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Im, Kyungmin,Heo, Jin Hyuck,Im, Sang Hyuk,Kim, Jinsoo Elsevier 2017 Chemical Engineering Journal Vol. No.
<P><B>Abstract</B></P> <P>Ti doped MoO<SUB>2</SUB> nanoparticles with high BET surface area of 135m<SUP>2</SUP>/g were synthesized via scalable solvothermal cracking of polycrystalline MoO<SUB>3</SUB> microparticles prepared by ultrasonic spray pyrolysis. The pristine MoO<SUB>2</SUB> and Ti doped MoO<SUB>2</SUB> nanoparticles showed metallic conductivity, whereas the MoO<SUB>3</SUB> microparticles had semi-conducting behavior. In addition, the Ti doping in MoO<SUB>2</SUB> nanoparticles formed stronger MoO bond than the pristine MoO<SUB>2</SUB> and consequently exhibited improved stability against humidity. Accordingly, the p-i-n type planar CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite solar cells with Ti doped MoO<SUB>2</SUB> inorganic hole transporting material showed 15.8% of power conversion efficiency at 1 Sun condition (100mW/cm<SUP>2</SUP>) and significantly improved humidity stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly stable Ti-doped MoO<SUB>2</SUB> nanoparticles were synthesized by solvo-thermal cracking process. </LI> <LI> The p-type Ti-doped MoO<SUB>2</SUB> was used to hole transporting materials for perovskite solar cells. </LI> <LI> The stability of CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite solar cell was enhanced. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A Highly Efficient and Fast Algorithm for Implementing a Real-Time Software GNSS Receiver
Sung-Hyuck Im,Gyu-In Jee,Hak-Sun Kim,Sang-Do Cho,Sun-Jun Ko 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2 No.-
In this paper, for implementing a real-time software GNSS receiver we propose the highly efficient and fast algorithms such as partial down-conversion, phase rotator, composite I&Q accumulation, Virtual DCO technique, and parallel acquisition using FFT. When the proposed algorithms are used, more 30 tracking channels with 3 tracking arm(early-prompt-late) is operated real-time on Intel 2.8GHz personal computer. Also, the partial down-conversion reduces the FFT size, for parallel acquisition, to 1/8 of conventional FFT-size and the program size includes map is not exceed 1Mbyte. Finally, the proposed real-time software GNSS receiver using the proposed algorithms provides the navigation solution with below 10 meter rms error.
Software-based Real-time GNSS Signal Generation and Processing Using a Graphic Processing Unit (GPU)
Im, Sung-Hyuck,Jee, Gyu-In The Institute of Positioning 2014 Journal of Positioning, Navigation, and Timing Vol.3 No.3
A graphic processing unit (GPU) can perform the same calculation on multiple data (SIMD: single instruction multiple data) using hundreds of to thousands of special purpose processors for graphic processing. Thus, high efficiency is expected when GPU is used for the generation and correlation of satellite navigation signals, which perform generation and processing by applying the same calculation procedure to tens of millions of discrete signal samples per second. In this study, the structure of a GPU-based GNSS simulator for the generation and processing of satellite navigation signals was designed, developed, and verified. To verify the developed satellite navigation signal generator, generated signals were applied to the OEM-V3 receiver of Novatel Inc., and the measured values were examined. To verify the satellite navigation signal processor, the performance was examined by collecting and processing actual GNSS intermediate frequency signals. The results of the verification indicated that satellite navigation signals could be generated and processed in real time using two GPUs.
3D LIDAR Based Vehicle Localization Using Synthetic Reflectivity Map for Road and Wall in Tunnel
Im, Jun-Hyuck,Im, Sung-Hyuck,Song, Jong-Hwa,Jee, Gyu-In The Institute of Positioning 2017 Journal of Positioning, Navigation, and Timing Vol.6 No.4
The position of autonomous driving vehicle is basically acquired through the global positioning system (GPS). However, GPS signals cannot be received in tunnels. Due to this limitation, localization of autonomous driving vehicles can be made through sensors mounted on them. In particular, a 3D Light Detection and Ranging (LIDAR) system is used for longitudinal position error correction. Few feature points and structures that can be used for localization of vehicles are available in tunnels. Since lanes in the road are normally marked by solid line, it cannot be used to recognize a longitudinal position. In addition, only a small number of structures that are separated from the tunnel walls such as sign boards or jet fans are available. Thus, it is necessary to extract usable information from tunnels to recognize a longitudinal position. In this paper, fire hydrants and evacuation guide lights attached at both sides of tunnel walls were used to recognize a longitudinal position. These structures have highly distinctive reflectivity from the surrounding walls, which can be distinguished using LIDAR reflectivity data. Furthermore, reflectivity information of tunnel walls was fused with the road surface reflectivity map to generate a synthetic reflectivity map. When the synthetic reflectivity map was used, localization of vehicles was able through correlation matching with the local maps generated from the current LIDAR data. The experiments were conducted at an expressway including Maseong Tunnel (approximately 1.5 km long). The experiment results showed that the root mean square (RMS) position errors in lateral and longitudinal directions were 0.19 m and 0.35 m, respectively, exhibiting precise localization accuracy.
