증기화 증폭시트를 적용한 전자빔 가공 특성 연구

김성현,정성택,김현정,백승엽,Kim, Seong Hyun,Jung, Sung Taek,Kim, Hyun Jeong,Baek, Seung Yub 한국금형공학회 2018 한국금형공학회지 Vol.12 No.2

Recently, as machine components and products are getting smaller, it is demanded to develop superprecision production technologies multilaterally. Along with the advancement of production technology, people are paying keener attention to the development of eco-friendly technology and efficient processing technology. Particularly, in many industries related to automobiles, shipbuilding, or airplane components, it is demanded to obtain technology to process multiple micro-holes. On account of this trend, micro-hole processing employing high-power electron beams is rising nowadays, and more interest is being shown in it, too. In Korea, however, the process of manufacturing vaporized amplification sheets influencing high-power electron beam processing technology and the processability considerably has not been developed sufficiently yet. Therefore, this study has applied vaporized amplification sheets manufactured to analyze the processability of high-power electron beams and examine necessity for vaporized amplification sheets.

치주치료 후 구강 내 Volatile Sulfur Compounds(VSC)의 변화

김성현,채경준,정의원,김창성,최성호,조규성,채중규,김종관,방은경,Kim, Sung-Hyun,Chae, Gyeong-Jun,Jung, Ui-Won,Kim, Chang-Sung,Choi, Seong-Ho,Cho, Kyoo-Sung,Chai, Jung-Kyu,Kim, Chong-Kwan,Bang, Eun-Gyeong 대한치주과학회 2006 Journal of Periodontal & Implant Science Vol.36 No.3

Oral malodor may cause a significant social or psychological handicap to those suffering from it. Oral malodor has been correlated with the concentration of volatile sulfur compounds (VSC) produced in the oral cavity. Specific bacteria identified in the production of VSC have been reported and many of these bacteria are commonly suspected periodontal pathogens. The aim of this study was to estimate the change of the VSC concentration after periodontal treatment, Twenty subjects with probing depth $(PD)\;{\geq}5mm$ (experimental group) and 20 subjects with PD<5mm (control group) participated. VSC concentration measurement was made with gas chromatography. VSC concentration was measured at pre-treatment, 2 weeks after scaling and 1 month after periodontal treatment(root planning and flap operation). Maximum probing depth and bleeding on probing(BOP) were also examed at pretreatment and 1 month after periodontal treatment, The conclusions were as follow: 1. In the experimental group VSC concentration and CH3SH/H2S ratio were higher than control group. (p<0.05) 2. Both VSC concentration and CH3SH/H2S ratio showed decrease after periodontal treatment, But only CH3SH/H2S ratio after 1 month periodontal treatment was statistically significantly different from pre-treatment. (p<0.05) 3. CH3SH/H2S ratio tended to be on increase according to maximum probing depth and bleeding on probing. Periodontal disease could be a factor that caused oral malodor and oral malodor could be decreased after periodontal treatment.

무연 0.74(Bi_0.5Na_0.5)TiO₃-0.26SrTiO₃ 압전 세라믹스의 하소온도 변화에 따른 전기적 특성 변화

김성현,이상훈,한형수,이재신,Kim, Seong-Hyun,Lee, Sang-Hun,Han, Hyoung-Su,Lee, Jae-Shin 한국전기전자재료학회 2019 전기전자재료학회논문지 Vol.32 No.1

In this study, we investigated the optimum calcination temperature of lead-free $0.74(Bi_{0.5}Na_{0.5})TiO_3-0.26SrTiO_3$(BNST) piezoelectric ceramics by analyzing the crystal structure, dielectric properties, and electric field-induced strain behavior. BNST ceramics prepared by conventional solid-state reaction methods at various calcination temperatures according to the industrial standard. All samples of BNST ceramics were subsequently sintered at $1,175^{\circ}C$ for 2 h. Crystal structure classification of the ceramics showed a single perovskite phase, with no second phase detectable for the samples calcined at $750^{\circ}C$ or higher. BNST samples calcined at $850^{\circ}C$ exhibited the most optimal values for itsand the common physical parameters of $density=5.518g/cm^3$, ${\varepsilon}=1,871.837$, $tan{\delta}=0.047$, and ${d_{33}}^*=874pm/V$.

