술폰화 폴리스티렌-디비닐벤젠 혼성중합막을 통한 알칼리 금속이온의 전달특성에 관한 연구

선용호,조영일,한정우 연세대학교 산업기술연구소 1991 논문집 Vol.23 No.1

The transport characteristics of alkali metal ions, ?? and ??, through a cation exchange membrane was investigated. The membrane used in this experiment was ?? type sulfonated polystyrene-co-divinylbenzene membrane (K-102, Asahi Kasei Co.). The initial flux of the ion was increased with the increase of both ?? ion concentration and temperature. In this experimental range (pH 0.5∼3.0, temperature 15∼60℃), the initial flux of ?? was found to be from ?? to ?? and that of ?? from ??, ??. The membrane was selective for ?? and the flux ratio of ?? to ?? was about 1.10.

SHS법으로 TiAl 금속간 화합물의 제조시 첨가원소에 따른 기계적 성질에 관한 연구

宣炅杓,李龍鎬 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.2

TiAl intermetallic compounds are very attractive for high temperature structural applications because of their high specific strength, high temperature oxidation resistance, and superior creep characteristics. In this study, processing of TiAl using self-propagating high temperature synthesis was investigated. The effects of processing varibles including holding temperature and pressure, and alloying element on the microstructure, mechanical properties of TiAl were studied. It was demonstrated that the SHS process could yield TiAls with properties comparable with those of TiAl produced via the ingot metallurgy route.

충전탑형 무산소/호기 공정에서 반송비에 따른 유기물 및 질소 제거 특성

선용호 한국환경과학회 2002 한국환경과학회지 Vol.11 No.12

This study was focused on the investigation of the characteristics of organics and nitrogen removal with the recycle ratio in anoxic/oxic(A/O) packed bed process that consisted of the anoxic reactor and the aerobic reactor. As increasing the recycle ratio by 0.5, 1.0, 2.0, the COD removal efficiency increased by 94.0%, 98.5%, 98.8% respectively. The aerobic reactor showed the perfect nitrification efficiency by 98.5% 99.2%, 98.0% respectively. the T-N removal efficiency with the recycle ratio, increased by 56%, 67%, 70% respectively. As increasing the recycle ratio by 0.5, 1.0, 2.0, T-P removal efficiency decreased by 62.1%, 57.4%, 51.3% respectively. The process by releasing the stored phosphours in the anoxic reactor and uptaking the excess phosphours in the aerobic reactor, occurred well comparatively when recycle ratio is 0.5. But this process did not occur when the recycle ratio is 1.0 and 2.0. And optimum pH of nitrification was about 6~7 and alkalinity decreased as nitrification rate increased. As increasing the recycle ratio in the anoxic reactor, DO concentration and ORP increased.

一部 銀行員들의 疲勞度 自覺症狀에 關한 調査硏究

鄭成浩,鄭善太,洪大容 慶尙大學校 1985 論文集 Vol.24 No.1

A survey was carried out on subjective symptoms of fatigue of 132 bank clerks (male 77, female 75) in Chin-ju city in order to measure the degree of fatigue caused by wory by questionaire form. The data were analyzed by sex, age and years employed. The results obtained are summarized as follows : 1. General char acteristics of respondents are as follows: For male, the majority was (distributed from the early twenty to late thirty, but for female, early twenty, As for the years employed, 5 years-mor egroup for male and 3-4 years group for female were found to be the majorty. 2. As for the composition of subjective symptoms, there were found I (physical) >Ⅱ (mental) > Ⅲ (neurosensory) type in male, while I>Ⅱ>Ⅲ type in female at both before and aftre work. 3. The lowest percent of complaints were found in25-29 age group for male and 20-24 age group for female . 4. The lowest percent of complaints were found in 3-4 years employed group for male and 1-B years employed group for female. 5. The signifcant correlationships between before and after work were found in physical symptoms for male(P<0.05), while in mental (p<0.01) and neurosensory symptoms(pc<0.05) for female.

