신석기시대 입지 환경에 따른 따비의 제작방법 -암사동·운서동 유적 출토품을 중심으로-

김영준 ( Kim¸ Youngjun ) 단국사학회 2020 史學志 Vol.60 No.-

이 글에서는 신석기시대에 구릉지와 충적지 주거지 유적에서 출토되는 따비의 제작기술 차이를 확인하고, 이러한 차이가 왜 나타나는지 살펴보았다. 한강 본류역에는 지형상 구릉지와 충적지에 신석기시대 주거지 유적이 확인되며, 이들 유적에서는 대표적인 뗀석기로 따비가 공통적으로 출토되고 있다. 하지만 지금까지 선행연구들은 따비의 형태분류가 중심이어서 이들 유적 출토 따비를 하나의 범주로 분류하여 입지 환경에 따라 나타나는 다양한 기술적 측면을 소홀히 다루었다. 충적지를 대표하는 암사동 유적 출토 따비의 경우 돌감으로는 돌결면이 발달하지 않은 조직이 치밀한 자갈돌 각섬암과 응회암을 이용하였고, 구릉지를 대표하는 운서동 유적 출토 따비의 경우 돌결면이 매우 발달한 모난돌 편암을 이용하였다. 입지환경 별 따비의 밑감은 암사동 유적의 경우 너비격지를 운서동 유적의 경우 모난돌 조각을 이용하여 따비 제작에 사용하였다. 이러한 제작기술의 차이는 결국 입지환경에 따른 사용방법에 차이, 즉 장착 유무에서 기인하였다고 판단된다. 충적지 유적인 암사동 유적 따비는 장착없이 사용된 도구로 파악되며, 구릉지 유적인 운서동 유적 따비는 목제에 장착하기 위해 만들어진 따비임이 제작기술에서 확인된다. This article explains the technical differences of manufacturing weederplow derived from residential sites located in alluvion or hill areas, and then tries to approach the reason why these differences are made. Neolithic residential sites are confirmed, which are located in alluvion or hill areas of main river valley in Hangang river, and weederplow is one of the representative remains from the sites. However, according to the precedent studies, they did not pay attention to various technical aspects of weederplow because morphological characteristics were the main point. Amphibolite and tuff that have densed and undelveloped surface, were used to make weederplow from Amsadong, which is one of the representative remains in alluvion areas and schist that has developed surface, was used to make weederplow from Unseodong, which is one of the representative remains in hilly areas. In case of Amsadong, flake was used to make weederplow and in Unseo case, debris was used as the raw material. These technical differences could be made by method of use depending on geographical conditions, in other words, With or without mounting is the key. Amsadong weederplow from alluvion areas might be used without equipment, but Unseo weederplow might have the purposed to be equipped with wood and it could be shown in the manufacturing process.

[PC-0012] Pre-study for early detection of Fusarium fujikuroi via fluorescence imaging method

Jaeyoung Kim(Jaeyoung Kim),Younguk Kim(Younguk Kim),Hyeonso Ji(Hyeonso Ji),Songlim Kim(Songlim Kim),Hyoja Oh(Hyoja Oh),Youngjun Mo(Youngjun Mo),Kyunghwan Kim(Kyunghwan Kim),Jeongho Baek(Jeongho Baek) 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-

Electromagnetic Interference (EMI) Transparent Shielding of Reduced Graphene Oxide (RGO) Interleaved Structure Fabricated by Electrophoretic Deposition

Kim, Sanghoon,Oh, Joon-Suk,Kim, Myeong-Gi,Jang, Woojin,Wang, Mei,Kim, Youngjun,Seo, Hee Won,Kim, Ye Chan,Lee, Jun-Ho,Lee, Youngkwan,Nam, Jae-Do American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.20

<P>Here we introduce the electromagnetic shielding effectiveness (SE) of reduced graphene oxide (RGO) sheets interleaved between polyetherimide (PEI) films fabricated by electrophoretic deposition (EPD). Incorporating only 0.66 vol % of RGO, the developed PEI/RGO composite films exhibited an electromagnetic interference shielding effectiveness (EMI SE) at 6.37 dB corresponding to ∼50% shielding of incident waves. Excellent flexibility and optical transparency up to 62% of visible light was demonstrated. It was achieved by placing the RGO sheets in the localized area as a thin film (ca. 20 nm in thickness) between the PEI films (ca. 2 μm) to be an interleaved and alternating structure. This unique interleaved structure without any delamination areas was fabricated by a successive application of cathodic and anodic EPD of both RGO and PEI layers. The EPD fabrication process was ensured by an alternating deposition of the quarternized-PEI drops and RGO, each taking positive and negative charges, respectively, in the water medium. We believe that the developed facile fabrication method of RGO interleaved structure with such low volume fraction has great potential to be used as a transparent EMI shielding material.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-20/am503893v/production/images/medium/am-2014-03893v_0009.gif'></P>

