LED 리드프레임 패키징용 Cu/STS/Cu 클래드 메탈의 기계 및 열전도 특성의 온도 안정성 연구

김용성,김일권,Kim, Young-Sung,Kim, Il-Gwon 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.5

We have investigated thermal stability of the mechanical and thermal conductive properties of Cu/STS/Cu 3 layered clad metal lead frame material for a LED device package at different temperatures ranging from RT to $200^{\circ}C$. The fabricated Cu/STS/Cu clad metal has a good thermal stability for the mechanical tensile strength and thermal conductivity of the over 50 $Kg/mm^2$ to the $150^{\circ}C$ and 270 $W/m{\cdot}K$ to the $200^{\circ}C$, respectively. This clad metal lead frame material at a high temperature of $150^{\circ}C$ shows a reinforced mechanical tensile strength by 1.5 times to conventional pure copper lead frame materials and also a comparable thermal conductivity to typical copper alloy lead frame materials.

매립 지반에서의 지진파 증폭 특성

김용성,김기영,전제성,Kim Yong-seong,Kim Ki-Young,Jeon Je-Sung 한국농공학회 2005 한국농공학회논문집 Vol.47 No.5

In this study, borehole records were analyzed to verify the amplification of seismic motion at the soft reclaimed ground before and after the main event of the 1995 Hyogoken Nambu Earthquake at Port Island, Japan. From the analysis, it was shown that the amplification of seismic motion occurred near the soft ground surface (within 30 m below) where confining stress is low. Moreover, it was found that recovery of dynamic soil stiffness at the liquefied ground began gradually 3 hours after the liquefaction and completed in 10 days, when the ground exhibited the same seismic motion characteristics as those before the liquefaction.

디지털 프린팅용 도전성 접착제의 기계적.열적.전기적 특성

김용성,박태석,Kim, Young-Sung,Park, Tae-Suck 대한용접접합학회 2008 대한용접·접합학회지 Vol.26 No.2

Polydimethylsiloxane을 함유한 poly(N-isopropylacrylamide)? 합성 및 성질

김용성,배민애,윤구식,Kim, Young-Sung,Bae, Min-Ae,Yoon, Koo-Sik 대한화학회 2001 대한화학회지 Vol.45 No.3

양 밀단에 methacryl기를 함유한 polydimethylsiloxane(PDMS)을 가교제로 하여 poly(N-isopropylacrylamide)(PNIPAAm)을 합성하여 PDMS를 함유한 PNIPAAm을 얻었다. IR, DSC를 이용하여 그것들의 성질을 조사하였으며 DSC 조사결과 PNIPAAm과 PDMS는 각각 분리된 상으로 존재하는 것이 확인되었으며, PNIPAAm의 $T_g$는 PDMS의 함량이 증가하면 약간씩 감소하였다. 또한 온도에 따른 팽윤도를 조사한 결과 PDMS의 함량이 증가하면 팽윤도는 감소하였으나 lower critical solution temperature(LCST)는 큰 변화가 없었다. 수팽윤된 중합체의 DSC 측정결과도 LCST는 PDMS의 함량에 영향을 받지 않는 다는 것을 확인하였다. Poly(N-isopropylacrylamide) (PNIPAAm) containing polydimethylsiloxane (PDMS) was synthesized using PDMS as crosslinking agent, and characterized by IR and DSC. It seems that the copolymer has separated phases, PNIPAAm and PDMS. The $T_g$ of PNIPAAm was decreased in accordance with the increase of PDMS-contents. The swelling behavior of polymer in water was examined with the function of temperature and PDMS-contents as well. The equilibrium swelling ratio of polymer in water was decreased with increasing PDMS-contents, but lower critical solution temperature (LCST) was not significantly affected by the incorporated PDMS-contents.

