Jongha Lee

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—A novel tactile imaging sensor, that is capable of measuring the elasticity of the touched object, is designed, implemented, and tested. In the proposed sensor, a multi-layer Polydimethylsiloxane optical waveguide has been fabricated as the sensing probe. The light is illuminated at the critical angle to totally reflect within the flexible and transparent(More)
The objective of this study was to examine the associations between symptoms of attention-deficit/hyperactivity disorder (ADHD), depression, and suicide in Korean female adolescents. It was hypothesized that the relationship between ADHD symptoms and suicidal ideation would be mediated by the level of depressive symptoms. Seven hundred and eighty-eight high(More)
OBJECTIVE A community survey was performed to investigate the factors and perspectives associated with happiness among the elderly in Korea (≥60 years). METHODS Eight hundred volunteers selected from participants in the Ansan Geriatric study (AGE study) were enrolled, and 706 completed the survey. The Happiness Questionnaire (HQ), which asks four(More)
Hyperspectral imaging system has been developed to characterize lung tissue for detecting emphysematous tissues in lung volume reduction surgery. The system consists of a charge-coupled device and liquid crystal tunable filter, which is continuously tunable in the near-infrared spectral range of 650 - 1100 nm with a mean bandwidth of 5 nm. Using(More)
The tissue inclusion parameter estimation method is proposed to measure the stiffness as well as geometric parameters. The estimation is performed based on the tactile data obtained at the surface of the tissue using an optical tactile sensation imaging system (TSIS). A forward algorithm is designed to comprehensively predict the tactile data based on the(More)
OBJECTIVE Low-income adults are considered to be a group at high risk for suicide. We sought to examine the effect of type D personality and other socio-demographic factors on suicidality in low-income, middle-aged Koreans. METHODS In total, 306 low-income, middle-aged Koreans [age: 49.16±5.24 (40-59) years, 156 males, 150 females] were enrolled from the(More)
The purpose of the present study was to record the time at which biological phenomena stop in different hospital wards and determine regular patterns in times of death, as well as any factors involved. A comparative analysis was conducted for the morality distribution between the intensive care unit (ICU) and general rooms (GR), according to year, month,(More)
Obstructive sleep apnea syndrome is a sleep-related breathing disorder that is caused by obstruction of the upper airway. This condition may be related with many clinical sequelae such as cardiovascular disease, high blood pressure, stroke, diabetes, and clinical depression. To diagnosis obstructive sleep apnea, in-laboratory full polysomnography is(More)
The tissue inclusion parameter estimation method is proposed to measure the stiffness as well as geometric parameters. The estimation is performed based on the elasticity image obtained at the surface of the tissue using an optical based elasticity imaging sensor. A forward algorithm is designed to comprehensively predict the elasticity image based on the(More)
OBJECTIVE People with attention-deficit/hyperactivity disorder (ADHD) exhibit considerable impairment in social, academic, or occupational functioning. The present study aimed to examine the patterns of associations between ADHD symptoms, depression, and family functioning. METHODS The sample consisted of 1,022 adults randomly selected from a district in(More)