수동식 렌즈미터의 새로운 디자인 개발 연구

김형근, 지택상 김천대학교 2004 김천대학교 논문집 Vol.25 No.-

This device is suitable for spectacles measurement detection depart-ment, spectacles processing factories, spectacles sales department, departments of ophthalmology in hospitals and different kinds of spheri-cal lens This study is for designing lens meters' as a project of manufacturing a new style lens meter. The design of a new lens meter is done by collecting informations about lens meter markets, and new ideas, drawing a number of idea sketches to hear the opinions of the clients through presentations. To level up the idea sketch step by step, it is needed to get a feedback of the clients idea by presentations. We could finish this design for the new style of lens meter by three months of processing through several steps.

IMS 시스템을 위한 미들웨어의 연구

김형중,박태열,김기택 강원대학교 석재복합신소재제품연구센터 1998 석재연 논문집 Vol.3 No.-

지능생산시스템은 분산화되고 Fieldbus, LAN 등의 지역통신망과 ATM, 인터넷 등의 광역통신망도 이용한다. 서로 다른 오퍼레이팅 시스템과 다양한 통신 프로토콜을 사용할 경우 지능생산시스템에 요구되는 중요한 기능 중 하나가 플랫폼 독립 특성이다. 이런 요구를 만족하기 위하여 특별한 규약을 따를 필요가 있으며 이러한 규약에는 OMG(Object Management Group)에서 규정한 CORBA(Common Object Request Broker Architecture)가 있다. 본 연구에서는 Orbix와 Visual C++을 이용하여 IMS에 적합한 소프트웨어 환경인 생산 셀과 지능생산시스템을 모의하는 소프트웨어를 구현하였다. IMS 시스템을 CORBA로 통합하기 위하여 Orbix를 PC 환경에서 IDL(Interface Description Language) 언어로 작성하고 이를 Visual C++을 이용하여 시스템을 구성하였다. IMS(Intelligent Manufacturing System) can be characterized by a distributed manufacturing system based on local or wide area networks such as fieldbus, ATM, and the internet. Most important characteristics required are platform-independent and interoperable between different operating systems and/or communication protocols. CORBA suggested by OMG can meet the requirements. In this study, software programs using Orbix IDL and Visual C++ on PC environment are implemented, which simulate manufacturing cells and IMS.

고온·고압 처리한 키토산을 이용한 수중의 납 제거에 관한 연구

김동석,이승원,우형택 한국환경과학회 2003 한국환경과학회지 Vol.12 No.12

In order to know the effect of autoclaving on the heavy metal removal using chitosan, lead removal capacities and removal rates by various chitosans in aqueous solution were compared according to the various autoclaving time. The lead removal efficiencies and removal rates by the autoclaved chitosan were found to be on the order of 15 min(98%) > 10 min(95%) > 30 min(83%) > 5 min(53%) > 60 min(47%) > 0 min(22%) chitosan. The molecular weight of chitosan was decreased by the increase of autoclaving time. Therefore, the heavy metal removal capacity was not well correlated to the molecular weight. Langmuir isotherm was well fitted to experimental results of equilibrium adsorption on chitosan. In order to examine the process of lead removal by the autoclaved chitosan, TEMs, SEMs and FT-IR analyses were used. The surface of autoclaved chitosan was much more porous and the lead removal was mainly occurred on the surface of chitosan. The structure of autoclaved chitosan was same as that of controlled chitosan.