MESSAGE TYPE STRATEGY IN CHARITABLE FUNDRAISING

Youngjune Kim,Hakkyun Kim,Hyeonyeong Seo,Hyoseon Lee 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7

In appeals for donations, some charities highlight why their programs are important or abstract meanings that individuals' contributions can have. On the other hand, some other charities highlight how their programs are implemented or specific actions that are to be made. Drawing on construal level theory, we posit that abstract, “why” laden appeals will be more persuasive than concrete, “how” laden appeals when psychological distance (via physical distance) is high (vs. low). One experiment was conducted to test this premise. Specifically, we examined whether the location where the programs of a nonprofit organization were run was far (i.e., a foreign country) or near (i.e., domestically) would moderate the persuasiveness of abstract versus concrete messages. In terms of the procedure, participants were first asked to read a message from a nonprofit organization helping children suffering from rare diseases in their own country or in foreign countries. Then, they indicated the extent to which they were willing to help the nonprofit. To manipulate the message type, we varied the headline as well as the content of the message so as to make on version construed at a low level and the other at a high level. Further, to investigate a moderating role of disease types, we measured the changes in response to when disease names are suggested more specifically due to the variation in the degree of familiarity to the charity subject. The results of this experiment supported our prediction on the fit effect between physical distance and message type. To be specific, when the appeal was for a foreign cause, abstract messages generated a higher willingness to help the nonprofit. Conversely, when the appeal was for a local cause, concrete messages generated a higher willingness to help the nonprofit. These results indicate construal fit effect in a charitable giving context. Furthermore, we investigated a moderating role of disease types given that such fit effects can be stronger among low- (vs. highly) familiarity of disease. We observed a significant three-way interaction involving the degree of familiarity.

Virtual Reality and Augmented Reality in Plastic Surgery: A Review

Kim, Youngjun,Kim, Hannah,Kim, Yong Oock Korean Society of Plastic and Reconstructive Surge 2017 Archives of Plastic Surgery Vol.44 No.3

Recently, virtual reality (VR) and augmented reality (AR) have received increasing attention, with the development of VR/AR devices such as head-mounted displays, haptic devices, and AR glasses. Medicine is considered to be one of the most effective applications of VR/AR. In this article, we describe a systematic literature review conducted to investigate the state-of-the-art VR/AR technology relevant to plastic surgery. The 35 studies that were ultimately selected were categorized into 3 representative topics: VR/AR-based preoperative planning, navigation, and training. In addition, future trends of VR/AR technology associated with plastic surgery and related fields are discussed.

Characterization and carbohydrate binding specificity of lectin isolated from Maackia fauriei

Kim HaHyung,Kim ByungSu,Kim KiDon,Na YoungJun,Lee HyunJung,Koo WanMo,Kim BumSoo 대한약학회 2004 大韓藥學會 總會 및 學術大會 Vol.2004 No.2

Highly stable 2D material (2DM) field-effect transistors (FETs) with wafer-scale multidyad encapsulation

Kim, Choong-Ki,Jeong, Eun Gyo,Kim, Eungtaek,Song, Jeong-Gyu,Kim, Youngjun,Woo, Whang Je,Lee, Myung Keun,Bae, Hagyoul,Jeon, Seong-Bae,Kim, Hyungjun,Choi, Kyung Cheol,Choi, Yang-Kyu IOP 2017 Nanotechnology Vol.28 No.5

<P>Field-effect transistors (FETs) composed of 2D materials (2DMs) such as transition-metal dichalcogenide (TMD) materials show unstable electrical characteristics in ambient air due to the high sensitivity of 2DMs to water adsorbates. In this work, in order to demonstrate the long-term retention of electrical characteristics of a TMD FET, a multidyad encapsulation method was applied to a MoS<SUB>2</SUB> FET and thereby its durability was warranted for one month. It was well known that the multidyad encapsulation method was effective to mitigate high sensitivity to ambient air in light-emitting diodes (LEDs) composed of organic materials. However, there was no attempt to check the feasibility of such a multidyad encapsulation method for 2DM FETs. It is timely to investigate the water vapor transmission ratio (WVTR) required for long-term stability of 2DM FETs. The 2DM FETs were fabricated with MoS<SUB>2</SUB> flakes by both an exfoliation method, that is desirable to attain high quality film, and a chemical vapor deposition (CVD) method, that is applicable to fabrication for a large-sized substrate. In order to eliminate other unwanted variables, the MoS<SUB>2</SUB> FETs composed of exfoliated flakes were primarily investigated to assure the effectiveness of the encapsulation method. The encapsulation method uses multiple dyads comprised of a polymer layer by spin coating and an Al<SUB>2</SUB>O<SUB>3</SUB> layer deposited by atomic layer deposition (ALD). The proposed method shows wafer-scale uniformity, high transparency, and protective barrier properties against adsorbates (WVTR of 8?×?10<SUP>−6</SUP> g m<SUP>−2</SUP> day<SUP>−1</SUP>) over one month.</P>

