• 대한두개안면성형외과학회지
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• 제23권3호
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• pp.119-124
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• 2022

Background: Many severe nasal bone fractures present with septal fractures, causing postoperative septal deviation and negatively affecting the patients' quality of life. However, when a septal fracture is absent, it is difficult to predict whether surgical correction can help minimize nasal septal deviation postoperatively. This study determined whether performing closed reduction on even mildly displaced nasal bone fracture could deter the outcome of septal deviation. Methods: We retrospectively reviewed the data of 116 patients aged 21-72 years who presented at the outpatient clinic and emergency room with fractures of nasal bones only without any involvement of the septum from January 2014 to December 2020. Patients were classified into three fracture type groups: A (unilateral), B (bilateral), and C (comminuted with depression). The degree of septal deviation was calculated by measuring the angle between the apex of the most prominent point and the crista galli in the coronal view on computed tomography images. The difference between the angles of the initial septal deviation and that of the follow-up was calculated and expressed as delta (Δ). Results: Closed reduction tended to decrease the postoperative septal deviation in all fracture types, but the values were significantly meaningful only in type A and B fractures. In the surgical group, with type A as the baseline, type B showed a significantly larger Δ value, but type C was not significantly different, although type C showed a smaller Δ value. In the conservative group, with type A as the baseline, the other fracture types presented significantly lower Δ values. Conclusion: For all fracture types, closed reduction significantly decreased the extent to which the nasal septum likely deviated. Therefore, when a patient is reluctant to undergo closed reduction, physicians should address the possible outcomes and prognosis of untreated nasal bone fractures.

• 한국잠사곤충학회지
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• 제25권1호
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• pp.44-50
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• 1983

現 生絲檢査規則 中 纖度偏差檢査項目에 관하여 檢討한 結果 약간의 矛盾點을 發見하였으므로 이를 지적하고 그 改善策을 設定하였다. 1. 現 纖度偏差檢査는 平均纖度가 50~69 denier에 標準偏差는 5.80以下, 4.61 以上일 때 A格으로 定하고 있으나 平均纖度 50 denier인 경우의 標準偏差 5.80과 平均纖度 69 denier인 경우의 標準差 5.80과는 同一分布라 할 수 없다. 2. C.V로 換算하여 볼 때 2A格의 C.V가 A格의 C.V보다 작아야 하는데 現 纖度檢査規定은 70denier 의 1A格의 C.V換算値는 9.00이며, 69denier의 A格의 C.V換算値는 8.41로서의 70denier 2A格이 69denier의 A格보다 變異의 分散이 크게 나타나는 矛盾點을 보였다. 3. 生絲의 纖度偏差檢査數値도 平均値가 다른 Sample끼리의 優劣을 나타내는 數値이며 이 數値로서 等級을 決定하기 때문에 標準偏差에 의하여 檢査할 것이 아니라 C. V에 의하여 檢査하여야 한다. 4. 33 denier 以上의 生絲에서 각 等級別로 볼 때 6A格에서 下位格으로 감에 따라 變異폭(變異係數)을 약간씩 크게 하였으나 곳에 따라 一貫性을 잃고 있으며 그리고 同一等級에서 纖度變化에 따른 變異係數數値의 變化도 같은 경향이므로 等級間 및 纖度間의 數値調整을 要한다. 5. 34 denier 以上에서는 標準偏差數 値를 代入하기 때문에 同一等級에서 平均纖度가 굵어짐에 따라 標準偏差數値를 크게 하였으나 C. V로 換算하여 보면 大同小異하므로 纖度變化에 따른 C. V數値를 달리 할 필요가 없다. 6. 以上의 1.2.3.4.5項의 矛盾點을 是正하기 위하여 是正하기 위하여 C.V에 의한 檢査方式을 導入하고 33denier 以上에서 각 纖度間과 각 等級間의 均衡을 바로 잡으며 또 34 denier 以上에서 각 等級間의 間隔을 바로 잡기 위하여 曲線回歸公式을 導入하여 調整할 必要가 있다. 7. 生絲檢査에서 纖度偏差檢査表를 다음과 같이 改正實施함이 보다 妥當하다.

• The Journal of Advanced Prosthodontics
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• 제6권1호
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• pp.39-45
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• 2014

PURPOSE. The aim of the present study was to evaluate the accuracy of three techniques for correction of cast implant bars. MATERIALS AND METHODS. Thirty cast implant bars were fabricated on a metal master model. All cast implant bars were sectioned at 5 mm from the left gold cylinder using a disk of 0.3 mm thickness, and then each group of ten specimens was corrected by gas-air torch soldering, laser welding, and additional casting technique. Three dimensional evaluation including horizontal, vertical, and twisting measurements was based on measurement and comparison of (1) gap distances of the right abutment replica-gold cylinder interface at buccal, distal, lingual side, (2) changes of bar length, and (3) axis angle changes of the right gold cylinders at the step of the post-correction measurements on the three groups with a contact and non-contact coordinate measuring machine. One-way analysis of variance (ANOVA) and paired t-test were performed at the significance level of 5%. RESULTS. Gap distances of the cast implant bars after correction procedure showed no statistically significant difference among groups. Changes in bar length between pre-casting and post-correction measurement were statistically significance among groups. Axis angle changes of the right gold cylinders were not statistically significance among groups. CONCLUSION. There was no statistical significance among three techniques in horizontal, vertical and axial errors. But, gas-air torch soldering technique showed the most consistent and accurate trend in the correction of implant bar error. However, Laser welding technique, showed a large mean and standard deviation in vertical and twisting measurement and might be technique-sensitive method.