자원봉사자들의 탈북자 지원 경험 분석 : 설문결과를 중심으로

강성록,김형중,윤덕룡,전우택,민성길 연세대학교 통일연구원 2001 통일연구 Vol.5 No.1

Objectives: Since 1994, the number of North Korean defectors, escaping North Korea and entering South Korea, has in creased rapidly.The Government has provided most of te support for the defectors' adaptation to their new society.But as the number of defectors has increased, and the support needs have become more various, the support of volunteers from non-governmental organization(NGO) has become very important.To raise the level of the success and effectiveness of the support from the volunteers, their experiences were surveyed and analyzed. Methods: This study surveyed 83 volunteers of 7 NGOs involved in helping North Korean defectors' adaptation to South Korean society-48 men and 34 women. Results: In their relationships with defectors, women volunteers have more difficulties in their first 3 months.However volunteers in their 50s and 60s tend to have more stable and better relationships with defectors than younger volunteers.Many volunteers statedexperiences of human difficulties with defectors, for example, mistrust and anxiety in human relationship (n=34, 41.0%), psychological maladjustment(n=19, 22.9%), different ways of thinking and culture(n=17, 20.5%), economic difficulties(n=10, 12.0%), and lack of independence spirit(n=6, 7.2%).The volunteers said they have feelings of goddwill toward defectors when defectors showed warm heart(n=30, 36.1%), politeness(n=30, 36.1%), positive and active character (n=24, 28.9%), strong will(n=17, 20.5%), and plainness (n=14, 16.0%).The volunteers stated an absence of goodwill feelings to defectors when defectors showed uncompromising and aggressive attitudes (n=29, 34.9%), lack of independent will (n=28, 33.7%), selfishness (n=18, 21.7%), and avoidance of making human relationship (n=16, 19.3%).as for adequate training before commencing activity, 5 volunteers(6.0%) said they had received enough education before their activity, 31(37.3%) relatively enough, 38 (45.8%) relatively not enough, and 9 (10.8%) absolutely not enough education.If they were the owners of al company, 27 volunteers (51.9%) sanid they would want to thire defectors even if the defectors did not have the required ability. Conclusion: These results showed that NGO's volunteers have a friendlier attitude to defectors than policemen n charge and public officials, which is their strong point.Women volunteers experience more difficulties in their early relationships with defectors, suggesting the need for a specific pre-education program for women volunteers.Furthermore, NGOs would benefit from an increase in the number of volunteers in their 50's and 60's.Both volunteers and defectors need to understand each othe to a deeprer extent and the characteristics to which South Korean volunteers feel goodwill need to be used n their education.

S. cerevisiae와 A. pullulans를 이용한 수용액 중의 납 제거에서 온도와 pH의 영향

김동석,서정호,우형택,송승구 대구효성가톨릭대학교 응용과학연구소 1997 응용과학연구논문집 Vol.6 No.1

The environmental factors, temperature and pH, were controlled to investigate the effects on the removal of lead in the solution by S. cerevisiae and A. pullulans. The range of experimental temperature was 20℃∼50℃, and that of Ph was 2.5∼6.5 and 2.5∼12, respectively. The optimum temperature of S. cerevisiae and A. pullulans in the removal of lead was 30℃ and 40℃, respectively. And the initial removal rate of lead by, S. cerevisiae was increased according to the increase of temperatue. The variation of the amounts of lead removal by S. cerevisiae according to the variation of temperature was steeper that by A. pullulans. The optimum pH condition was existed on both of the microorganisms, S. cerevisiae and A. pullulans, in our experimental range and that is 4.5 and 9.0, respectively.

핵에너지 태도의 사회 그룹별 특성과 변수

김지은,우형택 한국환경과학회 2004 한국환경과학회지 Vol.13 No.10

This study was conducted to find and explain characteristics of diverse social groups' attitudes toward nuclear power plant. 7 hypotheses were constructed and statistically tested. In order to test 7 hypotheses, both Nuclear Energy Attitude Scale and Environmental Attitude Scale were distributed and field surveyed on 839 respondents representing a diverse range of subject groups. The results showed that 6 hypotheses were statistically accepted while 1 hypothesis statistically rejected. Contrary to the first hypothesis, this test found that people in close proximity to the nuclear power plant had more positive attitudes toward nuclear power than those living in distance from the nuclear power plant. Males had more positive nuclear energy attitudes than females. Academic backgrounds were not related to nuclear energy attitudes. Environmental attitudes showed negative relationship with nuclear energy attitudes. While anti-nuclear citizen action groups had the most negative attitudes, nuclear power plant workers had the most positive attitudes among responding groups. Finally, university students majoring in nuclear engineering had more positive attitudes than those of religious studies.

Ti-Ag 합금의 인공타액 내에서의 전기화학적 특성

심형민,오근택,김경남 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.4

Titanium and its alloys are widely used in biomedical and dental fieds because of their excellent corrosion resistance, biocompatibility, high strength to weight ratio and good fatigue properties. It is well known that titanium is protected from corrosion due to the stability of passive film that controls and determines the corrosion resistance of titanium. The stability of passive film can also determine biocompatibility of titanium and its alloys. The purpose of this study was to evaluate the electrochomical properties of Ti-Ag alloys and the stavility of passive film in artificial saliva. We designed Ti-Ag alloys with silver contents ranging from zero to 5.0 at% in steps of 0.5 at%. The alloys were arc-melted, homogenized, hot-rolled to 2 mm in thickness, and finally solution heat-treated for 1hour and quenched in water. Potentiodynamic and poteniostatic testing were performed and open circuit potential of the Ti-Ag alloys was measured in artificial saliva 37℃. Passive film of the Ti-Ag alloys was analyzed by XPS(x-ray photoelectron spectroscopy). Ti-Ag alloys showed low passive current density and electrochemically stable behavior in the artificial saliva and passive film of the Ti-Ag alloys was composed of TiO_2, Ti_2O_3 and TiO. As Ag content increased, TiO_2 fraction increased and titanium oxide layer of the Ti-Ag alloys formedthicker than that of titanium.It is thought that Ti-Ag alloys can be adopted and used safely with good biocompatibility for dental application.

