計量拔取檢査實施上의 理論硏究

崔春鎬 漢陽大學校 1979 論文集 Vol.13 No.-

The application of statistical theory to sampling inspection by variables was first initiated by Dodge-Roming and later developed further by W.A. Wallis and A.H. Bowker. Based on the test of hypothesis, this theory lays too much emphasis on the construction of a mathematical theory. As a result, the practical application of this theory to curreut industrial conditions runs into many difficulties. The necessity of another practical theory which combines theory with practicality needs no special mention here. In this paper I introduced operating characteristic coustant into sampling inspection by variables in order for it to suit the existing conditions in industries.

생활체육참여가 중년남성의 스트레스에 미치는 영향

최창준,양춘호 群山大學校 1996 論文集 Vol.23 No.-

The purpose of this study is to know the effect of participation in sports for all on middle-age men’s stress. The subjects were 233 men living in S,K, I cities of Junbuk in their 40s and 50s. The questionnaire was psychological well-being index. The contents of questionnaire were social performance and self- confidence, depression, sleeping disturbance and anxiety and general well-being and vitality. There were four groups. Group A was 64 men who had membership in sports club and participanted 6 months pericdically. Group B was 50 men who did not have membership in sports club and had participanted daily. Group C was 54 men who had never participanted daily. Group D was 85 men who had participanted one and two times a week. The results of the study were as follows, First, Group A was lower than Group C and D in stress factors of social performance and self-confidence, depression and sleeping disturbance and anxiety. Second, there was no difference in general well-being and vitality in the four groups. Third, Group A and B were lower than Group C and D in stress level. The conclusion four the above results is as follows; The women who participate in sports for all are lower than those who do not, in stress factor and stress level.

통계적발취검사법의 위상적인 一般化硏究

최춘호,김용운 漢陽大學校 1979 論文集 Vol.13 No.-

It is well known that the limit theorems of probability theory, which previously dealt primarily with the theory of summation of independent Radom theorems, have been extended to the theory of stochastic process. The authors attempt a new approach to limit theorems which can be used for many topological spaces in which in general no compleate metric exists. The authors introduced almost convergent topology in the spaces of 1st kind of discontinuous function and generalized the above mentioned results.

불규칙파랑 효과를 고려한 평형단면의 특성

최한규,이철웅,한춘호 江原大學校 産業技術硏究所 1996 産業技術硏究 Vol.16 No.-

The equilibrium beach profiles with the effects of random waves and nonuniform grain size in the surt zone are drived from the Thornton and Guza91983)'s energy dissipation model. The derived beach profiles are the functions of the breaking wave strength, the frequency of the incident wave, and the wave induced-energy dissipation at breaking point. It is not confirmed that the equilibrium beach profiles are better agreement with the measured profiles than the classical profiles. However, the characteristic of the changes of the beach profiles with respect to the breaking wave stgrngth and the frequency of the incident wave can be analyzed which has not been studied by the classical model.

