초음파를 이용한 3차원 형상인식에 관한 연구

玄淸男 홍익대학교 산업기술연구소 1998 産業技術 Vol.8 No.-

Recently a number of researches have been preformed for the various method of shape recognition of objects. An algorithm was developed for recongnition of shape of arbitrary objects using ultrasonics. It was possible to measure the distance, the thickness and the real shape of the objects as well as the image of them using the experimental method developed here. Thus the following results were obtained; 1. the basic algorithm for the recognition of shape of arbitrary objects can applied to the real structures in the industry. 2. the error of measurement using the current method is within 1-4% compared to the real shape, 3. The errors in this research can be classified into three categories. 1) There are errors in the scanning for the curved-surface. 2) There are errors in the algorithm. 3) There exist error in the oblique inclidence. 4. Therefore, if errors in the oblique incidence and errors in the curved-surface are considered, more accurate recognition system can be established.

C - Scan을 이용한 시편 내부의 결함 측정 및 탐상 (Ⅱ)

玄淸男,韓材國 弘益大學校 産業技術硏究所 2004 産業技術 Vol.14 No.-

In this study, the flaws in the several test specimens are detected by using a C-Scan system. The following results are obtained through this research; 1. How to detect the flaws in the specimens 2. How to determine the depth of the flaws in the specimens 3. How to determine the size of the flaws in the specimens 4. How to determine if the specimen is in one piece or not and how to detect defects at the joining part 5. Analysis by using Linear Profile and 3D View In order to determine the depth and size of the flaws in the specimens precisely, it is very important to operate the C-Scan system properly

C-Scan 장치를 이용한 초음파 탐상에 관한 연구 [Ⅲ]

玄淸男 弘益大學校 産業技術硏究所 2005 産業技術 Vol.15 No.-

In this study, the flaws in the several test specimens are detected by using a C-Scan system. The following results are obtained through this research; 1. How to detect the flaws in the specimens 2. How to determine the depth of the flaws in the specimens,. How to determine the size of the flaws in the specimens 3. How to determine if the specimen is in one piece or not and how to detect defects at the joining part 4. Analysis by using Linear Profile and 3D View In order to determine the depth and size of the flaws in the specimens precisely, it is very important to operate the C-Scan system properly

노인의 갑상선기능저하증에 대한 임상적 연구

정윤석,남문석,이은직,김경래,이현철,김현승,허갑범 한국노화학회 1993 한국노화학회지 Vol.3 No.1

C-Scan 장치를 이용한 초음파 탐상에 관한 연구(Ⅰ)

玄淸男,韓熙悳 홍익대학교 산업기술연구소 2003 産業技術 Vol.13 No.-

In this study, the flaws in the several test specimens are detected by using a C-Scan system. The following results are obtained through this research; 1. How to detect the flows in the specimens 2. How to determine the depth of the flaws in the specimens 3. How to determine the size of the flaws in the specimens 4. How to determine if the specimen is in one piece or not and how to detect defects at the joining part 5. Analysis by using Linear Profile and 3D View In order to determine the depth and size of the flaws in the specimens precisely, it is very important to operate the C-Scan system properly.

全南地方의 農村과 都市人의 식이구성에 關한 比較 硏究

정영희,남현근 광주보건대학 1975 論文集 Vol.2 No.-

In order to know the Diets of Urban and Rural of Jeonnam Area, Nutrition survey carried out through two years. 1) In urban area, average intake of the 1, 2, 3, food-stuff groups per day is 969.66 gr(1974), 1,058.16 gr(1975). 2) In rural area, average intake of the 1, 2, 3, food-stuff groups per adult per day is 1,003.12 gr (1974), 949.70 gr (1975). 3) In urban area, Average intake of Nutritional elements per adult per day 433.88 gr(1974), 490.04 gr(1975), and in rural area, 604.41 gr(%974), 568,87 gr(1975). 4) Average Calorie distribution of the Nutritional elements per adult per day is 12.51% (Protein), 7.46% (Fat), 80.03% (Carbohydrates) in 1974 and 12.31% (Protein), 13.49%(Fats), 74.19% (Carbohydrates) in 1975 for the urban area. 5) In the rural area average, Calorie distribution per adult per day is 11.12% (potein), 5.37% (Fats), 83.61% (Carbohydrates), in 1974 and 11.44% (Protein), 9.83% (Fats), 78.73% (Carbohydrates) in 1975. 6) In the urban, ratio the animal protein per total protein intake is 30.29% in 1974, and 34.13% in the rural, 16.8% (1974), 15.26% (1975) average intake per adult per day respetively. 7) In aspect of Calorie: In the urban area, intaked Calorie is 2,525. 87 Cal in 1974, 2,533.05 Cal in 1975: In the rural area, intaked Calorie is 2,569.18 Cal in 1974, 2,45 0.82 Cal in. 1974. 8) In aspect of inorganic material, in the urban, amount of Ca intake is 569.97mg in 1974, 576.83 mg in 1975: in the rural, amount of Ca intake is 325.01 mg in 1975,385.84 mg in 1975. 9) In the urban, Fe intaked is 16:12mg in 1974, 12.74mg in 1975, In the rural, 7.26mg in 1974, 9.73mg in 1975.

