The Characteristics of Cr-Free Coating Hot Dip Galvanized Sheet Steel

( Jong Gi Kim ),( Man Been Moon ),( Jeong Mo Yun ) 한국부식방식학회(구 한국부식학회) 2011 Corrosion Science and Technology Vol.10 No.1

The greatest purpose of chromate treatment is to improve anti-corrosion by stabilizing a metal surface. Because metal surface forms a compound by absorbing oxygen or water in the air by being generally unstable, it is necessary to improve anti-corrosion of the metal by forming the metal surface with a stable film. When considering the economical efficiency and requirements together because the film of the metal surface treated with chromate has good anti-corrosion and the stability also in the air by being compact and strong, Chromate treatment has been used most up to the electronics industry from the auto industry. However, these days, because hexavalent chromium is both a toxic agent to be able to cause cancers and deadly poisonous environmental pollutant, the strong legal controls on its use is being imposed all over the world. Because of this reason, a new anti-corrosion method is being required. Also, by users` various demands, the passivations that have recently been developed require various characteristics such as conductivity, chemical resistance, alkali cleaning resistance as well as anti-corrosion. We could confirm the results such as excellent anti-corrosion compared to chromate, conductivity, chemical resistance and detergent resistance as the result of analysis of various characteristics of the galvannealed sheet steels coated with Cr-Free solution developed in this research.

高等學校 生物敎科書에 取扱된 植物의 分類

文成基,高碩淳 慶星大學校 1992 論文集 Vol.13 No.2

This study was conducted to classify the plants dealt in 14 kinds of biology textbooks used by the high school student in Korea. These books based upon a newly-revised curriculum were written in 1990. The textbooks comprise 7 kinds of high school science book I (vol. I) and 7 kinds of high school biology. The results obtained were as follows 1. The plants dealt in the textbooks were 11 divisions, 102 families, 177 genera, 138 species, 35 sp., and 20 varieties. According to the category of division, the Spermatophyta was made up of 51 families, 114 genera, 110 species, 2sp., and 16 varieties, whereas, Euglenophyta was made up of 1 family, 1 genus, and 1 sp.. The former was dealt the largest numbers and the latter dealt the smallest. 2. In the science textbook Is (vol. I), textbook G dealt with the largest number of plants(55), while textbook B dealt with the smallest ones(27). In the biology textbook 'SA' dealt with the largest number of plants(82), and textbook 'MA' dealt with the smallest ones(46). 3. Among the 14 textbooks, all the books dealt with the plants of rice and bracken, and 13 books dealt with the plants of corn, pine tree, and onion, which were recognized as the most universal plants. All the 7 volumes of science textbook Is(vol. I) dealt with 6 kinds of plants such as bracken, mimosa, soybean, pea, onion, and rice, while the 7 volumes of biology textbooks dealt with 14 kinds of plants, which indicated that biology textbooks dealt with more various kinds of plants than the science textbook Is(vol. I ). 4. In the numbers of plants dealt by textbooks, textbook G dealt with the largest numbers of plant (16), and textbook 'BA' dealt with 12 kinds of plants. While textbook B dealt with the smallest on (3). Textbook 'RA' dealt with a particular plant only once. 5. In the point of dealt plants as experimental materials, onion was dealt the most frequently in the science textbook Is(vol. I), such waterweed, spinach, and soybean were in the biology textbooks. This suggest that biology textbooks dealt more parts of botanical experiment than textbook Is(vol.Ⅰ).

Numerical Simulation of Flow and Dross Particle Transfer in a 55% Al-Zn Pot

( Hwang Suk Kim ),( Jong Gi Kim ),( Seung Chae Yoon ),( Hee Joong Im ),( Man Been Moon ) 한국부식방식학회(구 한국부식학회) 2012 Corrosion Science and Technology Vol.11 No.3

Computational fluid dynamics (CFD) is nowadays a powerful and reliable tool for simulating different flow processes and temperature. CFD is used to analyze the various pot geometries and operative variables in 55% Al-Zn pot of CGL. In this research, different strip velocities were assumed and then shown the flow pattern in the pot that was similar in the different strip velocities. Temperature distribution in the pot depended on inductors and inlet strip temperature at the steady condition. Generation of dross particles and transport models were considered to describe dross particles evolution inside the pot. In order to observe dross influence by scrap location, dross particles were generated upon the sink roll. Floating time of dross particles is different by scraper locations above the sink roll.

