• 한국건설관리학회논문집
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• 제20권1호
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• pp.32-40
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• 2019

본 연구에서는 통계분석과 사례 및 전문가 조사를 통하여 건축사 손해배상보험의 운영실태와 문제점을 적시하고 개선방안을 분석하였다. 건축사법에서는 모든 건축물의 설계와 공사감리에 대하여 의무적으로 손해배상보험 또는 공제에 가입하도록 하고 있다. 건축사보험의 현황을 분석하여 나온 문제점들에 대한 본 연구에서 제시하는 개선방안은 다음과 같다. 먼저 건축사 손해손해배상 가입율을 제고시켜야 한다. 이를 위해 현재 장관 공문으로 시행하고 있는 건축사의 보험증서 제출에 관한 사항을 건축사 관련 용역손해배상보험(공제)업무요령 고시에 넣어서 명확하게 규정하는 것이 필요하다. 둘째로 보험가입금액을 현실화시켜야 한다. 우리나라도 실질적인 배상능력 확보를 위하여 보험가입금액을 용역목적물 전체가액의 10% 이상으로 상향 조정하고, 단계적으로 확대시켜야 할 것이다. 셋째로 보험기간을 완공 후 1년까지로 연장하여 설계 과실에 의한 사고의 배상 처리가 가능하도록 해야 한다. 설계 하자에 의한 부실은 완공 후 1년 이내에 대부분 파악이 가능하므로, 보험기간을 완공 후 1년까지로 연장할 필요가 있다. 넷째로 보험범위를 확대해야 한다. 장기적으로는 보험제도의 실효성 확보를 위해 담보범위를 제3자의 재산상 손해뿐만 아니라 인적손해까지 순차적으로 확대하는 것이 필요하다. 마지막으로 보험업체 간 사고실적 공유 시스템을 구축하고, 이를 기반으로 보험료에 대한 할증 및 할인하도록 해야 할 것이다.

• Journal of Chest Surgery
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• 제31권6호
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• pp.576-580
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• 1998

서울중앙병원에서 1989년 개원 이래로 시행해 오던 우전측부 개흉술을 통한 심방중격결손증과 승모판막에 대한 수술 결과를 알아보고 1997년 8월부터 10월까지 보다 광범위하게 시행된 최소침습적인 개심술의 결과를 정리하여 향후 최소침습적인 수술 조작에 대한 지표로 삼고자 하였다. 우전측부 개흉으로 17예의 심방중격결손증, 4예의 승모판 성형술, 6예의 승모판막치환술, 그리고 1예의 세번째의 심장수술에서의 삼첨판과 승모판 재대치술을 시행하여 1예의 출혈로 인한 재수술을 제외하고는 이 접근으로 인한 합병증은 없었다. 1997년 8월부터 10월까지 6례의 대동맥판막 치환례중 누두흉 1례를 제외한 5례에서 4례는 상부흉골절개를, 1례에서는 횡흉골절개를 시도하였다. 같은 기간 동안에 7예의 심방중격결손증에서 우전측부 개흉술과 하부 흉골절개로 수술을 시행하여 무리없이 수술을 마칠 수 있었고 미용적인 면과 출혈량에서 특히 우수한 결과를 나타내었다. 이에 저자는 이러한 최소 침습적인 개심술이 안전하고 환자의 호응이 높아 앞으로 보다 적극적으로 시도되어야 할 것으로 결론을 내린다.

• Journal of Chest Surgery
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• 제7권2호
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• pp.163-168
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• 1974

Five cases of traumatic diaphragmatic hernia were repaired in the Department of Thoracic Surgery, Seoul National University Hospital, during the period from 1967 to 1974. The first case, a 14-year aid girl, was diagnosed as diaphragmatic hernia during laparotomy because of jejunal perforation 3 days after traffic accident. Herniated stomach, transverse colon, spleen and left lobe of the liver were repositioned and the diaphragmatic rupture on left posterolateral portion was repaired with two layers of nonabsorbable sutures by transthoracic approach. The second case, a 26-year old man,was diagnosed immediately after traffic accident at a local clinic and transferred to this hospital 24 hours later. Herniated stomach, transverse colon and jejunum were repositioned amd diaphragmatic rupture,about 9 cm in length,from the posterolat.edge to the base of pericardium was sutured in two layers. The third case, a 26-year old man who had stab wound on the left lower lateral chest two years ago,was admitted with sudden abdominal pain and vomiting. Upper gastrointestinal series with barium meal revealed diaphragmatic hernia. The herniated stomach and transverse colon through the defect,about 3.5cm in diameter, at anterolateral portion on the left side,were repositioned and repaired with two layers of nonabsorbable sutures. The forth case, a 26-year old man, sustained blunt trauma to the chest by a roller and was transferred to the emergency room complaining of dyspnea 40 minutes after the accident. The diaphragmatic rupture extended from left midaxillary line to contralateral anterior axillary line,about 20cm long, at anterior portion of diaphragm, which was repaired with two layers, of nonabsorbable sutures. The fifth case, a 4-year old girl, had two separate diaphragmatic ruptures on both sides, which were caused by traffic accident. Immediate upper gastrointestinal series after injury showed herniated stomach, colon and spleen into left Chest cavity. Another small rupture with anterior edge of right lobe of the liver in chest cavity was noted. These were repaired with non-absorbable sutures via thoracotomy.

