조선업 근로자의 족부백선 유병률 및 관련 요인

서호석,유철인,이충렬,이지호,김양호,이원신,최지호,성경제,고재경,문기찬 大韓産業醫學會 2002 대한직업환경의학회지 Vol.14 No.4

목적: 울산지역에 소재한 대규모 조선업종 근로자 1,419명을 대상으로 족부백선의 유병률을 조사하고 족부백선의 유병률에 미치는 요인을 조사하여 족부백선의 작업관련성을 알고자 본 연구를 실시하였다. 방법: 근로자 건강진단시 족부백선의 유뮤를 확인하고, 현재 족부백선의 위험인자로 알려져 있는 여러 요인들과 작업, 환경적인 요인들에 대하여 설문조사를 실시하고, 족부백선의 임상적인 양상을 관찰하였다. 결과: 조사결과 족부백선의 유병률은 54.8%로 높게 나타났으며, 직종과 공동목욕탕 이용 유무, 안전화 착용유무, 작업형태, 가족력 유무가 족부백선이 유병률에 영향을 미치는 위험인자로 나타났으나, 다변량 분석결과 가족력과 공동목욕탕 이용만이 통계적으로 유의한 위험인자로 나타났으며(P<0.05), 안전화 착용은 통계적으로 유의하지 않았다. 결론: 이상의 결과에서 사업장내 근로자들의 족부백선의 높은 유병률과 관련된 직접적인 요인은 사업장내의 공동 목욕탕의 이용 여부와 족부백선의 가족력임을 확인할 수 있었으며, 많은 근로자들이 원인으로 지목한 안전화의 착용은 통계적인 유의성은 없었다. 따라서 족부백선이 작업과 직접적으로 관련되었다는 근거는 적은 것으로 보인다. 하지만 일반인보다 높은 유병률을 보이는 것으로 확인된 사업장내 족부백선의 유병률을 감소시키기 위해서는 위험인자로 최종 확인된 작업장 내의 공동 목욕탕의 철저한 위생관리와 함께 가족간의 감염을 예방히기 위한 개인위생관리가 필요하면, 비록 통계적인 유의성은 없었으나 여러 근로자들이 원인으로 지목한 안전화의 개선에도 노력해야 할 것으로 생각한다. Objectives: Recently, tinea pedis has been reprted to be a type of occupational dermatoses because of its high prevalence in specific working conditions. Although there is no doubt that the environment surrounding work places, the usual habits of workers erc ate intimately related to this skin conditions, there is some controversu as to whether or not this condition is a real occupational illness and what is the exact cause of the high prevalence of this illness is. In this study, the prevalence of tinea pedis in workers from the shipbuilding industry was investigated andthe risk factors of this disease were evaluated. This study also aimed to verify whether or not tinea pedis is one of the occupational diseases. Methods: The result of interviews, questionnaires and clinical findings from 1,419 workers who visited the occupational health center for an annual routine check for their health state were analyzed. Results: Among the 1,419 workers, 778 workers (54.8%)had tinea pedis. By simple logistic regression analysis, the prevalence of tinea pedis was found to e affected by some variables, including the jov category, the types of work, the kinds of footwear, whether or not they were using communal baths in the work places, and a family history of tinea pedis. In contrast, by multiple logistic regression analysis, only utilization of the communal baths in the work places and a family history of tinea pedis turned out to be statistically significant risk facrors. Conclusions: In this study, the major factors contributing to the high prevalence of tinea pedis are the use of communal baths in the workplace and a positive family history. However, the wearing of safety shoes was not statistically significant. Therefore, tinea pedis could not be confirmed to be an occupational disease. On the basis of these results, a solution to the environmental hygiene of communal bats and the personal hugiene of individuals needs to be improved in order to prevent tinea pedis.

