Hyeihn Kim

Korea University | KU · Department of Sociology

Background: Malignant central airway obstruction (MCAO) occurs in 20-30% of patients with primary pulmonary malignancy. Although bronchoscopic intervention is widely performed to treat MCAO, little data exist on the prognosis of interventional bronchoscopy. Therefore, we evaluated the clinical outcomes and prognostic factors of bronchoscopic inter...

Tracheobronchopathia osteochondroplastica (TPO) is an idiopathic disease involving the cartilage rings of the large airway, characterized by submucosal calcified nodules. Localized tracheobronchial amyloidosis (TBA) is another rare disease with localized amyloid deposits in the tracheobronchial tree. The two diseases rarely coincide, and only a few...

Objectives Primary pulmonary salivary gland-type tumors (PSGT) are rare among all types of lung cancer. The purpose of this study was not only to evaluate the clinical outcomes and prognostic factors after treatment, but also to assess the role for bronchoscopic intervention in PSGT. Methods We analyzed the medical data of 181 PSGT patients who we...

There has been limited evidence for the association between chronic obstructive pulmonary disease (COPD) and the incidence of lung cancer among never smokers. We aimed to estimate the risk of lung cancer incidence in never smokers with COPD, and to compare it with the risk associated with smoking. This cohort study involved 338 548 subjects, 40 to...

Introduction The maximum standardized uptake value (SUVmax) in ¹⁸F-fluorodeoxyglucose positron emission tomography/computed tomography (PET/CT) may be of prognostic significance for patients with malignant pleural mesothelioma (MPM). This retrospective study aimed to investigate the prognostic value of the SUVmax in patients with MPM. Materials an...

Malignant pulmonary granular cell tumor (GCT) is extremely rare and difficult to distinguish from benign GCT. Most GCTs are neural-type and express S-100. However, a small subset of tumors sub-classified as the non-neural type do not express S-100. We report a case of malignant non-neural-type GCT in the lungs. A 77-year-old woman felt chest discom...

Background Endosonography with needle aspiration (EBUS/EUS-NA) is recommended as the first choice for mediastinal nodal assessment in non-small cell lung cancer (NSCLC). It is important to maintain adequate negative predictive value of the procedure to avoid unnecessary additional surgical staging, but there are few studies on the influence of oper...

Objectives: Recent practice guidelines recommend endosonography for patients with radiological N0 non-small cell lung cancer (NSCLC) when the primary tumors are >3 cm in diameter or centrally located. However, any role for endosonography remains debatable. We evaluated the utility of endosonography in patients with radiological N0 NSCLC based on t...

Bronchopleural fistula (BPF) is a communication between the pleural space and the bronchial tree. Herein, we report a patient with persistent air leak after necrotizing pneumonia, where tract of BPF was not apparent in computed tomography (CT). Despite control of infection, watchful observation, repetitive procedures, and surgery, air leak was not...

Objective: The purpose of this study was to evaluate the diagnostic performance of ¹⁸F-fluorodeoxyglucose positron emission tomography/computed tomography (¹⁸F-FDG PET/CT) for chronic empyema-associated malignancy (CEAM). Materials and methods: We retrospectively reviewed the ¹⁸F-FDG PET/CT images of 33 patients with chronic empyema, and analyze...

Background: Radial probe endobronchial ultrasound (R-EBUS), is effective for tissue diagnosis of lung lesions. We evaluated the diagnostic performance of R-EBUS both a guide-sheath and fluoroscopy and identified factors associated with accurate diagnosis. The feasibility of molecular and genetic testing, using specimens obtained by R-EBUS, was als...

Background: We evaluated the role played by surgery in the diagnosis and treatment of pulmonary cryptococcosis (PC) in immunocompetent subjects. Methods: We retrospectively studied 53 immunocompetent patients who were pathologically diagnosed with PC between January 2000 and December 2016 in a tertiary referral center. We compared the radiologic...

Following publication of the original

Background: Surgical resection is the cornerstone treatment for pulmonary mucormycosis, a lethal fungal infection. It is unclear why some patients do not receive surgery, and the natural courses of these patients have not been well evaluated. Methods: A retrospective review was performed using the medical records of 20 patients with pathologically...

Background: There are few reports comparing flexible and rigid bronchoscopy in adult foreign body (FB) aspiration. The aim of this retrospective study was to review the clinical characteristics, outcomes and factors associated with success in adult patients who underwent flexible or rigid bronchoscopy for airway FB removal. Methods: We retrospec...

Background and objective We evaluated the usefulness of acid‐fast bacilli (AFB) culture and Mycobacterium tuberculosis (MTB) polymerase chain reaction (PCR) of endobronchial ultrasound‐guided transbronchial needle aspiration (EBUS‐TBNA) needle rinse fluid for diagnosing tuberculous lymphadenitis. Methods EBUS‐TBNA needle rinse fluid was routinely...