아동의 눈-사지 협응과 물체조작 기술의 관계

김선진,한동욱,박승하,김용호 한국스포츠심리학회 2003 한국스포츠심리학회지 Vol.14 No.2

본 연구의 목적은 아동의 눈-사지 협응 능력과 물체조작 기술의 차이를 알아보고, 두 변인군의 관계를 구명하는 데 있다. 피험자는 남?여 5-10세의 아동 186명을 대상으로 하였다. 눈-사지 협응 능력은 예측 타이밍 능력, 추적 능력, 전신 반응 능력을 측정하여 분석하였으며, 물체조작 기술은 TGMD(Test of Gross Motor Development)에서 제시한 받기, 던지기, 치기, 차기, 튀기기 기술을 평가하였다. 먼저 눈-사지 협응 능력과 물체조작 기술의 연령과 성별에 따른 특성을 알아보기 위해 이원 변량분석을 실시한 결과, 5세의 아동 집단은 전반적으로 수행능력이 6세, 7세, 8세, 9세, 10세의 아동에 비하여 수행능력이 떨어졌으며, 10세의 아동은 다른 연령 집단에 비하여 우수한 수행능력을 나타냈다. 이러한 결과는 5-6세, 9-10세의 연령 시기가 눈-사지 협응 능력과 물체조작 기술이 변화되는 시기임을 나타내주고 있으며 이는 연령에 따른 특징을 보여주는 것이다. 다만 눈-사지 협응 능력과 다르게 물체조작 기술에 있어서는 성별에 따른 수행 능력이 9세와 10세의 연령 집단에 있어서 상반된 특징이 나타났다. 즉 남자 아이들의 경우, 9세의 연령 집단과 비교하여 10세의 연령 집단은 물체조작 기술의 수행 능력이 급격하게 증가한 반면에 여자 아이들은 수행 능력이 떨어지는 특징을 보였다. 또한 눈-사지 협응과 물체 조작 기술간의 관계를 알아보기 위해 정준 상관분석을 실시한 결과, 두 과제간 상관계수 .599로 통계적으로 유의한 상관관계를 보였다. 이러한 결과를 바탕으로 눈-사지 협응 능력과 물체조작 기술의 관계를 설명해 주는 각 변인들의 상대적 기여도를 살펴보면, 눈-사지 협응 능력에서 손과 발을 사용한 예측 타이밍 능력이 추적 및 전신 반응 능력보다 높은 기여도를 보였다. 또한 물체조작 기술에 있어서는 받기와 튀기기 능력이 눈-사지 협응 능력과 물체조작 기술의 상관관계를 설명하는데 많은 기여를 하는 것으로 나타났다. The purpose of this study was to investigate the difference of eye-limb coordination and the object-control skills with age and sex, and examine the relationship between two-variable groups. For this experiment, 186 children with the age of 5 to 10(99 boys and 87 girls) participated in the study. The eye-limb coordination ability(anticipation timing ability, pursuit ability and reaction ability) and the object-control skill(catching skill, throwing skill, striking skill, kicking skill, bouncing skill) suggested in TGMD(Test of Gross Motor Development)were tested. The two-way ANOVA was used to present the characteristics of the eye-limb coordination ability and the object-control skills according to age and sex. As a result, children with the age of 5 demonstrated the lowest performance while children with the age of 10 showed high performance significantly among age groups. The children with the age of 5 to 6 and 9 to 10 were found to be two critical periods of change with age. However, unlike the eye-limb coordination ability, there was a distinctive feature in the object-control skills of the age 9 and 10 over sex. 10 year-old boys showed a radical progress, but the 10 year-old girls showed a decline on the object-control skills compared with the 9 year-old. A canonical correlation analysis was used to examie the relationship between the eye-limb coordination and the object-control skills for the early childhood. The relationship revealed significantly showing canonical correlation with coefficient .599. Overall, the results indicated the eye-limb coordination ability such as anticipation timing ability with hand and foot showed higher role than pursuit and reaction ability. In addition, the object control skills such as catching and bouncing ability contributed importantly in explaining the relationship between the eye-limb coordination ability and the object control skill.

