김 서림 방지 렌즈코팅의 내구성 시험 방법 개발

강성구,황병찬,하광,황지홍 한국생산제조학회 2022 한국생산제조학회지 Vol.31 No.3

Recently, the interest in technologies for anti-fog lens coating has increased, owing to the inconvenience of lens fog occurrence while wearing a mask daily or at work. Consequently, many ocular products with anti-fog capability have been introduced into the market. However, their durability is poor or not specified, owing to the absence of a test method or standard for evaluating the durability of anti-fog coatings. In this study, a test method for evaluating the durability of anti-fog coating for lenses was proposed. The proposed method combines the durability test for anti-reflective coatings for lenses and the test for resistance to ocular fogging. The test results obtained for different coated lenses using the proposed method indicate that this method effectively evaluates anti-fog coating durability.

배양한 신생돼지 췌관세포의 증식 및 분화

강성구,서선희,이광우,손호영,손현식,강무일,한제호,유순집,차봉연,고승현,안유배,윤건호,송기호 대한당뇨병학회 2000 Diabetes and Metabolism Journal Vol.24 No.3

Background: Neonatal porcine pancreas is an attractive alternative source for islet transplantation because of its growth potential and availability. Porcine neonatal pancreatic cell clusters(NPCCs) consist mainly of protodifferentiated cells expressing both the duct cell marker pancytokeratin and islet hormones. In this study, we investigated to expand and mature the pancreas duct cells contained in porcine NPCCs with extracellular matrix. Methods: For NPCCs, pancreas obtained from neonatal pigs were minced, digested with collagenase and cultured overnight, Then NPCCs were further disparsed to small cell groups and cultured on HTB-9 extracellular matrix: the tissue attached and formed monolayer patches. At the 3rd and 8th days, tissue was fixed, immunostained for pancytokeratin (panCK), vimentin (VT) and islet hormones. Results: During 5 days culture, the total cell numbers increased 3.2 fold on the matrix, and 1.6 fold on the sticky dish, respectively. Insulin positive cells (Ins+) were 6.0% of total cells at day 3 and increased 1.6 fold in nurnbers at day 8. There was significant increase in DNA content of NPCCs in monolayers on both sticky dishes and HTB-9 matrix. In contrast, insulin content of both groups decreased during culture periods. Until 8 days of culture affer dispersion of porcine NPCC, most duct cells costained with panCK and VT. Conclusion: We observed NPCCs were composed of many of duct cells which were known to be endocrine precursor cells and monolayer culture of NPCC with extracellular matrix resulted in the proliferation and differentiation of pancreatic duct cells

피로골절환자에서 골주사 소견과 방사선 소견의 비교

강성구,김소연,고광섭,이권전,김재영 대한핵의학회 1987 핵의학 분자영상 Vol.21 No.1

The stress fracture is a disease caused by and abnormal stress to the normal bone with constant, repeated pull. Early detection of stress fracture plays an important role in treatment and prevention of its complication. Bone scintigraphy was performed to evaluate 18 patients with stress fracture of the lower extremities from May, 1985 to April, 1987, in the Department of Internal Medicine of National Police Hospital. The results were as follows: 1) Seventeen of the 18 cases showed positive bone scans at the initial study performed from 1 week to 5 months after the onset of symtom. 2) Ten of the18 patients had findings of stress fracture at the initial X-ray film. Two out of 8 negative case revealed positive findings in the follow-up studies. 3) The bone scans in the 2 cases taken 5 months after the onset of symtom; the one showed only slightly increased radiouptake, the other showed no abnormal findings. In conclusion, bone scanning is a more sensitive indicator of early stress fracture than radiologic study, The healing phase is characterized by a gradual decline in radioactivity at the fracture site in concordance with subsidence of symptom.

