• Journal of Chest Surgery
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• 제54권3호
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• pp.186-190
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• 2021

Background: Pre-lifting of the sternum marked a major turning point in pectus excavatum repair. The author developed the crane technique in 2002 and successfully applied it to more than 2,000 cases using sternal wire stitching. However, blind sternal suturing limited the use of the wire-stitch crane. We propose a novel screw for sternal lifting as a new tool for the crane technique. Methods: We developed a screw system strong enough to withstand the pressure needed for sternum lifting. The screw was designed to have a broader thread to hold the bony tissue securely. The screw's sustaining power was tested using the torsion, driving torque, and axial pull-out tests in a polyurethane block and ex-vivo porcine sternum. Results: The screws were easily driven into the sternum, and the head of the screw was connectable to the table-mounted retractor. In the torsion test, the 2° offset torsional yield was 4.53 N·m (reference value, 1 N·m). In the polyurethane block driving torque test, the maximum torque was 0.98 N·m (reference value, 0.70 N·m). The axial pull-out test was 446 N (reference value, 100 N). The maximum pull-out resistance in the ex-vivo porcine sternum model was 1,516 N. Conclusion: The screw crane was strong enough to sustain the chest wall weight to be lifted. Thus, the screws could effectively replace the sternal wire stitching in crane pre-lifting of the sternum. We expect that application of the screw-crane will be easy and that it will improve the safety and success rate of pectus repair surgery.

• 대한관절경학회지
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• 제10권1호
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• pp.83-86
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• 2006

목적: 삼각 섬유연골 복합체의 병변 중 Palmer 분류상 1B형에 대해 관절경적 봉합술을 시행하고 그 결과와 수술 술기를 보고하고자 한다. 대상 및 방법: 2001년부터 2004년까지 삼각 섬유연골 복합체의 병변으로 수술을 시행한 환자 중 1B형으로 봉합술을 시행한 9례를 대상으로 하였다. 평균 추시기간은 28개월이었으며, 남자가 6례, 여자가 3례, 우측이 7례, 좌측이 2례였다. 관절경적 변연 절제술 및 outside-in 방법으로 봉합술을 시행하였다. 임상적 결과 판정은 통증에 대한 주관적 시각 척도, 완관절의 근력, 운동 범위를 이용하였다. 결과: 통증에 대한 주관적 시각 척도는 수술 전 6.2에서 수술 후 1.4점으로 감소하였다. 모든 환자에서 수근 관절의 근력이 수술 전에 비해 호전 되었고 관절 운동 범위가 전범위 가능한 상태로 호전 되었다. 결론: 1B형 삼각 섬유연골 복합체의 병변에 대해 관절경적 봉합술을 시행하여 좋은 결과를 보였으며 outside-in 방법을 이용한 봉합술은 술식이 간단하고 만족스런 고정력을 얻을 수 있었다.

• 대한관절경학회지
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• 제9권1호
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• pp.40-45
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• 2005

목적: 본 연구의 목적은 내측 반월상 연골 후방 골 기시부 파열 환자의 임상적 특징과 골 기시부 봉합술 및 그 임상 결과를 알아보고자 한다. 대상 및 방법 2003년 9월부터 2004년 8월까지 본원에서 내측 반월상 연골 후방 골 기시부 파열로 진단받은 환자 27명을 대상으로 하였고 이 중 23명은 봉합술을 시행하였다. 평균 연령은 60.2세였다. 봉합술은 골 기시부 처리시 전외측 창을 이용한 1군(14예)과 후내측 창을 함께 이용한 2군(9예)으로 나누었다. 동반된 관절 연골 손상은 ICRS system을, 술 후 임상결과는 Lvsholm Knee Score를 이용하였다. 결과: 최종 추시상 Lysholm Knee Score는 1군이 77.1점(범위; $58{\sim}97$점), 2군이 81.4점(범위; $72{\sim}94$점)이었다(p>0.05). 봉합술이 실패한 경우는 23예 중 4예였다. 1군은 3예로 반월상 연골 부분 절제술로 치료하였으며 2군은 1예로 장력이 소실되었으나 관찰 중이다. 관절연골 병변은 20예에서 체중 부하 부위에 있었고 Outerbridge 분류상 III기 8예, IV기 5예였다. 결론: 내측 만월상 연골 골 기시부 파열에서 pull-out 봉합술이 원주 테 장력을 복원하고 관절염을 예방하는 데 유용한 치료라고 사료된다.

• International Journal of Quality Innovation
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• 제5권1호
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• pp.1-9
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• 2004

The nonhomogeneous poisson process (NHPP) is often used to model repairable systems that are subject to a minimal repair strategy, with negligible repair times. In this situation, the system can be characterized by its intensity function. There have been many NHPP models according to intensity functions. However, the intensity function of system in use can be changed because of repair or its aging. We consider the single change point model as the modification of the power law process. The shape parameter of its intensity function is changed before and after the change point. We detect the presence of the change point using Bayesian methodology. Some numerical results are also presented.

