자연어 처리와 텐서플로를 통한 언어표현 수치화 및 데이터 매칭에 대한 연구

김은진 ( Eunjin Kim ),김지혜 ( Jihye Kim ),김치훈 ( Chihun Kim ),배채은 ( Chaeeun Bae ),김영종 ( Youngjong Kim ) 한국정보처리학회 2019 한국정보처리학회 학술대회논문집 Vol.26 No.1

일상생활에서 사람들은 각자 자신의 맞춤형 생활을 원한다. 특히 쇼핑이나 강의 등 직접 사용한 자의 후기에 따라 구매를 하는 경우에는 선택이 중요하다. 따라서 이 연구를 통해 머신러닝의 속성 범주화로 사용자에게 꼭 맞는 제품과 강의를 연결 할 수 있도록 한다.

Characteristics of patients who visit the dental emergency room in a dental college hospital

Kim, Chihun,Choi, Eunhye,Park, Kyeong-Mee,Kwak, Eun-Jung,Huh, Jisun,Park, Wonse The Korean Dental Society of Anesthsiology 2019 Journal of Dental Anesthesia and Pain Medicine Vol.19 No.1

Background: Emergencies in dentistry can be classified as medical and dental. Medical emergencies occur mainly during dental treatment in patients with a systemic disease. Dental emergency departments are largely divided into dental emergency rooms located in dental college hospitals and medical emergency rooms located in medical institutions. This study aimed to analyze the characteristics of and provide help to dental emergency patients in a dental hospital. Methods: Overall, 1806 patients admitted to a dental emergency room at Yonsei University Dental Hospital for 1 year were included. The data collection period was from October 1, 2014 to September 30, 2015. An investigator reviewed medical records from the electronic medical record (EMR) system and radiographs. Results: The patients were 1,070 men and 736 women. The sex ratio was 1.45:1. The commonest age group was of 0-9 years, including 451 (25.0%) patients, followed by 20-29 years, including 353 (19.5%) patients, and 30-39 years, including 277 (15.3%) patients. Of the 108 patients transferred to the Severance emergency department, 81 had trauma, 19 were in pain, 4 were bleeding, and 4 had other complaints. Among chief complaints, 1,079 patients (60.3%) had trauma, 564 (31.5%) had pain, and 75 (4.2%) had bleeding. Twenty-three cases (1.3%) were caused by temporomandibular disorder (TMD). Conclusion: Dentists should be able to adequately assess patients in a dental emergency room and treat trauma, pain, and bleeding.

Counterbalanced Effect of Surface Trap and Auger Recombination on the Transverse Terahertz Carrier Dynamics in Silicon Nanowires

Chihun In,Jungmok Seo,Hyukho Kwon,Jeongmook Choi,Sangwan Sim,Jaeseok Kim,Taeyong Kim,Taeyoon Lee,Hyunyong Choi IEEE 2015 IEEE transactions on terahertz science and technol Vol.5 No.4

<P>The surface-trap mediated carrier recombination is a crucial feature in characterizing the optoelectronic properties of nanowires (NWs). Due to the one-dimensional characteristics, the photoexcited carriers experiences multiple carrier interactions in the transverse direction such that strong carrier-carrier interactions are expected to play an important role in the NW carrier recombination. Here, using ultrafast optical-pump and terahertz-probe spectroscopy, we show that the Auger scattering significantly reduces the trap-mediated decay process. Systematic studies on bulk Si, bundled, individual, and encapsulated (reduced surface-trap density) SiNWs reveal that the effect of Auger recombination exhibits strong pump-fluence dependence depending on the surface-treatment condition.</P>

Delayed bleeding after implant surgery in patients taking novel oral anticoagulants: a case report

Kim, Chihun,Dam, Chugeum,Jeong, Jieun,Kwak, Eun-Jung,Park, Wonse The Korean Dental Society of Anesthsiology 2017 Journal of Dental Anesthesia and Pain Medicine Vol.17 No.2

The use of novel oral anticoagulants (NOACs) has increased in recent times in an effort to overcome the shortcomings of warfarin. They are being used primarily for the prevention of thrombosis caused by atrial fibrillation and offer the advantages of having fewer drug interactions than warfarin, no dietary restrictions, and no requirement for regular blood tests. Although there is reportedly less postoperative bleeding even if the drug is not discontinued during procedures that can cause local bleeding, such as dental procedures, no well-designed clinical studies have assessed postoperative bleeding associated with the use of these drugs. This article reports a case of a 74-year-old male patient who was taking rivaroxaban. The patient underwent a dental implant procedure after discontinuing rivaroxaban for one day and subsequently suffered delayed bleeding on postoperative day 6. Accordingly, this article also reports that the use of NOACs may also lead to delayed bleeding.

