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Yb<sub>2</sub>O<sub>3</sub>가 첨가된 (Ba<sub>1</sub>Sr<sub>1</sub>Ca)TiO<sub>3</sub>후막의 치밀화와 유전특성
박상만,이영희,남성필,이성갑,Park, Sang-Man,Lee, Young-Hie,Nam, Sung-Pil,Lee, Sung-Gap 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.7
[ $(Ba_{0.57}Sr_{0.33}Ca_{0.10})TiO_3$ ] (BSCT) powders, prepared by sol-gel method, were mixed with organic vehicle and the BSCT thick films were fabricated by the screen printing method. The structural and dielectric properties were investigated as a function of the $Yb_2O_3$ doping contents. As a result of the TG-DTA, exothermic peak was observed at around $670^{\circ}C$ due to the formation of the polycrystalline perovskite phase. All BSCT thick films showed the typical XRD patterns of a cubic polycrystalline structure. The average thickness of all BSCT thick films was about $70{\mu}m$. The grain size of the BSCT thick film doped with 0.7 mol% $Yb_2O_3$ was approximately $6.2{\mu}m$. The Curie temperature and relative dielectric constant at room temperature decreased with increasing $Yb_2O_3$ amount. Relative dielectric constant and dielectric loss of the specimen doped with 0.1 mol% $Yb_2O_3$ were 4637 and 19 % at Curie temperature, respectively.
박추환 ( Chu Hwan Park ),석왕헌 ( Wang Hun Seok ),김성민 ( Sung Min Kim ),박광만 ( Kwang Man Park ) 慶熙大學校 社會科學硏究院 2009 社會科學硏究 Vol.35 No.2
본 논문은 적소이론을 통해 방송시장에서 나타나고 있는 신규매체인 DMB와 IPTV와 디지털케이블TV간 경쟁구도를 분석하기 위해 기존의 선행연구를 통해 도출한 설문항목 20개를 리커드 5점 척도로 대학생 311명을 대상으로 시행한 설문값을 분석하였다. 그 결과 적소폭의 경우 '선택오락'차원에서 IPTV가 가장 높은 값을 가지고 있는 것으로 나타나 가장 이용자를 충족시키는 매체로 나타났다. 적소중복의 경우 '정보습득'이 DMB와 디지털케이블TV간에 상대적으로 낮은 값을 보임에 따라 이러한 동기를 가진 수용자들은 높은 경쟁구도로 발전됨을 보였다. 한편 '선택오락'차원에서 DMB와 디지털케이블TV간 적소중복 값이 높아서 편의성, 선택가능성의 동기를 가지는 수용자 간에 경쟁강도가 낮을 것으로 판단된다. 마지막으로 경쟁우월성의 경우 IPTV가 디지털케이블TV에 비해 '선택오락', '친교', '정보습득' 차원에서 우월한 것으로 나타났다. In this paper, we analyze the user survey results with the theory of Niche to study the media competition such as, IPTV, Digital CableTV, DMB, Mobile IPTV. The user survey was conducted with twenty questions from proceeding research papers on 311 university students. As a result, niche breadth of IPTV in 'the entertainment choice' was the highest, which said that IPTV satisfies users the best among all four media. niche breadth of Mobile IPTV was higher than DMB, which said that Mobile IPTV may be more preferred than DMB. The niche overlap of IPTV and Digital cable TV in 'habitual watching' was the lowest which said that IPTV and Digita cable TV would not be competitive in habitual watchers' market. In 'the entertainment choice' aspect, the niche overlap of DMB and Mobile IPTV was quite high, which said that DMB and Mobile IPTV would be competitive in the market of consumers who prefer convenient media choice. In the competitive superiority aspect, IPTV was superior than Digita lcable TV in the aspects of 'entertainment choice', 'sociality', 'information', and Mobile IPTV was superior than DMB in the same aspects but other two aspects.
박영복(Young Bok Park),김승만(Sung Man Kim),조재훈(Jae Hun Jo),이동기(Dong Ki Lee),김경원(Kyoung Won Kim),김도균(Do Gyun Kim),김종호(Jong Ho Kim),양회생(Hoe Saeng Yang),윤혜원(Hae Won Yoon),심재철(Jae Chul Sim) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.11
Between 1 and 2% of benign cystic teratomas undergo malignant transformation. This occurs most frequently in postmenopausal women, who account for only 10% of benign cystic teratoma. A wide variety of neoplasms arise in the mature tissues of otherwise benign teratomas. Of the malignancies arising in teratomas, squamous carcinoma is the most common (83%) with sarcomas accounting for 7%, adenocarcinoma and carcinoid tumors make up most of the others. The presentation in StageⅠ disease does not differ from that of benign cystic teratoma, except that ascites is occasionally present. In the more advanced neoplasms, the symptoms are those of epithelial ovarian cancer of the same stage. Differential diagnosis between squamous cell carcinoma and benign mature teratoma is difficult but seems to be related to age, size, serum tumor marker (SCC, CA125, CEA). Prognosis of squamous cell carcinoma in mature cystic teratoma was reported much poorer than other epithelial ovarian cancers. In the early stages, treatment is possible through surgical intervention alone, but when advanced, 5 year survival rate shows less than 15 percent. We experienced two cases of squamous cell carcinoma of ovary arising in mature teratoma and present with a brief review of literature.
