Superolateral Orbital Rim Craniotomy for Middle Cerebral Artery Aneurysms

Jeon, Byung-Chan,Peng Zhao,Zheng, Yongri KOSIN UNIVERSITY COLLEGE OF MEDICINE 2006 高神大學校 醫學部 論文集 Vol.21 No.1

Objective : Recently, several approaches for middle cerebral artery aneurysms (MCA) have been developed from conventional method, that is pterional approach. However, the literatures contain no report about minimally invasive surgery for the treatment of MCA aneurysms. So the purpose of our study is to describe a new technique, that is superolateral orbital rim craniotomy (SLORC) approach-minimally invasive surgery and the outcome for the treatment of MCA aneurysms. Methods : A retrospective review of 12 patients with MCA aneurysms ruptured or unruptured who were operated by SLORC approach was performed during October 1999 thru December 2001. Results : All the aneurysms were clipped successfully. The mean aneurysm size was 6.8 mm ranged from 4 to 15 mm. The average hospital stay was 15.9±9.1 days and the operation time usually consumed 3 to 4 hours. No patients died and adverse effects directly related with surgery were minimal. Cosmetic result was also achieved just a few days after operation. We never used lumbar drain or extraventricular drainage. During operation, less retraction of neural structure and no transfusion were required. The modified Rankin scores at discharge and 6 months afterwards revealed 0 grade in all assessed patients. Conclusion : The SLORC is a newly developed procedure for neurosurgeon to treat MCA aneurysms. Although this technique is not widely used, it is likely that this minimally invasive approach will become a promising operative technique in the future.

지역별 건설업 인력수급 현황 분석에 관한 연구

전찬민,전용일,황찬수,박태근 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

In currency crisis(IMF relief loan), the construction industry has prepared a foundation for existence by taking such desperate countermeasure as reducing a lot of construction companies and readjusting the their structure. Even though a number of employee of construction industry came to a million in 1996, it reduced to 980 thousand in 1997 and 710 thousand in 1998. After 1998, there was the trend about reducing a number of employee every year. The final goals of this study have inquired into the current situation of manpower supply and demand per region, compared and analyzed the circumstance of manpower supply and demand, and utilized references in decision-making between construction companies and students.

Effect of two different calcium hydroxide paste removal techniques on apical leakage : an electrochemical study

Park, Chan-Je,Jeon, Kyung-A,Kwon, Ho-Beom 大韓齒科保存學會 2006 Restorative Dentistry & Endodontics Vol.31 No.3

본 연구의 목적은 근관내 약제로 사용되는 수산화칼슘의 제거방법이 근관충전 후 치근단 미세누출에 미치는 영향을 알아보기 위함이다. 70개의 발거된 단근치를 엔진구동형 ProFile로 근관형성한 후 수용성 수산화칼슘 제제를 1주일간 적용하고 두 군으로 나누어 각기 다른 방법으로 제거하였다. A군은 NaOCI로 근관세정만을 시행하였으며, B군은 근관형성 시 사용된 file보다 한 단계 큰 크기의 ProFile을 사용하여 근관을 재형성한 후 NaOCI로 세척하였다. 근관충전 후 전기화학적 방법으로 24일 동안 치근단 누출을 측정, 비교하였다. 본 연구의 결과 수산화 칼슘 제거를 위한 두가지 방법은 근관충전후 치근단 미세누출에 있어서 차이가 없음을 알 수 있었다. This study evaluated the effect of two different calcium hydroxide (Ca(OH)_(2)) paste removal techniques on the apical leakage of canals obturated with gutta percha cones and sealer after removing a Ca(OH)_(2) dressing using an electrochemical method. Seventy extracted single-rooted teeth were instrumented on with Profile rotary files under NaOCI irrigation. Fifty-eight canals were filled with calcium hydroxide paste, which was then removed using one of the following two techniques. In group A, calcium hydroxide was removed using only NaOCI irrigation, and in group B, the canals were re-prepared with a Profile rotary files-one size larger than the previous instrument and were irrigated with NaOCI. In both groups, the root surfaces were coated twice with nail varnish from CEJ to an area 4㎜ away from the apex after canal obturation. Apical leakage was measured using an electrochemical method for 24 days. All the specimens showed leakddffqage that increased markedly in the first three days. There was no significant difference between the two groups (p > 0.05). The effect of two calcium hydroxide paste removal techniques on the apical leakage was not different during a short period.

