복부대동맥류를 동반한 환자의 위아전절제술 마취경험

임의재,이동준,김문철,이상준,김명화 인제대학교 2009 仁濟醫學 Vol.30 No.-

Abdominal aortic aneurysms rarely occur with cancerous lesion but occasionally with gastrointestinal malignancy, and need absolute blood pressure control to prevent rupture. A 71 year old male who complained dizzness and hematochezia. He has been managed for hypertension, stable angina and abdominal aortic aneurysm which diagnosed 2months ago. He was diagnosed as advanced gastric adenocarcinoma and subtotal gastrectomy was performed. General anesthesia was scheduled and epidural catheterization was performed to controll intraand post operative pain and minimize hemodynamic change to prevent aneurysmal rupture 37.5mg of Ropivacaine was injected through epidural catheter before anesthesia and infusion of remifentanyl and propofol was performed during general anesthesia. The blood pressure was maintained between 95/50 and 145/95 and did not significantly increased. The general-epidural combined method was successfully performed and we are report this case with a brief review of the literature.

소성시간에 따른 재생시멘트의 물성 평가

임승준,김세훈,오상균,김정길,강병희 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

Serious problems of the environment protection and resource exhaustion are exhibited, due to the increase of the construction materials and activation of the remodeling, recently. Especially, most of the advanced countries, recycling plan for the waste concrete is vigorously progressing. The recycle of domestic waste concrete is, however, still in an early stage, and it has been only partially being used for the road fillers. As a counter-plan of activating recycled concrete, we have confirmed the hydration possibility of the waste concrete powder from the experiment on recycling the aggregate powder since 2000. Also, we have known that the strength is increasing when the heating time is longer, and baking temperature maintain in 700℃. The purpose of this study is to determine the most suitable production method controlling the duration of baking time for recycled cement from the compressive strength, X -ray diffraction and ingredient analysis test.

구조용 중탄소강 SM45C의 열처리에 따른 기계적 성질변화

전상조,이임균,김송희 江原大學校 産業技術硏究所 1986 産業技術硏究 Vol.6 No.-

The aim of this study is to find out the relationships between the microstructures of SM45C(AIS11045) steel and fatigue crack propagation behaviour. Three microstructures such as (ⅰ) as received (fully annealed). (ⅱ) water quenched and tempered, and (ⅲ) ail quenched and tempered were used for fundamental mechanical testing and fatigue crack proagation test. The microstructures of (ⅱ) and (ⅲ) showed superior in tensile strength to (ⅰ). Resistance against fatigue crack propagation was higher in structure (ⅰ), while tensile properties were better in structures(ⅱ) and (ⅲ). It is believed due to that the enhancement of roughness of fracture surface obsered in structure (ⅰ) increases ?Kth and lowers fatigue crack growth rate. However it does not necessarily mean the quenched and tempered structures (ⅱ) and (ⅲ) are undesirable for the engineering component because fatigue limit in low cycle test appears usually higher in the microstructures of higher strength.

온라인 동조 PI 제어기법을 이용한 영구자석형 동기전동기의 속도제어기 설계

林相德,朴勝燁,全寅孝,崔重暻 창원대학교 공작기계기술연구센터 1999 연구업적집 Vol.1 No.1

본 논문은 브러시리스 직류 전동기의 속도제어를 위해 파라메타의 추정 없이 입력과 출력의 패턴을 관찰하여 PI 이득을 온라인(On-line)으로 설정하는 방법을 제안한다. 비례이득은 한계입력을 인가하여 가장 빠른 속도 상승을 유도하는 과정에서 설정되고, 적분이득은 비례제어 과정 중에 오버슈트 방지와 안정된 수렴이 적적히 이루어지도록 설정된다. 따라서 제안된 PI이득 조정은 온라인으로 제어와 동시에 수행됨으로써 시스템 파라메타 추정 등의 부가적인 작업이 필요 없다. 본 논문에서 제안하는 PI이득 조절기법은 직류전동기의 속도제어에 있어서 빠른 응답과 오버슈트 문제를 동시에 해결할 수 있고, 기존의 Auto-tuning 방법보다 간편하고 실용적이다. 컴퓨터 시뮬레이션과 실제 실험을 통하여 제안하는 방법의 유용성과 안정성을 보인다. In this paper, a method of on-line PI gain-tuning is proposed for the speed control of brushless D.C. motor by investigating the pattern of input and output without estimating parameter. Proportional gain is tuned in the process to obtain a fast speed response by supplying the maximum constant input And integral gain is appropriately tuned in the process of proportional control so that the response may be stably converged and the overshoot may be prevented. Therefore because both control and gain-tuning are executed concurrently, additional works that estimate parameters and so on aren't required in the proposed method. In the proposed method, both fast-response and overshoot problem are well solved, and it is mire useful and convenient than existing auto-tuning methods in the speed control of D.C motor. It is illustrated by simulations and experimental results that the proposed method is useful and stable.

