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김종윤,김기정,박세준,김철수,배장근,김정우,김수중,Kim, Jong-Yun,Kim, Gi-Jeong,Park, Se-Jun,Kim, Cheol-Su,Bae, Jang-Geun,Kim, Jeong-U,Kim, Su-Jung 대한전자공학회 2001 電子工學會論文誌-SD (Semiconductor and devices) Vol.38 No.1
In this paper, we propose a new optical security technique using two phase masks based on interferometer. A binary random phase image is used as a reference image and the encrypted image is generated according to the phase difference between the reference image and the original image. If there is no phase difference of a same pixel position in two phase masks, interference intensity of the pixel has minimum value and if phase difference of a same pixel position in two phase masks is $\pi$, its interference intensity has maximum value. We can decrypt the original image by putting two phase masks on each of the two optical paths of the Mach-Zehnder interferometer. Computer simulation and the optical experiments show a good performance of the proposed optical security system. 본 논문에서는 컴퓨터와 리소그라피를 이용하여 암호화된 두 개의 위상카드를 제작하고, 마흐-젠더 간섭계를 이용하여 암호화된 이진영상을 복호화하는 방법을 제안하였다. 이때 두 위상카드 중 하나는 기준 영상으로 사용되고 다른 하나는 암호 영상으로 사용된다. 하나의 랜덤 위상 카드를 기준 영상으로 두고 암호화하고자 하는 영상에 맞게 빛의 간섭 현상을 이용하여 암호 영상으로 사용될 위상 카드를 제작하였다. 원 영상의 복원은 경로차가 같도록 구성한 마흐-젠더 간섭계의 두 경로에 기준 영상과 암호 영상을 위치시켜 간섭시킴으로써 영상을 복원할 수 있다. 위상 카드는 광세기 검출기로 볼 수 없을 뿐만 아니라 복제할 수도 없어서 개인 정보보호 및 인증시스템에 매우 유용하게 사용될 수 있다. 간단한 영상에 대한 광실험을 통하여 제안한 시스템의 타당성을 확인하였다.
김종윤,김학진,길태준,김재영,김형준,차인호,남웅,Kim, Jong-Yun,Kim, Hak-Jin,Kil, Tae-Jun,Kim, Jae-Young,Kim, Hyung-Jun,Cha, In-Ho,Nam, Woong 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.2
Osteoblastoma is a rare tumor of bone representing less than 1% of all tumors of the maxillofacial region. This is a neoplasm of bone characterized by a proliferation of osteoblasts forming bone trabeculae. Because the clinical feature of benign osteoblastoma is nonspecific and osteoblastoma has a pleomorphic histologic appearance, the differential diagnosis is difficult problem. We studies the case records 3 new patients with osteoblastoma. We discussed the case from clinical, radiologic, and histologic feature for differential diagnosis. Three cases from our clinic is reported and analized with previously described cases.
김종윤,김병우,권기록,Kim, Jong-Yoon,Kim, Byung-Woo,Kwon, Ki-Rok 대한약침학회 2007 Journal of pharmacopuncture Vol.10 No.1
Objectives : Heavy metal contents in cultivated wild ginseng from Korea and China were evaluated for the safety purpose. Methods : Arsenic(As), cadmium(Cd), lead(Pb), mercury(Hg), copper(Cu), chromium(Cr), and selenium(Se) from the root, stem, and leaves of the Korean cultivated wild ginseng and the root of the Chinese cultivated wild ginseng were analyzed for the existence of heavy metal contents. Results : Most of heavy metals weren't detected in all the samples. Copper and lead were found in very minute volume and didn't reach the toxic concentration level of 10mg/kg. Samples used in the test were grown in non-contaminated areas, free from heavy metal contamination. Conclusions : Based on above results, cultivated wild ginseng from Korea and China are relatively safe from the heavy metal exposure. But for more rigorous quality control, an epidemiological survey using the samples from more diverse areas should be conducted.
김종윤,Kim, Jong-Yun 한국과학기술단체총연합회 2000 과학과 기술 Vol.33 No.8
우리나라의 2000년도 과학기술 경쟁력이 99년보다 6단계 앞선 22위로 올랐다. 우수한 연구집단 등 무한한 잠재력을 갖고 있지만 기업간 기술협력과 산ㆍ학간 기술이전이 미흡하고 과학기술 발전시스템이 취약한 실정이다. 이에 국가는 학ㆍ연프로그램에 대한 지원과 모니터링을 강화하고 정부ㆍ공공부문의 연구개발 투자를 지속적으로 확대해 나가야 하겠다. 과학기술 발전을 위해선 무엇보다 과학기술자가 우대받는 분위기 조성이 급선무이다.
기능성 소화불량증 환아(患兒)의 위전도에 대한 내소화중탕(內消和中湯)의 효과(效果)
김종윤,이진용,윤상협,Kim, Jong-Yoon,Lee, Jin-Yong,Yoon, Sang-Hyub 대한한방소아과학회 2002 대한한방소아과학회지 Vol.16 No.2
We have surveyed the epidemiology of functional dyspepsia in 7 cases of Children and investigated the therapeutic effect on Functional Dyspepsia following 4 weeks medication of Naesowhajung-tang using Electrogastrogram. The Results were as followings: 1. Sex ratio are 6 males, 1 female; their mean ages, $9.0{\pm}1.41(7-11years)$; length, $137.2{\pm}13.86cm$; body weight, $35.3{\pm}l1.34kg$. 2. Most of subjects have a normal growth state. But one case have severe growth disturbance. Familial tendency for this disease is noted in 85.8%. 3. Abdominal pain was seen in 100% of subjects. The indicated symptom was lowed in order of abdominal pain(100%), nausea vomiting(71.43%), general fatigue(65.34%), vertigo headache(57.14%), belching(55.38%), etc. 4. The EGG finding after treatment was improved in 53%, aggrevated in 43. In cases, postprandial improvement was more remarkable than fasting improvement. Common cold and antibiotics seems to have functioned as an aggrevating factor on gastric motility. From the above results, Naesowhajung-tang seems to have been used in the treatment of functional dyspepsia for children.