전치부 개방 교합 환자의 두부 방사선학적 연구

이형신,진태호 원광대학교 치의학연구소 1993 圓光齒醫學 Vol.3 No.1

It was the purpose of this study to evaluate the differences of anterior open bite patients according to Hellman' s dental age and to compare skeletal open bite patients with dental open bite patients and to compare them with Korean normal occlusions and other racial groups with anterior open bite. Lateral cephalometric radiographs of 62 patients with anterior open bite and 31 persons with normal occlusion were traced and statistically analyzed. The results were obtained as follows 1. The factors which comprised the characteristics of the open bite were obtained, the openbite was due to combination of various factors than due to single factor. 2. According to Hellman' s dental age, the interincisal angle and UFH/TFH were decreased, but each cases of 1-NA , 1-NA(㎜), 1-NB(㎜) were increased. 3. Multiple regression analysis showed that the incisal overbite was much influenced by lower facial height, U.I.E to Pal. plane and L.I.E to Mn. plane, IMPA.

공침법을 이용한 마그네슘이 첨가된 biphasic calcium phosphate의 적합성 평가

이형신,김태완,김동현,박홍채,윤석영,Lee, Hyoung-Sin,Kim, Tae-Wan,Kim, Dong-Hyun,Park, Hong-Chae,Yoon, Seog-Young 한국결정성장학회 2010 韓國結晶成長學會誌 Vol.20 No.5

Mg-BCP(Mg Substituted BCP)를 제조하기 위하여 $Ca(NO_3)_2{\cdot}4H_2O$(Katayama chemical, Japan)과 $(NH_4)_2{\cdot}HPO_4$ (Junsei chemical, Japan), $Mg(NO_3)_2{\cdot}6H_2O$(Junsei chemical, Japan)를 출발물질로 공침법(co-precipitation process)을 이용하여 합성하였다. 제조된 분말의 마그네슘의 첨가에 따른 분말의 분광학적 특성은 FT-IR(MAGNA-IR 560, Nicolet)을 통하여 분석하였으며, SEM(S-4200, Hitachi)을 통하여 미세구조를 분석하였다. XRD 회절피크의 면적적분강도를 Integral Analysis (Rigaku, Japan)를 이용하여 HAp와 ${\beta}$-TCP의 비율을 확인하였다. 1.0 wt% 마그네슘이 첨가된 BCP 샘플의 경우 Hank's solution에서의 2주 침적 후 표면에 침상의 HAp로 추정되는 결정이 성장하였다. 이러한 미세구조의 변화는 생활성을 가지는 마그네슘의 첨가가 BCP 조직 내에서 표면의 활성을 증가시켜 결정의 성장을 촉진시킨 것으로 판단된다. Magnesium-substituted BCP (biphasic calcium phosphate) powders were prepared by incorporating small amounts of magnesium into the structure of different hydroxyapatite (HAp)/${\beta}$-tricalcium phosphate (${\beta}$-TCP) ratios through coprecipitation method. A series of magnesium substitutions ranging from 0, 0.5, and 1.0 wt%, which are comparable to the measured magnesium contents, were performed. The obtained powders were characterized by the following analytical techniques: X-ray diffraction analysis (XRD), Thermo Gravimetric Analyzer (TGA) and Fourier transform infrared spectroscopy (FT-IR). The results have shown that substitution of magnesium in the calcium-deficient apatites resulted in the formation of biphasic mixtures of different HAP/${\beta}$-TCP ratios after heating above $1000^{\circ}C$. The 1.0 wt% magnesiumsubstituted-BCP were soaked in Hank's solutions after 2 weeks to observe the morphology of the biocement, especially needle-like hydroxyapatite crystals and to estimate the length and diameter of nanoneedle crystals.

피부 전극을 활용한 반회후두신경의 수술 중 신경모니터링

이형신 대한이비인후과학회 2021 대한이비인후과학회지 두경부외과학 Vol.64 No.1

Efficiency of intraoperative neuromonitoring (IONM) for recurrent laryngeal nerve (RLN)during thyroid or parathyroid surgery has been well established. Electromyogram (EMG) tubehas been utilized as a standard method of IONM for RLN. However, limitations of EMG tubeincluding false positive signals due to malposition of the tube and relatively high cost havebeen issued. Recently, there have been several alternative methods using variable types ofskin electrodes to overcome the limitations of conventional EMG tube. These recent methodsusing skin electrodes will be reviewed in this article

