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박성혁,이태경,임상훈,이종수 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.6
Variation in the microstructure and tensile properties with the warm drawing strain and subsequent annealing of0.45 wt% C (45C) medium-carbon steel and 0.82 wt% C (82C) high-carbon steel was investigated. The morphologyand size of ferrite and pearlite changed considerably with applied strain during drawing and with annealingtemperature and time, which made the tensile properties of the drawn steels vary considerably. With increasingdrawing strain to ~2.5, the yield strength increased significantly from 393 to 1332 MPa for the 45C steel and from673 to 1876 MPa for the 82C steel; this was attributed mainly to the strain hardening caused by severely deformedferrite and/or enhanced particle hardening caused by cementite segmentation. During annealing of heavily drawnsteels, ferrite grain growth and coarsening of broken cementite particles occurred simultaneously, which causedeffective recovery of the ductility of severely drawn steels. These results demonstrate that the tensile strength andelongation of medium- and high-carbon steel wires can be tuned considerably by controlling the extents of drawingand annealing, thereby widening their applicability and facilitating their manufacture to match their mechanicalproperties to each application.
박성혁,김하식,유봉선 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.2
This paper analyzed the relationships between the extrusion conditions, grain size, and yield strength of anMg-7Sn-1Al-1Zn alloy, which was extruded at different initial billet temperatures and ram speeds, anddeveloped empirical models to predict the grain size and yield strengths. The results revealed that grainsize increases as the extrusion temperature and ram speed increase, resulting in a decrease of the tensileand compressive yield strengths due to reduced effect of grain boundary strengthening. It was also foundthat the exit temperature is a key determinant of grain size and yield strength, i.e. as the exit temperaturedecreases, the grain size decreases while the tensile and compressive yield strengths increase. The grain sizeand yield strength prediction models, which provide results as a function of temperature and strain rate,were developed by considering the extrusion temperature and speed dependencies of the exit temperature,and the predicted results showed a good agreement with the experimental data.
인권교육의 사적발달과 초등 사회과 인권 교육의 원리에 관한 연구
박성혁 全州敎育大學校 初等敎育硏究所 2001 初等敎育硏究 Vol.12 No.-
After World War Ⅱ, human-rights education was emphasized in not only all grades of school education but also every education, but in Korea, human-rights education was deemphasized in secondary social studies, at most treated as sub-content in social studies, what is worse, human-rights education was not treated in elementary social studies at all. Fortunately, human-rights education will be introduced in 7th curriculum of elementary social studies for the first time, from now on, if human-rights education in elementaty social studies be fruitful, special regard be paid to cognitive developmental context of learners and social-cultural context of learning content.
박성혁 전북초등사회과교육학회 2001 초등사회과교육논총 Vol.3 No.-
After World War II, human-rights education was emphasized in not only all grades of school education but also every social education. but in Korea, human-rights education was deemphasized in secondary social studies, at most treated as sub-content in social studies, what is worse, human-rights education was not treated in elementary social studies at all. Fortunately, human-rights education will be introduced in 7th curriculum of elementary social studies for the first time, from now on, if human-rights education in elementary social studies be fruitful, special regard should be paid to cognitive developmental context of learners and social-cultural context and context of learning content.
A Strategy Bayesian Model to Predict Profit of Construction Projects
박성혁,김상용 대한건축학회 2011 Architectural research Vol.13 No.3
Competitive bidding in construction is concerned with contractors making strategic decisions in respect of determination of bid price if contractors opt to bid. This study presents a strategy model for deciding optimum tender price with reflecting appropriate profit in competitive bidding using Bayesian regression analysis (BRA). The purpose of the developed model is to help contractors to secure suitable profitability by predicting the actual profit based on key variables. They may affect construction cost at bidding phase, ultimately which help contractors to secure high quality output. The model was tested empirically by application to a bidding dataset collected from a large South Korea contractor. BRA allows contractors to estimate more accurate actual profit by reflecting not only objective information but also subjective experiences and judgments. Consequently, the model can contribute to improvement of decision-making process for setting an optimum tender price.