유니사이클 로봇에 대한 인간적 추론 제어 메카니즘

김중완,안찬우,전태옥,전언찬,정희균 동아대학교 공과대학부설 생산기술연구소 1996 生産技術硏究所硏究論文集 Vol.1 No.2

Our unicycle has simple mechanical structure.But unicycle's dynamical system is a very sensitive unstable nonlinear system. equations of motion for a simple unicycle robot were derived using Lagrage's method. In this paper, a human fuzzy influence control mechanism was established throught an inquiry into human riding a unicycle, and we developed a hybrid controller to control our unicycle robot. This proposed hybrid controller is consisted with a pure PD and two fuzzy gain scheduled controllers and a direct fuzzy logic controller. Computer simulation results show that our hybrid controller has robust control performnance to unstable nnonlinear unicycle robot system.

'매혹'으로써 영화 보기를 위한 제안

전찬일 충남대학교 인문과학연구소 2007 인문학연구 Vol.34 No.2

This study aims to raise some questions towards the blindness or one-sidedness connected with 'reading a film' which this writer has experienced for the past 14 years or so as a film critic, since he started 'studying cinema' almost 25 years ago. As a matter of fact, 'Reading a Film' is just one way of watching and enjoying a filmic text more interestingly and meaningfully. In reality, however, the situation is not always such that. The purpose and the reason that we should read a film are forgotten and the case happens very often that reading a film becomes the very purpose of watching it, especially among the film experts, to his regret. He never wants to insist on the uselessness of reading a film at all. For it can be the useful, probably best way to watch a film more affluently, that is to say 'more pleasantly'. The problem is not reading a film in itself, but reading it 'blindly'. In order to get at the purpose of this study, this writer will bring and use the concept and term 'attraction/s', originated from the 'montage of attractions' of the great Russian film-maker and film & theatre theoretician, Sergei M. Eisenstein. According to Eisenstein, “An attraction (in our diagnosis of theatre) is any aggressive moment in theatre, i.e. any element of it that subjects the audience to emotional or psychological influence, verified by experience and mathematically calculated to produce specific emotional shocks in the spectator in their proper order within the whole.(...) I regard the attraction as being in normal conditions an independent and primary element in structuring the show, a molecular (i.e. compound) unity of the effectiveness of theatre and of theatre as a -whole.” Of course the definition of attraction from Eisenstein's 'montage of attractions' is true of cinema almost exactly, too. Therefore, we can say that an attraction in cinema is every cinematic element that subjects the audience to emotional or psychological influence, in other words attracts the audience at any strength and degree by any cinematic visual or/and sound or/and narrative etc.. As an example of watching a film with the 'attraction', this writer focuses on one of the most anticipated but flopped films in the year 2005, <Duelist> directed by Myoung-Se Lee. By means of attraction, <Duelist> may be really 'something new & different' among the many so-so Korean popular movies, contrary to the lots of negative opinions towards the attractive movie. In writing this article, this writer keeps in mind as the main readers his former students who wanted to go deep inside the film world more or so. In that respect, this article is a humble proposal for the beginners who wants to study 'cinema in general'.