Distribution of Pathogenic Vibrio Species in the Coastal Seawater of South Korea (2017–2018)

Seung Hun Lee,Sang Moon Soh,Go Eun Myung,Eun Jin Choi,In A Kim,Young-Il Jeong,Gi Jun Park,Hee Jung Lee 질병관리본부 2019 Osong Public Health and Research Persptectives Vol.10 No.6

Objectives: Pathogenic Vibrio species are widely distributed in warm estuarine and coastal environments, and can infect humans through the consumption of raw or mishandled contaminated seafood and seawater. For this reason, the distribution of these bacteria in South Korea was investigated. Methods: Seawater samples were collected from 145 coastal area points in the aquatic environment in which Vibrio species live. Environmental data (i.e., water temperature, salinity, turbidity, and atmospheric temperature) was collected which may help predict the distribution of the species (data not shown). Seawater samples were filtered, and incubated overnight in alkaline peptone water, at 37°C. Using species-specific polymerase chain reaction methods, screening tests were performed for the hlyA, ctxA, vvhA, and tlh genes. Clones of pathogenic Vibrio species were isolated using 3 selective plating media. Results: In 2017, total seawater isolation rates for Vibrio vulnificus, Vibrio cholerae (non-pathogenic, non-O1, non-O139 serogroups), and Vibrio parahaemolyticus were 15.82%, 13.18%, 65.80%, respectively. However, in 2018 isolation rates for each were 21.81%, 19.40%, and 70.05%, respectively. Conclusion: The isolation rates of pathogenic Vibrio species positively correlated with the temperature of seawater and atmosphere, but negatively correlated with salinity and turbidity. From 2017 to 2018, the most frequent seawater-isolated Vibrio species were V. parahaemolyticus (68.10 %), V. vulnificus (16.54%), and non-toxigenic V. cholerae (19.58%). Comprehensive monitoring, prevention, and control efforts are needed to protect the public from pathogenic Vibrio species.

수산나프로닐 캡슐 및 염산트라마돌 캡슐의 용출시험에 관한 연구

황정분(Joung-Boon Hwang),문현주(Hyun-Ju Moon),고서연(Seo Youn Go),장기욱(Gi-Uk Jang),이규하(Kyu Ha Lee),손경희(Kyung Hee Sohn),김인규(In-Kyu Kim),조대현(Dae Hyun Cho) 대한약학회 2011 약학회지 Vol.55 No.5

The dissolution test method and an analytical procedure by HPLC were developed and validated for nafronyl oxalate capsules and tramadol hydrochloride capsules. These drugs were not yet characterized by the dissolution specifications in the Korean Pharmaceutical Codex. So, with each reference and test drugs, we did the preliminary and standard experiments based on the Korean Pharmacopeia Guideline of dissolution testing for solid oral dosage forms. The dissolution test for nafronyl oxalate capsules was carried out under sink conditions as follows: dissolution medium phosphate buffer pH 6.8, paddle rotation speed 100 rpm and vessel volume 900 ml. More than 80% of its label amount was released within 30 min in this method. Also the dissolution test for tramadol hydrochloride capsules was carried out under sink conditions as follows: dissolution medium water, paddle rotation speed 50 rpm and vessel volume 900 ml. More than 90% of its label amount was released within 15 min in this method. The dissolution samples were analyzed with a validated HPLC analytical procedure. The analytical methodology showed acceptable values in terms of specificity, linearity, precision and accuracy. The dissolution test methods described above were adequate for the purpose and may be proposed as a pharmacopeial standard to assess the performance of nafronyl oxalate capsules and tramadol hydrochloride capsules. Furthermore, the outcomes of this study were expected to help create an environment where safe and high quality drugs would be distributed on the domestic market making contributions to advancing public health.

A study on composite membranes based on hydrocarbon polymers and ionic liquids for high temperature PEFCs

백지숙(Baek, Ji-Suk),박진수(Park, Jin-Soo),김경현(Kim, Kyung-Hyun),문기영(Moon, Gi-Young),김혜경(Kim, Hye-Kyung),최영우(Choi, Young-Woo),박구곤(Park, Go-Gun),양태현(Yang, Tae-Hyun),김창수(Kim, Chang-Soo),설용건(Shul, Young-Gun) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11

The water-like ionic liquids have been widely used to enable the proton conduction in ionic liquid based membranes at high temperature and anhydrous PEFCs. In this study, we synthesized various kinds of composite membranes based on hydrocarbon polymers having good thermal and mechanical stabilities at high temperatures and ionic liquids. The composite membrane consisting of hydrocarbon polymer and ionic liquid was characterized by thermogravimetric analyzer (TGA) and impedance spectroscopy. Consequently the non-aqueous composite membranes of a variety of hydrocarbon polymer and ionic liquids have good conductivity and thermal stability at high temperature conditions.

