Simultaneously rapid synthesis and consolidation of nanostructured Mg0.3Al1.4Ti1.3O5 by high-frequency induction heating

Kang, H. S.,Du, S. L.,Doh, J. M.,Yoon, J. K.,Shon, I. J. SPRINGER SCIENCE AND BUSINESS MEDIA 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.3

A one-step synthesis and consolidation of nanostructured Mg0.3Al1.4Ti1.3O5 was achieved by high-frequency induction heating, using the stoichometric mixture of MgO, Al2O3 and TiO2 powders. Before sintering, the powder mixture was high-energy ball milled for 10 h. From the milled powder mixture, a highly dense nanostructured Mg0.3Al1.4Ti1.3O5 compound could be obtained within one minute, under the simultaneous application of 80 MPa pressure and an induced current. The advantage of this process is that it allows an instant densification to the near theoretical density, while sustaining the nanosized microstructure of raw powders. The sintering behavior, microstructure and mechanical properties of Mg0.3Al1.4Ti1.3O5 compound were evaluated.

Wangensteen Suction의 신경외과적 이용 : Thechnical note

김수휴,도종웅,김상철,심재홍,정상섭,이헌재 대한신경외과학회 1975 Journal of Korean neurosurgical society Vol.4 No.1

There is a constant need for negative baric pressure suction apparatus in neurosurgical practice. This drainge unit should be able to drain fluid into a sterile and closed reservior. We have studied a technique employing the Wangensteen suction apparatus for postoperative drainage in craniotomy patients, particularly patients with subdural hematomas and patients having possibility of subgaleal hematomas. The advantages of this technique are; 1) Local postoperative complications such as hematoma, secondary infections and skin flap necrosis are reduced. 2) This technique leads to decrease in healing time. 3) Bulky bandages and redressing can be avoided. 4) It is a simple, economic and readily available technique. 5) The study of the suctions inside the transparent tubes gives good informations about the local situation in the wound.

한국 최초의 경주시 황남동 출토 유리 용융 도가니 및 유리 구슬에 대한 연구

최주,안재호,황상주,권희경,김수철,도정만,박기훈,김선태 한국전통과학기술학회 1994 한국전통과학기술학회지 Vol.1 No.1

A piece of glass melting crucible whose inner face was lined with yellowish brown glass, a yellowish brown ellipsoidal bead and a greenish scrcew-shaped wound bead were unearthed in Kyongju city. These finds were dated to around the middle of the 6th century by pattern impressed earthenwares excavated in the same stratum. Chcmica analyses were carried out by means of energy diapersive spectrometry(EDS), atomic absorption analysis(AA), induced coupling plasma analysis(ICP) along with conventional wet analvsis. Also X-ray and elecrtron diffraction analvses were periomd in an attempt to identify any crystalline precipitates. Three glass items are classified iota lead-silica group showing the same compositions. This indicates that the two beads are from the same crucible. Ywllowish brown glass film contains 72.5% PbO and 25.2% SiO₂ and its softening point is 442℃ which is determined by differential scanning calorimeter(DSC). Melting point is found to be around 650℃ by practical measurement. Color differences in two beads are proved to be mainly due to copper contained in the glass, i.e., yellowish brown and greenish colors depend on reduction and oxidation atmosphere during melting, respectively. Chemical analysis shows that the glass melting crucible is a common earthenware.

LiF:Mg,Cu,Na,Si의 열발광 피크 분석

남영미,정운혁,이대원,도시홍,이종환,김기동 동의대학교 기초과학연구소 1998 基礎科學硏究論文集 Vol.8 No.1

Five different methods were used to determine the trap depth E, the frequency factor s, and the kinetic order associated with the glow peaks in a LiF:Mg, Cu, Na, Si phosphor, which had been newly developed indigenously. The methods used were the initial-rise method, the total glow-peak method, the peak-shaped method, the variable heating-rate method, and the isothermal decay method. The peaks obeyed simple first-order kinetics following the model of Randal and Wilkins. The values of the trap depth E determined for peaks 1 to 4 were 0.69∼0.95, 0.71∼1.17, 1.77∼1.95 and 0.66∼1.22 eV with frequency-factor, s, values of 10^8∼10^11, 10^9∼10^11, 10^19∼10^20 and 10^8∼10^10 s^-1, respectively.

단파를 이용한 Clonic Facial Spasm 치험 1예

도종웅,박종운,김상철,정상섭,이규창,이헌재 대한신경외과학회 1975 Journal of Korean neurosurgical society Vol.4 No.2

Clonic facial spasm had attracted for attention of neurosurgeons for a long time. However the optimal way of treatment is not established yet. In this report, we are describing a case of clonic facial spasm treated by making a lesion on the facial nerve at stylomastoid foramen with radiofrequency lesion generator which has been applied for percutaneous cordotmy or percutaneous gasserian ganglionotomy.

