• Korean Journal of Head & Neck Oncology
• /
• v.7 no.1
• /
• pp.10-16
• /
• 1991

Elective neck dissection (END), provide proper information on nodal status and stage which are significant prognosticator in head and neck cancers with clinically $N_{(0)}$ neck. But there are many controversies for the extents, methods of surgery, moreover, whether normal lymph nodes, local defencer, have to be removed or not. The authors performed 47 END in 39 patients of head and neck squamous cell carcinoma from 1984 to 1989 and a retrospective study of the cases was conducted. Eighteen percent of nodal metastasis and five percent of extracapsular spread were found in END specimens. We concluded that END provide significant information for the management and evaluation of prognosis in head and neck cancer.

• The Journal of Korean Medicine
• /
• v.17 no.1 s.31
• /
• pp.433-446
• /
• 1996

From September 1990 to December 1994, author had treated by acupuncture for 75 cases of strained headache. The results were as follows. 1. There were some kind of head-ache, posterior head-ache( 32.0 % ), lateral head-ache( 28 % ), whole head-ache( 25.3 % ), floating head-ache(8.0%), upper head-ache( 4.0 % ), front head-ache( 2.7 % ). 2. The causes of head-ache were indistinctness ( 34.7 % ), sensibility ( 53.3 % ), indigestion( 12.9 % ), ect. 3. The combined symptoms were indigestion, constipation, sensibility, hypertention, muscle-ache, ect. 4. There were effects of acupuncture treatment, unavailability (25.3 %), availability (74.7 %). 5. There were availability in according with increasing treatment.

• ETRI Journal
• /
• v.24 no.2
• /
• pp.176-179
• /
• 2002

Using scaled models for an anatomical head model and a simple head model, we investigated the effects of head size on specific absorption rate characteristics for two mobile phones operating at 835 MHz and 1765 MHz. Our results showed that a larger head produced a higher localized SAR at 835 MHz. However, at 1765 MHz, the differences among the head models were insignificant since the superficial absorption was dominant over the effects of head shape and size. A larger head produced a lower whole-head averaged SAR at both frequencies.

• Journal of the Korean Society of Safety
• /
• v.16 no.2
• /
• pp.13-21
• /
• 2001

The effect of water spray for the fire sprinkler depends on droples distribution over maximum possible floor area. The present study are carried out for the characteristics of water spray and droplets experimentally and numerically km two fire sprinkler heads which are CHM head and CHl heal CHl head is self-production and CHl head is widely used up to date. As the result of using CHM head, water spray and droplets are distributed over large area because CHM head has smooth surface and non-flamed shape. When the pressure of fire sprinkler head is low, SMD(sauter mean diameter) is large and when the pressure of fire sprinkler head is high, SMD is small.

• Journal of the Korean Society of Safety
• /
• v.29 no.1
• /
• pp.25-30
• /
• 2014

This paper deals with a numerical study on the deformation of a mono tendon anchor head. The anchor head is used to introduce the compression to concrete, and consists of wedges and a head. All kinematics, material and contact nonlinearity are included in the precise analysis of a mono tendon anchor head. A numerical study on a mono tendon anchor head is performed to investigate effects of friction and eccentricity of load by ABAQUS. From the numerical results, it is verified that the deformation of a mono tendon anchor head is affected by characteristics of materials, boundary condition between wedge and anchor head, eccentricity of load, etc.

• Korean Journal of Applied Biomechanics
• /
• v.15 no.3
• /
• pp.153-159
• /
• 2005

The purpose of this study was to investigate the Effective X-Factor in golf swing. The term X-Factor means the relative rotation of shoulders with respect to hips during the golf swing. To ascertain the Effective X-Factor that resulted in a high club head speed at impact six golfers' swing motions were videotaped and analyzed using three-dimensional techniques. The results can be summarized as follows. The standard deviations of the professionals' average club head speeds were higher than the amateurs'. This means that the professionals' swing skills were better than amateurs' in driving accuracy and consistency. As the club head speeds were increased gradually the X-Factors and the club head speeds had reached to the subjects' average club head speeds, but the X-Factors and the club head speeds were not increased above the subjects' average club head speeds. The X-Factor Stretch early in the down swing was existed and Professional stretched values were higher than the amateurs. In conclusion my research results suggested that the increase in Effective X-Factors had no relationship to the increase in club head speeds.

