NiTi Rotary Instrumentation이 근관만곡도 변화에 미치는 영향

임형태,홍찬의,조용범 大韓齒科保存學會 1998 Restorative Dentistry & Endodontics Vol.23 No.1

During cleaning and shaping of narrow and curved canals, it is very difficult or nearly impossible to maintain the original canal shape. Procedural accidents such as, ledge, zipping, perforation, and instrument breakage are frequently occurred and even may lead to failure of endodontic therapy. To prevent these kinds of accidents, various instrumentation techniques and materials have been introduced. Recently some nickel titanium (NiTi) files are introduced and it is reported that These NiTi files created rounder preparations with less transportation than conventional instruments in curved canals. This study compared the change of the canal curvature and procedural accidents after instrumentation produced by stainless steel K-flexo file, and NiTi rotary files (Profile 29 and Quantec 2000). Thirty narrow and curved canals (25-45 degree) of extracted human molars were randomly divided into three groups. In group 1, canals were instrumented using a step-back and watch-winding/pull motion with K-flexo files. In group 2, canals were prepared with Profile 29. Group 3, canals were prepared with Quantec 2000 files. Before and after preparation of canals, periapical radiographs were taken and scanned. The change of canal curvature were measured using Photoshop 4.0 program and the incidence of procedural accidents were also evaluated. The results were as follows : 1. All group showed some loss of canal curvature after instrumentation. 2. Average loss of canal curvature was 6.70±5.31 degree for group 1, 3.80±2.57 degree for group 2, and 5.40±4.83 degree for group 3. All group There was significant change in curvature between before and after instrumentation (p<0.05). But there was no statistical difference amoung 3 groups. 3. In group 1, there were no procedural accidents, such as ledging, perforation, or instrument fracture. In group 2, two cases of ledge and one case of instrument fracture were produced. Goup 3, each one case of ledge, perforation and instrument fracture were occurred. Whthin the limits of above results, It seems that NiTi rotary instrumentation is not All Mighty and if we use uncarefully, it is more dangerous to produce some procedural accidents than conventional hand files. But more studies should be taken to evaluate the exact effects of NiTi rotary instrumentations.

부비동내시경수술 후 후각기능의 변화

김진국,남태욱,임채형,장현종 건국대학교 의과학연구소 2002 건국의과학학술지 Vol.12 No.-

Background and Objectives: Rhinosinusitis is the most common cause of olfactory impairment and endoscopic sinus surgery is considered as a surgical procedure of choice for treating chronic sinusitis. CC-SIT (Cross-Cultural Smell Identification Test) consists of 12 items well known in most non-English-speaking cultures. Authors evaluated the therapeutic effects of endoscopic sinus surgery on olfactory dysfuction using CC-SIT. Materials and Methods: The subjects of this study were seventeen sinusitis patient who had undergone ESS from November 2001 through April 2002. All patients were divided into two groups according to nasal polyp and CT findings. CC-SIT was used for the evaluation of olfactory function. Results: Forty seven percents of patients had improvement in olfactory function postoperatively. No correlation was found between changes in CC-SIT score and nasal polyp and preoperative CT findings. Conclusion: It is concluded that nasal polyp and CT findings have no effect on olfaction.

한국인에서 CC-SIT와 비교한 KVSS Test의 임상적 유용성 평가 : 예비연구 Pilot study

김진국,장현종,임채형,남태욱,심대보 건국대학교 의과학연구소 2003 건국의과학학술지 Vol.13 No.-

Background and Objectives: Sniffin' Sticks test is the test of nasal chemosensory performance based on pen-like odor dispensing devices. KVSS(Korean Version of Sniffin' Sticks) Test was developed as the "Korean olfactory test" using the odorants which are familiar to Korean. Authors evaluated the clinical validity of KVSS Test compared with CC-SIT (Cross-Cultural Smell Identification Test) in Korean. Materials and Methods: The subjects of this study were 25 normosmic volunteers who were divided into five groups according to age. Each group was 5 normosmic volunteers. And they consisted of 12 men and 13 women. KVSS Test and CC-SIT were used for the evaluation of olfactory function. Results: Our study showed the negative correlation between age and olfactory function test (CC-SIT score, KVSS Test I score and KVSS Test II score). Normosmia rate of KVSS Test was more higher than that of CC-SIT. Also KVSS Test had more familiar items for Koreans compared with that of CC-SIT. CC-SIT score and KVSS Test score showed showed the positive corrclation. And each test revealed high reliability in test-retest evaluation. Conclusion: The KVSS Test can be used as an olfactory function test for Koreans.

비내시경을 이용한 안와 내벽 골절 정복 2예

김진국,남태욱,임채형,김재영,김정석 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-

Traditional surgical approaches to orbital medial wall fractures are either extraocular skin incision or indirect bicoronal flap. However these methods can leave remarkable orbital scar or scalp alopecia with possible complications. Endoscopic intranasal visualization of the medial orbital wall and lamina papyracea is a technique familar to otolaryngologists. This endoscopic view allows confirmation of fracture of medial orbital wall and herniation of orbital contents. Good visualization of the fracture can facilitate the anatomic reduction of orbital contents and the proper placement of orbital implant. Two cases of medial orbital wall fracture repaired by intranasal endoscopy using silastic sheet are reported.

