Solubility of TiO2 in NaF‑CaF2‑BaF2 Melts

Jeong‑Hyun Yoo,Sung‑Wook Cho 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.6

The solubility of TiO2in NaF-CaF2-BaF2 ternary eutectic melts was investigated at the temperature range of 1025–1150 °C. The least-squares equation was obtained from the relationship between the reciprocal temperature and the natural logarithm ofthe titanium concentration in the melts saturated with TiO2. The corresponding partial molar enthalpy of dissolution of TiO2was found to be 188 kJ/mol. The titanium saturation concentration was 3.73 wt% at 1100 °C. From the titanium concentrationchange with the added amount of TiO2at different holding time after a final stirring, it was found that not only completedissolution of TiO2but also enough sedimentation of excessive TiO2should be guaranteed to obtain more reliable solubilitydata. The holding time of 10 h was found to be enough for the excessive TiO2particles to settle down in our experimentalconditions. It is noteworthy that in case of adding TiO2in excess of its solubility, the Ba1.12(Ti8O16) phase was observed atthe lower and bottom of the solidified salt ingots.

Homomorphic Encryptions at a Long Distance Through Quantum Key Distribution Protocols

JEONG*, Kabgyun,KIM, Yong Jin,YOON, Jong Beom,KIM, Geon Woo,CHO, Gueha,KIM, Suntaek Korean Physical Society 2019 새물리 Vol.69 No.2

Development of Stable CHO-S Cell Line for the Production of Human Monoclonal Antibody Ab417

Giyoung KWON,Munsik JEONG,Seulki CHO,Haejung KIM,Hyo Jeong HONG 한국생물공학회 2015 한국생물공학회 학술대회 Vol.2015 No.10

An Analysis of Diplomatic Relations between the Republic of Korea and the Republic of Kazakhstan, and Its Prospects

Cho,Eun-Jeong,Kim,German N 고려대학교 러시아 CIS연구소 2012 Acta Russiana Vol.4 No.-

В 2012-ом году Республика Корея и Республика Казахстан отмечают 20- летие установления дипломатических отношений. В данной статьи рассматривается, какие внешние и внутренние детерминанты оказывали решающие влияние на создание, применение и дополнение внешней политики Республики Корея в отношений Казахстана с того момента, когда обе страны установили дипломатических отношений. Теория процесса принятия решений внешней политики, которая развивалась в основном в рамках послевоенной американской политологии с середины 20 века, показывает, что в отличии от традиции "реалистической" теории в современном мире "разные" факторы через "сложный и многослойный" процесс оказывают влияние на создание и применение дипломатической политики, и её результаты имеют обратную связь и принимаются во внимание в последующем потоке деятельности. В течение 20 лет дипло-матических связей южнокорейско казахстанские отношения развивались через три периода. Это во-первых, период образования отношений с момента установления дипломатических отношений в начале 90-ых годов до азиатского финансового кризиса в конце 90-х годов, во-вторых, период развития связей на основе экономического и ресурсного сотрудничества с начала 2000-ых годов до прихода к власти нынешней администрации в 2007 году и, в-третьих, период диверсификации отношений не только в экономическом, но и в политическом, культурном, социальном секторах с прихода к власти нынешней администрации Ли Мён Бака в 2008 году до сегодняшнего дня. В данной статьи рассматривается, какие именно внешние и внутренние факторы во вышеуказанных 3 периодах сыграли главную роль во принятии дипломатического курса Республики Корея в отношении Казахстана и намечаются, какие особенности существуют в Южнокорейско-Казахстанских отношениях во время развития дипломатических отношений обеих стран.

에어컨 냉각 팬용 브러쉬레스 DC 전동기의 역기전력 분석에 대한 연구

조정현,김지현,정정원,황흥식,이치우 경성대학교 공학기술연구소 2012 공학기술연구지 Vol.18 No.-

Compared to conventional dc motors having the combination of commutators and brushes, a brushless DC (BLDC) motor is one of the highly efficient motors due to its electrical commutation without a brush, and this feature allows the BLDC otor to be more suitable for an application requiring no maintenance due to mechanical wear between a commutator and a brush. Also, the BLDC motor has a few benefits over both a dc motor and an induction motor such as high dynamic response, high efficiency, logn life span, and low noise in wide speed-torque region. This paper investigates the variation of voltage induced in phase windings in a BLDC motor in several cases with respect to stack length, steel grade, and coil material. This study is numerically conducted and it is verified from the theoritical point of view by comparing the result of simulation with that of experimental measurement.

