• 항공우주시스템공학회지
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• 제17권2호
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• pp.45-55
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• 2023

본 연구에서는 V-22 Osprey 틸트로터의 25% 축소 모델인 TRAM에 대하여 회전익기 통합 해석 코드인 CAMRAD II를 이용하여 프롭로터의 Aeromechanics 모델링과 블레이드 및 피치 링크에 대한 구조 하중 해석을 수행한 후, DNW 풍동 시험 및 선행 해석 연구 결과와 상호 비교하였다. 본 연구에서는 저속 전진 비행 시 블레이드 플랩 굽힘 모멘트의 구조 하중 및 진동 하중 변화를 풍동 시험 결과에 대하여 비교적 잘 예측하였다. 리드-래그 굽힘 및 비틀림 모멘트의 구조 하중 및 진동 하중 해석은 풍동 시험과 다소 다르게 얻어졌으나, 평균값을 제거하였을 때 로터 회전 한 바퀴당 구조 하중 해석 결과가 풍동 시험 및 선행 해석 연구와 비교적 유사하였다. 피치 링크의 구조 하중 및 진동 하중 해석은 전반적으로 선행 연구의 시험 및 해석 결과와 유사하게 얻어졌다. 마지막으로 블레이드 구조 진동 하중의 조화 성분 해석 및 비교를 통하여 블레이드 리드-래그 굽힘 및 비틀림 모멘트의 오차 발생 원인을 분석하였다.

• Archives of Plastic Surgery
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• 제35권6호
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• pp.663-668
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• 2008

Purpose: Pedicled transverse rectus abdominis myocutaneous(TRAM) flap has been a gold standard for breast reconstruction and one of surgical techniques preferred by many surgeons. The authors examined the course of deep epigastric artery focusing on distance from margins of rectus abdominis to pedicle and location of choke vessels to get minimal muscles during pedicled TRAM flap operation. Methods: Eleven rectus abdominis muscle from nine cadavers were used in this study. Rectus abdominis was separated from the cadavers, deep inferior and superior epigastric artery were isolated and then 8 anatomical landmarks in medial and lateral margins of rectus abdominis were designated. Distance to a pedicle meeting first horizontally was measured and vertical location from umbilicus to choke vessel was determined. In addition, 32 rectus abdominis images of 16 women(average age: 37.2 years old) from 64 channel abdomen dynamic computerized tomography were also examined with the same anatomical landmarks with those of cadavers. Results: Average distance from four landmarks on lateral margin of rectus abdominis to pedicle was 1.9 - 3.4cm and 1.8 - 3.8 cm on medial margin. Choke vessel was located between middle and inferior tendinous intersection in all cases and average distance between two tendinous intersection was 6.7 - 7.0 cm on medial margin and 6.2 cm on lateral margin. Location of inferior tendinous intersection was on umbilicus or superior of it in all cases and its average distance from umbilicus was 1.8 - 5.6 cm on medial margin and 2.7 - 6.2 cm on lateral margin. Conclusion: Distance from medial and lateral margins of rectus abdominis muscle to pedicle was the shortest in inferior tendinous intersection and that was averagely 1.8 cm on medial margin and 1.9 cm in average on lateral margin. All choke vessels were located between middle and inferior tendinous intersection.

• Archives of Plastic Surgery
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• 제35권1호
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• pp.28-35
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• 2008

Purpose: The pedicle of transverse rectus abdominis myocutaneous(TRAM) flap and deep inferior epigastric arterial perforator flap is deep inferior epigastic artery (DIEA) and accurate anatomic knowledge about perforator of DIEA is very important for the elevation of these flap. The authors investigated a detailed vascular network of perforator of DIEA in Koreans. Methods: 24 fresh cadavers were studied. Among them, 15 were examined based on the plain X-ray examination for the distribution and location of perforator of DIEA. And 9 fresh cadavers were examined based on the 3-dimensional computed tomography(CT) study for the distance between ending point of perforator of DIEA and mother artery, the distance between most medial mother artery and midline, the distance between most lateral mother artery and midline, and the running type of perforators of DIEA. Results: Based on the plain X-ray examination, suitable(external diameter$${\geq_-}0.5mm$$) perforators of DIEA are located between the level of umbilicus and 8 cm below it. Based on the 3D-CT study, average distance between the ending point of perforator of DIEA and the mother artery is 30.26 mm on the left, 28.62 mm on the right, respectively. The average distance between most medial mother artery and midline is 17.13 mm on the left, 15.76 mm on the right, respectively. The average distance between most lateral mother artery and midline is 56.31 mm on the left, 50.90 mm on the right, respectively. The main running course of suitable perforators of DIEA is type a, which is a direct musculocutaneous perforator vessel from main vascular axis passing outward to join the subdermal plexus, directly. Conclusion: 3-dimensional computed tomography study as well as plain X-ray examination provided more accurate and detail informations about perforators of DIEA in Koreans. These informations will help us understand the detailed vascular anatomy and operation with ease and safe in the lower abdomen of Koreans.

