용매-물-1-프로판올계의 액-액 평형

박동원,정상훈,신현심,서진기,이진우 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1

Due to the rising cost of energy, new separation processes based on extraction are becoming more attractive than before. Thus, the need for calculating and predicting liquid-liquid equilibria(LLE) compositions has very much increased. The purpose of this study is to determine the binodal curves, tie lines, plait points and selectivity for the temary systems of 1-propanol-water with toluene, ethyl-acetate, 1-butanol, n-hexane and amyl alcohol as solvent and also for the quarternary solvent-NaCl salt solution-1-propanol systems at 25℃.

이탈리안 라이그래스의 성숙종자 유래 캘러스로부터 효율적인 식물체 재분화

우현숙,이상훈,이동기,김진수,원성혜,이병현 Plant molecular biology and biotechnology research 2004 Plant molecular biology and biotechnology research Vol.2004 No.-

As an initial step for future genetic manipulations to improve forage characteristics of Italian ryegrass (Lolium multiflorum Lam.), an efficient tissue culture system was established and the factors affecting plant regeneration were evaluated. MS medium containing 5 ㎎/L 2,4-D was optimal for embryogenic callus induction from mature seed and had a strong effect on successive plant regeneration. The plant regeneration frequency was observed at above 70% when embryogenic calli induced were transferred to N6 medium supplemented with 1 ㎎/L 2,4-D and 5 ㎎/L BA. Among several basic media tested, MS and M6 medium were optimal for callus induction and plant regeneration, respectively. Genotype was an important factor in plant regenerability. 'Jeanne' showed the highest regeneration frequency of 73%. A short tissue culture period and high-frequency regeneration system established in this study will be useful for molecular breeding of Italian ryegrass through genetic transformation.

상악 제1대구치 근심협측 치근의 근관계에 관한 연구

조동현,최호영,박상혁,최기운 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.3

This study is to investigate the canal system in the mesiobuccal root of the maxillry first molar. 61 maxillary first molars were randomly selected. Serial transverse sections were made perpendicular to the long axis of the mesiobuccal root. Each section was placed in 3% sodium hypochlorite for 24 hours and rinsed in water and dried. The resected surface was stained with 2% methylene blue dye and examined with stereomicroscope. 1. Canal configuration analysis showed that 36.1% of the specimen classified as type Ⅰ, 16.4% as type Ⅱ, 37.7% as type Ⅲ and 9.8% as type Ⅳ. 2. Type Ⅱ canal was merged in one canal within 1 to 4mm of the apex. 40% of type Ⅱ cnal coverged at 2mm of the apex. 3. Type Ⅳ canal was divided into two canal within 2 to 4mm of the apex. 66.6% of type Ⅳ canal branched off at 2mm of the apex. 4. None of the sections had more than two main root canal. 5. 48.4% of the sections in 3mm with two canals contained an isthmusand more than 70% with two canals has isthmus at 4 to 5mm sections. 63.9% of the mesiobuccal root of maxillary first molar had two canaland 76.% of sections with two canals in 5MM had an isthmus. Because of this complexity the clinician should always search for extra canal carefullyand root canal system, including an isthmus, should be cleaned and shaped completelyand obturated three dimensionally for successful endodontic treatment.

비등방성 확산 필터와 형태학적 처리를 이용한 역하프토닝

고기영,주동현,염동훈,김두영 동아대학교 정보기술연구소 2001 情報通信硏究所論文誌 Vol.8 No.2

Digital Halftoning convert a continuous-tone images to a binary images. Inverse halftoning addresses the problem of recovering a continuous image from a halftoned binary image. Simple low pass filtering can remove the high frequency noise but it also removes the edge information. Thus the edge information should be separated from the halftoning noise. As a result, the edge of result image is blurring. This paper present that we obtain continuous-tone-image which using Anisotropic diffusion filter. To reduce noise without blurring the edges of reconstructed image use edge map. The experimental result show that proposed method gives a higher PSNR and better subjective quality than conventional methods. As a result, the edge information of reconstructed image reduce blurring.