후방 비출혈 환자에서 비내시경하 전기소작술의 치료효과

김재영,이민우,김진국,한창준,남태욱,임채형 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-

Background and Objectives : Epistaxis is a common disease from which approximately 10% of the normal population have suffered in their life. Most bleeding sites of epistaxis are located anteriorly and easily controlled. However posterior epistaxis presents significantly great problems. A number of different treatment modalities are used to control the posterior epistaxis. Although not widely practiced, the nasal endoscopic electrocautery has also been effective. The purpose of this article is to report on the efficacy of nasal endoscopic electrocautery as an alternative and adjuvant to the standard approach for control of posterior epistaxis. Materials and Methods: We conducted retrospective chart review about 19 cases of posterior epistaxis treated from January 1998 to December 1999. Group I patients were managed by nasal packing only and group II patients were managed by nasal packing and endoscopic electrocautery. Results: Hospital days were 5.9 days in the group I and 3.6 days in the group II. The duration of nasal packing was 4.1 days in the group I and 1.8 days in the group II. The results were significant statistically Conclusion: Nasal endoscopic electrocautery was an effective treatment modality for control of posterior epistaxis.

Actuation Behavior of a Carbon Nanotube/NafionTM IPMC Actuator Containing an Ionic Liquid

Hyoung-Tae Lim,Young-Tai Yoo,이장우 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3

A 1-ethyl-3-methylimidazolium trifluoroacetate ([EtMeIM][TA]) ionic liquid was investigated as an inner solvent for ionic polymer metal composite (IPMC) actuators reinforced with multi-wall carbon nanotubes (MWCNTs). The ionic liquid has a higher ion conductivity, a lower viscosity, and a wide electrochemical window compared to most organic solvents. The surface of the MWCNT was modified with an acid mixture to facilitate its homogeneous dispersion in a nanocomposite. The ion conductivity of the IPMC increased with the MWCNT loading. In a dry actuation, the sustainability of deformation under a DC potential and the durability of the IPMCs containing an ionic liquid were significantly improved compared to conventional IPMCs with water. In particular, the MWCNT nanocomposite IPMC displayed a larger displacement under a high frequency.d +"

An Iterative Multiuser Detection Technique for SC-FDE with Transmit Diversity

Hyoung-Jin Lim,Jong-Bu Lim,Tae-Won Yune,Gi-Hong Im 한국통신학회 2007 한국통신학회 학술대회논문집 Vol.2007 No.11

화학공장 방화설계를 위한 통합 체크리스트 개발

임태형(Lim, Tae-Hyoung),현길용(Hyun, Kil-Yong),김승권(Jin, Cheng-quan),현창택(Hyun, Chang-Taek) 대한건축학회 2018 대한건축학회 학술발표대회 논문집 Vol.38 No.2

In order to ensure fire safety of buildings especially for a chemical plant, it is necessary to understand the related regulations for fire safety accurately. It is important to develop an integrated checklist applicable from the design stage for the buildings. However, currently there aren"t effective checklists for architects/engineers, so potential problems related to fire safety are existed in the construction and maintenance of these buildings. In this study, it is suggested that the development of integrated checklist for fire protection design that can be applied in design phase for buildings, especially chemical plant.

Uniform vs. Non-uniform Energy Allocations for Cooperation-based Dynamic Spectrum Leasing via Auction

Hyoung-Jin Lim(임형진),Dae-Young Seol(설대영),Tae-Kyoung Kim(김태경),Gi-Hong Im(임기홍) 한국통신학회 2010 한국통신학회 학술대회논문집 Vol.2010 No.11

Application of 630-nm and 850-nm Light-emitting Diodes and Microcurrent to Accelerate Collagen and Elastin Deposition in Porcine Skin

Tae-Rin Kwon,Dong Wook Moon,Jungwook Kim,Hyoung Jun Kim,Seong Jae Lee,Yunhee Han,Hee Won Dan,Sang Hoon Chi,Hwan Mo Seong,Hee Jung Kim,Guei-Sam Lim,Jungkwan Lee 대한의학레이저학회 2021 MEDICAL LASERS Vol.10 No.2

Background and Objectives: Skin aging is reportedly associated with regulation in collagen and elastin synthesis. This study investigated the potential of combining light-emitting diode (LED) treatments using a 630-nm and 850-nm LED with simultaneous microcurrent application. Materials and Methods: The dorsal skin of female pigs was treated with a home-use device. We examined the treatment effects using photography, thermocamera, microscopic pathology, and histological examination to determine the mechanism of action, efficacy, and safety of the procedure. A histological observation was performed using hematoxylin and eosin, Masson’s trichrome, Victoria blue, and immunohistochemical staining. We also used the Sircol soluble collagen and elastin assay kit to measure the amounts of collagen and elastin in the porcine back skin tissue after 2 and 6 weeks. Results: Evaluation by visual inspection and devices showed no skin damage or heat-induced injury at the treatment site. Histological staining revealed that accurate treatment of the targeted dermis layer effectively enhanced collagen and elastin deposition. Collagen type I, a protein defined by immunohistochemical staining, was overexpressed in the early stages of weeks 2 and 6. Combined therapy findings showed the superior capability of the 630-nm and 850-nm LED procedures to induce collagen; in contrast, elastin induction was more pronounced after microcurrent treatments. Conclusion: The home-use LED device, comprising a combination of 630-nm and 850-nm LEDs and microcurrent, is safe and can be used as an adjunctive treatment for self-administered facial rejuvenation.