한국 초·중·고등학생들의 측두하악장애 유병상태와 악안면외상과의 관련성

정기호,권호근,김진범,최충호 대한구강보건학회 2003 大韓口腔保健學會誌 Vol.27 No.2

The purpose of this population-based epidemiologic study was to clarify the tempromandibular disorders prevalence, the maxillofacial trauma experience rate and the relation between maxillofacial truma and tempromandibular discorders in 6-14 and 16 years old korean children who were selected through the stratified random sampling method. the results are as follows; 1. The prevalence of tempromandibular clicking sounds was 1.28% in elementary students, 11.05% in middle school students, 20.07% in high school students, with an overall 6.30%. The result of the statistical test showed that girls experienced more tempromandibular clicking sounds than boys(p<0.05). 2. The prevalence of tempromandibular pain was 0.51% in elementary students, 1.95% in middle school students, 7.04% in high school students, with an overall 20.07%. 3. The prevalence in mouth opening limitation was 0.04% in elementary students, 1.36% in middle school students, 5.85% in high school students, with an overall 1.06%. 4. The percentage of treatment experience for the tempromandibular disorders was 0.00% in elementary students, 0.77% in middle school students, 2.12% in high school students, with an overall 0.46% 5. The maxillofacial trauma experience rate was 5.45% in elementary students, 9.11% in middle school students, and 11.89% in high school students, with an overall 7.22%. Males experienced more maxillofacial trauma than females(p<0.01), and urban students experienced more than rural students)p<0.05). 6. The results of the relation betwwen maxillofacial trauma and tempromandibuar disorders showed there were statistically significant realtionship between the tempromandibular experience and the clicking sound(odds ratio 1.86), and between the maxillofacial trauma and tempromandibular disorders(odds ratio 1.79).

8년간(1992~1999) 산업안전보건연구원에 의뢰된 직업병 심의 사례 분석

강성규,김규상,김양호,최정근,안연순,진영우,최병순,양정선,김은아,채창호,최용휴,김대성,박정선,정호근 대한산업의학회 2000 대한직업환경의학회지 Vol.12 No.2

Objectives : Pneumoconisis and noise-induced hearing loss (NIHL) have been reported as main occupational diseases by the Special Health Examination. The Industrial Accident Compensation Insurance has reported various work-related diseases, however, these two diseases occupied almost a half of compensated cases. Therefore, it was not well known about the status of occupational diseases other than pneumoconiosis, NIHL, and cardio-cerebrovascular accident (CVA). This study was conducted to analyze claimed cases as an occupational disease, that was requested to the Korea Industrial Safety and Health Agency (KOSHA). Methods : The local office of the Korea Labor Welfare Corporation (KLWC) has asked the KOSHA for confirmation of claimed cases as an occupational disease. We analyzed 379 cases requested from KLWC, the Ministry of Labor, employers, unions and occupational health agencies from 1992 to 1999. Results : Male was 80.7 % of the requested cases. Their mean age was 42 years old and 75.5 % of them were more than 35 years old. The requested cases were increased rapidly from 25 cases in 1992 to 108 cases in 1999 and the accept rate was 50.7 %. The majority of requested cases were respiratory diseases(22.4%), cancers(18.5%), Neuropsychiatric problems(14.5%), and musculoskeletal problems(13.5%). The accept rate was high in reproductive, respiratory, musculoskeletal and digestive disorders and low in neuropsychiatric, renal and otologic problems and occupational cancers. 73.6% of them were caused by chemical agents, especially 28.5 % were by organic solvents. 67% of them were clinically confirmed at university hospitals. A half of the cases were from KyongIn area, even the request came from the whole country. Conclusions : A claim was common in workers whose age was over 35 years old and exposure history was over 10 years. The respiratory diseases and neuropsychiatric disorders were still main problems in occupational health and occupational cancers was increasing even though its accept rate was not high yet.

신규 방사성 항암제 DW-166HC 의 소핵시험

문은이(Eun Yi Moon),이진(Jin Lee),이원용(Won Yong Lee),최청하(Chung Ha Choi),이덕근(Dug Keun Lee),유제만(Jei Man Ryu),정용호(Yong Ho Chung),윤성준(Sung June Yoon),박경배(Kyung Bae Park) 한국응용약물학회 1997 Biomolecules & Therapeutics(구 응용약물학회지) Vol.5 No.3

