알루미늄 합금과 고장력 강판 접합을 위한 헬리컬 SPR의 단조공정 설계

김원영, 김동범, 김기호, 김도훈, 이인환, 조해용 충북대학교 산업과학기술연구소 2013 산업과학기술연구 논문집 Vol.27 No.2

A self-piercing rivet(SPR) is a mechanical component for joining dissimilar materials. It is used for joining dissimilar material sheets such as aluminum alloy and steel. The self-piercing rivet directly pierces into sheets without drilling sheets beforehand unlike conventional rivets. However, the self-piercing rivet occurs buckling when piercing high strength steel. Therefore, a helical SPR which can pierce high strength steel sheet was designed. In this study, forging process was designed for manufacturing the helical SPR and simulated by using commercial FEM code DEFORM-3D. In the simulation of forging process for manufacturing rivet, process sequence, formability, forging load were investigated. The suitable forging process could be designed by comparisons of simulated results. Experimental trials have been carried out for same conditions as simulated ones. The simulated results agreed with the experimental ones. So, the analytic approach in this thesis is useful to save cost and time in the forging industry

히스토아크릴을 이용한 십이지장 궤양 출혈의 지혈 후 발생한 급성췌장염

유재훈,문원,노지훈,구동영,조영화,김기수,윤준모 고신대학교 의과대학 2010 고신대학교 의과대학 학술지 Vol.25 No.1

Upper gastrointestinal bleeding is common and potentially life threatening medical emergency. Emergency endoscopy is the first choice of diagnostic and treatment measure for patients with active upper gastrointestinal bleeding. Histoacryl should be considered a second-line treatment modality when conventional treatments were failed. However, it might cause several complications. Herein, we report a case of acute pancreatitis developed after histoacryl injection therapy for active duodenal ulcer bleeding. A 71-year-old man was admitted with melena and hematemesis. On emergency endoscopy, a 2 cm sized active ulcer with bleeding from an exposedvessel was seen at the duodenal bulb. Attempts to arrest the bleeding with hemoclipping and submucosal epinephrine injection were tried, but failed. We changed the method to endoscopic histoacryl injection, and obtained hemostasis immediately. A few hourslater, after successful hemostasis, patient complained diffuse abdominal pain. Ultrasonography revealed hyperechoic heterogenous diffuse pancreatic enlargement and right pararenal space fluid collection, this ultrasonographic findings and elevated serum pancreatic enzymes are compatible with acute pancreatitis.

강소성 정적-외연적 방법의 개선에 대한 연구

정동원,이승훈 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.1

In rigid-plastic finite element method, there is a heavy computation time and convergence problem. In this study, static-explicit rigid-plastic finite element method will be introduced. This method is the way that restrict the convergence interval. In result, convergence problem and computation time due to large non-linearity in the existing numerical analysis method were no longer a critical problem. Also, we investigated the effect of punch stroke and the strain increment this method. It is expected that various results from the numerical analysis will give very useful information for the design of tools in sheet metal forming process.

정적 내연적 방법을 이용한 CM-D-PLR판넬 해석에 관한 연구

정동원,안현길,고형훈 제주대학교 해양과환경연구소 2005 해양과환경연구소 연구논문집 Vol.29 No.1

PNL S/ABS HUS’G L/R 제품개발을 위한 성형해석

정동원,고형훈,문원섭 제주대학교 공과대학 첨단기술연구소 2005 尖端技術硏究所論文集 Vol.16 No.1

The characteristic of sheet metal process is the few loss of material during process, the short processing time and the excellent price and strength. FEA applications with the sheet metal forming process is purpose that increasing due to the potential of time and cost saving. This study are industrial field problem solve using AutoForm which used a Static implicit way. According to this study, the results of simulation will give industrial site good information to access the Design sheet metal forming.

BTX에 의한 2-프로판을 액-액 추출계의 상평형에 관한 연구

鄭詳勳,申鉉心,朴東源 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.1

The experimental binodal curves and tie line data were determined for ternary systems of 2-propanol-water with benzene, toluene and o-xylene as solvents at 25℃, and those tie line data were used to examine thermodynamic consistency. The experimental tie line data were correlated with UNIQUAC and modified UNIQUAC model and the parameters in each model and the calculated values of tie lines were predicted. The distribution curves in the equilibrium of ternary systems were determined to find the extraction effect.

