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Distinctive clinical features of spontaneous pneumoperitoneum in neonates: A retrospective analysis

World Journal of Clinical Cases 2022年第23期10卷 8124-8132页

作者： Soo-Hong Kim yong-hoon cho Hae-Young Kim Department of Surgery Pusan National University Yangsan HospitalPusan National University School of MedicineYangsan 50612South Korea Research Institute for Convergence of Biomedical Science and Technology Pusan National University Yangsan HospitalYangsan 50612South Korea

BACKGROUND Spontaneous pneumoperitoneum(SP) without gastrointestinal perforation rarely occurs in neonates, with most SP cases being idiopathic. Although SP usually follows a benign clinical course with favorable prognosis, it can become lifethreatening in certain situations. In these cases, urgent surgical intervention may be required. Therefore, it may be difficult to decide when or how to perform prompt *** To demonstrate the distinct clinical features of SP to guide appropriate management by comparing characteristics between SP and typical pneumoperitoneum secondary to gastrointestinal *** We retrospectively reviewed electronic medical records and identified 37 neonates with radiological evidence of pneumoperitoneum who were treated at our institution. Clinical variables were compared between neonates with SP without gastrointestinal perforation(Group A) and those with pneumoperitoneum secondary to gastrointestinal perforation(Group B). Clinical variables between groups were compared using Student’s t-test and the chi-square test. The risk factors related to mortality were examined using multi-logistic regression *** Group A comprised 35.1%(13/37) of the patients. The frequency of persistent pulmonary hypertension(53.8%) and pneumothorax(46.2%) before the development of pneumoperitoneum was significantly higher in group A than in group B(P =0.004). Platelet count and partial pressure of arterial oxygen(PaO) were significantly lower in group A(P = 0.015 and 0.025, respectively). Overall mortality was significantly higher in group A than in group B(76.9% vs 16.7%, P = 0.001). Only preterm infants were significantly associated with high mortality(P = 0.041;odds ratio = 18.0). Accompaniment with persistent pulmonary hypertension and pneumothorax were also significantly high(P = 0.004) in group A, but these were not strongly associated with high *** This study identified a higher mortality rate in patients w

关键词： Spontaneous pneumoperitoneum Thrombocytopenia Persistent pulmonary hypertension Pneumothorax Preterm

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Surgical perspectives of symptomatic omphalomesenteric duct remnants: Differences between infancy and beyond

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World Journal of Clinical Cases 2021年第36期9卷 11228-11236页

作者： Ayoung Kang Soo-Hong Kim yong-hoon cho Hae-Young Kim Department of Surgery Pusan National University Yangsan HospitalYangsan 50612South Korea Department of Surgery Pusan National University School of MedicineYangsan 50612South Korea Research Institute for Convergence of Biomedical Science and Technology Pusan National University Yangsan HospitalYangsan 50612South Korea

BACKGROUND The clinical manifestations of omphalomesenteric duct remnant(OMDR)can vary with the age at diagnosis,from asymptomatic incidental findings to symptoms related to gastrointestinal *** lifelong complication rates are reported as 4%-34%,and complications are more common in patients younger than 2 years of *** authors attempted to identify different clinical features and management for the various pediatric age *** To find surgical perspectives for the pediatric age-related variants of OMDR and make recommendations for optimal *** The medical records of pediatric patients diagnosed with OMDR were reviewed *** patients diagnosed based on incidental findings during other surgeries were *** patients were divided into two groups based on age:12 mo(beyond infancy).We analyzed the demographic characteristics,clinical manifestations,diagnostic tools,surgical procedures,and clinical outcomes of the patients and compared them for the age ***-squared and Fisher's exact tests were used for nominal scales and a Mann-Whitney test was used for ratio *** A total of 35 patients(7 infants,28 children beyond infancy)were finally *** both groups,Meckel's diverticulum(MD)was the most common type of OMDR,while umbilical lesions were more common in the infant group(P=0.006).Hematochezia and abdominal pain were common in the beyond infancy group,while umbilical lesions were the most frequent symptoms in the infant *** diagnostic tools were used,but Meckel's scan was most useful in diagnosing OMDR in patients with painless rectal *** invasive surgery was more commonly performed for children than for infants(P=0.016).Single-incision laparoscopic surgery(SILS)was performed for fifteen patients who underwent laparoscopic *** were only three cases of postoperative complications,and all patients survived in good *** The cli

