자기공명영상용 라디오주파수 코일의 제작에 있어서 동조 및 매칭에 영향을 미치는 전기 용량 값들의 실험적 측정

양경승,신용진,김영섭,한재진,이성길,김승국,김영근,지연상 조선대학교 기초과학연구소 2003 自然科學硏究 Vol.26 No.-

Radio frequency coil which is capable of transmit and receive the signal has been used for image production in magnetic resonance imaging(MRI). Tuning and matching characteristic of radio frequency coil is major factor determining the image quality. In experiment the used coil was called a staircase type coil which is simplified the birdcage coil and referred to a simple LC resonant circuit. Because the inductance values of the coils are fixed coil performance was examined by changing of the capacitance values. In this study capacitance values were experimentally determined to increase of-tuning and matching effect in junction of the coil between coil endring and BNC cable to obtain the high quality of image.

염산용액에서 PC88A에 의한 Sm의 용매추출

이만승,이광섭,이진영,김성돈,김준수 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.10

Solvent extraction experiments of Sm were performed from chloride solution with PC88A and saponified PC88A. Solvent extraction reaction of Sm with PC88A and the corresponding equilibrium constant were evaluated from the experimental and ionic equilibria data as follows Sm^(3+)_(aq)+ 1.5H₂A_(2,org)= SmA_(3,org)+ 3H^(+)_(aq) , K = 0.33. The predicted distribution coefficients of Sm agreed well with the experimental results. The distribution coefficients of Sm with saponified PC88A and the values of equilibrium pH depended on the initial extraction conditions. When the concentration of PC88A was in excess of that of Sm, saponification of PC88A greatly enhanced the extraction of Sm. (Received June 21, 2004)

비누화 PC88A에 의한 NdCl₃와 SmCl₃용매추출의 화학모델

이만승,이광섭,이진영,김성돈,김준수 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.10

A chemical model was developed to estimate equilibrium constant for the solvent extraction of Nd and Sm from chloride solution with saponified PC88A. The model could be employed to predict the distribution coefficient of metal from the initial extraction conditions. The model consisted of chemical equilibria, mass balance, charge balance and solvent extraction reaction. By applying the model to the experimental conditions and data, equilibrium constants for the solvent extraction of Nd and Sm were obtained. The effect of the saponification of PC88A on the extraction of Nd was explained in terms of the equilibrium constant obtained in this study and the change of equilibrium pH. The predicted distribution coefficients of Nd and Sm agreed well with those measured. (Received July 14, 2004)

다중주파수·다중성분 고막운동도에 관한 연구

소원섭,이지연,강희라,손원진,허승덕 대구대학교 특수교육재활과학연구소 2012 再活科學硏究 Vol.30 No.1

이 연구는 이학적·청각학적 정상 소견을 가진 성인들의 다중주파수 고막운동도(multi-frequency tympanogram, MFT)와 다중성분 고막운동도(multi-component tympanogram, MCT)의 특성을 알아보고자 하였다. 연구 참여자는 D대학교 재학 중인 19명(M:F=9:10, 만 19∼23세)으로 하였다. MCT는 각 성분(admittance; Y, susceptance; B, conductance; G)별 정점의 수를 확인하였고, MFT는 200 ㎐부터 2 ㎑ 순음에 대한 고막 긴장 및 이완상태에서 전도율을 통해 공명주파수와 ΔB, Δ∅를 각각 구하였다. MCT는 668 ㎐ 자극에 대해 47.4 %가 1Y1B1G를, 52.6 %가1Y3B1G를 보였고, MFT의 공명주파수는 829~1,213(1,021±192) ㎐, ΔB와 Δ∅의 평균은 각각 –0.18, -19.3으로 관 찰되었다. This study will be to confirm the characteristic of Multi-component tympanogram(MCT) and Multi-frequency tympanogram(MFT) of adults who have physical and audiological normal findings. Participants were 19 students(M:F = 9:10) who are attending D-university. MCT checked the number of peaks per each component(admittance; Y, susceptance; B, conductance; G) and MFT got the resonance frequency through the conductivity rate of tympanic membrane's tense and relaxation state, and ΔB, Δ∅ respectively. 47.4% of MCT showed 1Y1B1G about 668 ㎐ stimulus and 52.6% of that showed 1Y3B1G. Resonance frequency of MFT was 829~1,213(1,021±192) ㎐, and the average of ΔB and Δ∅ was observed -0.18, -19.3 respectively.