일부 합성피혁 근로자들의 Dimethylformamide, Methyl Ethyl Ketone, Toluene 노출에 따른 요중 대사물질

최호춘,김강윤,안선희,이영자,정규철 한국산업위생학회 2001 한국산업보건학회지 Vol.11 No.2

This study was performed to measure airborne dimethyl-formamide(DMF), methyl ethyl ketone(MEK) and toluene and their urinary metabolites concentrations and to determine the relationship between airborne and urinary concentration. Air-borne samples and their urinary metabolites were measured 98male workers who work for 8 synthetic leather factories in a portion of Kyoung-in area. Urine samples were collected at end-of-shift to estimate the exposure levels. 1. The concentration of airborne DMF by process was 8.81 ppm for wet-mixing, 15.05 ppm for wet-coating, 6.03 ppm for dry-mixing, 5.58 ppm for dry-coating, 5.37 ppm for printing, and 9.03 ppm for total. There was statistically significant difference by process. Urinary NMF concentrations of wet-mixing, Wet-coasting, Dry-mixing, dry-coating and printing were 90.55㎎/, 79.80㎎/ℓ, 39.86㎎/ℓ, 25.23㎎/ℓ, and 38.15㎎/ℓ, respec-tively, and total geometric mean was 56.24㎎/ℓ. There was statistically significant difference by process. 2. The concentration of airborne MEK by process was 1.89 ppm for wet-mixing, 1.96 ppm for wet-coating, 10.33 ppm for dry-mixing, 29.24 ppm for dry-coating, 14.98 ppm for printing, and 4.87 ppm for total. There was statistically significant difference by process. Urinary MEK concentrations of wet-mxing, wet-coating, dry-mixing, dry-coating and printing were 0.93㎎/ℓ, 0.70㎎/ℓ, 3.29㎎/ℓ, 3.29㎎/ℓ, and 1.06㎎/ℓ, res-pectively, and total geometric mean was 1.25㎎/ℓ, There was statistically significant difference by process. Urinary MEK 3.The concentration of airborne toluene by process was 0.35ppm for wet-mixing, 0.42ppm for wet-coating, 2.95ppm for dry-mixing, 11.67ppm for dry-coating, 4.88ppm for printing, 1.24ppm for total. There was statistically significant difference by process. Urinary hippuric acid concentrations of wet-mixing, wet-coating, dry-mixing, dry-coating and printing were 0.24g/g creatinine, 0.21g/g creatinine, 0.34g/g creatinine, 0.52g/g cre-atinine, and 0.29g/g creatinine, respctively and total geometric mean was 0.28g/g creatinine. There was statistically signifi-cant difference by process. 4. No. of exceeded KPEL was 40 workers(40.8%) for DMF(10ppm), 1 worker(1.0%) for MEK(200ppm), and no worker for toluene(100ppm). No. of exceeded KBEI was 62 workers(63.3%) for urinary NMF(40㎎/ℓ), 29 workers (29.6%) for uri-nary MEK, 1 worker(1.0%) for urinary hippuric acid. 5. The regression equations were Log(MMF)=0.4094* Log(DMF)+1.3587(r=0.4516) for DMF, Log(MEKU)=0.1859* Log(MEK)-0.0324(r=0.3303) for MEK, Log(HA)=0.2106* Log(Toluene)-0.5685 (r=4497) for toluene. Synthetic leather factory workers expose to 3 kinds of organic solvents which are DMF, MEK and toluene. Their Uri-nary NMF and MEK levels were higher than their concentration levels through respiratory. It seems that the urinary levels were affected skin absorption for working habit and alcohol intake.

가토를 이용한 PYROST(Porous Hydroxyapatite)의 골 재생에 관한 실험적 연구

최응옥,정전은,최정호,김태연 大韓成形外科學會 1990 Archives of Plastic Surgery Vol.17 No.3

PYROST is a biocompatible porous matrix implantable as a bone graft substitute. This biomaterial has been used in a bariety of experimental settings over the past years and more recently has been used in clinical applications for the filling of bone defects. its use in human may help to eleminate the morbidity the morbidity of autogenous bone graft donor sites and resorption of autogenous bone graft. We studied the new bone regeneration within a PYROST block which were placed end to end in a subperiosteal pocket on the nasal dorsum of 1.8-2.0 kg New Zealand white rabbit. En block specimen were harvested at 4.8 and 12 weeks post onlay. These were then decalcified. imbedded and sectioned in the sagittal plane. For the confimation of bone regeneration within a PYROST we used weighing the PYROST and light microscope, point-counting technique and fluorescent microscope. The results obtained were summarized as follow : 1. There was no volume change of PYROST 2. The activation of osteoblasts and bone matrix were found of 4 weeks and matrix of lamellar pattern was found 12 weeks post onlay. 3. The quantity of the regenerated new bone within a PYROST was increased at 12 weeks (32 ±2.1%) than 4 weeks(15 ±1.8%).

선택적 레이저 소결법을 이용한 기어박스의 정밀주조기술 개발

최상련,김천기,박근,오철호 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.1

In this paper, rapid prototyping and precision castiong technology have been devloped for the manufacturing of inlet pear box of an airplane. Rapid prototyping is a new prototyping technology that produces complicated parts directly from threedimensional CAD data with a high efficiency, and has been extensively applied to various manufacturing processes. In the present work, Selective Laser Sintering(SLS) system is untilized in order to manufature prototype of the inlet gear box. Prototyping technology using SLS is also investigated from the viewpoint of accuracy. Using the SLS master, the casting products are manufactured through several processes such as: vacuum casting, lost wax shell casting and investment cast-ing. The shrinkage characteristics of wax and cast iron in the casting procedures are considered, and then reflected to the design procedure so that the accuracy of the product in improved consequently.

