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정영욱(Young Wook Cheong),전효택(Hyo Taek Chon) 대한자원환경지질학회 1990 자원환경지질 Vol.23 No.4
Mechanical, physical and petrographic properties of seventeen marble specimens collected from ten marble mines in Korea were investigated. Studied marbles were mainly composed of calcite, dolomite, and various amounts of serpentine, tremolite, olivine, quartz and opaque minerals. Complete and sutured textures were dominant. Compressive strength measured normal to the bedding plane is larger almost two times than that measured parallel to the bedding plane. From the results of Shore hardness test on marbles, water content was an important factor to decrease Shore hardness values. Engineering geological properties, especially, compressive strength, Young’s modulus, wear resistance and water absorption could be controlled by the presence of quartz, and the type of marble texture. Water absorption-porosity, compressive strength-Young’s modulus, and impact strength index-Los Angeles abrasion couples show good correlation. According to the comparative utility as commercial stone, it could be concluded that marbles from the Banglim mine, Songbo mine, Kwangdeok mine and Bongjeong mine were superior to that of other studied marbles.
3-Amino-1,2,4-triazole에 의해 가교된 Epoxidized Natural Rubber의 열적, 기계적 물성과 형상기억거동
정종훈,장영욱 한국공업화학회 2003 응용화학 Vol.7 No.2
Epoxidized natural rubber(ENR) was cured with 3-amino-1,2,4-triazole(ATA) which was catalyzed by bisphenol A to produce a shape memory polymer with variable glass transition and mechanical properties. Stress-strain analysis showed that tensile strength and modulus increased while elongation at break decreased as the increase in ATA content in the network. Dynamic mechanical analysis showed that the glass transition temperature can be readily controlled from 20℃ to 77℃ and storage modulus can be increased by varying the molar ratio of ATA : ENR from 0.05 to 0.2. And the cured ENR exhibited a excellent shape memory behavior.
강진한,김홍빈,손장욱,이상오,정문현,정희진,최영화,최정현,최준용,최희정 대한감염학회 2008 감염과 화학요법 Vol.40 No.1
In 2007, the Korean Society of Infectious Diseases recommended an immunization schedule for adults residing in Korea. This recommendation includes four categories: standard immunization for healthy persons, supplementary immunization for persons with underlying illnesses, recommendations for health-care personnel and for international travelers. The Standard Immunization Schedule consists of universal vaccination (tetanus-diphtheria/tetanus-diphtheria-pertussis (Td/Tdap); hepatitis A vaccine for persons aged 20s; human papilloma virus vaccine for women under 26 years old; meningococcal vaccine for military recruits and college students in dormitories; influenza vaccination for persons aged 50 years or more and pregnant women; and pneumococcal vaccination for persons aged 65 years or more) and catch-up vaccination (hepatitis A vaccine for persons aged 30s; hepatitis B vaccine, varicella and MMR vaccines for persons who have uncertain specific immunities). The Supplementary Immunization Schedule recommends 4 vaccines, i.e., pneumococcal, influenza, meningococcal, and Haemophilus influenzae type b, appropriate to the underlying illnesses, and confirmation of the presence of antibodies to hepatitis A and hepatitis B. The Recommendation for Health-Care Personnel includes universal vaccination (influenza and pertussis) and catch-up vaccination (hepatitis B, measles-mumps-rubella and varicella for seronegative health-care personnel). The Recommended Immunization for International Travelers focuses reinforcement of vaccinations for healthy persons and includes certain immunizations necessary for international travel (yellow fever, meningococcal, plaque, tick-borne encephalitis, and cholera). These guidelines can be seen at www.ksid.or.kr.
서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)
김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.
