단일상 Natural Polygonum Tinctroium 염료의 특성

최창용,양숙향,나재운 한국공업화학회 2004 응용화학 Vol.8 No.2

Indigo, as a blue pigment, has been known as one of the oldest natural dyes. Generally, natural dyes have moderate colors and are environmentally friendly, while harmful mordants must be used for fixing them and obtaining a full color range on fabrics and it is very hard to improve K/S of the dyeing and mordanting. In this study, single solid phase polygonum tinctroium dye was prepared by don- agitator and lyophilization and physicochemical characterization of polygoum tinctoria dye substance was investigated by UV/VIS spectrophotometer, TLC, DSC, FT-IR spectrophotometer, ¹H-NMR spectrophotometer, HPLC, MALDI-TOF mass, CHNS/O. Also cytotoxicity study of polygonum tinctroium dye was carried out MTT-assay.

무선랜용 Q-대역 0.25㎛ pHEMT MMIC 저잡음증폭기 설계

최우성,이원조,권태운,최재하 울산대학교 2002 공학연구논문집 Vol.33 No.1

본 논문에서는 무선랜용 수신 시스템의 첫 단에 쓰이는 Q-대역 2단 MMIC 저잡음 증폭기를 설계하였다. 설계된 증폭기의 이득은 10.312±0.5㏈, 잡음지수는 2.677㏈이다. 입력 정재파비 VSWR_in = 1.072이고, 출력 정재파비 VSWR_out = 1.055이며, 1㏈ 이득압축점은 5.824㏈m IIP9는 13㏈m이다. 이번 저잡음 증폭기 설계에 사용된 pHEMT는 HP-EEsof사의 각각 0.25㎛×50㎛ 크기의 2-finger 루트모델이다. 제작을 위한 레이아웃은 칩사이즈가 1,800×1,500㎛이다 칩사이즈를 고려해서 바이어스딘의 λ/4 라인은 구부려서 구성하였으며 1단과 2단은 50Ω 정합을 하였다. In this paper, the design of Q-band 0.25㎛ pHEMT MMIC 2-Stage Low Noise Amplifier for Wireless LAN is discussed. The LNA has a gain of 10.312±0.5㏈ and a noise figure of 2.677㏈. An input VSWR of the LNA is 1.072 and an output VSWR of the LNA is 1.055. 1㏈ gain compression point of the LNA is 5.824㏈m and IIP of the LNA is 13㏈m. In this paper, HP EEsof's pHEMT 2-finger ROOT Model of 0.25㎛×50㎛ is used. The layout chip size for manufacturing is 1,800㎛×1,500㎛. To reduce the size, a curved shape is adapted for λ/4-line realization. The first and second stage are matched to 50Ω.

手腕部骨 成熟段階에 따른 頭部放射線計則學的 硏究

최해운,김재형,홍성준 全北大學校 齒醫學硏究所 1986 전북치대논문집 Vol.4 No.1

To investigate the relationship between craniofacial growth and bone maturity of the hand wrist in normal occlusion, the author took cephalogram and hand wrist adiogram of 391 students(male 192, female 199) and assessed the measurements of cephalogram according to skeletal maturity stages of the hand and wrist. In this study, four skeketal stages and 36 linear, angular measurements of the cephalometrics were selected. In hand-wrist X-ray the bone used to determine skeletal maturity were the middle phalanges of the third finger, and distal epiphysis of the radius. In cephalogram, the landmark used to measure the angle and length were N, S, Po., Ar., Go., Me., Gn., Pog., Point B, Point A, ANS, PNS, Or., U1, L1, U6, L6 etc.. The results were as follows ; 1. The table of mean, standared deviation, p-value from measurements were made in each group and both sex. 2. The measurements increased according to skeletal maturity were anterior cranial bese length, posterior cranial base length, ramus height, anterior facial height, posterior facial height, L1 to mandibular plane(㎜), facial plane angle. In contrast to, decreased measurements were gonial angle, facial convexity and facial plane angle. 3. Denture pattern measurements(IMPA, FMIA, occlusal plane to GoGn, interincisal angle, U1 to SN plane, U1 to SN plane, U1 to facial plane, L1 to facial plane etc.) had nothing to do with skeletal maturity. 4. Skeletal maturity had close relation with craniofacial growth, but had little to do with tooth development.

한국인의 문화예술 여가활동 실태 조사

최영렬,유재충,전익기,김태운,안세욱 경희대학교 사회체육연구소 1996 體育科學論叢 Vol.- No.9

The Purpose of this study was to investigate leisuer activities in the age of 30's and 40's. The total sample consisted of 2,125 in the age of 30's and 40's. The data were obtained through questionnaires which were modified, interviwed, and collected by the researcher. A number of statistical procedures, Descriptive Statistics and ANOVA, were used to analyze the datd. An analysis of study determined the ersults as fllowings: 1) Male' and female' leisure time during the week and weekend was less than 3 hours. 2) Male's motivation and purpose to participate in leisure activities was "Spending time moderately" and female' motivation and purposr to participate in leisure activities was "Minimalize stress". 3) There was no differnece between males and females in terms of having leisure activities with their families. 4) No matter the gender, they were unsatisfied with a welfare system which provided local government. 5) They favorited a welfare policy where every other Saturday was a holiday.

