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현상훈(Hyun, Sang-Hoon),윤동열(Yoon, Dong-Yeol) 대한경영학회 2016 대한경영학회 학술발표대회 발표논문집 Vol.2016 No.2
The purpose of this study is to identify the impact relation of perceived ease of use of WorkTV broadcasting media and perceived usefulness of WorkTV programs on WorkTV use(view) intention and to examine the mediating effect of WorkTV viewers’ satisfaction(JPEI/JBEI) through empirical study. According to the factor analysis, both perceived ease of use and WorkTV use(view) intention of WorkTV broadcasting media were not divided into two factors-television(cable tv, internet protocol tv, satellite) and replay service of internet homepage. In addition, Job Broadcasting Evaluation Index(JBEI) and Job Program Evaluation Index(JPEI) were not distinguished. Therefore, this study analyzed these two factors as one factor-WorkTV viewers’ satisfaction. For this purpose, total of 3,190 WorkTV viewers participated in a web survey. Excluding defective data of 54 viewers, 3,136 viewers’ survey responses were used for the final analysis. The study results are as follows. First, perceived ease of use of WorkTV broadcasting media has a positive relationship with WorkTV use(view) intention. Second, perceived usefulness of WorkTV programs has a positive relationship with WorkTV use(view) intention. Third, perceived ease of use of WorkTV broadcasting media and perceived usefulness of WorkTV programs have a positive relationship with WorkTV viewers’ satisfaction(JPEI/JBEI). Finally, the partial mediating effect of WorkTV viewers’ satisfaction(JPEI/JBEI) was identified on the impact relation of perceived ease of use of WorkTV broadcasting media and perceived usefulness of WorkTV programs on WorkTV use(view) intention. Based on these results, viewers’ satisfactionand WorkTV use(view) intention can beincreased by making efforts to improve ease of use of WorkTV broadcasting media(broadcasting channel diversification, homepage reorganization, etc.) and managing WorkTV program quality.
현상훈 ( Sang Hoon Hyun ),강영모 ( Young Mo Kang ) 대한류마티스학회 2000 대한류마티스학회지 Vol.7 No.2
Objective: To define the prevalence of thyroid dysfunction and autoantibodies in rheumatoid arthritis(RA). Methods: A prospective controlled study was conducted on 62 RA patients and 55 controls with non-inflammatory rheumatic diseases (3 osteoarthritis, 6 fibromyalgia, 4 carpal tunnel syndrome and 42 patients with nonspecific joint pain). All subjects were tested for T3, T4, TSH, FT4, RAIU, rheumatoid factor and ANA. Anti-thyroglobulin (TG) Ab and anti-microsomal (Mic) Ab were assayed using a more sensitive direct assay of RIA and TSH-R Ab (TRAb) using competitive radioimmunoassay. Results: Thyroid dysfunction was observed in 10 RA patients (16.2%) of which 6 patients had hypothyroidism and 4 patients hyperthyroidism, and was significantly more prevalent in RA (p=0.026). Anti-Mic Ab was significantly more prevalent in RA patients. The frequencies of anti-Mic Ab and anti-TG Ab in RA patients were 69.4% and 58.1% (cut-off value was 0.3U/ml), but were 16.1% and 12.9% when those over l0U/ml were calculated. Thyroid dysfunction was not present when either of anti-TG Ab or anti-Mic Ab was below 0.3U/ml. The prevalence of thyroid dysfunction or autoantibodies were not different according to the presence of RF or ANA. Conclusion: The prevalence of thyroid dysfunction and autoantibodies were significantly increased in RA patients and the variance of the latter in other reports might be explained at least partially by difference in cut-off values of different methods. Thyroid dysfunction may not develop when either of anti-Mic Ab or anti-TG Ab is below 0.3 U/㎖ in RA.
