경량 고강도 Mg-Zn계합금의 조직과 내식성에 관한 연구

안효준,남태현,임수근,안인섭,허보영,김기원 慶尙大學校 1995 論文集 Vol.34 No.1

The purpose in this study is to develope of high strength and corrosion reistant Mg-Zn system alloys by controlling microstructures and by adding of Cu elements. To produce optimum tesile strength,it is imperative to obtain effective grain refinment during casting. Optimal condition for grain size refining effect was obtained at the minmum composotion of 2wt% Cu or 1.5wt%So addition to Mg-6wt%Zn alloy.Age hardening behavior was experimented at the optimal compositions of the Mg-6wt%Zn, Mg-6wt%Zn-2wt%Cu and Mg-6wt%Zn-1.5wt%Si. The hardeness increment due to age hardening was at the Mg-Zn-Si alloy system. The improvement of corrosion resistanece by the addition with Cu is related to and increasing Zn/Cu ration in the intermatallic particles in the Mg-Zn system.Further improvements obtained by T6 treatment are related to the properties of the Mg-Zn phase,whih acts as a corrosion barrier by precipitating along the grainboundaries.Filiform corrosion observed soon after pit initiation and cellular form of pit propagation later in chloride media are explained in terms of solid solution matrix structure and the properties of air formed oxide.The information obtained from the fundamental research work is utilized in suggesting ways of improving the corrosion resistance of commercial AZ91.

가정환경에 따른 초등학생의 한약 이용 실태에 관한 연구

안영준,박태숙 朝鮮大學校 附設 醫學硏究所 2008 The Medical Journal of Chosun University Vol.33 No.2

Background and Objectives: Actually, traditional herbal medicine may be overused in Korea. Expenditures of hospital cost & distrusts of scientific medicine are increasing gradually. So we surveyed the states of herbal medicine use according to home conditions among elementary school pupils. Materials and Methods: We interviewed pupils of three elementary schools in Gwangju with survey papers from 1st to 31th on May in 2007. We analyzed 905 returned surveys. Results: The number of pupils who have taken herbal medicines since birth was 590 (65.2 percent). The rate of herbal medicine use in male and in female was 68.9 percent, 62.0 percent and in apartment house and in western house was 72.9 percent, 60.3 percent, respectively. The rate of herbal medicine use in male and in apartment house was significant. The rate of herbal medicine use in above 1 million income was 68.8 percent and was higher significantly than in below 1 million income. There was no significant in the rate of herbal medicine use according to the religion of their parents. The rate herbal medicine use in graduated degree of their mother was 69.0 percent and was significant. The common reasons of herbal medicine use were looking weak without disease, for health promotion, frequent illnesses, orderly. Most of their parents thought about herbal medicine use positively (73.9 percent). Conclusion: The rate of herbal medicine use in elementary pupils was high. The rate of herbal medicine use was higher significantly in male, in apartment house, in above 1 million income & in graduated degree of mother. Their thoughts about herbal medicine use were positive, but may be a chance to distort western medicine.

Nematicidal and egg‐hatching inhibition activities of Kaempferia galanga rhizome‐derived materials and constituents toward root‐knot nematode (Meloidogyne incognita)

Tae‐Kyun Hong,Kym‐Na‐Ra Hwang,Jun‐Ran Kim,Young‐Joon Ahn 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10

The toxicity of Kaempferia galanga rhizome materials and constituents against Meloidogyne incognita second‐stage juveniles (J2) and eggs were examined. The active principles of K. galanga rhizome were identified as the phenylpropanoids ethyl (E)‐cinnamate (EC, 1) and ethyl (E)‐p‐methoxycinnamate (EMC, 2) by spectroscopic analysis. Results were compared with those of carbofuran, fosthiazate, and metam‐sodium. In direct‐contact mortality bioassay, EC (LC50, 0.037 mg/ml) was the most toxic constituent, followed by EMC (0.041 mg/ml). EC was more effective than carbofuran (LC50, 0.092 mg/ml) but less active than fosthiazate (0.002 mg/ml). EC, egg hatch was inhibited 100, 93, and 87% at 125, 62.5, and 31.25 μg/ml, respectively. EMC caused 100, 81, and 75% inhibition of egg hatch at 125, 62.5, and 31.25 μg/ml, respectively. The inhibition of two phenylpropanoids were similar or more inhibition to that of either carbofuran or metam‐sodium but was lower than that of fosthiazate. In contact + fumigant mortality bioassay, EC and EMC treatments resulted in 86 and c 73% mortality at 0.5 and 0.125 mg/g soil, respectively. The lethality of these phenylpropanoids was almost similar to that of either carbofuran or metam‐sodium but was lower than that of fosthiazate. In vapor‐phase mortality bioassay, EC and EMC were more effective in closed container than open containers, indicating that the mode of delivery of these compounds was, in part, a result of vapor action. K. galanga rhizome‐derived materials, merit further study as potential nematicides and hatching inhibitors for the control of M. incognita populations.

