• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제40권1호
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• pp.17-20
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• 2014

Objectives: The aim of this study was to retrospectively evaluate the clinical survival rate of Astra Tech implants in the maxillary molar region performed with sinus lift and bone graft. Materials and Methods: Ninety-nine Astra Tech implants (Osseospeed) placed in the maxillary molar region using sinus lift from September 2009 to February 2012 were selected with a minimum follow-up period of 1 year. The height of alveolar bone, sinus approach technique, bone material and implant survival rate were evaluated. Results: Of the 99 implants, the survival rate was 90.9%; 8 implants failed within 1 year after implant placement, and 1 implant failed 1 year after implant loading. All failed implants were placed with sinus lift simultaneously. The average height of alveolar bone before implant placement was 6.9 mm, while the height of alveolar bone of failed implants was 2.1 mm, on average. Conclusion: Astra Tech implants placed in the maxillary molar region had generally good survival rates, but the relationship between reduced pre-implant alveolar bone height and implant failure requires further attention.

• 척추신경추나의학회지
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• 제5권2호
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• pp.57-68
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• 2010

Objectives : The propose of this study is to find out the clinical application of conservative treatment for Failed Back Surgery Syndrome(FBSS) patients. Methods : We examined 3 patients with Failed Back Surgery Syndrome(FBSS) who visited Jaseng Hospital of Oriental Medicine. We used Acupuncture, Bee venom, CHUNA manual therapy, Herbal medication for this patient. And we measured of NRS score to evaluate the conservative treatment effects. Results : In this study, patients sciatica and symptoms has improved. NRS score were also decreased. Conclusions : Conservative oriental medical treatment can be effective for improving symptoms of Failed Back Surgery Syndrome.

• 과학기술학연구
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• 제9권2호
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• pp.51-78
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• 2009

실패한 기술은 대체로 성공을 위한 끊임없는 도전 중에 발생하는 몇 차례의 필연적인 시행착오의 과정으로 그려지거나 혹은 성공한 기술과 대비시켜, 애초부터 실패할 조건들을 가진 일종의 병리적 기술로 취급된다. 이렇듯 실패라는 결과를 통해 재구성된 서술들은 흔히 실패한 기술이 한때 다양한 행위자들과 관계 맺으며 복잡한 기술 네트워크를 구성했었다는 사실을 망각한다. 결국 실패한 기술은 기술 구현에 실패했을 뿐 아니라 기술사에서 정당한 평가를 받는데도 실패하는 경우가 많다. 이 글은 한국 정보 통신 산업에서 가장 대표적인 실패로 기억되는 시티폰 프로젝트를 한국 정보 통신 산업의 토양 위에서 시작에서 종결까지 전 과정을 추적해, 시티폰 프로젝트가 구성했던 기술 네트워크를 복원하고자 시도한다. 이를 통해, 처음부터 저렴한 가격, 낮은 기술을 지향했던 시티폰 프로젝트가 다양한 행위자들의 이해관계가 만나는 지점에서 한시적으로나마 안정된 기술 네트워크를 구성했으며, 이후 각 행위자들의 기술에 대한 의미부여가 달라지면서 변화했음을 확인할 수 있을 것이다. 또한 실패로 종결된 시티폰 기술 네트워크의 붕괴가 기술적 한계보다는 기술표준에 대한 불확실성, 우발적 환경 변화에 기인한 것임을 보일 수 있을 것이다.