텍스트 마이닝을 활용한 함정 시운전 종목명 분석

이형신,조현철 한국품질경영학회 2022 한국품질경영학회 학술대회 Vol.2022 No.2

본 연구에서는 효율적인 함정 시운전을 위하여 텍스트 마이닝의 대표적 기법중 하나인 워드 클라우드를 활용하여 한미 해군의 시운전 목적과 주안점을 다각적으로 파악하여 다음과 같은 결과를 도출하였다. 첫째, 한미 해군 시운전 종목을 키워드 클렌징을 통해 추출된 단어를 비교한 결과 한국 해군은 시운전을 단일 장비에 대한 시험의 개념으로 수행하며, 미 해군은 시스템에 초점을 둔 통합 시운전을 진행한다는 것을 알 수 있었다. 둘째, 한미 해군 시운전 연관도 분석 결과 약 66.6%가 유사한 항목으로 분석되었으며, 그중 2종목 이상 중복된 종목이 112종목이었다. 한국 해군 시운전 종목 252종목 대비 44%가 중복된 종목으로 미 해군 시운전 종목으로 통합시 89종목(전체 35%)이 축소 가능하다고 분석되었다. 함정은 여러 장비가 동시 다발적으로 작동하는 복합 시스템이다. 현재 한국 해군 시운전과 같이 개별 장비의 기능, 성능 확인에 중점을 두고 수행하는 것은 시운전 대상이 지나치게 많아져 시운전 기간이 증가하게 된다. 또한, 그로 인한 일정 및 평가비용 증가로 필요한 예산이 필연적으로 증가한다. 향후 미 해군의 시운전과 같이 통합 시스템적인 평가를 통한 효율적이면서 정확한 시운전을 위하여 추가적인 연구가 필요하다고 판단된다.

Transoral CO2 Laser Resection for Post-Radiation Arytenoid Edema

이형신,김성원,김우성,이강대 대한이비인후과학회 2010 Clinical and Experimental Otorhinolaryngology Vol.3 No.4

Arytenoid edema following radiation therapy of laryngeal cancer may persist and make careful inspection and evaluation of the larynx difficult. Moreover, it may have serious impacts on functions such as breathing, swallowing, speech and voice. Conservative management such as antibiotics and steroid may be attempted but may be ineffective in progressive and severe cases of edema. We present four cases of persistent postradiation arytenoid edema successfully treated with partial resection of the arytenoid mucosa using transoral CO2 laser.

물분사 추진기 임펠러 부식에 대한 원인분석

이형신,정운화 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.6

Cause analysis of surface pitting crack on a waterjet impeller was conducted. The waterjet impeller was made from stainless steel duplex 2205, which is more resistant to corrosion and local corrosion than typical stainless steel 316L and 317L, and has high mechanical strength, making it a useful material in various marine structures and seawater desalination facilities. The measurements were taken by scanning electron microscopy (SEM) and molecular ecological detection. The chemical composition of S was examined by SEM in the area of pitting corrosion. The dsrAB gene was detected on the sample of the pitting corrosion of the impeller through molecular ecological detection. Therefore, pitting corrosion on the surface of a waterjet impeller was caused by sulphite-reducing bacteria (SRB). To prevent the spread of SRB, management is required through high temperature treatments (over 65℃), pH management, or the insulation of a hull and waterjet. 이 연구는 함정 건조 중 국외도입된 물분사 추진기 임펠러 전체에 표면 점식이 확인되어 이에 대한 원인규명을 위하여 수행하였다. 물분사 추진기 임펠러의 재질은 듀플렉스 2205로 일반적인 스테인리스강인 316l 및 317L보다 부식 및 공식에 대한 저항성이 우수하며 높은 기계적 강도를 가지고 있어 각종 해양 구조물 및 해수 담수화 설비에 사용되는 재질이다. 물분사 추진기 임펠러에 표면 점식에 대한 원인분석을 위해 주사전자현미경 관찰 및 분자생태학적 분석 결과를 통해 다음과 같은 결론을 얻었다. 첫 번째로 주사전자현미경을 통하여 표면 점식이 일어난 부위에서 "S" 성분을 발견할 수 있었고, 두 번째로 분자생태학적 연구결과 부식된 물분사 추진기 임펠러에서 채취한 샘플에 "dsrAB" 유전자가 검출되어, 임펠러 부식은 황산염 환원균에 의한 것으로 판단할 수 있었다. 향후 황산염 환원균에 의한 제품의 손상을 방지하기 위해선 함정 운항 전, 후에 황산염 환원균이 활동하기 어려운 환경인 65℃ 이상의 고온처리 실시, pH5이하 또는 pH9이상 유지, 선체와 추진기의 절연을 통한 과잉전자 생성 방지 등 예방적 관리가 필요하다.