关键词： Omphalomesenteric duct remnant Age Surgical Meckel's diverticulum Single-incision laparoscopic surgery Children

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Electrically driven, phosphor-free, white light-emitting diodes using gallium nitride-based double concentric truncated pyramid structures

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Light(Science & Applications) 2016年第1期5卷 665-670页

作者： Seung-Hyuk Lim Young-Ho Ko Christophe Rodriguez Su-Hyun Gong yong-hoon cho Department of Physics and KI for the NanoCentury Korea Advanced Institute of Science and Technology291 Daehak-roYuseong-guDaejeon 34141Korea Electronics and Telecommunications Research Institute(ETRI) 218 Gajeong-roYuseong-guDaejeon 34129Korea The Laboratoire Nanotechnologies Nanosystémes(LN2)-CNRS UMI-3463 Institut Interdisciplinaire d’Innovation Technologique(3IT)Universitéde Sherbrooke3000 boulevard UniversitéJ1K 0A5QCCanada

White light-emitting diodes(LEDs)are becoming an alternative general light source,with huge energy savings compared to conventional ***,white LEDs using phosphor(s)suffer from unavoidable Stokes energy converting losses,higher manufacturing cost,and reduced thermal ***,we demonstrate electrically driven,phosphor-free,white LEDs based on three-dimensional gallium nitride structures with double concentric truncated hexagonal *** electroluminescence spectra are stable with varying *** origin of the emission wavelength is studied by cathodoluminescence and high-angle annular dark field scanning transmission electron microscopy *** variation of the carrier injection efficiency is also investigated by a comparative analysis between spatially resolved photoluminescence and electroluminescence.

关键词： indium gallium nitride light-emitting diodes phosphor-free three-dimensional structures white color

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Deep-learning-based gas identification by timevariant illumination of a single micro-LEDembedded gas sensor

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Light(Science & Applications) 2023年第5期12卷 826-837页

作者： Incheol cho Kichul Lee Young Chul Sim Jae-Seok Jeong Minkyu cho Heechan Jung Mingu Kang yong-hoon cho Seung Chul Ha Kuk-Jin Yoon Inkyu Park Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea Department of Physics Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea SENKO Co. Ltd.485Oesammi-DongOsan-SiGyeonggil-Do 18111Republic of Korea

Electronic nose(e-nose)technology for selectively identifying a target gas through chemoresistive sensors has gained much attention for various applications,such as smart factory and personal health *** overcome the crossreactivity problem of chemoresistive sensors to various gas species,herein,we propose a novel sensing strategy based on a single micro-LED(μLED)-embedded photoactivated(μLP)gas sensor,utilizing the time-variant illumination for identifying the species and concentrations of various target gases.A fast-changing pseudorandom voltage input is applied to the μLED to generate forced transient sensor responses.A deep neural network is employed to analyze the obtained complex transient signals for gas detection and concentration *** proposed sensor system achieves high classification(~96.99%)and quantification(mean absolute percentage error~31.99%)accuracies for various toxic gases(methanol,ethanol,acetone,and nitrogen dioxide)with a single gas sensor consuming 0.53 *** proposed method may significantly improve the efficiency of e-nose technology in terms of cost,space,and power consumption.

关键词： Deep illumination transient

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Effects of ciglitazone and troglitazone on the proliferation of human stomach cancer cells

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World Journal of Gastroenterology 2009年第3期15卷 310-320页

作者： Chan Woo Cheon Dae Hwan Kim Dong Heon Kim yong hoon cho Jae Hun Kim Department of Surgery School of MedicineMedical Research InstitutePusan National UniversityBusan 602-739South Korea

