대학입학사정관제에 대한 고등학생들의 인식 조사

윤서현(Seo Hyun Yun) 한국지방교육경영학회 2015 지방교육경영 Vol.18 No.2

본 연구는 대입에 직면해 있는 고3 학생이 입학사정관제를 어떻게 인식하고 있는지에 대해 알아보고, 입학사정관제도의 운영, 효과 및 개선방안 인식 차이를 확인하고 이를 통해 시사점을 탐색해보는데 목적이 있다. 입학사정관제도(학생부종합전형)의 도입목적과 취지, 장.당점, 전형내용 및 절차에 대한 인식의 정도는 전반적으로 보통으로 나타났다. 성별 간, 계열 간 유의미한차이는 없는 것으로 나타났지만, 입학사정관제의 전형내용 및 절차에 따른 이해정도는 아버지의 학력과 소득 수준에 따라 이해도가 높아지는 것으로 나타났다. 입학사정관제의 전형방법에 대한 만족도, 평가방법의 공정성, 입학사정관에 대한 신뢰성에 대한 인식의 정도는 전반적으로 ‘그렇지 않다’ 이하인 것으로 나타났고, 부정입학에 대한 우려에 대해서는 ‘그렇다’ 이상인 것으로 나타났다. 대체로 유의미한 차이를 보이지 않았으나, 부정입학에 대한 우려와 입학사정관에 대한 신뢰성 부분에서는 어머니의 학력과 소득 수준에 따라 유의미한 차이를 보이는 것으로 나타났다. 잠재력 향상 효과를 제외한 입학사정관제의 교육적 효과에 대해 사교육비의 감소, 고교서열화 및 불균형 완화, 잠재력 향상, 입시부담 감소, 고등학교 교육의 충실도에 대해 전반적으로 ‘그렇지 않다’ 이하인 것으로 나타났다. 성별 간 분석 결과 여학생보다 남학생의 경우 교육적 효과에 더 부정적으로 인식하는 것으로 나타났다. 부모 학력에 따른 분석 결과는 대체적으로 유의미한 차이를 보이지 않았으나, 사교육비 감소에 대한 인식 차이에 대해 어머니 학력에 따라 통계적으로 유의미한 차이를 보였다. 복수채점과 전형 확대의 필요성에 대해 대체로 ‘그렇다’ 이하인 것으로 나타났다. The purpose of this study was to examine the awareness of college- bound high school seniors about the admissions officer system and any possible differences in their awareness about the management and effect of this system and workable reform measures in an effort to make some suggestions about the admissions officer system. The students took a moderate view of the goal, intent, strengths, weaknesses, content and procedure of the admissions officer system in general. There were no significant differences according to gender and track, but the students whose fathers were better educated and/or larger income earners had a better understanding of the content and procedure of the system. As for satisfaction level with the screening process of the admissions officer system, the impartiality of the evaluation methods and the trustworthiness of admissions officers, they replied, "I don``t think so," or gave more negative answers. Concerning fear for illicit admission, they replied, "Yes," or gave more positive answers. There were no significant differences, but significant differences were found in fear for illicit admission and the trustworthiness of admission officers according to the academic credential of their mothers and income level. Regarding the educational effects of the admissions officer system except for the improvement of potentials, they replied, "I don``t think so," or gave more negative answers to the questions about the effects of the system on decreasing private education expenses, weakening high school ranking and inter-school imbalance, improving potentials, relieving pressure for college entrance and enriching high school education. When their opinions were compared by gender, the boys had lower opinions on the educational effects of the system than the girls. When the academic credential of their parents was taken into account, there were no significant differences according to that, but they had statistically significantly different opinions on the effect of reducing private education expenses according to the academic credential of their mothers. As to the necessity of the acceptance of multiple answers and that of the expansion of the admissions officer system, they replied, "Yes," or gave negative replies.