윤곽선 정보와 watershed segmentation을 이용한 영역 추출

이원효,설경호,염동훈,고기영,김두영 동아대학교 정보기술연구소 2003 情報技術硏究所論文誌 Vol.11 No.1

This paper proposed a extracting method of the region for image using segmentation and edge information. First proposed algorithm extract information using canny edge detector and the image was divided by watershed segmentation. And it extract the image with edge information by merging region. Finally we compare the proposed method with levelset method. In the result proposed method not only extract the image with accurate region but also reduce operation time.

교정 치료 환자에 있어 항균 varnish 처치 전후의 타액 내 Streptococcus mutans 균주의 변화에 관한 연구

남동석,양원식,장영일,서정훈,정종평,김태우 대한치과교정학회 1994 대한치과교정학회지 Vol.24 No.3

Dental caries is one of the most prevalent dental diseases in Korea and its prevention is very important in orthodontic therapy. For the cleansing action of saliva itself and/or tooth-brushing is lowered in patient with fixed orthodontic appliance, oral hygiene of the patient becomes worse, which provides more favorable environment for micro-organisms. Chlorexidine, one of the series of bisguanide, has been reported to be strong antimicrobial agent and very effective on Streptococcus mutans. The purpose of this study is to evaluate the possibility of chlorhexidine as a anticariogenic agent in fixed orthodontic therapy. We used the varnish containing chlorhexidine as a main ingredient for the chemical control of salivary S.mutans in patients with fixed appliance therapy. We applied the varnish containing chlorhexidine on the labial and interproximal surface of the teeth before bonding and banding teeth of our patients(N=20) and compared to control group patients(N=20). Before the application of chlorhexidine varnish and four times periodically after the completion of fixed appliance set-up, we sampled saliva of both group patients and incuvate S.mutans for 24 hours. In the culture study of sampled saliva, counting the number of S.mutans colonies, we founded as follows : 1. In patients with fixed appliance therapy, the risk of dental caries increase when it compared to that of preorthodontic treatment ; The number of salivary S.mutans increase in patient's oral cavity. 2. The experimental agent that contain chlorhexidine is effective to reduce the number of salivary S.mutans. 3. For the effect of this agent is not ever-lasting, periodical application is needed, and additional study for economical interval and number of application is needed.

모 중장비 제조 사업장의 유해작업요인 평가에 관한 연구

장성훈,이원진,서창호,김종규,이영신,황천현,서동윤 건국대학교 의과학연구소 1996 건국의과학학술지 Vol.6 No.-

We evaluated the types and the amount of hazards in a heavy equipment factory and a plant factory to improve workers' health and to determine the priority in occupational health programs. We first inspected the working processes to find hazardous agents, measured them in each process environment, and compare the results with their TLVs(Threshold Level Value). This study was carried out from December 26, 1995 to January 30, 1996. The results are as follows: 1. In two factories, we identified the following hazardous agents: noise, dust, heavy metal fume, organic solvents, illumination, gases and ultraviolet light. 2. In the heavy equipment factory, some agents were over their TLVs in the following departments. 1) Preparation Department: dust, Pb, Mn, Fe₂O₃, NO₂ 2) Manufacture Department: noise, dust, Pb, Mn, Fe₂O₃, NO₂ 3) Assembly Department: noise 4) Technique Department: NO₂ 3. In the plant factory, some agents were over their TLVs in the following departments: 1) 1 Bay: illumination, Pb, Mn, Fe₂O₃ 2) 2 Bay: dust, illumination, Cu 3) 3 Bay: illumination 4) 4 Bay: noise, dust, Pb, Mn, Fe₂O₃, NO₂ 5) 5 Bay: noise, dust, Pb, Mn, Fe₂O₃, NO₂ 6) 6 Bay: Pb, Mn, NO₂ We concluded that the hazardous agents such as heavy metal fume, noise and noxious gas were required to be controlled at first.

개인식별 감정례

최종훈,이한영,이원태,이동주,김종열 大韓法醫學會 1999 대한법의학회지 Vol.23 No.2

It is noteworthy that most unidentified dead are unnatural and violent deaths. The accurate identification of a decedent permits certification of death and notification of next of kin. Only then may they proceed with the probate of wills, apply for disbursement of benefits and insurance, and begin to work through the grieving process. Law enforcement agencies need positive identification to pick up the leads of investigation to develop suspects, establish the corpus delicti of homicide and reconstruct the sequence of events of a crime. Agencies and a variety of consultants are involved in recognizing and developing the unique features of a decedent that lead to identification. Cooperative working relations with newspaper and other media will help in publicizing the need for persons with information to come forward diagrammatically. In this paper, 5 individual identification cases in unexpected or homicidal deaths are described. The comparison between the postmortem and antemortem records show that the victims are correctly identified.