A New Man, a New Woman, and Buddhism in The Story of an African Farm

Chihun Kim 한국동서비교문학학회 2015 동서 비교문학저널 Vol.0 No.33

Dissonance is embedded in the culture of Victorian society which can be featured by an age of transition in terms of science, technology, education, social class, economics, psychology, race, empire, religion, the law, gender and women’s rights. Schreiner’s The Story of an African Farm communicates such dissonance in terms of religion and the women questions. Although both Waldo and Lyndall try to create a new sense of identity as a new man and a new woman by liberating themselves from the oppression and violence of the established religion and authority, they seem to fail to attain their aims. Yet Schreiner suggests an alternative spirituality as a way of understanding humanity and the world, which is basically associated with the thoughts of Ralph Waldo Emerson and Buddhism. She seems to put an emphasis on the significance of an individual enlightenment, criticising the established religion and authority as an institution.

Multi-GNSS 다채널 신호기반, 저가 수신기의 효용성 검토

김치훈(Chihun Kim),김태현(Taehyun Kim),이용창(Yongchang Lee) 대한공간정보학회 2021 한국공간정보학회 학술대회 Vol.2021 No.6

조지 엘리엇의 『다니엘 데론다』에 드러난 종교적 초월성

김치헌(Kim, Chihun) 광주가톨릭대학교 신학연구소 2018 神學展望 Vol.- No.201

본고는 영국 19세기 빅토리아 시대의 대표적인 소설가 조지 엘리엇의 『다니엘 데론다』에 드러난 종교적 특징을 연구한다. 엘리엇은 당시 계몽주의, 과학적 사고, 합리적 이성을 바탕으로 전통적 종교의 권위에 도전하는 지성인들의 영향을 받았다. 특히 슈트라우스의 『예수 생애의 비판적 연구』와 포이어바흐의 『그리스도교 본질』은 그녀의 종교에 대한 태도를 바꾸는 데 매우 큰 역할을 하였다. 그녀는 어려서부터 엄격하고 열렬하게 믿었던 복음주의 신앙을 거부하고 교회에 다니지 않게 된다. 그러나 그녀가 종교와 신의 존재를 완전히 거부한 것은 아니다. 엘리엇은 종교를 부정하는 것이 아니라, 종교의 중요한 요소들 중의 하나인 도덕적 연민의 가르침을 실천하지 않았던 당시 종교의 모습을 비판한다. 더욱이 그녀의 모든 작품들은 종교적 언어와 의미들을 중요한 소재로 다루고 있다. 비평가들은 엘리엇이 종교의 초자연적 면들을 부정하고, 종교의 기능으로서 도덕적 선함만을 강조한다고 주장한다. 그러나 자신의 마지막 작품인 『다니엘 데론다』에서 엘리엇은 절대적 존재에 대한 현존과 체험을 보여주고 있다. 이 소설은 다니엘 데론다 라는 인물이 그리스도인으로 성장했지만, 나중에 부모님이 유다인이었다는 사실을 알아가며, 유다교 전통을 이어가는 이야기다. 엘리엇은 유다교 전통을 절대적 가치의 종교가 아니라, 모든 보편 인류에게 하나의 모델이 될 수 있는 종교 유형으로서 묘사한다. 소설의 주인공인 다니엘은 새로운 모세로 묘사되고 있지만, 한 특정 인종을 대변하는 인물이 아니라, 보편 인류에 적용될 수 있는 유형으로서의 모세이다. 그 유형의 핵심은 특정 종교의 고유한 초자연적 상징들을 드러내는 것이 아니라, 보편 인류에게 모델이 될 수 있는 도덕적 선함이다. 그러나 이 작품의 주요 등장인물들인 다니엘과 궨덜린이 도덕적 선함을 체험하는 과정에서 절대적 존재의 현존에 대한 경험을 드러내고 있다. 곧 엘리엇은 자신의 마지막 작품에서 과학적 시각과 합리적 이성 앞에 인간 삶의 경험과 체험의 깊이가 무엇인지를 보여주고 있다. This paper is going to examine the religious features in Daniel Deronda, written by George Eliot, one of the representative Victorian novelists. She was influenced by her contemporary intellectuals who had challenged the traditional authority of the Church from the perspectives of Enlightenment, a scientific way of thinking, and rationality. In particular, both Strauss’s The Life of Jesus Critically Examined and Feuerbach’s The Essence of Christianity played a key role in her attitude toward religion. She rejected Evangelicalism and stopped attending church which she had believed seriously and ardently since her childhood. She, however, does not deny religion and the existence of God. What she criticizes is not the religion itself, but the religion’s failure to practice the idea of sympathy which is one of the core essentials of religion. Furthermore, her works are coloured by religious language and ideas which appear to be very important elements to them. But the critics claim that she rejected the supernatural aspects of religion, but emphasized the moral goodness as the function of religion. Yet, she demonstrated the presence and experience of the Absolute being in her last work, Daniel Deronda. This is a story about a character, Daniel Deronda, who, although he had grown up as a Christian, he discovered his Jewish origin and carried on his Jewish tradition. In fact, Eliot presents Judaism, not as a religion with absolute values, but as a type of religion which can be a model for the whole human being. Although the protagonist, Daniel, is described as a new Moses, he does represent one particular race but instead of Moses as a type which can be applied to the whole human beings. And the core essence of the type is not the one which may reveal the unique supernatural symbols of a particular religion, but the moral goodness which can be a model for human beings. Yet, the two main characters, Daniel and Gwendolen, show their experience of the presence of the Absolute being in their encountering the moral goodness. In her last novel, Eliot seems to present the depth of how the experience and encountering of human life can set over against a scientific way of thinking and rationality.