육계에서 품종 및 사육 밀도가 생산성 및 생리적 적응성 지표에 미치는 영향

장인석,윤서현,고영현,김세윤,송민혜,김종선,손시환,문양수,Jang, In-Surk,Yun, Seo-Hyun,Ko, Young-Hyun,Kim, Se-Yun,Song, Min-Hye,Kim, Jong-Sun,Sohn, Sea-Hwan,Moon, Yang-Soo 한국가금학회 2014 韓國家禽學會誌 Vol.41 No.3

본 실험은 육계 품종(Ross vs. Cobb) 및 사육 밀도(표준 밀도구, $0.046m^2$/수 vs. 고밀도구, $0.023m^2$/수)가 생산성, 장기무게, 혈액 corticosterone, 친염증 사이토카인과 항산화 효소의 mRNA 발현에 미치는 영향을 조사하기 위해 실시하였다. 전체 사육 기간 동안 품종에 따른 생산성 지표들은 차이가 없었으나, 사육 밀도에 따른 사양 성적은 두 품종 모두 고밀도 사육구(HD)에서 표준 밀도구(SD)에 비해 체중과 사료 섭취량이 유의적으로 감소하였다(P<0.05). 간과 비장의 상대적 무게는 품종에 따른 유의적 차이가 나타났으나(P<0.05), 사육 밀도에 따른 차이는 없었다. 혈액 corticosterone 농도는 품종 및 사육 밀도에 따른 통계적 차이는 없는 것으로 나타났다. 육계 품종 및 사육 밀도에 따른 친염증 사이토카인과 항산화 효소의 mRNA 발현 양상으로 간 조직에서 이들 사이토카인(IL-$1{\beta}$, IL-6, IL-18 및 IFN-${\gamma}$) mRNA 발현은 품종과 사육 밀도에 따른 차이가 없었다. 한편, 항산화 유전자인 GPX mRNA 발현은 품종에 따라 현저한 반응의 차이를 보였으며(P<0.05), Ross 품종이 Cobb 품종보다 GPX mRNA 발현이 낮았다. 사육 밀도 요인에 따른 차이를 보면, SOD, GPX 및 CAT의 mRNA 발현이 모두 고밀도 사육구에서 현저히 증가되는 것으로 나타났다(P<0.05). 비장조직에서 대부분의 친염증 사이토카인은 품종 및 사육 밀도에 따른 차이가 없었으나, IL-18 mRNA 발현은 고밀도 사육 시 Cobb 종에서 발현이 감소되었다(P<0.05). 항산화 효소 mRNA 발현은 품종 및 사육 밀도 요인에 따라 SOD와 CAT에서 유의적 차이가 있었다(P<0.05). 이와 같은 결과로 보아 사양 성적은 육계 품종에 따른 요인에 영향을 받지 않았지만, 사육 밀도는 생산성을 감소시켰다. 친염증 사이토카인의 mRNA 발현은 품종 및 사육 밀도에 따른 차이는 적었으나, 항산화 효소는 품종, 사육 밀도 및 장기조직에 따른 발현의 차이가 나타나 체내 항상성 조절에 중요한 지표로서 지속적인 연구가 요구된다. The aim of this study was to determine the effects of stocking density and strain on the performance and physiological adaptive responses including the plasma corticosterone content and the level of mRNA expression of pro-inflammatory cytokines and antioxidant enzymes in broiler chicks. A total of 300 birds of two strains (150 Ross strain vs. 150 Cobb strain) aged 3-d old were allotted into two stocking densities (standard stocking density,$0.046m^2/bird$ vs. high stocking density, $0.023m^2/bird$) in battery cages by $2{\times}2$ factorial designs with ten replicates until 35 d of age. There was no significant strain effect on body weight, feed intakes and feed to gain ratio and the relative organ weights. However body weight, feed intakes and relative organ weight were found to be significantly (P<0.05) affected by the effect of stocking density. Plasma corticosterone level was not affected by both stocking density and strain effects. Hepatic mRNA expression of pro-inflammatory cytokines including interleukin-$1{\beta}$ (IL-$1{\beta}$), IL-6, IL-18 and interferon-gamma (IFN-${\gamma}$) was not significantly changed by the effects of strain and stocking density. However, the mRNA expression of glutathione peroxidase (GPX) was affected by strain, showing that Ross strain decreased (P<0.05) the GPX expression. With respect to the effect of stocking density, there was a significant (P<0.05) increase in superoxide dismutase (SOD) and catalase (CAT) and GPX mRNA expression in the liver from high stocking density group. Splenic pro-inflammatory cytokine expression was not also affected by stocking density and strain, except that IL-18 mRNA significantly (P<0.05) decreased in Cobb strain under high stocking density. The mRNA expression of SOD and CAT was significantly (P<0.05) affected by the effects of stocking density and strain. In conclusion, growth performance was not affected by strain but stocking density. Although mRNA expression of major pro-inflammatory cytokines was not changed by stocking density and strain, antioxidant enzyme was significantly affected by stocking density, strain or even organ in birds under summer conditions. More detailed studies still needed to be explored to elucidate the effects of environmental conditions and genetic background on physiological responses in birds.

