• Journal of IKEEE
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• v.5 no.1 s.8
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• pp.100-110
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• 2001

In this paper, we investigated several buffer management schemes for the design of shared-memory type ATM switches, which can enhance the utilization of switch resources and can support quality-of-service (QoS) functionalities. Our results show that dynamic threshold (DT) scheme demonstrate a moderate degree of robustness close to pushout(PO) scheme, which is known to be impractical in the perspective of hardware implementation, under various traffic conditions such as traffic loads, burstyness of incoming traffic, and load non-uniformity across output ports. Next, we considered buffer management strategies to support QoS functions, which utilize parameter values obtained via connection admission control (CAC) procedures to set tile threshold values. Through simulations, we showed that the buffer management schemes adopted behave well in the sense that they can protect regulated traffic from unregulated cell traffic in allocating buffer space. In particular, it was observed that dynamic partitioning is superior in terms of QoS support than virtual partitioning.

• Journal of the Korean earth science society
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• v.45 no.2
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• pp.136-146
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• 2024

This paper introduces the seismic facies classification and mapping of igneous bodies found in the sedimentary sequences of the Yellow Sea shelf area of Korea. In the research area, six extrusive and three intrusive types of igneous bodies were found in the Late Cretaceous, Eocene, Early Miocene, and Quaternary sedimentary sequences of the northeastern, southwestern and southeastern sags of the Gunsan Basin. Extrusive igneous bodies include the following six facies: (1) monogenetic volcano (E.mono) showing cone-shape external geometry with height less than 200 m, which may have originated from a single monogenetic eruption; (2) complex volcano (E.comp) marked by clustered monogenetic cones with height less than 500 m; (3) stratovolcano (E.strato) referring to internally stratified lofty volcanic edifices with height greater than 1 km and diameter more than 15 km; (4) fissure volcanics (E.fissure) marked by high-amplitude and discontinuous reflectors in association with normal faults that cut the acoustic basement; (5) maar-diatreme (E.maar) referring to gentle-sloped low-profile volcanic edifices with less than 2 km-wide vent-shape zones inside; and (6) hydrothermal vents (E.vent) marked by upright pipe-shape or funnel-shape structures disturbing sedimentary sequence with diameter less than 2 km. Intrusive igneous bodies include the following three facies: (1) dike and sill (I.dike/sill) showing variable horizontal, step-wise, or saucer-shaped intrusive geometries; (2) stock (I.stock) marked by pillar- or horn-shaped bodies with a kilometer-wide intrusion diameter; and (3) batholith and laccoliths (I.batho/lac) which refer to gigantic intrusive bodies that broadly deformed the overlying sedimentary sequence.

• Korean Security Journal
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• no.36
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• pp.255-292
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• 2013

Burglary (also called breaking and entering and sometimes housebreaking) is a crime, the essence of which is illegal entry into a building for the purposes of committing an offence. It is one of the most common types of crime and also a serious issue for every society. A house that is left insecure is an accessible and attractive target for burglars and therefore burglary resistance test & certification system for doors and windows has been developed in many countries. This paper explores several advanced foreign burglary resistance test/certifcation cases (the British SBD, the Dutch KOMO SKH/SKG, the Japanese CP mark, the Australian Standard Certification) for security products and domestic test/certification systems for fire safety products as a comparative study so that any improvement points can be gained for South Korea in the field of security product performance. The comparative analysis results show that South Korea is far behind the security product certification system and needs a lot of improvement in the system by benchmarking foreign cases. The domestic test/certification systems for fire safety products also give some insights for burglary-related security products' performance certification system in Korea. Overall, the need for relevant rules and regulations, the establishment of standards regarding testing and certification, including certified security +hardware product in building security certification system, performance testing as well as production testing (i.e. quality management system evaluation), the basic competency of testers, incentive system for certified/high quality security products were suggested in order to make an optimal model for the security production performance testing and certification system in Korea.

