硬鋼線材의 高溫드로잉時 VOID 生性에 관한 硏究

南勝義,孫榮埈 弘益大學校 1986 弘大論叢 Vol.18 No.2

A study has been made of void formation by hot drawing at elevated temperatures. If a void were created in a hot drawing, the tensile strength and elongation of the high-strength wire rod will be diminish drastically, there fore a quality of the wire rod will be changed. In order to investigate the effect of spheroidized cementite on void initiation, a 0.68%C and 0.74%C high carbon steel wire rod were drawn, at 650℃ and 700℃. Metallographic observation have been carried out on voides associated with spheroidized cementite using a Scaning Electron Microcope. A principal mechanism of the void initiation is that the void nucleation is situated the on edge of spheroidized cementite by dislocation pile-up when the cementite particle is very hard and the matrix is soft. because elevated temperatures decrease the flow stress of Metal. Therefore, the void is created and brought up, at the interface of ferrite-cementite spheroidized when the hot Rod takes a tensile strength. The number of void and the volume percentage of cementite spheroized are crease proportionally to the amount of drawing reduction. The mechanical properties of hot drawing wire are caused by void initiation.

민간 체육시설 이용자의 만족도에 관한 연구

진중의,김진표,손영학 龍仁大學校 體育科學硏究所 2002 體育科學硏究論叢 Vol.12 No.1

The purpose of this study is on examining closely and precisely the correlations between the realities with using sporting centers and satisfaction of people using them. Firstly, in order to achieve that purpose, I have analyzed the differences in people's satisfaction that are caused by characteristics of the Population Statistics. Then I have studied about effects of realities on people using the sporting centers to the satisfaction. In this research, some health clubs in Teagu have been focused on the frame to be required. I picked 250 people randomly first but excluded 67 people who have been considered as being answered with insincerity or have been omitted due to insufficiency on the final questionnaire, which means finally 193 people were completely answered. This study includes totally 42 questions that are made up of 4 Population statistical questions about tools used as assessments, 3 questions about causes of the realities of sporting activities, and 35 questions about causes of the satisfaction rate by using some analyzing methodologies that are used, such as the frequency analytics, t-test, One way anova, scheffe's post-inspection, interrelationship analytics, regression analytics, and so on. Could get some meaningful results like following with using those methodologies mentioned before. Firstly, I could find out meaningful differences between different categories, amongst the Population Statistics characteristics in people using the sport centers, that were leader's ages, equipment satisfaction differentiated by the standards of education in the sporting programs, equipment satisfaction in the leader's different wages, and so on. Secondly, in the lower leveled realities causes, the equipment satisfaction has been revealed statistically around 5%(actually 8.1%) in frequency of participation whereas the programs have been indicated approximately 5%(actually 7.0%) in the term of participation.

山林의 公益的 機能 平價에 관한 考察

麻鎬燮,孫英模,金義庚,鄭永觀 慶尙大學校 1990 論文集 Vol.29 No.1

This study was carried out to estimate and evaluate the public function of forest resoruces, such as soil runoff control, landslide control, head-wsater conservation. purification of air (O? production and CO? purification ), sanitary andoutdoor recreation andwildlife protection for the forest land of 6.500.000 ha in Korea. The results obtaiend were as follows; 1 The function of soil runoff control was estimated to b e1.970million m?.its monetary value was appraised at 3.814.5 billion wons. 2.The function of landslide control was estimated to be 37.876 thousand m?its monetary value was appraised at 73.3 billion wons. 3. The function of head-water conservation was estimated to be 25.507million tons, its monetary value was appraised at 3.571.0 billion wons. 4.The production fo O? in the forest land was estimated to be 78.600 thousand tons,its monetary value was appraised at 3.930.0billion wons. 5.The volume of CO? absorbed in the forest land was estimated to be 94.320 thousand tons,its monetary value appraised at 2.204.3 billion wons. 6.The monetary value of outdoor recreation was appraised at 1.162.5 billion wons. 7.The phytoncide emmited in the forest land was estimated to be 1.954 thousand tons,the function of forest bath using phytoncide was appraised at 1.953.9 billion wons. 8.The monetary value of the functions of wildife protection, control of harmful insect control of tree growth and loss control of timber qality was appraised at 327 1 billion wons. In conclusion, the value of public functions of forest is more 23 times than that of the econmic function. production value of forest products, and comes to 14% of GNP. And also, the function of air purification.and and soil conservation has value than those of others. Particulary, it takes a more great deal of effort achiving the various works such as erosion control, establishment of recreation forest. management of reserved natural forest and afforestation of street tree for increasing of public functions.

