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CO2/CH4 separation using inside coated thin film composite hollow fiber membranes prepared by interfacial polymerization

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Chinese Journal of Chemical Engineering 2017年第3期25卷 278-287页

作者： Eun-sung Jo Xinghai An Pravin G.Ingole Won-Kil Choi yeong-sung Park Hyung-Keun Lee Korea Institute of Energy Research(KIER) 71-2 Jang-dongYuseong-guDaejeon 205343Republic of Korea Department of Environmental Engineering Daejeon UniversityDaejeonRepublic of Korea Department of Advanced Energy and Technology University of Science and Technology(UST)217 Gajeong-roYuseong-guDaejeon 305-350Republic of Korea

Carbon dioxide(CO_2) is greenhouse gas which originates primarily as a main combustion product of biogas and landfill gas. To separate this gas, an inside coated thin film composite(TFC) hollow fiber membrane was developed by interfacial polymerization between 1,3–cyclohexanebis–methylamine(CHMA) and trimesoyl chloride(TMC). ATR-FTIR, SEM and AFM were used to characterize the active thin layer formed inside the PSf hollow fiber. The separation behavior of the CHMA-TMC/PSf membrane was scrutinized by studying various effects like feed gas pressure and temperature. Furthermore, the influence of CHMA concentration and TMC concentration on membrane morphology and performance were investigated. As a result, it was found that mutually the CHMA concentration and TMC concentration play key roles in determining membrane morphology and performance. Moreover, the CHMA-TMC/PSf composite membrane showed good CO_2/CH_4 separation performance. For CO_2/CH_4 mixture gas(30/70 by volume) test, the membrane(PD1 prepared by CHMA 1.0% and TMC 0.5%) showed a CO_2 permeance of 25 GPU and the best CO_2/CH_4 selectivity of 28 at stage cut of 0.1. The high CO_2/CH_4 separation performance of CHMA-TMC/PSf thin film composite membrane was mostly accredited to the thin film thickness and the properties of binary amino groups.

关键词： Thin-film composite hollow fiber membrane Interfacial polymerization CHMA/TMC CO2/CH4 separation

Comments to young surgeons concerning laparoscopic spleenpreserving D2 lymph node dissection for advanced gastric cancer on the upper body

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Chinese Journal of Cancer Research 2014年第3期26卷 231-233页

作者： Yoon Young Choi Ji yeong An Woo Jin Hyung sung Hoon Noh Department of Surgery Yonsei University Health System Yonsei University College of Medicine

Qualified radical gastrectomy with lymph node dissection is very important to the prognosis of patients with gastric cancer. Now D2 lymph node dissection is standard procedure for gastric cancer surgery, and spleen hilar lymph node dissection is mandatory for gastric cancer in upper body. Because the anatomy of vessels in this area is very complicated, D2 lymph node dissection is technical challenging not only for open gastrectomy but also for laparoscopic one. Adapting a new technique is important to all surgeons, but we surgeons should always consider a patient＇s safety as the most important factor during surgery and that efforts should be based on scientific rationale with oncologic principles. I hope that the recent report by Huang et al. about laparoscopic spleen preserving hilar lymph node dissection would be helpful to young surgeons who will perform laparoscpic total gastrectomy for gastric cancer.

关键词： Gastric cancer lymph node dissection laparoscopy spleen

A facile one-step approach to hierarchically assembled core-shell-like MnO2@MnO2 nanoarchitectures on carbon fibers： An efficient and flexible electrode material to enhance energy storage

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Nano Research 2016年第5期9卷 1507-1522页

作者： Goli Nagaraju yeong Hwan Ko sung Min Cha Sang Hyuk Im Jae Su Yu Department of Electronics and Radio Engineering Institute for Wearable Convergence Electronics Kyung Hee University 1732 Deogyeong-daero Giheung-gu Yongin-si Gyeonggi-do 446-701 Republic of Korea Functional Crystallization Center (ERC) Department of Chemical Engineering Kyung Hee University 1732 Deogyeong-daeroGiheuncl-qu Yonqin-si Gyeonqqi-do 446-701 Republic of Korea

Hierarchical core-shell-like MnO2 nanostructures （NSs） were used to anchor MnO2 hexagonal nanoplate arrays （HNPAs） on carbon cloth （CC） fibers. The NSs were prepared by a novel one-step electrochemical deposition method. Under an external cathodic voltage of -2.0 V for 30 min, hierarchical core-shell-like MnO2-NS-decorated MnO2 HNPAs （MnO2 NSs@MnO2 HNPAs） were uniformly grown on CC with reliable adhesion. The phase purity and morphological properties of the samples were characterized by various physicochemical techniques. At a constant external cathodic voltage, growth of MnO2 NSs@MnO2 HNPAs on CC was carried for different time periods. When utilized as a flexible, robust, and binder-free electrode for pseudocapacitors, the hierarchical core-shell-like MnO2 NSs@MnO2 HNPAs on CC showed clearly enhanced electrochemical properties in 1 M Na2SO4 electrolyte solution. The results indicate that the MnO2 NSs@MnO2 HNPAs on CC have a maximum specific capacitance of 244.54 F/g at a current density of 0.5 A/g with excellent cycling stability compared to that of bare MnO2 HNPAs on CC （112.1 F/g at 0.5 A/g current density）. We believe that the superior charge storage performance of the pseudocapacitive electrode can be mainly attributed to the hierarchical MnO2 NSs@MnO2 HNPAs building blocks that have a large specific surface area, offering additional electroactive sites for efficient electrochemical reactions. The facile and single-step approach to growth of hierarchical pseudocapacitive materials on textile based electrodes opens up the possibility for the fabrication of high-performance flexible energy storage devices.