염산용액에서 비누화 PC88A에 의한 용매추출로 Gd와 Sm의 분리

이만승,이광섭,이진영,김성돈,김준수 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.5

Solvent extraction experiments have been performed to separate Gd and Sm from chloride solution with PC88A and saponified PC88A. The effects of extraction conditions on the distribution coefficients of Gd and Sm were investigated. The distribution coefficients of Gd were higher than those of Sm in the experimental ranges of experimental conditions of this study. A solvent extraction model was developed to predict the distribution coefficients of metals and separation factor between Gd and Sm from the initial extraction conditions. The measured distribution coefficients of Gd and Sm with PC88A and saponified PC88A showed good agreements with the predicted values. (Received March 3, 2005)

기초직업능력표준 제도화 방안

나승일,정철영,김주섭,구자길,김강호,장현진 한국농업교육학회 2008 농업교육과 인적자원개발 Vol.40 No.2

이 연구의 목적은 기초직업능력표준의 활용성 제고를 위해, 직업교육훈련 및 자격제도에 기초직업능력표준의 도입 방안과 법적·정책적 제언을 하는데 있었다. 연구목적 달성을 위해 문헌고찰, 내용분석, 조사연구, 전문가협의회 등의 연구방법이 활용되었다. 기초직업능력표준 제도화 방안 개발을 위해 기초직업능력표준의 자격도입 및 교육훈련에의 활용에 필요한 인프라를 구축하고 이를 법적으로 규정하는 것을 기본방향으로 설정하였다. 기본 방향에 따라 ① 기초직업능력 자격은 국가기술자격에 표준을 반영하거나 신설하되 응시자격에 제한을 두지 않고, 결과인증 방법을 통해 3등급으로 구분한다. 단, 직업윤리는 등급을 구분하지 않고 합격과 불합격의 단일동급을 적용한다. ② 기초직업능력표준을 학교 교육과정 및 훈련기준에 반영하되 기존 교과에 반영하거나 별도 교과를 신설한다. 이를 위해 학습자, 교육훈련기관, 자격검정기관, 인프라 차원의 지원이 요구된다.③ 기초직업능력 교육훈련과 자격의 연계를 위해 교육훈련이수자에게 자격시험의 일부 또는 전체를 면제하도록 한다. ④ 기초직업능력표준의 관리 · 운영은 한국산업인력공단에서 담당하되 주요 심의사항은 자격정잭심의위원회에서 주관하도록 한다. 제도화 방안의 실제 적용을 위해 자격기본법, 근로자직업능력개발법 등의 관련 법제 정비를 위한 제언을 제시하였으며, 제도화의 효율적인 추진을 위한 정책적 제언을 제시하였다. The purpose of this study was to develop the introduction plan and to identify the revision points of laws and the political implications related with basic competencies standards for improving utilization based on vocational training and qualification. For the purpose, literature reviews, contents analysis, survey and experts council were conducted. This study suggested the basic framework which was building infra and legislation consolidation required on establishment qualifying system and improvement utilization to institutionalize the basic competencies standards. According to this, ① basic competencies qualification should be considered on national technical qualification and be graded 3 levels through summative evaluation without application requirements. But vocational ethics must be under the pass-fail system. ② It should be make the best use of basic competencies standards on schooling curriculum and vocational training standards by means of modifying existing courses or creating new courses. For this, it need to support learners, training and education institutions, qualifying test institutions, and infra. ③ Individuals who complete the course should be exempt on whole or partial exam for linking between training and qualification. ④ Management and operation of basic competencies standards should be controled by Human Resource Development Service of Korea, and the right to deliberate need to be authorized by Qualification Policy Deliberation Committee. To realize institutionalization, this study suggested consolidating the related laws including Framework Act on Qualifications, Workers' Vocational Competency Development Act, and so on. Moreover, it recommended political proposal for effective actualization of institutionalization.

EEMR 관을 이용한 식도 과립세포종의 제거 1예

문정섭,유권,전영빈,정원종,양대열,이승진 대한소화기내시경학회 1999 Clinical Endoscopy Vol.19 No.4

The granular cell tumor was first described in 1926. Recently, it has been suggested that the tumor is Schwann cell in origin, and this notion has been supported by electron microscopic studies and immunohistochemistry of the S-100 protein. The most frequently involved organs include the tongue, skin, breast, and digestive tract. The esophagus is rarely involved. The treatment of choice for an esophageal granular cell tumor is still controversial. The traditional treatment has been surgical excision, but new therapeutic options, including laser surgery, diathermy loop, and multiple biopsies have recently been tried. An endoscopic esophageal mucosal resection (EEMR) tube, originally designed for resection of early esophageal cancer, is widely used nowadays. A case of a granular cell tumor of the esophagus, which was successfully removed by an EEMR tube, is herein reported.

