Polygoum Tinctoria와 합성 인디고 염료의 물리화학적 특성 비교

최창용,장미경,공병기,최혜영,나상권,이동병,양숙향,나재운 한국공업화학회 2002 응용화학 Vol.6 No.2

The natural dye substances appear to have a lot of benefits that enable the dyed materials to exhibit their natural colors. It may have a bit of a harmful influence on the human body itself, in comparison with the synthetic substances. It also causes hardly any environmental pollution because of the natural chemicals and costs much less to disposal. In this study was investigated physicochemical characterization of polygoum tinctoria dye substance and synthetic indigo. Calcium hydroxide was added into polygoum tinctoria leaves to precipitate dye substances and it was freezing dried into powder form. Characterizations of dye substances were investigated by UV/VIS spectrophotometer, TLC, DSC, TGA, HPLC, and MALDI-TOF Mass. Resultantly, polygoum tinctoria was confirmed that is consisted of two ingredients from these results.

근치적 위절제술을 시행한 위암 환자에서 보조요법으로서 5-Fluorouracil, Epirubicin과 5-Epirubicil,Cisplatin의 복합화학요법의 효과 비교

최정혜,안명주,한동수,손주현,전용철,박훤겸,백홍규,이홍기,남영수 한양대학교 의과대학 2000 한양의대 학술지 Vol.20 No.2

To compare 5-fluorouracil plus epirubicin (FE) to 5-fluorouracil plus cisplatin (FP) chemotherapy as adjuvant therapy for patients with resected gastric cancer. Between August 1995 and March 2000, 46 patients with completely resected gastric cancer received six courses of FE (5-fluorouracil 1000mg/m2/day, D2-D5, epirubicin 70mg/m2, D1) or FP (5-fluorouracil 1000mg/m2/day, D2-D5, cisplatin 70mg/m2, D1) chemotherapy. The 23 patients were assigned to each treatment group. A total of 127 courses of treatment were given both FE and FP group. The FP group tended to show more risk of overall death rate. But there were no differences between FE and FP groups in terms of overall survival or disease-free survival. Both treatment arms were generally well tolerated to chemotherapy. We concluded to be no significant differences between FE and FP groups in terms of overall survival or disease-free survival. To define the efficacy of adjuvant chemotherapy for gastric adenocarcinoma, further prospective randomized trials with large number of patients should be warranted.

支準率과 通貨量에 대한 實證分析

최선기,장동학 천안대학교 2002 천안외국어대학논문집 Vol.- No.2

This article has examined closely the standard multiplier model of the money supply process of Korea, specifically questioning the view that the adjusted monetary base multiplier is independent of the policy actions of the currency and thus, depends on a number of factors that are unrelated to the demand for checkable deposits. And because the stock of checkable deposits has been more closely tied to the quantity of reserves supplied by the central banks, changes in monetary policy result in changes in the ratio of currency to checkable deposits and consequently, changes in the multiplier. Theoretical and empirical considerations suggest that the multiplier has never been independent of policy. the elimination of reserve requirements on some non-transaction accounts and the extension of central banks reserve requirements to all depository institutions has greatly increased the association between checkable deposits and reserves. These changes have increased significantly the association between changes in monetary policy actions and changes in the multiplier. That the multiplier is affected by policy actions suggests that money stock control using the multiplier model would be enhanced by taking into account the effect of policy actions on the multiplier.

하악 제3대구치가 하악 우각부골절 정복술후 감염에 미치는 영향에 관한 연구

최문기,민승기,이동근,오승환 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.3

Any fracture passing through the socket of a teeth is compounded intraorally, even if the fracture is not displaced and the tooth is firm in its socket. Before the advent of antibiotic therapy the danger of infection in a compounded fracture posed severe problems in treatment. Infection is reduced by antibiotic therapy but prolonged use of antibiotics is not justified in an attempt to save a tooth which might eventually be sacrificed. There is still controversy in the management of third molar in mandibualr angle fracture, particularly in regard to their retention or removal at the time of fracture treatment. So we surveyed the 159 patients who were treated with open reduction of mandibular angle fracture containing third molar in fracture line, and compared with the postoperative infection rate depending on time intervals between injury and operation, eruption state of third molar, non-extraction or extraction of third molar related to eruption state, non-extraction or extraction of third molar related to condiition of third molar and its surrounding periodontium and were to propose treatment guidline of third molar in mandibular angle fracture The results obtained were as follows : 1.There were no statistical significance between the time from injury to operation and postoperative infection. 2.There were no statistical significance between eruption state of third molar and postoperative infection. 3.In case of retention of the third molar, there were no statistical significance between eruption state of third molar and postoperative infection, but in case of extraction, postoperative infection was high rate in complete impacted cases. 4.There were no statistical significance between non-extraction or extraction of third molar and postoperative infection depending on condition of third molar. There are no difference in infection rate statistically according to the time from injury to operation, eruption state and condition of third molar, but retention of third molar revealed lowered infection rate in completely impacted cases. By terms of the manegement of third molar, we should extract or preserve third molar in the line of the mandibular angle fracture according to possibility of infection.

