다발성 장중첩증을 동반한 포이츠예거증후군에서 최소소장절제술 및 전소장내시경 용종절제 2예

유상범,김익용,조남천,김대성,김현수 대한외과학회 2002 대한외과학회 학술대회 초록집 Vol.2002 No.10

The Pattern of North Korea’s Local Military Provocations

유상범,김상진 한국국제정치학회 2017 The Korean Journal of International Studies Vol.15 No.1

In this article, the authors suggest a statistical analysis regarding the pattern of North Korea’s local military provocations by using quantitative data. The outcomes of the logit model indicate that there are negative relationships between provocations and regime-building periods, the Cold War era, and GDP per capita (limited to internal factors), while demonstrating a positive relationship with post-purge periods. Contrary to the widespread perception that NK leaders tended to be cautious when committing local military provocations during the combined forces exercises of the Republic of Korea and the United States militaries, results show that there was no systematic relationship, while North Korea was less likely to initiate local provocations during the reduction of U.S. forces in Korea. These outcomes tell us that the provocations are mostly driven by internal causes rather than external stimuli, and that North Korean leaders are more likely to utilize provocations in order to demonstrate power when they are politically strong and may have an incentive to divert internal economic discontent when the country is economically weak.

저궤도 기상위성용 마이크로파 탐측기의 요구 사항

유상범,이상규,용상순,이승훈,이혜숙,김도형 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11

수치예보를 위해서는 저궤도 기상위성에서 수동형 마이크로파 탐측기를 사용하여 마이크로파 복사에너지를 측정한 자료가 필요하다. 수동형 마이크로파 탐측기는 수증기 및 온도의 수직 분포를 측정하는 것으로서 크로스 트랙 스캔방식을 사용한다. 또한 매우 넓은 측정 주파수 범위를 요구하므로 적절한 안테나 장치를 설계할 필요가 있다. 본 연구에서는 수동형 마이크로파 탐측기의 요구사항을 연구하고, 크로스트랙 스캔 메카니즘과 공간해상도 성능을 분석하였다. It is necessary for numerical weather prediction to measure microwave radiation energy from low earth orbit weather satellite by using passive microwave sounder. Passive microwave sounder, which uses cross-track scanner, normally measures vertical distribution of water vapor and temperature of the low level atmosphere. Since it has to observe very wide range of frequency spectrum, appropriate antenna system and scan mechanism are the key elements of design. In this paper, we firstly analyze the cross track scan geometry and spatial resolution performance, and then present the requirements of passive microwave sounder.

한국 저궤도 기상 위상의 수동형 마이크로파 사운더 요구사항 분석

유상범,이상규,용상순,이승훈,김도형,이혜숙 한국기상학회 2015 한국기상학회 학술대회 논문집 Vol.2015 No.10

디지탈 직접 주파수 합성기를 이용한 16-QAM 변조기 설계

유상범,유흥균 한국음향학회 1999 韓國音響學會誌 Vol.18 No.5

고속 데이타를 전송하기 위하여 높은 스펙트럼 효율의 QAM 변조기를 설계하는 것은 매우 중요하다. 본 논문에서는 대표적인 16-QAM 변조기를 직접 디지탈 주파수 합성기(DDFS)를 응용하여 설계하였다. 직접 디지탈 주파수 합성기는 외부 주파수 설정에 의해 디지탈 방식으로 원하는 주파수의 정현파를 출력한다. 발생되는 위상 증가 값을 제어하여 정확한 위상변조를 할 수 있으며, 진폭 성분의 변화는 D/A 컨버터의 출력에서 발생하는 진폭을 변화시켜 진폭 변조하여, 전체적인 QAM 변조기를 설계한다. glitch와 같은 고조파 성분의 억제를 위하여 DDFS를 이중구조 형태로 설계하여 개선된 출력파형을 확인하였다. 회로 설계는 P-SPICE를 사용하였다. 아날로그 디지탈 혼합모드로 시뮬레이션하여 16-QAM 변조 파형을 확인하였고, 출력 데이터의 성상도를 출력하여 설계되어진 결과를 확인하였다. It is very important to design of QAM modulator of high spectral efficiency for high speed data transmission. In this paper, typical 16-QAM modulator is designed by modification design of DDFS(direct digital frequency synthesizer). DDFS generates sinusoidal waveform digitally to the frequency setting word. Phase modulation is accuratly made by control of a generated phase increment value and amplitude modulation is accomplished in the D/A converter output by control of amplitude level. For the suppression of harmonics and glitch, dual-structured DDFS is studied to improve the spurious characteristics. P-Spice is used for design and simulation in mixed mode. Also we can get the satisfactory results of designed 16-QAM modulator from the constellation output.