능동 클램프 ZVS 플라이백 컨버터의 역률개선에 관한 연구

최태영,류동균,이우석,안정준,원충연,김수석 성균관대학교 2002 학술회의지원논문목록집 Vol.2002 No.-

본 논문에서는 single-stage, two-stage 두가지 역률보상(PFC)기법을 기존의 능동 클램프 플라이백 컨버터에 적용하여 역률 개선을 하였다. 삽입된 플라이백 컨버터의 능동클램프회로가 주스위치와 보조스위치의 영전압스위칭(ZVS)을 구현하며, 스위칭 손실을 줄임으로써 고효율을 얻을 수 있고, 높은 주파수에서의 스위칭이 가능하다. 하지만 일반적으로 사용되는 다이오드정류기, 평활용커패시터에 의한 낮은 역률의 문제점이 남아있다. 본 논문에서는 300W급 능동 클램프ZVS플라이백 컨버터를 설계하여 single-stage, two-stage방식을 적용, 입력역률개선을 시뮬레이션과 실험에 의해 입증하고자 한다. This paper analyzed PFC of active clamp ZVS flyback converter by adding two method PFC (Power Factor Correction) circuit - two-stage and single-stage. The addition of active clamp circuit also provide a mechanism for achieving ZVS of both the primary and auxiliary switches. ZVS also limits the turn off di/dt of the output rectifier, reducing rectifier switching loss and switching noise, due to diode reverse recovery. As a results, the proposed converters have characteristics of the reduced switching noise and high efficiency in comparison to conventional flyback converter. The simulation and experimental results show that the proposed converters improve the input PF of 300W ZVS flyback converter by adding single-stage, two-stage PFC circuit.

비만 여중생과 정상 여중생의 혈중지질 비교분석

김태운,신군수,김종인,이광무,김성헌,안병철,고기준 釜山大學校 附設 體育科學硏究所 1995 體育科學硏究所 論文集 Vol.11 No.-

The purpose of this study was to analyze and identify the serum lipids of the middle school girls in order to utilize them as the basic data for the prevention of the middle school girls against arteriosclerosis and diabetes tending to lower age. We used total of twelve middle school girls as subject and devided them into two groups : obese group(n=6), normal group(n=6). The measurement items were the Total-cholesterol, HDL-cholesterol, LDL-cholesterol, TG, FFA. The conclusion of this study was as follows : 1. Total-cholesterol 1) All two groups was a little increased by maximal exercise, but there was no significant difference statistically. 2) Normal group was a little higher than obese group, but there was no significant difference. 2. HDL-cholesterol 1) All two groups was a little increased by maximal exercise, but there was no significant difference. 2) In comparison of two groups, normal group was a little high on empty stomach and obese group was a little high before and after exercise, but there was no significant difference. 3. LDL-cholesterol 1) All two groups was a little increased on post-exercise than pre-exercise, but there was no significant difference statistically. 2) In comparison of two groups, normal group was a little higher than obese group, but there was no significant difference. 4. Triglyceride 1) All two groups was a little increased by maximal exercise, but there was no significant difference. 2) In comparison of two groups, normal group was a little higher than obese group on empty stomach and obese group was a little higher than normal group on pre and post-exercise, but there was no significant difference. 5. T-chol./HDL-chol. 1) All two groups was a little increased by maximal exercise, but there was no significant difference. 2) In comparison of two groups, normal group was a little higher than obese group, but there was no significant difference. 6. Free Fatty Acid 1) All two groups was a little decreased by maximal exercise, but there was no significant difference. 2) In comparison of two groups, obese group was a little higher than normal group, but there was no significant difference.

