• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.20 no.2
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• pp.15-20
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• 2014

Objective: The purpose of this study was to investigate the effects of sling exercise on the cervical lordotic angle, craniovertebral angle, and head rotation angle among adolescents in the forward head posture. Methods: The subjects include 22 adolescents that recorded a mild level or higher on the posture evaluation index by New York State. They were randomly divided to the hand exercise group (n=11) and the control group (n=11). The former group participated in the sling exercise program three times a week over four weeks in total with each session lasting 60 minutes, whereas the latter group was not included in the program. The cervical lordotic angle, craniovertebral angle, and head rotation angle were measured before and after the intervention. Results: The study compared the cervical lordotic angle between the two groups before and after sling exercise and found that the sling exercise group made an increase of $7.36^{\circ}$ from $21.91^{\circ}$ to $29.27^{\circ}$ after the intervention(p<.05). As for the comparison results of the craniovertebral angle, the sling exercise group made an increase of $5.64^{\circ}$ from $48.91^{\circ}$ to $54.55^{\circ}$ after the intervention (p<.05). As for the comparison results of the cranial-rotation angle, the sling exercise group made an decrease of $-7.73^{\circ}$ from $148.82^{\circ}$ to $141.09^{\circ}$ after the intervention (p<.05). The control group showed no differences before and after the intervention (p>.05). Conclusion: Those findings indicate that the application of sling exercise in the forward head posture can be a good program to maintain the right posture and improve or prevent an abnormal posture and raise a need for more clinical applications and ongoing researches.

• Journal of The Korean Society of Agricultural Engineers
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• v.53 no.2
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• pp.53-60
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• 2011

This study was conducted to investigate the effect of hydropower factors (watershed, gross head), operation ratio and unit electricity cost on the benefit-cost ratio (B/C ratio) of small hydropower using agricultural reservoirs. The equation of B/C ratio was expressed as a function of watershed area, gross head, operation ratio and unit electricity cost. The benefit increased with watershed area, gross head and unit electricity cost, while the cost increased with watershed area and gross head but decreased with operation ratio. The B/C ratio increased with watershed area, gross head, operation ratio and unit electricity cost. While the effect of gross head on the B/C ratio decreased with watershed area, the effect of operation ratio and unit electricity cost on the B/C ratio increased with watershed area. The operation ratio is an important factor to affect the B/C ratio and therefore we need to develop hydropower for the heightened dams to expect high operation ratio due to continuous water release. The unit electricity cost is also an important factor to affect the B/C ratio and the B/C ratio was always below 1 unless unit electricity cost is over 60 Won/kWh under given conditions. The reservoirs with economic feasibility for small hydropower development were three in 21 when the equation of B/C ratio was appled to the study reservoirs. The results can be used to choose the appropriate reservoir with economic feasibility for development of small hydropower.

• Journal of the Korean Society of Physical Medicine
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• v.13 no.2
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• pp.89-95
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• 2018

PURPOSE: We aimed to study the effect of head-lift exercise on the neck strength and swallowing function in patients with stroke. METHODS: Our study included 20 patients with stroke hemiparesis. All patients were randomly allocated to either the head-lift exercise or the conventional swallowing therapy group, and each group included 10 patients. All patients underwent the exercise over a mean period of 30 min daily for 6 weeks. Neck strength and swallowing function were assessed prior to and 6 weeks following the training period. We used a paired t-test to compare the within-group change before and after the intervention. We used an independent t-test to compare the between-group difference. The statistical significance level was set at ${\alpha}=.05$ for all variables. RESULTS: The head-lift exercise group showed a significant within-group change in terms of the neck strength and swallowing function (p<.05). The conventional swallowing therapy group also showed a statistically significant change (p<.05). A statistically significant difference was observed between the head-lift exercise and the conventional swallowing therapy group with regard to the change in both, the neck strength and swallowing function after application of the intervention (p<.05). CONCLUSION: This study provides valuable information for future studies in this field. Further studies involving a wider range of patients and a longer experiment span are required to strengthen the results of our study.