운동이 Prednisolone투여 골격근에 미치는 효과 연구

남용현,오정희 고려대학교 의과대학 1990 고려대 의대 잡지 Vol.27 No.3

The effect of exercise on the skeletal muscle treated with prednisolone was studied by estimating the diameters of medial head of gastrocnemius and soleus muscle of the rat. The size of muscle fiber was determined by direct measuring the cross sectional diameter of dissected muscle stained by hematoxiline-eosin. The experimental rats were divided into 6 groups: control group, the exercised control group without prednisolone treatment, the exercised group with 5, 10, 15 days of prednisolone treatment and the exercised group which had 30 days of recovery period after 15 days of prednisolone treatment. The cross sectional diameters of the groups were 49.54±12.23㎛, 75.94±30.37㎛, 65.28±18.62㎛, 63.77±13.37㎛, 64.72±13.39㎛, and 77.87±14.11㎛ respectively in medial head of gastrocnemius and 50.78±12.15㎛, 64.48±13.91㎛, 60.26±14.31, 62.07±14.52㎛, 62.06±17.91㎛ and 70.98±15.82㎛, respectively in soleus. These data demonstrated that the cross sectional diameters of muscle fibers were enlarged significantly by exercise from 28.7% to over 31.8% in the medial head of gastrocnemius and 18.7% to over 23.5% in soleus muscle(p<0.001) in comparison with those of the control, but the decrement of the size was observed when the diameters were compared with those of the exercised group without prednisolone treatment (p<0.001). The increment rates were noted during the initial stage of exercise(p<0.001), but no further increases were observed during the late stage of exercise (p>0.05) urlth prednisolone treatment in both muscles.

Al-7%Zn 합금에 대한 Ti, B 및 Ti-B의 첨가 영향에 관하여

玄淸男 홍익대학교 산업기술연구소 1997 産業技術 Vol.7 No.-

The influence of small amount of Ti B and Ti-B in Al-7% Zn alloy was investigated by means of tensile strength, elongation and micro viker's hardness. The results obtained were as follows: 1. The addtion of a small amount of TiB and Ti-B did not show scarecely and remarkable effect upon the mechanical properties of A7% Zn alloy. Especially, in this alloy, it was found that the worked direction did not effect the mechanical properties at all. 2. The effect of Ti addition on the mechanical properties was more pronounced than of boron or Titanium-Boron.

마그네슘, 칼슘이 혈청콜레스테롤 농도의 저하에 미치는 영향(Ⅰ)

남현근,정영태 광주보건대학 1985 論文集 Vol.10 No.-

The effects of dietary calcium, magnesium on the serum cholesterol concentration in rabbit was studied for a period of 21 days using isocalories and isonitrogenous basal diet. It is investigated that the serum cholesterol level lowering 10-30% by feeding with calcium and magnesium containning diet was performed. There was no effect for the total protein, but there was some sort of effect for albumin and globulin. Particulary, the beta-globulin concentration was decreased by calcium and magnesium containning diet. It is, also, investigated that there is almost no effect for the electrolytes concentration transport and phenomena in the cell through magnesium and calcium containning diets.

공구 윗면 경사각의 변화에 따른 연질 재료(Al-Alloy and Cu-Alloy)의 절삭성에 관한 연구

玄淸男 홍익대학교 산업기술연구소 1994 産業技術 Vol.4 No.-

In turning operation, it is the material of work piece and cutting tool, feed and cutting speed the depth of cut and rake angle influence upon the accuracy of demension the manufacturing efficiency the extension of tool life and surface roughness. Especially the identification of cutting force due to the change of tool rake angle, which exerts a grate influence on the turning is very important. In this study the cutting force of test materials such as Al-alloy surface roughness were measured by experiment. And the cutting resistance due to the change of tool rake angle was calculated by applying the three- demensional cutting formula then the conditions of optimal machinability were obtained taking into consideration of the material characteristics. From the experimental results. the conditions of optimal machinability classified by the test materials are as follows: 1) The normal force acting on the tool face has the minimum value at the true rake angle of 10˚ -15˚ in Brass. 2) The specific cutting resistance is inversely proportional to the deoth of cut. feed and cutting speed and the reduction rates of speific cutting resistance has large values. Al- alloy and Cu-ally the reduction rates are almost constant enve though the tool rake angle increase. 3) The batter surface roughness is obtained when the cutting speed and the cutting depth decrease. when the cutting speed is more than 150m/min. a batter surface roughness is obtained. 4) The confitions of optimal machinability for Al- alloy and Cu-ally are the true rake angle of about 100- 15˚ and the cutting speed of 200m/min.