포이츠-예거 증후군에서 수술 중 내시경을 통한 소장용종 전절제술

유상범,김익용,성승훈,김대성,노병선 대한대장항문학회 2004 Annals of Coloproctolgy Vol.20 No.6

Patients with Peutz-Jeghers syndrome often suffer complications of the polyps, such as intussusception, bowel obstruction, and bleeding. Furthermore, repeated operations may be required in some patients, which may result in short-bowel syndrome. Intraoperative enteroscopy during a laparotomy for this syndrome was introduced. This can avert multiple enterotomies and decrease bowel resection segments. We report the cases of three consecutive patients with Peutz-Jeghers syndrome who recently underwent intraoperative enteroscopy via enterotomy with successful removal of most small-bowel polyps. The large polyps of the jejunum required an enterotomy for their removal, but smaller polyps at the lower ileum were identified and removed by using intra-operative total enteroscopy. A more complete polypectomy can be performed using this technique, thus allowing patients with Peutz- Jeghers syndrome a longer interval between laparotomies and a reduction in the symptoms attributed to polyps.

Asymmetric Fear and its Effects on the Alliance: Comparative Studies Between the Perceptions of Koreans and Americans

유상범 한국학술연구원 2019 Korea Observer Vol.50 No.3

The author tries to find an asymmetry of perception regarding threats and alliancerobustness, especially a non-linear relationship between how people perceive threatand alliance coherence in the small state, with a linear one in the strong state, inan asymmetric alliance. In an effort to find a possible explanation for this question,this project hypothesizes an inverted U-Shaped relationship between threat level andalliance coherence, and tests it through survey data, offering a framework to explainthe decoupling phenomena caused by asymmetric fear. The results of a statistical modelsupports the hypothesis and the author argues that there is a decoupling concern aboutthe ROK-US alliance in South Korean people's perception, while there is no observabletrend in the perceptions of people in the U.S. The inverted U-shape relationship betweenthreat and alliance coherence of people's perception can be accounted for in explainingNK behaviors more comprehensively.

The Possible Denuclearization Model of North Korea: Focusing on an Authoritarian Dilemma

유상범 국방대학교 국가안전보장문제연구소 2018 The Korean Journal of Security Affairs Vol.23 No.2

This paper tries to find a possibility for North Korea to break its non-compliance history for international agreements after the historical summit between leaders of two countries of U.S. and North Korea. This research starts with an assumption that the main purpose of Nuclear Weapon of NK is a tool to secure the regime security so that hypothesis is whether any state other than NK can guarantee its regime security especially against the internal challenge. In this respect, the role of China seems to be bigger than that of the U.S. with respect to overcoming the dilemma. China has a successful history of controlling democratic movements while securing one party control system, which will give some clues to NK about how to solve the authoritarian dilemma. In this sense, the role of China is expected to be critical in the area of internal regime security in addition to one of economic realm. The real concern, however, is whether the relationship between two states has been so robust for China to be a security guarantor to Kim’s regime. As a whole, it is very big challenge for Kim Jong-un to find out the North Korean Model that delivers economic prosperity and overcomes authoritarian dilemma at the same time.

“주민자치 통해 이웃 간 소통과 화합의 장 만들어야”

유상범 한국자치학회 2020 월간 주민자치 Vol.103 No.-

위협과 동맹 인식에 관한 연구: 동맹분리(decoupling)효과를 중심으로

유상범 동아시아국제정치학회 2018 국제정치연구 Vol.21 No.2

The author tries to find a non-linear relationship between how people perceive threat and need of alliance. Based on the threat based approach, alliance coherence is expected to increase as the level of threat develops. However, this is not applicable to North Korean behaviors that heighten or soften the nuclear and missile threat which would strengthen the robustness of ROK-US alliance that the North Korea does not want. This project hypothesizes an inverted U-Shaped relationship between threat level and alliance coherence, and test it with survey data. The result of a statistical model supports the hypothesis and the author argues that the underlying cause of North Korean Leader is decoupling the ROK-US alliance, which means that a constituent of alliance pursues its own interest when the threat level is extremely high and low. The inverted U-shape relationship between threat and alliance coherence of people's perception can be explaining NK behaviors more comprehensively. 이 논문은 위협인식과 동맹 결속력과는 어떤 관계가 있는지에 중점을 두고 연구하였다. 위협이 증가하면 동맹 결속력 또한 높아 질 것이라는 위협기반이론의 설명으로는 북한의 위협고조전략을 설명하기 어렵기 때문이다. 저자는 동맹분리(decupling)현상을 북한이 위협고조를 통해 얻고자 하는 중요과정임을 전제하고 이를 설명할 수 있는 분석틀을 제공하고, 여론조사 자료를 활용하여 위협인식과 동맹결속력과의 관계가 역U자 형태인, 음의 2차함수관계임을 밝혔다. 이는 위협이 아주 높거나, 낮은 경우에 동맹 결속력은 중간위협에 비해 현저히 줄어드는 관계임을 보여준 것으로 이는 동맹분리 현상을 실증적으로 보여준 결과라고 할 수 있다.