부산, 울산, 경남지역 직업병감시체계에서 나타난 수지진동증후근의 역학적 특성

최영희,유철인,이지호,이충렬,이헌,김영욱,채창호,고상백,김은아,이유진,김양호 大韓産業醫學會 2003 대한직업환경의학회지 Vol.15 No.3

목적: 국내에서도 국소진동에 의한 수지진동증후군이 다수 있을 것으로 추정하나 최근에 이에 대한 보고가 적어 부·울·경 직업병감시체계를 통하여 수지진동증후군에 대한 환례를 수집하여 이의 역학적 특성을 밝히고자 본 연구를 실시하였다. 방법: 2001년 44월부터 2002년 12월까지 부산, 울산, 경남지역에 있는 종합병원 9곳을 통하여 특수 건강진단과 산업의학과 외래를 방문한 근로자를 대상으로 진동폭로에 대한 설문조사를 실시하고 이들중에서 수지진동으로 인한 증상을 호소하는 근로자는 이학적 검사와 Stockholm workshop scale을 이용하여 수지진동증후군이 있는지 평가하였다. 결과: 남자 188명, 여자 4명 등 총 192례의 수진진동증후군이 의심되는 환례를 수집하였으며, 업종별로는 조선업에 종사하는 근로자들이 가장 많았다. 국소진동의 주된 폭로원은 그라인더가 가장 많았으며, 혈관장해로 인한 증상보다 감각신경성 장해로 인한 증상을 많이 호소하였다. 결론: 전국적으로 조선업종의 그라인더 사용자를 중심으로 많은 수의 수지진동증후군의 환자가 있을 것으로 추정되며, 이들에 대한 예방대책을 마련하기 위하여 전국규모의 정확한 유병률 조사 및 실태파악이 필요한 것으로 판단된다. Objects: The objectives of this study were to estimate the epidemiologic characteristics of hand-arm vibration syndrome (HAVS) due to occupational exposure of hand transmitted vibration and to identify the occupations and industries where such exposures arises, and the main sources of exposure. Methods: In April 2001 the Busan, Ulsan, and Kyung-Nam Province occupational disease surveillance system was established to measure the incidence and prevalence of work-relatd HAVS and other occipational diseases in these Korean provinces. Occupational physicians of nine hospitals in Busan, Ulsan, and Kyung-nam Province were involved in this project between April 2001 and November 2002. Physicians collected information through questionnaires and interviews. Information gathered included age, occupation, types of vibration tools used and presence of subkective symptoms such as vibration-induced white finger (VWF), numbness and tingling. Results: A total 192 cases were reported with 188 males and 4 females. The shipbuilding industry was the most common type of industry and grinders were the most common source of exposire. Symptoms of neurological disorder were more common than those of vascular disprder. Conclusions: The authors concluded that exposure to hand transmitted vibration is common and that HAVS is one of the most common occupational diseases in Korea. However, the range and extent of hand transmitted vibration and the overall prevalence of HAVS in Korea is still unknown. More extensive research on this syndrome in order to priorite necessary preventive measures is required.

충격내압을 받는 두꺼운 원통의 비선형 동적해석

金忠浩 慶星大學校 1992 論文集 Vol.13 No.3

Dynamic loading of structures often causes a over-stresses, deviation of the elastic range and geometrical large deflection. Thus, in many case, material and geometrical nonlinear effects should be considered in dynamic analysis. In this research, material nonlinear behavior were considered by adopting elastoviscoplastic material represented by 1-D. rheological model. Geometrical nonlinear effects were considered with modifing the straindisplacement matrix by adding to the Green-Langrange's nonlinear strain terms, In appling the thick sylinder subjected to impulsive internal pressure, the results were reasonable in practice.