위암 환자의 수술 전 림프절 전이 평가를 위한 PET-CT의 진단적 유용성
박성혁,조민수,류훈,배금석,김익용,김대성,Park, Sung-Hyuk,Cho, Min-Su,Ryu, Hoon,Bae, Keum-Seok,Kim, Ik-Yong,Kim, Dae-Sung 대한위암학회 2008 대한위암학회지 Vol.8 No.4
목적: PET-CT가 림프절 전이를 발견하는데 있어 그 정확도를 조사하여 수술 전 진단 도구로써의 유용성을 평가하였다. 대상 및 방법: 2006년 6월부터 2008년 7월까지 원주기독병원에서 위암으로 수술 전 복부(위)전산화단층촬영술 및 PET-CT를 시행 후 근치적 위절제술을 시행한 환자를 대상으로 복부(위)전산화단층촬영술과 PET-CT의 민감도, 특이도, 양성예측률, 음성예측률 그리고 정확도를 비교 평가하였다. 결과: 전체 119명의 PET-CT의 민감도는 32.6%, 복부(위)전산화단층촬영술의 민감도는 39.5%였다. 특이도는 PET-CT 86.8%였으며 복부(위)전산화단층촬영술은 76.3%였다. 양성예측률은 PET-CT 58.3%, 복부(위)전산화단층촬영술 48.6%, 음성예측률은 PET-CT 69.5%, 복부(위)전산화단층촬영술 69.0%였다. 정확도는 PET-CT 67.2%, 복부(위)전산화단층촬영술 63.0%였다. 조기 위암의 경우 PET-CT와 복부(위)전산화단층 촬영술의 특이도는 98.0%와 88.2%, 음성예측률 80.6%와 80.4%, 정확도 67.2%와 63.0%이었다. 진행성 위암인 경우에는 PET-CT와 복부(위)전산화단층촬영술의 민감도는 45.2%와 51.6%, 특이도 64.0%와 52.0%, 양성예측률 60.9%와 57.1%, 음성예측률 48.5%와 46.4%, 정확도 53.6%와 51.8%였다. 결론: 수술 전 PET-CT를 이용한 림프절 전이 여부 평가는 복부(위)전산화단층촬영술에 비해 치료 지침을 결정하는데 더 많은 도움을 줄 수 있을 것으로 사료된다. Purpose: The purpose of this study was to assess the diagnostic value of 18F-fluorodeoxyglucose positron emission tomography/computed tomography (FDG-PET/CT) for detecting the lymph node (LN) metastasis of gastric cancer. Materials and Methods: 119 patients (M : F=89 : 30; mean age: 64) with gastric cancer were referred for preoperative FDG-PET/CT scanning and spiral enhanced abdominal pelvic CT from June 2006 to July 2008, and these were the subjects of our study. All the patients underwent curative radical gastrectomy and lymph node dissection. A final diagnosis was made for all the patients by the histology of the surgical specimens. Results: Both PET/CT and enhanced CT showed similar sensitivity for detecting regional lymph node metastasis (32.6% vs 39.5%, respectively). PET/CT was more accurate than enhanced CT for detecting regional lymph node metastasis (67.2% vs 63.0%, respectively), and PET/CT showed better specificity (86.8% vs 76.3, respectively) and a better positive predictive value (PPV) (58.3% vs 48.6%, respectively). PET/CT showed better specificity (98.0% vs 88.2%, respectively) and accuracy (79.4% vs 73.9%, respectively) than enhanced CT for detecting early gastric cancer. PET/CT showed better specificity (64.0% vs 52.0%, respectively), a better PPV (60.9% vs 57.1%), a better negative predictive value (NPV) (48.5% vs 46.4%, respectively) and better accuracy (53.6% vs 51.8%, respectively) than enhanced CT for detecting advanced gastric cancer. Conclusion: FDG-PET/CT is more usefulness than enhanced CT for making the preoperative diagnosis of regional LN metastases from gastric cancers.
