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김형주,백필순 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-
In this study, we examine experimentally the characteristics of shearing strength of clay stratum as sand drain installation through triaxial compression test to be various a stability of ground such as consolidated time and consolidated settlement of clay stratum for vertical drain method's final purpose. For triaxial compression test, it makes up sample to extract soft clay only pure fat silt do re-agitation and re-molding in housing land development at Susungdong, Kunsan city. And then the sample compare with triaxial compression test of sample that do not installation the drain such as consolidation, stress, strain about 10%, 20% of displacement rate. Thus, it was compared or analyzed stress-strain of stand drain installation ground. In stress path, under all condition, It shows it typical normally consolidated clay trend, and appears type along down failure envelope line (Kf line), in case of Drain displacement rate show bigger, slope more bigly. Therefore, When the drain installs, cohension does not in crease highly. However, Friction highly increase. As a result, the drain installations increase a strength by it self.
So-Yeon Kim(So-Yeon Kim),Hyeong-Gi Kim(Hyeong-Gi Kim),Pil-Young Yun(Pil-Young Yun),Young-Kyun Kim(Young-Kyun Kim) 대한구강악안면외과학회 2023 대한구강악안면외과학회지 Vol.49 No.1
Objectives: Ultra-wide implants may be used as a replacement if existing implants fail. This study was conducted to evaluate the factors influencing the prognosis and failure of ultra-wide implants. Patients and Methods: This study evaluated whether sex, age, site, diameter, length, additional surgery, implant stability (primary and secondary), and reason for ultra-wide implant placement affect the 5-year survival and success rates and marginal bone loss (MBL) of ultra-wide implants. Seventy- eight ultra-wide implants that were placed in 71 patients (39 males and 32 females) from 2008 to 2010 were studied. One-way ANOVA analysis was conducted to evaluate the statistical significance of MBL according to the patient’s sex, implant site, and diameter. Independent sample t -tests were used to determine the statistical significance of MBL analysis which was used to determine the significance of the 5-year success and survival rates related to the variables. One-way ANOVA was conducted to evaluate the statistical significance of sex, implantation site, diameter, and MBL. Independent sample t -tests were used to evaluate the correlation between implantability and MBL for implantation reasons, while additional surgery, length, and Kaplan-Meier analysis were used to evaluate 5-year survival and success rates. Results: The mean age of patients was 54.2 years with a survival rate of 92.3% and a success rate of 83.3% over a mean 97.8-month period of observation. MBL averaged 0.2 mm after one year of prosthetic function loading and 0.54 mm at the time of final observation. Success rates correlated with primary stability (P=0.045), survival rates correlated with secondary stability (P=0.036), and MBL did not correlate with any variables. Conclusion: Ultra-wide implants can be used to achieve secure initial fixation in the maxillary and mandibular molar regions with poor bone quality or for alternative purposes in cases of previous implant failure.
Photomask Effect in Organic Solar Cells With ZnO Cathode Buffer Layer
Hyeong Pil Kim,Mi Sun Ryu,Jun Ho Youn,bin Mohd Yusoff, A. R.,Jin Jang IEEE 2012 IEEE electron device letters Vol.33 No.10
<P>In this letter, we report on the performance of conventional bulk heterojunction organic solar cell (OSC) incorporating a solution-processed zinc oxide (ZnO) spin coated on the photoactive layer regioregular poly(3-hexylthiophene):indene-C<SUB>60</SUB> bis adduct. We show a significant improvement in short-circuit current density (<I>J</I><SUB>sc</SUB>) upon an introduction of ZnO, and this is further evidenced by the reduction of <I>J</I><SUB>sc</SUB> leading to a lower PCE in the device without the presence of ZnO. Furthermore, we also examined the “photomask” on the performance of ZnO-based device yielding a decrease in both <I>J</I><SUB>sc</SUB> and open-circuit voltage <I>V</I><SUB>oc</SUB> (of about 13.42% and 0.73%, respectively) but an increase in filling factor. Results demonstrate that ZnO plays an important role in the improvement of OSCs' performance.</P>
Inverted organic photovoltaic device with a new electron transport layer