• Journal of the East Asian Society of Dietary Life
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• v.25 no.4
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• pp.549-564
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• 2015

This study was conducted on the head family house of Panseogong coterie of Andong Kwon clans in Daksil village, Bongwha gun, Kyungbuk: historical sources survey and field visit over four rounds were conducted from March to June 2014. In-depth interview, storytelling, and nutrition facts were used as methods of research using 49 participants, and the potentials of trend goods were the main purpose of this research. The specialties of bongwha prefecture in the Chosun Dynasty were pine nut, manna lichen, ginseng, sweetfish, and wild honey. Ritual food bulcheonwi's offerings a feature in Choongjae Kwonbeol's head family - were sacred wine, me, gang, otang, myun, myunjeok, pyunjeok, pyunchung, pyun, po, chungpomook, dojeok, sookchae, ssam, chimchai, sikhye, chogwa, silgwa, soojunggwa, etc. The ritual foods of bulcheonwi's head family house Choongjae Kwonbeol were commercialized through storytelling. Choongjae Kwonbeol's ritual ceremonies, recognized for their national royalty, were reorganized as the traditional Korean table settings, so that the Korean people could easily access them. The special meal called "Geumgyeporansang" represented the head family house foods' essence to share and serve others through the Dacshil village's natural beauty, Bonghwa's local ingredients, and festivities after the "Chungjae Gwunbal Bulchun" rituals. The ritual foods called "Cheongamjungsang", utilizing "Chungjae Gwunbal Bulchun" rituals, were represented in the form of a lunch box: such foods illustrate the classical scholar's mindset that enjoys the nature and arts through education and virtue.

• Journal of Trauma and Injury
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• v.25 no.4
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• pp.122-131
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• 2012

Purpose: Diffuse axonal injury (DAI) is clinically defined as a coma of over six hours in a head trauma victim without a focal mass lesion. The emergency physician usually resuscitates and stabilizes a comatose head trauma victim in the emergency Department. After assessment and treatment, the prognosis is very important to both the victim and the physician. The prognosis for DAI is based on Glasgow Coma Scale (GCS) and other imaging data. We investigated the prognostic value of computed tomography (CT) and gradient-echo magnetic resonance imaging (GRI) for head trauma victims with DAI. Methods: Fifty-three(53) head trauma victims of DAI were enrolled in this study from 2007 to 2012. During the study period of six years, data on trauma victims were collected retrospectively. We analyzed the differences in the Glasgow Outcome Scale (GOS) result between the CT and the GRI modalities. Results: We classified the study group by using GOS. Between the good outcome subgroup (GOS scores of 4 and 5) and the poor outcome subgroup (GOS score of 1-3), there were no statistical difference in sex, age, initial vital signs and initial GCS score. The good outcome subgroup had non-hemorrhage on CT(52%), which was correlated with good outcome and a shorter awakening time, while a larger number and a deeper location of hemorrhagic lesions on in GRI were correlated with poor outcome in DAI. Conclusion: We conclude that the existence of hemorrhagic lesions on CT, and the number and location of those lesions on GRI had good prognostic value for head trauma victims with DAI.

• Journal of the Korean Society of Physical Medicine
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• v.12 no.2
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• pp.121-127
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• 2017

PURPOSE: Forward head posture and turtle neck are common musculoskeletal disorders of the cervical vertebrae. The purpose of this study was to investigate the effects of combined exercise training and chiropractic on the grip strength and cervical muscle strength of subjects with forward head posture and turtle neck. METHODS: The subjects were divided into two groups: forward head posture (n=9) and turtle neck (n=9). Both groups performed combined exercise training and chiropractic. The subjects were instructed about the exercise training once a week. This training was performed for 30 minutes every day for 8 weeks, and the chiropractic was performed for 15 minutes once a week. The cervical muscle strength and grip strength were measured. Two-way repeated measured ANOVA was performed for statistical analysis. RESULTS: In changes to the left grip strength, the main effect over time was significant, but the interaction effect and the main effect in the groups were not significant. In changes to the right grip strength, no difference was found to be statistically significant. In changes to the cervical muscle strength, no difference was found to be statistically significant. CONCLUSION: The increases of grips strengths and cervical muscle strength in forward head posture group were greater than turtle neck group but there were not found to be statistically significant.

• Radiation Oncology Journal
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• v.31 no.1
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• pp.1-11
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• 2013

Purpose: Compared to conventional radiotherapy (RT), intensity-modulated radiotherapy (IMRT) significantly reduces the rate of treatment-induced late toxicities in head and neck cancer. However, a clear survival benefit of IMRT over conventional RT has not yet been shown. This study is among the first comparative study to compare the survival rates between conventional RT and helical tomotherapy in head and neck cancer. Materials and Methods: From January 2008 to November 2011, 37 patients received conventional RT and 30 patients received helical tomotherapy for management of head and neck cancer. We retrospectively compared the survival rates between patients treated with conventional RT and helical tomotherapy, and analyzed the prognostic factors for survival. Results: The 1- and 2-year locoregional recurrence-free survival rates were 61.2% and 58.1% for the conventional RT group, 89.3% and 80.3% for the helical tomotherapy group, respectively. The locoregional recurrence-free survival rates of the helical tomotherapy group were significantly higher than conventional RT group (p = 0.029). There were no significant differences in the overall and distant metastasis-free survival between the two groups. RT technique, tumor stage, and RT duration were significant prognostic factors for locoregional recurrence-free survival. Conclusion: This study showed the locoregional recurrence-free survival benefits of helical tomotherapy in the treatment of head and neck cancers.