DW-166HC (^(166)Holmium (^(166)Ho)-Chitosan complex) is a new radiopharmaceutic anticancer agent with a broad anti-tumorigenic spectrum, especially against human hepatic cancer. DW-166HC was evaluated for the appearance of micronucleus in polychromatic erythrocytes (PCEs) of mouse bone marrow cells after subcutaneous arid intravenous single administration. Bone marrow cells were prepared at 24 hr and 48 hr after DW-166HC-I (^(165)Ho-Chitosan complex : cold compound) administration and at 24 hr, 72 hr and 2 weeks after DW-166HC (^(166)Ho-Chitosan complex : hot compound) administration. The results showed there was no statistically significant increase of the numbers of PCEs with micronucleus in all DW-166HC-I administered groups compared with a negative control group but there was statistically significant increase of the numbers of PCEs with micronucleus at 24 hr arid 72 hr in all DW-166HC administered groups, which was recovered after 2 weeks from the drug administration. The results also showed the ratio of normochromatic erythrocytes (NCEs) to PCEs of all DW-166HC-I administered groups was not significantly different from that of a negative controi group but there was significant difference of this ratio at 24hr and 72 hr in all DW-166HC administered groups compared with that of negative group, which was also recovered after two weeks from the drug administration. These results suggested that DW-166HC-I may not cause any chromosomal damage but DW-166HC has in vivo mutagenic potential because of its radioactivity.

중등도 두부외상 환자의 관리에 대한 임상적 고찰

정호성,박철완,이근 대한응급의학회 1993 대한응급의학회지 Vol.4 No.2

The aim of present study is to determine the initial treatment of patients who appeared to have sustained moderate head injuries when first evaluated a the department of emergency medicine. The authors reviewed the records of 221 patients whose initial Glasgow Coma Scale (GCS) scores ranged from 9 to 12, as well as another 96 patients with GCS scores of 13. All patient underwent brain computed tomography(B-CT) at the time of initial evaluation. In 55.8% of these patients the B-CT were abnormal, and 33.4% required neurosurgical intervention. The overall mortality rate was 12.3%. Over forty percent of patients with GCS scores of 13 had abnormal lesion on B-CT and 12.5% of them required neurosurgical operation. This results suggest that an initial GCS scores of 13 should be classified as the moderate head injury group. Above results indicate that all patients wit6h moderate head injury on intial examination must be admitted to the hospital and undergo urgent B-CT. Patients with intracranial lesion require immediate neurosurgical consultation and admission to critical-care unit. B-CT should be repeated in patients whose recovery is less rapid than expected and in all patients with evidence of clinical deterioration : this was necessary in almost half of the patient in this group, and 19.2% were found to have progression of radiological abnormality or had newly developed lesion on serial B-CT.

중첩 방전을 이용한 CO₂레이저의 동작 특성 : 다중펄스 중첩을 이용한 long 펄스형 CO₂레이저의 펄스 형상 제어 Pulse shape control of pulse CO₂laser using multiple-pulse superposition

정현주,김근용,정용호,정종한,송건주,김희제 부산대학교 생산기술연구소 2001 生産技術硏究所論文集 Vol.60 No.-

본 연구에서는 PIC 원 칩 마이크로 프로세서 기술을 접목시켜, 저전압 측에서 2단 또는 3단의 회로를 능동적으로 중첩시킴으로써, 다양한 펄스폭을 가지는 고전압의 펄스형상을 만들었다. 이렇게 만들어진 다양한 중첩펄스를 현재 산업용 및 의료용으로 많이 사용되고 있는 CO2 레이저에 적용하여 각 단의 스위치의 트리거 지연시간에 따른 레이저 빔의 출력 특성을 고찰하였다. 그 결과 다양한 펄스폭을 가지는 레이저 빔을 얻을수가 있었고 특히, 3단 중첩회로에서 스위칭 지연 시간을 변화시킴에 따라 얻어진 레이저 펄스폭은 최소 약 4ms였고 최대 약 10ms였다. In this study, a variable pulse length, high duty cycle Pulse Forming Network(PFN) is constructed by time sequence. The power supply for this experiment consists of three switching circuits. Each switching circuit uses 2 mesh PFN, a charging circuit, a HV leakage transformer, and bridge rectifier on each transformer secondary. The PFN elements operate at low voltage and drive the primary of HV leakage transformer. The secondary of the transformer has a full-wave rectifier, which passes the pulse energy to the load in a continuous sequence. We investigated laser pulse width of pulsed CO2 laser as various delay time among three switching circuits. As a result, we can obtain various laser pulse width from about 4 to 10ms.

