패각-주조분진-전로슬래그 조합물의 시멘트 클링커 생성거동에 관한 연구

천성민,송태웅 한국세라믹학회 2003 한국세라믹학회지 Vol.40 No.12

포틀랜드 시멘트의 조성범위가 되도록 한 패각-주조분진-전로슬래그계 조합물의 클링커 소성성과 시멘트 광물 생성거동에 대하여 광물상과 미구조 관찰을 중심으로 연구하였다. 이 조합물은 원료의 특성상 융액 생성이 용이하여 시멘트 클링커는 일반 천연 원료를 사용한 경우에 비하여 10$0^{\circ}C$ 정도 낮은 온도에서 생성된다. 조합물 내의 유리산화칼슘은 135$0^{\circ}C$ 이하에서 완전히 소멸되며 alite나 belite와 같은 시멘트 주광물의 합성은 140$0^{\circ}C$ 이하의 온도에서 과다한 유리상의 생성이 없이 완료된다. The mixtures which are in the chemical composition of Portland cement were prepared from oyster shell, casting dust and BOF slag. The clinkerbility and the behaviour of formation of clinker minora]s were studied using the mixtures mainly by the mineral and microstructural observation. By virtue of the characteristics of starting raw materials, the clinkering temperature was lower as much as 100$^{\circ}C$ than that of a mixture prepared from normal raw materials. Uncombined calcium oxide was vanished entirely below 1350$^{\circ}C$. and the formation of major cement minerals such as alite and belite could be nearly accomplished without too much liquid phase within 1400$^{\circ}C$.

교양체육 참가자의 재미와 생활만족, 취업스트레스의 관계

천성민 인하대학교 교육연구소 2023 교육문화연구 Vol.29 No.1

This study investigated the relationship between enjoyment, life satisfaction, and employment stress of students participating in liberal arts and physical education. Participants were 165 third and fourth grade students taking liberal arts and physical education classes at universities located in Gyeonngi-do and Seoul. SPSS 26.0 and AMOS 21.0 statistical programs were used to conduct confirmatory factor analysis, internal consistency coefficient calculation, and correlation analysis for measurement tools, and path analysis for measurement models. The results are as follows. First, the enjoyment of liberal arts physical education participants had a positive (+) effect on life satisfaction. Second, life satisfaction of liberal arts physical education participants had a negative (-) effect on job-seeking stress. Third, life satisfaction of liberal arts physical education participants completely mediated the relationship between enjoyment and job stress. Thus, although there is limited enjoyment of participating in liberal arts physical education that directly affects students’ job-seeking stress, the increased life satisfaction through sports activities can reduce students' job-seeking stress.

급성 A형 간염 후에 발생한 정중신경병증 - 증례 보고-

천성민,이구주,김혜리,홍준범,임재영 대한근전도전기진단의학회 2010 대한근전도 전기진단의학회지 Vol.12 No.2

A 29-year-old woman with a history of preceding acute hepatitis A infection visited outpatient clinic. She complained of weakness of left finger flexor and tingling sense of both upper extremities, eleven weeks ago. Median neuropathy with partial axonotmesis state was diagnosed by the neurologic examination and electrophysiological studies. Her symptoms improved but she had remnant weakness of finger which disturbed the movement of pinch and grasp. This case reminds us to include mononeuritis such as median neuropathy as a rare sequela of acute hepatitis A infection.

The Significance of MicroRNA Let-7b, miR-30c, and miR-200c Expression in Breast Cancers

천성민,박희정,김철환,김인선 대한병리학회 2011 Journal of Pathology and Translational Medicine Vol.45 No.4

Background: MicroRNA (miRNA) is a class of noncoding protein RNA as a promising biomarker for various diseases. In this study, the expression of let-7b, miR-30c, and miR-200c was studied in breast cancer tissues to evaluate the potential relationship with known clinicopathological parameters. Methods: Quantitative real-time polymerase chain reaction was performed to determine the expression level of three miRNAs in 37 pairs of noncancerous normal and cancer tissues and an additional 38 cancer tissues from patients with invasive ductal carcinoma. Results: miR-200c expression was higher in cancer tissues compared to noncancerous normal tissues, and its ratio was correlated with patient age at surgery, type of surgery, and Ki-67 expression. The expression level of let-7b in cancer tissues was inversely correlated with lymph node metastasis, histological grade, and Ki-67 expression but positively correlated with estrogen and progesterone receptor expression. miR-200c expression level was positively correlated with Her-2 expression. The miR-30c expression level in breast cancer was not correlated with any parameters. Conclusions: miR-200c and let-7b could be used as biomarkers in patients with breast cancer, but its pathological mechanism should be determined.