세계은행과 거버넌스: 정책개혁 모델의 발명에 대한 소고

김성현 ( Seong Hyun Kim ) 한양대학교 제3섹터연구소 2012 시민사회와 NGO Vol.10 No.1

1980년대 말부터 세계은행은 자신의 신자유주의적 개혁프로그램에 대해 자성하고 국제기구, 정부, 시민단체가 참여하는 합의적 정책 결정 메커니즘, 즉 거버넌스의 중요성을 강조하고 있다. 본 연구는 세계은행에서 거버넌스 담론이 구성되는 과정을 전문성의 국제적 표준화를 둘러싼 학문공동체의 경쟁이라는 관점에서 설명한다. 즉 본 연구는 국제금융기관 혹은 국제개발 기구로서 세계은행의 역할만을 다루는 것이 아니라 것이 아니라 특정한 정책지식을 정당화하고 현실에 적용하는 일종의 "상징은행"으로서의 역할에도 주목한다. 개혁을 둘러싼 과학적인 경쟁은 순수한 전문가들의 게임으로 한정되지 않으며 과학의 장과 경제적 장, 그리고 정치권력의 장의 중첩과 교차로 구성되는 복합적인 장에서 수행된다. 이 상징권력자들은 국제기구의 관료, 경제학자, 금융계의 지도자, 시민운동부문의 엘리트 등이며 이처럼 복잡한 주주들이 만들어내는 거버넌스 담론은 도덕성과 과학성 나아가 경제성과 정치성을 모두 포함한 복합적인 투쟁의 결과물임을 보여준다. Since 1980s, The World Bank has been autocriticized its neoliberal reform programs and pushed ahead with governance, a kind of concensual decision-making mechanism around which international organizations, national governments, and NGOs. This study explains the construction of governance discourse of the Bank from the view of the competitions among scientific communities for the international standarization of expertise. That is to say, this study analyses not only the role of the Bank as an international development organization but also its role as a kind of "symbolic bank" which legitimize certain policy ideas and applied them to the real policies. The scientific competitions around policy reforms is not limited to professional games but they are conducted in a mixed fields constructed by scientific, economic, and political sub-fields. The symbolic power in this fields are the officials in the international organization, economists, high-profiled bankers, and the elites of civil society organizations and the governance discourse constructed by these stake-holders is the result from the moral, scientific, economic, and political struggles.

갈색거저리를 이용한 식사 섭취에 따른 영양 섭취 및 영양상태 변화 : 수술 후 환자를 대상으로

김성현 ( Seong Hyeon Kim ),손진영 ( Jin Young Shon ),박준성 ( Jun Sung Park ),김종원 ( Jong Won Kim ),강정현 ( Jung Hyun Kang ),윤은영 ( Eun Young Yun ),황재삼 ( Jae Sam Hwang ),김형미 ( Hyung Mi Kim ) 대한영양사협회 2016 대한영양사협회 학술지 Vol.22 No.4

The purpose of this study was to verify the validity of Mealworms as a hospital meal with increased nutrition density. We provided a meal for postoperative patients and conducted analysis of dietary intake and nutritional status of patients and assessment of acceptability of the meal. This study was carried out as a randomized control trial. Patients were supplied either a hospital meal using Mealworms (Experimental group) or a regular hospital meal (Control group). We investigated the administration amounts of parenteral nutrition (PN) and food intake of patients after surgery and measured anthropometry, body composition, and blood tests before surgery and at hospital discharge. We included 34 postoperative patients who were admitted to Gangnam Severance Hospital from March to September. In the groups of patients not supplied with PN, the experimental group (964.68±284.6 kcal, 38.82±12.9 g) had significantly higher dietary calorie and protein intake than the control group (666.62±153.7 kcal, 24.47±4.9 g)(P<0.05). Additionally in the group of patients not supplied with PN, the experimental group (1.37%) showed a significantly higher increase in fat free mass index than the control group (-3.46%)(P<0.05). In all subjects, calorie density and protein density were significantly higher in the experimental group (P<0.001), and acceptability of calorie (P=0.036) and protein (P=0.001) was also significantly higher in the experimental group. Therefore, the results of this study support the validity of the introduction of hospital meals using Mealworms.

빈곤감축전략보고서(PRSP), 아프리카 신자유주의와 시민사회

김성현 ( Seong Hyun Kim ) 한양대학교 제3섹터연구소 2014 시민사회와 NGO Vol.12 No.1

빈곤과 외채의 덫에 묶여있는 아프리카 국가들은 1980년대부터 외채경감이나 차관의 유치를 위해 국제금융공동체(특히 브레턴우즈 기관들)가 부과한 신자유주의적 구조조정 프로그램들을 받아들일 수밖에 없었다. 각종 규제의 철폐와 민영화, 시장개방에 초점을 맞춘 신자유주의 정책은 아프리카국가들의 성장동력을 고갈시키고 사회적 균형을 파괴했다. 또한 아프리카국가들의 외채문제는 개선되지 못했다. 1990년대 양극화의 심화와 빈곤의 악화, 신자유주의에 대한 범세계적인 저항운동, 빈번한 금융위기에 직면해 국제금융기구는 빈곤감축전략보고서라는 새로운 글로벌 처방을 제시하였다. 빈곤국가의 주체성, 참여민주주의, 시민의 권능강화를 목표로 한 새로운 발전노선은 그러나 아프리카 국가들에게 여전히 신자유주의적 구조조정을 강요하고 있으며 발전을 위한 원칙들은 지켜지지 않고 있다. 시민의 권능강화와 빈곤감축의 옷을 입은 신자유주의는 이제 경제의 영역을 넘어 정치사회의 영역 까지 급속하게 확대되고 있다. The African countries trapped by poverty and debts have been obliged to perform neoliberal structural adjustment by international financial community (especially Bretton Woods institutions) since 1980s. The neoliberal policies which promoted all sort of deregulations, privatizations, and opening the market exhausted developmental energies and destructed social equity in African nations. Moreover, the African debt problems couldn`t be solved at all. Faced with class polarization, aggravated debt burdens, anti-neoliberal movement on the global dimension, and frequented financial crisis, the international financial institutions invented new global prescription in the name of “poverty reduction strategic paper.” Although the new developmental programs spread such a gospel as national ownership, participatory democracy, and empowerment of citizen, they still impose neoliberal structural adjustment on the poor African countries and the principles for the development doesn`t respected. The neoliberalism, disguised as philanthropy and democracy, now enlarge its power beyond economic sector to socio-political spaces.

