상아질에 적용된 재 습윤제가 미세인장 결합강도에 미치는 영향

강희영,조영곤,김종욱,박병철,유상훈,진철희,최희영,기영재 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.2

This study investigated that the effect of rewetting agent on dentinal microtensile bond strength (μTBS). Human molars were sectioned to expose the superficial dentin surfaces. Samples were divided into two groups according to type of adhesives-Single Bond (S) and One-Step (0)], and again subdivided into five groups by different dentin surface treatment-dry for 15s (D) , blot dry (BD) or dry for 15s, and rewet with different rewetting agents[distil1ed water (DW), Gluma Desensitizer (GD) and Aqua-Prep (AP)]for 30s. After application of adhesive, composite resin was built up on the bonding surface. Each tooth was sectioned to obtain stick with 1mm^(2) cross sectional area and the μTBS was determined by EZ test. In the S group, the mean μTBS of GD, AP and BD group was significantly higher than that of DW and D group (p < 0.05). In the 0 group, the mean μTBS of AP, GD, BD and DW group was significantly higher than that of D group (p < 0.05). The data suggested that Gluma Desensitizer and Aqua-Prep could be successfully used as rewetting agents, and Distilled water could be acceptable in aceton based adhesive system only.

정신분열병에 대한 리스페리돈의 효과 및 안정성

이민수,김용구,김영훈,연병길,오병훈,윤도준,윤진상,이철,정희연,강병조,김광수,김동언,김명정,김상훈,김희철,나철,노승호,민경준,박기창,박두병,백기청,백인호,손봉기,손진욱,양병환,양창국,우행원,이정호,이종범,이홍식,임기영,전태연,정영조,정영철,정인과,정인원,지익성,채정호,한상익,한선호,한진희,서광윤 大韓神經精神醫學會 1998 신경정신의학 Vol.37 No.1

연구목적 : 본 시험의 목적은 임상시험 시작전에 연구자들을 대상으로 PANSS Workshop을 통하여 PANSS, ESRS에 대한 국내에서의 표준화 작업을 구축하고 새로운 정신병 치료제인 리스페리돈의 효과와 안정성을 재확인하여 리스페리돈 사용에 대한 적정화를 이루는데 있다. 연구방법 : 1996년 4월부터 1996년 9월까지 국내 39개 대학병원 정신과에 입원중인 혹은 증상이 악화되어 입원하는 정신분열병 환자 377명을 대상으로 다시설 개방 연구를 시행하였다. 1주일간의 약물 배설기간을 가진후, 리스페리돈을 8주간 투여하였고, 기준점, 1주, 2주, 4주, 그리고 8주후에 평가되었다. 용량은 제1일에는 리스페리돈 1mg씩 1일 2회, 제2일에는 2mg씩 1일 2회, 제3∼7일에는 3mg씩 1일 2회 투여하였다. 이후 환자의 임상상태에 따라 임의로 증량할 수 있으며, 최대 일일 16mg을 초과하지 않도록 하였다. 추체외로 증상을 조절하기 위한 투약을 허용하였다. 임상증상 및 부작용의 평가는 PANSS(Positive and Negative Syndrome Scale), CGI(Clinical Global Impression) 그리고 ESRS(Extrapyramidal Symptom Rating Scale)을 사용하였다. 연구결과 : 377명중 343명(91%)이 8주간의 연구를 완결하였다. 치료 종결시점인 8주후 PANSS 총점수가 20% 이상 호전된 경우를 약물 반응군으로 정의할때, 약물반응군은 81.3%였다. 리스페리돈에 반응하는 예측인자로는 발병연령, 이전의 입원 횟수, 유병기간이 관련 있었다. 리스페리돈은 1주후부터 PANSS양성, 음성, 및 일반정신병리 점수상에 유의한 호전을 보여 효과가 빨랐다. CGI의 경우도 기준점에 비해 1주후부터 유의한 감소를 나타내었다. ESRS의 경우, 파킨슨 평가점수는 기준점과 비교해 투여 1주, 2주, 4주후 유의하게 증가되었다가 8주후 기준점과 차이가 없었다. Dystonia 평가점수는 1주후만 유의한 증가를 보였으며, dyskinesia 평가점수는 유의한 차이가 없었다. 혈압, 맥박수의 생명징후 및 일반 혈액학 검사, 생화학적 검사, 심전도 검사에서 유의한 변화는 없었다. 결 론 : 이상의 다시설 개방 임상 연구를 통해 리스페리돈은 정신분열병 환자에서 양성증상뿐만 아니라 음성증상 및 전반적인 증상에도 효과적인 것으로 사료된다. 보다 명확한 평가를 위해서는 다른 항정신병약물과의 이중맹검 연구가 필요할 것으로 생각되며, 또한 장기적 치료에 대한 평가도 함께 이루어져야 하겠다. Objective : The purpose of this study was to investigate the efficacy and safety of risperidone in the treatment of Korean schizophrenic patients. Method : This multicenter open study included 377 schizophrenic patients drawn from 39 university hospitals. After a wash-out period of 1 week, the schizophrenic patients were treated with risperidone for 8 weeks and evaluated at 5 points ; at baseline, and 1, 2, 4 and 8 weeks of treatment. The dose was increased from 2mg/day(1mg twice daily) to 6mg/day(3mg twice daily) during the first week and adjusted to a maximum of 16mg/day over the next 7 weeks according to the patient's clinical response. Medication to control extrapyramidal symptoms was permitted. The psychiatric and neurological status of the patients was assessed by PANSS, CGI, and ESRS scales. Results : 343(91%) of 377 patients completed the 8-week trial period. Clinical improvement, as defined by a 20% or more reduction in total PANSS score at end point, was shown by 81.3% of patients. The predictors of response to risperidone were associated older age, shorter duration of illness, fewer previous hospitalization. Risperidone had rapid onset of action ; a significant decrease of the total PANSS and three PANSS factor(positive, negative, general), and CGI was already noticed at the end of first week. For the ESRS, parkinsonism rating scores were significantly increased until week 4 comparing with baseline. Dystonia rating scores were significantly increased until week 1, and dyskinesia rating scores were not significantly changed during the study. Laboratory parameters including vital sign, EKG, hematological, and biochemical values showed no significant changes during the trial. Conclusions : This study suggests that risperidone is generally safe and effective against both the positive and negative symptoms in our group of patients.