긍정적 평가에 대한 두려움이 사회불안 증상에 미치는 영향: 긍정적인 사회적 결과에 대한 평가절하와 자기개념의 편향된 활성화의 순차적 이중매개 효과
박성혁,안정광 한국인지행동치료학회 2021 인지행동치료 Vol.21 No.4
This study has investigated the relationship between fear of positive evaluation and social anxiety symptoms, considering the sequential mediating effect of disqualification of positive social outcome and biased activation of self-concept. 220 adults had conducted survey including Fear of Positive Evaluation Scale (FPE), Disqualification of Positive Social Outcome Scale (DPSO), Social Interaction Self-Statement Test, Social Phobia Scale (SPS), and Social Interaction Anxiety Scale (SIAS) all in Korean version. The biased activation of self-concept was assessed as SISSTT, sum of reversed SISSTP, positive self-statement in social situation, and SISSTN, negative self-statement in social situation. The statistical analysis was performed with Jamovi version 1.2. The major findings of this study are as follows. First, FPE, DPSO, SISSTT, SIAS, SPS are all significantly correlated in positive direction with moderate size. Second, the sequential dual mediating effect of DPSO and biased activation of self-concept between FPE and social anxiety symptoms was significant. Third, single indirect effect of DPSO between FPE and social anxiety symptoms in performance situation. From these results, we can identify important variables of positivity-deficits in social anxiety and how it is related to social anxiety symptoms. We also discussed sociocultural and clinical implications. Future researches should consider more strict grouping criteria, also disorder-or-symptom-specific factors and sociocultural context of emotion regulation, which might enrich our understanding of social anxiety. 본 연구에서는 사회불안의 인지 양상 중 긍정적 평가에 대한 두려움과 사회적 상호작용 상황에서의 사회불안 증상, 긍정적 평가에 대한 두려움과 사회적 수행 상황에서의 사회불안 증상 간의 관계에서 긍정적인 사회적 결과에 대한 평가절하, 사회적 상황 내에서 활성화되는 편향된 자기개념이 순차적 이중매개 효과를 갖는지를 각각 검증하고자 하였다. 이를 위해 18세 이상의 성인 220명을 대상으로 긍정적 평가에 대한 두려움 척도, 긍정적인 사회적 결과의 평가절하 척도, 편향된 자기개념의 활성화 정도를 측정하는 사회적 상호작용에 대한 자기 진술 검사, 사회불안 증상을 측정하는 한국판 사회적 상호작용 불안 척도와 한국판 사회공포증 척도 등을 사용하여 설문조사 하였다. 연구 참가자 모집과 설문 작성은 모두 온라인상에서 진행되었다. 상기의 변인들은 모두 유의한 상관을 보였다. 이중매개 분석 결과, 긍정적 평가에 대한 두려움은 사회적 상호작용 상황과 수행 상황에서의 사회불안 증상의 유지 및 심화에 각각 영향을 미칠 수 있음이 확인되었다. 또한, 긍정적인 사회적 경험에 대한 평가절하가 상황 내에서 편향된 방식의 자기개념을 활성화 시키는 방식으로 그 관계를 매개할 수 있음이 확인되었다. 또한, 사회적 수행 상황을 포함하는 순차적 이중매개 모형에서 긍정적인 사회적 결과에 대한 평가절하의 단독매개 효과도 유의하였다. 본 연구 결과를 통해 사회불안 증상의 유지 및 심화에 중요한 변인들을 파악할 수 있으며, 정서의 사회적 기능과 문화적 맥락에 주목할 필요성을 확인할 수 있다. 이는 사회불안에 대한 이해를 확장하는 것을 돕고 임상적 개입에 새로운 초점을 제공할 수 있을 것이라 생각된다. 향후에는 보다 엄격한 집단 구분을 바탕으로 장애 및 증상-특수성과 사회문화적 맥락을 고려한 정서조절 전략을 분석한다면 사회불안에 대한 이해가 더욱 깊어질 수 있을 것이다.