• Archives of Plastic Surgery
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• 제38권6호
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• pp.845-850
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• 2011

Purpose: In general, orientals including Korean, have a mesocephalic face whereas Caucasians, among the western, have a dolichocephalic face. Unlike the western, in orientals including Korean, prominent malar bones are recognized as stubborn and unattractive appearance. That is why reduction malarplasty is one of the most popular aesthetic surgical procedure in Korea. Many surgical methods to reposition prominent malar bones have been performed by means of a coronal incision or a combined incisions, using both the intraoral and the external incision. Bicoronal approach has advantage such as wide operative field, easy to maintain symmetry and possibility of combining facial lift but has shortcoming, such as external scars, long operative time, and the possibility of facial nerve or artery injury. Intraoral approach has advantages of short operative time, simplicity of procedure and no external scar. But this approach is associated with problems of cheek drooping, limited exposure and difficulty in making symmetry. Methods: During 8 years, we performed a reduction malarplasty without internal fixation through an minimal intraoral incision and dissection in 39 patients. Results: The patients were followed for 46 months, with satisfactory results and no cheek drooping. There was no patient who want to revise the inappropriate operative result such as asymmetry and incomplete correction. Conclusion: We conclude that minimal intraoral incision and dissection could acquire satisfactory result of reduction malarplasty along with prevention of cheek drooping.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제40권6호
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• pp.297-300
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• 2014

Objectives: To compare the clinical and radiological outcomes after closed reduction (CR) and open reduction and internal fixation (ORIF) in the management of subcondylar fractures. Materials and Methods: Forty-eight patients presenting with subcondylar fracture between January 2010 and March 2013 were evaluated retrospectively. Fifteen patients were treated with CR and 33 patients with ORIF. The clinical and radiologic parameters were evaluated during follow-up (mean, 7.06 months; range, 3 to 36 months). Results: In the CR group, no patients had any problems with regard to the clinical parameters. The average period of maxillomandibular fixation (MMF) was 5.47 days. The preoperative average tangential angulation of the fractured fragment was $3.67^{\circ}$, and loss of ramus height was 2.44 mm. In the ORIF group, no clinical problems were observed, and the average period of MMF was 6.33 days. The preoperative average tangential angulation of the subcondylar fragment was $8.66^{\circ}$, and loss of ramus height was 3.61 mm. Conclusion: CR provided satisfactory clinical results, though ORIF provided more accurate reduction of the fractured fragment. So there is no distinct displacement of fractured fragment, CR should be selected than ORIF because of no need for surgery.

• 한국방사선학회논문지
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• 제13권4호
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• pp.667-674
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• 2019

Technegas를 사용한 검사는 단순 확산 누적을 통해 폐 영상을 이미지화하기 때문에 검사를 마친 후에 검사실이 오염될 수 있다. 따라서 방사선 작업 종사자와 검사를 기다리는 환자는 technegas 흡입으로 인한 내부 피폭의 영향을 받게 된다. 이에 중력환기 전후의 시간경과에 따른 공간선량율 분포를 비교, 분석함에 따라 방사선사, 의료진, 대기 환자의 피폭선량 저감화 방법을 모색하고자 한다. 중력환기 전후 환자의 호흡기 위치에서 거리별, 각도별로 공간선량율을 10분 동안 측정하고 평균값, 표준 편차 및 감소율을 계산하였다. 실험 결과, 중력 환기 전후 감소율은 최고 95.31%였고 가장 높은 감소율은 1 ~ 3분 사이에서 나타났다. 중력환기를 통해서 방사선 작업종사자, 대기환자, 환자 보호자 및 간호사의 피폭선량을 감소시킬 수 있다. 결론적으로 중력환기를 통한 피폭선량 감소 결과는 방호 최적화를 이루는 역할을 할 것이며 ICRP 103에서 권고한 의료 피폭 저감화에 부합된다.