정신과 입원 환자에서 난폭 행동 예측 인자에 관한 연구

김기현,이성동,최용성 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.6

연구목적: 정신과 입원 환자에서 난폭 행동의 발생을 예측하는데 있어 초기 치료동맹과 정신병리의 유용성을 전향적인 연구 방법을 통해 평가함으로써 정신과 입원 환자의 난폭 행동을 예방하는데 기여하고자 하였다. 방 법: 1998년 1월 1일부터 1998년 11월 30일까지 성안드레아 정신병원에 입원한 환자(알코올 의존 및 행동 장애 환자는 배제함) 중에서 105명을 연구 대상으로 선택하였다. 입원 후 5일 이내에 대상 환자의 난폭 행동의 과거력, 초기 치료동맹 및 정신병리를 평가하였으며, 입원 기간 초기 2주 동안에 난폭 행동의 발생 여부를 추적 조사하였다. 난폭군(38명)과 비난폭군(67명)을 비교하여 사회 인구학적 변인, 난폭 행동의 과거력, 초기 치료동맹, 정신병리 등이 정신과 입원 환자의 난폭 행동을 예측하는데 유용한지를 평가하였다. 결 과: 1) 난폭 행동의 과거력이 있는 환자에서 입원 후 난폭 행동의 발생 빈도가 유의미하게 높았다. 2) 입원 후 초기 치료동맹이 약한 경우에는 입원 초기에 난폭 행동이 유의미하게 많이 나타 났다. 3) BPRS의 하위 척도 중에서 BPRS-철퇴-지체(withdrawal-retardation)의 점수가 낮고, BPRS-초조-흥분(agitation-excitement)과 BPRS-적개심-의심(hostile-suspicious)의 점수가 높을 수록 난폭 행동의 발생 빈도가 높았다. 4) 변인들을 통제하는 다중로짓분석 결과, 입원 전 난폭 행동의 과거력, 초기 치료동맹, BPRS-초조-흥분(agitation-excitement) 척도의 점수 등이 정신과 입원 환자에서 난폭 행동의 발생을 예측하는 인자로서 의미가 있었다. 결 론: 특정 정신병리와 초기 치료동맹이 입원 초기에 정신과 입원 환자의 난폭 행동을 예측하는데 유용하다고 생각된다. Objectives: The goal of this study was to predict the factors related to psychiatric inpatients` violence in a mental hospital. This was follow-up study to assess the psychopathology of patients and the quality of the initial therapeutic alliance between the patient and the therapist, as a predictor of the risk of violent behavior. Methods: The subjects were 105 psychiatric inpatients admitted to St. Andrews` Neuropsychiatric Hospital from January 1998 to November 1998, but alcohol dependent patients and conduct disorder patients were excluded. Within the first five hospital days, we rated past history of violence, patients` psychopathology using Brief Psychiatric Rating Scale and quality of initial therapeutic alliance. We also evaluated violent behaviors using Overt Aggression Scales during the two weeks before admission and during the two weeks of hospital stay and compared the 67 non-violent ingatients with 38 violent ingatients on the utility of socio-demographics variables, past history of violence, utility of the initial therapeutic alliance and psychopathology in evaluating the risk of violent behaviors. Multiple logistic analysis was conducted to analyze risk factors for violent behaviors. Results: 1) The violent inpatients significantly were more closely related with the previous history of violent behavior. 2) The weaker the initial therapeutic alliance were, the significantly higher violent behavior exhibited. 3) Violent behavior was related significantly with higher BPRS-agitation-excitement factor score and higher BPRS-hostile-suspicious factor score. Violent behavior also was related with lower BPRS-withdrawal-retardation factor score. 4) According to the multiple logistic analysis, the predictors of violent behavior were past history of violence and initial therapeutic alliance and BPRS-agitation-excitement factor. Conclusions: The results suggest that initial therapeutic alliance and the specific psychopathology ane useful in evaluating patients` risk for violence.

광섬유 방사선 센서와 EBT 필름을 이용한 심부선량 백분율 측정 및 비교

조동현,장경원,유욱재,신상훈,이봉수,문주현,박병기 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-

In this study, fiber-optic sensor is fabricated to measure PDD of CLINAC. As a scintillating light generated by a high energy X-ray from the medical LINAC is measured using photo diode amp system, It is expected that a high-resolution, real-time fiber-optic dosimeter for medical LINAC can be developed.

GHA 기반의 홍채 인식 시스템에 관한 연구

주동현,염동훈,고기영,박용기,김두영 동아대학교 정보기술연구소 2001 情報通信硏究所論文誌 Vol.9 No.1

본 논문은 Biometrics분야 중 다른 생체학적 특징보다도 정확도면에서 가장 뛰어난 특징인 안구의 홍채 패턴을 이용하여 사용자를 인증 하는 시스템에 관한 연구이다. 입력된 안구 영상으로부터 전처리 과정을 거쳐 극좌표 변환을 통해 홍채 패턴을 추출한 후 웨이블릿 변환을 이용하여 특징패턴을 압축하였으며, PCA(Principal Component Analysis:주성분 해석)의 한 종류인 GHA(Generalized Hebbian Algorithm)를 사용하여 등록된 사용자의 패턴 DB에서 Basis 배열을 추출하고, 구축된 Basis 배열과 입력 영상 패턴과의 비교 Matching을 통하여 사용자를 인증하는 시스템을 제안한다.

방사선사진의 인덱스-순서 분석을 통한 치아경조직의 탈염화 검출

박동현,박영호,김경숙,박정훈,이기자,최삼진,최용석,황의환,박헌국 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.2

Purpose : The purpose of this study was to develop the radiographic technique for detecting the demineralization which is known as indication of dental caries. Materials and Methods : This technique was based on the comparing of multiple radiographs which was irradiated by multiple X-ray spectra. For the meaningful comparing, the multiple radiographs were reconstructed to the dosimetrically consistent images using a standard material. The difference of resulting images of same target with multiple spectra represents the difference of response of material as regards the spectra. Results : We have found about 10% of demineralization of dental hard tissues particularly in the proximal region through the analyzing of differences. Conclusion : Most intriguing thing in this investigation was that the method to analyze difference shows us to an anatomic structure of dental hard tissues even if absolute values of optical density were excluded during the procedures.