Temopral Lobe Agenesis Syndrome

도중웅,김영수,이규창,한윤선,이헌재 대한신경외과학회 1977 Journal of Korean neurosurgical society Vol.6 No.1

The temporal lobe agenesis syndrome is the expansion of the bony boundaries of the middle cranial fossa and a deficiency of the temporal lobe with arachnoid cyst. We have seen three unusual cases of the temporal lobe agenesis syndromes. All of the arachnoid cysts in our series behaved as intracranial masses, were associated with some minor neurological deficits and were diagnosed as brain tumor and chronic subdural hematoma preoperatively. In our series, two patients, showed paradoxical changes of the adjoing bony structure of the skull. There was a widening of the middle fossa, elevation of the lesser wing of the sphenoid and thinning of the themporal bone. The carotid angiograms showed the upward and medial displacement of the middle cerebral artery with avascular temporal region and the missing and abnormal course of the middle cerebral vein. We have discussed the pathogenesis of the arachnoid cyst. The osteoplastic craniotomy with removal of arachnoid cyst and opening the passage with the subarachnoid space in the region of the basal cisterns seems effective.

교사 폭력과 남자중학생의 학교생활의 질 및 자아존중감 간의 관계

도현심,신정님 이화여자대학교 교과교육연구소 1999 교과교육학연구 Vol.3 No.1

본 연구의 목적은 교사의 신체적 · 언어적 폭력의 실태와 교사의 이런 폭력과 청소년들의 학교생활 태도 및 자아존중감간의 관계를 살펴보는 것이다. 또 이와 더불어 학교생활태도와 자아존중감의 관계를 살펴보았다. 본 연구는 Straus(1979)가 고안한 CTS(Conflict Tactics Scale)를 개정 · 수정한 폭력 척도, Epstein과 Mcpariland(1978)가 제작한 학교생활척도(Quality of School life) , Harter(1981)의 자아존중감 척도를 근거로 제작된 설문지들을 이용하여 중학교 2학년 남학생 369명을 대상으로 조사되었다. 주요 연구결과를 요약하면 다음과 같다. 첫째, 교사의 신체적 폭력을 경험한 청소년은 조사대상자의 약 80정도 였고, 주된 신체적 폭력 행사 방법으로는 교사의 손(주먹)을 이용하여 맞은 경험이 제일 빈번한 것으로 나타났다. 언어적 폭력의 경우는 전체의 약 30%정도가 경험한 것으로 나타났다. 둘째, 교사의 폭력과 청소년들의 학교생활태도는 유의한 관계를 보였다. 교사로부터 신체적 · 언어적 폭력의 경험이 많은 청소년일수록, 학교생활태도 중 교사와의 관계가 나빴고, 수업에서의 참여도가 낮게 나타났다. 그러나 교우와의 관계는 아무 관련이 없었다. 셋째, 교사의 폭력과 청소년들의 자아존중감은 자아존중감의 하위요인중, 행동 · 품행요인과 사회적 수용요인만 유의한 관계를 보였다. 즉, 교사의 신체적 언어적 · 폭력 경험이 많을수록 청소년의 행동 · 품행과 관련한 자존감은 낮았고, 반대로 사회적 수용에 관련한 자존감은 높게 나타났다. 자존감의 요인 중 그 외의 요인들은 유의적인 관계를 나타내지 않았다. 넷째, 학교생활태도와 자아존중감은 서로 유의한 관계를 보였다. 학교생활태도중 교우관계와 교사관계 그리고 수업참여도가 높을수록 청소년의 자아존중감은 높게 나타났다. 본 연구는 현재 우리나라 청소년들이 학교생활에서 교사로부터 일반적으로 경험하고 있는 교사폭력의 실태와 이런 폭력의 경험과 학교생활태도 및 발달(자아존중감)간의 관계를 밝힌 점에 의의가 있다. 본 연구결과를 통과 교사의 신체적 · 언어적 폭력의 실태와 학교생활태도와 자아존중감간의 관계를 밝힘으로써 청소년의 학교생활에서 교사 역할의 중요성에 대해 시사한다고 하겠다. The purposes of this study was to examine teachers' violence trends and the relations between teachers' violence and the quality of school life and self-esteem in adolescents. The relations between the quality of school life and self-esteem were also examined. The study was studied with a sample of 369 2nd grade middle school students living in Seoul, using the teachers' violence questionnaire developed by the author hased on Straus (1979), the Quality of school life questionnaire(Epsteion & Mcpartland, 1976), and a self-perception profile(Harter, 1983). The main results of the study were as follows. First, over 70% of the adolescent were physically punished, and over 30% of adolescents were verbally punished. And mainly teachers punished their student using their fist. Second, teachers' violence were significantly related to the quality of school life in adolescent boys. The more teachers' violence they experienced, the more negative reactions to teachers and the less commitment to classwork they have. But teachers' violence was not significantly associated with relations to friend. Third, teachers' violence were significantly associated with Behavioral Conduct and Social Acceptance in self-esteem. The more teachers' violence they experienced, the lower self-esteem on Behavioral Conduct they have. On the contrary, The more teachers' violence they experienced, the higher self-esteem on Social, Acceptance they have. But the other factors in self-esteem were not significantly related with the teachers' violence. Finally, the quality of school life was significantly associated with self-esteem. The higher the quality of school life they experienced, the higher self-esteem they have. The findings from the present study was significantly related to the quality of school life and self-esteem in adolescents, emphasize the important role of teacher in adolescents' healthy school life and development.

