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송준호 서울시립대학교 산업기술연구소 1996 산업기술연구소논문집 Vol.4 No.-
We investigate paths of a walker under the condition that the walker is not allowed to visit any point more than once and to make any turn more than (n/2)π from any of the directions previously taken on the square lattice. Moreover, we study the properties of rotational restriction in 2-choice, 3-choice directed self-avoiding walks, and Φmax = π model. Using the graph theory method, difference equations are derived to count the total number of paths of the walker.
송준호,배중호,이고운,이일복,황기범,조우석,한상준,윤성훈 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
Titanium doping is employed to enhance the structural strength of a high-Ni layered cathode material in lithium ion batteries during high temperature cycling. After Ti-doping, the external morphology remains similar, but the lattice parameters of the layered structure are slightly shifted toward larger values. With application of the prepared materials as cathodes in lithium-ion batteries, the initial capacities are similar but the cycling performance at 25 °C is enhanced by Ti-doping. During high temperature cycling at 60 °C, furthermore, highly improved capacity retention is achieved with the Ti-doped material (95% of initial capacity at 50th cycles), while cycle fading is accelerated with the bare electrode. This enhancement is attributed to better retention of the compressive strength of the particles and retarded crack formation within the particles. In addition, impedance increase is reduced in the Ti-doped electrode, which is attributed to an improvement in the structural strength of the high-Ni cathode material with Ti-doping.
Salvage of Infected Breast Implants
송준호,김영석,정복기,이동원,송승용,노태석,유대현 대한성형외과학회 2017 Archives of Plastic Surgery Vol.44 No.6
Background Implant-based breast reconstruction is being performed more frequently, and implants are associated with an increased risk of infection. We reviewed the clinical features of cases of implant infection and investigated the risk factors for breast device salvage failure. Methods We retrospectively analyzed 771 patients who underwent implant-based breast reconstruction between January 2010 and December 2016. Age, body mass index, chemotherapy history, radiation exposure, and smoking history were assessed as potential risk factors for postoperative infection. We also evaluated the presence and onset of infection symptoms, wound culture pathogens, and other complications, including seroma, hematoma, and mastectomy skin necrosis. Additionally, we examined the mastectomy type, the use of acellular dermal matrix, the presence of an underlying disease such as hypertension or diabetes, and axillary node dissection. Results The total infection rate was 4.99% (58 of 1,163 cases) and the total salvage rate was 58.6% (34 of 58). The postoperative duration to closed suction drain removal was significantly different between the cellulitis and implant removal groups. Staphylococcus aureus infection was most frequently found, with methicillin resistance in 37.5% of the cases of explantation. Explantation after infection was performed more often in patients who had undergone 2-stage expander/implant reconstruction than in those who had undergone direct-to-implant reconstruction. Conclusions Preventing infection is essential in implant-based breast reconstruction. The high salvage rate argues against early implant removal. However, when infection is due to methicillin-resistant S. aureus and the patient’s clinical symptoms do not improve, surgeons should consider implant removal.