치과 재료용 NiTi 합금의 특성에 대한 Ag 첨가의 영향

오근택,박기호,심형민,황충주,김경남 大韓齒科器材學會 2001 대한치과재료학회지 Vol.28 No.4

Equiatomic and near-equiatomic nickel-titanium alloys have shape memory effect and superelasticity. However nickel-titanium alloys are extremely sensitive to the precise nickel-titanium ratio and alloying additions. There are many reports on the alloying additions such as Fe, Al, Cr, Co, V, Pt, Pd, Zr, Hf, Nb and Cu. The purpose of this study was to investigate the effect of silver addition to nickel-titanium alloy for dental and medical application.Arc melting process was used to fabricate nickel-titanium alloys. The casts were heat-treated in a vacuum furnace at 950℃ for 72 hours to homogenize their composition. Subsequently, they were hot-rolled at 950℃ to obtain the plate samples and annealed in a vacuum furnace at 950℃. To investigate the properties of nickel-titanium alloys, phases, transformation temperature, compositions, corrosion resistance and hardness were evaluated using X-ray diffractometer, differential scanning calorimeter, energy dispersive spectroscopy or atomic absorption spectroscopy, potentiostat and micro-vickers hardness tester, respectively. NiTiAg alloys showed the low silver recovery rate for the cast due to its low evaporation temperature, and showed low silver solubility to NiTi alloy. Silver addition to NiTi alloy increased transition temperature range (TTR) above 100℃ and stabilized martensitic phase(monoclinic structure) at room temperature because Ms temperature was above room temperature. Martensitic and austenitic phase existed in x-ray diffraction pattern of solution annealed NiTiAg alloys. The Silver addition is considered to improve corrosion resistance and change largely the mechanical properties depending upon the amount of alloying addition and types of addition elements.

만성 신부전증 환자의 중중 고혈당에 따른 의식 변화 결정에 대한 연구

위형중,이창범,박성광,강성귀,임천규,박은주,윤경택,한상웅,안유헌,김호중· 대한신장학회 2000 대한신장학회잡지 Vol.19 No.6

복합적인 레지스트 패턴 붕괴현장의 역학적 해석

이형주,박준택,안일신,김옥근,오혜근 한양대학교 이학기술연구소 2003 이학기술연구지 Vol.6 No.-

패턴의 선폭이 100nm이하로 작아짐에 따라 패턴이 부러지고, 휘고, 떨어져 나가는 현상이 발생하는데 이러한 현상을 패턴 붕괴 현상이라고 하며, 반도체 생산과 수율에 많은 영향을 미친다. 패턴 붕괴 현상은 리소그래피 과정 중 현상 후 세척액을 건조하는 과정에서 주로 발생하며 세척액의 표면장력에 의한 모세관 현상이 주된 원인으로 알려져 있다. 패턴 붕괴 현상을 시뮬레이션하기 위하여 패턴이 세척액에 의해서 균일한 압력을 받을 때와 집중 압력을 받을 때의 역학적 모델을 세우기 각각의 모델을 통하여 선폭과 패턴간의 거리에 따른 임계 높이/선폭비 (aspect ratio) 를 계산하여 실제 실험 결과와 일치하는 모델을 선정하였다. 또한 패턴 내부에 생기는 stress 에 의한 부러짐 현상과 패턴 과 레지스트 패턴 하부 층 사이의 접착력 부족으로 발생하는 떨어짐 현상을 해석하였다. High aspect ratio resist patterns with dimensions below 100 nm often bend, break or tear. These phenomena are generically called "resist pattern collapse". Pattern collapse is a very serious problem in fine patterning of less than 100 nm critical dimension (CD), so that it decreases the yield. In order to mechanically analyze this phenomenon and create its simulator, two models have been made and compared. In this paper, various approaches with various analyses are made to understand pattern collapse. Also, the critical aspect ratio for 100 nm node, that determines whether pattern collapse happens or not, can be calculated with these approaches. Finally, tear type caused by insufficiency of adhesion strength between the substrate and the resist is analyzed with a point of view of the surface free energy.