의과대학 홈페이지 제작의 경험

변성완,김승철,조선희,배영숙 梨花女子大學校 醫科大學 醫科學硏究所 1998 EMJ (Ewha medical journal) Vol.21 No.4

목적: 이화여자대학교 의과대학의 홈페이지를 개발하는 과정에서 있었던 경험을 문서화하여 향후의 정보화 매체 제작에 참고자료를 제시하고자 한다. 방법: 인적 및 하드웨어 자원을 효율적으로 활용하여, 홈페이지의 내용과 형식을 구성하도록 몇가지의 개발 원칙을 세웠다. 결과: 홈페이지는 이화여자대학교 소속의 web server(mm.ewha.ac.kr)에 구현되었으며, 구현된 계층구조와 내용은 개발 원칙에 부합하였다. 결론: 향후 유사한 정보화 매체의 개발과 각 교실의 홈페이지에 대한 유지, 보수 작업에 도움이 될 자료로 사료된다. Objectives : Experience in development of home pages for Ewha Womans University College of Medicine were documented to present references for future development of informatics media. Methods : Development principles were established for the optimal allocation of human and hardware resources, and for the effective construction of contents and structures of the home pages. Results : Home pages were implemented on a web server(mm.ewha.ac.kr) in Ewha Womans University. Their structural hierarchy and contents were determined according to the principles described earlier. Conclusion : The author's experiences will be helpful for the enhancement and maintenance of the home page of each department and for the future development of similar informatics media.

Normal Mastoid Air Cell System Geometry: Has Surface Area Been Overestimated?

변성완,이승신,박진영,유정현 대한이비인후과학회 2016 Clinical and Experimental Otorhinolaryngology Vol.9 No.1

Objectives. The aim of this study was to emphasize the necessity of a standard in segmentation threshold and algorithm for measuring volume and surface area of mastoid air cell system (MACS). Methods. First, we obtained axial computed tomography scans of 54 normal temporal bones from 27 subjects. Then, we manipulated Hounsfield units (HU) image data in DICOM (digital imaging and communications in medicine) files directly using our program. The volume and surface area of MACS were computed and compared at segmentation thresholds (HU) from –700 to 0 at intervals of 50 using 2 algorithms; square pixel based (SP) algorithm and marching square (MS) algorithm. Results. No significant difference was found between the volumes computed by SP and MS algorithms at each segmentation threshold. The surface area computed by SP algorithm, however, was significantly larger than that by MS algorithm. We could minimize this significant difference through a modification of the SP algorithm. As the lower HU threshold value was set, the smaller volume was measured. The surface area showed a plateau at a threshold of approximately –200 HU. The segmentation threshold had greater influence on the measured volume of MACS than the algorithm did. Conclusion. A standard method for measuring volume and surface area of MACS is thought to be necessary. We suggest that the MS algorithm and –200 HU of the threshold could be a standard in the measurement of volume and surface area of MACS.

가중 장애 적용의 청각 손상에 대한 배상의학적 고찰

변성완,이승신,박지수,김수진 대한이비인후과학회 2013 대한이비인후과학회지 두경부외과학 Vol.56 No.9

Background and Objectives When a disability is superimposed on a previous disability, the concept of aggravation of disability should be applied. In rating the disability for hearing loss, we focused on the aggravation of disability and the methods of assessment. Subjects and Method For the past 12 years, we have provided legal advisory for 111 cases of hearing injury, for which disability had to be rated. In 11 of those 111 cases, disability was assessed in consideration of aggravation of disability. We assessed disability using three rating methods: they were based on 1) a change of hearing level from assumed normal, 2) apportionment of new hearing injury in final hearing, and 3) a change in disability rating. We evaluated for significant differences and correlations between the values obtained by each method. Results There was a significant difference between the results by the methods 1 and 2. The disability rating by the method 2 showed good correlations with those assessed by the methods 1 and 3. Conclusion When considering aggravation of disability in hearing, the method 2 could be a good alternative when the standard method 3 is inappropriate.

