Effect of stocking density and sex on growth performance, meat quality, and intestinal barrier function in broiler chickens

Goo, D,Kim, J H,Choi, H S,Park, G H,Han, G P,Kil, D Y Elsevier 2019 Poultry science Vol.98 No.3

플라즈마 회전전극법에 의한 Al-Cu 합금 분말의 제조

최국선,김진영,이동희 연세대학교 대학원 1991 延世論叢 Vol.27 No.1

The production and characterization of Al-Cu alloy powders by the plasma- rotating-electrode process(PREP) was carried out to determine the influence of operating conditions(rotating speed, and plasma current) and alloy compositions on such particle characteristics as particle size distributon, shape, microstructure, and chemical composition. Each experimental condition showed a particle size range of 75∼353μm with mean sizes of 140∼160μm. The mean particle size of the powders changed with alloy compositions at the same rotating speed and plasma current. Particle shapes were mostly of the ligament type. Microstructures consisted mainly of dendrites, but also lamellar cell in the vicinity of eutectic composition. Al -20wt.% Cu powders of the same size, from even a single atomizing run, showed a wide variety of microstructure due to different thermal and nucleation history. Chemical compositions of alloy powders varied with particle size as a result of the interaction between high temperature plasma gas and material constituents of alloys during powder formation.

304L 오스테나이트 스테인레스강 분말의 소결성에 미치는 Mo의 첨가 영향

최국선,이동희,최왕규 연세대학교 산업기술연구소 1989 논문집 Vol.21 No.2

An investigation of Mo addition effect on the sinterability of 304L austenitic stainless steel powders was carried out by using the compacts of three different Mo contents(0.2 and 5 wt%) and using diffusion couple of same stainless steel and Mo powders. The compacts of pure stainless steel powder showed conventional sintering process. And also. we found the diffusion (alloying) layer, 60㎛, and porosity formation toward stainless steel compact in the vicinity of coupled zone by means of SEM and EDS analysis. The porosity of compacts to which Mo was added, was high compared with no Mo added compacts except early stage of sintering. But in compacts sintered at 1200℃ for 45 min, the abnormal increase of porosity could be understood by "bridging" effect of alloying layer formed during sintering process.

기계적 합금화에 의해 제조된 고규소 Al-Si 합금 나노 결정의 특성

이정일,김일호,홍태환,어순철,양계준,석현광,한만갑,최국선,김준수 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.7

High silicon Al-Si alloys with nanocrystalline structures have been produced by mechanical alloying process. Microstructural changes of the Al-Si alloys were investigated by scanning electron microscopy and the transmission electron microscopy. X-ray diffraction analysis was also made to characterize the lattice constant, crystallite size and misfit strain. It was found that the effective milling time by attrition milling was about 12hours for Al-70 wt%Si alloy system. The Al and Si crystallites were reduced to about 30 nm and 70 nm, respectively, by the mechanical alloying for more than 12hours. The misfit strains increased with milling time UD to 240 hours, and saturated to 5.73×10^(-3) for Al and Si crystallites, respectively.

SUNSHINE, EARTHSHINE AND CLIMATE CHANGE I. ORIGIN OF, AND LIMITS ON SOLAR VARIABILITY

GOODE PHILIP R.,DZIEMBOWSKI W. A. The Korean Astronomical Society 2003 Journal of The Korean Astronomical Society Vol.36 No.suppl1

Changes in the earth's climate depend on changes in the net sunlight reaching us. The net depends on the sun's output and earth's reflectance, or albedo. Here we develop the limits on the changes in the sun's output in historical times based on the physics of the origin of solar cycle changes. Many have suggested that the sun's output could have been $0.5\%$ less during the Maunder minimum, whereas the variation over the solar cycle is only about $0.1\%$. The frequencies of solar oscillations (f- and p-modes) evolve through the solar cycle, and provide the most exact measure of the cycle-dependent changes in the sun. But precisely what are they probing? The changes in the sun's output, structure and oscillation frequencies are driven by some combination of changes in the magnetic field, thermal structure and velocity field. It has been unclear what is the precise combination of the three. One way or another, this thorny issue rests on an understanding of the response of the solar structure to increased magnetic field, but this is complicated. Thus, we do not understand the origin of the sun's irradiance increase with increasing magnetic activity. Until recently, it seemed that an unphysically large magnetic field change was required to account for the frequency evolution during the cycle. However, the problem seems to have been solved (Dziembowski, Goode & Schou 2001) using f-mode data on size variations of the sun. From this and the work of Dziembowski & Goode (2003), we suggest that in historical times the sun couldn't be much dimmer than it is at activity minimum.

