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Dong‑Su Bae,Un‑Bong Baek,Seung‑Hoon Nahm,Ilguk Jo 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.2
This study investigated the effect of the hydrogen charging time on the hydrogen embrittlement of hot-rolled and acceleratedcoolingtreated API X70 steel by using the electrochemical hydrogen charging method. Tensile and V-notch Charpy impacttest were completed for the specimens of hydrogen charged for 0, 2, 4, and 10 h, and then microstructural observation wereperformed. The tensile and yield strength tended to decrease slightly and the total elongation started to decrease rapidly up to2 h charging time and then these gradually decreased with the hydrogen charging time. The post-uniform elongation increasedslightly after the holding time of 2 h due to the occurrence of two-step stress reduction phenomenon and its mechanismhas suggested. The effect of the hydrogen embrittlement on impact absorption energy according to the hydrogen chargingtime were also investigated. The fracture surface of the hydrogen charged ones are generally composed of cleavage fracturesurfaces. It was demonstrated that the external cracks were formed on the outside of tensile tested specimen and the externalshape of the fracture portion was fractured without large elongation at hydrogen charged specimens.
장재철,김동윤,박영순,전철,김동조 群山大學校 自然科學硏究所 1991 自然科學硏究 Vol.6 No.-
홍삼 추출물이 반치사량정도의 방사선(5Gy)에 조사된 생쥐조직 및 이들 조직에서의 효소활성에 미치는 영향을 관찰하기 위하여 ICR계 생쥐를 대상으로, 생리적 식염수군을 대조구군으로 하여, 홍삼 추출물 투여군과 방사선만을 조사한군 및 홍삼 추출물 투여후 방사선 조사군 등 4군으로 나누어 1일, 4일, 9일, 17일 및 30일 등 5회에 걸쳐 생체의 조직중 비장 및 고환에서의 중량 변화 및 GOT와 GPT의 활성을 측정하여 결과를 얻었다. 비장의 중량변화는 1일째 및 4일째 최소치를 보이다가 이후 증가추세를 보였으며, 고환의 중량 변화는 17일 이후 급격한 감소로 30일에도 증가하지 못했다. GOT의 활성도 변화는 비장에서는 초기에 현저히 증가했으며 이후 회복하는 경향이었다. 방사선 조사군들에서는 홍삼추출물 투여군이 방사선만을 조사한 군보다 빠르게 회복하는 경향이었으며 고환에서의 GOT활성은 매우 불안정하였다. GPT 활성도 변화는 비장, 고환에서 모두 초기에 증가하다가 점차 회복하는 경향이었으며 홍삼 추출물 투여후 방사선 조사군이 방사선만을 조사한군보다 빠르게 회복하는 경향이었다. 이러한 결과로 볼 때 홍삼 추출물은 방사선 조사에 의하여 기인된 비장 및 고환의 GOT와 GPT활성도 증가에 방호효과가 있다고 생각된다. This study was prepared to observe the change of tissues weight, glutamate oxaloacetate transminase(GOT) and glutamate pyruvate transminase(GPT) activities in the spleen and testis treated with red ginseng extract injection in the gamma ray irradiated mice. Groups were divided into control, red ginseng extract injection, irradiation after saline injection and irradiation after red ginseng extract injection. The spleen and testis weights were decreased at 17th day irradiation after saline injection and irradiation after red ginseng extract injection. The GOT activity showed earlier recovery at irradiation after red ginseng extract injection group than irradiation after saline injection group in the spleen. The GPT activity showed earlier recovery at irradiation after red ginseng extract injection group than irradiation after saline injection group in the spleen and testis. The above result suggest that red ginseng extract have the recovery effect on the change GOT and GPT activity after radiation injury in the spleen and testis of mice.
남자 초·중학생의 무산소성 작업능력과 무산소성 파워의 관계
정동식,정덕조,정성태,이병근,전태원,김은혜,이동규,정동춘 師範大學 體育硏究所 1998 서울大學校 體育硏究所論集 Vol.19 No.2
The critical power(CP) is the highest intensity to sustain for a long time without a fatigue. The anaerobic work capacity(AWC) is the highest anaerobic capacity to be provided by anaerobic energy system without the infection of hypoxia. The purpose of this study was to determine the relationship between AWC and AnP and to verify the validity of AWC. The subjects were consisted of 10 elementary and 10 middle school male students(12.8±1.3yrs, 159.3±12.1㎝, 49.4±11.8㎏). The critical power and anaerobic work capacity were calculated by work-time relationship after four cycle ergometry test to fatigue from 1 to 10 minute. The anaerobic power included Margaria-Kalmen test, Sargent jump and Wingate test. The main finding were as follows. The AWC of elementary and middle school students. were 6.47±2.63KJ and 11.10±3.01KJ. The AWC of elementary students was 58.3% of the middle school students's one. The AnP of elementary students were 47.2∼66.5% of the middle school students's one. And there were high correlation between AWC and AnP(0.64∼0.87, P<0.01). This study showed that AWC is useful index on AnP both elementary and middle school students.
신진우,조우승,조성빈,김재훈,정지은,사예지,백경동,박동규 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.2
As modern people's interest in health grows, wearable healthcare-related technologies that can collect biometric information and receive health-related services regardless of time and place are developing. This paper proposes the healthcare system based on voice recognition function. Unlike conventional wearable healthcare systems, the proposed system provides real-time telemedicine and diagnosis and the direct connection with doctors is possible through it. And almost all functions of the application in it are operated with voice commands to lower user access barriers. Because it deals with personal information including medical information, encryption algorithms have been applied between all data movements. Finally, the healthcare system proposed in this paper is expected to increase convenience in health care and reduce the medical gap.