단음절어표의 제작에서 종성과 관련된 음소 빈도의 조정

변성완,오승하,채성원,박시내,심유진,조근경 대한이비인후과학회 2007 대한이비인후과학회지 두경부외과학 Vol.50 No.7

Background and Objectives:Several investigators have developed word lists for Korean speech audiometry. Many variations audiometry. In this study, we propose new monosylabic and bisylabic word lists, whose performances can be compared with those of previous word lists, verified in clinical situations, and revised in future with proper reasons. We also report why some compromises have ben made in the words number and the phoneme frequencies of the new monosyllabic word lists. There was no compromise in those of the new bisyllabic word list. Materials and Method:The target frequencies of new lists were determined by the previous references. In the Korean dictionary, 410 famThese words were arranged in a matrix of initial consonants and vowels to met the phonetic balance condition. Results:Two monosylabic word lists were developed with abovementioned compromises for the lack of monosylabic words with final consonants. One bisylabic word list could be made without compromise. Conclusion:The arrangement method in this report has some advantages in diversifying sylable distribution and satisfying the phonetic balance condition. The new monosylabic (Korean J Otorhinolaryngol-Head Neck Surg 2007 ;50 :573-8)

Molecular Diagnosis of Streptococcus pneumoniae in Middle Ear Fluids from Children with Otitis Media with Effusion

변성완,김한울,윤서희,박인호,김경효 대한소아감염학회 2015 Pediatric Infection and Vaccine Vol.22 No.2

Purpose: The long-term administration of antibiotics interferes with bacterial culture in the middle ear fluids (MEFs) of young children with otitis media with effusion (OME). The purpose of this study is to determine whether molecular diagnostics can be used for rapid and direct detection of the bacterial pathogen in culture-negative MEFs. Methods: The specificity and sensitivity of both polymerase chain reaction (PCR) and loop-mediated isothermal amplification (LAMP) to the lytA gene of Streptococcus pneumoniae were comparatively tested and then applied for pneumococcal detection in the clinical MEFs. Results: The detection limit of the PCR assay was approximately 104 colony forming units (CFU), whereas that of LAMP was less than 10 CFU for the detection of S. pneumoniae . Both PCR and LAMP did not amplify nucleic acid at over 106 CFU of H. influenzae or M. catarrhalis , both of which were irrelevant bacterial species. Of 22 culture-negative MEFs from children with OME, LAMP positivity was found in twelve MEFs (54.5%, 12/22), only three of which were PCR-positive (25%, 3/12). Our results showed that the ability of LAMP to detect pneumococcal DNA is over four times higher than that of PCR (P <0.01). Conclusions: As a high-resolution tool able to detect nucleic acid levels equivalent to <10 CFU of S. pneumoniae in MEFs without any cross-reaction with other pathogens, lytA -specific LAMP may be applied for diagnosing pneumococcus infection in OME as well as evaluating the impact of a pneumococcal conjugate vaccine against OME.

편측 성대마비 22례에 적용한 피열연골내전술과 갑상연골성형술의 비교

변성완,김춘동,홍순관 梨花女子大學校 醫科大學 醫科學硏究所 1998 EMJ (Ewha medical journal) Vol.21 No.3

연구목적: 편측 성대마비의 임상상을 파악하고, 이에 대해 시행되는 갑상연골성형술과 피열연골내전술의 성적을 비교해보고자 하였다. 방법: 다양한 원인으로 발생한 22례의 편측 성대마비에 대해서 피열연골성형술 또는 갑상연골성형술을 시행하고, 주관적인 만족도 및 수술 전후의 최대발성시간의 변화를 통계적으로 비교하였다. 결과: 1) 원인으로는 특발성이 7례, 흉부병소에 의한 것이 6례, 갑상선 수술에 후발한 것이 3례, 경부종괴절제수술에 후발한 것이 3례, 경부 외상에 의한 것이 2례, 디프테라이가 1례였고, 좌측 성대마비가 15례, 우측 성대 마비가 7례였다. 2) 갑상연골성형술에서 최대발성시간은 술전 평균 4초에서 술후 평균 6초로 유의하게(p=0.006)증가하였으며, 피열연골내전술에서도 술전 평균 5초에서 술후 평균 10.5초로 유의하게(p=0.014)증가하였다. 주관적인 만족도와 최대발성시간에 있어서 피열연골내전술이 더 좋은 결과를 보였다(p=0.0011). 합병증은 없었다. 결론: 편측 성대마비의 치료에 있어서 갑상연골성형술과 피열연골내전술은 모두 유용한 방법이지만, 환자의 만족도에서나 최대발성시간으로 볼 때 피열연골내전술에서 더 좋은 결과를 관찰하였다. Objectives : This study was performed to compare postoperative results of thyroplasty typeⅠ and arytenoid adduction, which were recent phonosurgical procedures for the management of unilateral vocal cord paralysis. Methods : Twenty-two cases of unilateral vocal cord paralysis with several etiologies were managed with thyroplasty typeⅠ and/or arytenoid adduction. The subjective and MPT(maxi-mum phonation time) improvements after those procedures were compared statistically. Results : The cause of paralysis were idiopathic(7 cases), thoracic lesion(6 cases) thyroi-dectomy(3 cases), neck mass excision(3 cases), neck trauma(2 cases) and diphtheria(case). The left side(15 cases) was paralyzed more frequently than the right(7 cases). There were significant increase(p=0.006) in MPT from 4 seconds preoperatively to 6 seconds postoperatively in thyro-lasty cases, and also significant increase(p=0.014) from 5 seconds to 10.5 seconds in arytenoid adduction cases. Better result were observed in subjective improvement and MPT(p=0.0011) with arytenoid adduction. There was no significant complication. Conclusion : Both arytenoid adduction and thyroplasty were effective and safe phonosurgical procedures for unilateral vocal cord paralysis. Better results were observed in arytenoid add-uction cases.