Background Guidelines recommend invasive mediastinal staging for centrally located tumours, even in radiological N0 nonsmall cell lung cancer (NSCLC). However, there is no uniform definition of a central tumour that is more predictive of occult mediastinal metastasis. Methods A total of 1337 consecutive patients with radiological N0 disease underw...

Background The objective of this study was to discover DNA methylation biomarkers for detecting non-small lung cancer (NSCLC) in bronchial washings and understanding the association between DNA methylation and smoking cessation. Methods DNA methylation was analyzed in bronchial washing samples from 70 NSCLCs and 53 hospital-based controls using Il...

Objective: Patients with lung adenocarcinoma (ADC) are at higher risk of the development of brain metastasis (BM), and genetic alterations are associated with BM. Patients and methods: A total of 598 patients with lung ADC in our institution between January 2014 and December 2014 were reviewed retrospectively. We evaluated the incidence of BM by...

Unilateral pulmonary artery agenesis (UPAA) is a rare congenital anomaly which can be symptomatic or even asymptomatic. Most of patients with isolated UPAA have mild symptoms and it is difficult to be diagnosed, especially when abnormal findings of chest radiograph are the first presentation. It is often misdiagnosed and is not considered during di...

Thoracolithiasis is a rare benign condition with mobile free bodies in the pleural cavity. It is asymptomatic and mostly found incidentally. Up to our knowledge there is no report of symptomatic numerous thoracolithiasis. We report a very rare case of thoracolithiasis in a 36-year-old female with chest discomfort. Images from computed tomography pr...

Background Endobronchial ultrasound‐guided transbronchial needle aspiration (EBUS‐TBNA) may be necessary for patients with incidental lung cancer during or after coronary intervention. Although EBUS‐TBNA is quite safe, the safety in patients who recently received percutaneous coronary intervention (PCI) has not been demonstrated. The aim of this st...

Objective Four commonly used clinical models for predicting the probability of malignancy in pulmonary nodules were compared. While three of the models (Mayo Clinic, Veterans Association [VA], and Brock University) are based on clinical and computed tomography (CT) characteristics, one model (Herder) additionally includes the ¹⁸F-fluorodeoxyglucose...

Background: It has not been determined if adjuvant chemotherapy would be helpful for completely resected early-stage lung adenocarcinoma even with unfavorable genetic markers. As the positive anaplastic lymphoma kinase (ALK) rearrangement is associated with aggressive clinical feature in lung adenocarcinoma, we evaluated the treatment outcomes of...

Background This study was aimed at understanding whether bronchial biopsy specimen can be used as a surrogate for DNA methylation analysis in surgically resected lung cancer. Methods A genome-wide methylation was analyzed in 42 surgically resected tumor tissues, 136 bronchial washing, 12 sputum, and 8 bronchial biopsy specimens using the Infinium...

A wearable electrical impedance tomography (EIT) system is proposed for the portable real-time 3-D lung ventilation monitoring. It consists of two types of SoCs, active electrode (AE)-SoC and Hub-SoC, mounted on wearable belts. The 48-channel AE-SoCs are integrated on flexible printed circuit board belt, and Hub-SoC is integrated in the hub module...

Background: A ground-glass nodule (GGN) represents early-stage lung adenocarcinoma. However, there is still no consensus for preoperative staging of GGNs. Therefore, we evaluated the need for the routine use of positron emission tomography/computed tomography (PET)/computed tomography (CT) scans and brain magnetic resonance imaging (MRI) during st...

The effect of the clinical phenotype of Mycobacterium avium complex (MAC) lung disease on treatment outcome and redevelopment of nontuberculous mycobacterial (NTM) lung disease after treatment completion has not been studied systematically.We evaluated 481 treatment-naïve patients with MAC lung disease who underwent antibiotic treatment for ≥12 mon...

Objectives The relationship between transthoracic needle biopsy (TTNB) and pleural recurrence of cancer after curative lung resection remains unclear. We aimed to assess whether TTNB increases the ipsilateral pleural recurrence (IPR) rate and identify other potential risk factors for pleural recurrence after surgery. Materials and methods This ret...

Water-running robots have been developed inspired by a basilisk lizard, which demonstrates highly agile, stable and energy efficient locomotion on water surfaces. Current water-running robots are not as stable and agile as their biological counterparts. This study shows how the stability of a water-running robot in the pitch direction can be improv...

A sticker-type system with hybrid integration of CMOS IC and organic optical sensors is proposed to monitor photoplethysmogram (PPG) signals. To solve problems with the previous solely organic sensor-based works, CMOS IC is implemented in 180 nm technology under 5 V/1.5 V dual power supply. The silver-wire printed planar-fashionable circuit board (...