커피박 첨가가 육계의 소장 효소 활성도, 생화학 지표 및 장내 미생물 균총에 미치는 영향

고영현(Young-Hyun Ko),윤서현(Seo-Hyun Yun),송민혜(Min-Hae Song),김세윤(Se-Yun Kim),김종선(Jong-Sun Kim),김현욱(Hyoun-Wook Kim),장인석(In-Surk Jang) 한국가금학회 2014 韓國家禽學會誌 Vol.41 No.2

레이저 및 초음파 피닝된 STS316L의 공식 부식에 관한 연구

구경희(Kyoung-Hee Gu),윤서현(Seo-Hyun Yun),남기우(Ki-Woo Nam) 대한기계학회 2022 大韓機械學會論文集A Vol.46 No.4

본 연구에서는 모재시험편, 초음파 피닝시험편, 레이저 피닝시험편을 FeCl3+HCl 용액에 침지하여 내공식성을 평가하였다. 초음파 피닝시험편은 초음파 해머핀의 충격에 의한 소성변형으로 표면 조직 입도가 작고, 깊이가 깊어질수록 모재의 조직 입도였다. 레이저 피닝시험편은 레이저 충격파에 의해 소성변형되었으나, 조직 입도의 크기 변화는 없었다. 모재시험편의 평균 비커스 경도는 약 153 HV, 초음파 피닝 및 레이저 피닝시험편의 표면 경도는 각각 약 290 및 250 HV였다. 세 가지 유형의 시험편에서 공식 부식이 관찰되었다. 레이저 피닝 및 초음파 피닝시험편은 모재보다 더 많은 공식 부식이 관찰되었다. The pitting resistance of as-received and laser and ultrasonically peened STS316L specimens was evaluated by immersion in FeCl₃ + HCl solution. The ultrasonically peened specimen had a smaller grain size owing to the plastic deformation caused by shocking induced via an ultrasonic hammer pin. However, the as-received grain size was observed at larger depths. The laser peening specimen was plastically deformed by the laser shock wave; however, no change in the grain size was observed. The average Vickers hardness of the as-received specimen was approximately 153 HV. The hardness values of the ultrasonically and laser peened specimens were approximately 290 and 250 HV, respectively. Pitting corrosion was observed for the three types of specimens. Notably, the laser and ultrasonically peened specimens exhibited a larger amount of pitting than that of the as-received specimen.

이중 쇼트 피닝에 의한 SCM822H 강의 무해화 균열 크기 평가

최진우 ( Jin-woo Choi ),윤서현 ( Seo-hyun Yun ),권영국 ( Yung-kug Kwon ),이금화 ( Gum-hwa Lee ),남기우 ( Ki-woo Nam ) 한국산업융합학회 2023 한국산업융합학회 논문집 Vol.26 No.6