수계 테이프 케스팅 법에 의한 봉상 γ-LiAlO<sub>2</sub> 입자 강화 MCFC 매트릭스 제조 공정의 최적화
최현종,신미영,현상훈,임희천,Choi, Hyun-Jong,Shin, Mi-Young,Hyun, Sang-Hoon,Lim, Hee-Chun 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.3
Rod-shaped particle reinforced $LiAlO_2$ matrices for MCFC were fabricated by an aqueous tape-casting technique. The hydrolysis reaction and agglomeration of $\gamma-LiAlO_2$ particles in aqueous slurries were inhibited by additions of $LiOH{\cdot}H_2O$ and glycerin to the aqueous $\gamma-LiAlO_2$ slurry. The tape-casting, performed using the aqueous slurry containing protein albumin, was fast and led to an effective drying at casting temperature range of $60{\sim}65^{\circ}C$. The strength of the particle reinforced matrix was improved about 4 times compared to that of matrix without reinforcement. Pore size distribution ($0.1{\sim}0.4{\mu}m$) and porosity ($50{\sim}60%$) of the reinforced matrices were determined to be appropriate for the MCFC matrix. The aqueous tape casting process is not only environmental-friendly but also efficient for fabricating MCFC matrices compared to non-aqueous tape casting.
연규석,김영익,현상훈,김용성,Yeon, Kyu-Seok,Kim, Young-Ik,Hyun, Sang-Hoon,Kim, Yong-Seong 한국농공학회 2010 한국농공학회논문집 Vol.52 No.1
The cemented sand and gravel (CSG) method is a construction technique that adds cement and water to rock-like materials, such as rivered gravel or excavation muck which that can be obtained easily at areas adjacent to dam sites. This study was performed to evaluate the unconfined compressive strength properties and freezing and thawing resistance of CSG materials with unit cement content. The three types of CSG-80, CSG-100 and CSG-120 with cement content were designed to evaluate the optimum water content, dry density, strength, stress-strain, micro structure and durability factor. As the results, the optimum water content ratio with cement content showed almost similar tendency, and the unconfined compressive strength and dry density increased as cement content increases. The strength ratio of 7 days for 28 days were in the range of 55~61 % and the strain ratio in stress-strain curve were in the range of 0.8~1.6 % nearby maximum strength in 28 days. It is expected that this study will contribute to increasing application of CSG method as well as to increasing the utilizing of CSG materials as a environmentally friendly CSG method.
조철희,여정구,안영수,한문희,김용하,현상훈,Cho, Churl-Hee,Yeo, Jeong-Gu,Ahn, Young-Soo,Han, Moon-Hee,Kim, Yong-Ha,Hyun, Sang-Hoon The Membrane Society of Korea 2007 멤브레인 Vol.17 No.3
다양한 재료특성(Si/Al 몰비, 두께, 구조적 불완전성)을 갖는 Na형 faujasite 제올라이트 분리층을 다공성 $\alpha$-알루미나 튜브 표면에 수열조건에서 이차성장 시키고 $CO_2/N_2$ 분리거동을 $CO_2/N_2$ 몰비가 1인 혼합기체에 대하여 $30^{\circ}C$에서 평가하였다. 수열조건 중에서 수열용액 내의 $SiO_2$ 양은 형성된 제올라이트 분리층의 재료특성에 가장 큰 영향을 주는 변수임을 확인하였다. 즉, 수열용액 내의 $SiO_2$ 양이 증가함에 따라서 형성된 제올라이트 분리층의 Si/Al 몰비, 두께, 구조적 불완전성(discontinuity)은 동시에 증가하였다. 본 논문에서는 불완전한 치밀화에 의해 잔존하는 결정립간 공극(void), GIS Na-P1 상에 의해 형성된 균열(crack) 등 구조적 불완전성이 $CO_2/N_2$ 분리에 가장 큰 영향을 주는 재료특성이며, 투과부에서의 $CO_2$ 탈착이 전체 $CO_2$ 투과의 율속단계(rate-determining step)임을 확인하였다. Sodium type faujasite(FAU) zeolite layers with diverse materials characteristics(Si/Al ratio, thickness, and structural discontinuity) were hydrothermally grown on a porous $\alpha-Al_2O_3$ tube, and then the $CO_2/N_2$ separation was evaluated at $30^{\circ}C$ for an equimolar mixture of $CO_2$ and $N_2$. Among hydrothermal conditions, $SiO_2$ content in hydrothermal solution seriously affected materials characteristics: with an increment in the $SiO_2$ content, Si/Al ratio, thickness, and structural discontinuity of grown FAU zeolite layer simultaneously increased. The present study reveals that structural discontinuity(intercrystalline voids due to an incomplete densification and cracks induced by GIS Na-P1 phase) is the most important variable affecting the $CO_2/N_2$ separation. Also, it was suggested that the $CO_2$ desorption in permeate side be the rate-determining(slowest) step in the overall $CO_2$ permeation.