• The Korean Journal of Pain
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• 제14권1호
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• pp.104-109
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• 2001

We describe the accidental injection of local anesthetics containing steroid into the subdural space during an attempted lumbar epidural injection for intractable radiculopathy in a patient with failed back surgery syndrome. A 24-year-old man complained of severe radiating pain to left lower extremity and showed a walking disturbance and severe lumbar scoliosis. The MRI finding was a left paramedian recurred disc herniation on L4-5 in a laminectomy state. Several therapeutic modalities such as epidural steroid injection, transforaminal injection, L2 root block, medication, and exercise therapy, etc failed. Initially, during epidural block at L4-5 under fluoroscopic guidance, a railroad track appearance appeared on epidurogram suggesting the presence of a subdural space. A second epidural block was tried at L5-S1. Following confirmation of epidural space upon epidurogram, 6 ml of 0.5% lidocaine including triamcinolone 40 mg was injected. The patient showed signs of the subdural injection including an unexpectedly high sensory block (T2) and a motor weakness of both lower extremities. Following this event, the severe radiculopathy and lumbar scoliosis were improved. Therefore, we conclude that subdural injection of steroid could be helpful in intractable radiculopathy, especially in the failed back surgery syndrome. However, it must be used cautiously with careful patient selection.

• 척추신경추나의학회지
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• 제6권2호
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• pp.23-32
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• 2011

본 논문은 3차례의 양방적 수술 치료를 받은 후에도 지속적으로 요통과 함께 하지 방사통을 호소하며 일상생활 수행에 장애가 따르던 70세 여환에 대한 증례로 침구치료, 약물치료, 추나치료, 봉약침치료 등의 한의학적 보존적 치료방법으로 통증의 감소와 함께 일상생활 능력 개선에 유의한 효과를 보였다. 향후 요추 추간판 탈출증 환자의 한방적 보존적 치료에 대한 보다 다양한 연구와 임상적 고찰이 이루어져야 한다고 사료된다.

• Clinical and Experimental Reproductive Medicine
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• 제24권3호
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• pp.319-324
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• 1997

Despite the direct placement of sperm within the oocyte, fertilization failure still occurs after ICSI. This study was accomplished to analyze the chromosomes in oocytes failed to fertilize after ICSI comparing to oocytes failed to fertilize by conventional in vitro insemination. Seventy-four ICSI cycles and 122 conventional IVF cycles were included in analysis. Included unfertilized oocytes were from 74 patients (mean age = $32.7{\pm}3.7$). Ninety-three oocytes were informative and 83 oocytes were legible for cytogenetic analysis. Sixty-two oocytes out of 83 (74.7%) had normal chroruosomes, while 15 (18.1%) were hypoploidy, 6 (7.2%) were hyperploidy. Eighteen oocytes out of 93 (17.6%) were premature chromosome condensation (PCC). Two hundred ninety-four unfertilized oocytes after conventional insemination were subjected to chromosomal analysis and 180 oocytes were legible for analysis. One hundred thirty-two oocytes out of 180 (73.3%) were normal, while 22 (12.2%) were hypoploidy, 20 (11.1%) were hyperploidy, and 6 (3.3%) were polyploidy. Twenty-two oocytes (12.2%) were PCC. There was no difference in chromosomes between oocytes that failed to fertilize after ICSI or conventional insemination. High PCC rates in fertilization-failed oocytes suggest that oocytes maturity is another important factor in achieving successful fertilization.

• Steel and Composite Structures
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• 제33권1호
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• pp.37-66
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• 2019

In cold-formed steel structures, such as trusses, wall frames and portal frames, the use of back-to-back built-up cold-formed stainless-steel lipped channels as compression members are becoming increasingly popular. The advantages of using stainless-steel as structural members are corrosion resistance and durability, compared with carbon steel. The AISI/ASCE Standard, SEI/ASCE-8-02 and AS/NZS do not include the design of stainless-steel built-up channels and very few experimental tests or finite element analyses have been reported in the literature for such back-to back cold-formed stainless-steel channels. Current guidance by the American Iron and Steel Institute (AISI) and the Australian and New Zealand (gAS/NZS) standards for built-up carbon steel sections only describe a modified slenderness approach, to consider the spacing of the intermediate fasteners. Thus, this paper presents a numerical investigation on the behavior of back-to-back cold-formed stainless-steel built-up lipped channels. Three different grades of stainless steel i.e., duplex EN1.4462, ferritic EN1.4003 and austenitic EN1.4404 have been considered. Effect of screw spacing on the axial strength of such built-up channels was investigated. As expected, most of the short and intermediate columns failed by either local-global or local-distortional buckling interactions, whereas the long columns, failed by global buckling. All three grades of stainless-steel stub columns failed by local buckling. A comprehensive parametric study was then carried out covering a wide range of slenderness and different cross-sectional geometries to assess the performance of the current design guidelines by AISI and AS/NZS. In total, 647 finite element models were analyzed. From the results of the parametric study, it was found that the AISI & AS/NZS are conservative by around 10 to 20% for cold-formed stainless-steel built-up lipped channels failed through overall buckling, irrespective of the stainless-steel grades. However, the AISI and AS/NZS can be un-conservative by around 6% for all three grades of stainless-steel built-up channels, which failed by local buckling.