경추 손상후 사망례에 대한 분석

정호성,김상은,이준형,박철완,이 근 大韓應急醫學會 1996 대한응급의학회지 Vol.7 No.1

Mortality after cervical spine injury(CSI) is reported as high as 10∼30%, and it is intimately related to the initial management and cardiopulmonary function. We analyzed the cause of death for 29 patients who expired at Chung Ang Gil Hospital after CSI between 1990 and 1994. Of 198 patients with CSI, 43 patients(21m7%) died. Except 14 cases with concomitant fatal head injury and/or multiple systemic injuries, the mortality rate of CSI was 14.6%. Male to female ratio was over 6:1. Fourth to sixth decades constituted 69.0%. Common causes of CSI were traffic accidents(58.6%) and fall/slip(34.5%). The level of CSI was above C5(upper cervical group: UCG) in 65.5%, and below C4(lower cervical group: LCG) in 34.5%. Most of them(86.2%) died within four weeks after CSI. Early death(within 7 days) was more common in the UCG(57.9%) than the LCG(20.0%). Associated injuries were found in 72.4%, and the head injury was the most common one. The higher the Injury Severity Score(ISS), the earlier the patients expired(Fisher`s test, P<0.05). On arrival, hypotension(systolic blood pressure below 90mmHg), bradycardia(less than 60/min), and respiratory arrest was found in 31.0%, 34.5% and 17.2%, respectively. The episode of bradycardia was found in 58.6%. It was more common in cases of early death(69.2%) than those of the late death(50.0%). Hypoxia, hypercarbia, and acidosis was observed in 20.7%, 17.2%, and 51.7%, respectively. Respiratory failure was responsible for the majority(89.7%) of death. In UCG and the cases of the early death, primary respiratory dysfunction was the main cause of death, while in LCG and the cases of the late death, pulmonary complication was the major reason(Fisher`s test P<0.01, P<0.01, respectively).

급성하벽심근경색에서 전흉부유도 ST절 하강의 의의

정병천,배호상,곽동훈,김영태,배용학,황종현,임현주,류재근,조용근,채성철,전재은,박의현 慶北大學校 醫科大學 1997 慶北醫大誌 Vol.38 No.2

목적 : 급성하벽심근경색증 환자에서 심전도상 흔히 동반되는 전흉부유도 ST절 하강의 의의를 알아보았다. 방법 : 심근경색후 24시간에서 48시간에 얻은 심전도를 기준으로 52명의 급성하벽심근경색증 환자를 전흉부유도에서 ST절의 하강이 있는 군과 없는 군으로 나누었으며 심도자, 관상동맥조영술, 심초음파도 및 방사성 핵종을 이용한 좌심구혈율 측정 등을 시행하였다. 결과 : 1) 좌심실확장기말압은 전흉부유도에서 ST절의 하강이 있는 경우에서 16.9±5.33mmHg로 없는 경우의 11.0±4.02mmHg보다 유의하게 높았다(p<0.05). 그러나 운동량 및 좌심구혈을은 흥부 유도상 ST절의 하강이 있는 경우 7.6±3.0 METs 및 53.9±9.1%로 없는 경우의 9.1±2.7 METs 및 54.6±9.5%보다 낮았으나 통계적 유의성은 없었다(p=0.180, p=0.823). 2) 관상동맥조영술상 전흉부 ST절의 하강이 동반된 군에서는 유의한 좌전하행지나 좌회선지의 협착이 있는 경우가 60.9% 및 57.9%로 ST절의 하강이 없는 군에서의 34.5% 및 7.7%와 비교해 좌관상동맥에 협착이 동반된 경우가 많았다(p=0.050, p=0.001). 3) 관상동맥조영술상 세 혈관질환의 빈도는 흉부유도상 ST절의 하강을 보인 23예에서 10예로 ST절 하강이 없었던 29예중 2예에 비하여 유의하게 많았고(P=0.007), 단 혈관질환의 빈도는 ST절의 하강을 보인 군에서 23예중 5예로 ST절 하강이 없었던 29예중 17예에 비하여 유의하게 적었다(P=0.002). 두 혈관질환의 경우에는 각각 8예와 10예로 양군간에 유의한 차이가 없었다. 4) 흉부유도상 ST절 하강의 빈도는 단 혈관질환 22예 중 5예에서, 두 혈관질환 18예중 8예, 세 혈관질환 12예 중 10예에서 관찰되어 협착이 있는 관상동맥의 수가 많을수록 ST절의 하강이 나타나는 빈도가 많음을 보였다(p=0.00308). 그러나 흉부유도상 나타난 ST절의 하강을 모두 합하여 구한 ST절 하강의 합은 협착이 있는 관상동맥의 수와 통계적인 유의성이 없었다. 5) 심초음파도상 좌심실 하벽의 벽운동은 ST절 하강을 보인 군에서는 akinesia가 83.3%, hypokinesia가 11.1%, 정상 벽운동이 5.6%로, ST절 하강이 없었던 군에서의 dyskinesia가 3.6%, akinesia가 39.3%, hypokinesia가 25.0%, 정상 벽운동이 32.1%와 비교하여 ST절의 하강이 있는 군에서 유의하게 벽운동의 장애가 빈번함을 보였다(p=0.03891). 그러나 좌심실전벽, 측벽 및 중격부위에서는 유의한 벽운동의 차이가 없었다. 결론 : 급성하벽심근경색증 환자의 전흉부유도에서 ST절의 하강이 동반되는 경우 다혈관 질환의 가능성이 높으며 좌심실확장기말압이 상승되었고 운동능력은 감소되어 있었다. 또한 심초음파도상 좌심실하벽의 벽운동장애도 심하였다. 따라서 전흉부 ST절의 하강을 동반한 급성하벽심근경색증 환자는 전흉부유도에 ST절 하강이 없는 경우보다 예후가 불량할 것으로 생각되며, 보다 적극적인 치료가 필요할 것으로 생각된다. The purpose of this study was to determine the significance of precordial ST segment depression appearing during acute inferior myocardial infarction and to assess the correlation of that with angiographic finding. 52 patients were allocated into two groups based on the existence of precordial ST segment depression : 23 patients with ST segment depression and 29 patients without ST segment depression. The extent of coronary artery disease as well as the prevalence of significant stenosis (≥70%) in left anterior descending artery were more frequent in patients showing precordial ST segment depression than in patients not showing them (p=0.050) and the result were similar in cases of left circumplex artery (p=0.001). On echocrdiographic examination of left ventricular (LV) wall motion, it showed more severely decreased inferior LV wall motion in patients showing precordial ST segment depression than in patients not showing them (p=0.03891) even though the other segment of LV wall motion didn't show the statistical difference between both groups. The other cardiac parameters such as LVEDP, exercise amount (METs) and ejection fraction were tend to showing bad profile in patients with precordial ST segment depression. From the above results, we could deduce that patients with precordial ST segment depression have relatively large infarction or concomitant left coronary artery disease, so they need more caution and intensive theraphy.

