유기산의 해리평형에 미치는 치환기 효과와 그의 온도 및 압력의 영향 : (4)수용액중에서 몇가지 이메틸피리딘의 해리상수 (4) Dissociation Constants of some Dimethylpyridines in Aqueous Solution

황정의,정재원,장경희 慶北大學校 自然科學大學 1987 自然科學論文集 Vol.5 No.-

The dissociation constants of 2, 3-, 2, 4-, 2, 5-and 3, 5-dimethylpyridine were measured by conductometric method at various temperatures (15∼40℃) and pressures (1∼2500 bar) in aqueous solution. The shift of dissociation constants of methylptridines from pyridine were explained by the I-effect and cooperative effect of the methyl groups. From the dissociation constants various thermodynamic properties were calculated and discussed the characteristics of the dissociation reactions.

수용액중에서 아세틸피리딘류의 해리에 미치는 온도와 압력의 영향

黃正儀,鄭在元,鄭載植 慶北大學校 1990 論文集 Vol.49 No.-

The dissociation constants of 2-, 3- and 4-acetylpyridine were measured by conductometric method in the temperature range from 15 to 40℃ and pressure up to 2,500bar. The dissociation constants of these substituted pyridines were increased as the temperature increase but decrease as the pressure. From the data thermodynamic properties were calculated and the Hammett plat were obtained. From these properties the characteristic properties of the dissociation reaction were discussed.

유기산의 해리평형에 미치는 치환기 효과와 그의 온도 및 압력의 영향. : (2) 수용액중에서 몇가지 치환나프톨류의 해리상수 (2) Dissociation Constants of Some Substituted Naphthols in Aqueous Solution

黃正儀,裵俊雄,鄭倧在,鄭在元,張景喜 慶北大學校 物理化學硏究所 1986 硏究論文集 Vol.7 No.-

치환나프톨류(4-Cl-1-Naphthol, 6-Br-2-Naphthol, 8-NH_2-2-Naphthol)의 해리상수를 온도(25∼40℃)와 압력(1∼2000 bar)을 변화시키면서 분광학적 방법으로 측정했다. 이들의 해리상수는 치환기가 들어가므로서 모두 감소했다. 이것은 치환기의 I-효과로서 설명이 가능했으며 또 온도와 압력이 증가하면 해리상수도 증가하였다. 이들 해리상수로부터 반응의 열역학적 성질을 계산하여 반응의 성질을 알아보았다. The dissociation constants of 4-Cl-1-naphthol, 6-Br-2-naphthol, 8-NH_2-2-naphthol in aqueous solution were measured by spectroscopic method in the temperature range from 25 to 40℃ and pressure up to 2000bar. The dissociation constants were decreased as the substituents were inserted in naphthol from 4.4×10 exp(-10) to 5.82×10 exp(-11) as chloride compound and 2.5×10 exp(-10) to 3.44×10 exp(-11) or 4.21×10 exp(-11) as bromine or amino compounds, respectively. This decrease can be explained with the I- or R-effects of substituents. From the dissociation constants various thermodynamic properties were claculated and discussed the characteristics of the dissociation reaction.

Is There an Association between the Quality of Life of Incontinence Symptoms and the Hip Joint Muscles Strength in Women with Stress Urinary Incontinence?

Ui-jae Hwang(Ui-jae Hwang) KEMA학회 2022 근골격계과학기술학회 Vol.6 No.1

Background For establishing an accurate target for rehabilitation of stress urinary incontinence (SUI), it is necessary to determine whether there is an association between the pelvic floor muscle (PFM) and hip joint muscle strength and quality of life (QoL) of incontinence symptoms. Purpose The purpose of the current study was to confirm the correlation between QoL of incontinence symptoms and PFM strength, hip extensor, abductor, and adductor strength in women with SUI. Study design Cross sectional study Methods Forty-two women with SUI were recruited for the present study. PFM performance was measured by perineometry. Hip extensor, abductor and adductor strength were measured by dynamometry. QoL of incontinence symptoms was measured by incontinence quality of life questionnaire (I-QOL). The significance of the correlations between I-QOL and hip joint muscle and PFM strength was assessed using Pearson correlation coefficients. Alpha value was set at 0.05. Results Avoidance and limiting behaviors factor in I-QOL was correlated with PFM strength (r=0.524, p<0.05), hip adductor strength (r=0.356, p<0.05) and hip abductor strength (r=0.352, p<0.05) in the order. The total score in I-QOL was correlated with PFM strength (r=0.368, p<0.05). Conclusions When designing which muscles to train for improving QoL of incontinence symptoms, the hip joint muscle as well as the PFM could be considered.