• Journal of the Korean Society for Precision Engineering
• /
• v.15 no.9
• /
• pp.50-55
• /
• 1998

A thermal printing head is used for heat transcription printing of facsimile or printer. The thermal printing head has multilayered thin films and heaters lined up. Thermal analysis of thermal printing head is important for a design of thermal printing head. Since the heating charateristics of thermal printing head is dependent on the thermal conductivities of multilayerd material, this study made numerical analysis for three dimensional transient heat conduction in mutilayered films by the finite difference method and investigated the effect of various thermal conductivities of thin films. The results of this study will be used to design thermal printing head and select the materials for thermal printing head.

• Journal of Oral Medicine and Pain
• /
• v.18 no.2
• /
• pp.131-147
• /
• 1993

To evaluate the contribution of head/neck posture to signs/symptoms of craniomandibular disorder(CMD), the author clinically, cephalo-metrically, analyzed craniomandibular index (CMI), clinical dysfunction index(CDI), occlusal index(OI) and head posture, cervical spine, cervicovertebral anatomy, craniofacial variables from 30 CMD patients and control. And the author analyzed difference between patients and control, and the correlation between CMI, CDI and head posture, cervical spine, cervicovertebral anatomy, craniofacial variables in CMD patients and control. The obtained results were as follows : 1. There was very high significant correlation between CMI and CDI(r=0.8969, p<0.01). 2. There was significant difference between patients and control in head/neck posture, head/neck anatomy(p<0.05). 3. There was significant correlation between CMI, CDI and head posture, cervical spine, cervicovertebral anatomy, craniofacial variables(p<0.05). 4. There was more significant correlation between DI and head/neck posture, head/neck anatomy than between PI and head/neck posture, head/neck anatomy in CMD patients(p<0.05)

• Journal of Korean Academy of Nursing
• /
• v.15 no.1
• /
• pp.44-51
• /
• 1985

The purpose of this study was to investigate the role conflict of head nurse； to identify the degree of the role conflict, the sources of the conflict, and the relation between the degree of the conflict and the general characteristics of head nurse. During the period from July 23, 1984 to August 4, 1984, data were collected from 109 head nurses working in 7 general hospitals in seoul. The results of this study were: 1. The degree of the role conflict of head nurse was moderate. But among the three areas in performing head nurse's role, the degree of role conflict as a operational manager was slightly serious. 2. In the various sources of the role conflict of head nurse, the main sources were the shoratage of personnel (20.7%), lack of equipment (19.3%), and lack of time. (17.6%). 3. In comparison of the degree of role conflict of head nurse, there is no significant difference in the general characteristics of head nurse. But the role conflict of head nurse as a operational manager, there is a significant difference in hospital types in which the head nurse were working. (p <0.01). And as a operational manager, there is a significant difference of role conflict in educational levels. (p <0.01).

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2007.11a
• /
• pp.1009-1013
• /
• 2007

To do a HRTF customization, researchers used a spherical head model for modeling the head block of structural modeling of HRTF, which is the one of the technique for HRTF customization, because of its simplicity. In this paper, an analytic spheroidal HRTF caused by an incident point source will be introduced. Using proposed spheroidal HRTF, near-field HRTF customization can be applicable through a structural modeling of HRTF. To see the necessity of sheroidal head model, comparison of two analytic solutions, which are classical spherical HRTF and proposed spheroidal HRTF, will be shown. On the view point of ITD, optimal head model which matches with the measured ITD of KEMAR HRTF can be obtained. ITD results show that there are only slight differences between spherical and spheroidal head model. Magnitude comparison is made by constructing head model using measured head size. Although magnitude comparison is not studied between optimal models, the results of 24 of 36 subjects are shown that spheroidal head model matches notch frequency pattern of measured HRTF better than those of spherical one, where the sound source is at contralateral position.