기후변화 바탕으로 한 다중수원 Water Blending 및 수처리 플랜트 최적화
박한배 ( Han Bai Park ),임성일 ( Sung Il Lim ),이유리 ( Yu Ri Lee ),이종만 ( Jong Man Lee ),이학수,우달식 ( Dal Sik Woo ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.2
Rapid climate change by global warming effects has frequently affected intake water qualities in water treatment process. This study evaluated a coagulant reduction method using multiple water resource blending. In normal conditions defined by turbidity 0-25NTU, TOC 0-8mg/L, and NO3-N 1-8mg/L, PASC dose of 15mg/L was determined based on the jar test and the pilot test. While insufficient water quantity or degradation of water quality was measured, ground water was blended a front or back of sandfilter to satisfy water quality and quantity. In emergency condition defined by turbidity 25-400NTU, TOC over 8mg/L, NO3-N over 8mg/L, pH 6.5-8.0, and TDS over 100 mg/L, the coagulant dose was determined 17.4mg/L at turbidity 100NTU, 23.2mg/L at 130NTU and 29mg/L at 150NTU. From over 400NTU, coagulant dose did not degrade water quality enough for sandfiltration. By that point, ground water was blended in the blending tank in order to reduce water contaminant levels. All results were satisfied with quality purpose of drinking water production.
토마스 하디의 『비운의 주드』에 나타난 사회부적응 문제 고찰
박상만 ( Park Sang-man ) 대한영어영문학회 2008 영어영문학연구 Vol.34 No.2
This thesis aims to investigate the aspects of social inadaptability in Jude the Obscure. This work really develops into a battle between reality and ideal. The hero Jude is confronted with ruin by the struggle between Arabella for physical sexuality and Sue for spiritual one. Jude the Obscure, one of the best works in the Victorian Age, shows the aspects of his gloomy and deterministic viewpoint. In this work, The hero Jude seeking for social success arrives at the downfall in the end due to his burning desires that he tries to get over social problems. However, Jude’s characteristic weakness, strong sexual impetus, and habitual drinking cause the hero to destroy his life. In this work, Hardy indicates the structural contradiction regarding education, marriage, and religion problems in the Victorian age. Hardy deals with inner problems of human beings oppressed by the convention of the time. Jude attempts to live his life according to his own nature, rejecting social convention. In the work, Jude continues to struggle against his life to the end, and finally the hero Jude is destroyed by the social inadaptability. We can feel venerable as we see Jude fight against Fate to the end in spite of his character defects. Therefore, we can reach the conclusion that Hardy’s literature creates the lofty beauty of men’s spirit. (Wonkwang University)
박종만,김대식,김성룡,Park, Joung-Man,Kim, Dae-Sik,Kim, Sung-Ryong 한국접착및계면학회 2003 접착 및 계면 Vol.4 No.1
Micromechanical 시험법과 표면 젖음성 측정을 이용하여 플라즈마 처리된 생분해성 poly(p-dioxanone) (PPDO) 섬유강화 poly(L-lactide) (PLLA) 복합재료의 계면물성과 미세파괴 분해메카니즘을 연구하였다. PPDO 섬유강화 PLLA 복합재료는 장기간의 사용기간 동안 우수한 기계적 물성을 제공할 수 있다. PPDO 섬유와 PLLA 기지재료의 분해정도는 열분석과 광학적인 관찰을 통해서 확인하였다. PPDO 섬유와 PLLA 기지재료 사이의 계면전단강도와 접착일은 플라즈마 처리 시간이 60초 일때 가장 컸으며, 접착일과 polar 표면자유에너지는 계면전단강도와 비례하였다. 초기상태의 PPDO 섬유는 연성파단 형상이 나타났으나, 분해시간이 진행됨에 따라 분자량 감소로 인해 점차적으로 취성 파단 형상으로 변하였다. 계면물성과 미세파괴 분해메카니즘은 분해가 진행됨에 따라 변하기 때문에 섬유강화 생분해성 복합재료의 성능을 조절하는데 중요한 요인들이다. Interfacial properties and microfailure degradation mechanisms of the oxygen-plasma treated biodegradable poly(p-dioxanone) (PPDO) fiber/poly(L-lactide) (PLLA)composites were investigated for the orthopedic applications as implant materials using micromechanical technique and surface wettability measurement. PPDO fiber reinforced PLLA composite can provide good mechanical performance for long hydrolysis time. The degree of degradation for PPDO fiber and PLLA matrix was measured by thermal analysis and optical observation. IFSS and work of adhesion, $W_a$ between PPDO fiber and PLLA matrix showed the maximum at the plasma treatment time, at 60 seconds. Work of adhesion was lineally proportional to the IFSS. PPDO fiber showed ductile microfailure modes at We initial state, whereas brittle microfailure modes appeared with elapsing hydrolysis time. Interfacial properties and microfailure degradation mechanisms can be important factors to control bioabsorbable composites performance because IFSS changes with hydrolytic degradation.