SUNSHINE, EARTHSHINE AND CLIMATE CHANGE: II. SOLAR ORIGINS OF VARIATIONS IN THE EARTH'S ALBEDO

GOODE P. R.,PALLE E.,YURCHYSHYN V.,QIU J.,HICKEY J.,RODRIGUEZ P. MONTANES,CHU M.-C.,KOLBE E.,BROWN C.T.,KOONIN S.E. The Korean Astronomical Society 2003 Journal of The Korean Astronomical Society Vol.36 No.suppl1

There are terrestrial signatures of the solar activity cycle in ice core data (Ram & Stoltz 1999), but the variations in the sun's irradiance over the cycle seem too small to account for the signature (Lean 1997; Goode & Dziembowski 2003). Thus, one would expect that the signature must arise from an indirect effect(s) of solar activity. Such an indirect effect would be expected to manifest itself in the earth's reflectance. Further, the earth's climate depends directly on the albedo. Continuous observations of the earthshine have been carried out from Big Bear Solar Observatory since December 1998, with some more sporadic measurements made during the years 1994 and 1995. We have determined the annual albedos both from our observations and from simulations utilizing the Earth Radiation Budget Experiment (ERBE) scene model and various datasets for the cloud cover, as well as snow and ice cover. With these, we look for inter-annual and longer-term changes in the earth's total reflectance, or Bond albedo. We find that both our observations and simulations indicate that the albedo was significantly higher during 1994-1995 (activity minimum) than for the more recent period covering 1999-2001 (activity maximum). However, the sizes of the changes seem somewhat discrepant. Possible indirect solar influences on the earth's Bond albedo are discussed to emphasize that our earthshine data are already sufficiently precise to detect, if they occur, any meaningful changes in the earth's reflectance. Still greater precision will occur as we expand our single site observations to a global network.

Bone Framework Graft through an Intraoral Approach in a Patient with Columellar Scar Contracture

Myung-Good Kim,Ie Hyon Park,Chang Sik Pak,Baek-Kyu Kim,Jae Hoon Jeong 대한미용성형외과학회 2016 Archives of Aesthetic Plastic Surgery Vol.22 No.3

We present our experience with calvarial bone framework insertion through an intraoral approach for a patient who was at risk for columellar necrosis due to a previous open rhinoplasty. A 58-year-old woman exhibited severe columellar contracture, so that the columellar tissue was too fragile to be touched. We could not incise the columella and insert a new nasal implant through the bilateral rim incision. Moreover, the patient had septal cartilage perforation and collapse. The patient needed columellar support as well as nasal dorsum reconstruction. The authors decided to graft an autogenous L-strut bone framework through an intraoral approach. Two pieces of 5-cm × 1-cm sized split calvarial bone were harvested and trimmed to fit the width and length of the nasal dorsum and columella. The right-angle-shaped bone framework was made with an absorbable plate and screws. Through a gingivobuccal incision, the bone framework graft was inserted and the graft was fixed with absorbable screws. The patient did not experience complications such as skin necrosis or inflammation. A bone framework grafted through an intraoral approach can be a good choice for patients who have experienced scar contracture in the columella, septal cartilage perforation, and collapse.

