PubMed Health⌕ Search

Biomedical subjects

H Won

Publications and source records attributed to H Won.

14 recordsLinked to original sources
PubMed2002

A study of methods to reduce groundwater contamination around the Kimpo landfill in Korea.

Four different methods were studied to reduce the groundwater contamination around the Kimpo landfill in Korea by leakage of a leachate. The hydraulic parameters were measured for this study and then the groundwater flow and contaminant transport systems around the Kimpo landfill were simulated with MODFLOW and MT3D models. Both the method of establishing 5 sets of Radial Collector Well Laterals (RCWLs) within the landfill and a method utilizing the wells for dewatering condensed water brought about a 70% leachate elimination efficiency. Their construction costs were cheap, and the maximum concentrations of chloride and phenol in the leachate effluent were high. Meanwhile, a method establishing an interception wall to the 2nd layer at the cirumference of the landfill and 22 sets of RCWLs within it brought about a 92% leachate elimination efficiency. Its construction cost was expensive, and the maximum concentrations of chloride and phenol in the leachate effluent were low. A method of establishing an interception wall to the 3rd layer and 40 sets of RCWLs brought about a 97% leachate elimination efficiency. Its construction cost was the most expensive, and the maximum concentrations of chloride and phenol were low. Conclusively, a method of establishing 22 sets of RCWLs was evaluated as the most stable and economical option to reduce groundwater contamination concentration below drinking water standard.

Cost-Benefit Analysis↗
PubMed1997

Students' stress in China, Japan and Korea: a transcultural study.

In this transcultural comparison of stress among Chinese, Japanese and Korean students, the authors examined stressors with the Stress Questionnaire Form for College Students, strategies for coping with Ways of Coping-Revised, and physical reactions to the stressors with the Physical Symptom Scale of Stress. Compared to the Japanese and Korean students, Chinese students had a multitude of stressors and experienced the highest level of stress. In coping with stressful events, Koreans were the most active, Chinese the least active and Japanese were intermediately active. Physical symptoms were found to be most serious in Koreans and less serious in Chinese and Japanese. Coping techniques seemed unrelated to alleviating physical symptoms in Koreans but mildly related in Chinese and Japanese.

Adaptation, Psychological↗
PubMed1981

Driving and perceptual/cognitive skills: behavioral consequences of brain damage.

This study investigated the effects of brain damage on perceptual/cognitive skills and driving. The subjects included 23 persons with brain damage, 18 persons with spinal-cord damage, and 10 able-bodied persons. Each subject was evaluated using a battery of perceptual and cognitive tests, a set of driving tasks in a parking lot, and actual in-traffic driving over a fixed route. The results indicate that (1) while persons with brain damage, as a group, exhibited impaired perceptual/cognitive skills and also impaired driving, those who scored well on certain perceptual/cognitive tests tended to show good driving performance as well, (2) different perceptual/cognitive tests are good predictors of driving performance by persons with and without brain damage, and (3) the driving problems exhibited by some of the persons with brain damage likely result, in part, from the deficits in their perceptual and cognitive skills.

Adult↗
PubMed1976

Cluster analysis applied to symptom ratings of psychiatric patients: an evaluation of its predictive ability.

Rating on 39 symptoms were examined for patients admitted to the Neuropsychiatric Institute of the University of Michigan Medical Center. A detailed evaluation was made of the clusters derived by a hierarchical clustering algorithm, using complete linkage and a simple matching coefficient on the binary variables of presence or absence of symptoms. The four groups of patients suggested by the cluster analysis can be characterized as follows: (1) generalized multiplicity of symptoms; (2) capacity to cope except for orientation apart from generally held norms; (3) activity level and thought processes speeded up, intensified, and unselected; (4) inwardly punitive, slowed down and distressed. It is shown that these groups received significantly different treatment and that the effect of treatment was significantly different, while no such differences were noted for groups defined in terms of diagnoses. By means of linear discriminant functions, rules are suggested for assigning other psychiatric patients to one of these four groups.

Antipsychotic Agents↗
PubMedDate not supplied

Repeated evolution of dioecy from monoecy in Siparunaceae (Laurales).

Siparunaceae comprise Glossocalyx with one species in West Africa and Siparuna with 65 species in the neotropics; all have unisexual flowers, and 15 species are monoecious, 50 dioecious. Parsimony and maximum likelihood analyses of combined nuclear ribosomal ITS and chloroplast trnL-trnF intergenic spacer sequences yielded almost identical topologies, which were used to trace the evolution of the two sexual systems. The African species, which is dioecious, was sister to all neotropical species, and the monoecious species formed a grade basal to a large dioecious Andean clade. Dioecy evolved a second time within the monoecious grade. Geographical mapping of 6,496 herbarium collections from all species sorted by sexual system showed that monoecy is confined to low-lying areas (altitude < 700 m) in the Amazon basin and southern Central America. The only morphological trait with a strong phylogenetic signal is leaf margin shape (entire or toothed), although this character also correlates with altitude, probably reflecting selection on leaf shapes by temperature and rainfall regimes. The data do not reject the molecular clock, and branch lengths suggest that the shift to dioecy in the lowlands occurred many million years after the shift to dioecy in the ancestor of the Andean clade.

Base Composition↗