• Clinics in Shoulder and Elbow
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• v.13 no.1
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• pp.64-71
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• 2010

Purpose: To evaluate pathologic patterns and outcomes of treatment of a biceps tendon lesion associated with a rotator cuff tear. Materials and Methods: We reviewed 92 patients (i) who underwent surgery for a cuff tear, (ii) for whom the biceps lesion could be observed retrospectively, and (iii) had a minimum follow-up of 2 years. The pathology of biceps tendon was classified into 4 types: tenosynovitis, fraying or hypertrophy, tear, and instability. All but the 4 with massive cuff tears were repaired. The biceps lesions were treated with debridement in 30, tenotomy in 10, tenodesis in 8, and recentering in 4. UCLA scoring was used for clinical results. Results: Seventy patients had a biceps lesion, 19 tenosynovitis, 22 fraying or hypertrophy, 21 a tear, and 8 instability. A biceps lesion was observed in 63% of cases of cuff tears below the medium size, and in 88% of cases with cuff tears above the large size. UCLA scores according to the pathology of the biceps lesion were 29.6 in the absence of a biceps lesion, and 28.3 in its presence. UCLA scores in patients with tenotomy or tenodesis for associated biceps tendon lesions were 28.2. Conclusion: There is a greater incidence and severity of a biceps lesion with a larger cuff tear. Therefore, the cause of a biceps lesion might be related to the cause of the cuff tear. Among the several options of treatment for biceps lesion, tenotomy or tenodesis may be particularly effective in providing pain relief.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.23 no.5
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• pp.415-421
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• 2001

The present study was carried out to compare the postoperative results of Cronin triangular flap and Millard rotation-advancement repair techniques in repairing the unilateral complete cleft lip. Thirteen patients with unilateral complete cleft lip underwent 6 Cronin triangular flap and 7 Millard rotation-advancement repairs at the Department of Oral and Maxillofacial Surgery of Chonnam University Hospital over a period of 6 years (January 1994 to December 1999). The surgical results following the operation were assessed on the basis of scoring, vertical lip length and scar hypertrophy. The mean score was better in Cronin triangular flap group($74.77{\pm}0.86$) than in Millard rotation-advancement group($66.50{\pm}1.14$) for both lip and nose segments. Scar hypertrophy developed in the Millard rotation-advancement repair group with 28.6% incidence but not in the Cronin triangular flap group. No significant difference was found in the ratio of lip length between Millard rotation-advancement repair and Cronin triangular flap groups($0.73{\pm}0.10$ and $0.80{\pm}0.96$). These results suggest that Cronin triangular flap shows better results than Millard rotation-advancement repair in repairing the unilateral complete cleft lip.

• Journal of the Korean Arthroscopy Society
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• v.5 no.1
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• pp.27-31
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• 2001

Purpose : The purpose of this study was to evaluate results of the arthroscopic treatment of calcific tendinitis of the shoulder resistant to conservative treatment. Materials and Methods : From March, 1996 to June, 1998, fourteen patients underwent shoulder arthroscopy to treat resistant calcific tendinitis of the rotator cuff despite conservative treatment for more than 6 months. Calcium deposits were localized to the supraspinatus tendon only in eleven patients, the supraspinatus and infraspinatus tendon in two patients, and to the supraspinatus and subscapularis tendon in one patient. Each shoulder was evaluated with UCLA shoulder rating scale and Constant-Murley score Results : The Constant-Murley pain score improved from average score 3.2 before surgery to average score 8.3 after surgery, and the UCLA functional average score improved from 4.5 preoperatively to 8.3 postoperatively. Preoperative ROM averaged $110^{\circ}$ of flexion, $45^{\circ}$ of external rotation, $90^{\circ}$ of abduction, and internal rotation with the thumb reaching to the spinous process of the third lumbar vertebra, but postoperative range of motion averages improved as follows: $170^{\circ}$ or flexion, $50^{\circ}$ of external rotation, $140^{\circ}$ abduction, and internal rotation with the spinous process of the twelveth thoracic vertebra. Overall 3 patients were rated excellentm 9 were good, 2 were fair. Conclusion : Shoulder arthroscopy is an effective treatment in patients with refractory calcific tendinitis.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05a
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• pp.607-610
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• 2003

지문 정합을 할 때 특징점 사이의 거리와 각도가 유사한 순서대로 있는가를 비교하는 알고리즘을 제안한다. 한 점에서 가장 가까운 특징점을 찾고 다시 찾은 점에서 가장 가까운 특징점을 찾는데 이러한 세 개의 특징점들 사이의 거리와 끼인 각도를 기본 요소로 하여 이들의 순차를 특징점 배치도로 정의하여 등록지문에도 유사한 순차가 있는지를 검사한다. 정합 시에 특징점 사이의 거리, 각도 순차가 있는가를 검사하기 때문에 중심점을 찾지 않아도 되며 지문의 이동, 회전에 영향을 받지 않는다.