이산화티타늄계 광촉매를 이용한 벤젠의 처리 특성

전의찬,송민종,김전희 동신대학교 환경연구소 1999 환경연구 Vol.4 No.1

An available methods for abating VOC(including Benzene) are thermal or catalytic incineration, liquid absorption, solid adsorption, condensing, membranes, biodegradation and plasma discharge, but a number of defects are these VOC abating methods, including ; requires a auxiliary fuel, generate secondary pollutants(waste catalysts, waste absorbents, waste adsorbents, ozone, etc.), a large scale, etc.. But photoactive catalysts, when illuminated with UV-light, generate highly reactive radicals that can oxidize the organic contaminants in gas. One methods to increase the efficiency of the process, and thereby reduce the light energy requirement, is by developing more active catalysts. Because of, ball type TiO₂ catalyst were obtained commercially and/or prepared in laboratory were examined for their photoacivity, and they are TiO₂ added some annex(Al₂O₃, SiO₂, KsO, P₂O_(5), etc.). The organic compounds used to identify the best photo catalysis condition were benzene. This study also examined the impact of catalyst structure, light intensity, existence of oxygen as an electron acceptor and Benzene initial concentration on the reaction kinetics. Labratory experiments were performed to investigate TiO₂ photo catalysis for treating test gas contaminated with Benzene. and TiO₂ photo catalysis efficiency for mineralization of Benzene is also evaluated. The photo oxidation of Benzene was carried out in a photo catalytic reactor at room temperature. I performed BTX photo catalytic oxidation experiments using a single-pass annular reactor. The organic-contaminated gas was prepared in Teflon sampling bag(25L) and passing through photo catalytic reactor by vacuum pump which is located reactor outlet. The BTX diluted with mixture air or nitrogen gas. Flow rates for test gas stream were controlled by micro flow meter going out the reactor. The reactor illuminated with 15W near-UV lamp, BLB lamp or Fluorescent lamp. The light intensity at the catalyst surface were estimated to be 0.8 to 6mW cm-2s-1. The inner cell of the reactor was packed with ball type titanium dioxide(Ø 6mm). Benzene was determined by GC-FID of gas samples taken from the a glass sampling bulb which was located at reactor outlet by gas-tight syringe. TiO₂ photo catalysis for treating test gas contaminated with Benzene. and TiO₂ photo catalysis efficiency for mineralization of Benzene is also evaluated. Using the anatase type photo catalyst, Benzene conversion rate is greater than that of rutile(92% conversion of 100ppmv Benzene using anatase type photo catalyst, 80% conversion of 100ppmv Benzene using rutile type photo catalyst at 0.5L/min) Effect of light intensity on the rate of Benzene photo catalytic decomposition was investigated by three type lamps within the reactor. When light intensity to increase, the Benzene conversion rate to increase. Using the BLB lamp showed higher activity than the Fluorescent lamp, but UV lamp showed the hight photo catalytic activity(26% conversion of 100ppmv Benzene with Fluorescent lamp, 63.5% conversion of 100ppmv Benzene with BLB lamp, 92% conversion of 100ppmv Benzene with UV lamp at 0.5L/min). Experiments with added oxygen as an electron acceptor improved the reaction rate considerably(92% conversion of 100ppmv Benzene without oxygen, 66.1% conversion of same Benzene concentration with mixture air at 0.5L/min). The Benzene conversion rate begins to decrease while Benzene initial concentration begins to increase. We have thus concentrated our effects on the study of Benzene degradation kinetics in vary initial Benzene concentration.

흉선종 제거후에 발생한 재생 불량성 빈혈 : 증례보고

전원선,이상철,김현정,배상병,김찬규,이남수,박노진,이규택,박성규,홍대식,박희숙,원종호 순천향의학연구소 2007 Journal of Soonchunhyang Medical Science Vol.13 No.2

Thymoma is associated with myasthenia gravis, Pure red cell aplasia, and autoimmune diseases such as autoimmune hemolytic anemia, aplastic anemia, and hypogammaglobulinemia. It's association with aplastic anemia is rare and aplastic anemia appearing after surgical removal of thymoma is especially rare. The authors hereby report a case of aplastic anemia occuring in a patient who was diagnosed with thymoma and myasthenia gravis and had the tumor surgically removed. The patient was treated with anti-thymocyte globulin, cyclosporin, and prednisolone, and showed partial remission with hematologic improvements after 12 months.

