외부보강된 밀봉 상태가 다른 Bi-2223테이프의 가압 LN₂하에서 임계전류의 굽힘변형률 의존성

신형섭,박정수,Shin, Hyung-Seop,Dizon, John Ryan C,Park, Jeong-Soo,Rolley, Bonifacio 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.6

The critical current degradation behaviors of multifilamentary Bi-2223 superconducting tapes under pressurized liquid nitrogen were investigated using a r-shaped sample holder which gives a series of bending strains to tape. Three kinds of externally-reinforced Bi-2223 tapes with different hermeticity were used as samples. The tape with the thicker reinforcement layer had a better bending strain tolerance of $I_c$, but when the bending strain was calculated at the outermost filament, the $I_c$ degradation behavior became identical. For all samples, $I_{c0}$ decreased with the increase of applied pressure, but the $I_c$ degradation behavior with bending strain at each pressure level was similar. Furthermore, after depressurization from 1 MPa to atmospheric pressure, $I_c$ was completely recovered to its initial values. When the samples were warmed up to room temperature after pressurization tests, the ballooning damage occurred at lower bending strain regions. The region where ballooning was observed was identical to the one where the significant $I_c$ degradation occurred.

마그네슘합금(AZ31B) 판재의 마찰교반 점용접시 접합특성에 미치는 툴 속도의 영향

신형섭,정윤철,최광,Shin, Hyung-Seop,Jung, Yoon-Chul,Choi, Kwang 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.2

In this study, the friction stir spot welding (FSSW) of Mg alloy sheets has been tried using an apparatus devised with a CNC milling machine to give the precise control of joining condition including tool speed. The probe tool used is made of hard metal and composed of cylindrical shoulder and pin parts. The variation of morphologies formed after the friction stir spot welding depending on the plunge speed of the tool were investigated at each rpm of tool. The history of the temperature distribution and the vertical load induced during the spot welding with friction time were measured by using an Infrared Thermal Imager (THERMA CAMTM SC2000) and a loadcell located below the specimen fixture, respectively. Tensile-shear tests were also performed to evaluate the fracture load of welded specimens. In order to characterize the friction stir spot welding of Mg alloy sheets, the variation of the fracture load was discussed on micrographic observations, temperature distribution during the FSSW according to the plunge speeds of tool.

A Study on the Implications of Christian Education on the Relationship between the Formation of Faith and Digital Literacy

신형섭,Shin, Hyoung-Seop The Korean Society of Christian Religious Educatio 2021 기독교교육논총 Vol.- No.65

The purpose of this study is to find the implications of Christian education on the relationship between the formation of faith and digital literacy in the Korean society, which is rapidly changing within the fourth Industrial Revolution today through critical conversations on educational contexts. Over the past decade, Korean society has lived in an era of rapid and radical change more than any other time through a new way of life called the Fourth Industrial Revolution. The Korean church is also facing the reality that it must fulfill its urgent mission to deliver the unchanging truth in an ever-changing era. With this in mind, this study (1) identifies digital literacy as an essential competency requested in the era of the fourth industrial revolution by examining the relationship with congregation's life as well as its definition and contents, (2) discovers educational rationale for the relationship between faith formation and digital literacy by applying educational context of Christian education with attention to the educational efficiency of digital literacy, and (3) finds educational implications of digital literacy by re-conceptualizing the contents, context, role of teachers and students, and evaluation in the context of Christian education. I hope that this study will help Christian education serve for the spread of the Gospel of Christ and the realization of the kingdom of God on this earth through digital media in the future more time-responsively and mission-practically. 본 연구의 목적은 오늘날 제4차산업혁명을 통해 빠르게 변화하고 있는 한국 사회에 있어서 신앙 형성과 디지털 리터러시 사이의 관계에 대하여 연구하고, 이를 통하여 발견 되어지는 디지털 리터러시의 기독교교육적 함의점을 찾아내기 위한 것이다. 지난 10년 동안 한국 사회는 새로운 삶의 방식인 제4차 산업혁명을 통해 그 어느 때보다도 빠르고 급진적인 변화의 시대를 살아왔다. 한국교회는 그 어느 때보다도 긴급하고 본질적인 사명인 변치 않는 진리를 변하는 세상속에 온전하고 합당하게 전해야 하는 현실앞에 마주하게 되었다. 이러한 점을 염두에 두고, 본 연구는 첫째, 제4차산업혁명에 필수적으로 요청되는 디지털 리터러시의 의미와 역사와 요청 되어지는 역량에 대하여 정리하고, 둘째, 기독교교육의 핵심개념인 신앙형성과 디지털 리터러시의 시대요청적인 관계를 확인하여 신앙형성의 구체적인 교육현장에 적용할 수 있는 가능성을 비판적으로 확인하며, 셋째, 디지털 리터러시를 기독교교육의 현장에 활용할 때 발견되어지는 기독교교육적 함의점들을 교육내용, 교육현장, 교사 및 학생의 역할, 그리고 평가적 재개념화를 통해서 찾고자 한다. 바라기는, 이 연구를 통하여 앞으로 기독교교육이 디지털 미디어를 활용한 보다 시대반영적이며, 사명실천적인 신앙형성의 사건을 지속적으로 세워가기를 기대한다.