• Journal of Yeungnam Medical Science
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• v.17 no.2
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• pp.137-145
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• 2000

Background: Hepatocellular carcinomal(HCC) has been considered to be relatively radioresistant. The role of radiotherapy(RT) in the treatment of HCC is controversial. But RT has a role in the treatment of hepatocellular carcinoma as a single or combination modalities. The effect of radiotherapy on HCC was evaluated. Patients and Methods: From January 1984 through January 2000, a total of 18 patients with unresectable HCC underwent radiotherapy alone or in conjunction with transarterial embolization(TAE). We reviewed the medical ecords of patients treated with RT and measured the tumor size using measured the tumor size using planimetry method. The Kaplan-Meier method was used to calculate the survival rate. Results: The RT patients were 15 men and 3 women. The mean age was 51 years. four(22.2%) of them were accompanied with ascites. Eleven(61.1%) of them were accompanied with liver cirrhosis and their functions were 6, 3, 2 in each Child-Pugh A, B, C, respectively. A partial response(PR) was observed in 2 patients(11.1%), minimal response(MR) in 4 patients (22.2%) and no change(NC), in 11 patients(61.1%), whereas progressive disease(PD) was seen in 1 patients(6%), respectively. Conclusions: Although the radiotherapy in HCC did not improve the survival rate. it decreased the tmor size. Radiotherapy strengthens the therapeutic efficacy when combined with TAE, but more studies are needed.

• Investigative Magnetic Resonance Imaging
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• v.10 no.2
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• pp.81-88
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• 2006

Purpose : To evaluate the MR imaging findings of bowel wall thickening in patients with minimal to moderate cirrhosis, and analyze their clinical significances comparing with laboratory findings. Materials and Methods : We assessed retrospectively the MRI findings of 123 patients with minimal to moderate cirrhosis, and compared these with the clinical laboratory findings. We evaluated the involved sites and MR image findings of thickened bowel wall, as well as the presence of collateral vessels, ascites, and splenic size. These were compared with serum albumin and bilirubin levels, and prothrombin time. Results : Gastrointestinal wall thickening was detected at 37 sites in 25 patients (20%), and more frequently detected in moderate cirrhosis (29%) than in minimal cirrhosis (17%). Jejunum and ascending colon were the most common sites of bowel wall thickening; each was involved at 22 and 9 sites, respectively. Ascending colonic wall thickening was more commonly detected in moderate cirrhosis than in minimal cirrhosis. The thickened bowel wall showed symmetric contour, high signal intensity on T2-weighted images, mixed iso- and low signal intensity on T1-weighted images, and homogeneous or target-like enhancement. Serum albumin level was significantly lower in patients with bowel wall thickening ($3.3{\pm}0.9$ g/dl vs. $3.9{\pm}0.7$ g/dl; p=0.0024). Serum bilirubin level was significantly higher in patients with bowel wall thickening ($1.7{\pm}1.0$ mg/dl vs. $1.4{\pm}1.2$ mg/dl; p=0.0160). Bowel wall thickening did not significantly correlate with the presence of collateral vessels, ascites, splenic size, and prolongation of prothrombin time. Conclusion : In minimal to moderate cirrhosis, the MR imaging evaluation of bowel wall thickening was useful for estimating the severity of cirrhosis and laboratory findings.

• Proceedings of the Korean Nuclear Society Conference
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• 1997.05a
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• pp.581-586
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• 1997