AIM:To determine the cytological and molecular effects of peroxisome proliferation-activated receptor(PPAR)-γ and PPAR-γ agonists on stomach cancer ***:To determine the proliferation-suppressive effects of troglitazone and ciglitazone,SNU-216 and SNU-668 stomach cancer cells were plated in media containing 40 μmol/L troglitazone and ciglitazone at a density of 1 × 104 cells/*** 3,5 and 7 d,the cells were counted with a *** assess the appearance of PPAR-γ,a reverse-transcription polymerase chain reaction analysis was *** day 7,Western blotting was used to determine the effects of troglitazone and ciglitazone on the expression of p21 and phosphorylated-ERK(pERK) *** cytometry analysis was used to determine which portion of the cell cycle was delayed when troglitazone was used to suppress cell *** order to clarify the mechanism underlying the activity of troglitazone,microarray analysis was ***:PPAR-γ was manifested in both SNU-216 and SNU-668 *** and troglitazone suppressed cell growth,and troglitazone was a stronger suppressor of stomach cancer cells than ciglitazone,an inducer of cell cycle arrest in the G1 ***-668 cells were also determined to be more sensitive to ciglitazone and troglitazone than SNU-216 *** troglitazone and ciglitazone were administered to stomach cancer cells,levels of p21 expression were increased,but ERK phosphorylation levels were *** GW9662,an antagonist of PPAR-γ,was applied in conjunction with ciglitazone and troglitazone,the cell growth suppression effect was *** gene transcription program revealed a variety of alterations as the consequence of troglitazone treatment,and multiple troglitazone-associated pathways were *** genes whose expression was increased by troglitazone treatment were associated with cell development,differentiation,signal transmission between cells,and cell adhesion,and were also associated

关键词： Peroxisome proliferating-activated receptor-γ Ciglitazone Troglitazone Stomach cancer cells

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Phase separations in graded-indium content InGaN/GaN multiple quantum wells and its function to high quantum efficiency

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Journal of Semiconductors 2012年第5期33卷 13-16页

作者：郭洪英孙元平 yong-hoon cho Eun-Kyung Suh Hai-Joon Lee Rak-Jun choi Yoon-Bong Hahn Institute of Science and Technology for Opto-Electronic Information Yantai University Department of Physics Korea Advanced Institute of Science and Technology School of Semiconductor and Chemical Engineering Semiconductor Physics Research CenterChonbuk National University School of Chemical Engineering Chonbuk National University

Phase separations have been studied for graded-indium content In_xGa_（1-x）N/GaN multiple quantum wells（MQWs） with different indium contents by means of photoluminescence（PL）,cathodeluminescence（CL） and time-resolved PL（TRPL） *** the main emission peaks,all samples show another 2 peaks at the high and low energy parts of the main peaks in PL when excited at 10 *** images show a clear contrast for 3 samples,which indicates an increasing phase separation with increasing indium *** spectra at 15 K of the main emissions show an increasing delay of rising time with indium content,which means a carrier transferring from low indium content structures to high indium content structures.

关键词： carrier transfer phase separation graded-indium content multiple quantum wells

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Enhanced light emission from AlGaN/GaN multiple quantum wells using the localized surface plasmon effect by aluminum nanoring patterns

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Photonics Research 2018年第1期9卷 30-36页

作者： KYUNG ROCK SON BYEONG Ryong LEE MIN HO JANG HYUN CHUL PARK yong hoon cho TAE GEUN KIM School of Electrical Engineering Korea University Anam-ro 145 Seongbuk-gu Seoul 02841 South Korea Department of Physics and KI for the NanoCentury Korea Advanced Institute of Science and Technology Daejeon 305-701 South Korea

We investigate the localized surface plasmon(LSP) effect by Al nanorings on the AlGaN/GaN multiple quantum well(MQW) structure emitting at 365 nm. For this experiment, first, the size of Al nanorings is optimized to maximize the energy transfer(or coupling) between the LSP and MQW using the silica nanospheres. Then, the Al nanorings with an outer diameter of 385 nm, which exhibit a strong absorption peak in the near-ultraviolet region, are applied to the top surface of the AlGaN/GaN MQW. The photoluminescence(PL) intensity of the MQW structure with Al nanorings increased by 227% at 365 nm compared to that without Al *** improvement is mainly attributed to an enhanced radiative recombination rate in the MQWs through the energy-matched LSPs by the temperature-dependent PL and time-resolved PL analyses. The radiative lifetime was about two times shorter than that of the structure without Al nanorings at room temperature. In addition, the measured PL efficiency at room temperature of the structure with Al nanorings was 33%, while that of the structure without Al nanorings was 19%, implying that LSP-QW coupling together with the nanoring array pattern itself played important roles in the enhancement.