탄화규소에 구형입자의 정적압입 및 충격시 부하속도의 영향

신형섭,Shin, Hyung-Seop 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.12

In order to study the relationship between static and cynamic behaviors of silion caride, both quasi-static indentaiton and impact experiments of spherical particle have been conducted. The difference inmaterial behavior when using the two mehtods suggests a loading rate difference in the damate pattrern and fracture strength of silicon carbide. This investigation showed some difference in damage pattern according to particla property, especially inthe case of particle impact. There was no differences in deformation behaviors according to the loading rate when the crater profiles were compared with each other at the same contact radius. From the result of residual strength evaluation, it was found that the strength degradation began at the initiation of ring crack and its behavior was colsely related to morphologies of the damage developed which was also dependent upon the extent of deformation atthe loaidng point. In the case of static indentation, there didnot exist the particle property effects onthe strength degradation behavior.

모래와 실트의 탁수에 대한 분광특성 분석

신형섭,이규호,박종화,Shin, Hyoung-Sub,Lee, Kyu-Ho,Park, Jong-Hwa 한국농공학회 2009 한국농공학회논문집 Vol.51 No.3

The objective of this study was to investigate the basic relationships between spectral reflectance and varying concentrations of sediment in surface waters. An experimental method for determining suspended sediment concentration (SSC) in the water by use of a spectroradiometer above the water surface, in visible and near-infrared (NIR) wavelengths, is applied. The main advantage of the method is the direct comparison of spectral reflectance and the SSC, but it requires an accurate knowledge of the water body and sediment. Therefore numerous spectroradiometric measurements are carried out in situ measurements, for SSC, ranging from zero to 100 percentage and two types of sediment applied in the water tank. The results indicate that the suspended sediment causes increasing spectral reflectance response in waters. We observed that spectral reflectance increases with SSC, first at the lower wavelengths (430-480 nm), then in the middle wavelengths (570-700 nm), and finally, in the NIR domain (800-820 nm); a characteristic maximum reflectance appears at 400-670 nm. Relationships between the wavelength, integral value, and the SSC were evaluated on the basis of the regression analysis. The regression curve for the relation between the wavelength, integral value, and the SSC were determined ($R^2$>0.98). Finally, the specular wavelength can be estimated to recognize the sediment and to improve SC estimation accuracy in the water.

육방정 페라이트의 결정과 Block 구조

신형섭,Shin, Hyung-Sup 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.3

It has been studied the crystal and block structures of the hexagonal ferrites with M, W, Y and Z types prepared by various coprecipitation-oxidation method. The structures have been refined with a Rietveld analysis of the powder X-ray diffraction pattern with high precision ($R_{WP}$ <0.09, $R_I$ <0.03). The density difference between the S-blocks was proportioned to the cobalt contents in hexagonal ferrites, but that between the R or T-blocks was relatively small. Compared with the blocks and cation-oxygen polyhedra in BaM ($BaFe_{12}O_{19}$), those were bulky to the normal direction for the c-axis in $Co_2W$ ($BaCo_2Fe_{16}O_{27}$) and to the parallel direction for the c-axis in $Co_2Y$ ($Ba_2Co_2Fe_{12}O_{22}$) and $Co_2Z$ ($Ba_3Co_2Fe_{24}O_{41}$). The S-blocks of $Co_2W$, $Co_2Y$, and $Co_2Z$ were unstable and distorted. Because the T-block of $Co_2Z$ was unstable, the T-block was decomposed into the Ba-rich phase and $Co_2W$ at high temperatures above $1200^{\circ}C$. A standard powder X-ray diffraction pattern for $Co_2Z$ was proposed as well.

몬테 카를로 시뮬레이션을 이용한 2차원 X-선 검출기에 대한 연구

신형섭,이학재,이기성,강정원,Shin, Hyoung-Sup,Lee, Hak-Jae,Lee, Ki-Sung,Kang, Jung-Won 한국반도체디스플레이기술학회 2010 반도체디스플레이기술학회지 Vol.9 No.4

X-ray absorption rate and multiplication factor of X-ray detector were calculated with Garfield code. High Z (= atomic number) was important factor to increase the absorption rate but low Z is also important to increase the multiplication. Five different gas composition were examined under the condition of 1400 V bias and 400 um gap. Xe 100% gas showed the highest absorption rate and He 96% + isobutene 4% showed the highest multiplication.

