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신현호,김철수,김창욱,장순남,성완,장동환,강석원,최석홍,Shin, Hyun-Ho,Kim, Chool-Soo,Kim, Chang-Wook,Chang, Soon-Nam,Sung, Wan,Chang, Dong-Hwan,Kang, Suk-Won,Choi, Suk-Hong 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.1
Mullitization in a multicomponent oxide system(alumina-kaolin-quartz-feldspar-talc) was studied as a function of sintering temperature from 1200 to 1500$^{\circ}C$ based upon a quantitative X-ray diffraction analysis. In the present study mullite grew as wiskers and its formation reaction showed characteristic there stages as follows In the first stage(1255-1295$^{\circ}C$) an appreciable mullitization(nucleation) occurred while corun-dum dissolution into glass (increasing glass content ) limited the rate of the reaction. At 1295-1335$^{\circ}C$ (second state) the reaction was significantly enhanced with a considerable glass consumption and with no appreciable change in corundum content. Finally (above 1335$^{\circ}C$) the reaction rate was attenuated re-markably with an apparent decrease in glass consumption rate. The impingement of mullite whiskers by oth-er whiskers and crystals was speculated to cause mullite growth in thickness direction with a slow growth rate resulting in the diminished reaction rate in the final stage.
파이프 이음부가 단동온실 구조성능에 미치는 영향: 실대형 실험적 및 해석적 연구
신현호,류희룡,유인호,조명환,서태철,김승유,최만권,Shin, Hyun Ho,Ryu, Hee Ryong,Yu, In Ho,Cho, Myeong Whan,Seo, Tae Cheol,Kim, Seung Yu,Choi, Man Kwon 한국생물환경조절학회 2021 생물환경조절학회지 Vol.30 No.4
This study was conducted in 8.2m wide single-span greenhouse to investigate the effect of presence or absence of rafter steel pipe joint and foundation conditions on greenhouse structural performance. Structural performance was evaluated by static loading test using the structural performance evaluation system for single-span greenhouse. The measured displacement was compared with the predicted result by numerical analysis. The displacement of each measurement location showed a significant difference regardless of the conditions of the foundation and presence or absence of rafter steel pipe joint. Compared to the hinge conditions, the difference in structural performance of the greenhouse in the fixed conditions was seen to be relatively large. The difference in structural performance according to presence or absence of rafter steel pipe joints, the lateral stiffness of the joint was 8.1% greater. 본 연구에서는 원예특작시설 내재해형 규격서에 등록되어 있는 폭이 넓은 단동온실(10-단동-5형)을 대상으로 기초의 경계조건과 서까래 강관의 이음 유무에 대해 실물 크기 실험을 실시하고 그 결과를 수치해석 결과와 비교하여 이음부가 있을 때 구조성능 차이에 대해 알아보았다. 각 측정 위치별 변위를 실험에서 측정한 값과 수치해석으로 예측한 값을 비교한 결과에서는 기초의 조건 및 서까래 강관 이음 유무에 상관없이 모두 상당한 차이를 보였고, 힌지 조건 보다 고정 조건이 상대적으로 차이가 컸다. 그리고 모든 절점을 강접합으로 가정하고 구조해석한 결과를 구조실험과 비교한 결과에서는 힌지조건이 고정조건 보다 잘 일치하였지만 해석값이 실험값 보다 크게 나타났다. 수치해석은 모든 절점을 강접합으로 가정했기 때문에 실제 성능과 달랐다. 따라서 현재 모든 절점을 강접합으로 가정하고 온실을 설계를 하면 과소설계될 우려가 있어 앞으로 신뢰성 높은 온실 설계를 위해서는 서까래와 도리가 교차하는 교차부 성능 특성을 고려한 구조해석 기술 개발이 이루어져야 할 것으로 판단된다.