중대사고시 노심의 손상에 의한 노심용융물이 원자로 용기 하부 반구로 재배치될 때 고온의 노심용융물에 의한 열적 부하로 원자로 용기의 파손을 일으키게 된다. 원자로 용기하부 반구 내에서의 노심용융물의 열적 거동 및 하부 반구에 대한 열적 부하에 대한 분석은 용융물의 성분 및 재배치 과정의 복잡성 등으로 인한 실험적 모사의 한계성 및 현상 분석의 난이함에도 불구하고 기존 원자로의 중대사고에 대한 안전 여유도의 제고와 이에 따른 노내외 사고 관리 전략의 수립을 위하여 연구의 필요성이 제기된다. 본 연구에서는 노심용융물 냉각연구(SONATA-IV)의 예비 실험으로 노심용융물의 상사물로 $Al_2$O$_3$/Fe Thermite 용융물을 이용하여 실제 원자로 용기 하부 반구를 1/8 로 선형 축소한 반구형 실험 용기로 주입하는 실험을 수행하였다. 아울러 원자로 용기 하부 반구로 재배치된 노심용융물에 의한 열적, 기계적 부하에 대한 분석을 수행하기 개발된 유한 요소 프로그램인 CALF (Computer Analysis for Lower Head Failure ) 코드를 이용한 하부 반구의 열적 거동에 대한 해석 결과를 정리하였다. 용융물 주입 실험 결과 용융물 주입과 동시에 하부 반구에 직경 5cm 크기의 하부 반구 파손이 발생하였다. 이는 고온 용융물에 의한 제트류(Jet Impingement)의 효과로 생각된다 동일한 조건에서 CALF 코드로 하부 반구의 열적 거동을 분석하였는데, 실험과는 달리 하부 반구의 파손이 발생하지 않았다 이같은 해석 결과는 용융물의 제트류 효과가 존재하지 않는다면 고온의 용융물이 하부 반구 내로 재배치되더라도 하부 반구의 파손이 발생하지 않는다는 것을 보여준다.>$_3$ 흡착제 제조시 TiO$_2$ 함량에 따른 Co$^{2＋}$ 흡착량과 25$0^{\circ}C$의 고온에서 ZrO$_2$와 $Al_2$O$_3$의 표면에 생성된 코발트 화합물을 XPS와 EPMA로 부터 확인하였다.인을 명시적으로 설명할 수 있다. 둘째, 오류의 시발점을 정확히 포착하여 동기가 분명한 수정대책을 강구할 수 있다. 셋째, 음운 과 정의 분석 모델은 새로운 언어 학습시에 관련된 언어 상호간의 구조적 마찰을 설명해 줄 수 있다. 넷째, 불규칙적이며 종잡기 힘들고 단편적인 것으로만 보이던 중간언어도 일정한 체계 속에서 변화한다는 사실을 알 수 있다. 다섯째, 종전의 오류 분석에서는 지나치게 모국어의 영향만 강조하고 다른 요인들에 대해서는 다분히 추상적인 언급으로 끝났지만 이 분석을 통 해서 배경어, 목표어, 특히 중간규칙의 역할이 괄목할 만한 것임을 가시적으로 관찰할 수 있 다. 이와 같은 오류분석 방법은 학습자의 모국어 및 관련 외국어의 음운규칙만 알면 어느 학습대상 외국어에라도 적용할 수 있는 보편성을 지니는 것으로 사료된다.없다. 그렇다면 겹의문사를 [-wh]의리를 지 닌 의문사의 병렬로 분석할 수 없다. 예를 들어 누구누구를 [주구-이-ν가] [누구누구-이- ν가]로부터 생성되었다고 볼 수 없다. 그러므로 [-wh] 겹의문사는 복수 의미를 지닐 수 없 다. 그러면 단수 의미는 어떻게 생성되는가\ulcorner 본 논문에서는 표면적 형태에도 불구하고 [-wh]의미의 겹의문사는 병렬적 관계의 합성어가 아니라 내부구조를 지니지 않은 단순한 단어(minim

• Proceedings of the Plant Resources Society of Korea Conference
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• 2002.11b
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• pp.76-76
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• 2002

