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Yoon, Byoung-Jip Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.8
The anomalies that appear at every multiple of 15 ℃ in the viscosity of a thin liquid film of water and of water near solid interfaces are explained in this paper by comparing the thermal wavelength and molecular free volume of water, and quantum numbers are found. The possibility that these anomalies are related to the preferred and/or lethal temperatures of organisms is considered. The toxicity of heavy water (D₂O) can also be explained with this approach.
Phase Transition and Approximated Integral Equation for Radial Distribution Function
Yoon, Byoung-Jip,Jhon, Mu-Shik Korean Chemical Society 1986 Bulletin of the Korean Chemical Society Vol.7 No.1
A reduced condition for liquid-gas phase transition from the singularity of compressibility is derived using diagrammatic approach and is examined in the hard sphere system. The condition turns out that the Percus-Yevick and the Hyper-Netted-Chain approximation never conceive the idea of phase transition, and explains that the liquid-gas transition does not exist in hard sphere system. The solid-fluid transition is considered on the viewpoint of correlation function and diagrammatic analysis.
Stability of the Pentagon Structure of Water Cluster
Yoon, Byoung-Jip,Jhon, Mu-Shik Korean Chemical Society 1991 Bulletin of the Korean Chemical Society Vol.12 No.1
A hexagonal hexamer of water cluster is optimized by ab initio method using the 4-31G basis set. At this geometry the nonadditive many-body interactions are calculated. The ab initio calculation with large basis set [T. H. Dunning, J. Chem. Phys., 53, 2823 (1970); 54, 3958 (1971)] shows that a pentagonal unit is rather stable among several kinds of clustering units of water molecules.
The Anomalies of Supercooled Water
Yoon, Byoung-Jip,Jhon, Mu-Shik Korean Chemical Society 1984 Bulletin of the Korean Chemical Society Vol.5 No.2
The anomalous behaviors of supercooled water are explained by using a two-solid-like structure model in which an equilibrium is assumed between open structures and closed structures. Besides these structures, small fraction of monomer exists in liquid water. The anomalies of liquid water are classified into two groups: structural and energetic. The structural anomalies appear in enlarged fashions in a supercooled state where the free volume is small.
( Byoung-ki An ),( Su Hyun An ),( Han-seul Jeong ),( Kwan-eung Kim ),( Eun Jip Kim ),( Sang-rak Lee ),( Changsu Kong ) 한국축산학회(구 한국동물자원과학회) 2020 한국축산학회지 Vol.62 No.3
Two experiments were conducted to determine apparent metabolizable energy (AME), nitrogen- corrected AME (AMEn), and ileal digestible amino acid (AA) content of brown rice (BR) and to investigate the effect of dietary supplementation of BR on laying performance and egg quality of laying hens. In Exp. 1, 72 Hy-line Brown layers (49-week-old) were allocated to two treatments using a completely randomized block design, and each treatment included six cages per treatment and six hens per cage. A semi-purified diet was formulated to include BR as the sole source of AA and energy and an N-free diet was used to determine basal endogenous loss of AA. The hens were fed a commercial layer diet for adaptation to the experimental environment and diet for 7 days from d 0, and then fed experimental diets for 5 days from d 7. Excreta were collected from d 10 to 11 and ileal digesta were collected on d 12. On a dry matter (DM) basis, the AME and AMEn of BR was determined at 3,773 and 3,729 kcal/kg, respectively. The apparent ileal digestibility (AID) of BR ranged from 32.7% for Thr to 73.7% for Arg. The range of the standardized ileal digestibility (SID) value was between 79.4% for Met and 96.6% for Lys. In Exp. 2, 252 Hy-line Brown layers (44-week-old) were divided into four groups, comprising seven replicates of nine birds each and assigned to four experimental diets containing 0 (Control), 5%, 10%, or 15% BR for 5 weeks. The BR-containing diets were formulated to be equal in the content of AMEn and digestible AA to those of the diet without BR. No significant differences were observed in laying performances. Egg quality and blood profiles were not linearly or quadratically affected by dietary treatments. These results suggest that up to 15% BR can be included into layer feed without any adverse effects on laying performance and egg quality, if its energy and digestible AA values are well evaluated.
도시지역 청소년층의 체격 , 피하지방후와 기초체력의 상관성에 관한 연구
남병집 한국보건통계학회 1984 한국보건정보통계학회지 Vol.9 No.1
This study measured physical growth and development, skinfold thickness and physical fitness. and the correlation between them of the junior and senior high school students 3152(1688 males and 1464 females) in Seoul during one month from Sept. 1 till Sept. 30, 1982. The results were as follows A. Physical Growth and Development 1) The period of straight growth and development was till the age of 16. 2) Yearly maximum growth, development age and the amount were as follows. Body Height : male 6.7cm between the age 13 and 14. female 3.1cm between the age 15 and 16. Body Weight : male 8.1kg between the age 15 and 16. female 4.9kg between 15 and 16. Chest Girth : male 5.5cm between 15 and 16. female 5.1cm between 15 and 16. Sitting Height : male 4.2cm between 13 and 14. female 1.5cm between 13 and 14. 3) Crossing between male and female was that female excelled male till the age of 13.5 and male excelled female after that age. 4) Individual differences in growth and development in adolescence were remarkable. B. Mean Value of Skinfold Thickness The mean skinfold thickness measured with a large skinfold caliper was: At the subscapular : male 10.48±0.13mm and female 16.01±0.19mm. Abdominal : male 11.89±0.19mm and female 17.62±0.18mm Lumbar : male 12.37±0.19mm and female 17.73±0.22mm Upper arm : male 10.39±0.15mm and female 15.16±0.20mm Total average : male 11.48±0.14mm and female 17.02±0.17mm C. Basic Physical Fitness The reselts of 100m run, Standing long jump. Throwing pitch, Pull-ups or Arms bend hanging, Sit-ups etc. are as shown in Table 4. D. Correlation Coefficient between Body Weight and Physical Fitness The correlation coefficient between body weight and basic physical fitness is an shown in Table 5.