環境汚染物質의 許容基準値 決定에 對한 統計學的인 考察

崔春鎬 漢陽大學校 環境科學硏究所 1983 環境科學論文集 Vol.4 No.-

最近 環境汚染問題의 重大性에 따라 여러가지 汚染物質의 許容基準値 決定問題도 多角度로 考察되고 있다. 一般的으로 汚染物質의 測定値는 環境條件의 差異, 偶然的인 誤差等으로 이런 資料에 의하여 處理하는 데는 統計學과 密接한 關係가 있다. 그러나 統計學的인 側面에 대한 關心이 적고 處理方法의 開發 또한 不足한 實情이다. 따라서 이 論文에서는 汚染物質의 許容基準値決定에 測定値를 이용할 때 統計學을 應用하는 一部分을 考察한 것이다. In recent years, as the problems of environmental pollution are becoming increasingly more serious, many studies have been made on how to determine the allowable standard values of pollutants. On the whole, data on pollutants, when they are processend, have close connection with statistics because of differences in the conditions of the environment and eventual errors. But the reality of the matter is that little attention has been given to the statistical aspect of the problem. At the same time, there is much room for further development in the processing method also. Therefore this paper hopes to show how to apply statistics when using data to determine the allowable standard values of pollutants.

다발성 간종괴의 형태로 나타난 특발성 과호산구 증후군 치험1예

최승오,연규민,이승민,김순제,왕준호,박형석,이재동,진춘조,이창훈,신현준,김정은 건국대학교 의과학연구소 2004 건국의과학학술지 Vol.14 No.-

Hypereosinophilic syndrome is characterized by persistent blood eosinophilia of 1,500/ul or more in the absence of known causes and multiorgan dysfunction by eosinophil-related tissue damage. In Korea, some cases of hypereosinophilic syndrome with hepatic involvement have been described with prolonged benign clinical courses. Most of them were diffuse or multifocal lesions in imaging studies, and a few case presenting as a single mass has been described. Here we report a case of hypereosinophilic syndrome with hepatic involvement in a 65-year-old man who presented with multifocal mass lesions. By abdominal US and CT scan, multiple, ill-defined nodules were detected in throughout the liver. Liver biopsy revealed severe eosinophilic hepatitis, suggestive of hypereosinophilic syndrome. Hepatic mass lesions improved after steroid administration for several weeks.

활성탄관에 포집된 1,3-부타디엔의 탈착효율 개선에 관한 연구

최호춘,김강윤,정규철 한국산업위생학회 2002 한국산업보건학회지 Vol.12 No.1

This study was performed to improve the desorption efficiency and to measure storage stability for 1.3-butadiene collected on two activated charcoal tubes. This result will be used for measurement and evaluation of airborne 1,3-butadiene concentration for 1,3-butadiene exposed workers. The results were as follows: 1. Using carbon disulfide(CS_2) and methylene chloride(Mc) as desorbing solvents, the desorption efficiencies of 1,3-butadiene spiked on untreated activated charcoal tube(100㎎/50㎎) were 8.99±2.57% and 53.86±10.55%, respectively. 2. Using MC, chloroform, 1% butanol in CS2, 1% methanol(MeOH)in MC and 3% MeOH in MC, the desorption efficiencies of 1,3-butadiene spiked on untreated activated charcoal bube(400㎎, 200㎎, separately) were 66.50±8.65%, 40.07±2.46%, 47.97±3.91%, 85.91±1.64%, and 89.33±3.87%, respectively. 3. Using CS2, MC, MeOH/MC(1/99), MeOH/MC(3/97), and Butanol/CS2(1/99), the desorption efficiencies of 1,3-butadiene spiked on 4-tert-butylcatecho(TBC) treated activated charcoal tube(100㎎/50㎎) were 79.91±7.24%, 81.73±10.07%, 85.89±5.07%, 80.37±2.49% and 97.24±4.98%, respectively. 4. On untreated activated charcoal tube(400㎎ and 200㎎, separately) in freezer(-20℃), the recovery rates of storage stability were 79.53% after 1 week, 79.49% after 2 weeks, and 78.71% after 3 weeks. In refrigerator(≤4℃), the recovery rate of storage stability were 79.80 % after 1 week, 73.23% after 2 weeks and 74.31% after 3 weeks. 5. Coefficient o fvariation of 1,3-butadiene was 5.9, 1.03 and 5.12 using MeOH/MC(1/99), MeOH/MC(3/97), and Butanol/CS2(1/99) on TBC treated activated charcoal tube(100㎎/50㎎). 6. On TBC treated activated charcoal tube(100㎎/50㎎) in freezer(-20℃), the recovery rates of storage stability were 90.07% after 1 week, 81.42% after 2 weeks, and 80.37% after 3 weeks. In refrigerator(≤4℃), the recovery rates of storage stability were 73.29% after 1 week, 63.56% after 2 weeks, and 58.88% after 3 weeks. This study suggested that an optimum adsorbent and a desorbing solvent for 1,3-butadiene samples were TBC treated activated charcoal tube(100㎎/50㎎) and 1 % butanol in CS_2. For the storage stability, the samples should be stored in freezer(-20℃) and be analyzed within 1 week.