• Clinical and Experimental Otorhinolaryngology
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• 제11권4호
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• pp.275-280
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• 2018

Objectives. Middle vault deviation has a significant effect on the aesthetic and functional aspects of the nose, and its management continues to be a challenge. Spreader graft and its modification techniques have been focused, but there has been scarce consideration for removing surplus portion and balancing the upper lateral cartilage (ULC). This study aimed to report the newly invented triangular-shaped resection technique ("triangular resection") of the ULC and to evaluate its efficacy for correcting middle vault deviation. Methods. A retrospective study included 17 consecutive patients who presented with middle vault deviation and underwent septorhinoplasty by using triangular resection at a tertiary academic hospital from February 2014 and March 2016. Their outcomes were evaluated pre- and postoperatively including medical photographs, acoustic rhinometry and subjective nasal obstruction using a 7-point Likert scale. Results. The immediate outcomes were evaluated around 1 month after surgery, and long-term outcomes were available in 12 patients; the mean follow-up period was 9.1 months. Nasal tip deviation angle was reduced from $5.66^{\circ}$ to $2.37^{\circ}$ immediately (P<0.001). Middle vault deviation also improved from $169.50^{\circ}$ to $177.24^{\circ}$ (P<0.001). Long-term results were $2.49^{\circ}$ (P=0.015) for nasal tip deviation and $178.68^{\circ}$ (P=0.002) for middle vault deviation. The aesthetic outcome involved a complete correction in eight patients (47.1%), a minimally visible deviation in seven patients (41.2%) and a remaining residual deviation in two patients (11.8%). Pre- and postoperative minimal cross-sectional areas (summation of the right and left sides) were 0.86 and 1.07, respectively (P=0.021). Fifteen patients answered about their nasal obstruction symptoms and the median symptom score had alleviated from 6.0 to 3.0 (P=0.004). Conclusion. Triangular resection of the ULC is a simple and effective method for correcting middle vault deviation and balancing the ULCs without complications as internal nasal valve narrowing.

• Restorative Dentistry and Endodontics
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• 제37권3호
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• pp.165-169
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• 2012

Closure of interdental spaces using proximal build-ups with resin composite is considered to be practical and conservative. However, a comprehensive approach combining two or more treatment modalities may be needed to improve esthetics. This case report describes the management of a patient with multiple diastemas, a peg-shaped lateral incisor and midline deviation in the maxillary anterior area. Direct resin bonding along with orthodontic movement of teeth allows space closure and midline correction, consequently, creating a better esthetic result.

• 대한기계학회논문집B
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• 제32권3호
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• pp.235-240
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• 2008

The large size electromagnetic flowmeter was tested to investigate the variation of its error characteristics in the range of low velocity under 0.6 m/s using flowmeter calibration system. For the two case of valve opening rate 100 % and 50 %, these tests were undertaken three times each for twelve velocity condition from $0.05\;^m/s\;to\;0.6\;^m/s$ with increment of $0.05\;^m/s$. It is shown that error characteristic of electromagnetic flowmeter was stabilized within ${\pm}0.4%$ of rate both higher than $0.25^m/s$ of velocity condition and 50 % of valve opening position. But, measurement deviation of flowmeter for ${\Phi}400mm\;and\;{\Phi}600mm$ was out of expected deviation range. It is necessary to correction with calibration. In conclusion, error characteristic of electromagnetic flowmeter wasn't changed proportion to its size.

• Nuclear Engineering and Technology
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• 제55권2호
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• pp.734-748
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• 2023

A comprehensive investigation of the Ronen method is performed in homogeneous and heterogeneous slab problems from the Sood benchmark, considering isotropic and linearly-anisotropic problems. Three finite differences implementations are exercised and compared. The results are compared to reference solutions using one and two energy groups. The validation is performed for the criticality eigenvalue and the fundamental neutron flux distribution. The results demonstrate the significantly improved accuracy achievable by the Ronen method using a broad set of problems. For standard convergence tolerances, the maximal deviation in criticality eigenvalue is less than ten pcm, and the maximal deviation in the spatial distribution of the flux is less than 2%, always located near sharp interfaces or vacuum boundaries.

• 항공우주기술
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• 제7권2호
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• pp.27-30
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• 2008

풍동시험의 벽면효과 보정방법이 풍동시험 조건에서 수행된 전산해석결과에 적용되었다. 보정을 마친 양력계수는 벽면이 없는 조건에서 수행된 전산해석 결과와 잘 일치하지만 보정된 항력계수는 벽면효과가 제거된 결과와 약간의 차이를 보인다.

• Journal of electromagnetic engineering and science
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• 제12권1호
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• pp.85-93
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• 2012

We propose a new expression of the near-field gain correction to calculate the on-axis far-field gain from the onaxis near-field gain for a directive antenna. The new expression is represented by transversal vectorial transmitting characteristics of two antennas that are measured by planar near-field equipment. Due to the advantages of the photonic sensor, the utilization of the new expression realizes the measurements of the on-axis far-field gains for two kinds of double ridged waveguide horn antennas within 0.1 dB deviation from 1 GHz to 6 GHz without calibrating the photonic sensor system.

• 한국음향학회:학술대회논문집
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• 한국음향학회 2004년도 추계학술발표대회논문집 제23권 2호
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• pp.283-286
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• 2004

Due to advances in electronics very high quality audio reproduction is today possible. But the listening environment causes deviation of the audio system from the expected behavior. Firstly the listening Room significantly changes the audio signal frequencies and their phase. Secondly the position of the user in the room affects the perceived sound. With existing DSP technology it is possible to adequately correct these effects. In our work we developed a room correction system, correcting up to 7.1 channels using dual Motorola 56367 fixed point DSP's, implementing position dependent room effects measurement, real time compensation filter design and equalization filtering procedures.