대기오염과 천식증상에 의한 응급실내원과의 연관성에 관한 환자교차연구

임형준,이상윤,윤기정,주영수,강대희,조수현 대한산업의학회 2000 대한직업환경의학회지 Vol.12 No.2

Objectives : This study, using case-crossover design, search a relationship between changing levels of air pollutants and asthma attack in asthma patients. Methods : We searched the daily total number of asthmatic patients at hospital's emergency room in Seoul, Korea by investigating total 49 general hospital's emergency room records. Otherwise, We investigated medical records of asthmatic patients at one of the 49 hospitals we have searched. We investigated addresses that they are living, diagnosis, smoking history, whether respiratory infection or not, medications. We analyzed the data by 1:m conditional logistic regression used when matched case-control study is analyzed. Control periods were chosen by bidirectional paired matching technique 7, 14 days before and after case periods. Results : the relative risk of asthmatic attack by 100 ppm ozone increase between June and September were 1.348(95 % CI = 1.010∼1.619). Between November and February, the relative risk by 100 ㎍/㎥ TSP increase, 100ppb sulfur dioxide and nitrogen dioxide were respectively 1,278(1.010∼1.619), 1.237(1.019∼1.502), 1.285(1.006∼1.640). In stratified analysis, the relative risk were significant when the asthmatic patients were children aged 15 years or below, when there were respiratory infection, and when the patients took medications irregularly Conclusions : There was statistically significant association between ambient levels of air pollutants and asthmatic attack. So, we have to exert our efforts to minimize the air pollution effectively, to protect public health from air pollution.

Ⅱ급1류 부정교합 치료시 제1소구치 발거가 골격치성요소의 변화에 미치는 영향

임선준,김상철 원광대학교 생체재료·매식연구소 1999 원광생체재료·매식 Vol.8 No.1

The purpose of this study was to evaluate the changes of skeletodental factors in Class Ⅱ, division 1 malocclusion, following treatment with or without the extraction of four first premolars. one hundred and one treated cases were devided into four groups by sex and treatment type. Various skeletodental and facial factors in pre and post-treatment lateral cephalograms and study models were measured and compared by Students' t-test. The results were as follows; 1. There was a facial height reduction in extraction group. 2. Extraction treatment was more effective in retraction of upper incisors and lips. 3. Lower incisors were titled lingually in extraction group, but labially in nonextraction group. 4. Maxillary space deficiency was resolved by lateral maxillary expansion in nonextraction group.

다중 경로 채널 환경에서 PPM 기반의 초광대역 무선 통신 시스템의 수신기 구조

김성준,임성빈 崇實大學校 生産技術硏究所 2002 論文集 Vol.32 No.-

In this paper, we propose two receiver structures of the ultra wide-band (UWB) wireless communication system to improve its performance in multipath environments. Recently, the UWB communication system has drawn much attention for future high-speed wireless communication services. The conventional UWB receiver directly correlates received signals with the ideal reference waveform, which results in performance degradation for multipath environments. The key idea of the proposed receiver structure is to reflect the multipath characteristics into the UWB wireless communication system receiver. The first approach is to deconvolve the received waveform with estimates of the multipath gains to obtain the transmitted waveform while the other is to modify the reference waveform of the correlator according to the estimates of the multipath gains. We examined the performance of the proposed schemes for the statistical indoor wireless communication channel model using computer simulation.

폐목질을 사용한 시멘트보드의 물성에 관한 실험적 연구

황병준,정광식,강태경,김광기,임서형,정상진 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

Recently, as the alternatives to preserve environment such as effective usage of wastes or unusable resources are drawing attentions, researches and measures for the two tasks, which are reuse of waste wood and development of eco~friendly materials, are being examined and established in various fields. However, they are still insufficient. Therefore, in this study, for the efficient application of waste woods and eco~friendly effects, mortar was produced using sawdust as the waste wood and mineral material cement for combination, in order to produce inorganic boards using waste woods, which were made when sawing. The present study purposed to analyze the physical and dynamic characteristics of woody cement boards, which were made by modifying water~cement ratio for each wood inclusion rate based on a hardening~accelerator inclusion rate set in previous studies and, based on the findings, to provide basic data about the physical properties of inorganic boards made of waste wood, in order to produce woody cement boards using waste wood, which has problems in being used in the manufacturing of woody cement boards.