In this study, the harmless crack size (a_hml) by double shot peening (DSP) using shot balls with different diameters was evaluated on carburized, quenched-tempered SCM822H steel. The minimum crack size (a_NDI) detectable by non-destructive inspection was also evaluated. The relationship between the crack size (a_25,50) that reduces the fatigue limit by 25% and 50% and a_hml was evaluated. The residual stress of DSP was greater in SP(0.6+0.08) than SP(0.8+0.08) and appeared deeper in the depth direction. In addition, the hardness below the surface appeared larger. The fatigue limit of DSP increased 2.07 times and 1.95 times compared to non-SP. All a_hml of the DSP specimen was determined at the depth (a). The compressive residual stress distribution affects a_hml, and the a_hml of SP(0.6+0.08), which has a large compressive residual stress and a high fatigue limit, appeared large. a_hml of SP_(0.6+0.08) introduced deeper than the residual stress of SP_(0.8+0.08) is larger in the range of As=1.0-0.3. Since the residual stress in the thickness direction has a greater effect on a_hml than the residual stress at the surface, it is necessary to introduce it more deeply. The relation of a_hml, a_25,50, and aNDI were evaluated in the point for safety and reliability.

초음파 나노 결정 표면개질된 SCM435의 특이한 피로 파괴 특성

김재훈 ( Jae-hoon Kim ),윤서현 ( Seo-hyun Yun ),남기우 ( Ki-woo Nam ) 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.2

Using the fatigue limit (△σ_unsm) and residual stress (σ_r) of the UNSM smooth specimen, the harmless maximum crack depth (a_hlm) according to the crack aspect ratio (As) was evaluated. In addition, the relationship between the minimum crack depth (a_NDI1, a_NDI2) detectable by non-destructive inspection(NDI), the crack depth (a₂₅, a₅₀) that reduces the fatigue limit by 25% and 50%, and a_hlm were evaluated. The harmless crack condition was determined by the deepest crack point (point A). Since a_hlm is larger than a₂₅ and a₅₀, a₂₅ and a₅₀ can secure the safety and reliability of steel via UNSM. Because a_NDI1 and a_NDI2 are larger than a₂₅ and a₅₀, cracks in a₂₅ and a₅₀ cannot be detected by non-destructive testing. Therefore it is necessary to apply more precise NDI.

표면균열무해화 기법에 의한 SKD61의 신뢰성 향상

이금화,구경희,김재훈,윤서현,권영국,남기우,Lee, Gum-Hwa,Gu, Kyoung-Hee,Kim, Jae-Hoon,Yun, Seo-Hyun,Kwon, Yung-Kug,Nam, Ki-Woo 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.5

Using the fatigue limit (△σ_unsm) and residual stress (σ_r) of the UNSM smooth specimen, the harmless maximum crack depth (α_hml) according to the crack aspect ratio (As) was evaluated. α_hml evaluated the reliability in the relationship between the minimum crack depth (α_NDI1, α_NDI2) detectable by nondestructive inspection(NDI) and the crack depth (α₂₅, α₅₀) that reduces the fatigue limit by 25% and 50%. All α_hml was determined by the crack depth. The α_hml of 80N UNSM with high σ_r and high △σ_unsm was found to be large. σ_r in the depth direction had a much effect on α_hml. Since α_hml>α₅₀(As=0.6-0.1) and α_hml>α₂₅, α₂₅ and α₅₀(some range) can secure the safety and reliability. Since α_hml<α₅₀ (As=1. 0-0. 6), it cannot be made harmless by UNSM. So safety and reliability cannot be secured. α_NDI1 and α_NDI2 are larger than α₂₅, α₂₅ cannot be detected by NDI. α_NDI1 and α_NDI2 are smaller than α₅₀, α₂₅ can detected by NDI.

마찰교반용접된 A6061/T6 의 균열 무해화 크기 평가

이금화(Gum-Hwa Lee),박상현(Sang-Hyun Park),윤서현(Seo-Hyun Yun),남기우(Ki-Woo Nam) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.6

유/무기하이브리드 용액으로 코팅된 A6061/T6 의 내식 특성

이금화(Gum-Hwa Lee),박미향(Mi-Hyang Park),윤서현(Seo-Hyun Yun),남기우(Ki-Woo Nam) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.6

표면균열 무해화기술에 의한 마레이징 강의 균열 무해화 크기 평가

이금화(Gum-Hwa Lee),최진우(Jin-Woo Choi),윤서현(Seo-Hyun Yun),남기우(Ki-Woo Nam) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.6