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( Ji-yeon Oh ),( Jong-hwa Jang ) 융합연구학회 2018 융합연구학회지 Vol.2 No.1
The purpose of this study is to investigate the academic stress, self efficacy, burn out, social support and college life adaptation of dental hygiene students and their correlations with related factors influencing college life adaptation. A total of 265 students were selected as stratified sampling methods at the universities in which the department of dental hygiene was established nationwide. From September 1, 2015 to October 22, 2015, the self report questionnaire was used. The main variables were college life adaptation, academic stress, self efficacy, burn out, social support, and analyzed using SPSS 21.0. College life adaptation was 5.17 out of 9 points, academic stress was 2.88 points out of 6 points, self efficacy, burn out, and social support were 3.35, 2.60, and 3.54 out of 5, each respectively. Self efficacy and stress due to task and class were significant influences on individual-emotional adaptation in college life adaptation. In the case of college environment adaptation, exhaustion, self efficacy and social support were significant influencing factors. In the case of social adaptation, self efficacy and social support were significant influencing factors. Overall, academic stress and college life adaptation were closely related, and social psychological factors such as burn out, self efficacy and social support were mediated. Therefore, it is suggested that it should be applied to college education in order to increase adaptation of dental hygiene students, to reduce academic stress and burn out, and to develop intervention strategies that can enhance self efficacy and social support.
형태별 구리 및 아연 급여가 비육돈의 생산성, 영양소 소화율, 도체 및 육질 특성에 미치는 영향
김영화,유종상,박준철,정현정,조진호,진영걸,김해진,김인철,이상진,김인호,Kim, Y.H.,Yoo, J.S.,Park, J.C.,Jung, H.J.,Cho, J.H.,Chen, Y.J.,Kim, H.J.,Kim, I.C.,Lee, S.J.,Kim, I.H. 한국축산식품학회 2008 한국축산식품학회지 Vol.28 No.1
This study investigated the effects of copper and zinc sources on growth performance, nutrient digestibility, carcass traits and meat characteristics in finishing pigs. Dietary treatments included 1) inorganic copper ($CuSO_4{\cdot}5H_2O$ 30ppm), 2) organic copper (Cu-methionine, 30 ppm), 3) inorganic zinc (ZnO, 80 ppm) and 4) organic zinc (Zn-methionine, 80 ppm). ZnO treatment improved the ADFI (average daily feed intake) compared to Cu-met and Zn-met treatments (p<0.05) during 5 weeks of treatment. However, during the entire experimental period, the ADG (average daily gain), ADFI and F:G ratio (feed conversion ratio) were not significantly different among the treatments (p>0.05). DM and N digestibility were not significantly different among the treatments after 5 weeks (p>0.05). At the end of the experiment, DM and N digestibility were decreased with Zn-met treatment relative to the other three treatments. The pH value of meat from $CuSO_4$ treated pigs was greater than Zn-met and ZnO treated pigs (p<0.05). Sensory evaluation was carried out for randomly selected (n = 16) paired loin samples. Meat color levels were increased (p<0.05) with Cu treatments compared to Zn treatments. $CuSO_4$ decreased the marbling of meat relative to the other treatments (p<0.05). The firmness was greater with ZnO treatment compared to Cu-met and ZnO treatments (p<0.05). These results indicate that inorganic Zn can improve growth performance, however, inorganic Cu and Zn are as effective as organic Cu and Zn at improving nutrient digestibility, carcass traits and meat quality. This form of organic additive can be friendlier to the environment than inorganic supplements.
김영화,김미정,김명준,Kim, Yeong-Hwa,Kim, Mi-Jung,Kim, Myung-Joon 한국통계학회 2011 응용통계연구 Vol.24 No.2
Credibility theory is one of the most important theories of actuarial science to calculate the proper insurance premium. In this paper, the rule of relative exposure volume, the square root rule, the B$\"{u}$hlmann credibility and B$\"{u}$hlmann-Straub credibility with the basic concept of credibility have been introduced, Also, we estimate new premiums based on these methods for real data. As a result, the rule of relative exposure volume provides the highest accuracy. 합리적인 보험료를 책정하기 위해 사용되는 신뢰도 이론은 보험통계학의 중요한 주요 이론 가운데 하나이다. 본 논문에서는 신뢰도 이론의 기본 개념과 함께 유효대수 법칙, 제곱근 법 칙, B$\"{u}$hlmann 신뢰도, B$\"{u}$hlmann 신뢰도, B$\"{u}$hlmann-Straub 신뢰도 등을 소개하였다. 또한 이러한 방법들에 근거하여 새로운 보험료를 실제 자료를 시용하여 예측하였다. 결론적으로, 유효대수 법칙이 가장 정확한 예측력을 보였다.
