다구역 격자 기법을 이용한 Missile 주의 유동장의 수치모사

심정환 空軍士官學校 1996 論文集 Vol.38 No.-

In the present stydy, the flowfield over conventional wing-body-tail missile configuration is simulated by multi-block grid method. In the multi-block method, the whole physical domain is decomposed into 2 subdomains. Each domains are solved independently and the flow property information is exchanged at the boundary surfaces through artificial dummy cells. Multi-zone scheme developed in the present study is compared with NASA's experimental data and validated. The results show general characteristics of wing-body-tail missile configuration flows, and the strategy presented here is efficent and gives reliable results for aerodynamic analysis of a tactical missile configuration.

일차 구개성형술 후 발생된 지속적인 술후출혈

심정환,김영균,채병국 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.5

A 11-month-old infancy was referred for treatment of cleft palate. The patient's congenital deformities had included oronasal fistula on the soft palate and bifid uvula. Furrow double-opposing Z-plasty was performed under general anesthesia. However, postoperative bleeding developed at ward. Despite the pressure of operative wound, venous oozing continued and hemoglobin concentration and RBC were decreased (Hb: 5.5g/dL, RBC :1.98×106/mm3). The patient was pale and confused and transferred to Surgical Intensive Care Unit(SICU) We could not keep the peripheral venous line and there was a high risk of hypovolemic shock. Emergency transfusion was performed through the central femoral venous line and emergency operation for bleeding control was carried out. We explored the operation site and found bleeding point from the posterior pharyngeal wall. Electrocoagulation and surgicel packing were carried out and bleeding was stopped.

외상성 관절원판 전위에 의한 청각장애: 증례보고 : 증례 보고 A CASE REPORT

심정환,김영균,안철민 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.2

Fifty nine year-old male patient was referred for the correction of external auditory canal impatency according to anterior bony wall fracture of canal during the otolaryngologic treatment for hearing disorder. At clinical examination there are both temporomandibular joint(TMJ) pain, tenderness and left TMJ noise. We could find that if mouth was opened, external auditory canal impateted, and if closed, patented through otoscopy. We planned exploratory TMJ open surgery under clinical diagnosis of traumatic TMJ meniscus displacement and external auditory canal bony wall fracture, of under clinical diagnosis. During arthroplasty we found that posterior displaced meniscus pressured the fractured external auditory canal so we prepositioned meniscus anteriorly. After arthroplasty, TMJ noise disappeared and hearing funtion recovered. We experienced hearing disorder due to TMJ meniscus posterior displacement, so we present a case report with literature review.

Closure of Myelomeningocele Defects Using a Limberg Flap or Direct Repair

심정환,황나현,윤을식,동은상,김덕우,김상대 대한성형외과학회 2016 Archives of Plastic Surgery Vol.43 No.1

Background The global prevalence of myelomeningocele has been reported to be 0.8–1 per 1,000 live births. Early closure of the defect is considered to be the standard of care. Various surgical methods have been reported, such as primary skin closure, local skin flaps, musculocutaneous flaps, and skin grafts. The aim of this study was to describe the clinical characteristics of myelomeningocele defects and present the surgical outcomes of recent cases of myelomeningocele at our institution. Methods Patients who underwent surgical closure of myelomeningocele at our institution from January 2004 to December 2013 were included in this study. A retrospective chart review of their medical records was performed, and comorbidities, defect size, location, surgical procedures, complications, and the final results were analyzed. Results A total of 14 patients underwent surgical closure for myelomeningocele defects. Twelve cases were closed with direct skin repair, while two cases required local skin flaps to cover the skin defects. Three cases of infection occurred, requiring incision and either drainage or removal of allogenic materials. One case of partial flap necrosis occurred, requiring secondary revision using a rotational flap and a full-thickness skin graft. Despite these complications, all wounds eventually healed completely. Conclusions Most myelomeningocele defects can be managed by direct skin repair alone. In cases of large defects, in which direct repair is not possible, local flaps may be used to cover the defect. Complications such as wound dehiscence and partial flap necrosis occurred in this study; however, all such complications were successfully managed with simple ancillary procedures.

측두하악관절 관혈적 수술에 관한 임상적 연구

심정환,김영균,윤필영 대한악안면성형재건외과학회 2005 Maxillofacial Plastic Reconstructive Surgery Vol.27 No.1

Most patients with temporomandibular disorder can be treated conservatively. However, open TMJ surgery can be needed in some patients. We analysed the patients with TMD which open surgery has performed since 1998. Open surgery was carried out in 8 patients. Age ranged from 22 to 61 years, with a mean of 42.8years. All patients were male. Final diagnosis was obtained based upon clinical, radiographic and operative finding as follows; habitual luxation, bony ankylosis, traumatic arthritis, disc displacement with destructive change, disc displacement and adhesion. Etiologic factors included trauma(4), infection(2), and unknown(2). Open surgery included arthroplasty with either of condylectomy, eminectomy, meniscoplasty, capsurrohaphy. All patients were recovered uneventfully without severe complications. Some mouth opening limitation and mouth opening deviation remained. Postoperative aggressive physical therapy and careful follow up were performed. In conclusion, open TMJ surgery must be considered in organic disease such as ankylosis, tumor and TMD without favorable recovery after long-term conservative therapy.