Antioxidant and hepatoprotective effects of Korean ginseng extract GS-KG9 in a D-galactosamine-induced liver damage animal model

Yun Ho Jo,Hwan Lee,Myeong Hwan Oh,Gyeong Hee Lee,You Jin Lee,Ji Sun Lee,Min Jung Kim,Won Yong Kim,Jin Seong Kim,Dae Seok Yoo,Sang Won Cho,Seon Woo Cha,Mi Kyung Pyo 한국영양학회 2020 Nutrition Research and Practice Vol.14 No.4

BACKGROUND/OBJECTIVES: This study was designed to investigate the improvement effect of white ginseng extract (GS-KG9) on D-galactosamine (Ga1N)-induced oxidative stress and liver injury. SUBJECTS/METHODS: Sixty Sprague-Dawley rats were divided into 6 groups. Rats were orally administrated with GS-KG9 (300, 500, or 700 mg/kg) or silymarin (25 mg/kg) for 2 weeks. The rats of the GS-KG9- and silymarin-treated groups and a control group were then intraperitoneally injected Ga1N at a concentration of 650 mg/kg for 4 days. To investigate the protective effect of GS-KG9 against GalN-induced liver injury, blood liver function indicators, anti-oxidative stress indicators, and histopathological features were analyzed. RESULTS: Serum biochemical analysis indicated that GS-KG9 ameliorated the elevation of aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), and lactate dehydrogenase (LDH) in GalN-treated rats. The hepatoprotective effects of GS-KG9 involved enhancing components of the hepatic antioxidant defense system, including glutathione, glutathione peroxidase (GPx), superoxide dismutase (SOD), and catalase (CAT). In addition, GS-KG9 treatment inhibited reactive oxygen species (ROS) production induced by GalN treatment in hepatocytes and significantly increased the expression levels of nuclear factor erythroid-2-related factor 2 (Nrf2) and heme oxygenase-1 (HO-1) proteins, which are antioxidant proteins. In particular, by histological analyses bases on hematoxylin and eosin, Masson"s trichrome, α-smooth muscle actin, and transforming growth factor-β1 staining, we determined that the administration of 500 mg/kg GS-KG9 inhibited hepatic inflammation and fibrosis due to the excessive accumulation of collagen. CONCLUSIONS: These findings demonstrate that GS-KG9 improves GalN-induced liver inflammation, necrosis, and fibrosis by attenuating oxidative stress. Therefore, GS-KG9 may be considered a useful candidate in the development of a natural preventive agent against liver injury.

Computer Simulation을 이용한 Skier의 滑降 模形開發에 관한 力學的 考察

鄭成浩,鄭善太,金龍男 公州大學校스포츠科學硏究所 1989 스포츠科學硏究所論文集 Vol.- No.3

As result of computing the speed just before jump, it was 22.6 m/s in the vacuum, 21.6 m/s in the groundfriction, 20.2 m/s in the air resistance and ground friction, in application of the dynamic theory. The difference of the speed, if little, was 1.0-2.4 m/s and the frying distance was 6.6-30 m through compuer simulation. In the step of jump, the vertical speed of jumper was found to be "V_t = 2h/t" by using the model of spring, the frying distance, in the case of "t = 0.12s" (i. e. the flying elevation of 5), was 25m longer, than in 't = 0.21s', and in order to increase the effect of jump. The result of simulation on four kinds of model poses in Fig-5 proved that the pose of d type is the most efficient.