백제 후기 능묘와 능원의 특성

김용성,Kim, Young-sung 국립문화재연구원 2014 헤리티지:역사와 과학 Vol.47 No.2

백제의 능묘는 금강유역으로 천도 후 송산리식의 횡혈식석실묘 ${\rightarrow}$ 남조식의 전실묘 ${\rightarrow}$ 능산리식의 횡혈식석실묘로 변천하였다. 이 변화에서 가장 눈에 띄는 것이 천장 구조의 변화이다. 천장은 궁륭천장(송산리식) ${\rightarrow}$ 터널천장(전실묘와 능산리식 과도기) ${\rightarrow}$ 집지붕천장(능산리식으로 제형, 삼각형, 평천장 세 아류의 형식)으로 변천했다. 이러한 변천과정에서 가장 특징적인 것은 능산리식 횡혈식석실로 이는 백제에서 창출된 특수한 형식이다. 백제의 능묘는 봉분을 중시하지 않아 현저하지 않았다. 이는 개별 능묘를 과시하여 표지하고자 하는 의도보다는 능원의 영역을 중시하는 가족공동체적인 성격이 강화된 것이고 남조의 영향으로 볼 수 있다. 백제의 능원은 백제가 남천한 후 왕가의 능원에서 단독의 독립능원으로 변천한다. 전자는 송산리와 능산리의 능원이고, 후자는 익산의 쌍릉이다. 전자는 완벽한 풍수지리와 함께 남조의 영향으로 볼 수 있고, 후자는 중국이 재통일된 수와 당초의 능원제 영향이다. 왕가의 능원에는 왕릉만 존재하는 것이 아니고 그와 관련된 인물을 배장하였다. 그리고 능원에는 제의시설이 존재했다. 송산리 능원에는 제단이 설치되어 있었는데, 이는 시조묘적인 성격도 가지고 있었을 가능성이 크다. 능산리 능원에는 공동의 능묘에 대해 제의를 시행할 수 있는 노천의 제의 공간이 마련되었고, 이 제의를 담당하면서 선왕에 대한 명복을 빌기 위한 능사가 설치되었다. 이러한 배치나 구조는 신라의 서악동 능원과 아주 유사하다. The royal tombs of Baekje(백제), after the transfer of the capital to the Geumgang(riv)(금강) basin, changed to Songsanri(송산리) style(stone chamber) ${\rightarrow}$ Southern dynastic(남조) style(brick chamber) ${\rightarrow}$ Neungsanri(능산리) style(stone chamber). The most special feature of this process is the change of the ceiling structure. The ceiling had been changed from dome(Songsanri style) ${\rightarrow}$ tunnel ceiling(transition period of brick tombs and Neungsanri style) ${\rightarrow}$ a roof style(is Neungsanri style of three imitate type, trapezoid, triangle, flattened ceiling). The most special feature among this process is Neungsanri style(stone chamber), created especially in Baekje. The royal tombs of Baekje didn't lay stress on the mound, so the mound is not noticeable. It is result that they more stressed on basin of the boundary than showed off individual tomb, and this is count as an element of China Southern dynasty. Boundary of the royal tomb of Baekje, after the transfer of the capital to south, were changed from royal family's boundary to single independent's. Those are Songsanri's and Neungsanri's, these are the pair tombs(쌍릉) of Iksan(익산). That is influence of the Southern dynasty, reflect the theory of divination based on topography completely, this is influence of the China Sui(수) and the early Tang(당) dynasty's system of boundary of the royal tomb. Besides the royal tomb, they also buried a closely related person, in the boundary of the royal tomb. And facilities for memorial ceremony were existed too. An altar was equipped in Songsanri's boundary of the royal tomb, it was seen a kind of character of a sanctuary for progenitor. Neungsanri's boundary of the royal tomb were equipped with an open-aired altar that performed memorial ceremony about communal royal tombs, and also equipped a temple, was needed to pray for the happiness of the dead. This structure and arrangement are very similar to Seoakdong(서악동) of Silla(신라).

한국 사회과학자들의 정보원에 관한 인용문헌 분석

김용성,Kim Young Sung 한국문헌정보학회 1988 한국문헌정보학회지 Vol.15 No.-

The main purpose of the present study is to investigate the citation habit of Korean social scientists by making use of citation analysis and content analysis, and to assess the nature of interdisciplinary flow of information in Korea in terms of the citation dependency on other disciplines, the types of channels used in formal scientific communication, the countries published the literatures of other disciplines cited in the source articles, and the languages used in the literatures of other disciplines. The major findings and conclusions reached at this study are summarised as follows: 1. Korean social scientists mainly cite the literatures of economics, sociology, politics, and history when they cite the literature of other disciplines. 2. The citation dependency on other disciplines of the economists, polictial scientists, and sociologists are 6 percents, 14 percents, and 19 percents, respectively. 3. The citation dependency on history of the economists is 25 percents, the dependency on sociology of the political scientists is 34.9 percents, and the dependency on economics of the sociologists is 50. 19 percents. 4. The types of channels used in formal scientific communication in social sciences are firmly book and journal. 5. The countries published the literatures of other disciplines .cited in the source articles are Korea and the U. S. firmly. 6. The languages used in the literatures of other disciplines cited in the source articles are Korean and English overwhelmingly.

DRNS용 SRTFR 변환기 설계에 관한 연구

김용성,Kim, Young-Sung 한국정보기술전략혁신학회 2009 情報學硏究 Vol.12 No.2

Residue Number System is used for the purpose of increasing the speed of processing in the many application parts of Image Processing, Computer Graphic, Neural Computing, Digital Signal Processing etc, since it has the characteristic of parallelism and no carry propagation at each moduli. DRNS has the twice RNS Conversion, it is used to decreases the size of the operator in RNS. But it has a week point on the Second Residue to First Residue Conversion time. So, in this paper SRTFR(Second Residue to First Residue) Converter using MRC(Mixed Radix Conversion) is designed to decrease the size of RTB(Residue to Binary) Converter. Since the proposed SRTFR Converter using MRC(Mixed Rdix Convertion) has a pipeline processing. Also, modular operation is applied to at each partitioned SAM(Subtraction and Addition) and MA(Multiplication and addition). In the following study, the more effective design on MA is needed.