Steering is important for the high maneuverability of mobile robots. Many studies have been performed to improve the maneuverability using a tail. The aim of this research was to verify the performance of a water-running robot steering on water using a tail. Kinematic analysis was performed for the leg mechanism and the interaction forces between t...

Pulmonary actinomycosis frequently mimics lung malignancy on radiologic imaging studies. Positron emission tomography‑computed tomography (PET‑CT) is a useful diagnostic modality for differentiating lung malignancy from benign diseases. However, few studies evaluated PET‑CT findings of pulmonary actinomycosis. Therefore, it is unclear whether PET‑C...

Robotics is one area of research in which bio-inspiration is an effective way to design a system by investigating the working principles of nature. Recently, tails have received interest in robotics to increase stability and maneuverability. In this study, we investigated the effectiveness of a static tail for bio-inspired water-running locomotion....

Tumor heterogeneity influences the clinical outcome of cancer patients, and the diagnostic method to measure the tumor heterogeneity needs to be developed. We analyzed genomic features on pairs of primary and multiple metastatic lymph nodes from six lung cancer patients using whole exome sequencing and RNA-seq. Although somatic single nucleotide va...

Climbing robots are being developed to clean, paint, or inspect high areas that are hard to reach for human beings. To widen their application area, robotic platforms have been suggested using bio-inspired attachment methods, such as dry and wet adhesion for smooth and rough surfaces. Generally, robots can climb either walls or poles, but there has...

Bio-inspired water-running robots are widely researched for fast and energy-efficient locomotion on water surfaces. The leg mechanism is very important for achieving fast and stable cyclic motion locomotion of the footpads. In this paper, four-bar, Klann, and Watt-I leg mechanisms are compared for water-running robotic platforms. Each mechanism was...

BACKGROUND: Tomato and tomato products provide various antioxidant activities, which could be changed by the processing method. This study was performed to evaluate the antioxidant activity of water-soluble tomato powder (WSTP) as affected by different oven temperatures (60, 80 and 100 ∘ C), and to evaluate the physico-chemical properties and antio...

Single Photon Emission Computed Tomography(SPECT) is a widely used diagnosis modality for detecting metabolic diseases. In general, SPECT system is consisted of a sensor, a pre-amplifier, position decoding circuits(PDC) and a data acquisition(DAQ) system. Due to such complexity, it is quite costly to assemble SPECT system by putting discrete compon...

A low-energy 40MHz / 160MHz dual band full duplex body channel communication (BCC) transceiver and 13.56MHz R-C oscillator-based super-regenerative receiver are integrated in 65nm mixed mode CMOS process for both highspeed (HS) and low-speed (LS) biomedical applications. The body channel bandwidth is extended up to 200MHz, enabling energy efficient...

The multimodal stress monitoring headband is proposed for mobile stress management system. It is composed of headband and earplugs. Electroencephalography (EEG), hemoencephalography (HEG) and heart-rate variability (HRV) can be achieved simultaneously in the proposed system for user status estimation. With canonical correlation analysis (CCA) and t...

Kim, Haeun, Sungjin Koo, and Jungok Bae. 2015. Positive, negative, and nil effects of connectives in written stories: Analysis by proficiency groups. Linguistic Research 32 (Special Edition), 105-124. Inconsistent findings about the significance of connectives in prior studies may be due to the fact that connectives were not analyzed according to...

The main advantages of a high-temperature superconducting (HTS) generator over a normal-conducting power generator are its lightweight nature and compact size owing to the significantly improved magnetic loading of the magnetic field coil [1]-[3]. However, there remain many hurdles to overcome before the commercialization of superconducting generat...

High temperature superconductor (HTS) technology, which can provide a large electromotive force in a small area due to its larger current density than a normal conductor, can reduce the weight and loss of a generator, relative to a conventional machine. Moreover, once the HTS conductor has stabilized, the challenge of cooling the windings in large-...

Heterogeneous networks where low power nodes (e.g., femtocells) are employed in addition to existing macrocells have been proposed to cope with increasing data traffic. On the other hand, additionally installed femtocells incur interference against existing macrocells. The interference is particularly severe when the frequency band is shared by bot...

Diesel burners have been used to regenerate diesel particulate filters (DPF) because of their simplicity in engine torque control and less oil dilution by fuel compared with the commonly used in-cylinder post fuel injection method. We previously developed a novel diesel burner using rotating plasma as an ignition source and found it to be effective...

Recently, wearable mental health management systems have been actively studied based on EEG monitoring and transcranial electrical stimulation (tES) [1]. It was reported that mental activities cause neural, vascular and autonomie domain changes in the human brain [2]. However, the previous neurofeedback system [1] used only neural domain informatio...

Recently, smart phones or head-mounted displays enables high definition (HD) video streaming and image data to be shared with friends while wearable smart sensors continuously monitor and send user's physiological information to a smart watch. Body channel communication (BCC), which uses the human body as the communication channel [1], has demonstr...