Estimation of Alkali Overdosing in a Lime Neutralization Process for Acid Mine Drainage
( Young-Wook Cheong ),( Dong-Wan Cho ),( Jin-soo Lee ),( Won Hur ) 한국공업화학회 2022 공업화학 Vol.33 No.1
Lime has been used for the neutralization of acidic waste because it is cheap and available in large quantities. The resulting sludge often contains a considerable amount of unreacted lime due to alkali overdosing, even during automatic neutralization processes, which mainly arises from the poor solubility of lime. The sludge cake from lime neutralization of Ilkwang Mine also contained high percentages of calcium and magnesium. The elemental content of the sludge cake was compared with those obtained from a simulation of the lime neutralization facility installed at Ilkwang Mine. A Goldsim® model estimated the degree of lime overdosing to be 19.1% based on the fractions of ferrous oxide. The analysis suggests that resolubilization of aluminum hydroxide could occur in the settling basin, in which pH exceeded 10 due to the continued dissolution of the overdosed lime. The present study demonstrated that chemical analysis of sludge combined with process simulation could provide a reasonable estimate of mass balance and chemistry in a neutralization facility for acid mine drainage.
Cheong‑Weon Cho,Gi‑Ho Son,Hye‑Jin Lee,Young‑Guk Na,Hong‑Ki Lee,Sung‑Jin Kim,Hyun‑Wook Huh,Kyung‑Tae Kim,Jong‑Seong Kang,Young‑Ho Kim,Chang‑Seon Myung,Min‑Ho Yoon,Seok Jin Kim,Hyun So Cho,Jae‑Young Lee 한국약제학회 2019 Journal of Pharmaceutical Investigation Vol.49 No.6
It has reported that Morus alba has properties to treat fever, protect liver damage, improve eyesight, strengthen the joint, facilitate discharge of urine, and prevent high blood pressure. Extracts from herbal plants, have hygroscopic and low flowability characteristics. Due to these properties, it is difficult to develop the formulation using herbal extracts in pharmaceutics. In this study, Morus alba leaf extract (MLE) was fermented by Viscozyme ® (MLE-V) and Pectinex ® (MLE-P) as well as non-fermented MLE (MLE-C). Physicochemical properties of MLEs were evaluated for optimization of formulation. As a result, cell viability was higher MLE-V than MLE-P, although there was no difference in flowability depending on the enzyme type. Based on the pre-formulation study, MLE-V was selected. Wet granulation method was used to overcome the poor flowability of MLE and MLE tablet was developed by statistical-based experimental design method. A Box-Behnken design, one of the models of experimental design, was constructed using lactose content in lactose plus microcrystalline cellulose (X1), disintegration agent (X2), and binding agent (X3). The dependent variables were hardness (Y1), friability (Y2), and disintegration time (Y3). Finally, MLE tablet with hardness (11.83 ± 0.36 Kp), friability (0.26 ± 0.01%) and disintegration time (1395.56 ± 49.84 s) were optimized. This is the first work to report the formulation design using herbal extracts fermented with enzyme through quality by design.
Generation of Entangled Coherent States
Young Wook Cheong,이진형 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.II
We propose a scheme to generate entangled coherent states. We utilize the cross Kerr nonlinearity to generate superposed coherent states which can be easily transformed to entangled states. The generated states have definite photon number characteristic which gives the states discrete nature, thus, it can simulate maximally entangled states of two $d$-level quantum systems effectively. We also discuss possible applications utilizing the states.
움직임 벡터를 이용한 히스토그램 장면 전환 검출 기법의 개선
한영욱(Young-Wook Han),정성일(Seong-Il Cheong),김성재(Seong-Jae Kim),이시영(Si-Young Lee),김승호(Sung-Ho Kim) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.2Ⅱ
히스토그램 장면 전환 검출(histogram scene change detection) 기법은 입력 영상 내에 카메라 동작(camera operation)이 발생한 부분을 컷(cut)으로 나누는 문제점이 있다. 본 논문에서는 이러한 문제점을 해결하기 위해 프레임 사이의 움직임 벡터를 측정하여 카메라 동작이 일어났는지를 판단하고, 이를 이용하여 잘못된 컷의 인식을 막는다. 카메라 동작이 발생하는 샷의 경계는 컷이 될 수 없으므로, 이외의 샷에 대해 컬러 히스토그램 교집합(color histogram intersection)을 구해서 장면 전환 여부를 판단한다. 제안된 기법은 기존의 히스토그램 장면 전환 검출 기법보다 프리시젼(Precision) 면에서 성능 향상을 보였다.