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.

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.

NDE 및 생체자기 계측을 위한 SQUID 응용

박용기,김인선,이용호,권혁찬,김진목,김기웅 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1

SQUID is the most sensitive magnetic sensor known. It is able to detect the magnetic field as small as few femto Tesla (fT), which is equivalent to one of 10 billionth of earth magnetic field (about 50 ??T). SQUID can be applied in the various fields and its need will be increased greatly in the future. If SQUID is applied in the medical technology, there will be improvement in accurate diagnosis of brain and heart by supplying more information about the functions of such human organs. The nondestructive evaluation (NDE) of deep-lying flaws in the inner layer of lab jointed structures of aircraft, which is very difficult with the existing method became possible using high T_c SQUID. In this paper, the current status of SQUID applications in both medical and NDE fields will be reviewed.

Rieger 증후군의 증례

김선희,양규호,김용남 大韓小兒齒科學會 1988 大韓小兒齒科學會誌 Vol.15 No.1

The major manifestations of Rieger's syndrome are ocular and dental abnormalities. The ocular abnorma-lities include partial or complete hypoplasia of the iris stroma, the presence of iris strands crossing the angle of the anterior chamber of the eye, and the presence of posterior embryotoxon. Hypodontia, microdontia, peg shaped teeth, and malocclusion (bilateral cross-bites) are common oral findings. Hypoplasia of the maxilla causes the mandible to appear prominent. The authors observed a patient with Rieger's syndrome who was a 13year-old girl. With reserach of literature, the case is presented.

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.

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.

신체형 환자의 애착 특성

김용희,송지영,반건호,김종우,신용선 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.6

Objectives : The purpose of this study was to evaluate the relationship betseen attachment style and somatization in patients with somatoform disorder. Methods : Data was collected by self-report questionnaires. 134 normal subjects and 30 patients with somatoform disorder were enrolled in this study. All subjects completed a psychometric assessment that consisted the Revised Adults Attachment Scale(RAAS), Inventory of Parent and Peer Attachment (IPPA), Sungshin Self-concept Inventory (SSCI), and SCL-90-R. Results : 1) Somatoform patients showed more anxious attachment style than normal control. 2) Anxious attachments were combined with mistrust of their parents, emotional instability, and interpersonal mistrust which may play a significant portion of variance in somatization. Conclusion : We found that patients with somatoform disorder had more anxious attachment style than normal subjects. Insecure attachment patterns may significantly explain the phenomenon of somatization.

분리된 뇌조직의 수초화세포에 관한 연구

고선용,안의태,양남길,고정식,박경호 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.2

중추신경계통의 신경세포들은 긴 축삭돌기로서 다른 신경세포와 연접을 이루기 때문에 뇌손상시 나타나는 반응도 신경로의 방향과 관계가 깊다. 대부분의 긴 축삭은 수초집으로 둘러싸여 보호를 받고 있고 또 수초는 축삭의 대사활동에 중요한 기능을 발휘한다. 뇌가 손상받아 축삭들이 절단될 때 퇴행되는 축삭을 둘러싼 수초집의 다양한 변화는 손상부위의 괴사과정, 치유과정 및 부분적 재생기능에 중요한 요소가 된다. 본 실험에서는 뇌속에 주위의 다른 신경세포와 의 연결이 단절된 뇌조직의 기둥을 만들고 그속에서 일어나는 형태학적 반응 가운데서 특히 수초구조물의 특수한 반응을 연구하였다. 3Kg 정도의 고양이를 nembutal로 마취시키고 뇌정위고정대에 고정시킨 다음 전두골의 일부를 절개한 후 직경 5mm 크기의 원통형칼날을 내려 눌러서 뇌조직의 기둥이 주변으로 부터 분리되도록 했다. 이때 부위선택은 뇌지도를 이용하여 중간줄무늬체동맥이 아래로 부터 올라오는 것이 손상되지 않도록 해서, 분리된 뇌조직이 계속하여 혈액공급을 받을 수 있도록 하였다. 3~4주동안 생존 시킨 후 1% glutaraldehyde 와 1% paraformaldehyde 용액으로 뇌를 고정시켰고 일반적인 술식으로 표본을 작성하여 전자현미경으로 관찰하였다. 관찰 결과 손상된 줄무늬체기저핵 안에서는 많은 수초구주물들이 불규칙한 모습을 지녔으며, 특히 수초집이 팽되되고 심하게 쭈그러드는 것들이 많았으나 이때도 수초의 기본구조는 흐트러지지 않고 정상에 가까운 것이 많았다. 이는 비록 절단된 축삭이 괴사하여 소멸되더라도, 이를 둘러싼 수초집을 만들고 유지해 온 희돌기아교세포가 건재하기 때문에 아직도 기본구조를 유지한 것으로 생각되었다. 특히 전체적인 모양 심하게 변하는 것은 희돌기아교세포가 오히려 활성화되어 새로운 변형을 시도하는 것으로 생각되며, 그 대표적인 예로서 여유분의 수초집이 신경종말을 비롯한 다른 구조물을 흡인하거나 둘러싸는 현상을 보였다. 가장 특이한 경우로는 거대화된 수초집 속에 상당수의 세포들이 들어 있는 수초화세포의 출현이었다. 이들 세포의 성분을 확정하기는 어려우나 형태학적 특징과 세포의 이동특성, 포식형태등으로 볼때 이 세포들이 별아교세포 성분인 것으로 판단하였다. 이와 같은 별아교세포의 수초화는 이 세포들이 손상받은 뇌조직이 치유과정에서 수초집 안팎의 섬유화를 유도하고, 새로이 재생되려는 축삭의 자라나갈 자리를 차지하므로써 손상된 축삭의 재생을 막는 원인이 될 수 있다고 결론지었다. Since the neurones in the central nervous system make contact with other neurones through their long axons, the tissue reactions following brain damage are complicate, and the reactions appear largely along the course of transected axons. Myelin sheaths around transected axons have to show curious reactions. because they belong to oligodendroglia instead of belong to component. In this experiment, a tissue column of fundus striati nucleus was made by pressing a tube-knife of 5 mm diameter down toward the basal forebrain area, where the middle striatal arteries penetrate the brain. Three to four weeks after the stereotaxic isolation, tissue blocks are punched out from fundus striati nucleus. Ultrathin sections are obtained through the observations are discussed and the following results are obtained. Many axons and their myelin sheaths showed various transformations, including the redundant myelin sheaths and myelinated cells. Many redundant myelin sheaths are wrapped around, or sucked in the axon terminals or other structures. Redundant myelin sheath should be very active structures, even after the degeneration of axon within it, since the myelin sheath is a component of oligodendroglia instead of axonal component. Myelinated cells, the cells dwelled within some giant-swelled myelin sheaths, are observed. They contained relatively light cytoplasm with scanty cell other cell components or axon terminals, within the giant myelin capsule. The structural characteristics and the moldability into the myelin sheath, of these myelinated cells suggested that they are activated astroglial cells. Astroglial activities within or out of the transected myelin may prohibit the new axonal sprouts growing into the myelin sheath during regeneration course of nerve fiber in the central nervous system.