압밀배수공법에 따른 압밀효과 비교 연구

정진호,김근수 釜慶大學校 1999 釜慶大學校 論文集 Vol.4 No.1

The feed-back analysis based both on the in-situ measured values of the settlement of the embankment and on the soil properties of soft clay under the embankment is carried out in this thesis for the Preloading method and the Vertical drains, such as the Pack drains and the P.V.D.. The feed-back analysis is performed with the TCON program which has generally been used to estimate the average degree of consolidation and the final settlement of soft clay under the surcharge. From the results of the feed-back analysis for the final settlement, we can find that there are no significant differences in the behavior of consolidation between the Pack drains and the P.V.D. - the Pack drains show 73.6~75.8% of the average degree of consolidation, the P.V.D., 68~75% and the Preloading method, 48.5~58.7%. Asaoka, Hyperbolic and Hoshino method are also used to predict the final settlement of the embankment ofr the Vertical drains and the Preloading method. The final settlement estimated by the Hyperbolic method appears to be the most close to that by the feed- back analysis.

통화론적 접근법에 의한 한국의 對EURO貨 환율결정의 실증분석

정근존,정기호 慶北大學校出版部 2004 經商論集 Vol.32 No.1

Based on the monetary approach, we empirically analyzed the determination of the Korean exchange rate against the Euro for the period of 1994: 1/4-2003: 3/4 through the Johansen cointegration method. The result shows that the estimated coefficients of explanatory variables are not consistent with the theory when we use M1 as a money stock. On the other hand, using M2 or M3 as a money stock, the effects of real income, money stock and interest rate are consistent with theory and the estimated coefficients of such variables are statistically significant. Particularly, the estimated coefficient of the interest rate is found negatively, implying that the rigid-price model is superior to the flexible-price model in explaining the Korean exchange rate against the Euro. In addition, by using the mid or long-term instead of short-term interest rate in the model, the effects of explanatory variables are quite obvious. Furthermore, in the real-interest differnece model containing the expected inflation measured by the adaptive and extrapolating method, the estimated coefficients of explanatory variables are consistent with theory and statistically highly significant when M2 is used as a money stock.

피판을 이용한 구강악안면 결손부의 재건

이동근,이재은,정호용 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.4

The reconstruction of major head and neck defects must be an integral part of the overall cancer treatment plan. The priorities of surgical treatment of head and neck tumor are 1) local tumor control, 2) relief of pain, 3) avoidance of difficult dressing, 4) provision of oral continence, and 5) ability to swallow and manage saliva. The recent advances in reconstructive surgery including the development of musculocutaneous flaps and microvascular free tissue transfer have allowed the surgical restoration of head and neck tumor defects that previously were not possible. These techniques have provided the opportunity to undertake larger, more aggressive resection while at the same time permitting functional rehabilitation. The timing of reconstruction demands on the nature of the resection, the ability of the ablative and reconstructive teams to coordinate efforts, the overall health of the patients, the patient's needs and wishes. So, we report to emphasize current methods for restoring major head and neck tumor defects after tumor ablation, reviewing for the reconstructive operations, postoperative complications, and postoperative sequelae etc, of patients from Jan, 1990 to Dec, 1993.