졸-겔법을 이용한 고체산화물연료전지의 전해질 박막 제조 및 가스 투과도
손희정,이혜종,임탁형,송락현,백동현,신동열,현상훈,Son, Hui-Jeong,Lee, Hye-Jong,Lim, Tak-Hyoung,Song, Rak-Hyun,Peck, Dong-Hyun,Shin, Dong-Ryul,Hyun, Sang-Hoon,Kilner, John 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.12
In this study, thin electrolyte layer was prepared by 8YSZ ($8mol\%$ Yttria-Stabilized Zirconia) slurry dip and sol coating onto the porous anode support in order to reduce ohmic resistance. 8YSZ polymeric sol was prepared from inorganic salt of nitrate and XRF results of xerogel powder exhibited similar results $(99.2\pm1wt\%)$ compared with standard sample (TZ-8YS, Tosoh Co.). The dense and thin YSZ film with $1{\mu}m$ thickness was synthesized by coating of 0.7M YSZ sol followed by heat-treatment at $600^{\circ}C$ for 1 h. Thin film electrolyte sintered at $1400^{\circ}C$ showed no gas leakage at the differential pressure condition of 3 atm.
EB-PVD법에 의해 제조된 YSZ 전해질의 전기적 특성
신태호,유지행,이시우,한인섭,우상국,현상훈,Shin, Tae-Ho,Yu, Ji-Haeng,Lee, Shiwoo,Han, In-Sub,Woo, Sang-Kuk,Hyun, Sang-Hoon 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.2
나노 코팅 기술로써 빠른 증착 속도와 미세구조 제어가 용이하여 항공기 엔진 부품 열차폐 코팅으로 널리 이용되는 Electron Beam Physical Vapor Deposition (EB-PVD)세라믹 코팅 기술을 연료전지 전해질 제조에 적용하였다. EB-PVD 법을 이용하여 NiO-YSZ 기판에 YSZ 전해질을 약 10$\mu$m의 두께로 짧은 시간에 코팅하였으며 증착온도에 따라 나노 구조의 표면을 가진 YSZ 막을 얻을 수 있었다. 연료전지 전해질로서의 특성을 평가하기 위하여, 같은 조건의 코팅으로 $Al_{2}O_3$기판에 전해질을 동일한 조건으로 코팅하여 전해질의 전기적 특성을 평가하였다. 또한 양극물질로서 $LaSrCoO_3$ 분말을 일반적인 스크린 프린팅 기법으로 코팅하여 EB-PVD의 코팅을 이용한 고체산화물 연료전지 제조 가능성에 대하여 논의하였다 Electron Beam Physical Vapor Deposition (EB-PVD) is a typical technology for thermal barrier coating with Yttria Stabilized Zirconia (YSZ) on aero gas turbine engine. In this study EB-PVD method was used to fabricate dense YSZ film on NiO-YSZ as a electrolyte of Solid Oxide Fuel Cell (SOFC). Dense YSZ films of -10 $\mu$m thickness showed nano surface structure depending on deposition temperature. Electrical conductivities of YSZ film and electric power density of the single cell were evaluated after screen- printing $LaSrCoO_3$ as a cathode.