자기 센서를 이용한 자율주행 차량의 경로인식 시스템

김명준,김의선,손석준,오승열,류영재,임영철 경북대학교 센서기술연구소 2002 센서技術學術大會論文集 Vol.13 No.1

無酸素性 運動能力과 生理學的 變因의 關聯性

김기진,윤성원,김학열,정정진,우도영,노성규,손태열,안의수 江原大學校附設 體育科學硏究所 1991 江原大學校附設體育科學硏究所論文集 Vol.- No.16

Wingate test 및 Supramaximal exercise를 이용한 무산소성 운동능력의 측정시 나타난 변인의 관련성을 살펴본 본 연구를 요약하면 다음과 같다. Wingate test시 혈중젖산농도 최고치는 9.04±0.62mM로서 Supramaximal exercise시 보다 유의하게 높았으며, 혈장 LDH 및 CPK활성도는 두가지 운동부하후 모두 유의한 변화는 나타나지 않았다. 근전도상의 적분치, 중간파형빈도 및 평균파형빈도도 유의한 변화는 없었다. 등속성 수축시의 최대토오크는 양쪽 다리 모두에서 초당 60도의 각속도에서가장 높았다. Wingate test시의 최대파워는 등속성 수축시 최대토오크 및 Wingate test시 중간파형빈도의 직접적인 영향을 받는 것으로 나타났으며, 평균파워는 Wingate test시의 적분치 변화, 듣는 쪽 슬관절의 등속성 수축시최대토오크 및 Supramaximal exercise시 혈장 LDH 활성도의 직접적인 영향을 받는 것으로 나타났다. 이상의 결과에서 무산소성 운동능력과 관련지어 그 기전을 살피고자 할 때 체내 화학적 변화, 전기생리적 변화 및 발현능력의 복합성을 고려해야 하며 최대누적 산소결핍량의 활용가능성은 측정강도 결정방법을 중심으로한 계속적인 연구가 요구된다. The present study examined the relationship of variables related to anaerobic capacity with Wingate test and supramaximal exercise. Peak value of blood lactate concentration with Wingate test showeda significantly higher than suprammaximal exercise, and plasma LDH & median power frequency and mean power frequency were not any difference between two tests. Peak torque of isokinetic contractionh on knee joint showed a highest value in 60 degrees of angular velocity among a various angular velocity. Peak power of Wingate test was related to peak torque of isokinetic contraction and median power frequency of EMG with Wingate test, and mean power of Wingate test was related to integrated EMG with Wingate test, peak torque with isokinetic contraction of dominant knee joint and plasma LDH activity with supramaximal exercise. In this result, when it analyzed the mechanism of anaerobic capacity, ti was required the consideration of complexity according to biochemical alteration, electrophysiological alteration and revelation of performance, Appicapability of maximal accumulated O₂deficit was demaned a continuous study with the focus of exercise intensity.

열공형과 비열공형 피질하 혈관성 치매에서 위험인자의 차이에 관한 비교 연구

배희준,정지향,유경호,나덕렬,김상윤,최경규,양동원,손의주,이상도,김재우,박경원,김응규,이재홍,박미영,한일우,함동석,최문성,하충건,최성혜,이애영,이병철,한설희 대한치매학회 2003 Dementia and Neurocognitive Disorders Vol.2 No.2