중년남성의 배드민턴 참가가 신체조성 및 호흡 순환기능에 미치는 영향

김동현,민춘기,권영옥 충남대학교 체육과학연구소 2006 體育科學硏究誌 Vol.24 No.1

The purpose of this study was to examine the effects of eight week of badminton training on body composition and cardiorespiratory function in mid-aged men. Study participants consisted of 10 overweight men who have played the badminton no longer than 3 months and 10 overweight men who have not worked out at all. Body composition and cardiorespiratory function changes were assessed via badminton training in 5 days a week for 8 weeks. The data were examined using the paired t-test and subjected to an analysis of variance (ANOVA). The results indicated the reduction in body weight, body fat, and fat distribution compared to controlled group while that of fat-free mass was insignificant. There also was a significant increase in VO₂max, ventilation rate, respiratory exchange ratio, and exercise continuous time. Therefore, regular training in badminton can be effective at body composition and cardiorespiratory function and this initial finding can provide positive effects on prevention of an adult disease.

천궁의 GABAА-Benzodiazepine 수용체 복합체와의 상호작용

강지현,이동웅,하정희 대한생물치료정신의학회 1997 생물치료정신의학 Vol.3 No.2

요약천궁(Cnidium Officinale)는 미나리과 다년생초본식물로서 대뇌 억제 및 진정 작용이 있다는 여러 문헌 등을 참고하여 볼 때 천궁은 항불안작용을 나타낼 가능성이 시사되었다. 이에 본 연구는 천궁을 사용하여 실험 동물에서 천궁의 항불안 작용을 검색하고 그 작용기전의 일부를 밝히고자 천궁을 극성 및 비극성 용매로 추출하여 분획을 만들고 이들 분획의 GABA-benzodiazepine 수용체 복합체 결합반응에 미치는 영향을 관찰하고자 하였다. 실험 결과 천궁 표준추출물 경구투여는 생쥐의 elevated plus maze 검사에서 그 효과는 diazepam 1 mg/kg 투여 후 실시한 elevated plus maze 검사 결과보다 낮았으나, 개방통로에로의 진입회수 및 개방통로에서의 체류시간을 증가시킴으로써 불안해소작용을 나타내었다. 또 천궁의 표준추출물은 benzodiazepine 수용체 길항제인 [3H]Ro15-1788 결합을 억제함으로써 수용체 활성물질의 존재 가능성이 관찰되었다. 이러한 행동검사상의 불안해소작용 및 benzodiazepine 수용체 활성도를 나타내는 구성성분을 추적하고자 천궁의 표준추출물의 분획화를 실시하였는데, 이를 통하여 얻은 각 분획들을 사용하여 수용체 활성도를 검색한 결과, 모든 분획에서 활성도를 나타내었으나 그 중 chloroform분획의 활성도가 crude한 추출물인 methanol 추출물이나 다른분획에 비하여 가장 높은 활성도를 나타냄을 관찰하였다.천궁의 chloroform분획은 [3H]flunitrazepam의 흰쥐대뇌피질조직에 있는 benzodiazepine 수용체에 대한 결합반응을 억제시켰으며, 이러한 억제도는 GABA 및 chloride 존재에 의해 더욱 항진되는 positive GABA shift 현상이 관찰되었다. 이상의 결과를 종합해볼 때, 천궁의 chloroform분획내에는 benzodiazepine 수용체에 대해 효현제 활성을 지니는 물질이 있음을 추측할 수 있으며, 이는 천궁의 항불안작용의 중요한 한 기전으로 생각된다. C. Officinale is a medicinal plant which has been known to have anxiolytic and sedative activity. A survey of the relevant literature has indicated that the putative anxiolytic activity of C. Officinale has not been scientifically investigated. Therefore, the present study was designed to assess anxiolytic property and interaction with benzodiazepine receptor of C. Officinale. The putative anxiolytic activity of methanol extract of C. Officinale was performed in mice using an elevated plus maze paradigm. Chronic oral administration of C. Officinale showed anxiolytic action in mice. The interaction of C. Officinale with benzodiazepine receptor was investigated using rat cortices. Methanol extract of C. Officinale inhibited the binding of [3H] Ro 15-1788, a selective benzodiazepine receptor antagonist to benzodiazepine receptor of rat cortices. Chlorform fraction of methanol extract showed higher binding activity to benzodiazepine receptor than crude extract by methanol. GABA significantly enhanced the potency of C. Officinale in inhibiting [3H] flunitrazepam, a selective benzodiazepine receptor agonist, binding to benzodiazepine receptor. From these findings, it can be concluded that substance or substances with neurochemical properties characteristic of a benzodiazepine receptor agonist may contribute to the anxiolytic property of C. Officinale.