Scratch - Pad 메모리를 위한 동적 코드 배치 기법

김지훈(Chihun Kim),장춘기(Choonki Jang),이재진(Jaejin Lee),민상렬(Sang Lyul Min) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.1

SPM (Scratch-Pad Memory)을 위한 코드 배치 기법과 demand paging기법을 post pass optimizer를 사용하여 구현한다. 코드 배치 문제는 ILP (Integer Linear Programming) 문제로 변환하여 해결한다. 최적화기는 ILP 해답의 질을 높이기 위해 응용 프로그램의 프로파일 정보를 사용하고, 코드로부터 natural loop을 추출한다. 또한 SPM을 사용하여 demand paging을 할수 있도록 추가 코드를 삽입한다. 이 기법을 사용해 6개의 내장형 응용 프로그램을 실험하였고, 프로그램 크기의 20%에 해당하는 SPM에 대해 전력 소모는 75.9%로 감소하였고 성능은 54.5% 증가 하였다.

Control over Electron–Phonon Interaction by Dirac Plasmon Engineering in the Bi₂Se₃ Topological Insulator

In, Chihun,Sim, Sangwan,Kim, Beom,Bae, Hyemin,Jung, Hyunseung,Jang, Woosun,Son, Myungwoo,Moon, Jisoo,Salehi, Maryam,Seo, Seung Young,Soon, Aloysius,Ham, Moon-Ho,Lee, Hojin,Oh, Seongshik,Kim, Dohun,Jo, American Chemical Society 2018 NANO LETTERS Vol.18 No.2

<P>Understanding the mutual interaction between electronic excitations and lattice vibrations is key for understanding electronic transport and optoelectronic phenomena. Dynamic manipulation of such interaction is elusive because it requires varying the material composition on the atomic level. In turn, recent studies on topological insulators (TIs) have revealed the coexistence of a strong phonon resonance and topologically protected Dirac plasmon, both in the terahertz (THz) frequency range. Here, using these intrinsic characteristics of TIs, we demonstrate a new methodology for controlling electron-phonon interaction by lithographically engineered Dirac surface plasmons in the Bi2Se3 TI. Through a series of time-domain and time-resolved ultrafast THz measurements, we show that, when the Dirac plasmon energy is less than the TI phonon energy, the electron-phonon coupling is trivial, exhibiting phonon broadening associated with Landau damping. In contrast, when the Dirac plasmon energy exceeds that of the phonon resonance, we observe suppressed electron-phonon interaction leading to unexpected phonon stiffening. Time-dependent analysis of the Dirac plasmon behavior, phonon broadening, and phonon stiffening reveals a transition between the distinct dynamics corresponding to the two regimes as the Dirac plasmon resonance moves across the TI phonon resonance, which demonstrates the capability of Dirac plasmon control. Our results suggest that the engineering of Dirac plasmons provides a new alternative for controlling the dynamic interaction between Dirac carriers and phonons.</P>

영상해석용 오픈소스 기반 UAS 촬영영상 해석 필터링 비교

김태희(Taehee Kim),김치훈(Chihun Kim),이용창(Yongchang Lee) 대한공간정보학회 2020 한국지형공간정보학회 학술대회 Vol.2020 No.6