2016년도 국내 해양환경내 병원성 비브리오균의 분포 및 해양환경인자간의 상관성 분석

정영일(Young-Il Jeong),명고은(Go-Eun Myung),최은진(Eun-Jin Choi),소상문(Sang-Moon Soh),박기준(Gi-Jun Park),손태종(Tae-Jong Son) 한국환경보건학회 2018 한국환경보건학회지 Vol.44 No.2

Objectives: The pathogenic Vibrios genus denotes halophilic bacteria that are distributed in aquatic environments, including both sea and freshwater. Vibrio cholerae, Vibrio vulnificus, and Vibrio parahaemolyticus are the most important species since they can be potent human pathogens and leading causes of septicemia, wound infections, and seafood borne gastroenteritis. The recent emergence of a potential pandemic clone, V. cholera serotype O1 and the cholera outbreak in South Korea in 2016 indicates the importance of consistent surveillance of pathogenic Vibrio genus within coastal areas. Methods: The present study was undertaken to determine where and how vibrios live in the aquatic environment adjacent to coastal areas of South Korea. For this survey, a total of 838 samples were obtained at 35 different sites in South Korean coastal areas during the period from January 2016 to December 2016. Pathogenic vibrios was determined using the real-time PCR method, and its clones were isolated using three selective plating media. We also monitored changes in seawater and atmospheric temperature, salinity, turbidity, and hydrogen ion concentration at the collection points. Results: The total isolation rates of V. vulnificus, V. cholera (non-pathogenic, non-O1, non-O139 serogroups), and V. parahaemolyticus from seawater specimens in 2016 were 14.2, 13.48, and 67.06%, respectively. Conclusions: The isolation rates of pathogenic vibrios genus showed a positive correlation with temperature of seawater and atmosphere but were negatively correlated with salinity and turbidity.

Alagille syndrome and a JAG1 mutation: 41 cases of experience at a single center

Ahn, Kyung Jin,Yoon, Ja Kyoung,Kim, Gi Beom,Kwon, Bo Sang,Go, Jung Min,Moon, Jin Su,Bae, Eun Jung,Noh, Chung Il The Korean Pediatric Society 2015 Clinical and Experimental Pediatrics (CEP) Vol.58 No.10

Purpose: Alagille syndrome is a complex hereditary disorder that is associated with cardiac, hepatic, skeletal, ocular, and facial abnormalities. Mutations in the Notch signaling pathway, such as in JAG1 and NOTCH2, play a key role in embryonic development. A cardiac or hepatic presentation is a critical factor for determining the prognosis. Methods: We conducted a retrospective study of 41 patients with Alagille syndrome or a JAG1 mutation between 1983 and 2013. Results: The first presentations were jaundice, murmur, cyanosis, and small bowel obstruction at a median age of 1.0 months (range, 0-24 months). The JAG1 mutation was found in 27 of the 28 genetically-tested patients. Cardiovascular anomalies were identified in 36 patients, chronic cholestasis was identified in 34, and liver transplantation was performed in 9. There was no significant correlation between the severity of the liver and cardiac diseases. The most common cardiovascular anomaly was peripheral pulmonary stenosis (83.3%), with 13 patients having significant hemodynamic derangement and 12 undergoing surgical repair. A total bilirubin level of >15 mg/dL with a complex surgical procedure increased the surgical mortality (P=0.022). Eight patients died after a median period of 2.67 years (range, 0.33-15 years). The groups with fetal presentation and with combined severe liver and heart disease had the poorest survival (P<0.001). Conclusion: The group with combined severe liver and heart disease had the poorest survival, and a multidisciplinary approach is necessary to improve the outcome.

Ejector의 유동특성

이행남(Haeng-Nam Lee),박길문(Gil-Moon Park),나기대(Gi-Dea Na),손현철(Hyun-Chul Sohn),고현선(Hyun-Sun Go),박지만(Ji-Man Park),설재림(Jae-Lim Sul) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-

This study analyses flowing characteristics of ejectors whose design expense is cheap and rarely need maintenance. Ejectors are appled for various industrial fields such as waste water treatment facilities, nuclear energy plants and boiler systems because of such advantages. This study analyses flowing of fluid absorbed because of low-pressure of driving pipes and expanded pipes. For this, diameter ratios of driving pipes and expanded pipes, and Reynolds number are changed and interpreted with CFD to identify flowing characteristics such as pressure and velocity distribution.

Development of Al-added High Strength Galvannealed Daul Phase Steel Sheets

( Dong Eun Kim ),( Young Chul Han ),( Heung Seok Ko ),( Jong Gi Kim ),( Man Been Moon ) 한국부식방식학회(구 한국부식학회) 2011 Corrosion Science and Technology Vol.10 No.5

Effects of chemical compositions and manufacturing conditions on mechanical properties and microstructures were investigated in order to obtain galvannealed high strength dual phase steel sheets with superior mechanical properties and coating properties. An intercritical annealing between Acl and Ac3 was conducted to produce the DP (dual phase) steel sheets, followed by quenching to room temperature. The purposes of Al addition are to reduce the iron oxidation with chemical composition (Si, Mn etc.) and to improve the wettability by liquid zinc. The present study will focus on the characterization for making dual phase steel sheets and enhancing the galvanizability of Al added DP steel sheets about continuous annealing line in CGL.