자일리톨과 불화나트륨을 함유한 저작성 정제가 교정환자의 구강위생에 미치는 영향에 관한 임상시험

유상훈,안석준,이신재,백승학,김태우,장영일,남동석 대한치과교정학회 2003 대한치과교정학회지 Vol.33 No.2

본 연구는 불화나트륨과 자일리톨 성분으로 구성된 구강 청정용 저작성 정제(덴포정, 하미즐, 부천, 경기)가 교정치료 중인 환자의 구강위생 상태에 미치는 영향을 알아보기 위해 시행되었다. 교정치료 중인 18세 이상의 성인 환자 30명을 대상으로 약제 상요 전, 2주 후, 4주 후에 피험자의 상악과 하악 전치 부위 및 구치 부위에서 각각 치은 지수, 치은 출혈 지수, 치태 지수를 측정하여 다음과 같은 결과를 얻었다. 1. 상하악 전치부와 구치부 모두에서 치태 지수가 약제 사용 전에 비해 사용 2주 후와 4주 후 유의성 있게 감소하였다(p<0.05). 또한, 적용 2주 후와 4주 후의 지수를 비교하였을 때 4주 후에 좀 더 개선된 경향을 보였으나, 통계적 유의성은 나타나지 않았다(p<0.05). 2. 치은 지수, 치은 출혈 지수도 상하악 전치부와 구치부 모두에서 적용 전에 비하여 2주 후와 4주 후 유의성 있게 감소하였다(p<0.05). 적용 2주 후와 4주 후의 지수의 비교 검증에서 통계학적으로 유의할 만한 차이가 보이지 않아 구강위생 상태의 개선이 계속 유지됨을 보였다. 본 연구의 결과는 치태 지수, 치은 지수, 치은 출혈 지수가 실험 정제 적용 후에 감소하여 구강위생 상태가 개선되었음을 보였다. 이러한 결과를 통해 덴포정을 교정치료 중인 환자에서 부가적으로 사용하였을 경우 치주조직의 건강을 증진시키는데 도움을 줄 수 있으리라고 생각된다. The aim of this study was to evaluate the effect a chewable tablet containing sodium fluoride and xylitol (DenPo, Hamizzle, Bucheon, Kyungki) on the oral hygiene state in the orthodontic patients. The subjects consisted of 30 adult orthodontic patients, who have worn the fixed orthodontic appliance at least 6 months. They were instructed to use the tablet forth a day. Gingival index (GI), plaque index (PI), and sulcus bleeding index (SBI) of upper and lower anterior and posterior regions were measured before using the tablet (TO), 2 weeks after using the tablet (T1), and 4 weeks after using the tablet (T2). The data were analyzed with Wilcoxon signed ranks tests. The results were as follows ; 1. PI was decreased significantly in the T1 and T2 stage compared with TO stage in the both anterior and posterior regions (p<0.05). Although PI was decreased in the T2 stage compared with T1, there was not statistical significance(p>0.05). 2. GI and SBI showed similar results compared with PL. In the T1 and T2 stage, there was statistically significant decrease in the GI and SBI (p<0.05). This study showed that the DenPo tablet could be used as an adjunct to improve oral hygiene in the orthodontic patients. The decrease of the indices may suggest that DenPo tablet could be effective in the plaque removal and prevention of gingival inflammation in the orthodontic patients.