Skin entrance dose for digital and film radiography in Korean dental schools

Cho, Eun-Sang,Choi, Kun-Ho,Kim, Min-Gyu,Lim, Hoi-Jeong,Yoon, Suk-Ja,,Kang, Byung-Cheol 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.4

Purpose : This study was aimed to compare skin entrance dose of digital radiography with that of film radiography and to show the dose reduction achievement with digital systems at 11 dental schools in Korea. Materials and Methods : Forty six intraoral radiographic systems in 11 dental schools were included in this study. Digital sensors were used in 33 systems and film was used in 13 systems. Researchers and the volunteer visited 11 dental schools in Korea. Researchers asked the radiologic technician (s) at each school to set the exposure parameters and aiming the x-ray tube for the periapical view of the mandibular molar of the volunteer. The skin entrance doses were measured at the same exposure parameters and distance by the technician for each system with a dosimeter (Multi-O-Meter : Unfors instruments, Billdal, Sweden). Results : The median dose was 491.2 μGy for digital radiography and 1,205.0 μGy for film radiography. The skin entrance dose digital radiography was significantly lower than that of film radiography (p<0.05). Conclusion : Fifty-nine percent skin entrance dose reduction with digital periapical radiography was achieved over the film radiography in Korean dental schools.

Understanding the attitudes toward sunless tanning product use: implication of tanning product consumption

Jeong‑Ju Yoo,Hyeon Jeong Cho 한국의류학회 2018 Fashion and Textiles Vol.5 No.1

The goal of this study is to test the antecedents of overall attitudes toward sunless tanning product use. The data collected from 302 US female college students with an average age of 20.11 were included in the analysis. A structural equation modeling was performed to test the hypothesized relationships. The results revealed that body surveillance and social ostracism influenced the individuals’ cutaneous body image dissatisfaction, which also influenced perceived attractiveness and fitness of tanned appearance. Perceived tanning attractiveness and perceived tanning physical fitness positively influences attitudes toward tanning product use. It is evident that seeing one’s own body through the lens of others is at the root of positive attitudes toward sunless tanning products. Positive attitudinal changes toward sunless tanning products can be successfully established emphasizing sunless tanning products as fashion consumption. The findings in this study have important relevance, in that tanning products can be marketed as cosmetic appearance-enhancement products for people to look attractive, toned, and fit.

급성 충수돌기염 의증 환자의 진단에서 컴퓨터 단층촬영과 초음파검사의 비교 분석

이정훈,최필조,심민섭,송근정,정연권 대한응급의학회 2001 대한응급의학회지 Vol.12 No.3

Background: This study was conducted to compare the accuracy of computered tomography(CT) and sonography(US) in diagnosing acute appendicitis and to analyze the radiologic factors which influence the result. Methods: We retrospectively studied the cases of 53 patients who were suspected of having appendicitis and who were examined by CT and US covered a three-year period. The final diagnosis was determined from the surgico-pathologic diagnosis and clinical follow-up for two months, as well as from the discharge diagnosis. Results: Thirty-eight(38) patients had acute appendicitis; 15 patients did not. In the analysis, CT and US, respectively, revealed sensitivities of 89.5% and 73.7%, specificities of 93.3% and 60.0%, positive predictive values of 97.1% and 82.4%, negative predictive values of 77.8% and 47.4%. Among patients diagnosed with acute appendicitis, 10 patients were discordant in the US and the CT examinations; CT findings were correct in 8 and US findings in 2. Among non-appendicitis patients, 5 patients were discordant in the US and the CT examinations; CT was correct in 5 and US in 0. Nighteen(19) patients had complications such as an abscess or a perforation. Among these patients, the degree and the extent of the complication were accurately evaluated by CT in 15 patients and by US in 5 patients. Conclusion: CT is more accurate than US in diagnosing and excluding acute appendicitis. The use of CT will substantially decrease unnecessary laparotomies and post-operation complications.

40세 이하 관상동맥 질환자에서 장기적 임상 관찰

이승욱,정명호,박종철,박형욱,조상희,김원,김계훈,이상현,강경태,조장현,김남호,김건형,안영근,조정관,박종춘,강정채 全南大醫大 2001 전남의대학술지 Vol.37 No.2

흔치않은 대상포진 치험 2예 : 비전형적 부위와 다른 부위로 재발한 예 Unusal Dermatome and Recurs Other Dermatome

김정미,조은경,조정선,최용석,한영수,한정호,김두응,최진영 건국대학교 의과학연구소 2004 건국의과학학술지 Vol.14 No.-

Herpes zoster is well known as an acute, self-limited disease of unilateral sensory dermatome caused by varicella-zoster virus and characterized by grouped vesicular skin eruption and pain over several dermatomes as well as single. This virus usually affects the thoracic dermatome and there are a few reports that this virus involves lower lumbar or sacral area, and recurrent cases. We experienced 2 cases that zoster virus involved L4 or S2 dermatome and left typical skin lesions, of which one was a recurrent case involving different dermatome at an interval of 8 years and the other was a rare case involving sacral dermatome.