Comparison of Buttock Pressure and Pelvic Tilting Angle During Typing in Subjects With and Without Unilateral Low Back Pain

Ui-jae Hwang,Si-hyun Kim,Houng-sik Choi,Oh-yun Kwon 한국전문물리치료학회 2014 한국전문물리치료학회지 Vol.21 No.1

Asymmetric sitting posture may cause asymmetric buttock pressure and unilateral low back pain (LBP). The purpose of this study was to compare the differences of buttock pressure between both sides, and pelvic angle (sagittal and coronal planes) during typing in a sitting position on a pressure mat (Baltube) in individuals with and without unilateral LBP. Ten subjects with unilateral LBP and ten subjects without unilateral LBP were recruited for this study. Buttock pressure was measured using a pressure mat and pelvic angles were measured using a palpation meter. The subjects performed typing in a sitting posture for 30 minutes. Pressure data were collected and averaged at initial term (from start to first minutes) and final term (last minutes of 30 minutes). Angles of pelvic tilting were measured after 30 minutes typing. Pressure asymmetry values (difference in pressure between both sides) were calculated at the initial and final terms. A two-way analysis of variance was used to compare the differences between the initial and final pressure asymmetry values in subjects with and without unilateral LBP. An independent t-test was applied to compare the pelvic tilt angles between the two groups. To compare the change of pressure from the initial term to the final term between the symptomatic and asymptomatic sides in the unilateral LBP group, a paired t-test was applied. In the unilateral LBP group, the pressure asymmetric value at the final term was significantly greater than that of the initial term (p<.05). The angle of pelvic tilting in coronal plane was significantly greater in the unilateral back pain group compared to the without unilateral LBP group (p<.05), however, there was no significant difference in the angle of pelvic tilting in the sagittal plane between the two groups (p>.05). In the unilateral LBP group, the change of pressure from the initial term to the final term was significantly less in the symptomatic side (-6.90 ㎜Hg) than the asymptomatic side (5.10 ㎜Hg). This asymmetric sitting posture may contribute to unilateral LBP in the sitting position. Further studies are needed to determine if asymmetric weight bearing in sitting causes unilateral LBP or if unilateral back pain causes asymmetric weight bearing, and if the correction of asymmetric weight bearing in sitting can reduce unilateral LBP.

Kinetics for the Reaction of Phenacyl Bromide with Pyridine in Acetone under High Pressure

Hwang, Jung-ui,Chung, Jong-Jae,Yoh, Soo-Dong,Jae, Jong-Gi 慶北大學校 物理化學硏究所 1984 硏究論文集 Vol.5 No.-

Kinetic studies for the reaction of phenacyl bromide with pyridine in acetone were carried out by the electric conductance method under temperature range from 25℃ to 40℃ and pressure range from 1 bar to 2500 bars. The rate of the reaction increases with increasing pressure and temperature. The activation enthalpy (ΔH^≠), activation entropy (ΔS^≠) and activation volume (ΔV^≠) for the reaction were calculated. It was shown that the linear relationship between the ΔH^≠ and ΔS^≠ for the pressure change exist in the reaction. This result in that the so-called isokinetic temperature is shown as 261 K in the experimental pressure range. From the thermodynamic quantities it is estimated that the reaction preceeds on the mechanism of S_N2 type as the general Menschutkin reaction shows.

Effect of applying consistent pressure to the stationary and the moving arm on measurement reliability of glenohumeral internal rotation range of motion

Hwang, Ui-jae,Kwon, Oh-yun,Jeon, In-cheol,Jung, Sung-hoon,Kim, Moon-hwan Informa UK (TaylorFrancis) 2019 Physiotherapy theory and practice Vol.35 No.6

Reliability Study of Measuring Range of Motion Glenohumeral Joint Internal Rotation With Pressure Biofeedback Stabilization

Ui jae Hwang,Sung min Ha,In chul Jeon,Sung hoon Jung,Kyu hwan Choi,Su jung Kim,Oh yun Kwon 한국전문물리치료학회 2015 한국전문물리치료학회지 Vol.22 No.4