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.

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.

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.

치과병원에서 사용되는 진단영상에 대한 JPEG 2000 압축률에 대한 평가

정기훈,한원정,유동수,최순철,김은경 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.3

Purpose : To find out the proper compression ratios without degrading image quality and affecting lesion detectability on diagnostic images used in dentistry compressed with JPEG 2000 algorithm. Materials and Methods : Sixty Digora periapical images, sixty panoramic computed radiographic (CR) images, sixty computed tomographic (CT) images, and sixty magnetic resonance (MR) images were compressed into JPEG 2000 with ratios of 10 levels from 5 : 1 to 50 : 1. To evaluate the lesion detectability, the images were graded with 5 levels (1: definitely absent; 2: probably absent; 3: equivocal; 4: probably present; 5: definitely present), and then receiver operating characteristic analysis was performed using the original image as a gold standard. Also to evaluate subjectively the image quality, the images were graded with 5 levels (1: definitely unacceptable; 2: probably unacceptable; 3: equivocal; 4: probably acceptable; 5: definitely acceptable), and then paired t-test was performed. Results : In Digora, CR panoramic and CT images, compressed images up to ratios of 15 : 1 showed nearly the same lesion detectability as original images, and in MR images, compressed images did up to ratios of 25 : 1. In Digora and CR panoramic images, compressed images up to ratios of 5 : 1 showed little difference between the original and reconstructed images in subjective assessment of image quality. In CT images, compressed images did up to ratios of 10 : 1 and in MR images up to ratios of 15 : 1. Conclusion : We considered compression ratios up to 5 : 1 in Digora and CR panoramic images, up to 10 : 1 in CT images, up to 15 : 1 in MR images as clinically applicable compression ratios.

韓國勞使關係의 發展過程과 定立方向

장동학,최선기 천안대학교 2001 천안외국어대학논문집 Vol.- No.1

한국의 노사관계는 그 어느 국가보다도 짧은 역사를 가지고 있다. 즉 끊임없는 외세의 침입과 일제 36년 등 노사관계가 발전할 수 있는 토대가 전혀 마련되지 않았다. 그렇기 때문에 노사관계가 후진성을 면치 못했다. 이같은 사실은 그동안의 노사관계의 발전과정에서도 여실히 드러나고 있다. 노사관계라는 것은 서로 대등한 위치에서의 관계정립을 뜻한다. 그럼에도 불구하고 지금까지의 노사관계는 어느 일방 특히 사용자측에 치우쳐 왔던 것이 사실이다. 물론 이것이 6.29선언 이후 오히려 사용자측에 부담으로 작용한 면이 없지 않으나 어쨌든 대등한 관계라는 노사관계의 의미에 큰 흠집을 남겼다. 특히 노사간의 조정자로서의 역할을 수행하여야 할 정부가 이를 조장한 면이 없지 않았다. 이제는 바뀌어야 한다. 노사관계가 큰 틀 속에서 서로 견제와 균형을 이루는 관계 속에서 발전해 나가야 한다. 그러기 위해서는 노사관계를 이루는 근로자와 사용자 그리고 조정자로서의 정부가 함께 노력해야 한다. 근로자와 사용자 그리고 정부가 함께 노력할 때 진정한 노사관계, 보다 성숙된 노사관계가 형성될 수 있을 것이다.

섬유강화 고분자 복합판의 기계적 성질에 미치는 섬유길이와 섬유함유율의 영향

이상동,김혁,허업,최종대,이동기 조선대학교 에너지.자원신기술연구소 1997 에너지·자원신기술연구소 논문지 Vol.19 No.2

This paper describes effect of chopped strand length fiber content and moisture absorption on mechanical properties of fiber-reinforced polymeric composites. It was extrusion compounded long fiber-reinforced polypropylene containing 20, 30 and 50 percent and short fiber-reinforced ABS and PAS containing 30 percent b37 the weight of glass fiber. The test methods of ASTM D638, D3410-87 and D79OM are applied for tensile, compressive and bending tests respectively. The results show that, in the case of 0.2% moisture absorption, the residual strength decreases dramatically.