Backgrounds and Objectives: Vascular dementia is a group of dementing disoders arising from various stroke syndrome. Among these. subcortical ischemic vascular dementia (SIVD) is regarded as a relatively distinct clinical entity. However, MRI patterns of SIVD are not homogenous. In some patients, lacunes are dominant, and in others, subcortical white matter changes are. This study was designed to compare risk factor profiles between SIVD with and without multiple lacunes. Methods: We divided 47 subjects (22 males, mean age. 68 years) recruited from VADAPET (Multicenter Trial For Evaluation Of The Changes In the PET Images Of Subcortical Vascular Dementia Patient) study into two groups one with more than 5 lacunes in deep gray matter (lacune group) and the other with 5 or less(non-lacune group) Clinical characteristics and laboratory findings of two groups were compared. Results: Nineteen of 47 patients (40%) belonged to the lacune group. The lacune and non-lacune groups d d not differ in the following variables: age, hypertension, diabetes mellitus, hyperlipidemia heart disease, history of stroke or TIA, history of trauma or major surgery, family history of hypertension stroke, or dementia, age at diagnosis of dementia, body mass index, white blood cell count, ESR, CRP, fibrinogen, hemoglobin A1C, total cholesterol. LDL cholesterol creatinine, proteinuria, glucosuria, and microhematuria. However, male sex, smoking alcohol. hemoglobin, and HDL cholesterol were possibly associated more with lacune group SIVD than with non-lacune group (p<0 1) Multivariate analyses revealed that smoking, hemoglobin, and HDL cholesterol were independent predictors of SIVD with multiple lacunes Conclusion: Our study suggests that SIVD with multiple lacunes may be significantly different in smoking habits hemoglobin, and HDL cholesterol from SIVD without multiple lacunes.

서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)

김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1

In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.

열처리한 자가혈청이 성인 골수간엽줄기세포의 증식과 조골세포 분화에 미치는 영향

박의균 ( Eui Kyun Park ),이선영 ( Sun Young Lee ),김태호 ( Tae Ho Kim ),정필훈 ( Phil Hoon Choung ),강길선 ( Gil Son Khang ),손영숙 ( Young Sook Son ),김석영 ( Suk Young Kim ),김신윤 ( Shin Yoon Kim ) 한국조직공학과 재생의학회 2005 조직공학과 재생의학 Vol.2 No.1

Tissue engineering using mesenchymal stem cells (MSCs) is a promising technology for treatment or regeneration of tissue defects. However, to put this technology into practical use, it is necessary to determine suitable biomaterials as well as to expand MSCs ex vivo. One major challenge of ex vivo expansion of MSCs is to avoid the use of fetal bovine serum (FBS), which is a fundamental culture supplement. In this study, we investigated effects of autologous serum on proliferation and osteoblastic differentiation of bone marrow stem cells (BMSCs) isolated from patients with skeletal diseases. We isolated BMSCs from 7 independent patients with avasular necrosis (AVN; 3 cases), osteoarthritis (OA; 2 cases), femoral head fracture (1 case) or hip dysplasia (1 case) and compared the effects of FBS, heat inactivated (HAS) and normal autologous serum (HA) on the proliferation of BMSCs. Proliferation analyses of BMSCs revealed that 5 out of 7 BMSCs cultured in 10 % HAS showed higher proliferation than cells cultured in 10 % FBS. Moreover, analysis of osteoblastic differentiation as assessed by alkaline phosphatase (ALP) staining, a marker for osteoblastic differentiation, showed that HAS, AS and FBS were capable of supporting osteoblastic differentiation of BMSCs at the similar level. Interestingly, mineralization was increased in BMSCs cultured in HAS (5 out of 6 BMSCs). These results demonstrate that HAS compared with conventional FBS has a better potential to stimulate proliferation and mineralization of BMSCs as well as to support their osteoblastic differentiation.

장기분지 시추코어(JG-1, 2)의 구조요소 분석결과

손의영(Eui-Young Son),김민철(Min-Cheol Kim),하상민(Sang-Min Ha),손문(Moon Son) 대한지질학회 2014 대한지질학회 학술대회 Vol.2014 No.10

한반도 남동부 지역 신령단층과 오천단층 단층점토의 마찰 특성

손의영(Eui-Young Son),이희권(Hikweon Lee),우상우(Sangwoo Woo),손문(Moon Son) 대한지질학회 2017 대한지질학회 학술대회 Vol.2017 No.10