A 0.12GHz-1.4GHz DLL-based Clock Generator with a Multiplied 4-phase Clock Using a 0.18um CMOS Process

Chi, Hyung-Joon,Lee, Jae-Seung,Sim, Jae-Yoon,Park, Hong-June The Institute of Electronics and Information Engin 2006 Journal of semiconductor technology and science Vol.6 No.4

A $0.12GHz{\sim}1.4GHz$ DLL-based clock generator with the capability of multiplied four phase clock generation was designed using a 0.18um CMOS process. An adaptive bandwidth DLL with a regulated supply delay line was used for a multiphase clock generation and a low jitter. An extra phase detector (PD) in a reference DLL solves the problem of the initial VCDL delay and achieves a fast lock time. Twice multiplied four phase clocks were generated at the outputs of four edge combiners, where the timing alignment was achieved using a coarse lock signal and the 10 multiphase clocks with T/8 time difference. Those four clocks were combined one more time using a static XOR circuit. Therefore the four times multiplication was achieved. With a 1.8V supply, the rms jitter of 2.1ps and the peak-to-peak jitter of 14.4ps were measured at 1.25GHz output. The operating range is $0.12GHz{\sim}1.4GHz$. It consumes 57mW and occupies 450*325um2 of die area.

골뱅이(Buccinum Undatum) 알레르기 : 감작률과 다른 음식물 항원과의 연관성 Sensitization rate and its relationship with other food allergens

이재영,윤성호,서유진,최정희,서창희,남동호,김윤근,민경업,박해심 대한천식 및 알레르기학회 2004 천식 및 알레르기 Vol.24 No.1

Background : The common whelk (Buccinum undatum) is one of the largest and most common snails in the North Atlantic. In Korea and Japan, common whelk is a popular eatable shellfish. Although shellfish has been known as the one of the most common causes of food allergy, there has been no published report on allergenecity and clinical significance of this sea snail. In this study, we determined the sensitization rate to common whelk and its relationship with other food allergens in allergy patients. Method : We carried out the skin prick test (SPT) with commonly consumed food stuffs in Korea including common whelk in 1700 patients over 1 year. The specific IgE to common whelk were detected by enzyme-linked immunosorbent assay (ELISA). ELISA inhibition test using sensitized sera was conducted. Results : SPT to common whelk was positive (≥2+) in 83 (4.9%) patients studied. Twenty-four (38.7%) of 62 SPT-positive patients had high serum specific IgE to common whelk. ELISA inhibition test showed significant inhibitions by abalone as well as by common whelk and, minimal inhibition were noted by shrimp. Significant correlation was also noted in specific IgE levels between common whelk and abalone (r=0.58, F<.05). Conclusion : IgE-sensitization rate to common whelk was 4.9% in allergy patients. Further stuides are needed to evaluate the clinical significance of sensitized patients to common whelk, and to confirm a cross reactivity with abalone. (J Asthma Allergy Immunol 24 : 77-84, 2004)

화상처리에 의한 춉트 스트랜드 섬유배향의 분포측정

김혁,윤성운,한길영,심재기,이동기 조선대학교 생산기술연구소 1995 生産技術硏究 Vol.17 No.2

In order to examine the accuracy of intensity method, the fiber orientation distribution of chopped strand reinforced polymeric composites is measured using image processing. Theoretical and experimental results of fiber orientation function are compared with each other for the composites having different fiber content and fiber orientations. An intensity method is used for the experimental investigation and the measured fiber orientation function is compared to the calculated one. The results show that, firstly, the feature of fiber orientation can be represented and identified by the fiber orientation function J measured and theoretical fiber orientation functions, J_(M) and J, respectively and related as J_(M)=0.73J. Secondly, as far as the measuring of fiber orientation is concerned, the intensity method is, in general, found to be quite effective due to its feature of using the intensity difference in the measuring ranges. Finally, the accuracy of the method increases when the fiber with less clash is considered.

컴퓨터 면역시스템 개발을 위한 생체 면역시스템 모델링

선상준,심재윤,심귀보 중앙대학교 정보통신연구소 2000 정보통신연구소논문집 Vol.2 No.2

본 논문은 생체 면역시스템의 자기와 비자기를 구분하여 인식하는 세포독성 T세포의 특징을 이용하여 컴퓨터에서 자기 파일과 비자기 파일을 구분할 수 있는 T세포를 모델링하였다. 모델링한 T세포는 MHC 인식부와 향원 인식부로 구성되며 각각의 인식부를 이용하여 비자기 파일에 적용시켜 자기-비자기 구분이 가능함을 컴퓨터 시뮬레이션을 통하여 입증하였다. Biological immune system distinguishes nonself from self-body and protects self intrusion such as virus, pathogenic bacteria. In this paper, we make a model of the T-cell of immune system to apply to computer immune system. The modeled T-cell possesses the ability to be able to distinguishes self files from random files in computer. The T-cell consists of MHC perception and antigen perception, and distinguishes self from non-self through matching file which we must test. We verify the effectiveness of the proposed method by applying self-nonself discrimination in a computer virus.