• International Journal of Automotive Technology
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• 제5권3호
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• pp.215-219
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• 2004

A vehicle structure needs to be more precisely analyzed because of complexities and varieties. Structural fatigue which is generated by fluctuations of stresses during the service life of a mechanical system is the primary concern in the structural design for safety. A fatigue life is difficult to obtain in structural components during the service life of mechanical systems since the fluctuating stress contributes to fatigue. This study introduces new procedures to measure the lethargy coefficient and to predict the fatigue life of a mechanical structure by using molecular dynamic simulation. A lethargy coefficient is the total defect-estimating coefficient, which was obtained by using the results of a simple tensile test in this study. With this lethargy coefficient, fatigue life was estimated. The proposed method will be useful in predicting the fatigue life of a structurally-modified vehicle design. The effectiveness of the proposed method using lethargy coefficient measurement to predict the fatigue life of a structure was examined by applying this method to predict the fatigue life of SS41 steel, used extensively as material of vehicle structures. Two types of specimen such as pre-cracked plate and simple plate is discussed. equation of fatigue life using the lethargy coefficient and failure time, both obtained from a simple tensile test, will be useful in engineering. This measurement and prediction technology will be extended for use in analysis of any geometric shapes of modified automotive structures.

• Journal of Korean Neurosurgical Society
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• 제29권9호
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• pp.1204-1208
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• 2000

Objectives : At the closure of the transsphenoidal approach(TSA), the proper sellar floor reconstruction plays an important role in preventing postoperative complications. The septal cartilage, perpendicular plate of nasal septum, and the sphenoid sinus bone are usually used to repair the sellar floor as a bone splint. The authors evaluate the usefulness of a silicone plate as a substitute for bone splint to close a defect of the sellar floor. Materials and Methods : A silicone plate was used to repair the sellar floor in 7 patients with sellar lesions which included four pituitary adenomas, two Rathke's cleft cysts and one metastatic tumor. Among seven cases, five cases underwent a standard TSAs and two received a extended TSAs. The trajectories of the approach were sublabial in four cases and endonasal routes in three cases. The silicone plate for implantation was cut to a size of slightly larger than that of bone window and inserted with a three-pronged fork, and then adjusted precisely. Results : In six patients, there were no complications which related to sellar floor reconstruction. A postoperative cerebrospinal fluid(CSF) rhinorrhea was observed in one patient with pituitary macroadenoma. Conclusions : From the authors' experience, the advantages of the silicone plate are its simplicity of molding to fit any size of sellar floor defects, and easy detection of previously created bone window at reoperation.

• 정보처리학회논문지D
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• 제9D권2호
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• pp.313-322
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• 2002

멀티미디어 회의는 크게 밀결합 회의와 소결합 회의로 구분되며, 전자의 경우는 ITU-T의 H.323 표준에 근거한 일대일 또는 다자간 멀티미디어 회의가 있고, 후자의 경우로는 H.323 표준을 확장한 ITU-T의 H.332 표준이 있다. H.332 표준을 근거로 한 소결합 멀티미디어 회의는 송수신 능력을 갖는 소수의 패널과 수신능력 만을 갖는 다수의 청중들로 이루어진다. H.332에서는 참가자가 다수일 때 능력교환의 어려움을 극복하기 위해 회의의 주제나 미디어 형식등을 회의가 열리기 전에 미리 알리며 이를 위해 IETF의 SDP를 이용한다. 이와 같은 방법으로 H.323 멀티미디어 회의의 단점인 확장성을 극복할 수 있다. 본 논문에서는 소결합 멀티미디어 회의를 위하여 표준화되고 있는 H.332를 분석하고, 분석된 결과를 토대로 구현된 시스템을 소개한다.