• 서비스연구
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• 제7권1호
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• pp.65-82
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• 2017

본 연구는 국내 서비스산업의 기업체를 대상으로 고몰입 인적자원관리의 수준이 서비스성과에 미치는 효과와 조직의 내적인 혁신방향이 갖는 매개효과를 분석하였다. 구체적으로 내적인 혁신 방향은 기업의 인력과 서비스의 고부가가치화 방향과 비용절감 다운사이징 방향으로 구성되며, 인력과 서비스의 고부가가치화 방향은 긍정적인 매개효과를 가질 것으로, 비용절감 다운사이징 방향은 부정적인 매개효과를 가질 것으로 예측하였다. 분석을 위한 자료는 한국노동연구원(KLI)의 2013년도 사업체패널 조사자료(WPS)의 1,775개 업체 중 도소매, 운수, 전문과학서비스, 교육서비스, 보건사회복지서비스, 금융서비스, 기타(정보사회지원서비스 등)서비스로 분류되는 896개 사업체의 응답을 활용하였다. 가설검증을 위한 분석은 구조방정식 분석을 사용하였다. 분석 결과, 고몰입 인적자원관리는 고부가가치화 혁신방향에 긍정적인 영향을 미치며, 비용절감 다운사이징에는 부정적인 영향을 미치는 것으로 나타났다. 또한 고부가가치화 혁신방향은 서비스성과에 긍정적인 영향을 미쳤으며, 비용절감 다운사이징은 서비스성과에 부정적인 영향을 미치는 것으로 나타났다. 그리고 고몰입 인적자원관리의 서비스성과에 대한 직접효과를 확인하지 못하였으나, 고부가가치화 혁신 방향의 긍정적인 매개효과와 비용절감 다운사이징 혁신 방향의 부정적인 매개효과가 유의한 것으로 나타나 두 변수가 고몰입 인적자원관리와 서비스성과의 관계에 대해 완전매개효과를 가지는 것을 확인하였다.

• Tuberculosis and Respiratory Diseases
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• 제75권2호
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• pp.79-82
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• 2013

Tracheal Stenosis after Tracheostomy Treated Successfully with Papillotome Electrocautery A 39-year-old woman presented with symptoms of dyspnea. Ten years previously, she had received a tracheostomy because of the decision to not continue taking an anticonvulsant drug. Presently, chest computed tomography showed diffuse stenosis and focal web at the cervical trachea. We performed bronchoscopy and found a two-thirds reduction of the upper trachea due to the web-like fibrotic stenosis. Papillotome electrocautery removed the stenotic lesion. Endobronchial electrocautery is a valuable tool with potential for therapy of an endobronchial obstructing airway lesion. We report this case to introduce the successful treatment with papillotome electrocautery.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제36권1호
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• pp.30-36
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• 2014

There are many treatment options in management of mandibular condylar neck fractures. Closed reduction is the most conservative treatment; however, achievement of anatomic reduction is difficult, and there are some risks of mandibular functional impairment. Open anatomic reduction and internal fixation have some advantages; therefore, many oral and maxillofacial surgeons have attempted to achieve anatomic reduction through the open approach and extracorporeal reduction and fixation. However, when using this method, there is some risk of resorption of the fractured mandibular condylar head. Therefore, we designed a modified extracorporeal reduction technique, without detaching the lateral pterygoid muscle in order to maintain the blood supply to the fractured mandibular condylar head. We believe that this minor modification may minimize the risk of resorption of the fractured mandibular condylar head. In this article, we introduce this technique in detail, and report on two cases.

• Korean Journal of Chemical Engineering
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• 제35권11호
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• pp.2321-2326
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• 2018

We evaluated the optimal conditions for fluidization of nickel oxide (NiO) and its reduction into high-purity Ni during hydrogen reduction in a laboratory-scale fluidized bed reactor. A comparative study was performed through structural shape analysis using scanning electron microscopy (SEM); variance in pressure drop, minimum fluidization velocity, terminal velocity, reduction rate, and mass loss were assessed at temperatures ranging from 400 to $600^{\circ}C$ and at 20, 40, and 60 min in reaction time. We estimated the sample weight with most active fluidization to be 200 g based on the bed diameter of the fluidized bed reactor and height of the stocked material. The optimal conditions for NiO hydrogen reduction were found to be height of sample H to the internal fluidized bed reactor diameter D was H/D=1, reaction temperature of $550^{\circ}C$, reaction time of 60 min, superficial gas velocity of 0.011 m/s, and pressure drop of 77 Pa during fluidization. We determined the best operating conditions for the NiO hydrogen reduction process based on these findings.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제16권3호
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• pp.273-280
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• 1994