백서 적혈구에서 glutathione이 paraquat 독성에 미치는 영향

김명철,박재윤,채기영,천영욱,박평심,차종희 朝鮮大學校 附設 醫學硏究所 1991 The Medical Journal of Chosun University Vol.16 No.2

The participation of superoxide in initiating tissue damage from administration of a xenobiotics is best illustrated by paraquat intoxication, in which it is known that one electron reduction of paraquat leads to the formation of radicals which react with molecular oxygen to give superoxide. In the present study, the effects of paraquat on the level of glutathione and activities of superoxide dismutase(SOD), catalase, glutathione peroxidase, glutathione reductase and glutathione stransferase were investigated in rat liver and erythrocytes. The contents of glutathione in liver and blood were sinificantly decreased by paraquat administration, but the activities of enzymes were unaltered. Incubation of the buffered aerobic mixture of erythrocyte in the presence of 5mM glucose, Paraquat and/or N-ethylmaleimide(NEM) resulted in the formation of lipid peroxide, the activities of various enzyme and the levels of glutathione were determined. The malondialdehyde(MDA) contents as a indicator of lipid peroxidation was decreased and the levels of total glutathione were not changed but the levels of oxidized glutathione(GSSG) were in creased in paraquat treated erythrocytes. The activites of ezyme were decreased in paraquat treated erythrocytes but in reduced glutathione(GSH) treated erythrocyte, the enzymes activities were less decreased by paraquat. These results suggest that paraquat toxicity was probably somewhat reduced by GSH, but paraquat-induced injury were not increased by GSH depletion in erythrocytes.

마이크로파 플라즈마CVD의 광방출 스펙트럼

박상현,박재윤,김영국,심정봉 경남대학교 신소재연구소 1998 論文集 Vol.10 No.-

마이크로파 플라즈마CVD에서 방출되는 656.4[nm]의 Hα와 거의 같은 정도의 감도를 가진 388.4[nm]의 피크를 조사하기 위하여 N2, N2-CH4, H2-CH4 및 Air-CH4 가스의 마이크로파 플라즈마로부터 방출되는 스펙트럼들을 조사하였다. N2-CH4 플라즈마와 Air-CH4 플라즈마로부터 방출되는 388.4[nm]의 피크는 N2로부터 방출되는 337.1, 357.8 및 316.0[nm]의 피크와 공존하기 때문에 CN의 피크로 판단되고, H2-CH4 플라즈마로부터 방출되는 388.4[nm]의 피크는 N2로부터 방출되는 337.1, 357.8 및 316.0[nm]의 피크가 나타나지 않았기 때문에 CH의 피크로 판단된다. The optical spectra of microwave plasma by four kinds of gases(N₂. N₂-CH₃. H₂-CH₄ and Air-CH₄) have been measured for investigating 388.4[nm] peak which has the same intensity as H_{a}(656.4[nm]) peak. A 388.4[nm] peak by N₂-CH₄plasma and Air-CH₄plasma may be CN peak becau se it is with 337.1. 357.8 and 316.0[nm] peaks by N₂. And a 388.4[nm] peak by H₂-CH₄plasma without by N₂337.1. 357.8 and 316.0[nm] peaks may be CH peak.

난소 및 난소 종양 염전의 초음파 소견

오연희,이현경,이원재,이성우,박수성,윤혜원,임문환,심재철,김용탁,김성숙,김정란 동국대학교 경주대학 1993 東國論集 Vol.12 No.-

Acute torsion of the ovary and ovarian mass is a recognized surgical emergency, but rarely has the diagnosis been made preoperatively on the basis of imaging studies. The sonographic findings in 14 cases of surgically proven torsion of the ovary and ovarian mass are described. Mostly cystic ovarian mass, engorged vessel, dilated uterine tube, beak-like echo(torsion site), smooth mass wall thickening an free-fluid collection in cul-de-sac are described. More significant in terms of specificity were the demonstration in 6 cases(42.9%) of the smooth mass wall thickening and in 8 cases(57.1%) of a free fluid in the cul-de-sac. We report the sonographic findings of ovary and ovarian mass torsion that may suggest the preoperative diagnosis of this condition.

장기간 보관한 멸균물품의 오염 상태에 관한 연구

주홍순,조순덕,정재심,신동분,임바올라,노은지,이선희,송영미,최정화,백병윤,김미나 대한병원감염관리학회 2003 의료관련감염관리 Vol.8 No.1

세포브러쉬와 면봉도말법에 의한 부인과 세포학적 검사의 효율비교

김정란,김성숙,배한익,김용탁,심재철,임문환,윤혜원,이상식 동국대학교 경주대학 1993 東國論集 Vol.12 No.-

A study was undertaken to evaluate the efficiency of the sytobrush compared with the cotton swab for obtaining cells from the uterine cervix. In 300 patients, the cytobrush technique was employed and in control 300 patients was smeared by the cotton swab. In 12 out of 300 patients(4%) endocervical cells were found on the cotton swab technique. A total of 252 out of 300 cytobrush sampler specimen(84%) contained endocervical cells. With the X²method for statistical comparison, the difference in endocervical cell yield between the cotton swab and the cytobrush sampler was significantly different(p<0.01). This was particularly true in older patients. We conclude from study that the cytobrush sampler is of value for obtaining as adequate cervical cytologic specimen.

산전 초음파로 진단된 선천성 수신증 태아의 경험 1례

강민아,김도균,최석철,양회생,배철성,윤혜원,심재철,하달봉 동국대학교 경주대학 1997 東國論集 Vol.16 No.1

Prenatal ultarsound represents an accurate and reliable method for the detection of intrauterine anomalies, especially urinary tract anomalies. Hydronephrosis is the most common congenital condition detected by prenatal ultrasound. Prenatal ultrasonographic diagnosis allows a good condition and therapeutic assessment of the patients prior to serious impairment of renal function so that in most cases the urological surgeon can opt for a parenchymal conserving procedure. The authors have experienced a case of congenital ureteropelvic obstruction with hydronephrosis diagnosed at 32 weeks of pregnancy and report our experience with a brief review of literature.