. In addition, this study developed a simple collision evaluation formula directly applicable in determining the possibility of collision.