전도성 페이스트 도포량 변화에 따른 결정질 태양광 모듈의 전기적 특성에 대한 영향성 분석

김용성,임종록,신우균,고석환,주영철,황혜미,장효식,강기환,Kim, Yong Sung,Lim, Jong Rok,Shin, Woo Gyun,Ko, Suk-Whan,Ju, Young-Chul,Hwang, Hye Mi,Chang, Hyo Sik,Kang, Gi-Hwan 한국재료학회 2019 한국재료학회지 Vol.29 No.11

Recently, research on cost reduction and efficiency improvement of crystalline silicon(c-Si) photovoltaic(PV) module has been conducted. In order to reduce costs, the thickness of solar cell wafers is becoming thinner. If the thickness of the wafer is reduced, cracking of wafer may occur in high temperature processes during the c-Si PV module manufacturing process. To solve this problem, a low temperature process has been proposed. Conductive paste(CP) is used for low temperature processing; it contains Sn57.6Bi0.4Ag component and can be electrically combined with solar cells and ribbons at a melting point of $150^{\circ}C$. Use of CP in the PV module manufacturing process can minimize cracks of solar cells. When CP is applied to solar cells, the output varies with the amount of CP, and so the optimum amount of CP must be found. In this paper, in order to find the optimal CP application amount, we manufactured several c-Si PV modules with different CP amounts. The amount control of CP is fixed at air pressure (500 kPa) and nozzle diameter 22G(outer diameter 0.72Ø, inner 0.42Ø) of dispenser; only speed is controlled. The c-Si PV module output is measured to analyze the difference according to the amount of CP and analyzed by optical microscope and Alpha-step. As the result, the optimum amount of CP is 0.452 ~ 0.544 g on solar cells.

미국의 실내건축 피난 규정에 관한 연구

김용성(Kim, Young-Sung),조성오(Cho, Sung-O) 한국실내디자인학회 2018 한국실내디자인학회논문집 Vol.27 No.3

The law reflects the situation of the times, understands the society, and shows the will of the state and the community. The Means of Egress should be maintained from design to construction, supervision, as well as use, in order to protect the lives and property of the residents as well as the safe use of the facilities. However, Interior Architects are think that evacuation and safety regulations are complex elements that change frequently and may inhibit the idea of design. The purpose of this study is to propose a design method for the use of safe facilities in the interior architectural design on the evacuation regulations affecting the actual design by the IBC(the International Building Code) and NFPA(National Fire Protection Association) LSC (Life Safety Code). The research method is to investigate and analyze the provisions related to the evacuation of interior architecture in the US and to understand the current regulations and the evacuation regulations. We suggest to design method to the details of the hallway, corridors, aisle accessway, door way, exit path, In particular, the design of furniture, tables and chairs layout that could be obstacles to evacuation situations is presented.

대가야 고총체계와 왕묘

김용성(Kim, Young-sung) 한국고대사탐구학회 2014 한국고대사탐구 Vol.18 No.-

고령과 그 인근 합천의 일부지역에 분포하는 대가야 고총은 고령 쾌빈리 목곽묘에서 발전하여 성립된 것으로 5세기 초 지산동 73호분에서 시작되었다. 세장방형의 수혈식석곽을 기조로 한 대가야 고총은 지산동 73호분과 75호분의 과도기를 거쳐 5세기 전반 지산동 30호분과 35호분 단계에서 정형화된 모습을 보이고, 5세기 후반 이후 44호분과 45호분과 같은 복잡한 초대형 묘로 발전한다. 대가야 고총은 묘곽의 배치에서 특이한 모습을 보이는데, 주부곽과 순장곽의 수나 그 배치 형태에 따라 5개의 유형으로 나눌 수 있다. 또한 주곽의 구조도 3개의 유형으로 나누어진다. 가장 복잡한 것의 경우 석곽의 내부에 目자형의 목곽을 설치하고 그 중간 칸에 피장자를 배치하여 다른 지역, 특히 신라의 고총과는 구별된다. 대가야 고총이 정형화된 모습을 갖춘 뒤 5세기 후반에는 대가야 권역의 각지로 확산되어 대가야의 고총체계가 성립된다. 이때 대가야식 고총이 축조된 지방으로는 합천 옥전, 거창 말흘리, 함양 백천리, 남원 월산리와 두락리 등을 들 수 있다. 이를 신라의 고총체계와 비교하면 늦어도 5세기 말 혹은 6세기 초에 대가야가 지역 수준을 넘어 광역의 영역을 가진 정치체인 초기국가로 발전했음을 보여준다. 이를 적극적으로 지지해 주는 것이 주산성의 남쪽 능선에 열을 지어 분포하는 대가야의 왕묘이다. 그것의 배치 양상은 당시 동아시아 제국의 왕묘 배치와 비견되는 것으로 대가야의 국제성을 드러내 준다. 그러나 대가야는 신라와 같이 율령을 가진 고대국가로는 발전하지 못하고 신라에 복속되어 지산동에서 고총의 축조는 막을 내린다.