오정석 교수

The LAFF is hairless, thin (especially with lateral epicondyle approach), and potentially sensate. They are advantageous features for tongue tip and hemi-tongue reconstruction. Donor site sacrifices the inessential posterior radial collateral artery, and the scar is hidden under short sleeve shirts. We believe that LAFF can be considered as the first choice flap for hemitongue reconstruction, over radial forearm free flaps.

This paper described the general concept of combustion instability and its mechanism in gas turbine engines. The approaching method to study this phenomenon was introduced including the up-to-date research activity in the world. Combustion instability is one of critical problems, still now, affecting engine performance, durability and operation. In addition it is known that this problem is caused by coupling between fuel or air flow fluctuation and heat release rate in gas turbine engines, which

In a two-phase operation, E. coli containing λSNU1 (Q-S-) in the chromosome is typically cultured at 33℃ and cloned gene expression is induced by elevating the temperature. At least 40℃ is necessary for complete induction of cloned gene expression; however, temperatures above 40℃ have been shown to inhibit cloned gene expression. This suggests that a three-phase operation, which has an induction phase between the growth and production phases, may result in higher gene expression. In this study,

ALT flap combined with its fascial component is useful for abdominal wall. It can be a reliable option in cases of intestinal exposure.

Malignant peripheral nerve sheath tumor (MPNST) is a very rare type of sarcoma, with an incidence of 0.001%. MPNST has a 5-year survival rate near 80%, so successful reconstruction techniques are important to ensure the patient's quality of life. Sarcoma of the forearm is known for its poor prognosis, which leads to wider excision, making reconstruction even more challenging due to the unique anatomical structure and delicate function of the forearm. A 44-year-old male presented with a large mas

DLN-2.6 combustion tuning was carried out for the maintenance of GE 7FA+e gas turbine at Seo-Incheon combined cycle power plant. DLN-2.6 combustion system has the higher level of yellow plume and combustion vibration problem in the initial operating mode than that of the base mode(100~160 MW). The objectives of this study are to investigate the causes of yellow plume and combustion vibration problems at the starting mode and to suggest the best operating condition for the reliable working of the

Combustion vibration and yellow plume are frequently occurred during an initial operating mode in GE 7FA+e DLN-2.6 combustors which are running at Seo-Inchon combined cycle power plant. The objectives of this paper are to analyze the causes of those two phenomena and to study non-dimensional factors to design a lab scale dump combustor. With the consideration of real combustor, the peak frequencies of vibration is 120~140 Hz due to cold flow in plenum. This plenum is considered as a major parame

With the advancement of free-flap techniques, the classic flaps have become less popular. Our new design supplements the PMMC flap by providing a thin pliable flap with a long pedicle and rotation arc, allowing a combination of different types of flaps to cover composite head and neck defects, especially in cases that lack a reliable recipient vessel due to radiation.

Reconstruction of large shoulder defects is challenging, especially in complicated chronic wounds. We report a case of a tuberculosis-infected shoulder defect in a patient with rheumatoid arthritis (RA) that was successfully reconstructed with pedicled latissimus dorsi (LD) musculocutaneous flap coverage. A 57-year-old male visited our department with a severely painful open wound (0.5 cm 0.5 cm), later confirmed to be tuberculosis (TB) infected, in the right anterior shoulder region. Several su

Extensive perineo-coccygeal defects can result from oncological resection of gynecological, urological, and colorectal tumors. The advancement of techniques in ablative surgeries has led to more-radical resections that leave larger defects 1 . At the same time, consideration for careful preservation of crucial structures that contribute various functions such as urination, defecation, sexuality, and reproduction cannot be neglected 2 . Defects that are irradiated for oncological management are e

It was experimentally studied that the stabilization mechanism of turbulent, lifted jet flames in a non-premixed condition to reveal the newly found liftoff height behavior of hydrogen jet. The objectives are to report the phenomenon of a liftoff height decreasing as increasing fuel velocity, to analyse the flame structure and behavior of the lifted jet, and to explain the mechanisms of flame stability in hydrogen turbulent non-premixed jet flames. The hydrogen jet velocity was changed from 100

The study of nitrogen dilution effect on the flame stability was experimentally investigated in a non-premixed turbulent lifted hydrogen jet with coaxial air. Hydrogen gas was used as a fuel and coaxial air was used to make flame liftoff. Each of hydrogen and air were injected through axisymetric inner and outer nozzles (dF=3.65 mm and dA=14.1 mm). And both fuel jet and coaxial air velocity were fixed as uF=200 m/s and uA=16 m/s, while the mole fraction of nitrogen diluents gas was varied from 0

Finger reconstruction involves paramount significance of both functional and aesthetic aspects, due to its great impact on quality of life. The options range from primary closure, skin grafts, local flaps, pedicled flaps, and free flaps. The optimal method should consider various circumstances of the patient and surgeon. We would like to report a case of a young woman who initially presented with cellulitis and necrosis of the left second finger-tip who underwent reconstruction with bilateral to

Background Various types of external breast tissue expanders have been found to be effective for aesthetic breast augmentation. However, their use has been limited when compared with implant-based breast augmentation due to the burdensome nature of their application. This article reports the possibility that external breast tissue expanders may be applied safely and effectively with higher pressure and shorter application time.Methods The participants comprised patients who desired breast augmen