드라마에서 언어와 이미지의 구조와 작동원리 -텔레비전드라마 「미생」(2014)을 중심으로

양승국 ( Sun-good Yang ) 서울대학교 인문학연구원 2016 人文論叢 Vol.73 No.2

행동의 형식인 드라마는 이 행동을 언어와 이미지로 드러내며 사건을 진행한다. 따라서 드라마 미학의 방법론은 이 언어와 이미지의 구조와 작동원리를 분석하는 데에 핵심이 놓인다고 할 수 있다. 본고는 논자가 지금까지 시도해 온 일련의 논의 과정의 연장선상에서 주로 현상학적 관점과 지각 이론에 기대어 이들의 구조와 드라마에서의 작동원리를 고찰하였다. 이를 위해 본고에서는 특히 텔레비전드라마 「미생」(2014)을 중심으로 언어와 이미지의 관련성, 카메라의 시점이 언어와 이미지를 구성하는 방법을 탐구하였다. 텔레비전드라마는 인물의 발화를 통한 청각과 인물의 행동과 사물을 보여주는 시각의 지각작용이 밀접하게 조화되어 관객의 감정 이입을 자연스럽게 이끌어낸다. 이를 통해 관객은 텔레비전드라마가 보여 주는 드라마의 세계를 자신의 ‘주위세계’로 인식하게 되고, ‘나’가 아닌 ‘우리’로서의 ‘세계-내-존재’의 존재성을 자각하게 된다. 오늘날 텔레비전드라마가 드라마 형식의 중심을 차지하게 된 것은 바로 이러한 텔레비전드라마의 미학적 구조에 기인한다. Owing to the development of visual media, movies and television dramas are central to the drama form recently. Especially, Korean television dramas have made a remarkable qualitative progress since the 1990s, and it is no exaggeration to say that they are the aesthetic model of other television dramas around the world today. While enjoying television dramas in our daily lives, however, we have no epistemological self-consciousness of why we are immersed in watching television dramas this much. In addition, new television dramas are constantly being produced with a similar format, but we have not even found a methodology good enough to discover common aesthetics among them and to extract distinctive features. As a form of behaviors, dramas develop events by exposing behaviors with words and images. Therefore, the methodology of drama aesthetics can be regarded to focus on analyzing the structure and mechanism of such words and images. Thus, as a part of the process of discussion I have attempted so far, this study aims to examine the structure and mechanism of words and images in dramas, based on phenomenological views and perception theories. Particularly, this study attempted to explore the relation between words and images and how to compose words and images by the camera point of view, especially focusing the form of television dramas. Besides, this study investigated how the structure and mechanism of words and images get related to the way of television dramas showing themes. Television dramas can naturally draw out viewers’ empathy through a close harmony between the auditory perception from television drama characters’ utterances and the visual perception showing their behaviors and objects. Through this process, Viewers perceive the world provided by television dramas as their own ‘environment (Umwelt)’ and recognize their existence of ‘Being-in-the-world (In-der-Welt-Sein)’ as ‘us’ not ‘me’. Today, television dramas have become central to the drama form, and it is attributed to such an aesthetic structure of television dramas. This study has a feature as a preliminary review to explore the general aesthetic mechanism of television dramas. Thus, this study attempted to seek a methodology of analyzing universal dramas, particularly focusing on Misaeng out of all the Korean dramas.

Resolution-Aware Deep Learning Model for Emergency Communication in Smart Homes using Thermal Sensor

Goodness Oluchi Anyanwu,Cosmas Ifeanyi Nwakanma,Adinda Riztia Putri,JeongHan Kim,Gihwan Hwang,Jae-Min Lee,Dong-Seong Kim 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2

Due to the development in sensor technologies and smart homes, Emergency and Activity Detection (EAD) has become a growing research issue as there is a need to support safety and security in homes. In this work, the impact of three different thermal sensor resolutions was investigated for EAD. The design of the system includes three parts: data acquisition, EAD and the emergency alert system. An alert system is considered reliable if the sensing model can mitigate the introduction of noise by the sensors or noisy environments. Research in this domain has seen the adoption of sensors with different resolutions. However, not much work has been done in developing resolution-aware models considering the impact of sensor resolutions on both the quality of data and the performance of the classification models. In this work, a CNN model was developed for EAD from datasets of various sensors with diverse resolutions. The results showed that the proposed model exhibited resilience in handling the error that may occur from the impact of sensor resolution for classification of normal daily living activity and emergency in a smart home.

Analyzing Behavioral Patterns of Authorized User’s Access Interruption on CAM using Random Forest

Goodness Oluchi Anyanwu,Jae-Min Lee,Dong-Seong Kim 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.11