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.

차세대 레진개발을 위한 광중합형 복합레진의 마모와 화학적 분해

양규호,최남기,육근영 大韓小兒齒科學會 2004 大韓小兒齒科學會誌 Vol.31 No.4

복합레진은 치질과 우수한 결합력을 가지며 심미적인 이유로 치과의 대표적 수복재로 자리잡고 있다. 그러나 저작력에 따른 마모와 구강내 환경에서의 수분흡수에 따른 가수분해가 복합레진의 강도약화를 야기하고 있다. 실험에 사용된 복합레진은 현재 임상에서 많이 사용되고 있는 Point4, Tetric flow, Heliomolar flow, FiItek supreme 이다. 각 제품의 화학적 분해와 마모도를 평가하기 위해 각각 10개의 시편을 제작하여 그 중 5개는 37℃의 수중하에 1Kg의 하중을 가하여 10,000 cycle동안의 마모도를 측정하였다. 나머지 5개 시편은 무게 측정을 한 후, 0.1N NaOH 용액, 3ml에 저장하여 60℃에서 보관한 후 2주 후 제거하여 1.23% HCI로 2시간 동안 중화하고 증류수로 세척한 후 60℃에서 건조하였다. 무게 손실, 분해층 깊이 및 시편내의 Si의 농도 변화, 최대 마모 깊이를 근거로 평가하여 다음과 같은 결과를 얻었다. 1. 각 제품의 무게 손실량은 Heliomolar flow, Filtek supreme, Point4, Tetric flow 순이었으며 Heliomolar flow, Filtek supreme을 제외한 다른 제품간에는 유의한 차이를 보였다(P<0.05). 2. 각 제품의 표면하 분해층 깊이는 Filtek supreme, Heliomolar flow, Tetric flow, Point4 순이었으며 Heliomolar flow, Tetric flow을 제외한 다른 제품간에는 유의한 차이를 보였다(P<0.05). 3. 각 제품으로부터 용출된 Si은 Filtek supreme, Heliomolar flow, Point4, Tetric flow 순이었으며 Point4, Tetric flow을 제외한 다른 제품간에는 유의한 차이를 보였다(P<0.05). 4. 최대마모깊이 측정시 Heliomolar flow, Point4, Filtek supreme, Tetric flow 순이며 0.1 N NaOH 용액에 보관한 레진의 마모깊이가 물에 보관한 레진에 비해 증가한 양상을 보였다. 5. 주사전자현미경 관찰시 NaOH 용액에 보관한 후 레진 기질과 충전제 사이의 결합의 파괴를 관찰 수 있었으며, 공촛점 레이저 현미경 관찰시 NaOH 용액에 보관한 후 수복재의 기질과 충전제 사이의 파괴양상인 분해층 깊이를 관찰할 수 있었다. The aim of this study was to evaluate the resistance to degradation and to compare the wear resistance characteristics of four composite resins in an alkaline solution. The resistance to degradation was evaluated on the basis of mass loss(%), degradation depth(㎛). Si loss(ppm) and wear depth. The brands studied were Heliomolar flow, Filtek supreme. Point4, Tetric flow. The results were as follows: 1. The sequence of the mass loss was in descending order by Heliomolar flow, Filtek supreme, Point4, Tetric flow. There was significant differences among the materials except Heliomolar flow and Filtek supreme. 2. The sequence of the degree of degradation layer depth was in descending order by Filtek supreme, Heliomolar flow, Tetric flow, Point4. There were significant differences among the materials except Heliomolar flow and Tetric flow. 3. The sequence of Si loss was in descending order by Filtek supreme, Heliomolar flow, Point4, Tetric flow. There were significant differences among the materials except Point 4 and Tetric flow. 4. The sequence of maximum wear depth was in descending order by Heliomolar flow, Point4, Filtek supreme, Tetric flow and there was increasing wear depth on soaking in 0.1N NaOH solution. 5. When observed with SEM, destruction of bonding between matrix and filler was observed and when observed with CLSM, the depth of degradation layer of specimen surface was observed. There results indicate that wear and hydrolytic degradation could be considered to be evaluation factors of composite resins.