QT연장 증후군 환자에서 Head-Up Tilt Test에 의해 유발된 Torsades De Pointes 1례

전익수,차태준,김길수,김동완,김규종,김찬욱,김성만,주승재,이재우 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.8

환경기초시설 중 하·폐수처리과정으로부터의 GHG 배출량 예측 : 광주·전남지역을 중심으로 Kwang ju·Chollanado

전의찬,김전희,송민종 동신대학교 환경연구소 2000 환경연구 Vol.5 No.1

본 연구는 환경기초시설 중에서 생활하수와 산업폐수 처리장에서 발생하는 특히 광주·전남 지역을 중심으로 온실가스의 배출량과 장래 저감 잠재성을 평가하고, 기후변화협약을 대비한 국가 Inventory의 기초자료로 이용될 수 있도록 하였으며, 결론적으로 하ㆍ폐수부문에서 온실가스 배출 잠재성을 감소시키기 위한 방안으로 먼저 하수 및 폐수의 체계적인 수집이 이루어져야 하며, 수집된 하ㆍ폐수는 반드시 적절한 처리과정을 통하여 수계에 배출되어져야 한다. 또한 적절한 처리과정 중에 배출되는 온실기체의 대기 중으로의 누설을 억제하고 회수율을 높이는 관리대책이 수립되어야 하며, 회수율을 높이는 대책은 하ㆍ폐수부문에서 온실가스 배출 잠재력에 대한 저감율에 대하여 좀더 효율적임을 알 수 있다. 또한 상기와 같은 저감방법 외에도 하ㆍ폐수부문에서의 온실가스 저감잠재력을 위하여 정부는 온실가스 배출량을 계산하는데 필요한 여러 가지 자료를 확보하고, 좀더 신뢰할 수 있는 온실가스 배출량을 산출하며, 이들 자료를 토대로 정부는 하ㆍ폐수부문에서의 온실가스 저감잠재력을 위하여 연차적으로 관리대책을 설정해야 한다. 그리고 이에 대한 검중체계를 마련하여 전ㆍ후 효과분석을 해야 할 것이다. This study evaluated greenhouse gas(GHG) emissions and future reduction potential emitted from domestic and industrial wastewater treatment system in Kwangju city and Chollanamdo. For decreasing of GHG emissions potential, systematic collection method of domestic and industrial wastewate is established and collected domestic and industrial wastewater is treated reasonal wastewater treatment process. GHG which is leak from wastewater treatment process to air was controled, Control policy which are increasing recovery ratio was established. In addition to decreasing method, Government make sure of variable data fro estimating GHG emissions quality and evaluated GHG emissions quality reliable method.

탱커운임지수 예측을 위한 VARMAX 모형의 설정

전찬영 한국해운학회 1999 해운물류연구 Vol.28 No.-

Vector Autoregressive(VAR) model can be usefully applied to various kinds of multiple macroeconomic time series data due to its ability to analyze many variables simultaneously. In VAR model, it's possible to know the response of one variable to an impulse of another variable and the proportion of forecast error variance of one accounted by others. Thus, one would like to investigate the relationship between two variables in a higher dimensional system. Nevertheless, there are many previous questions to be solved in utilizing the dynamic properties of VAR process. Amongst them, overparameterization and absence of proper estimation method are the key problems to limit the widespread use of the model. In this paper, for forecast of tanker freight rates VARMAX model will be established to overcome the overparameterization and Hannan and Rissanen's 3-step estimation method (HR method), which has been applied to ARMAX modeling, will be generalized in order to obtain the efficient estimate for the parameters of VARMAX model.