한국직업방송의 이용용이성, 유용성이 이용의도에 미치는 영향

현상훈(Hyun, Sang-Hoon),윤동열(Yoon, Dong-Yeol) 대한경영학회 2017 大韓經營學會誌 Vol.30 No.11

이용용이성, 유용성이 한국직업방송의 만족도와 이용의도에 미치는 영향

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.

류마티스 관절염에서의 갑상선 질환의 빈도

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.

회원작품 - 은재네 돌담집

현상훈,Hyun, Sang-hoon 대한건축사협회 2015 建築士 Vol.2015 No.9

수계 테이프 케스팅 법에 의한 봉상 γ-LiAlO₂ 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.

CSG 재료의 압축강도 특성 및 동결융해 저항성

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.

Inhibitory Effect of Freeze-Dried Aronia Juice on Degranulation and Inflammatory Mediator Release in RBL-2H3 Cells

Seong Il Heo(허성일),Sang Hoon Hyun(현상훈),Sang Mi Jung(정상미),Hee Jeong Eom(엄희정),Moon Jin Ra(라문진) 한국약용작물학회 2019 한국약용작물학회 학술대회논문집 Vol.2019 No.1

연료극 지지형 고체산화물 연료전지의 전기화학적 특성

윤성필,한종희,남석우,임태훈,홍성안,현상훈,유영성,Yoon Sung Pil,Han Jonghee,Nam Suk Woo,Lim Tae-Hoon,Hong Seong-Ahn,Hyun Sang-Hoon,Yoo Young-Sung 한국전기화학회 2001 한국전기화학회지 Vol.4 No.2

기체/전해질/LSM $(La_{0.85}Sr_{0.15}MnO_3)$ 공기극이 만나는 삼상계면 (triple phase boundary) 주위에 YSZ ($8mol\%$ yttria stabilized zirconia) 코팅막 (coating film) 을 형성하여 추가로 삼상계면을 크게 늘린 새로운 전극 미세구조를 갖는 복합 공기극 (composite cathode) 을 개발하였다. 이 복합 공기극을 전해질 두께가 약 $30{\mu}m$인 연료극 (anode)v 지지체 위에 형성하여 $700\~800{\circ}C$의 온도에서 전류전압 특성 및 교류 임피던스 분석을 실시하였다. $800^{\circ}$, 공기 및 수소 조건에서 교류 임피던스 분석 결과 1000Hz주파수 영역을 대변하는 저항성분 R1은 연료극 분극 저항에 해당하였고 100Hz주파수 영역의 저항성분 R2는 공기극 분극 저항 성분, 그리고 10Hz이하 영역의 저항성분 R3는 전극을 통한 기체확산 저항성분으로 특히, 작동 조건인 공기 및 수소 분위기에서는 연료극 쪽 반응기체에 의한 기체확산 저항 성분임을 알 수 있었다. 전지성능 측정 결과 이 복합 공기극을 장착한 전지는 $800^{\circ}C$, 공기 및 산소 조건에서 각각 $0.55W/cm^2$ $1W/cm^2$의 높은 전지성능을 나타내었다. 전류전압 곡선은 기울기가 다른 두 구간으로 구분되었으며, 낮은 전류밀도 하에서 보이는 급격한 전압감소 구간은 공기극 분극저항이 주된 성능 저하의 원인인 반면, 높은 전류밀도 하에서 나타나는 완만한 전압 감소 구간은 전해질에 관련된 분극저항이 주된 성능 저하의 원인이었다. YSZ ($8mol\%$ yttria-stabilized zirconia)-modified LSM $(La_{0.85}Sr_{0.15}MnO_3)$ composite cathodes were fabricated by formation of YSZ film on triple phase boundary (TPB) of LSM/YSZ/gas. The YSZ coating film greatly enlarged electrochemical reaction sites from the increase of additional TPB. The composite cathode was formed on thin YSZ electrolyte (about 30 Um thickness) supported on an anode and then I-V characterization and AC impedance analyses were performed at temperature between $700^{\circ}C\;and\;800^{\circ}C$. As results of the impedance analysis on the cell at $800^{\circ}C$ with humidified hydrogen as the fuel and air as the oxidant, R1 around the frequency of 1000 Hz represents the anode Polarization. R2 around the frequency of 100Hz indicates the cathode polarization, and R3 below the frequency of 10 Hz is the resistance of gas phase diffusion through the anode. The cell with the composite cathode produced power density of $0.55\;W/cm^2\;and\;1W/cm^2$ at air and oxygen atmosphere, respectively. The I-V curve could be divided into two parts showing distinctive behavior. At low current density region (part I) the performance decreased steeply and at high current density region (part II) the performance decreased gradually. At the part I the performance decrease was especially resulted from the large cathode polarization, while at the part H the performance decrease related to the electrolyte polarization.

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.

Secondary Growth of Sodium Type Faujasite Zeolite Layers on a Porous $\alpha-Al_2O_3$ Tube and the $CO_2/N_2$ Separation

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.