폐쇄성 수면 무호흡 환자에서 비수술적 체중 감량 치료 전・후의 주간 졸림증 및 피로도 변화

강성구,김세홍,박서진,김하나,박용진,송상욱 대한비만학회 2011 The Korean journal of obesity Vol.20 No.4

연구배경: 비만으로 생길 수 있는 합병증은 다양한데, 특히 호흡기계 합병증으로 가장 흔하게 볼 수 있는 것이수면 중 상기도 폐쇄로 인한 증상, 즉 코골이이고, 이것이 지속될 경우 수면 무호흡증으로 이어질 수 있다. 이번연구에서 폐쇄성 수면 무호흡 환자에서 비 수술적 체중 감량을 통한 주간 졸림증, 피로도 개선 양상 및 동맥 경화도와 활성 산소, 항산화능력의 변화 여부를 살펴보고자 한다. 방법: 이비인후과에서 폐쇄성 수면 무호흡증으로 진단되어 체중 감량을 위해 의뢰된 21명의 성인을 대상으로 12주간의 비 수술적 체중 감량 치료를 시행하였다. 식이 요법과 운동 요법을 기본으로 하여 약제가 필요하다고 판단될 경우 약물 요법(orlistat, XenicalⓇ 또는 Sibutramine, ReductilⓇ)을 시행하였다. 치료 전, 후의 주간 졸림증의 평가는 ESS (Epworth Sleepiness Scale)로, 피로도 평가는 FSS (Fatigue Severity Scale)로 평가하였고, 그 외 동맥경직도, 활성 산소 및 항산화력을 측정하여 비교하였다. 결과: 본 연구에 참여한 환자들에 대한 체중 감량 치료 12주 후, 1~12.9 kg까지(원래 체중의 1.5~14.2% 감량)대부분 체중 감량이 이루어졌다. 체중 감량 치료 후 ESS는 치료 전에 비해 유의하게 개선되었으며(치료 전 9.42 ±3.78, 치료 후 5.67 ± 3.77, P = 0.001), FSS 역시 치료 전에 비해 치료 후 유의하게 감소되었다.(치료 전 3.42 ±1.59, 치료 후 2.52 ± 1.10, P = 0.041) 동맥 경직도 및 활성산소, 항산화력은 치료 전과 후에 차이를 보이지 않았다. 결론: 본 연구를 통해 폐쇄성 수면 무호흡을 호소하는 환자에서 12주간의 비수술적 체중 감량 치료를 통해 주간졸림증 및 피로도 개선을 확인 할 수 있었다. 추후 활성산소나 항산화력, 동맥 경직도의 치료 전, 후의 변화 등에대한 추가적인 연구가 필요할 것으로 생각된다.

근원세포 분화조절 유전자의 클로닝

강성구,이채관,김상해,김정락 인제대학교 1992 仁濟論叢 Vol.8 No.2

배아의 근원세포는 분화가 진행 됨에 따라 성체의 골격근 세포로 된다. 이러한 분화단계에는 특정 유전자가 관여할 것으로 추정되며 이전 실험에서 0.8Kb의 cDNA를 확인하였다 (Kang et al., 1992). 이러한 특이 유전자는 계배 부화 9일째부터 발현이 되었으며 성체에서는 발현이 되지 않았다. 특히 12일과 14일 계배의 뇌,간,신장조직에서는 유전자 발현이 되지 알았으며 단지 가슴근육조직에서만 유전자 발현이 되었다. 이 유전자는 계배 골격근 세포의 분화에서 중요한 역할을 할 것으로 추정된다. Embryonic myoblasts become determined to differentiate into distinctive types of muscle cells. Skeletal muscle cell is one of them. We studied the expression of muscle specific 0.8Kb cDNA related to the differentiation of chick embryonic myoblast in various stage of development and in organs. The gene was expressed from 9 day old chick embryo stage, but was not expressed at adult breast muscle. Also the gene was not expressed in brain, liber, kidney but expressed in 12 and 14 day old chick embryonic breast muscle. Therefore, this muscle specific gene(0.8Kb) may have an important role in regulating the diffrentiation of chick embryonic myoblast.

