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청소년의 수면 문제가 내재화 및 외현화 문제행동에 미치는 영향과 정서조절곤란의 매개효과
정윤교,박미연,이지혜,김현경,주수산나 한국심리학회 산하 한국발달심리학회 2023 한국심리학회지 발달 Vol.36 No.3
This study examined the extent to which sleep problems influenced internalizing and externalizing problems directly or indirectly through emotion dysregulation among adolescents. The sample comprised 5,454 adolescents (2,586 girls, 10-14 years old) drawn from the 4th wave of the Adolescent Brain Cognitive Development Study (ABCD study 2019-2021) conducted by the National Institutes of Health (NIH). The findings of path analysis indicated that higher levels of sleep problems were significantly and positively associated with emotion dysregulation, internalizing, and externalizing problems. In addition, higher levels of emotion dysregulation significantly mediated the effects of sleep problems on internalizing and externalizing problems. The findings indicate that addressing sleep problems and improving emotion regulation skills can be effective ways for preventing internalizing and externalizing problems among adolescents who are vulnerable to sleep issues.
정윤교,조종래,윤상대,김남경 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
This polishing machine has many advantages to polish complicated shaped molds due to spindle header with constant pressure. But, because of new polishing machine, there is no study of the standardization of polishing by polishing conditions yet. So we want to know the relation between polishing conditions(a kind of tool, grain size) and surface roughness. The result of experimental was obtained surface roughness of 0.061㎛ Ry in case of using wood tool and grain of 6㎛ diamond.
정윤교 國立 昌原大學校 産業技術硏究所 1994 産技硏論文集 Vol.8 No.-
The application of advanced ceramics as a substitute for classical is increasing because of their excellent properties. It is, however, not easy to grind these materials because they are strong, hard and brittle. In this study, representative advanced ceramics are ground and grinding mechanism is discussed in terms of the grinding force, grinding energy and surface roughness. The depth of the residual crack after grinding and critical grain load is estimated on the basis of the indentation theory. Furthermore, the propriety for results obtained is investigated by observation of a grinding profile.
스크류유량계 개발에서의 역공학 및 성능평가에 관한 연구
정윤교,황종대,정종윤,이상렬 한국기계가공학회 2005 한국기계가공학회지 Vol.4 No.2
This research presents a modeling and a manufacturing method of screw flow meter. This paper introduces the efficient design and manufacturing method of screw type flow meter using reverse engineering and test technology. The methods introduced this paper utilize the reverse engineering that is increasing accuracy of modeling and manufacturing of reverse model. And then it can be used in performance test with hydraulic test equipment. Hence this can be used in the basic document for development of the quite accurate flowmeter.
정윤교,김남우,문병준,芝田勳 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
Recently, new polishing tool which was made by magnetic intelligent compound(Magic) was invented. The distribution of abrasives in this new tool can be controlled by magnetic field. Therefore, we can make a special polishing tool which has well arranged abrasives after cooling. In this study, 3 dimensional polishing machine was developed in order to polish complicated - shaped inner surfaces of molds. The performance of developed machine was investigated by measuring the roughness of polished surface using new polishing tool.
PSf-co-PPSS/HPA를 이용한 수소제조 수전해용 고체 고분자 전해질 복합 막의 제조
정윤교,황갑진,배기광,심규성,강안수,이혁재,장인영 한국수소및신에너지학회 2005 한국수소 및 신에너지학회논문집 Vol.16 No.2
Proton conducting solid polymer electrolyte (SPE) membranes have been used in many energy technological applications such as water electolysis, fuel cells, redox-flow battery, and other electrochemical devices. The availability of stable membranes with good electrochemical characteristics as proton conductivity at high temperatures above 80 and low cost are very important for its applications. However, the presently available perfluorinated ionomers are not applicable because of high manufacturing cost and high temperature use to the decrease in the proton conductivity and mechanical strength. In order to make up for the weak points, the block copolymer (BPSf) of polysulfone and poly (phenylene sulfide sulfone) were synthesized and sulfonated. The electrolyte membranes were prepared with phosphotungstic acid (HPA)/sulfonated BPSf via solution blending. This study would be desirable to investigate the interaction between the HPA and sulfonated polysulfone. The results showed that the characteristics of SPSf/HPA blend membrane was a better than Nafion at high temperature, 100 . These membranes proved to have a high proton conductivity, 6.29 10-2 S/cm, a water content, 23.9 %, and a ion exchange capacity, 1.97 meq./g dry membrane. Moreover, some of the membranes kept their high thermal and mechanical stability.