The Magnetic Resonance Imaging has been used widely to evaluate the disk position without any interruption of the TMJ structures, and the Dynamic MRI presenting computed serial imaging or the video-recorded simulation images is thought to be very effective to evaluate the disk position under function. This is to study the correlation between the clinical diagnosis and the findings of Dynamic MRI for the diagnosis of internal derangement of the temporomandibular joints. 30 joints(15 patients) were examined clinically, and the movement of TMJ meniscus was reviewed in the dynamic MRI. The comparative results are as follows : 1. All internal derangements of TMJ disk displacement without reduction were consistent with MRI findings. 2. 5 joints (50%) of disk displacements with reduction could not be confirmed by MRI findings. 3. The disk displacements in MRI were found in 55% of painful joints, 50% of clicking joints, and 70% of the joints with restricted movement. 4. The reliability of MRI for the diagnosis of TMD was evaluated as 77% ; 24 of 30 joints who presented with clinical diagnosis of TMD. 5. MRI is very reliable to diagnose the disk displacement without reduction, but it is rather not so effective to diagnose the early derangement or muscle disorders.

• 대한치과의사협회지
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• 제54권12호
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• pp.1045-1054
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• 2016

Purpose : Aim of this study is to describe and compare clinical results and complications epending on the surgical approaches for the mandibular subcondyle fracture Materials and methods : The patients who had been diagnosed as the mandibular subcondyle fracture and underwent open reduction and internal fixation from May 2009 to December 2014 were included. They were divided into two groups depending on the surgical approaches; endoscopically assisted transoral approach and retromandibular approach. Association between the preoperative fracture classification and post-operative results was reviewed depending on the surgical approaches. Results : The number of patients selected in this study was 33. Eighteen patients (male 7, female 11) underwent open reduction and internal fixation via retromandibular approach and fifteen patients (male 12, female 3) underwent open reduction and internal fixation via endoscopically assisted transoral approach. The mean age, follow up period, and operation time were $44.29{\pm}15.19years$, $9.97{\pm}7.82months$, and $161{\pm}89.44minutes$. Post-operative results were all "good" state in the retromandibular approach group regardless of the fracture classification but two patients in the endoscopically assisted transoral approach group underwent re-operation due to "poor" results. The fracture types of two were classified as displacement and lateral override at the same time. There was no statistically significant difference between two groups. Three patients in the retromandibular approach group had experienced facial nerve palsy (17%) temporarily. No one showed malocclusion in this study. There was no significant difference on the complications such as temporomandibular disorder, local infection, and condyle resorption depending on the surgical approaches. Conclusion : In this study, there was no significant difference on the complications between the two groups but retromandibular approach has advantage over endoscopically assisted transoral approach in case of the severely displaced subcondyle fracture.

• 대한족부족관절학회지
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• 제13권1호
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• pp.75-79
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• 2009

Purpose: To evaluate the outcomes of intra-articular calcaneal fractures treated using AO calcaneal plate surgically. Materails and Methods: Total 15 cases of intra-articular calcaneal fracture that treated with open reduction and internal fixation using AO calcaneal plate were evaluated. The patients were followed over a mean period of 19.8 months. The mean age was 41.6 years. By Sanders classification, there were 2 cases of type II, 10 cases of type III, and 3 cases of type IV. We evaluated radiological outcomes by Bohler angle, Gissane angle, calcaneal hight, calcaneal width and clinical outcomes by Creighton-Nebraska health foundation score. Results: All fractures united at a mean duration of 13.3 weeks. Radiologically, the mean preoperative Bohler angle was $8.5^{\circ}$ and restored to $23.3^{\circ}$. The mean preoperative Gissane angle was $118.7^{\circ}$ and restored to $124.2^{\circ}$. The mean preoperative calcaneal hight was 30.8 mm and restored to 38.9 mm. The mean preoperative calcaneal width was 41.3 mm and restored to 35.3 mm. 10 cases had excellent and good clinical outcomes and 5 cases having fair outcome. Conculsion: In our study, open reduction and internal fixation using AO calcaneal plate showed good results with anatomical restoration of articular surface and stable fixation without late collapse.