The aims of the current study were to assess reliability of range of motion (ROM) measurement of glenohumeral internal rotation (GIR) with a pressure biofeedback stabilization (PBS) method and to compare the reliability between manual stabilization (MS) and the PBS method. In measurement of pure glenohumeral joint motion, scapular stabilization is necessary. The MS method in GIR ROM measurement was used to restrict scapular motion by pressing the palm of the tester’s hand over the subject’s clavicle, coracoid process, and humeral head. The PBS method was devised to maintain consistent pressure for scapular stabilization during GIR ROM measurement by using a pressure biofeedback unit. GIR ROM was measured by 2 different stabilization methods in 32 subjects with GIR deficit using a smartphone clinometer application. Repeated measurements were performed in two test sessions by two testers to confirm inter- and intra-rater reliability. After tester A performed measurements in test session 1, tester B’s measurements were conducted one hour later on the same day to assess the inter-rater reliability and then tester A performed again measurements in test session 2 for confirming the intra-rater reliability. Intra-class correlation coefficient (ICC) (2,1) was applied to assess the inter-rater reliability and ICC (3,1) was applied to determine the intra-rater reliability of the two methods. In the PBS method, the intra-rater reliability was excellent (ICC=.91) and the inter-rater reliability was good (ICC=.84). The inter-rater and intra-rater reliability of the PBS method was higher than in the MS method. The PBS method could regulate manual scapular stabilization pressure in inter- and intra-rater measuring GIR ROM. Results of the current study recommend that the PBS method can provide reliable measurement data on GIR ROM.

Predictors of upper trapezius pain with myofascial trigger points in food service workers : The STROBE study

Hwang, Ui-Jae,Kwon, Oh-Yun,Yi, Chung-Hwi,Jeon, Hye-Seon,Weon, Jong-Hyuck,Ha, Sung-Min Wolters Kluwer Health 2017 Medicine Vol.96 No.26

<P><B>Abstract</B></P><P>Shoulder pain occurs commonly in food service workers (FSWs) who repetitively perform motions of the upper limbs. Myofascial trigger points (MTrPs) on the upper trapezius (UT) are among the most common musculoskeletal shoulder pain syndromes. This study determined the psychological, posture, mobility, and strength factors associated with pain severity in FSWs with UT pain due to MTrPs.</P><P>In this cross-sectional study, we measured 17 variables in 163 FSWs with UT pain due to MTrPs: a visual analog scale (VAS) pain score, age, sex, Borg rating of perceived exertion (BRPE) scale, beck depression inventory, forward head posture angle, rounded shoulder angle (RSA), shoulder slope angle, scapular downward rotation ratio, cervical lateral-bending side difference angle, cervical rotation side difference angle, glenohumeral internal rotation angle, shoulder horizontal adduction angle, serratus anterior (SA) strength, lower trapezius (LT) strength, bicep strength, and glenohumeral external rotator strength, in 163 FSWs with UT pain due to MTrPs.</P><P>The model for factors influencing UT pain with MTrPs included SA strength, age, BRPE, LT strength, and RSA as predictor variables that accounted for 68.7% of the variance in VAS (<I>P</I> < .001) in multiple regression models with a stepwise selection procedure. The following were independent variables influencing the VAS in the order of standardized coefficients: SA strength (β = −0.380), age (β = 0.287), BRPE (β = 0.239), LT strength (β = −0.195), and RSA (β = 0.125).</P><P>SA strength, age, BRPE, LT strength, and RSA variables should be considered when evaluating and intervening in UT pain with MTrPs in FSWs.</P>

Effects of surface electrical stimulation during sitting on pelvic floor muscle function and sexual function in women with stress urinary incontinence

( Ui-jae Hwang ),( Oh-yun Kwon ),( Min-seok Lee ) 대한산부인과학회 2020 Obstetrics & Gynecology Science Vol.63 No.3

Objective Dysfunction of the pelvic floor muscles (PFM) is associated with sexual dysfunction in women with stress urinary incontinence (SUI). The EasyK7 device was developed to stimulate the PFM by surface electrical stimulation during sitting (SESdS). We investigated the effects of SESdS on PFM function and sexual function in women with SUI. Methods Women with SUI were randomized into the SESdS and control groups. PFM function and sexual function were assessed using a perineometer and the pelvic organ prolapse-urinary incontinence sexual function questionnaire (PISQ), respectively. After 8 weeks, the groups were compared using either analysis of covariance with the baseline values as covariates or the paired Student’s t-test. Results The final analysis included 16 subjects from each group. There were significant differences between the SESdS and control groups after the intervention, as well as within the SESdS group between the pre- and post-intervention measurements. The P-values for the differences in PFM measurements between the groups, and between the preand post- intervention measurements within the SESdS group, were 0.001 and 0.004 for power, 0.015 and 0.011 for strength, and 0.012 and 0.034 for endurance, respectively. In addition, in the PISQ, there were significant differences between the groups and between the pre- and post-intervention measurements within the SESdS group in the partner-related domain (between groups: P=0.003; within SESdS group: P=0.024) and total score (between groups: P<0.001; within SESdS group: P=0.001). Conclusion SESdS can improve PFM function and sexual function in women with SUI.