경비기관내튜브의 발관 지연에 따른 환자의 불편감 정도 분석 -A Pilot Study

심정환,이영은,김현정,염광원,박윤기,서광석,Shim, Jung-Hwan,Yi, Young-Eun,Kim, Hyun-Jeong,Yum, Kwang-Won,Park, Yun-Ki,Seo, Kwang-Suk 대한치과마취과학회 2007 Journal of Dental Anesthesia and Pain Medicine Vol.7 No.1

Background: It is well known that nasotracheal intubation is comfort for patient compared to oral intubation. We sometimes delay extubation when it is thought that the patient can not maintain airway, or there may be other emergency associated with airway. And we sometimes experience complaint of discomfort of nasotracheal tube. But, we could not find any report on degree of discomfort of delayed nasotracheal intubation. Methods: Eighteen patients in whom extubation of nasotraceal tube was delayed after operation because of difficulties of airway mamagement were selected. We surveyed the discomfort of nasotracheal tube with 0 to 10 visual analogue scale (VAS) and compared with the pain of operation site (VAS). Result: The VAS of nasotracheal intubation was $6.7{\pm}3.4$, and VAS of the primary operation site was $3.5{\pm}2.4$, and VAS of flap harvest site was $5.5{\pm}2.7$. 10 of the patients complained of nasotracheal suction extremely and 6 patients complained of respiratory difficulties. Conclusions: Nasotracheal intubation was discomfort and there must be intervention.

타이타늄 임프란트 주위 골유착 관여 유전자의 발현: BMP2, BMP4

심정환,지유진,송현철,Shim, Cheong-Hwan,Jee, Yu-Jin,Song, Hyun-Chul 대한악안면성형재건외과학회 2005 Maxillofacial Plastic Reconstructive Surgery Vol.27 No.4

After dental implant are planted into their bony site among the various growth factors associated with bone formation. BMP is expressed in the bone surrounding the implant fixture. By taking a close look at BMP2, BMP4 which are growth factors that take put in bone formation, its histologic features and radiographic bone healing patterns we would like to examine the mechanism of osseointegration. We randomly used 8 male and female house rabbit amd used diameter 5 mm height spiral shaped implants(Ostem, Korea) for animal use handled as a resorbable blast machined(RBM) surface and machined surface. 2group were formed and each group had RBM surface and machined surface implant or a simple bone cavity. After 3, 7, 14 and 28 days post surgery 2 objects were sacrificed from each group and histologic specimens were acquired. RT-PCR analysis was conducted and after H&E staining the extent of osseointegration was measured applying a histologic feature and histomorphometric analysis program. Quanitity one -4.41(Bio-Rad, USA) was used after scanning the PCR product image of the growth factors manifested in each group. According to the histomorphometric features the RBM, Machined surface group showed increased contact between bone and implant surface at 3, 7, 14 and 28 days after surgery. The BMP2 level increased in both experiment groups but remained unchanged in the contrast group. BMP4 levels stayed steady after the early post implantation period for RBM but showed decreased in the machined surface group and contrast group. The amount of contact between bone and implant surface increased with the passage of time. BMP2, BMP4 were expressed in both experimental group and contrast group. These growth factors play a role in osseointegration of implant.

측두하악관절 관혈적 수술에 관한 임상적 연구

심정환,김영균,윤필영,Shim, Cheong-Hwan,Kim, Young-Kyun,Yun, Pil-Young 대한악안면성형재건외과학회 2005 Maxillofacial Plastic Reconstructive Surgery Vol.27 No.1

Most patients with temporomandibular disorder can be treated conservatively. However, open TMJ surgery can be needed in some patients. We analysed the patients with TMD which open surgery has performed since 1998. Open surgery was carried out in 8 patients. Age ranged from 22 to 61 years, with a mean of 42.8years. All patients were male. Final diagnosis was obtained based upon clinical, radiographic and operative finding as follows; habitual luxation, bony ankylosis, traumatic arthritis, disc displacement with destructive change, disc displacement and adhesion. Etiologic factors included trauma(4), infection(2), and unknown(2). Open surgery included arthroplasty with either of condylectomy, eminectomy, meniscoplasty, capsurrohaphy. All patients were recovered uneventfully without severe complications. Some mouth opening limitation and mouth opening deviation remained. Postoperative aggressive physical therapy and careful follow up were performed. In conclusion, open TMJ surgery must be considered in organic disease such as ankylosis, tumor and TMD without favorable recovery after long-term conservative therapy.

하악 매복지치의 예방적 발거 후 구취의 평가

심정환(Cheong-Hwan Shim),김영균(Young-Kyun Kim),최용근(Yong-Geun Choi) 대한치과의사협회 2003 대한치과의사협회지 Vol.41 No.1

임프란트 수술후 발생한 상악동염의 치험례

심정환(Cheong-Hwan Shim),김영균(Young-Kyun Kim),윤필영(Pil-Young Yun) 대한치과의사협회 2005 대한치과의사협회지 Vol.43 No.12