关键词： manganese oxide hierarchical structures carbon cloth electrochemical deposition energy storage properties

A new technique of ganglion impar pulsed radiofrequency ablation

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Chinese Medical Journal 2021年第10期134卷 1221-1223页

作者： Ji yeong Kim sung Eun Sim Subin Yoo Mina Joo Hue Jung Park Department of Anesthesiology and Pain Medicine Seoul St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 06591Republic of Korea

The ganglion impar block was first introduced in 1990 by Plancarte et al.[1]Since then,several modified versions have been reported by Wemm and Saberski,[2]Nebab and Florence,[3]and Foye.[4]They tried to reduce pain effectively by considering the anatomy of the ganglion impar and *** were differences in the strengths of each individual’s ***,owing to the anatomical diversity of the structure itself,[5]it was difficult to determine which technique would be more *** ablation(RFA)developed in the ganglion impar block also faced this *** this clinical background,we present a new technique to implement ganglion impar *** informed consent was obtained from the patient before the initiation of the study.

关键词： anatomy technique. al.

Improved Hybrid Beamforming for mmWave Multi-User Massive MIMO

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Computers, Materials & Continua 2021年第6期67卷 3057-3070页

作者： Ji-sung Jung Won-Seok Lee yeong-Rong Lee Jaeho Kim Hyoung-Kyu Song Department of Information and Communication Engineering and Convergence Engineering for Intelligent Drone Sejong UniversitySeoul05006Korea Department of Electrical Engineering Sejong UniversitySeoul05006Korea

Massive multiple input multiple output(MIMO)has become essential for the increase of capacity as the millimeter-wave(mmWave)communication is ***,hybrid beamforming systems have been studied since full-digital beamforming is impractical due to high cost and power consumption of the radio frequency(RF)*** paper proposes a hybrid beamforming scheme to improve the spectral efciency for multi-user MIMO(MU-MIMO)*** a frequency selective fading environment,hybrid beamforming schemes suffer from performance degradation since the analog precoder performs the same precoding for all *** mitigate performance degradation,this paper uses the average channel covariance matrix for all subcarriers and considers an iterative algorithm to design analog precoder using approximation *** analog precoder is iteratively updated for each column until it *** proposed scheme can reduce errors in the approximating process of the overall spectral *** scheme can be applied to fully-connected and partially-connected *** simulation results show that spectral efciency performance for the proposed scheme is better than the conventional *** proposed scheme can achieve similar performance with full-digital beamforming by using a sufciently large number of RF ***,this paper shows that the proposed scheme outperforms other schemes in the frequency selective fading *** performance improvement can be achieved in both structures.

关键词： Hybrid precoding massive MIMO MU-MIMO mmwave frequency selective fading

Automatic salient object segmentation using saliency map and color segmentation

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Journal of Central South University 2013年第9期20卷 2407-2413页

作者： HAN sung-ho JUNG Gye-dong LEE Sangh-yuk HONG yeong-pyo LEE Sang-hun Department of Plasmabiodisplay Kwangwoon University Department of General Education Kwangwoon University Department of Electrical and Electronic Engineering Xi'an Jiaotong-Liverpool University Department of Hospital Management International University of Korea

A new method for automatic salient object segmentation is *** object segmentation is an important research area in the field of object recognition,image retrieval,image editing,scene reconstruction,and 2D/3D *** this work,salient object segmentation is performed using saliency map and color ***,color and intensity feature are extracted from mean shift segmentation(MSS)image,and saliency map is created using these *** average saliency per segment image is calculated using the color information from MSS image and generated saliency ***,second average saliency per segment image is calculated by applying same procedure for the first image to the thresholding,labeling,and hole-filling applied ***,labeling and hole-filling are applied to the mean image of the generated two images to get the final salient object *** effectiveness of proposed method is proved by showing 80%,89%and 80%of precision,recall and F-measure values from the generated salient object segmentation image and ground truth image.