Patterns of Post-thyroidectomy Hemorrhage

이형신,김성원,최영식,박요한,이강대,이봉주,차용우 대한이비인후과학회 2009 Clinical and Experimental Otorhinolaryngology Vol.2 No.2

Objectives. Postoperative hemorrhage is a potentially life-threatening complication in thyroid surgery. This study was performed to review the clinical patterns of post-thyroidectomy hemorrhage, and especially as they are related to the source of bleeding. Methods. We performed a retrospective review of 10 patients (0.96%) with post-thyroidectomy hemorrhage that required surgical evacuation. The clinical patterns such as the time interval from surgery to hemorrhage and the signs and symptoms according to the bleeding focus were evaluated. Results. The mean time interval from surgery to symptom onset was 7 hr 52 min. Six cases showed bleeding deep to the strap muscles, while the other 4 cases showed bleeding superficial to the muscles. Ecchymosis was prominent and dark in color in 3 of the 4 cases (75%) of superficial bleeding, however it was identified in only 2 of the 6 cases (33%) of deep bleeding. Respiratory distress occurred in two cases of hematoma deep to the strap muscles, but in none of the cases with superficial bleeding. Conclusion. The post-thyroidectomy hemorrhage had some different clinical patterns between the superficial cases and the deep cases, showing that life-threatening airway obstruction occurred from the deep hematoma. A thorough understanding of the clinical patterns of post-thyroidectomy hemorrhage between the cases of superficial and those cases of deep hematoma may provide valuable surgical tips to manage this potentially lethal complication. Objectives. Postoperative hemorrhage is a potentially life-threatening complication in thyroid surgery. This study was performed to review the clinical patterns of post-thyroidectomy hemorrhage, and especially as they are related to the source of bleeding. Methods. We performed a retrospective review of 10 patients (0.96%) with post-thyroidectomy hemorrhage that required surgical evacuation. The clinical patterns such as the time interval from surgery to hemorrhage and the signs and symptoms according to the bleeding focus were evaluated. Results. The mean time interval from surgery to symptom onset was 7 hr 52 min. Six cases showed bleeding deep to the strap muscles, while the other 4 cases showed bleeding superficial to the muscles. Ecchymosis was prominent and dark in color in 3 of the 4 cases (75%) of superficial bleeding, however it was identified in only 2 of the 6 cases (33%) of deep bleeding. Respiratory distress occurred in two cases of hematoma deep to the strap muscles, but in none of the cases with superficial bleeding. Conclusion. The post-thyroidectomy hemorrhage had some different clinical patterns between the superficial cases and the deep cases, showing that life-threatening airway obstruction occurred from the deep hematoma. A thorough understanding of the clinical patterns of post-thyroidectomy hemorrhage between the cases of superficial and those cases of deep hematoma may provide valuable surgical tips to manage this potentially lethal complication.

Efficacy of Intraoperative Neuromonitoring During Thyroidectomy with Transcutaneous Adhesive Skin Electrodes

이형신 대한신경모니터링학회 2020 KINMoS 학술대회 발표자료 Vol.2020 No.11

양성침샘질환 수술에서 Thunderbeat^TM와 Harmonic scalpel^®의 유용성에 대한 비교연구

이형신,김성원,이강대,오다솔,김주현,고윤우,최은창,Lee, Hyoung Shin,Kim, Sung Won,Lee, Kang Dae,Oh, Dasol,Kim, Ju Hyun,Koh, Yoon Woo,Choi, Eun Chang 대한두경부종양학회 2018 대한두경부 종양학회지 Vol.34 No.1

Background and Objectives: Thunderbeat (TB) and Harmonic scalpel (HS) have been applied to variable head and neck surgery, which are useful for both coagulation and cutting of tissues. However, there have been no comparative studies covering the usefulness of these energy devices in surgery for major salivary gland. In this study, we analyzed the surgical outcomes of two devices in surgery for parotidectomy and submandibular gland (SMG) resection. Materials and Methods: A retrospective chart review of 90 patients including two groups (HS group, n=45 versus TB group, n=45) of patients matched for their patient factors was conducted. Clinicopathologic factors of the patients and surgical outcomes such as the operation time, intraoperative bleeding, amount and duration of drain, hospital stay and complications were compared between two groups. Results: There were no significant difference between two groups regarding the clinicopathologic factors and short-term surgical outcomes. Conclusion: Thunderbeat and HS are both effective and safe for parotidectomy and SMG resection in variable benign disease of major salivary gland.

Is there enough evidence to recommend preoperative calcium and vitamin D in patients who undergo total thyroidectomy?

이형신 고신대학교(의대) 고신대학교 의과대학 학술지 2022 고신대학교 의과대학 학술지 Vol.37 No.3