• Hip & pelvis
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• 제35권2호
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• pp.108-121
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• 2023

Purpose: The primary objective of the current study is to demonstrate the trochanteric wiring technique. A secondary objective is to evaluate the clinico-radiological outcomes of use of the wiring technique during primary arthroplasty for treatment of unstable and failed intertrochanteric fractures. Materials and Methods: A prospective study including follow-up of 127 patients with unstable and failed intertrochanteric fractures who underwent primary hip arthroplasty using novel multi-planar trochanteric wiring was conducted. The average follow-up period was 17.8±4.7 months. Clinical assessment was performed using the Harris hip score (HHS). Radiographic evaluation was performed for assessment of union of the trochanter and any mechanical failure. P<0.05 was considered statistically significant. Results: At the latest follow-up, the mean HHS showed significant improvement from 79.9±1.8 (at three months) to 91.6±5.1 (P<0.05). In addition, no significant difference in the HHS was observed between male and female patients (P=0.29) and between fresh and failed intertrochanteric fractures (P=0.08). Union was achieved in all cases of fractured trochanter, except one. Wire breakage was observed in three patients. There were five cases of limb length discrepancy, three cases of lurch, and three cases of wire-related bursitis. There were no cases of dislocation or infection. Radiographs showed stable prosthesis in situ with no evidence of subsidence. Conclusion: Use of the proposed wiring technique was helpful in restoring the abductor level arm and multi-planar stability, which enabled better rehabilitation and resulted in excellent clinical and radiological outcomes with minimal risk of mechanical failure.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2003년도 사면안정학술발표회
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• pp.129-144
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• 2003

Generally, investigation methods of cut slope are conducted only geological surface survey to gain engineering geological data of cut slopes. These methods have many problems such as limitations of investigation for a special area. So geophysical investigations such as geotomography, seismic and electrical resistivity methods have been used to search for failure surface in potential failure slopes or failed slopes. But investigation method using the borehole camera is recently a used method and it is thought that this method is more reliable method than other investigation methods because of being able to see by the eyes. Therefore, this paper was conducted investigations of borings and BIPS(Borehole Image Processing System) to search for potential sliding surfaces and was applied to obtain information of discontinuity on failed and potential failure slope in highway. As the results of BIPS, we could decide potential sliding surface in the slope, conducted to check slope stability and decided slope stability measures.

• Applied Science and Convergence Technology
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• 제24권5호
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• pp.142-150
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• 2015

A failure analysis of tungsten filaments used in quadrupole mass spectrometer for plasma process monitoring was carried by using SEM and EDS. Failed at high temperature, filaments showed two kinds of failure modes. The one is that diameter of filament became thinner gradually and finally snapped. The other is that filament abruptly snapped almost at a right angle. The EDS analysis showed Fe and C, including W and Fe, on the surface of failed filament. when failed filaments were treated with plasma in mixture of Ar and $CF_4$, the amount of Fe and C decreased. The failure analysis of filament showed that the cause of filament failure is thermal evaporation and grain growth of tungsten at high temperature.