시험 스트레스시 적대감이 혈청 코르티솔 농도와 혈압 및 맥박에 미치는 영향

이충원,박정호 啓明大學校 醫科大學 1995 계명의대학술지 Vol.14 No.4

This study was designed to test the hypothesis that the students with high hostility scores were associated with higher serum cortisol vlevels, and higher responsivity of blood pressure and pulse rate, under the written examination stress in comparison to the students with lower hostility scores. Fifty two medical students gave informed consents to participate in the study. Hostility levels were measured by the Cook-Medley hostility scale, and the response variables were serum cortisol, systolic and diastolic blood pressures, and pulse rates. Coo-Medley hostility scale were administered about one month prior to examination, Serum cortisol levels, systolic and diastolic blood pressures, and pulse rats were measured three times durung the experimental period, about one month before examination, during examination and about one month after examination, respectively. Serum cortisol levels were measured in duplicates by the Coat-A-count radioimmunoassay procedure(??I) and blood presures and pulse rates were measured by two standardized automatic sphygomomanometers. The response variables compatible with the hypothesis were serum cortisol and pulse rate in Cook-Medley hostility tatal scores where serum cortisol concentration of the student with low total scores was 9.43±μ21.82 g/dl and that of the students with high total scores was 9.56 ±2.97 ㎍/dl before examintion. The former showed little changes(9.36±2.34 ㎍/dl) but the latter did a marked increase(11.14±2.14 ㎍/dl) during examination and the serum cortisol levels of both returned to the baseline levels after examination(Period and periodXsubjects effects, p<0.05). And serum cortisol in cynicism subsets and pulse rate in paraniod aliennation subset of Costa et al's two subsets and serum cortisol, systolic blood pressure in social avoidance subset of Barefoot et al's six subsets were compatible with the hypothesis. Serum cortisol levels showed a borderline significance with cynicism subset of Barefoot et al's (0.05<p<0.1). These results suggest that total scores and some subsets of Cook-Medley's hostility scale may be involved in the biomechanism between hostility and coronary heart disease.

치과의사의 장애인 치과진료실태에 관한 조사 연구

최충호 대한구강보건학회 2003 大韓口腔保健學會誌 Vol.27 No.1

The purpose of this study were to prepare baseline data for developing and implementing oral health policies in disabled people. So it was stueied that dental services status of the disabled performed by dentists. Dentists's recognition about the dental treatment of the disabled was investigated, and professional, institutional, and social problems were analyzed. Survey was performed in 10,493 dentists with questionnaire by mailing method. The rerurned rate of answer was 5.0% The questionnaire contained dental treatment experience for the disabled, what are the desirable dental treatment for the disabled, the difficulty and the method to solve the problem when dentists treat the disabled, the demand of oral health education in realtion to dental treatment of the disabled. The obtained results were as follows; 1. The characteristic of the respondents and dental treatment experience for the disabled; Respondents had a more rate in male(77.2%), under 40 years old(60.6%), 5-9 years of dental practitioner(40.2%), a lage city(60.3%) and dental clinic by oneself(87.1%). Many respondents had concern about dental treatment for the disabled(77.2%) and the had a experience of dental treatment for the disabled(94.0%). The dentists who treat the disabled days was 47.7%. The dentists who want to participate with network for treating disabled was 63.6%. 2. Desirable dental treatment type for the disabled; Many dentists treated disabled patients in their clinic(past:62.2%, present:46.5%). So they want to treat the disabled in specialized institute(42.5%). It needs more acceptable conditions-like support system for the cost and time consuming problem for the disabled. 3. The problems and the solutions of the disabled's dental health; The difficulty of cooperation and insufficiency of specialty or confidence was main problems. So they needed treating equipment for the disabled and improvment of specialty. Decreased ability of disabled's dental health management(52.4%) was main problem to promote the disabled's dental health. The suggested solutions were the obligation of facilities for disabled's dental treatment in new dental service institute(34.1%)and the improvement of social recognition for the disabled(22.1%). 4. The need and experience of education for disabled's dental treatment; The dentists who had the experience of education were 41%. They received the information in dental college(19.7%), books(8.3%), graduate or training course(6.8%) , small group study(2.9%) and education for dental practitioners(1.5%). The needs of education were understanding of the disabled(32.7%), behavior control therapy(30.4%), changing of treatment method according to the degree of disabled(25.8%) and the education for emergency situation(5.9%).