패널자료를 이용한 신혼가구의 주택점유형태와 출산 관계 연구

신형섭,Shin, Hyungsub 한국토지주택공사 토지주택연구원 2022 LHI journal of land, housing, and urban affairs Vol.13 No.3

In this study, we investigate the interrelationship between housing tenure and childbirth by exploiting the correlation probability effect method that accounts for household heterogeneity. Using the newlywed household panel from 2011 to 2022, we find that home ownership has a positive impact on childbirth in newlyweds. Specifically, newlywed households with housing tenure show a 6.2%p higher birth rate and a 5.7%p higher second childbirth than newlywed households living in rented houses. For the case of first childbirth, we employ the probability effect probit model since the endogeneity was not detected between housing tenure and birth rate. We document the differential effects of housing tenure on childbirth in that the first childbirth rate is higher for households without housing tenures. The negative effects on first childbirth could be attributed to the economic burden due to initial housing ownership, while housing tenure could eventually provide housing stability, leading to positive effects on more than one childbirth. Finally, we identify that households with childbirth over the last year show a 4.2%p and 3.9%p lower probabilities of housing tenure in the total sample and second childbirth sample, respectively. This suggests that the increased living cost due to childbirth could delay home ownership.

오약순기산(烏藥順氣散)이 고혈압과 동맥혈관에 미치는 영향

신형섭,고흥,김호현,Shin, Hyung-Sup,Ko, Heung,Kim, Ho-Hyun 한국한의학연구원 2004 한국한의학연구원논문집 Vol.10 No.2

Objectives : This experiments were performed to determine the effect of OYakSoonGi-San extract on hypertension in spontaneous hypertensive rat and norepinephrine-induced arterial contraction in rabbit. Methods : In order to define the effect of OYakSoonGi-San extract on contracted rabbit carotid arterial strips, transverse strips with intact or damaged endothelium were used for the experiment using organ bath. To analyze the mechanism of OYakSoonGi-San extract-induced relaxation, OYakSoonGi-San extract infused into contracted arterial strips induced by norepinephrine after treatment of indomethacin, $N{\omega}-nitro-L-arginine$, methylene blue or tetraethylammonium chloride. Results : Blood pressure was significantly decreased five days after administration of OYakSoonGi-San extract. The relaxation effect of OYakSoonGi-San extract was dependent on the presence of endothelium, showing that OYakSoonGi-San extract-induced relaxation was not observed in the strips without endothelium. Also OYakSoonGi-San extract-induced relaxation was significantly inhibited in arterial strips which were contracted by high $K^+$. OYakSoonGi-San extract-indeced relaxation was significantly inhibited by the pre-treatment of $N{\omega}-nitro-L-arginine$ or methylene blue, but it was not observed in the strips pre-treated with indomethacin or tetraethylammonium chloride. When additive application of $Ca^{2+}$ in arterial strips which were pre-contracted by norepinephrine in a $Ca^{2+}$-free solution, arterial contraction was increased. But contractile response to $Ca^{2+}$ was attenuated by pre-treatment of OYakSoonGi-San extract. Conclusions : These results demonstrated that OYakSoonGi-San could be applied effectively to hypertension and may inhibit agonist-induced contraction through an decrease influx of extra-cellular $Ca^{2+}$ by the formation of nitric oxide in the vascular endothelial cells.

스피넬 페라이트의 비이완 표면에너지 계산

신형섭,손정호,Shin, Hyung-Sup,Sohn, Jeongho 한국재료학회 2015 한국재료학회지 Vol.25 No.12

A new method is proposed for the calculation of the unrelaxed surface energy of spinel ferrite. The surface energy calculation consists of (1) setting the central and computational domains in the semi-infinite real lattice, having a specific surface, and having an infinite real lattice; (2) calculation of the lattice energies produced by the associated portion of each ion in the relative domain; and (3) dividing the difference between the semi-infinite lattice energy and the infinite lattice energy on the exposed surface area in the central domain. The surface energy was found to converge with a slight expansion of the domain in the real lattice. This method is superior to any other so far reported due to its simple concept and reduced computing burden. The unrelaxed surface energies of the (100), (110), and (111) of $ZnFe_2O_4$ and $Fe_3O_4$ were evaluated by using in the semi-infinite real lattices containing only one surface. For the normal spinel $ZnFe_2O_4$, the(100), which consisted of tetrahedral coordinated $Zn^{2+}$ was electrostatically the most stable surface. But, for the inverses pinel $Fe_3O_4$, the(111), which consisted of tetrahedral coordinated $Fe^{3+}$ and octahedral coordinated $Fe^{2+}$ was electrostatically the most stable surface.