정상교합자의 치관경사도에 관한 연구

이신재,안석준,,김태우 대한치과교정학회 2005 대한치과교정학회지 Vol.35 No.5

치관경사도 연구는 부정교합 진단과 치료 계획 수립 및 더욱 편리한 교정 장치 개발과 관련한 기초 자료로써 중요시 되어 왔다. 이에 본 연구는 307명(남자 187명, 여자120명)의 대표본 성인 정상교합자를 연구대상으로 삼아, 자료의 신뢰성 검증이 병행된 치관경사도를 보고함으로써 치과교정학 임상에 도움이 되는 기초자료를 도출해 보고자 시행되엇다. 치관경사도 측정을 위하여 정상교합자 표본의 모형 상에서 개개, 치아의 근원심 각도 및 협설측 각도를 측정하였으며, 측정 전후 측정자간 및 측정자 내의 신뢰성 검증을 시행하였고, 남녀간의 성차와 기존 연구자료와의 차이를 검증하였다. 연구 결과 본 연구가 대표본을 대상으로 하여 높은 신뢰성 지표를 보였음에도 불구하고 정상교합자의 치관경사도는 변동이 심한 것이 관찰되었고 이에 따라 기존 연구들에 대비하여 임상적으로 유의한 자료상의 차별성은 고찰할 수 없었으며 변동의 양상 또한 선학들이 보고한 자료와 유사하였다. 결론적으로 치관경사도 측정시 드러난 정상변동을 해석하여 개별 적합성이 최대로 증진된 효율적인 치과교정장치를 개발하기 위해 좀 더 발전된 수학적 · 통계학적 모형 구성이 필요할 것으로 생각되었다. Angulation and inclination of clinical crown is important for diagnosing. Treatment planning and developing convenient orthodontic attachments. The aim of the study was to establish normative data with higher reliability on the angulation and inclination of clinical crown of Koreans with normal occlusion. This study employed the dental casts of 307 (male, 187: female. 120) adult normal occlusion samples. The angulation and inclination of clinical crown were measured by set-up model checker. In order to ensure reliability. intra- and inter-rater error were evaluated 3 times. The resultant data obtained had excellent reliability. however. when compared with the previous data as well as with gender difference clinically signiflcant interpretation was impossible because the whithin-dataset normal variation was high. which was common pattern of angulation and inclination measuring data of previous research. The result of this biometric study seemed to suggest more substantive design of the multivariate. high-dimensional interpretation methodology of these normal variation is required if more compatible orthodontic appliance could be developed.

자가 말초혈액 조혈모세포 이식술의 임상적용

김혁,안명주,오석중,이영열,김인순,정태준,최일영,오미란,임호준,이항,김신규 한양대학교 의과대학 1999 한양의대 학술지 Vol.19 No.1

Responses to chemotherapy correlate with the increased dose of chemotherapeutic agents in some cancers, e.g. breast cancer, Ewing's sarcoma, Hodgkin's disease(HD) and non-Hodgkin's lymphoma(NHL), then for the improvement of the chemotherapy responsiveness, high-dose chemotherapy(HDCT) was proposed. But, it's application was limited due to complications, especially bone marrow suppression. HDCT and succeeding autologous peripheral blood stem cell transplantation(APBSCT) was introduced to overcome this problem. This study was designed to determine the clinical pictures including clinical parameters and the responsiveness of HDCT followed by APBSCT in Hanyang University Hospital. Ten patients were enrolled. They were 8 adults (3 breast cancers, 3 multiple myelomas, 1 HD, 1 NHL) and 2 children (1 acute myelogenous leukemia (AML), 1 neuroblastoma). Mobilization chemocherapy(MCT) followed by Granulocyte Colony Stimulating Factor(G-CSF) was administered to mobilize stem cells from bone marrow to peripheral blood. The stem cells were collected by using CS-3000 and cryopreserved at -196℃ with programmed controlled rate freezer as the mixture with 10% dimethyl sulfoxide(DMSO). HDCT was administered and cryopreserved peripheral stem cells were infused on day 0 as planned. Patients' mean age was 41 years old. After induction chemotherapy three patients achieved complete response and 5 partial response. The median time for bone marrow recovery after MCT was 11.5 days for neutrophil(〉500/㎣) and 4.8 days for platelet(〉20,000/㎣). There were three cases of neutropenic fever and one case of gingivitis. After HDCT with APBSCT, one patient was converted partial response to complete response, and one patient achieved complete response after HDCT without induction chemotherapy. The median time for bone marrow recovery was 12.7 days for neutrophil(〉500/㎣) and 14.7 days for platelet(〉20,000/㎣). Eight patients developed neutropenic fever and required systemic antibiotics. Transfusion was required 1.6 pints for packed red cell and 23.4 pints for platelet concentrates. Toxicity consisted mainly of vomiting, diarrhea, and mucositis which were mild. HDCT with APBSCT can be performed safely with minimal complications. For the evaluation of the exact role of HDCT with APBSCT in malignant diseases, further studies are required as a large scale of patients and lung-term follow up.