구속된 고강도 콘크리트 기둥의 휨 거동에 관한 실험적 연구

양근혁,이영호,곽노현,정헌수 중앙대학교 기술과학연구소 1998 기술과학연구소 논문집 Vol.28 No.-

본 실험적 연구의 목적은 콘크리트 강도, 띠근 배근형태, 띠근 량, 축하중비가 축하증과 횡하증을 받는 구속된 콘크리트 기둥의 휨 내력과 연성에 미치는 영향을 팡가하기 위한 것이다. 구속된 기둥의 휨 거동을 시험하기 위하여 200×200×800mm 크기의 시험체 14개를 2축 하중하에서 실험하였다. 시험결과로서, 저축력에서 콘크리트 구속으로 인한 휨 강도의 증가는 비교적 작게 있지만, 고축력에서 콘크리트 구속으로 인한 휨 강도 증가는 크게 있다. 그리고, 고축력, 고강도 콘크리트에서 내부 cross-ties가 있으면 휨 연성의 증가가 보였으며, 구속된 콘크리트 기둥의 연성은 단순한 띠근 량보다는 구속지수에 관계되었다. The purpose of this experimental study was to investigate the effects of concrete strength, the configuration of lateral ties, the amount of lateral ties, and level of axial loads on flexural strength and ductility of confined of reinforced concrete columns subjected to combined axial and lateral loads. To simulate the flexural behavior of confined columns, fourteen reinforced concrete columns, 200×200×800mm, were tested under bi-axial loads. Test results indicate that for low axial load levels, the enhancement of the flexural strength due to concrete confinement is relatively small, but that for high axial load levels, the enhancement of the flexural strength due to concrete confinement can be very high. Considerable enhancement of ductility was observed in columns confined by cross-ties, even for high strength concrete columns and under high axial loads. Ductility of confined columns are found to be more related to confinement index (ρ??f??/??) than the amount of lateral ties(ρ??)

상계치 이론을 이용한 장방형 개구부를 갖는 철근콘크리트 깊은 보의 전단내력 평가

양근혁,이영호,은희창,정헌수 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

The purpose of this study is to evaluate the failure plane and the shear capacity of reinforced concrete deep beams with rectangular openings using upper bound theorem. A numerical optimization procedure programmed to obtain the minimum value of the shear capacity by adjusting the position of the instantaneous center according to various potential failure planes. The predictions obtained from the proposed method are in good agreement with experimental results.

지식기반 사회에서의 정보민주주의와 정보복지 정책 : 정보편중 및 과독점 해소방안 A Solution for the Digital Divide

양승목,송호근,조권중 서울대학교 사회과학연구원 2002 한국사회과학 Vol.24 No.1

본 연구는 지식기반 사회에서 나타나고 있는 정보의 편중과 과독점을 정보격차 내지는 정보 불평등의 문제로 인식하고, 정보민주주의와 정보복지라는 두 가지 이론적 논의를 바탕으로 지식기반 사회의 정보격차와 정보불평등을 극복하는 정책적 대안을 모색하고자 하였다. 이를 위해 먼저, 정보격차를 야기하는 사회적 기제를 논의하고 각종 사회조사 통계의 분석을 통해 정보격차의 현황을 검토하였다. 그리고 정보격차를 극복하기 위한 노력의 이론적 근거로서 정보민주주의와 정보복지 개념을 논의하고, 국내외의 정보격차 해소 정책에 대한 사례연구를 실시하였다 그 결과, 정보격차와 정보불평등을 해소하려는 기존의 노력들은 주로 하드웨어든 소프트웨어든 정보통신기술에 대한 접근과 그것을 사용할 수 있는 능력의 배양에 초점을 맞추어 왔음을 알 수 있다 이러한 노력들이 나름대로 충분히 의미있고 또 중요한 것이지만, 정보격차를 궁극적으로 해결하기 위해서는 단순히 물리적 접근을 보장하는 차원이 아니라 정보불평등을 야기하는 사회 구조적 문제를 직시하고 정보사회에서의 사회적 삶의 가치를 중시하는 새로운 형태의 정책방안이 필요하다. This study examines the theoretical implications of 'information democracy' and 'information welfare' in the context of the rapid development of Information and Communication Technologies ICTs), and suggests policies to overcome the digital divide or information inequality between information rich and poor. Based upon an extensive survey of social statistics and the various policies implemented in Korea, the United States, and the United Kingdom, this study argues that the previous efforts to prevent the digital divide are limited because they have focused on broadening access to ICT hardware and software and providing widely available basic training in their use. As important and welcome as these efforts, we suggest the policies that move beyond a concern with physical access to ICTs, paying more attention to the structural aspect of information inequality as well as the value of social life in the age of information society.

개구부 폭과 깊이 변화에 따른 철근콘크리트 깊은 보의 파괴모드 및 내력 평가에 관한 연구

양근혁,이영호,은희창,정헌수 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

The purpose of this study is to investigate the failure mode and the shear strength of reinforced concrete deep beams with rectangular openings. Fourteen deep beams which shear span-to-depth ratio(a/h) is 0.5 were tested and an equation to predict the ultimate shear strength of deep beams with rectangular openings was established by the test results.

음낭내 낭포성 림프관종 1례

양근호,김홍주,김기환 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.4

Cystic lymphangiomas are congenital lymphatic hamartomas of which half are present at birth, 90% are evident by age 2 years and 95% occur in the neck or axilla. Scrotal cystic lymphangioma is rare with approximately 50 cases reported. The lesion is commonly misdiagnosed as hernia. hydrocele, spermatocele and acute scrotal condition, resulting in improper selection of incision, incomplete excision and recurrence, We present a case of 2 year 9 month old male with the scrotal lymphangioma that have not any connection with the testis or spermatic cord.