Three Cases of Synchronous Solid Tumor and Multiple Myeloma
Sang Hoon Ji,이지연,Mi Jung Oh,Keun Woo Park,Kihyun Kim,정철원,Young-Hyuck Im,Keunchil Park,oon Oh Park,임도형,Se-Hoon Lee,Young Suk Park,Mark H Lee,박병배,Won Seog Kim,Won Ki Kang 대한암학회 2004 Cancer Research and Treatment Vol.36 No.5
The association between a multiple myeloma and a secondary solid tumor is not well established. Some reports showed an increased risk of secondary solid neoplasms in multiple myeloma patients, but others have not. Three cases of the synchronous occurrence of multiple myelomas and solid tumors, namely, a small cell carcinoma of the lung, an adenocarcinoma of the colon and a squamous carcinoma of the pyriform sinus were experienced at our hospital. Therefore, herein is reported the clinical courses and treatment results. The stage of multiple myeloma was Durie-Salmon stage I in all of three cases; therefore, the solid tumors were treated as a primary target because the prognosis of early stage multiple myeloma is generally better than that of advanced solid tumor, while a smoldering or stage I myeloma do not need primary therapy until progression of the multiple myeloma. Two patients died of their solid tumors, but one patient is alive. (Cancer Res Treat. 2004;36:338-340)
Esophageal Squamous Cell Carcinoma Recurring as a Solitary Renal Mass
임도형,Sang Hoon Ji,박병배,이지연,Keun Woo Park,Joon-Oh Park,Kihyun Kim,정철원,Young Suk Park,Won Ki Kang,Kwanmien Kim,Young Mog Shim,Young-Hyuck Im,Mi Jung Oh,Se-Hoon Lee,Won Seog Kim,Mark H Lee,Keunchil Park 대한암학회 2004 Cancer Research and Treatment Vol.36 No.4
Herein, a case of solitary, unilateral renal metastasis in a patient with curatively resected thoracic esophageal carcinoma, who achieved a pathological complete remission after neoadjuvant concurrent chemoradiotherapy, is reported. The kidney is the 4th or 5th most common visceral metastasis site of a primary esophageal carcinoma. More than 50& of renal metastases typically show bilateral involvement. Solitary, unilateral renal metastasis is extremely rare. Renal metastases from a primary esophageal carcinoma are usually latent and its diagnosis is very unusual in a live patient. The solitary renal metastasis in this case was not accompanied by metastases to other sites. The value of a nephrectomy in solitary renal metastasis of esophageal cancer is not known due to the rarity of such cases. A nephrectomy could be justified in limited situations, such as with uncertainty of histological diagnosis, severe life-threatening hematuria, which cannot be controlled by embolization, or solitary renal metastasis with a long disease-free interval.(Cancer Res Treat. 2004;36:271-274)
Lee, Sung-Hyun,Park, Junbeom,Kim, Hye-Rim,Lee, Taeseon,Lee, Jaegeun,Im, Yong-O.,Lee, Cheol-Hun,Cho, Hyunjung,Lee, Hyeseon,Jun, Chi-Hyuck,Ahn, Yu-Chan,Lee, In-Beum,Lee, Kun-Hong Elsevier 2016 Carbon Vol.100 No.-
<P>The optimum synthesis conditions for carbon nanotube (CNT) fibers were investigated using the Design of Experiment (DOE) technique. Direct spinning processes are governed by a variety of experimental factors: the methane flow rate, ferrocene flow rate, sulfur flow rate, hydrogen flow rate, water flow rate, and reaction temperature. The process was optimized in two stages that addressed first the Fractional Factorial Design (FFD) and then the Response Surface Methodology (RSM). Results from each experiment were classified according to a 6-step rating system: nothing(1), black gas(2), dust(3), ribbon or film(4), fiber(5), or continuous fiber(6). In the first step, three major factors (methane, sulfur, temperature) were identified as important among the six experimental factors tested using FFD. The effects of the major factors and the interactions were analyzed through the main effect plot and the interaction plot. In the second step, the experimental conditions were optimized using a model equation derived from Box-Behnken design experiments. Finally, the CNT fibers were continuously synthesized under the optimum conditions. The synthesized CNT fibers mainly consisted of single-walled CNTs (SWCNTs) 1.2 -3.8 nm in diameter. The I-G/I-D ratio of the CNT fibers was 48. This work provides a useful methodology for synthesizing the CNT fibers. (C) 2016 Elsevier Ltd. All rights reserved.</P>