퍼지 신경망을 이용한 로보트 매니퓰레이터 제어

김성현(Seong-Hyun Kim),김용호(Yong-Ho Kim),심귀보(Kwee-Bo Sim),전홍태(Hong-Tae Jeon) 제어로봇시스템학회 1992 제어로봇시스템학회 국내학술대회 논문집 Vol.1 No.1

퍼지 신경망을 이용한 로보트 매니퓰레이터 제어

김성현(Seong-Hyun Kim),김용호(Yong-Ho Kim),심귀보(Kwee-Bo Sim),전홍태(Hong-Tae Jeon) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10

As an approach to design the intelligent controller, this paper proposes a new FNN(Fuzzy Neural Network) control method using the hybrid combination of fuzzy logic control and neural network. The proposed FNN controller has two important capabilites, namely, adaptation and learning. These functions are performed by the following process. Firstly, identification of the parameters and estimation of the states for the unknown plant are achieved by the MNN(Model Neural Network) which is continuously trained on-line. And secondly, the learning is performed by FNN controller. The error back propagation algorithm is adopted as a learning technique. The effectiveness of the proposed method will be demonstrated by computer simulation of a two d.o.f. robot manipulator.

유아의 언어능력과 자기조절능력 및 또래상호작용이 인지능력에 미치는 영향

김성현(Seong-Hyun Kim) 중앙대학교 한국교육문제연구소 2016 한국교육문제연구 Vol.34 No.2

본 연구는 만 5세 유아의 인지능력과 언어능력, 자기조절 그리고 또래상호작용 간의 관계성을 분석하는데 목적이 있다. 연구대상은 유치원에 재원중인 만 5세 유아 총 207명이었으며, 평균 월령은 70.79개월이었다. ‘K-ABC’, ‘구문의미이해력검사’, ‘자기조절능력척도’, ‘PIPPS’ 검사도구들을 통해 연구자료를 수집하였고 수집된 자료는 Pearson 적률상관과 단계적 중다회귀분석을 통해 검증하였다. 연구결과, 유아의 인지능력과 언어능력, 자기조절능력, 또래상호작용 간에 정적상관이 있는 것으로 밝혀졌다. 전체 인지능력을 가장 강력하게 예측한 변인은 자기조절로 나타났고 이어서 언어능력이 추가적 예측변인으로 밝혀졌다. 인지능력의 하위영역인 순차처리와 독립변인의 하위 요인 간 상대적 영향력을 분석한 결과 자기조절의 하위영역인 정서조절이 가장 강력한 예측변인으로 나타났으며 언어능력의 하위요인인 문법형태소가 추가적 예측변인으로 밝혀졌다. 또한 인지능력의 하위영역인 동시처리와 독립변인의 하위 요인 간 상대적 영향력을 분석한 결과 유아의 언어능력의 하위요인인 의미가 가장 강력한 예측변인으로 나타났으며 자기조절의 하위요인인 정서조절이 추가적 예측변인으로 나타났다. This study investigated the effects of language ability, self regulation, and peer-relationship on kindergartners’ cognitive ability. Participants were 207 children (mean age = 70.79 months) attending kindergartens in Korea. The study used the ‘Kaufman Assessment Battery for Children’, ‘Construction Meaning Comprehension Test’, the ‘Self-regulation Rating Scale for Young Children’, and the ‘PIPPS’ in collection of data. Collected data were analyzed through the SPSS 18.0 program and Pearson’s Correlation and Step-wise Multi Regression Analysis. Findings are as follows. First, there were positive correlations between children’s cognitive ability and language ability, self regulation, and peer-relationship. Second, self-regulation and language ability were predictable variables affecting the young children’s cognitive ability. Third, emotional-regulation, grammatical morpheme, and play disconnection were predictable variables affecting the young children’s sequential processing which is the subcategory of cognitive ability. Fourth, meaning, emotional-regulation and play interaction were found to be predictable variables affecting the young children’s Simultaneous Processing which is the subcategory of cognitive ability.

안정성 여유를 고려한 종축 비행제어법칙 최적화 프로그램 개발

김성현(Seong Hyeon Kim),고득원(Deuk Won Ko),이태현(Tae Hyun Lee),김병수(Byoung Soo Kim),김동환(Dong Hwan Kim) 한국항공우주학회 2020 한국항공우주학회 학술발표회 논문집 Vol.2020 No.11