Method to minimize ozone effect on Cy5 fluorescent intensity in DNA microarrays

Kim, Youngjun,Seo, Hyun Hee,Jeong, Mi Seon,Lee, Ki Heon,Lee, In Ho,So, Kyeong A.,Kim, Mi Kyung,Lee, Yoo-Kyung,Kim, Seon Ah,Kim, Tae Jin Elsevier 2017 Analytical Biochemistry Vol.538 No.-

<P><B>Abstract</B></P> <P>Cyanine 5 (Cy5) is an established fluorescent dye in microarray analysis. It is degraded rapidly when exposed to atmospheric ozone during post-hybridization washes, which leads to loss of fluorescent intensity. To minimize this undesirable effect, we coated microarray slides with sodium dodecyl sulfate (SDS) solution at post-hybridization washes. The fluorescent intensities on coated slides were more stable than those on uncoated slide. We also performed the microarrays with SDS solution for a year to check the solution's effectiveness along with seasonal changes of atmospheric ozone level. Consistent results in microarray analysis were obtained using Cy5 dye under atmospheric ozone.</P>

Synthesis of two-dimensional MoS₂/graphene heterostructure by atomic layer deposition using MoF₆ precursor

Kim, Youngjun,Choi, Daeguen,Woo, Whang Je,Lee, Jae Bok,Ryu, Gyeong Hee,Lim, Jun Hyung,Lee, Sunhee,Lee, Zonghoon,Im, Seongil,Ahn, Jong-Hyun,Kim, Woo-Hee,Park, Jusang,Kim, Hyungjun Elsevier BV * North-Holland 2019 Applied Surface Science Vol.494 No.-

<P><B>Abstract</B></P> <P>The effective synthesis of two-dimensional (2D) heterostructures is essential for their use in electronic devices. In this study, by using atomic layer deposition (ALD), 2D transition metal dichalcogenide (TMD) heterostructures were grown by a halide precursor. This study shows the growth characteristics of the fluoride precursor compared to the chloride precursor used for the synthesis of the TMD on the graphene layer and the other TMD layer. Additionally, a carbonyl precursor was used for comparison with the halide precursor in terms of the thermal stability. From these experiments, the fluoride precursor was adequate for synthesizing on the graphene, however, was inappropriate for the TMD/TMD heterostructure because of its etching characteristic. Meanwhile, the chloride precursor was appropriate for the TMD/TMD heterostructure, even for a low binding energy with the substrate, but was inadequate in forming the TMD/graphene heterostructure, even if the ALD cycle increased. Through our experiments, we show, for the first time, that there exists a suitable halide precursor for a 2D layer for a substrate.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of two-dimensional MoS<SUB>2</SUB> synthesized by MoF<SUB>6</SUB> precursor using atomic layer deposition </LI> <LI> MoF<SUB>6</SUB> is suitable for MoS<SUB>2</SUB>/graphene heterostructure </LI> <LI> Chloride precursor is suitable for transition metal dichalcogenide based heterostructure </LI> <LI> Different precursors are suitable depending on the substrate when forming the heterostructure in the atomic layer deposition </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Formation of a functional homo-junction interface through ZnO atomic layer passivation: Enhancement of carrier mobility and threshold voltage in a ZnO nanocrystal field effect transistor

Kim, Youngjun,Chang, Mincheol,Cho, Seongeun,Kim, Minkyong,Kim, Hyunsik,Choi, Eunsoo,Ko, Hyungduk,Hwang, Jinha,Park, Byoungnam Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.804 No.-

<P><B>Abstract</B></P> <P>We report enhancement of mobility and increase in mobile carrier concentration in zinc oxide (ZnO) nanocrystal (NC) field effect transistors (FETs) through the formation of a homo-junction interface using atomic layer deposition (ALD) passivation. An ultrathin ALD-ZnO passivation film deposited on a ZnO NC film not only increased the FET mobility from 4.6ⅹ10<SUP>−6</SUP> to 1.4ⅹ10<SUP>−4</SUP> cm<SUP>2</SUP>/V but also caused earlier turn-on of the ZnO NC FETs, shifting the threshold voltage from 18.9 to −4.6 V. The enhanced FET mobility and earlier turn-on in the FET are attributed to reduced localized state density on the ZnO NC surface through ALD-ZnO passivation. Passivation of the surface states mitigates carrier depletion in the ZnO NC film through oxygen adsorption on the ZnO surface. We also observed that the presence of saturation of the drain in a high drain-source voltage region depends on the ALD-ZnO passivation and its origin is discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We formed a ZnO-NC/ZnO-ALD planar-homojunction interface, passivating the surface. </LI> <LI> Carrier mobility in the accumulation layer was enhanced by surface passivation. </LI> <LI> Suppression of surface depletion by ALD are crucial in assembling devices. </LI> </UL> </P>