통신상품간 시장잠식현상과 경쟁도입의 효과분석

이상호,정충영,이현우 한국경영과학회 1996 한국경영과학회지 Vol.21 No.1

We consider a consumer self-selection model in which a regulated firm faces two market segmants wig differing valuation of quality of telecommunication services and examine some economic implications from the behaviors of the firm. In the context of a regulated monopolist, even though the results depend on the degree of privatization, the firm could lower the quality of the low-end model and reduce the price of the high-end in order to alleviate cannibalization. This justifies the provision of universal service policy in the telecommunications market. Based on this self-selection model, we also analyze an extended model of product introduction and show that the monopolist will introduce new product with the same introduction time of social planner. However, when we consider competition among firms, the market equilibrium may not guarantee the efficient time of product introduction.

번호이동성제도 시행 이후의 소비자 행동에 관한 실증분석

윤충한,정준호 한국정보사회진흥원 2006 정보화정책 Vol.13 No.2

우리나라 이동전화시장의 공정한 경쟁을 위해 도입된 번호이동성 제도는 제도 시행이후 시장에 여러 가지 긍정적인 변화를 가져온 것으로 판단된다. 제도 시행이후 가입전환은 증가하였으며, 시장점유율의 차이는 줄어들고 허핀달지수는 지속적으로 내려가고 있는 등 시장구조에 상당한 변화가 일어나 이동전화시장이 더 경쟁적인 상태로 변화하고 있음을 보여 준다. 본 연구는 집계변수 측면에서 확인되는 이러한 이동전화시장의 변화가 번호이동성으로 소비자들의 선택이 더욱 용이해지고 가입전환에 드는 비용이 줄어들어서 발생하는 현상인지를 직접적으로 확인하기 위해 소비자선택모형을 이용하여 시장의 번호이동성제도의 효과를 실증적으로 분석하였다는 점에서 의의가 있다. 관측되는 가입전환의 증가 현상이 실제로 번호변경에 따르는 비용으로 오랫동안 가입전환을 하지 못했던 소비자들이 대거 번호이동하였기 때문에 나타났다는 본 연구의 실증분석 결과는 전환비용과 번호이동제의 효과 분석에 많은 시사점을 준다.

B 림프구 활성화 자극에 따른 Interleukin-4 수용체와 Type II IgE 수용체 발현조절양상의 상호관련성

이충은,윤석란,변광호,소의영 大韓免疫學會 1995 大韓免疫學會誌 Vol.17 No.3

Interleukin-4(IL-4) specifically induces the expression of its own receptor, IL-4R and type II IgE receptor, FceR1l in a dose-dependent manner in human B lymphocytes. We observed that the IL-4-induced expression of IL-4R and Fce Rll were both down-regulated by interferon-T(IFN-T) at mRNA as well as surface protein levels in normal B lymphocytes. Such co-ordinated regulation of the IL-4-induced IL-4R and FceRlI also occurred by anti-CD40 and steroid, each regulating the IL-4-induced response in an opposite direction. While anti-CD40, which is re-ported to agument the IL-4-induced B cell activation, further enhanced the IL-4-induced IL-4R and Fee RU expression, methylprednisolon(MPD) strongly inhibited the level of these receptors. The anti-CD40 or MPD-induced modulation of the IL-4-induced IL-4R and FceRII was further subject to the down-regulation by lFN-T. As compared to normal B lymphocytes, a differential regulation of IL-4R and FceRII was noted in a transformed B cell line, where IFN- Tup-regulated the IL-4-induced responses. Still, there was a co-ordinated regulation of the IL-4R and FceRII in these cells. Taken together, these results suggest that modulation of IL-4R expression and FccRII induction are closely correlated events during the IL-4-induced cellular activation