神經外科領域에서의 Minocycline의 臨床效果 : An Electron Microscope Study

都鍾雄,鄭相燮,金相喆,李揆彰,李憲梓 최신의학사 1975 最新醫學 Vol.18 No.8

Minocycline, 7-dimethylamino-6- deoxy-6-demethyltetracycline is a new semisynthetic tetracycline which has a broad antibacterial spectrum. It is effective in vitro aganist many Gram-positive- and Gram-negative bacteria including tetracycline-resistant staphylococci and pseudomonas species. Several reports in the literature attest to its in vitro effectiveness, suggesting that it is the most effective tetracycline now available for clinical use. Animal studies have been reported on its effectiveness in vivo, but there are few reports in the clinical literature of the use of Minocycline in the, treatment of human diseases except urinary and upper respiratory tract infections. , In this report, the. in vitro activity of Minocycline against a number of pathogenic bacterial I strains, compared with various antibiotics, is described as well as the clinical- effectiveness- of this drug_ in the. treatment of various infectious diseases in the neurosurgical field. 1) In various neurosurgical infectious diseases, 69 pathogenic bacterial strains were isolated from 52 patients. Staphyloccus aureus was the most common organism(42%) and pseudomonas, E. coli, and proteus strain followed in order. 2) In antibiotic sensitivity of 69 strains tested, Minocycline showed the most broad antibacterial spectrum and highly sensitive to various organisms especially staphylococcus aureus and pseudomonas strain compare with gentamycin, ampicillin and knamycin. 3) Forty out of 52 patients responded well clinically to Minocycline theraphy within 15 days of treatment and no serious side effects were noted except ocassonal.

^(169)Yb-DTPA를 이용한 Cisternography

도종웅,김상철,이규창,이헌재,양병철,박창윤,최병숙 대한신경외과학회 1977 Journal of Korean neurosurgical society Vol.6 No.1

The radioactive nucleid cisternography is being used as a diagnostic adjunct of CSF rhinorrhea and otorrhea, hydrocephalus, patency after ventricular shunt operation, brain tumor and cangenital anomalies of the central nervous system. In numerous radioactive nucleids, ^(169)Yb-DTPA is known to have moderately effective half life, high energy level for scintilation, and pure r-emitter in subarachnoid space. Authors review some clinical advantage of cisternography using ^(169)Yb-DTPA applied in the diagnosis of CSF rhinorrhea and otorrhea, hydrocephalus, CSF fistula and patency after ventricular shunt operation.

외상성 뇌천막주위 혈종

김영수,임호영,나중환,도종웅,장경식 대한신경외과학회 1986 Journal of Korean neurosurgical society Vol.15 No.3

A clinical analysis of unusual sited traumatic subural hematomas are presented and discussed. These disorders are rare form of intracranial hemorrhage. Commonly, acute subdural hematoma is located in the cerebral convexity, which shows a cresent-shaped increased density on axial Brain CT scan. A conventional axial CT scan is difficult to detect the tentorial subdural hematoma because of artifact of petrous pyramid. So coronal CT scan is prefered diagnostic procedure. This hematoma is originated from a bridging vein at the edge of a tetorial or falx-tentorial junctional tear. Interhemispheric subdural hematoma is originated from a bleeding of bridging vein between the superior saggital sinus and cerebral cortex. Conservative treatment for above hematoma may be beneficial unless neurological deterioration necessitates early operative procedure.