Kim, Hyeong Pil,Yusoff, Abd Rashid bin Mohd,Kim, Hyo Min,Lee, Hee Jae,Seo, Gi Jun,Jang, Jin Springer 2014 NANOSCALE RESEARCH LETTERS Vol.9 No.1
<P>We demonstrate that there is a new solution-processed electron transport layer, lithium-doped zinc oxide (LZO), with high-performance inverted organic photovoltaic device. The device exhibits a fill factor of 68.58%, an open circuit voltage of 0.86 V, a short-circuit current density of −9.35 cm/mA<SUP>2</SUP> along with 5.49% power conversion efficiency. In addition, we studied the performance of blend ratio dependence on inverted organic photovoltaics. Our device also demonstrates a long stability shelf life over 4 weeks in air.</P>
Effect of ZnO:Cs <sub>2</sub> CO <sub>3</sub> on the performance of organic photovoltaics
Kim, Hyeong Pil,Yusoff, Abd Rashid bin Mohd,Lee, Hee Jae,Lee, Seung Joo,Kim, Hyo Min,Seo, Gi Jun,Youn, Jun Ho,Jang, Jin Springer 2014 NANOSCALE RESEARCH LETTERS Vol.9 No.1
<P>We demonstrate a new solution-processed electron transport layer (ETL), zinc oxide doped with cesium carbonate (ZnO:Cs<SUB>2</SUB>CO<SUB>3</SUB>), for achieving organic photovoltaics (OPVs) with good operational stability at ambient air. An OPV employing the ZnO:Cs<SUB>2</SUB>CO<SUB>3</SUB> ETL exhibits a fill factor of 62%, an open circuit voltage of 0.90 V, and a short circuit current density of −6.14 mA/cm<SUP>2</SUP> along with 3.43% power conversion efficiency. The device demonstrated air stability for a period over 4 weeks. In addition, we also studied the device structure dependence on the performance of organic photovoltaics. Thus, we conclude that ZnO:Cs<SUB>2</SUB>CO<SUB>3</SUB> ETL could be employed in a suitable architecture to achieve high-performance OPV.</P>
Hyeong Pil Kim,Seung Joo Lee,Bin Mohd Yusoff, Abd Rashid,Jin Jang IEEE 2015 IEEE journal of photovoltaics Vol.5 No.3
<P>We report the effects of postannealing on the photovoltaic performance of ITO/LZO/P3HT:ICBA/PEDOT:PSS: WO<SUB>x</SUB>/Al. The electrical characteristics of the PEDOT:PSS:WO<SUB>x</SUB> film can be controlled through an annealing treatment, which exhibits a short-circuit current density of 9.37 mA/cm<SUP>2</SUP>, an open-circuit voltage of 0.86V, and a power conversion efficiency of 5.54% under AM1.5 illumination (100 mW/cm<SUP>2</SUP>). By annealing the device at 150°C, a favorable phase separation in the PEDOT:PSS:WO<SUB>x</SUB> is obtained, and the PCE increases by 23.27% compared with that of the nonannealed device. The V<SUB>oc</SUB> increases with the annealing temperature, and it is worth noting that the PEDOT:PSS device only experienced a 2.40% decrease in PCE after 150°C annealing treatment.</P>
Performance Comparison of Different GPS L-Band Dual-Frequency Signal Processing Technologies
Kim, Hyeong-Pil,Jeong, Jin-Ho,Won, Jong-Hoon The Institute of Positioning 2018 Journal of Positioning, Navigation, and Timing Vol.7 No.1
The Global Positioning System (GPS) provides more accurate positioning estimation performance by processing L1 and L2 signals simultaneously through dual frequency signal processing technology at the L-band rather than using only L1 signal. However, if anti-spoofing (AS) mode is run at the GPS, the precision (P) code in L2 signal is encrypted to Y code (or P(Y) code). Thus, dual frequency signal processing can be done only when the effect of P(Y) code is eliminated through the L2 signal processing technology. To do this, a codeless technique or semi-codeless technique that can acquire phase measurement information of L2 signal without information about W code should be employed. In this regard, this paper implements L2 signal processing technology where two typical codeless techniques and four typical semi-codeless techniques of previous studies are applied and compares their performances to discuss the optimal technique selection according to implementation environments and constraints.
Organic photovoltaic solar cells with cathode modified by ZnO.
Kim, Hyeong Pil,Yusoff, Abd Rashid Bin Mohd,Jang, Jin American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.7
<P>Solution processed cathode organic photovoltaic cells (OPVs) utilizing thin layer of ZnO with 27% increase in power conversion efficiency (PCE) to control devices have been demonstrated. Devices without the presence of ZnO layer have much lower PCE than the ones with ZnO layer. Cathode modification layer can be used to reduce photogenerated excitions and finally improve the performance of the OPVs. The successful demonstrations of OPVs with an introduction of ZnO cathode layer give promise of further device progresses.</P>