• 한국경영과학회지
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• 제25권4호
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• pp.27-44
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• 2000

In this study we consider a spares provisioning problem for repairable items in which a parts inventory system is incorporated. If a machine fails, a replacement part must be obtained at the parts inventory system before the failed machine enters the repair center. The inventory policy adopted at the parts inventory system is the (S, Q) policy. Operating times of the machine before failure, ordering lead times and repair times are assumed to follow a two-stage Coxian distribution. For this system, we develop an approximation method to obtain the performance measures such as steady state probabilities of the number of machines at each station and the probability that a part will wait at the parts inventory system. For the analysis of the proposed system, we model the system as a closed queueing network and analyze it using a product-form approximation method. A recursive technique as well as an iterative procedure is used to analyze the sub-network. Numerical tests show that the approximation method provides fairly good estimation of the performance measures of interest.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.159-164
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• 2004

Recently the unexpected damage is broken out by the unusal change of weather. Misfortune on top of misfortune the typhoon did great damage again before finishing the repair work. And then we should study about the repair work of fast and safety as well as the construction of safety. The paper suggests the case study of a fast disaster restoration work. To minimise the term of repair work which selects Fast Track Method. This work is processed as follows. Temporary resortation is progressed at the same time as the main resortation. And In this paper, technique to evaluate the capacity of bridge is tried to develop by means of FEM analysis.

• Earthquakes and Structures
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• 제15권2호
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• pp.165-178
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• 2018

The aim of this study is to investigate the efficiency of using threaded rods and steel profiles to produce a steel confining system for rehabilitation of damaged concrete corbels for the first time in literature. Some of the specimens were repaired by crack repair epoxy before being confined for further enhancement. A total of 19 two sided damaged corbels were used in the study with different mechanical properties and parameters but similar dimensions. The differences were in rehabilitation style, shear span, fiber percentage, reinforcement steel diameter, and concrete strength. The rehabilitated specimens were loaded with vertical load until failure. Four different configurations were used in the investigation. Test results show that the proposed rehabilitation technique is effective to enhance the load capacity of the corbels and to improve their ductility. Moreover, new formulations were proposed to calculate the load capacity of the rehabilitated corbels. A good fit was observed between numerical and experimental results.

• Journal of Chest Surgery
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• 제21권2호
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• pp.326-333
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• 1988

The results of surgical experience of double outlet right ventricle with pulmonic stenosis in 14 patients are reported. Among the 14 patients, 8 underwent the intraventricular tunnel repair with the result of 3 hospital deaths, 5 had Fontan type operations due to the various anatomic reasons and resulted in one hospital death, and the remaining one patient had palliative pulmonary valvotomy. Besides the problems related to the effective relief of the pulmonic stenosis, double outlet right ventricle with pulmonic stenosis may present a surgical challenge because severe associated anomalies which definitely complicate their repair are not uncommon. We describe the anatomic details of our 14 cases of DORV with PS and the surgical results. The results having been unsatisfactory, more meticulous diagnostic studies for the detailed intracardiac morphologies and the strict indication for their repair with the refinement of surgical technique seem necessary for the better surgical results.

• Journal of Ginseng Research
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• 제16권3호
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• pp.210-216
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• 1992

The effect of saponin extracted from Panax grneng CA Meyer on DNA repair and replicative DNA synthesis were examined in CHO-Kl cells cotreated with benzo(a)pyrene and rat liver S-15 fraction. The DNA strand breaks inititated by benzo(a)pyrene metabolites were measured by alkaline election technique. The addition of ginseng saponin to the culture media resulted in decrease of benzo(a)pyrene-induced DNA strand breaks, and restored the suppressed-semiconservative-DNA-synthesis by the carcinogen. DNA repair synthesis in the damaged cells was also elevated by the ginseng treatment when the repairing activites were measured for the (3H)-thymidine incorporation into the carcinogen damaged cellular DNk Comparative analysis of DNA-adduces of benzo(a)pyrene metabortes in microsomes suggested that ginseng saponin treatment in rats reduced the formation of electrophilic metabolites of benzo (a)-pyrene in the rat liver microsomes.

• 한국해양공학회지
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• 제22권3호
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• pp.89-95
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• 2008

Fatigue cracked components often needs to be repaired during service. Standard repair schemes involve strengthening the component by connecting reinforcing members by means of rivets or welding by reducing the crack-tip stress intensity factors. Recent technological advances in fiber reinforced composite materials and adhesive bonding have led to the development of efficient repair schemes. In this study, the influence of various shape parameters on fatigue crack growth in the CCT type uniform thickness plates and the thin-ta-thick type stiffened panels repaired with woven fabric type Kevlar-Epoxy composite patch are studied experimentally.