• Journal of KIISE
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• v.44 no.7
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• pp.692-702
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• 2017

Face detection using the LBP based feature descriptor has issues in that it can not represent spatial information between facial shape and facial components such as eyes, nose and mouth. To address these issues, in previous research, a facial image was divided into a number of square sub-regions. However, since the sub-regions are divided into different numbers and sizes, the division criteria of the sub-region suitable for the database used in the experiment is ambiguous, the dimension of the LBP histogram increases in proportion to the number of sub-regions and as the number of sub-regions increases, the sensitivity to facial orientation rotation increases significantly. In this paper, we present a novel facial region segmentation method that can solve in-plane rotation issues associated with LBP based feature descriptors and the number of dimensions of feature descriptors. As a result, the proposed method showed detection accuracy of 99.0278% from a single facial image rotated in orientation.

• Journal of the Korean Society for Railway
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• v.16 no.3
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• pp.217-225
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• 2013

In this study, by considering the rail fastening support distance and the distance between the bridge and the abutment, the behavior of concrete track installed on a railway bridge end deck and the bridge end rotation were analyzed. In order to analyze the track-bridge interaction, bridge and abutment specimens with concrete track structures were designed and used in laboratory testing. At a constant fastening support distance, an increase in the bridge end rotation caused an increase in the displacement of the rail. Therefore, the displacement of the rail directly affects the rail and clip stress. Further, it is inferred that the results of multiple regression analysis obtained using measured data such as angle of bridge end rotation and fastening support distance can be used to predict the track-bridge interaction forces acting on concrete track installed on railway bridge deck ends.

• Journal of Advanced Navigation Technology
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• v.27 no.3
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• pp.255-261
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• 2023

A main purpose of this research was to analyze environmental factors to influence helicopter accidents contrary to the fact that the almost 80% of helicopter accidents happened due to pilots' human errors. There have been about 14 helicopter accidents in civil aviation sector last decade. It is noteworthy that nine of 14 accidents happened during the external sling load operation. Moreover, there is no law or regulation which could cover the helicopter external sling load operation or human external cargo in Korea. In this paper, it was analyzed the training and education regulations regarding helicopter external sling load operation or human external cargo in regulations of FAA and EASA, Based on analyzing and comparing the FAR part 133 and domestic aviation law (aviation safety act and flight safety regulations), it was found out the implication how to apply helicopter type rating for external sling load operation and human external cargo operation. To sum up, this paper expect central government should cooperate and amend aviation law which apply external sling load operation and external cargo to establish sound safety culture in Korea.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.4
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• pp.307-314
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• 2008

Loading noise generated by steady aerodynamic force exerted on the rotating body surface is theoretically analyzed and its radiation characteristics is examined as a fundamental research of helicopter rotor noise. For simplicity, the force exerted on each blade is not distributed but concentrated at one point and the noise is evaluated by using Lowson' exact formula with a discussion of the physical meaning of each term in the formula. For a single point force rotating with various angular frequencies, we investigated the radiation characteristics and theoretically explained the physical behavior at near and far-field. By investigating the amplitude of acoustic pressure with various distances, we observed the different decreasing ratio at near- and far-field with the discussion of the effect of acceleration of angular frequency. Finally, the phenomenon that the noise level is reduced everywhere as the number of blade increases is explained with the suggestion of a noise reduction idea, the limitations of this study, and the future research topics.

• Journal of the Korean Institute of Intelligent Systems
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• v.20 no.6
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• pp.748-754
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• 2010

To reduce the computational cost required for assembling vessel fragments using surface geometry, this paper proposes a fast axis estimation method. Using circular constraint of pottery and local planar patch assumption, it finds the axis of the symmetry. First, the circular constraint on each cylinder is used. A circular symmetric pot can be thought of unions of many cylinders with different radii. It selects one arbitrary point on the pot fragment surface and searches a path where a circumference exists on that point. The variance of curvature will be calculated along the path and the path with the minimum variance will be selected. The symmetric axis will pass through the center of that circle. Second, the planar patch assumption and profile curve is used. The surface of fragment is divided into small patches and each patch is assumed as plane. The surface normal of each patch will intersects the axis in 3D space since each planar patch faces the center of the pot. A histogram method and minimization of the profile curve error are utilized to find the probability distribution of the axis location. Experimental results demonstrate the improvement in speed and robustness of the algorithms.

• The Transactions of the Korean Institute of Power Electronics
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• v.9 no.5
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• pp.491-497
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• 2004

This paper presents a new rotor position estimation method for brushless DC motors. It is clear that the estimation error of the rotor position provokes the phase shift angle misaligned between the phase current and the back-EMF waveforms, which causes torque ripple in brushless DC motor drives. Such an estimation error can be reduced with the help of the proposed neutral voltage-based estimation method that is structured in the form of a closed loop observer. A neutral voltage appearing during the normal mode of the inverter operation is found to be an observable and controllable measure, which can be dealt with for estimating an exact rotor position. This neutral voltage is obtained from the DC-link current, the switching logic, and the motor speed values. The proposed algorithm, which can be implemented easily by using a single DC-link current and the motor terminal voltage sensors, is verified by simulation and experiment results.