졸겔법에 의한 알루미나 박막의 제조 및 특성(Ⅰ) ; 코팅용 알루미나 sol의 합성

최세영,안준모,이재호,윤태일 연세대학교 산업기술연구소 1993 논문집 Vol.25 No.1

The properties of alumina sol for single layer Anti-Reflective film by dip-coating were investigated. Transparent alumina sol could be obtained by heating the sol within 2 hours after hydrolysis at room temperature. The particle size of sols decreased with increasing the amount of nitric acid, while the specific surface area and the total pore volume of heat treated gels increased, up to the ratio of 0.1 mol nitric acid per 1 mol alkoxide. Excess addition of nitric acid above 0.1 mol resulted in decrement of the specific surface area and the total pore volume, and broadness of the pore size distribution. The average pore diameter and the total pore volume of heat-treated gel at 400℃ with composition of 1 alkoxide·100 water·0.1 nitric acid in ratio were ?? and 0.315 cc/g, respectively.

수술-교정 치료 환자의 통제 소재

이신재,안석준,백승학,김태우,장영일,양원식,서정훈,남동석 대한치과교정학회 2002 대한치과교정학회지 Vol.32 No.4

교정치료와 악교정 수술을 필요로 하는 환자가 점증하는 현 시점에 비추어, 이에 대한 기술적인 측면의 발전과는 달리 수술-교정 치료 환자에 대한 정신사회학적 혹은 정신심리적 양상에 대한 객관적인 정보는 그리 많은 주목을 받는 편이 아니었다. 수술-교정치료는 과학적인 치료과정이긴 하지만, 어느 정도 심미적 혹은 예술적인 측면을 지니는 선택 치료의 면모를 지닌다. 그러므로 치료에 대한 환자의 주관적인 느낌은 치료 기술이나 치료의 의학적 성공 여부보다 더 큰 영향을 미칠 수 있다. 그러므로, 수술-교정 (혹은 교정) 치료에 대한 환자의 반응을 예측하기 위한 정신심리적인 정보는 치료에 유용한 지표가 될 수 있다고 가정할 수 있다. 통제 소재에 대한 연구는 인간의 다양한 행동을 예측하기 위한 유용한 지표로 알려져 왔는데, 본 연구에서는 42명의 수술-교정치료 환자와 성별/연령별로 표본 추출된 42명의 통상적 교정치료 환자를 대상으로 삼아 정신=심리적 비교 및 분석의 방법으로 두 가지 종류의 내외 통제 소재(internal/external locus of control) 검사를 시행하였다. 그 결과 수술-교정치료군에서만 남자가 여자에 비하여 낮은 외적 통제(높은 내적 통제)의 경향을 보였다. 결론적으로 수술-교정치료 환자의 정신심리적 기반은 성형 수술 환자와는 달리 교정치료 환자와 유사한 경향을 지닌 것으로 생각되었다. Surgical-orthodontic treatment is an increasingly more common dental procedure whose unique psycho-social or psychological feature has not been fairly quantified objectively. Since the treatment of a surgical-orthodontic (or orthodontic) patient is part science and part art, a subjective recognition of a patient about his or her own treatment may be more important than technical success during and after treatment. Therefore, the knowledge of the patient''s underlying psychological status could be useful in the prediction of patient's response to surgical-orthodontic (or orthodontic) treatment. The purpose of this study was to investigate and evaluate the psychological difference between conventional orthodontic patient and surgical-orthodontic patient by using locus of control (LOC) examination. Locus of control scale has been proven to be extremely useful in the prediction of a variety of human behaviors. Two types of locus of control data (I-score, Internal locus of control score ; E-score, External locus of control score) were obtained for 42 surgical-orthodontic patients and randomly selected 42 conventional orthodontic patients (as a control group) matched for age and gender. No statistically significant difference was observed in the scale of internal and external locus of control between the groups of surgical-orthodontic patients, males showed lower E-score (external locus of control score, higher internal locus of control tendency) than females. The results of this study suggested that the psychological background of surgical-orthodontic patients, in contrast with that of cosmetic surgery patients, has a similar disposition with that of orthodontic patients.