허정숙,남보현,황인조,김동술 경희대학교 환경연구소 1999 環境硏究 論文集 Vol.9 No.-
We provide various fundamental statistics for PM-10 based on air quality monitoring data('96-'98) operated by the Ministry of Environment. The purposes of this paper are to examine the distribution of PM-10 level computed on the basis of a reference method adapted by USEPA and to review national ambient air quality standards for particulate matter in Korea. When we calcualted the 3-year('96-'98) average of the annual mean PM-10 concentrations at 24 monitoring sites. 21 sites were not met 50㎍/m(annual PM-10 standard in USA). Especially. Duckchon-dong and Shinpyung-dong sites at Pusan were recorded the highest concentration. Also, when we considered the 3-year average of the 99^(th) percentile values, 14 sites including Ssangmun-dong at Seoul and Duckchon-dong at Pusan among 23 were classified non-attainment area exceeding 150㎍/m(24-hour PM-10 standard in USA). We suggest that the air quality standards for PM-10 and PM2.5 in Korea must be actually regulated based on scientific review and the public health.
변량 계수 모형의 통계적 성질과 실제 적용 모형에 관한 연구
조진남,김동건 同德女子大學校 情報科學硏究所 2005 정보과학연구 Vol.9 No.-
생물을 대상으로 의학, 약학 등의 실험에서 개체별 처리 시점이 일정하지 않을 경우, 시간과 반응값의 관계를 규명하고자 할 때 변량계수모형을 적용한다. 이러한 관계는 선형 또는 2차, 3차 함수의 다항식의 형태로 표현된다. 변량계수 모형은 혼합모형에 속하므로 변량계수모형의 추정과 검정은 혼합모형의 추정 및 검정절차에 따른다. 그리고 실제 실험에서 흔히 적용되는 변량계수모형들의 모형식과 통계적 성질을 규명한다. A random coefficient model is applied when Times of the repeated measures of data are not fixed in experiments of medicine, pharmaceutics with respect to subjects. The model is devised to describe arithmetically the relationship of a measurement with time, especially in linear, quadratic, or cubic relationship. The random coefficient model is considered to be one of mixed models. Hence, the procedures of the inference of a random coefficient model are same as those of a mixed model. Finally, we investigate the equations of various models and statistical properties followed by the models in random coefficient models.
조충현,김홍식,박은석,강성찬,이동헌 圓光大學校 附設 體力科學硏究所 2003 體力科學硏究 Vol.26 No.1
This study was conducted to investigate the effects of the marketing strategy based on the traditional wrestling, which affects the tour industry. The study used the simple random sampling method in the group of the Kwang-Ju district citizens. The group representatives were directly interviewed, and 277 interviewees replied with concern. The rest of the interviewees were not interested in the survey. The general characteristics of the interviewees -- gender, age, education, job, monthly salary. -- were used to analyze the items related to Sports Tourism in general. Sport Tourism in general Male interviewees had higher recognition over females in the interview. The rate of experience was low for both genders. According to their education, the satisfaction of sport tourism showed low rate. However, there were many answers where the interviewees, not depending on the age or gender, indicated that they will participate in the future. The policy recommended based upon the results of the study is as follows. There is a need for setting up a new strategy in order to increase participation of sports. Also, it is urgent to set up a sports theme center to raise professional sportsmen and to supply them to where they are needed.
조동렬 조선대학교 외국문화연구소 1991 外國文化硏究 Vol.14 No.1
Murdoch은 The Bell에서 무엇보다도 인간에 대한 이해와 사랑을 강조한다. James는 처음부터 각성의 가능성이 없는 인물이다. 그는 인간의 개별성과 독립성을 거부하고 신의 법률을 추종하는 것이 가장 올바른 것이라고 판단한 인물이다. 사랑이 다른 존재에 대한 인식이며 이해라는 Murdoch의 관점에서 보았을 때 그는 개선의 가능성이 보이지 않는 이성주의자이다. 그러나 Michael은 James보다 좀 더 Murdoch이 말하는 사랑에 가까이 있는 인물이라 할 수 있다. 그는 인간의 개별성을 인정함으로써, 비록 그것이 자기중심적이라 할지라도 그는 각성이 준비되어 있는 인물이다. Nick이 죽은 이후 그는 다른 존재에 대한 인정과 더불어 그들에 대한 책임을 느끼는 보다 각성된 인물로 발전된다. Dora도 비록 타인의 존재를 인정하고 애정을 지닌 인물이지만 자기인식이 부족한 그래서 무책임한 인물이었으나 결국 외부적 존재에 대한 명확한 인식으로 그녀의 삶을 자신의 삶으로 바꾼 각성의 인물로 변모한다. 이처럼 Murdoch은 인간에 대한 사랑의 차원에서 각성의 문제를 즐겨다룬다. 이같은 인간애의 주제는, Richardson으로부터 George Eliot, Trollope, 그리고 Graham Greene 등의 작가들에서 끊임없이 발견되는 영국 소설의 전통적 주제라 할 수 있다. 이런 면에서 Iris Murdoch은 영국 소설의 전통을 이어온 소설가라 할 수 있을 것이다.
조동렬 조선대학교 외국문화연구소 1994 外國文化硏究 Vol.17 No.1
Yeats는 낭만주의자 또는 상징주의자 또는 모더니스트등으로 불리울 정도로 다양한 면모를 지닌 시인이다. 사실 그의 시에는, 상징을 통해 절대적 영원성을 드러내는 상징주의적 경향, 상상력을 통하여 영원성을 추구하는 낭만주의적 경향 그리고 개인적 감정을 억제하고 현실을 인정하는 모더니즘적 경향이 혼재되어 있음을 볼 수 있다.