• Smart Media Journal
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• v.11 no.5
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• pp.17-25
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• 2022

Korean part-of-speech taggers decompose a compound morpheme into unit morphemes and attach part-of-speech tags. So, here is a disadvantage that part-of-speech for morphemes are over-classified in detail and complex word types are generated depending on the purpose of the taggers. When using the part-of-speech tagger for keyword extraction in deep learning based language processing, it is not required to decompose compound particles and verb-endings. In this study, the part-of-speech tagging problem is simplified by using a Head-Tail tokenization technique that divides only two types of tokens, a lexical morpheme part and a grammatical morpheme part that the problem of excessively decomposed morpheme was solved. Part-of-speech tagging was attempted with a statistical technique and a deep learning model on the Head-Tail tokenized corpus, and the accuracy of each model was evaluated. Part-of-speech tagging was implemented by TnT tagger, a statistical-based part-of-speech tagger, and Bi-LSTM tagger, a deep learning-based part-of-speech tagger. TnT tagger and Bi-LSTM tagger were trained on the Head-Tail tokenized corpus to measure the part-of-speech tagging accuracy. As a result, it showed that the Bi-LSTM tagger performs part-of-speech tagging with a high accuracy of 99.52% compared to 97.00% for the TnT tagger.

• Archives of Reconstructive Microsurgery
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• v.17 no.1
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• pp.19-27
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• 2008

Purpose: Microvascular reconstructive surgery has become an integral part of the treatment of head and neck cancer patients. This review of 121 free flaps for head and neck cancer patients performed over the last 11 years was done to evaluate circulatory crisis, salvage, and secondary reconstruction and to investigate which factors may contribute to these rates. Method: Nine emergent explorations among 121 head and neck reconstruction with free flaps were reviewed to analyze detection of vascular crisis, the time interval from detection of circulatory crisis to exploration, operation procedures and results, and secondary reconstructions. Emergent exploration was done with our protocol. Result: Nine free flaps exhibited signs of vascular problems between 1 day and 6 days postoperatively. The emergent exploration rate of this series was 7.4% (9/121). The salvage rate was 55.6% (5/9), giving an overall flap viability of 96.7% (117/121). In our study, preoperative radiation therapy, positive smoking history, alcohol consumption history, combined disease such as diabetes mellitus and hypertension, recipient vessels and types of vascular anastomosis were not related to the causes of circulatory crisis. The mean time interval between the onset of clinical recognition of impaired flap perfusion and re-exploration of the salvaged 5 flaps was 3.2 hours, that of failed 4 flaps was 11.25 hours. Conclusion: Despite high overall success rate, relatively low salvage rate may be attributed to late detection of circulatory crisis and in long time interval between detection and exploration. We conclude that early detection of circulatory crisis and expeditious re-exploration are a matter of great importance for the success of salvage operation.

• Korean Journal of Head & Neck Oncology
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• v.37 no.2
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• pp.51-55
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• 2021

Background/Objectives: Extracapsular dissection has the advantage of reducing complications by minimizing tissue loss of the parotid without intentionally exposing the facial nerve in patients with benign parotid tumor. However, there has been controversy over the surgical results. Thus, the surgical outcomes of extracapsular dissection for benign parotid tumor was compared to those of superficial parotidectomy. Materials & Methods: A retrospective chart review was conducted with 132 patients who received surgery for benign parotid tumor in our center from January 2014 to December 2018 retrospectively. Results: A total of 132 people were enrolled, with 62 people receiving extracapsular dissection, 38 people receiving partial superficial parotidectomy and 32 people receiving superficial parotidectomy. No significant difference was found between the three groups regarding complications such as facial nerve palsy, Frey's syndrome, or first bite syndrome. Operation time and hospital stay was significantly short in extracapsular dissection group. Conclusion: For well-selected cases, extracapsular dissection can be considered as an option for surgery of benign parotid tumor.