중이염 수술 자료 입력과 동시에 작성되는 자동 수술기록표 시스템의 개발

변성완,정수연,정일회,박진영 대한이비인후과학회 2012 대한이비인후과학회지 두경부외과학 Vol.55 No.1

Background and Objectives It takes considerable time and effort to make an operation record for the chronic otitis media. Also there are risks of incorrectness or omission of data. We developed an automatic operation recording system in order to reduce the burden of the resident keeping the record and to give completeness to the operation data. Materials and Method The model-view-controller (MVC) pattern isolates the domain logic (controller) from the user interface (data model-view), permitting independent development. We used the MVC pattern to design the program it since it matched with the feature of the operation recording system. Results We implemented this system using the Python programming language, which is composed of 98 fields and 4 different types of widgets linked to those fields. The outputs of the 4 views can be easily copied and pasted to the word processor and the electronic medical recorder. In the pilot test, this system reduced significant amount of time and effort needed for operation recording. Conclusion The automatic operation recording system reduces the resident’s works and the operation data loss. Furthermore, it could be applied to other types of operation records.

안테나 근역장과 인접 전송선로와의 전자기 결합 분석에 대한 연구

변성완,이현재,나완수 한국전자파학회 2023 한국전자파학회논문지 Vol.34 No.7

In this paper, we propose a method to predict the interference from antenna near-field coupling to a nearby transmission line. It is assumed that the interference from the antenna to the nearby trace is an electromagnetic field that traces the coupling in a smartphone. Based on the Maxwell and telegrapher equations, a new model is proposed to calculate the noise transferred to the trace in the antenna near-field area. This was verified using plane-wave cases in prior research. Subsequently, the antenna and victim trace were designed to calculate the near-field noise. The proposed model shows a significantly similar result to that of the 3D EM simulation. It is especially notable not only it is able to save 70 % of time compared with 3D simulation, but also it is possible to predict how to reduce coupled noise by direction of trace.

청각 손상의 신체 장애율 평가 체계의 보완: 선형 회귀분석의 적용

변성완,신승호,김소정,박지수 대한이비인후과학회 2014 대한이비인후과학회지 두경부외과학 Vol.57 No.11

Background and Objectives According to the correlation between hearing injury and McBride disability rating presented by previous studies, there are over/underestimated cases particularly in the 40 dB hearing range compared to other ranges. In this study, we reviewed the overestimated and underestimated data and propose a complementation scheme for a disability rating system by using the linear regression analysis. Subjects and Method For the past 14 years, we have provided legal advisory for 121 cases of hearing injury, for which disability had to be rated. We reviewed all but excluded 11 cases for the aggravation of disability. A regression equation was produced from a linear regression analysis that used the percent of hearing handicap (AAO-HNS/AMA-1979 formula) as an independent variable (x) and McBride disability rating (%) as a dependent variable (y), following the Pearson correlation test. Iterative calculation was performed for overestimated (18) and underestimated (8) cases. Results Appropriate disability ratings were 14% for the cases overestimated to 20% and 11% for those underestimated to 5%. Appropriate disability ratings for the 20% of overestimated cases were changed to 14%, and for the 5% of the underestimated cases, the disability ratinb 11%. Iterative calculation showed that the Pearson correlation index was improved from 0.8866 to 0.9065 and the determination coefficient of regression analysis (adjusted R-square) was improved from 0.784 to 0.8202. Conclusion The common range of hearing injury, which falls between 30-40 dB corresponds to the percentage of hearing handicap of 7.5-22.5%. A fairer assessment of ability rating would be possible by complementing some parts of this hearing range. Korean J Otorhinolaryngol-Head Neck Surg 2014;57(11):748-51

HTML과 Microsoft Access를 이용한 의학 문제 은행의 전산화(의학 문제 은행)

변성완,홍순관 대한의료정보학회 1998 Healthcare Informatics Research Vol.4 No.2