발달 독성학에서 비대칭 로짓 모형을 사용한 이진수 자료와 연속형 자료에 대한 결합분석
김영화,황범석,Kim, Yeong-hwa,Hwang, Beom Seuk 한국통계학회 2020 응용통계연구 Vol.33 No.2
하나의 개체에서 여러가지 측정치가 동시에 관찰되는 경우는 다양한 연구 분야에서 흔히 나타난다. 발달 독성학 연구에서는 특정 독성 물질의 각기 다른 수준에 노출된 임신한 어미 쥐에 대해 기형인 태아의 존재와 태아의 무게가 동시에 측정된다. 이런 두 변수를 결합하여 모형화하는 것은 각기 독립적인 두 모형으로 분석하는 것보다 더 효율적인 결과를 낸다고 알려져 있다. 대부분의 결합 모형은 정규분포를 랜덤효과로 가정하여 분석한다. 그러나 발달 독성학 연구에서처럼 반응변수들의 분포가 독성 물질이 변함에 따라 불규칙하게 변하는 경우 정규분포의 가정으로는 그 특징을 잡아낼 수 없게 된다. 본 논문에서는 이진수 자료와 연속형 자료에 대해 비대칭 로짓 모형을 사용한 베이지안 결합모형을 제시한다. 본 모형은 비대칭 로짓 모형을 사용함으로써 반응변수의 분포의 형태가 독성 물질의 수준에 따라 대칭/비대칭의 형태를 자유롭게 띨 수 있는 장점을 가지고 있다. 모형의 적합성을 살펴보기 위해 발달 독성학 연구에서 독성 물질 DEHP에 적용하여 그 결과를 확인해본다. It is common to encounter correlated multiple outcomes measured on the same subject in various research fields. In developmental toxicity studies, presence of malformed pups and fetal weight are measured on the pregnant dams exposed to different levels of a toxic substance. Joint analysis of such two outcomes can result in more efficient inferences than separate models for each outcome. Most methods for joint modeling assume a normal distribution as random effects. However, in developmental toxicity studies, the response distributions may change irregularly in location and shape as the level of toxic substance changes, which may not be captured by a normal random effects model. Motivated by applications in developmental toxicity studies, we propose a Bayesian joint model for binary and continuous outcomes. In our model, we incorporate a skewed logit model for the binary outcome to allow the response distributions to have flexibly in both symmetric and asymmetric shapes on the toxic levels. We apply our proposed method to data from a developmental toxicity study of diethylhexyl phthalate.
김영화,Kim Young-hwa 한국관개배수위원회 1998 한국관개배수논문집 Vol.5 No.2
In this research the valve-opening calculation program for operation of valve was developed to determine the valve-openings corresponding to discharges in pipeline system. Personal Computers can be used for hydraulic calculations of the steady flow condit
압축피로에 의한 포천화강암의 미세균열 발달과 P파속도 이방성
김영화,장보안,문병관,Kim, Yeonghwa,Jang, Bo-An,Moon, Byeung Kwan 대한자원환경지질학회 1997 자원환경지질 Vol.30 No.4
P wave velocities of core samples from the Pocheon granite were measured before and after applications of cyclic loading. Then. distribution of the pre-existing microcracks and microcracks developed due to the cyclic loading was investigated by analyzing P wave velocity anisotropies and microscopic observations from thin sections. Anisotropy constants were calculated with three different ways: (1) $C_A$ between the maximum and the minimum velocities, (2) $C_AI$ between velocities measured along the axial direction and the average of six velocities measured in the planes perpendicular to the loading axis (rift plane) and (3) $C_AII$ between the maximum and the minimum velocities measured in the plane perpendicular to the loading axis. Among anisotropy constants. $C_AI$ was the most effective anisotropy constant to identify the rift plane whose orientation is parallel to the pre-existing microcracks as well as the distribution of stress induced microcracks. $C_AI$ decreased after cyclic loading and the relationship between $C_AI$ and number of cycles shows comparatively coherent negative trends. indicating that stress induced microcracks are aligned perpendicular to the orientation of pre-existing microcracks and that the amounts are proportional to the number of loading cycles. The difference of anisotropy constants before and after cyclic loading was effective in delineating the level of cracks and we called it Induced Crack Index. Velocity measurements and microscopic observations show that anisotropy was caused mainly due to microcracks aligned to a particular direction.
김영화,Kim, Yeong-Hwa 한국관개배수위원회 2006 한국관개배수논문집 Vol.13 No.1
이 논문은 미국 New Santa Fe에 있는 독립 Consultant 인 David Groenfeldt.에 의해 작성되었다.