[18F]FDG PET을 이용한 강박증 환자에서 뇌 포도당 대사의 이상에 관한 연구

권준수,이동우,이재성,최정임,이동수,정준기,조맹제,이명철,류인균 대한신경정신의학회 2000 신경정신의학 Vol.39 No.2

연구목적: 강박증에 대한 기능적 뇌영상 연구들에서 강박증 환자들의 안와전두엽과 미상핵의 대사율 증가 소견이 비교적 일과되게 발표되어 왔으며, 전두-피질하 회로의 이상이라는 이론이 수립되기도 하였다. 그러나 기존의 연구들은 강박증의 유병기간에 따른 구분없이 시행된 연구였고, 영상분석 방법에 있어서도 관심영역 방법을 이용했다는 한계를 지니고 있다. 본 연구의 목적은 첫째, 강박증의 유병기간에 따라 환자군을 구분하여 PET 영상소견을 분석함으로써 유병 기간에 따른 차이가 있는지를 조사하였으며, 둘째, 강바증 환자의 포도당 양전자방출 단층촬영(18-Fluor-deoxyglucose Positron Emission Tomography : FDG-PET) 영상분석에 통계적 매개변수 지도법(Statistical Parametric Mapping : SPM)을 이용함으로써 강박증의 병인기전 및 강박증상과 뇌기능 간의 관계를 명확히 규명하고자 하였다. 방법: 구조적 면담도구(Structured clinical interview for DSM-IV : SCID-IV)를 적용하여 진단된 12명의 강박증 환자들과 10명의 정상 대조군에 대해 FDG-PET을 촬영하여 SPM으로 분석하였다. PET 촬영 전 적어도 4주 동안에는 약물복용을 하지 않은 상태였다. 결과: 1) 환자군과 대조군의 비교 : 강박증 환자군은 대조군에 비해 양측 두정 영역의 대사율이 유의하게 감소되어 있었으며(P<0.01). 대사증가를 보인 영역은 없었다. 강박증의 유병기간이 10년 이상인 만성강박증 환자 4명은 양측 안와전두엽에서 유의한 대사증가 소견을 보였으며(P<0.01), 양측 두정영역에서 유의한 대사감소 소견을 보였다 (P<0.01), 유병기간이 10년 이하인 환자에서는 전체 환자군의 분석에서와 마찬가지로 대조군에 비해 유의한 대사증가 소견을 보인 영역은 없었으며, 양측 두정엽 부위에서 유 의한 대사 감소 소견을 보였다.(P<0.01). 2) 강박증상의 심각도와의 상관관계 분석 : 우측 두정엽의 대사율은 강박장애 척도 점수와 유의한 음의 상관관계를 보였으며(p<0.01), 양측 시상 영역의 대사율은 예일-브라운 강박장애 척도의 강박장애척도 점수와 유의한 양의 상관관계(p<0.01)를 보였다. 결론: 본 연구는 결과는 기존의 연구들에서 보고된 안와전두엽의 대사 증가 소견이 강박증의 만성화로 인해 나타나는 2차적 장애이며, 두정엽의 대사 저하가 보다 1차적인 장애일 가능성을 시사한다. Baxter가 수립한 전두-피질하 회로 이론은 두정엽의 이상을 포함하는 전두-두정엽 복합체 이론으로 확장되어야 할 것이다. Objectives: Functional imaging studies on obsessive-compulsive disorder(OCD) subjects have repeatedly reported increased metabolism in orbitofrontal lobes and caudate nucleus, resulting in the "frontal-subcortical" circuit abnormality theory. Limitations of the previous studies to date include little consideration for the duration of illness, and the use of regions of interest methods, as an image analysis method. Our study objectives are 1) to include the duration of illness as an important study variable, and 2) to use Statistical Parametric Mapping(SPM) method in order to tap relations between the brain function and the psychopathology and symptoms of OCD. Methods: The [18] fluorodeoxyglucose positron emission tomography(FDG-PET) scans of OCD subjects and normal comparison subjects, as diagnosed by the Structured Clinical Interview for DSM-IV(SCID-IV), were analyzed using SPM. Results: 1) Comparison of OCD and control groups : OCD subjects had significantly decreased metabolism in both parietal lobes and didn't have any areas of increased metabolism in comparison to comparison subjects(p.<0.01). four OCD subjects with the illness duration of 10 years or longer, had significantly increased metabolism in both orbitofrontal lobes<p<0.01). OCD subjects whose illness duration is shorter than 10 years didn't have any areas of increased metabolism and had significantly decreased parietal lobe metabolism, as in the analyses of all subjects(p<0.01). 2) Correlation analysis between areas and symptom severity : Metabolism of both thalamic sreas showed significant positive correlation with Yale-Brown Obsessive-Compulsive Scale(Y-BOCS) scores(p<0.01). Metabolism of right parietal area showed significant negative corre lation with Y-BOCS scores(p<0.01). Conclusions: The current findings suggest that the increased metabolism in orbitofrontal lobe, previously rported, may be a secondary phenomenon due to the extended illness dur- ation and that decreased metabolism in the parietal lobes are primary abnormality in OCD subjects. Thus Baxter's fronto-subcortical circuit theory should be extended into "fronto-pari-etal" complex theory, which includes the parietal lobes.

기도분비물에 의한 기관 내 튜브의 부분 폐쇄

이상준,이동준,김문철,임의재,김명화 인제대학교 2009 仁濟醫學 Vol.30 No.-

During anesthesia, unexpectedly endotracheal tube obstruction cause seriouscomplications which require early diagnosis and immediate management. Endotracheal tube obstruction with foreign body is rare. 74 year old man was scheduled for open lung biopsy. The patient was intubated with a 7.5 mm reinforced endotracheal tube and turned to the right lateral position. After 30 minute, signs of partial endotracheal obstruction was observed including high airway pressure and decreased end-tidal CO2. A suction catheter was not deeply advanced. A wheezing - like sound was heard. We temporarily stopped the operation and turned the patient to supine. We exchanged the tube with another one and found impacted mucous secretions at the distal tip of the tube.