하악골 골절에 대한 임상통계학적 연구

이성훈,김기영,조규승,소광섭,박홍주,조요기,오희균,유선열 大韓顎顔面成形再建外科學會 1998 Maxillofacial Plastic Reconstructive Surgery Vol.20 No.1

IgG GM₁ 항체와 Campylobacter jejuni 항체와 관련된 급성 운동축삭형 신경병증

홍경훈,김승현,이영배,이영주,김희태,김주한,김명호 대한신경과학회 1997 대한신경과학회지 Vol.15 No.5

선천성 수근관 증후군 1례 보고

이규훈,황치문,김민석,김희상,안경회 大韓再活醫學會 1998 Annals of Rehabilitation Medicine Vol.22 No.3

Power analysis attack 방어대책에 대한 연구

이훈재,최희봉,박일환 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(B)

Attacks have been proposed that use side information as timing measurements, power consumption, electromagnetic emissions and faulty hardware. Elimination side-channel information or prevention it from being used to attack a secure system is an active ares of research. In this paper, differential power analysis techniques used to attack DES are reviewed and analyzed. Finally, we propose the prevention of DPA attack.

임베디드 자바가상기계를 위한 클래스 ROMizer 설계 및 구현

지정훈,양희재 경성대학교 공학기술연구소 2004 공학기술연구지 Vol.11 No.-

Class file contains all necessary information required to run a Java program for Java virtual machine. However, it is found that the structure of Java class file is not as efficient in respect of both size and accessibility. Because embedded systems usually have low-performance processors and small amount of memory, it is not a good idea to store and access class files directly on embedded Java system in storage and performance viewpoint. In this paper, we present a design and implementation of the class ROMizer, a tool that allows Java class files to be pre-loaded in preparation for placing them into the ROM memory of an embedded Java application. The ROMizer produces a single binary image file from a multiple set of Java class files. The binary image file is more effient than class file in repect of both size and accessibility. The basic architecture of the ROMizer is presented and the performance and accessibility of the designed binary image file is analyzed in this paper.