이상와 누공(piriform sinus fistula)에 기인한 재발성 화농성 갑상선염 1예 : A Route of Infection in Recurrent Suppurative Thyroiditis

양근호,김홍주,김기환 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.4

Piriform sinus fistula, believed as an embryonic remnant of the third or forth pharyngeal pouch, is an extremely rare and newly recognized entity that lead to acute suppurative cervical infection. Recently, reports of acute suppurative thyroiditis and anterior neck abscess due to piriform sinus fistula have been increasing in number, though an extensive review of the literature reveals that about 60 cases of this condition have been reported. The sinus may be overlooked for years and the patient may undergo multiple procedures before the diagnosis is properly made and treated. We have experienced such a case of recurrent suppuative thyroidits in which coexisting piriform sinus fistula was identified by intra-operative endoscopic examinaton. This report reviews the embryological development of the sinus and the clinical symptoms and treatment of this condition.

아지드화 나트륨과 고분자 혼합물의 안정성에 관한 연구

박근호,양영학 國立 昌原大學校 産業技術硏究所 2000 産技硏論文集 Vol.14 No.-

Sodium azide(SA) is commonly used as propellant for inflating automatic safety bags and other chemical manufacturing purposes. The investigation of potentially thermal hazard of sodium azide and its mixture with polymers are very important because it can occur an expected traffic accident so we took a experiments using DSC(different scanning calorimeter) in nitrogen atmosphere. The decomposition temperature were about 350℃∼450℃. We could find not only exothermic reaction was remarkably decreased in mixtures of ABS and PVC, but also increasing mixed rate of acrylonitnile butadiene styrene(ABS), polyvinyl alcohol(PVA) and polymethyl methacrylate(PMMA) decreased thermal decomposition heat.

III급 부정교합 어린이의 수완부 골성숙과 하악 3대구치 발육에 대한 연구

강근영,양규호,최남기,김선미 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.2

본 연구는 I급 부정교합과 III급 부정교합 어린이의 수완부 골성숙 단계와 하악 제3대구치 발육을 비교 · 평가하고자 하였다. 이를 위해 전남대학교병원 소아치과에 내원한 환자들로 8세부터 15세 사이의 Angle I급 부정교합을 지난 남자 149명,여자 155명 그리고 Angle III급 부정교합을 지닌 남자 153명,여자 155명,총 612명을 대상으로 하였으며 골성숙 단계 평가를 위해 수완부 사진을 이용한 Fishman의 방법을 사용하였고 하악 제3대구치의 발육 단계를 평가하기 위해 Orthopantomogram을 이용한 Gat 등의 New Six-Developmental-Stage 방법으로 판독하여 다음과 같은 결과를 얻었다. 1. 골성숙 단계는 I급 부정교합과 III급 부정교합군 모두 전반적으로 여자가 남자보다 빠르나(p<O.05) 하악 제3대구치의 석회화 단계는 성별 차이가 없었다. 2. 남녀별 골성숙 단계와 하악 제3대구치의 석회화 단계는 I급과 III급 부정교합군 간에서 유의한 차이가 없었다. 3. I급 부정교합과 III급 부정교합군의 수완부 골성숙 단계와 하악 제3대구치 석회화 단계 사이의 상관관계는 두 군 모두 높은 상관성을 보였다(p<O.O1). 4. I급 부정교합과 III급 부정교합군의 하악 제3대구치 석회화 단계와 연령사이의 상관관계는 두 군 모두 높은 상관성을 보였다(p<O.O1). 이상의 결과로 수완부 골성숙도와 하악 제3대구치 발육은 I급 부정교합과 III급 부정교합군 간에 차이가 없었다. The purpose of this study was to investigate the relationship of the skeletal maturity of hand-wrist and the development of mandibular third molar in subjects with class I and class III malocclusion. The subjects used in this study were 304 children(149 boys, 155 girls) with class I malocclusions and 308 children(153 boys, 155 girls) with class III malocclusions, ranged from 8 to 15 years of age. Hand-wrist radiographs and panoramic radiographs were used to evaluate the stage of skeletal maturity and teeth development. Fishman s method for the skeletal maturity stages of the hand-wrist and new six-developmental-stage method for the calcification stages of mandibular third molars were analyzed. The results were as follows: 1. In subjects with class I and class III malocclusion, skeletal maturity of the hand-wrist occured earlier in females than in ma1es(p<0.05), while the calcification stages of mandibular third molars were no significant gender differences. 2. There were no significant differences between the groups, when comparing the skeletal maturity stages of the hand-wrist and the calcification stages of mandibular third molars between subjects with the class I and the class III malocclusion. 3. The correlation coefficients between the calcification stages of mandibular third molars and the skeletal maturity stages of the hand-wrist in subjects with class I and class III malocclusion showed a high interrelationship(p<0.01). 4. The correlation coefficients between the calcification stages of mandibular third molars and chronological age in subjects with class I and class III malocclusion showed a high interrelationship (p<0.01). As a result, there were no significant differences between class I and class III malocclusion group for skeletal maturity of the hand-wrist and third molar development.