3차 병원의 병동에서 시행된 심폐소생술의 분석

류진호,정경운,위준선,문정미,전병조,문원식,김용권,소정일,허탁,민용일 대한응급의학회 2001 대한응급의학회지 Vol.12 No.4

Background: Although cardiopulmonary resuscitation(CPR) is a very effective therapy in cardiac arrest, it is hard to prove the true effectiveness of CPR. Several studies about out-of-hospital and emergency department CPR exist, but only a few reports about in-hospital CPR are available. This study was designed to investigate in-hospital cardiac arrest, to analyze the result of CPR, and to evaluate the problems associated with in-hospital CPR. Methods: A clinical analysis of 71 cases of in-hospital CPR announcement from January 2000 to August 2000 was performed. The initial rhythm on cardiac arrest, return of spontaneous circulation(ROSC), and the survivals were analyzed in the case of the 46 true cardiac arrest patients. Results: During 8 months, there were 71 cases of in-hospital CPR announcement. Among them, there were 46 cases of true cardiac arrest and 25 cases of non-cardiac arrest. Of the 46 true cardiac-arrest cases, 27(58.7%) experienced ROSC, 15(32.6) survived for over 24 hours, and 7(15.2%) survived to be discharged. The initial rhythms on cardiac arrest were 30 cases(65.2%) of asystole, 14(30.4%) of PEA(pulseless electrical activity), and 2(4.3%) of ventricular fibrillation, with ROSC being 17 cases(56.7%), 9(64.3%) and 1(50.0%) cases and discharged survivors being 4 cases(13.3%), 3(21.4%) and 0(0.0%) cases, respectively. Conclusion: Extraordinarily high proportions of asystole and PEA were seen in the initial rhythm of cardiac arrest, and those were associated with high survival rates. Although further study is needed to evaluate the course leading to this high proportion of asystole and PEA, this result suggests that if the EMS system in the hospital is activated promptly and systematically, a better outcome will be achieved in case of cardiac arrest with asystole and PEA.

化學펄프 製造에 微生物의 應用 可能性

李宣鎬,尹炳虎,李元用 江原大學校 森林科學硏究所 1997 Journal of Forest Science Vol.13 No.-

要 約 백색부후균인 Fomes pini (Thore) Lloyd에 의해 처리된 chip을 anthraquinone(AQ)을 첨가하여 화학 펄프화를 실시하여 얻은 결과를 미처리재의 것과 비교하였다. 균처리함에 의해 카파값 20에서의 H factor는 소다와 크라프트 증해에서 각각 17%와 15%가 감소되었다. 이러한 결과는 목재를 백색부후균으로 처리함으로 인해 탈리그닌이 용이해졌음을 나타내는 것이다. 비페놀성 β-0-4 화합물인 veratrylglycerol-β-guaiacyl ether(I)와 페놀성 β-0-4 화합물인 syringylglycerol-β-syringyl ether(III)에 백색부후균을 작용시키면 반응생물로서 각각 α-guaiacoxy-β -hydroxypropioveratrone(II)과 α-syringyloxy- β -hydroxypropiosyringone (IV)이 생성됨이 밝혀겼다. 따라서 목재에 균처리를 함으로서 카르보닐기가 리그넌의 측쇄 α위에 도입되어 그로 인해 탈리그닌이 용이하게 된 것으로 여겨진다. ABSTRACT The decayed wood by Fomes pini (Thore) Lloyd required a smaller H factor than the sound wood for pulping to permanganate number 20. The H factors for the wood pulping by the kraft and soda processes were reduced by 15% and 17%. respectively. in the presence of 1% anthraquinone. The wood components degraded by fungi are normally more readily solubilized in alkali than the corresponding components in sound wood. The nonphenolic β-0-4 type lignin model compound. veratrylglycerol-β-guaiacyl ether(I), and phenolic model compound, syringlglycerol-β-syringyl ether(III). were degraded by the white-rot fungi to yield α-guaiacoxy-β-hydroxypropioveratrone(II) from the former and α-syringyloxy-β-hydroxypropiosyringone(IV) from the latter. Structures of the degradation products indicated that C r-oxidation could occur with wilite-rot fungi. It has been shown that the alkaline cleavage of β -aryl ether bonds in the lignin units is accelerated by the presence of α-carbonyl groups.

장거리 달리기 선수에서 횡문근융해와 생화학적 지표의 변화에 대한 연구

안선호,최석채,김태현,나용호,송주흥,이영진,조지현,최석준 대한신장학회 2000 대한신장학회잡지 Vol.19 No.5