유한 차분 시간영역법을 이용한 GPS수신 안테나의 설계 해석

진태훈,최희주,변건식 東亞大學校 附設 情報通信硏究所 1998 情報通信硏究所論文誌 Vol.6 No.1

In this paper, a microstrip antenna is designed using a rectangular patech. To find characteristics of the antenna, computer simulations of teh rectangular single microstrip patch antenna are performed with changing width adn length. Through the results of simulation, we found that the 3-D FDTD method is an effective method for designing microstrip patch antenna. According to simulation the resonant point has been found it in the frequency received from GPS satellite. It is thought that make it match by adjusting the feed point.

기업의 국제간 전략적 제휴 유형결정요인에 관한 연구

조희영,구필훈 동국대학교 경제경영연구원 1998 經濟經營硏究 Vol.22 No.1

Observers of the corporate landscape are witnessing an increase in the variety and complexity of organization forms, many of which represent strategic alliances between organizations. for example. joint ventures, license agreements, research and development(R&D) partnerships. and so forth. These alliances result from strategic and operating moves by firms that have adapted to emerging opportunities as well as those that are repositioning themselves within existing industrial frameworks. This study is concerned with the mode decision of strategic alliance. Specifically, it is my contention that beyond the environmental, transaction-specific and firm-specific factors well established in the literature to affect the mode decision of strategic alliance. The purposes of this study are as follows; First, to arrange the various concepts of strategic alliance through literature review. Second, to examine the major factors related to mode of strategic alliance. Third, to analyze the determinants to affect the mode decision of straegic alliance. Fourth, to test the relation between alliance mode and performance. To test the hypothese, 75 Korean companies jointly allianced with foreign companies were surveyed. To test the hypotheses, reliability test, discriminant analysis and analysis of variance are used. The results of this study are as follows; First, in the relation of the firm-specific variable and alliance mode, strategic importance in parent's portfolio gives effect to the choice of alliance mode. Second, in the relation of the environmental variable and alliance mode, country risk, location unfamiliarity, demand uncertainty and intensity of competition give effect to the choice of alliance mode. Third, in the relation of the transaction-specific variable and alliance mode, opportunism give effect to the choice of alliance mode. Fourth, in the relation of the alliance mode and performance, reciprocally interdependent gives positive effect to satisfaction In conclusion, strategic importance in parent's portfolio, country risk, location unfamiliarity. demand uncertainty and intensity of competition and opportunism are found to affect the mode decision of strategic alliance on Korean firms.

간세포 배양기술을 이용한 생인공간 개발 현황

이두훈,윤희훈,박정극 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.2

우리 인체의 장기 중 간(liver)은 생존에 그 어느 장기보다도 중요한 역할을 담당하는 장기로서 여러 가지 원인으로 인하여 갑자기 간의 기능이 상실된 환자에게는 간이식만이 유일한 대안이다. 간세포를 이용한 체외 순환형 간 보조 장치(생인공간, bioartificial liver)는 최근 유일하게 전격성 간부적 환자의 생존을 중대 효과가 검증되었고 간이식이나 환자 자신의 간 재생으로의 생명 연장 교량 역할을 효과적으로 수행할 수 있을 것으로 기대되고 있다. 본 논문에서는 생인공간의 개념과 임상시험 중인 대표적인 생인공간 시스템 현황에 대해서 공학적 관점 위주로 소개하고 향후 이 분야에 대한 연구전망에 대하여 서술하였다. The liver is mutifunctional vital organ for healthy survival and orthotopic liver transplantation is the only definitive therapy for patients with acute or fulminant hepatic failure(FHF) so far. Bioartificial liver, a hepatocyte-based extracorporeal liver support system, enhanced the survival rates of patients with FHF and expected to act as a bridge to provide the extension of survival time until a donor organ becomes available for transplantation or their own liver can be regenerated. In this paper, we introduce concepts of bioartificial liver and review representative bioartifical liver systems in clinical trials with engineering issue. Finally we describe future perspectives of bioartificial liver.