关键词：等离子体通讯技术能量转移量子

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Progress of Materials and Devices for Neuromorphic Vision Sensors

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Nano-Micro Letters 2022年第12期14卷 239-271页

作者： Sung Woon cho Chanho Jo yong-hoon Kim Sung Kyu Park Department of Electrical and Electronics Engineering Chung-Ang UniversitySeoul 06974Republic of Korea Department of Advanced Components and Materials Engineering Sunchon National UniversitySunchŏnJeonnam 57922Republic of Korea School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan UniversitySuwon 16419Republic of Korea

The latest developments in bio-inspired neuromorphic vision sensors can be summarized in 3 keywords:smaller,faster,and smarter.(1)Smaller:Devices are becoming more compact by integrating previously separated components such as sensors,memory,and processing *** a prime example,the transition from traditional sensory vision computing to in-sensor vision computing has shown clear benefits,such as simpler circuitry,lower power consumption,and less data redundancy.(2)Swifter:Owing to the nature of physics,smaller and more integrated devices can detect,process,and react to input more *** addition,the methods for sensing and processing optical information using various materials(such as oxide semiconductors)are evolving.(3)Smarter:Owing to these two main research directions,we can expect advanced applications such as adaptive vision sensors,collision sensors,and nociceptive *** review mainly focuses on the recent progress,working mechanisms,image pre-processing techniques,and advanced features of two types of neuromorphic vision sensors based on near-sensor and in-sensor vision computing methodologies.

关键词： In-sensor computing Near-sensor computing Neuromorphic vision sensor Optoelectronic synaptic circuit Optoelectronic synapse

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Material properties of friction stir spot welded joints of dissimilar aluminum alloys

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中国有色金属学会会刊：英文版 2012年第S3期22卷 605-613页

作者： Chi-Sung JEON Sung-Tae HONG yong-Jai KWON hoon-Hwe cho Heung Nam HAN Technical Research Center Hyundai Steel Company School of Mechanical Engineering University of Ulsan Department of Materials Science and Engineering University of Ulsan Department of Materials Science and Engineering Seoul National University

Mechanical properties and material mixing patterns of friction stir spot welded (FSSW) joints of dissimilar aluminum alloys were *** aluminum alloys typically used in automotive applications,5052-H32 and 6061-T6,were *** the experiment,the process parameters including the z-axis force and torque histories were measured as a function of the tool *** mechanical properties were investigated by microhardness measurements of the joint,and the material mixing in the stir zone was investigated by *** experimental results illustrate different process parameter histories,material mixing in the stir zone and material properties including microhardness distributions for FSSW joints of dissimilar aluminum alloys,likely due to different mechanical behaviors of the selected aluminum alloys in the FSSW process temperature range.

关键词： friction stir spot welding dissimilar aluminum alloys force histories torque histories microhardness

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The Climate Variabilities of Air Temperature Around the Korean Peninsula

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Advances in Atmospheric Sciences 2005年第4期22卷 575-584页

作者： yong-hoon YOUN Meteorological Research Institute/Korean Meteorological Administration Seoul Korea

In this study, changes in climatological conditions around the KoreanPeninsula are estimated quantitatively using various types of high order statistical analyses. Thetemperature data collected from Incheon station have been analyzed for the assessment of the climatevariation. According to our analysis, the climate changes observed over the Korean Peninsula forthe last century are similar to the global observational data in many respects. First of all, thewarming trend [+1.5℃ (100 yr)^(-1)] and the overall evolving pattern throughout the century axequite similar to each other. The temperature change in the Korean Peninsula is about two to threetimes larger than that of the global scale which may partially be ascribed to the influence ofurbanization at mid and high latitudes. In this work, a new Winter Monsoon Index (WMI) is suggestedbased on the European continental scale circulation index (EU1) pattern. Our WMI is defined as thenormalized sea level pressure (SLP) difference in the winter period between the centers of the EastSea and west of Lake Baikal in Siberia, the two eastern centers of the EU1 action patterns. A strongsimilarity is found between the time series of the WMI and surface air temperature at Incheon. TheWMI has decreased gradually since the 1920s but has shifted to a rapid increasing trend in the lasttwo decades; it was in fact accompanied by a weakening of the Siberian High and a decreasing of thenortherly during winter. Our findings of the close correlations between the surface air temperatureat Incheon and the WMI strongly indicate that our newly suggested index is unique and can be used asan efficient tool to predict climate variability in Korea.

关键词： winter monsoon index climate variability

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