신현호 ( Hyun-ho¸ Shin ) 현대영미어문학회 1993 현대영미어문학 Vol.11 No.-
Dylan Thomas was in a rather peculiar position among the contemporary poets. Pound, Eliot, Yeats and Auden all represent an intellectualization of the poetic world or an implied view of poetry as social achievement. On the other hand, Thomas takes an attitude of antithetical movement such as William Blake. Thomas’ whole interest was in the self-exploration. He, casting light on the dark interior of the self, tried to discover himself. His poetry explores the subject of birth and death, creation and destruction in terms of primitivism, pantheism and finally love of man, accepting and celebrating the tragic human condition. In his early poetry based upon the “womb and tomb” motif, he attempted to overcome the fear of death by firmly believing the coexistence of birth and death. What Thomas found to symbolize this belief was the womb where birth and death seems to coexist. And he considered death as a part of nature’s process. His poetry of the middle period shows a greater involvement with others, as “A Refusal to Mourn the Death” and “After the funeral”, he does not deny the death of all things, including himself, but in anticipating this necessary destruction within poems and by participating in it, Thomas can overcome the fear of death. And the final period, characterized by longer, narrative poems like “Fern Hill” or “Poem in October” is one of acceptance of humanity and the tragic condition of man, or a movement toward affirmation and a conditional consent to the presence of death in life. Though Thomas dealt with the familiar theme to us, he dealt with it in a strange, surprising way. His originality and worthiness lies in the technique rather than themes. In talking of the change of technique, Thomas’s idiosyncratic language in his early poem is the reflection both of joy in playing with words and of a necessity to express the ineffable unity of the universe. While Thomas’ middle period shows a greater concern with the specifics of eternal reality displaced the primary vision, so that in the later poems ultimate realities are approached through nature and daily life instead of visionary imagery.
신현호,윤상옥,김신,황인준,Shin, Hyunho,Yoon, Sang-Ok,Kim, Shin,Hwang, Injoon 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.3
The effect of a $WO_3$ or $Ga_2O_3$ addition on the densification, phase evolution, optical reflectance, and elastic and dielectric properties of $Y_2O_3$-doped AlN ceramics sintered at $1800^{\circ}C$ for 3 h is investigated. The investigated compositions of the additives are 4.5 wt% $Y_2O_3$ (YA), 3.5 wt% $Y_2O_3$-1.0 wt% $Ga_2O_3$ (YGA), and 3.5 wt% $Y_2O_3$-1.0 wt% $WO_3$ (YWA). $YAlO_3$ and $Y_4Al_2O_9$ form as the secondary phases in all of the investigated compositions, whereas $W_2B$ appears additionally in the YWA. In the YGA, Ga is detected in the AlN grains, indicating that the dissolution of $Ga_2O_3$ into the AlN lattice occurs. The addition of $WO_3$ blackens the specimen more significantly than that of $Ga_2O_3$ does. In all of the investigated specimens, the linear shrinkage and the apparent density are above 20 percent and in the range of 3.34-3.37 $g/cm^3$, respectively. The elastic modulus, Poisson's ratio, the dielectric constant, and the dielectric loss are in the ranges of 335-368 GPa, 0.146-0.237, 8.60-8.63, $2.65-3.95{\times}10^{-3}$, respectively. The sinterability and the properties of $Y_2O_3$-doped AlN ceramics are not much altered by the addition of $WO_3$ or $Ga_2O_3$.
신현호(Hyun-ho Shin),최우준(Woo Jun Choi),김준철(Jun Chul Kim),나삼식(Sam sick Na),안훈모(Hun Mo Ahn) 대한의료기공학회 2009 醫療氣功 Vol.11 No.1
Objective : The studies on liver effect in administration of western medicine have been well-established so far, but the studies on liver effect in administration or herbal medicine haven't been made. To make things worse, people who have liver disease generally believe that taking a herbal medicine is not useful to take care or their disease and even think it can cause liver disease. But this belief is not verified at all. So we feel the need to study about how taking herbal medicine affect to liver injury patient. Methods : We chose the 4 patient who seems to have the liver injury on the index of liver function test and we administrate the herbal medicine and after several day or weeks we recheck the liver function test. Results : Through the this method, we find the positive effect of taking herbal medicine on the patients who have the liver disease. Conclusions : Our results give no evidence that herbal medicine is harmful for liver disease. We need to study more about this.
냉매 R-245fa를 적용한 이상냉각시스템에 대한 실험적 연구
신현호(Hyun Ho Shin),이동찬(Dong Chan Lee),정현준(Hyun Joon Chung),강훈(Hoon Kang),김용찬(Yongchan Kim),이광진(Kwang-jin Lee),강성욱(Sung-wook Kang),최혜윤(Hye-yoon Choi),양환석(Hwan-seok Yang) 대한설비공학회 2020 설비공학 논문집 Vol.32 No.2
Increasing heat dissipation of many applications requires more efficient active cooling technology. Conventional liquid-cooling systems show low temperature uniformity and excessive pressure drops at a high flow rate. Two-phase cooling systems have been widely studied as an alternative because of their high thermal and hydraulic performance. In this study, the thermal and hydraulic characteristics of the two-phase cooling system are investigated experimentally using R-245fa as a working fluid. The heat transfer and pressure drop characteristics of flow boiling in the cold plate were measured by varying the charge amount of the working fluid, pump rotating speed, and heater power of a cold plate. Compared with the conventional water-cooling system of similar thermal resistance, the two-phase cooling system demonstrated 27.3% more uniform temperature distribution with 85.7% less pumping power.