• 치과방사선
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• 제28권2호
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• pp.461-470
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• 1998

The comparative detectability of the artificial periapical defects among Ektaspeed Plus film. digitized and digora images was evaluated. The artifical defects were made in the cancellous bone and cancellous-cortical junction with the size of 1.0×0.8mm², 1.4×1.1mm² and 2.8×2.2mm². The defects in cancellous-cortical junction extended into cortical bone with the depth of 0, 0.5 and 1.0 mm. The results were as follows : 1. In junctional defects Ektaspeed Plus film for 2.8×12.2mm² defect showed the highest detectability. But significant difference were only found between Ektaspeed Plus films and digitized images (p<0.05). 2. Almost all defects within cacellous bone were not detected except a few digitized and Digora images for the size of 2.8×2.2mm². Digora images for them showed significant differences with Ektaspeed Plus films and digitized images (p<0.05). 3. The sensitinity of all imaging modalities were 0.9 or 1.0 in junctional defects for the size of 1.4×2.2mm² and 2.8×2.2mm². For cancellous defects, Digora image showed the highest sensitivity of 0.6 for the size of 2.8×2.2mm². 4. Significant differences for change of exposure time were found in most group of Ektaspeed Plus films and digitized images (p<0.05) . But there was no significant differences in Digora images for cacellous defects.

• 한국정밀공학회지
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• 제26권11호
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• pp.108-115
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• 2009

In metal forming technologies, the stamping process is one of the significant manufacturing processes to produce sheet metal components. It is important to design stamping process which can produce sound products without defect such as fracture and wrinkle. The objective of this study is to propose the feasible formability diagram which denotes the safe region without fracture and wrinkle for effective design of stamping process. To determine the feasible formability diagram, FE-analyses were firstly performed for the combinations of process parameters and then the characteristic values for fracture and wrinkle were estimated from the results of FE-analyses based on forming limit diagram. The characteristic values were extended through training of the artificial neural network. The feasible formability diagram was finally determined for various combinations of process parameters. The stamping process of turret suspension to support suspension module was taken as an example to verify the effectiveness of feasible formability diagram. The results of FE-analyses for process conditions within fracture and wrinkle as well as safe regions were in good agreement with experimental ones.

• Tribology and Lubricants
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• 제31권3호
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• pp.109-124
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• 2015

This paper presents a wear analysis procedure for the journal bearings on a stripped-down single-cylinder engine during start-up and coast-down by motoring. A journal bearing is in the mixed elastohydrodynamic (EHL) lubrication region when the shaft speed is less than the corresponding lift-off speed. Below the lift-off speed, a wear scar can form on bearing surfaces. In part 1 of this paper, we develop the appropriate formulations and the calculation procedure for the analysis. Specifically, we formulate an equation for modified film thickness in a journal bearing considering the additional wear volume. In order to obtain the modified specific wear rate induced by the modified Archard’s wear coefficient, we utilized the extended non-dimensional diagram for the specific wear rate, k, the fractional film defect coefficient, Ψ and the asperity load sharing factor, γ₂. This asperity load sharing factor is newly calculated by setting the Zhao-Maietta-Chang (ZMC) asperity contact pressure equation coupled with the central film thickness equation derived by using the ZMC asperity contact model equal to the modified central contact pressure derived by using the central (or maximum) contact pressure at the dry rough line-contact configuration. We can use the procedure introduced in this paper to determine the lifetime (or longterm) linear wear in radial journal bearings that is a result of repeated stop-start cycles.

• 품질경영학회지
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• 제48권2호
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• pp.297-307
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• 2020

Purpose: The purpose of this study is to analyze the factors that affect ammunition performance by applying data mining techniques to the Ammunition Stockpile Reliability Program (ASRP) data of the 155mm propelling charge. Methods: The ASRP data from 1999 to 2017 have been utilized. Logistic regression and decision tree analysis were used to investigate the factors that affect performance of ammunition. The performance evaluation of each model was conducted through comparison with an artificial neural networks(ANN) model. Results: The results of this study are as follows; logistic regression and the decision tree analysis showed that major defect rate of visual inspection is the most significant factor. Also, muzzle velocity by base charge and muzzle velocity by increment charge are also among the significant factors affecting the performance of 155mm propelling charge. To validate the logistic regression and decision tree models, their classification accuracies have been compared with the results of an ANN model. The results indicate that the logistic regression and decision tree models show sufficient performance which conforms the validity of the models. Conclusion: The main contribution of this paper is that, to our best knowledge, it is the first attempt at identifying the significant factors of ASPR data by using data mining techniques. The approaches suggested in the paper could also be extended to other types ammunition data.