구강악안면 영역의 치성 감염 환자에 대한 세균학적 연구

김일규,윤승환,오성섭,최진호,오남식,김의성,이성호,배수환,강문수 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.4

Oral & maxillofacial infections are most commonly odontogenic in origin. Although such infections are usually self-limiting, they may occasionally spread deeply into fascial spaces or planes far from the initial site of involvement. If early diagnosis and appropriate therapy is delayed, complications such as mediastinal extension, retropharyngeal spread and airway obstruction could happen to the patients. For the study of the microbiology, we have retrospectively analysed the oral & maxillofacial infected patients in the Dept. of Oral & Maxillofacial Surgery, In-Ha University Hospital from 1997 September to 2000 April. The results were as follows 1.The male patients were more common than female, with male 61.9% and female 38.1%. 2.Dental originated infections were most common cause with the incidence of 62%. 3.Most common fascial space involved was buccal space 42cases(37.2%) followed by submandibular space 13cases(11.5%), infraorbital space 13cases(11.5%), masseteric space 11cases(9.7%) , periapical abscess 11cases(9.7%) . 4.The causative organisms isolated from the pus culture were Gram Positive Bacterial species, which were 46cases(31.9%) of Streptococcus viridans, 16cases(8.6%) of α and β-hemolytic streptococcus, 4cases(3.1%) of Strep.-group D non enterococci, 7cases(5.1%) of Staphylococcus Coa. Neg., 5cases(3.9%) of Staphylococcus aureus, 3cases(2.3%) of Enterococcus faecalis, 1case(0.8%) of Bacillus species, 1case(0.8%) of Peptostreptococcus, 1case(0.8%) of Clostridium and Gram negative bacterial species, which were 4cases(3.1%) of Acinetobacter baumannii, 2cases(1.6%) of Pseudomonas aeruginosa, 2cases(1.6%) of Burkholderia cepacia, 1case(0.8%) of Neisseria species, 1case(0.8%) of Klebsiella pneumoniae, 1case(0.8%) of Klebsiella oxytoca, 1case(0.8%) of Escherichia coli. 5.In drug sensitivity test, high resistant tendency was found in Penicillin system(Penicillin G 83.3%, Ampicillin 60%) and Aminoglycosides (Gentamycin 50%, Tobramycin 45.5%), but tertiary Cephalosporin system(Cefoperazone 9.1%, Ceftazidime 18.2%), and glycopeptides system (Teicoplanin 0% , Vancomycin 0%) showed lower resistancy.

부착형 고분자 압전센서를 이용한 탄성파 검출 연구

김기복,윤동진,권재화,이영섭,이승석 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1

스마트 구조물에 적합한 탄성과 검출 센서로서 고분자 압전 필름을 이용한 부착형 센서에 대한 연구를 수행하였다. PVDF와 copolymer에 대하여 센서로서의 특성을 평가하였으며 상용화된 PZT 센서와 비교하였다. 탄성과 속도와 음향임피던스가 서로 여러 가지 재료에 고분자 압전필름 센서를 부착하여 연필심 파괴 시 발생하는 탄성파를 검출하여 분석하였다. 센서의 직경이 증가함에 따라 검출 신호의 피크 전압은 증가하였으나 센서의 dynamic range는 감소하는 것으로 나타났다. 시편의 음향임피던스가 감소할수록 검출신호 파형의 피크 값은 증가하였으며 주로 저주파수의 주파수 성분의 신호에 민감한 것으로 분석되었다. Copolymer 센서가 PVDF 센서보다 감도 면에서 다소 양호한 것으로 나타났다.

단 1차형 영구자석 선형 동기전동기의 디텐트력 저감 연구

연승환,이종진,함승진,고창섭 충북대학교 컴퓨터정보통신 연구소 2006 컴퓨터정보통신연구 Vol.14 No.1

최근 영구자석 선형 동기 전동기 (PMSLM)는 이송 장치로써 많은 분야에 사용되고 있다. 영구자석 선형 동기 전동기는 구조적으로 간단하며 고속화 고추력화 등의 많은 장점을 가지고 있다. 그러나 단 1차형 영구자석 선형 동기 전동기는 매우 큰 디텐트력을 지니고 있어 추력 맥동의 원인이 되며, 이는 소음과 진동을 발생시킨다. 단 1차형 영구자석 선형 동기 전동기의 디텐트력은 전기자 내부의 치와 영구자석 사이에 작용하는 힘과 전기자 양 단부와 영구자석 사이에서 작용하는 힘의 합으로 표현된다. 본 논문에서는 코깅력을 줄이기 위한 방법으로 영구자석의 극 수와 전기자의 슬롯 수의 비를 변경한 새로운 구조의 단 1차형 영구자석 선형 동기 전동기(PMLSM)을 제안하였고, 단부력을 줄이기 위하여 전기자 양 단부에 전기자 길이 조정법과 챔퍼링 법을 사용하였다. Recently Permanent Magnet Linear Synchronous Motors(PMLSMs) are widely being used for many linear transportation applications. The PMLSMs have many advantages such as simple structure, high speed and thrust force. However, especially in short primary type PMLSM, the PMLSMs have very large detent force, which makes the thrust force ripple and undesired vibration and noise. The detent force in PMLSMs is composed of two forces. The first is the cogging force which comes from the interaction between the permanent magnets and interior teeth of the stator, and the second is the end effect force which acts on the exterior teeth of the stator by the permanent magnets. This paper presents a new configuration of a short primary type PMLSM for cogging force reduction by changing the ratio of the numbers of winding slots and permanent magnet poles. The end effect force is also minimized by optimizing the stator length and chamfering the shape of the exterior teeth of the stator.