Chlorpromazine으로 유발된 음경지속발기증 1례

신유호,윤도준,이충현,송지영,이상철 大韓神經精神醫學會 1996 신경정신의학 Vol.35 No.3

저자들은 항정신병약물 chlorpromazine 치료 중에 음경지속발기증이 발생하여 수술까지 시행하여 회복된 환자 1례를 체험하였기에 문헌고찰과 함께 보고하였다. 항우울제 trazodone과 함께 chlorpromazine, thioridazine과 같은 항정신병약물이 음경지속발기증의 원인과 관련이 있는 것으로 알려지고 있다. 이러한 약물에 의해 유발되는 음경지속발기증의 기전에 대해서는 알파-아드레날린 차단으로 인한다는 설이 많은 지지를 받고 있다. 치료는 보존적인 치료와 외과적인 치료가 있으며, 외과적인 치료로는 음경해면체 천자와 흡입 세척술 그리고 분로를 만들어 주는 방법들이 있다. 음경지속발기증은 신속한 진단과 치료를 하지 않을 경우 영구적인 발기불능을 초래할 수도 있는 부작용이므로 향정신약물 투여시 이에 대한 관심과 주의를 가져야 할 것이다. Antipsychotic drugs can induce several sexual side effects. Priapism, one of the side effects, is defined as "the persistent abnormal erection of the penis, which usually occurs without sexual desire". There has been an increasing number of reports recently linking the etiology of priapism with psychotropic medication. The drugs known to be associated with priapism are psychotropic drugs such as trazodone, chlorpromazine, thioridazine as well as antihypertensives, anticoagulants and so on. The mechanism of a drug which induces priapism is proposed to be mediated by its alpha-adrenergic blocking effect. Prompt diagnosis and treatment are essential. Priapism is a severe side effect, which can lead to impotence if prompt diagnosis and treatment are not carried out. There are medical and surgical treatments for priapism. The surgical treatments usually involve aspiration, irrigation and the creation of shunt. We report a case of priapism which developed after two years of chlorpromazine treatment. He is a 20-year-old man with schizophrenia. He experienced two times of brief episode of prolonged penile erection before developing intractable priapism. He was treated by shunt operation which showed satisfactory relief of priapism. It seemed by this case that duration and dosage of chlorpromazine were not closely related with priapism. Psychiatrist is needed to give attention to the priapism as one of sexual side effects due to antipsychotics though it is not common.

TLD를 사용한 고층건물의 수치해석

홍은호,이충렬 부천대학 2004 論文集 Vol.25 No.-

現代의 高層建物設計는 强風이나 地震荷重으로부터 構造物의 安全性 및 使用性과 居住者의 便安함을 提供하는 問題들을 包含한다. 現代 高層建物의 剛性과 質量은 더 강한 材料와 複合 構造시스템을 使用하여 줄이고 있다 剛性과 質量의 減少는 과도한 水平振動으로부터 構造物에 발생할 수 있는 問題의 가능성을 줄여 준다. 居住者의 便安함과 安全性을 增加시키는 效果的인 方法을 硏究하는 革新的인 엔지니어들은 2가지 形態의 振動制御시스템을 사용한다. 하나는 受動制振시스템이고 다른 하나는 能動制振시스템이다. 이 論文은 受動制振시스템중에 同調液體댐퍼(Tuned Luquid Damper)에 대해 다루고자 한다. 선박에서 널리 사용되어진 TLD는 最近 構造物의 振動制御를 위해 사용되고 있다. TLD는 움직이는 質量으로서 물 또는 다른 液體를 사용하고 復原力은 重力을 사용한다. 에너지 吸收는 液體와 容器의 摩擦과 液體流動시의 출렁거림으로 한다. 構造物의 運動에너지를 吸收하는 TLD의 基本 原理는 TMD와 같다. The design of modern tall buildings involves certain problems, such as safety and serviceability of the structure and comfort of occupants result from strong wind or earthquake loads. The stiffness and mass of modern tall buildings have been reduced by using higher strength materials and better integrated structural systems. These decreases in stiffness and mass have increased the possibility of structural problems arising from excessive lateral vibration. Innovative engineers in their search for effective ways of increasing the comfort and safety of occupants make use of two types of vibration control system. One is passive control system and the other is active control system. This thesis deals with the tuned liquid damper of passive control systems Tuned liquid dampers which have been widely used in ships are recently implemented for vibration control of structures. A TLD uses water or other liquids as the moving mass and restoring force is generated by gravity. Energy absoption comes from boudaries between liquid and containers and turbulence in the liquid flow. The basic principle of TLD to absorb kinetic energy of the main structure is the same as TMD.