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Wire Saw 슬러리로부터 Si와 SiC의 선택적 회수
한승열,이종대,전진혁,박노국,이태진,류시옥 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.1
This study was focused on the recovery of Si and SiC from wire saw slurry in wire saw slicing process. In order to separate Si and SiC from wire saw slurry, alkali dissolution method was used and then Na₂O showed superior dissolution property of Si. At this time, SiC was separated as powder from alkali aqueous solution. Si was dissolved as a liquid in alkali aqueous solution. After removing SiC powder, the powder was obtained by drying alkali aqueous solution and then it's XRD analysis showed that it was the water glass (Na₂SiO₃).
이승진,유주순,정수열,최용락 東亞大學校附設遺傳工學硏究所 1998 遺傳工學硏究 Vol.- No.5
발효시켜서 만드는 감식초에서 시료를 채취하여 배양하고, pellicle을 형성하는 single colony를 cellulose생합성균으로 분리하였다. 분리된 균주는 형태적 특성, 알콜의 재산화 등의 생리, 생화학적 특성 등에 의하여 Acetobacter속으로 분류되었으며, Acetobacter CBI-2라고 명명하였다. Acetobacter CBI-2는 정지배양 시에 기존의 생합성 균주로 알려진 Acetobacter xylinum과 대등한 cellulose생합성 능력을 나타내었다. Acetobacter CBI-2이 생성한 고분자물질의 분해산물을 TLC법으로 확인한 결과 기존 cellulose의 것과 일치하였다. Acetobacter CBI-2에서 genomic DNA를 분리 정제하여 cel A 영역을 probe로 하여 hybridization시킨 결과, 상동성을 나타내어 분리 균주에는 cellulose 생합성 관련 유전자가 존재함을 나타내었다.(1997년 1월 7일 접수, 1997년 2월 24일 수리). A screening was performed to isolate the cellulose-producing microorganisms from vinegar in Korea. The isolated strain was identified as Acetobacter sp. with respect to physiological and biochemical characteristics and designated as Acetobacter CBI-2. Cellulose production of Acetobacter CBI-2 was equal with the well known cellulose-producing bacteria, A.xylinum. The result of separation on thin layer chromatography (TLC) was consistent with the degradation product of native cellulose. The presence of genes required for the cellulose biosynthesis in Acetobacter CBI-2 was confirmed by Southern hybrization.
윤승환,김근수,장호열,김영수 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.7
12l patients with cervical(45 patients). thoracolumbar(76 patients) compression or mild burst fractures from January 1984 to December 1994 were studied : 98 patients were treated postural reduction with hyperextension posture and 23 patients were with postural reduction and surgical methods We compared the initial and post-reduction compression height ratio. wedge angls and kyphosis angle of compression fractures The results were not only expansion of a compressed vertebral body but also successful fusion. The neurological recovery status according to Frankei classification was also improved after postural reduction. Most of the compression fractures or stable burst fractures of the cervical. thoracolumbar spines can be restored by the postural reduction
아미노산 투여가 운동중 싸이클선수의 젖산 및 심박수에 미치는 영향
이승국,유병렬,김문희,김완조,이선장 韓國體育大學校附屬 體育科學硏究所 1992 韓國體育大學校附屬 體育科學硏究所論文集 Vol.11 No.1
The purpose of the study was to determine whether a 15.6mg.Kg ??' does of glutamate given one hour prior to incremental exercise test would reduce the lactate formation. Five well trained cyclists served as subjects in this experiment which included a placebo and glutamate trial. The subjects initially work on treadmill 200m/min for 3 minutes and here increased the workload by 20m/min every 3minutes until exhaustion. Blood lactate were collected from finger-tip. Subjects in the glutamate trial showed significantly lower lactate formation during exercise then they did in the placebo trial. In both groups no significant difference was found on heart rate. During the recovery lactate and heart, rate were unaltered in either the glutamate or placebo trials. In summary, glutamate ingestion may reduce lactate formation resultly improvement of performance.
金聖烈,崔宇永 충남대학교 농업과학연구소 1978 農業技術硏究報告 Vol.5 No.2
A series of experiments over three years was planned for practical application of rhizobia in farms and grass lands in Korea. This is the report for the studies of the first year mainly on the isolation and characterization of rhizobial strains, and on the assessment of their nodulation abilities and nitrogen fixation capacities. 1. Total number of 88 strains for soybean group and 22 strains for pea and vetch group was isolated from nodules which were taken from legumes grown in Daekwanyong, Cheju and various places in Korea. 2. Morphological and cultural characteristics of the strains were studied, and attempts were also made to investigate their antigenic properties and to demonstrate lysogenic strains in these groups. The results were: ⅰ) the isolates varied in cultural characteristics on yeast mannitol broth and agar, and in degree of congo red absorption; ⅱ) similarities in their antigenic properties were found between/among the strains: G-3/G-9/D216, G-20/G-52 in soybean group; ⅲ) no lysogeny was found in the strains of these groups. 3. Plant infection tests by test tube and bottle method in light room were carried out to elucidate the ability of the strains to nodulate specific legumes and of the capacity of such nodules to fix atmospheric nitrogen. The isolates were grouped into non-invasive, ineffective, or effective to the legumes. Those strains which produced effective nodules, supporting similar level of growth as nitrate control, were; P-3, 4 and 8 in pea and vetch group; G-23, 27, and, D-216 in soybean group.
XOR 연산을 이용한 저비용 RFID 시스템의 보안 접근 제어 기법
최승술,최창열 강원대학교 정보통신연구소 2006 정보통신논문지 Vol.10 No.-
The security of RFID(Radio Frequency IDentification) systems has been an important and challenging issue. There have been a variety of research activities in the RFID security field. Usually, hash-based schemes have been introduced for access control between readers and tags. One of major drawbacks is the usage of many gates, so that the practical implementation becomes difficult in low-cost RFID system. In this paper, we propose a new access control technique which supports low-cost RFID systems with a few gates (e. g., 5000 gates). The proposed scheme based on XOR operation can efficiently implement low-cost RFID tags. Furthermore, the scheme guarantees the security from, eavesdropping, location tracking, replay attack, and spoofing by using a random secret key in every session.
이승진,이석열,박형주,이철세 순천향의학연구소;Soonchunhyang Medical Research Institute 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2
Rupture of the main bronchus followed by blunt chest trauma is relatively rare but, with increasing traffic accidents, the incidence has been increasing recently. Early diagnosis and management for the traumatic bronchial rupture is essential to reduce morbidity, mortality and late complication but often, it is comcealed in cases of blunt chest trauma and particularly it is associated with multiple other organ injuires. Especially, bronchial pseudoaneurysm which maintains airway patency after complete transection of the bronchus by blunt chest trauma is very unusual case. We report a case of a 15 year old male who had complete bronchial transection with bronchial pseudoaneurysm.The bronchial rupture was comfirmed by spiral chest CT and 3D reconstruction. In the operation, right main bronchus was completely transected and separated but the airway was patent to the right lung by pseudoaneurysm of the bronchus. Resection of the pseudoaneurysm and end to end anastomosis of the bronchus was performed successfully.