슈퍼셀 일카 파나넨 대표에게 보내는 공개 서한

천성민 한국게임정책자율기구 2019 게임이용자보호와 자율규제 Vol.- No.3

가치 탐구 학습 모형의 적용 2

천성민 광주초등국어교육학회 2000 광주초등국어교육연구 Vol.4 No.1

폐기물만을 원료로 한 포틀랜드시멘트 클링커의 합성과 특성에 관한 연구

천성민,송태웅 한국시멘트협회 2003 시멘트 심포지움 Vol.30 No.-

테니스 참가자의 스포츠 전념이 활력과 생활만족에 미치는 영향

천성민,도무환 한국코칭능력개발원 2023 코칭능력개발지 Vol.25 No.1

본 연구는 테니스 동호인의 운동참가 정도에 따른 스포츠 전념, 활력, 생활만족의 차이를 알아보고, 스포츠 전념이 활력이나 생활만족에 어떠한 영향을 미치는가를 알아보는 데 목적이 있다. 연구대상은 2022년 강원도지사기 테니스 대회에 참가한 테니스 동호인 240명이었으며, 이중 불성실하게 응답한 자료 9부를 제외한 231부의 자료를 분석에 활용하였다. SPSS 26.0과 AMOS 21.0 통계프로그램을 활용하여 측정도구에 대한 확인적 요인분석과 내적일관성계수를 산출하였으며, 일원배치분산분석과 상관관계분석 및 단계적 회귀분석을실시하였다. 이를 통한 결과는 다음과 같다. 첫째, 테니스 참가자의 주당 운동참가 횟수가 높을수록 스포츠 전념과 활력, 생활만족도가 높아지는 것으로 나타났다. 둘째, 테니스 참가자의 스포츠 전념과 활력, 생활만족의 모든 하위요인들 간에는 정(+)적 상관이 나타났다. 셋째, 스포츠 전념의 하위요인 중 인지몰입은 활력에 정(+)적인 영향을 미치는 것으로 나타났다. 넷째, 스포츠 전념의 하위요인(인지몰입, 행위몰입)은 환경만족에 정(+)적인 영향을 미치는 것으로 나타났다. 다섯째, 스포츠 전념의 하위요인 중 인지몰입은 사회만족에 정(+)적인 영향을 미치는 것으로 나타났다. 여섯째, 스포츠 전념의 하위요인(인지몰입, 행위몰입)은 심리만족에 정(+)적인 영향을 미치는 것으로 나타났다. 결론적으로 테니스에 전념하는 것은 일상생활(활력, 생활만족)을 긍정적으로 영위할 수 있게 만들어주기 때문에 테니스 참가자가 더욱 테니스에 빠져들고 재미를 느낄 수 있도록 환경을 구축할 필요가 있다.

Hydration Behavior of Manufactured Ordinary Portland Cement Using Cement Paste Powder of the Waste Concrete

천성민,안지환,유광석,한기천,조희찬 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1

In this study, hydration behavior of Manufactured Ordinary Portland cement using fine powder byproducts through treatment of waste concrete. The fine powder produced by heating and grinding of the waste concrete in the waste construction was utilized as substitution raw materials of SiO2, CaO, and Al2O3 source for OPC clinker manufacture. In order to synthesize OPC clinker, limestone, shale, converter slag and fly ash were used as main raw materials. And the modulus was fixed LSF 91.0, SM 2.60, and IM 1.60. The main products of synthesized clinker in this study were C3S, ß-C2S, C3A, C4AF as OPC clinker at 1,450℃. As a result of TG-DTA and burnability (B.I) analysis of each raw mixtures, the formation temperature of clinker phases was similar and burnability of clinker synthesized was showed easy burning. And the manufactured OPC utilizing fine cement paste powder hydrated as similar to that of OPC.

우수 운동선수의 슈퍼심리기술 형성과정과 특성

천성민,김병준 한국스포츠심리학회 2019 한국스포츠심리학회지 Vol.30 No.1

Purpose: The purpose of this study was to investigate the development and characteristics of super psychological skills in elite athletes who play their own play without psychological fluctuation in the game situation. Methods: In order to understand the development and characteristics of super psychological skills in elite athletes, grounded theory was used. Six elite athletes were selected through reputational-case selection. Data were collected, utilizing in-depth discussion and audiovisual materials. Results: The process of forming super psychological skills in elite athletes was composed of 80 concepts, 33 subcategories, and 14 categories. ‘starting to exercise’ was derived from a category that corresponds to casual condition of development of elite athletes’ super psychological skills. ‘Flow’, ‘confirming the talent’ and ‘experiencing frustration’ were derived from the contextual condition. ‘Strong confidence’, ‘growth needs’ and ‘self-examination’ were derived from central phenomenon, and ‘positive support’, ‘experiencing slump’ and ‘importance of psychological skills’ were derived from arbitrational condition. ‘BIG 7 psychological method’, ‘crisis coping’ and ‘deliberate practice’ were derived from action/interaction strategy; ‘SUPER 5 psychological skills’ was ultimately derived. The psychological skills that appeared in the process of forming super psychological skills of elite athletes showed ‘infinite confidence’, ‘total concentration’, ‘optimistic attitude’, ‘not focusing on results’ and ‘enjoyment of the process’. In addition, the psychological method were shown as ‘imagery’, ‘process cue’, ‘simulation training’, ‘positive self-talk’, ‘positive attribution’, ‘coping with anxiety’, and ‘condition management’. This was named ‘SUPER 5 psychological skills’ and ‘BIG 7 psychological method. Conclusion:: For athletes who cannot perform their best because of psychological problems, super psychological skills in elite athletes provide important information. More research on psychological skills to improve athletes’ performance is needed.