手腕部骨成熟段階에 따른 頭部放射線計則學的 硏究

崔海雲,金在衡 대한치과교정학회 1987 대한치과교정학회지 Vol.17 No.1

To investigate the relationship between craniofacial growth and bone maturity of the hand wrist in normal occlusion, the author took cephalogram and handwrist radiogram of 391 students (male 192, female 199) and assessed the measurements of cephalogram according to skeletal maturity stages of the hand and wrist. In this study, four skeketal stages and 36 linear, angular measurements of the cephalometrics were selected. In hand-wrist X-ray the bones used to determine skeletal maturity were the middle phalanges of the third finger, and distal epiphysis of the radius. In cephalogram, the landmark used to measure the angle and length were N, S, Po., Ar., Go., Me., Gn., Pog., Point B, Point A, ANS, PNS, Or., U1, L1, U6, L6 etc. The results were as follows, 1. The table of mean, standard deviation, p-value from measurements were made in each group and both sex. 2. The increased measurements according to skeletal maturity were anterior cranial bese length, posterior cranial base length, ramus height, anterior facial height, posterior facial height, L1 to mandibular plane (mm), facial plane angle. In contrast to, decreased measurements were gonial angle, facial cnvexity and facial plane angle. 3. Denture pattern measurements (IMPA, FMIA, occlusal plane to Go-Gn, interincisal angle, U1 to SN plane, U1 to SN plane, U1 to facial plane, L1 to facial plane etc.) had nothing to do withskeletal maturity. 4. Skeletal maturity had close relationship with craniofacial growth, but had little to do with tooth development.

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.

합병의 영업성과 개선에 관한 연구 : 외환위기 이후 국내기업을 중심으로

최운열,황재학 서강대학교 경영연구소 2005 서강경영논총 Vol.16 No.2

(Sr.Ca)TiO_(3)세라믹스의 C-V특성과 Ca의 역할

최운식,강재훈 대불대학교 2002 大佛大學校大學院 硏究論文集 Vol.- No.1

It this study, the capacitance-voltage properties of (Sr_(1-x)·Ca_(x))TiO_(3)(0.05≤x≤0.20)-based grain boundary layer ceramics were investigated. The ceramics were fabricated by the conventional oxide-mixed method. The sintering temperature and time were 1480∼1500℃ and 4hour, respectively. The 2nd phase formed by the thermal diffusion of CuO from the surface leads to very excellent dielectric properties, that is, ε_(γ)>50000, tanδ<0.05, ΔC<±10%. The capacitance is almost unchanged below about 20[V] but it decreases slowly over 20[V]. The results of the capacitance-voltage properties indicated that the grain boundary was composed of the continuous insulating layers. The voltage-current characteristics was due to space charge condensed to interface between grain and grain boundary. The specimens treated thermal diffusion in 1150℃ for 2hrs appeared nonlinearity characteristic of α>7.

테니스에 대한 태도와 참가 의도의 관계

최재운,한이영 한국스포츠리서치 2001 한국 스포츠 리서치 Vol.12 No.4

The purpose of this study was to investigate the relationship between attitude toward tennis and intention across tennis participation stage. Subjects(N = 281) of this study were tennis participants of N and C city in C province who were selected using systemic purposeful sampling. All subjects completed the attitude toward tennis and intention questionnaire. Collected data were analyzed using correlation analysis, regression analysis, and structural equation modeling for latent variables. The conclusions were as followings: First, the planned behavior theory have higher structural validity to explain the tennis participating phenomena of tennis adoption stage. Second, the direct effect of attitude toward tennis on intention is greater than subjective norm in tennis adoption stage. Third, the planned behavior theory have higher structural validity to explain the tennis participating phenomena of tennis adherence stage. Fourth, the direct effect of subjective norm on intention is greater than attitude toward tennis in tennis adherence stage.

MPDS 患者의 臨床的 樣相

崔在甲,鄭雲夏 慶北大學校 齒科大學 1984 慶北齒大論文集 Vol.1 No.1

The author has studied on the clinical features and symptomatology of 97 MPDS patients, who visited the Dept. of Dentistry, Kyungpook National University Hospital, from January to September in 1982. The results were as follow: In age and sex distribution of patients in this population, the third decades appeared to have the highest prevalence and the male to female ratio was almost 1 to 2.23. As to occupation, students and housewives were revealed to have the highest incidence of MPDS. The chief complaints of patients were pains, TMJ noises, and limitation of mouth opening in order of frequency, and the most prevalent site of symptom was that of preauricular area. In symptom sequence, the majority of initial symptoms were TMJ noise and pain but limitation of mandibular movement was progressively developed, regardless of nature of early symptoms. Chronic unfavorable oral habits were found to be the most possible predisposing factors in this study. The average maximum interincisal distance was 38.13 ± 10.00 mm in males and 30.73 ± 8.75 mm in females, and a deviation of mandible during mouth opening was observed in 60.8% of patients. In TMJ signs, tenderness of the TMJ to palpation was found in 60.8% of patients and TMJ noise was audible in 50.5% of patients with a stethoscope. The muscles of masticatory system were palpated according to usual methods, and a significant incidence of muscular tenderness was present, with the lateral pterygoid muscles being most frequently involved, followed by masseter, medial pterygoid and temporalis muscles.