• Archives of Plastic Surgery
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• 제34권5호
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• pp.617-621
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• 2007

Purpose: With the necessity of comprehensive care for the breast cancer patients, Breast Care Center of our hospital started to work in March 2004. This study examined the 3-year execution of Breast Care Center. The role of Breast Care Center was evaluated in aspect of clinical activities in quality and quantity. Methods: A retrospective review was carried out from 2001 to 2007 with breast cancer patients. The number and type of breast cancer surgery and breast reconstruction procedure were compared before and after Breast Care Center's foundation. Time required for the diagnosis and treatment was also compared. Regression analysis and T-test were used to identify the statistical significance. Results: The number of breast cancer surgery did not statistically increase compared with progressive increase of breast cancer. QUART(quadrantectomy, axillary dissection, radiotherapy) procedure statistically significantly increased and MRM(Modified Radical Mastectomy) procedure decreased for breast cancer surgery after foundation of Breast Care Center. The number of breast reconstruction procedures statistically significantly increased. The number of immediate TRAM free flap (Transverse Rectus Abdominal muscle free flap) procedures has grown 3.8 times after foundation of Breast Care Center. The time required for diagnosis and treatment was also shortened. Conclusion: After foundation of Breast Care Center, the number of breast reconstruction surgery increased, while the counselling time in breast reconstruction was reduced. Breast Care Center provided a prompt and comprehensive care to the breast cancer patients through the multidisciplinary therapeutic approaches.

• 한국철도학회논문집
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• 제10권6호
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• pp.786-791
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• 2007

고속열차의 속도가 300km/h 이상이 되면 난류의 박리나 와류발산 등에 의한 공력소음의 영향이 지배적이 된다. 본 연구에서는 KTX와 한국형고속열차의 외부에서 발생하는 공력소음, 특히 차간 공간에서 발생하는 소음의 특성을 시험을 통해 규명한다. 차량 실내외의 소음 측정을 통해 이 소음의 특성을 분석하였고, 풍동시험을 통해 머드플랩 사이의 틈의 크기가 저주파 소음 발생에 직접적인 영향을 준다는 것을 규명하였다. 또한 마이크로폰어에이 시험으로 고속열차의 외부에서 발생하는 소음의 주파수 특성을 분석하였다.

• Archives of Plastic Surgery
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• 제36권6호
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• pp.784-787
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• 2009

Purpose: Reduction mammaplasty is one of the most commonly performed operations in plastic surgery. Although secondary surgery is occasionally required for minor aesthetic problems or for treatment of the complications of the primary surgery, there are no clear operative guidelines of management. We report here two cases of secondary reduction mammaplasty using differrent pedicle from the initial ones. Methods: One case of secondary reduction mammaplasty were performed using medial pedicle after central (19 years) pedicle reduction mammaplasty because of subsequent breast ptosis and asymmetry. The other case were performed using medial pedicle after superior (4 years) pedicle reduction mammaplasty with contralateral immediate breast reconstruction with TRAM flap because of subsequent breast ptosis and asymmetry. Care was taken to include sufficient width of pedicle and adequate soft tissue attachment beneath the nipple - areolar complex. Results: There was no significant complication such as nipple - areolar necrosis or fat necrosis. The results were well maintained throughout the follow - up period. Conclusion: Medial pedicle reduction mammaplasty can be safely performed after central or superior pedicle reduction mammaplasty when sufficient width of pedicle and adequate soft tissue attachment beneath the nipple - areolar complex are maintained.