생활도우미활동이 장애학생에 대한 일반학생의 또래관계에 미치는 영향

강성구 국립특수교육원 2005 특수교육연구 Vol.12 No.2

이 연구는 일반중학교에서 장애학생의 학급생활을 돕기 우해 활용되어지고 있는 생활도우미 활동이 장애 학생에 대한 일반학생의 또래관계에 미치는 영향에 대해 알아보고자 하는 데 목적이 있다. 이를 위해 통합교육을 실시하고 있는 일반중학교 1개교(208명)를 대상으로 학급배치요인(장애학생과 같은 반/다른 반)과 또래관계개입요인(개입 유/무)을 기준으로 집단을 구분하고, 또래관계 질문지를 통해 또래관계를 전체 점수와 하위 점수(공유활동, 친사회적행동, 친밀감, 애착ㆍ자존심ㆍ고양, 신의, 갈등)로 환산하여 각 집단 간 차이를 분석하였다. 연구 결과는 1. 학급배치요인(physical proximity)은 일반학생과 장애학생의 친밀감을 감소시키지만 갈등도 감소시켰다. 그 효과는 미미하다. 2. 또래관계개입요인(peer-relationship intervention)은 일반학생과 장애학생의 또래관계에서 갈등을 제외한 대부분 영역에서 또래관계 점수를 높여주었다. 3. 또래관계점수는 학년에 영향을 받았고, 상호작용효과는 학년과 학급배치요인 간에 두드러졌다. 그러나 또래관계 점수는 성별에는 영향 받지 않았다. 따라서 통합교육환경에서 단순히 학급배치만을 고려하는 것은 장애학생과 일반학생의 또래관계개선에 큰 도움이 되지 못했다. 그렇지만 생활도우미활동을 실시했을 때 또래관계개입을 함께 고려하면 또래관계를 개선하는데 큰 도움이 된다는 결론을 내릴 수 있었다. The objects of this study is to find the effects of Peer helper activity which are related with the non-disable student's peer relationship with disable student. I took sampling 208 students who went to N School which progress peer-helper activity, surveying and analyzing it according to proximity, peer relationship intervention, grade, sex. The peer-helper activity effects remarkably on non-disable student's peer relationship with disable student. However, there is some question in building up the in creasing non-disable student's peer relationship with disable student which is only peer-relationship intervention. The remarkably peer-helper activity's effects is peer-relationship intervention and a chance which interact with disable students. and The grade interacts significantly with Physical proximity and has main effects but, The sex does not interact significantly with any ones and does not have main effects. Come to the Conclusion that activity which is only refer to proximity is not helpful to non-disable student's peer relationship with disable student but that activity which is refer to both Physical proximity and peer-relationship intervention is helpful to non-disable student's peer relationship with disable student.

자기베어링시스템 강성의 실험적 고찰을 통한 안정화 특성에 관한 연구

강성구,강종규,홍준희 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

Due to the lack of stiffness and difficulties of control, it is hard to achieve well balanced magnetic levitation. In this paper, we analysis the current and position stiffness change according to bias current through experiment. Then, compensation equations were presented. After obtaining PD gain for each bias current and PD gain region through levitation experiment, we consider the characteristics.

기조연설 : “더 좋은 放送을 위하여”

姜成求 한국방송학회 1993 한국방송학회 세미나 및 보고서 Vol.- No.-

Fe^(3+)-Thiourea Redox 계에서 Nylon 66에 Vinyl계 Monomer의 Graft 공중합에 관한 연구(第1報) : Methyl methacrylate의 graft 공중합

강성구,권순채 영남이공대학 1982 論文集 Vol.11 No.-

The graft copolymerization of methylmethacrylate onto nylon 6.6 fibers was investigated in aqueous solution using the ferric chloride - thiourea redox system as the initiator. The rate of grafting was determined by varying the monomer, initiator, and thiourea, the acidity of the medium. The graft yield increases with increasing the initiator concentration up to 2.0×10^-3M/L and thereafter it slows down. The rate of grafting increases with on increase of thiourea concentration. The percentage of grafting increases with on increase of the monomer concentration.

Development of method to remove weld scallop and ceramic backing material of wedge type and its application

강성구,양종수,김호경 대한조선학회 2015 International Journal of Naval Architecture and Oc Vol.7 No.2

The weld scallop has been used for joining T-bars. There are a lot of weld scallops in shipbuilding. It is difficult to perform scallop welding due to the inconvenient welding position. This results in many problems such as porosity, slag inclusion, etc. In this study, a new method is devised to remove weld scallops by incorporating a Ceramic Backing Material (CBM). The weld scallop is removed by an elongation of the v groove. In order to insert a CBM into the groove without a weld scallop, a wedge-shaped CBM is developed. The top side of the developed CBM is similar to the shape of a general back bead. The bottom surface has a saw-toothed shape for cutting at a suitable length. This can be attached to the root side of a face plate using adhesive tape, just like a general CBM. Welding experiments in normal and abnormal conditions are carried out and the possibility of burn-through is examined. This CBM's applicability to shipbuilding is verified.