关键词： salient object visual attention saliency map color segmentation

Growth and survival of blue swimming crab (<i>Portunus pelagicus</i>) reared on frozen and artificial foods

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Agricultural Sciences 2013年第6期4卷 76-82页

作者： Mhd Ikhwanuddin Mohamad N. Azra yeong yik sung Abol-Munafi Ambok Bolong Shabdin Mohd Long Faculty of Fisheries and Aqua-Industries Universiti Malaysia Terengganu Kuala Terengganu Malaysia Faculty of Science and Resource Technology Universiti Malaysia Sarawak Kota Samarahan Malaysia Institute of Tropical Aquaculture Universiti Malaysia Terengganu Kuala Terengganu Malaysia

Experiments were conducted to evaluate the efficacy of two frozen organism (with and without instant Nannochloropsis oculata and with and without instant encapsulated Spirulina) and artificial diet (with and without artificial encapsulated shrimp larvae feed) with live food as continues feed in the larval rearing of blue swimming crab, Portunus pelagicus. The larvae were conducted with six treatments and each treatment with three replications on newly one day hatched larvae in each replication. Results showed that these larvae fed with a combination diet of instant frozen N. oculata, Artemia nauplii and rotifer give a higher survival rate till 1st day juvenile crab compared to the treatment with instant encapsulated Spirulina and artificial diet (with artificial encapsulated shrimp larvae feed). One of experiments treated with encapsulated Spirulina recorded only 16 days for the zoea to reach the C1, one day earlier as compared to previous trials treated with and without instant frozen N. oculata. One of the experiments treated with artificial encapsulated shrimp larvae feed recorded 18 days for the zoea to reach the C1, 1 to 2 days longer as compared to all the previous trials earlier. Food type influenced survival, development, and metamorphosis to megalopa and 1st day juvenile crab of P. pelagicus zoea larvae. Our findings illustrate that the best survival, the most rapid development and the highest number of 1st day juvenile crabs were obtained from larvae fed with a combination diet of frozen N. oculata, Artemia nauplii and rotifer from hatching till the 1st day juvenile crab.

关键词： Artificial Food Crab Frozen Food Growth Portunus pelagicus Survival

A comparison of short-term postoperative outcomes including nutritional status between gastrectomy with simultaneous cholecystectomy and gastrectomy only in patients with gastric cancer

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Chinese Journal of Cancer Research 2019年第3期31卷 443-452页

作者： You Na Kim Ji yeong An Min-Gew Choi Jun Ho Lee Tae sung Sohn Jae Moon Bae sung Kim Department of Surgery Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 06351Korea Department of Surgery Korea University Anam HospitalKorea University School of MedicineSeoul 02841Korea

Objective: We aimed to evaluate the effect of simultaneous cholecystectomy on the short-term postoperative outcomes and nutritional status in patients with gastric ***: We retrospectively reviewed data from 4,820 patients with gastric cancer who underwent gastrectomy from January 2011 to December 2016. Patients who underwent only gastrectomy(N=4,578) were matched to those who underwent simultaneous cholecystectomy during gastrectomy(N=242) at a 1:1 ratio using propensity score matching analysis. The nutritional status and inflammatory responses preoperatively and postoperatively and postoperative outcomes were compared between the ***: The simultaneous cholecystectomy group showed more intraoperative blood loss and a longer operative time than the gastrectomy only group [150.0(100.0, 200.0) m L vs. 100.0(100.0, 200.0) m L, P=0.006;176.0(150.0,210.0) min vs. 155.0(128.0, 188.0) min, P<0.001, respectively]. Intraoperative event rate, postoperative complication rate, and postoperative recovery did not differ between the groups. All parameters including body weight, the hemoglobin level, absolute lymphocyte count, total protein level, albumin level, fasting glucose level,and prognostic nutritional index excluding the cholesterol level were not significantly different between the groups,and their changing patterns were similar. Although the cholesterol level was significantly lower in the simultaneous cholecystectomy group than in the gastrectomy only group at all follow-up points, the mean value of the decreased cholesterol level was within normal ***: In gastric cancer patients with gallbladder disease, simultaneous cholecystectomy is safe and not associated with additional nutritional loss.

关键词： Gastric cancer cholecystectomy nutritional status

Current practice of gastric cancer treatment

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Chinese Medical Journal 2014年第3期127卷 547-553页

作者： Yoon Young Choi Ji yeong An Hyung-Il Kim Jae-Ho Cheong Woo Jin Hyung sung Hoon Noh Department of Surgery Yonsei University Health System Yonsei University College of Medicine Seoul Republic of Korea

Objective The aim of this review was to overview the current practice of gastric cancer treatment including surgery and other adjuvant *** sources The review was based on data obtained from the published articles and main guidelines in the East and *** selection Articles with high level of evidence or current best evidence in each issue were selected to be *** Although varied adjuvant modalities have been proved to be benefit for treating gastric cancer,surgery is still the most important treatment strategy against gastric *** adapting to new technology is important but it should be balanced with an effort to establish sound scientific rationale that adheres to oncologic *** Future treatment of gastric cancer will be focused on tailored,personalized *** achieving it,collaboration across disciplines is *** the philosophy of caring for the patients with gastric cancer should be rooted in the realization of true patient benefit regardless of who is providing the *** these philosophies,we can shift the scientific and technological advances toward triumph over gastric cancer.

关键词： gastric cancer treatment oncology