무주나무(Lasianthus japonicus Miquel)는 일본, 대만, 중국 등에 분포하고 열대 및 아열대의 상록활엽수림에서만 자라는 것으로 알려져 있으며, 우리나라에는 제주도 남쪽계곡에만 분포하는 희귀식물이다. 무주나무는 현재 환경부 지정 보호야생식물로 보호되고 있으나 개체특성 및 자생지에 대한 정확한 조사가 이루어진 바 없다. 본 연구는 무주나무의 자생지 현황과 생육특성을 파악하고자 실시하였다. 무주나무의 자생지는 제주도 남제주군 남원읍 하례리 해발 250m의 계곡 동사면과 서귀포시 돈네코 계곡의 해발 350 m 계곡의 서사면 등 2개소로 확인되었다. 자생지별 개체수는 남원읍 하례리 4개체, 서귀포시 돈네코계곡 5개체 등 총 9개체에 불과하였다. 자생지는 계곡의 상록수림 하부에 바위 위 부엽토나, 습한 계곡 사면이었으며, 교목층에는 구실잣밤나무, 비쭈기나무, 황칠나무, 동백나무 등이 우점하고, 관목층에는 사스레피나무, 백량금, 산호수 등이 우점하는 상록활엽수림이었다. 분포 개체의 수고는 최소 0.4 m, 최대 1.55 m로 평균 1.5 m 였다. 생장특성을 조사한 결과 줄기는 어릴 때는 사각형이지만 점차 원형으로 되며, 일정한 마디가 있고 털이 없으며, 잎은 대생하고, 혁질이며, 중륵과 측맥이 뚜렷한 특성을 갖고 있었다. 열매는 장과형으로 성숙 시에는 남색이며 털이 없으며, 직경 약 6-7 mm, 4-5개의 종자가 들어 있었다. 종자는 반달형이며, 3개의 홈이 지는 특성을 갖고 있었다. 현재의 자생지는 자연적인 요인으로서 토양유실이 심하게 일어나고 있는 지역이었으며, 교목 또는 다른 관목에 의한 피압으로 무주나무의 생장에 부적절한 환경으로 판단되었다. 따라서 자생지의 적절한 식생관리와 지속적인 자생지 조사 및 자생지외 보존에 관한 연구가 이루어져야할 것으로 생각된다.$I_{NO}$ 가 죽절초를 제외한 3종에서 여름철 낮시간에 증가하였다. 겨울철의 O-J-I-P곡선은 모든 종에서 낮시간에 다소 낮아지지만 큰 변화는 없었다. 그리고, 문주란, 박달목서, 파초일엽에서 $\psi$o/(1-$\psi$o)가 낮시간에 다소 증가하였다. 이로부터 P $I_{NO}$ , SF $I_{NO}$ , $\psi$o/(1-$\psi$o)등의 변수는 식물의 활력도를 검정하는 지표로 활용될 가능성이 높다고 할 수 있다.irc}C$) 까지 동시에 냉각된 사실을 지시한다. 각섬석 편암내의 각섬석들은 복잡한 40Ar/39Ar 연대를 보여주며 일부가 평형연대를 보여주지만 특별한 의미 부여가 힘들다.해예방행동을 촉구하는 등의 효과도 높은 것으로 예방의학적인 유용성이 크다고 볼 수 있다. 미침을 알 수 있었다. 대두 단백질로 코팅된 golden delicious는 상온에서60일 동안 보관하였을 경우, 사과표피의 색도 변화를 현저히 지연시킴을 확인하였다. 또한 control과 비교하여 성공적으로 사과에 코팅하였으며, 상온에서 보관하여을 때 사과의 품질을 30일 이상 연장하는 효과를 관찰하였다. 이들 결과로부터 대두단백질 필름이 과일 등의 포장제로서 이용할 가능성을 확인하였다.로 [-wh] 겹의문사는 복수 의미를 지닐 수 없 다. 그러면 단수 의미는 어떻게 생성되는가\ulcorner 본 논문에서는 표면적 형태에도 불구하고 [-wh]의미의 겹의문사는 병렬적 관계의 합성어가 아니라 내부구조를 지니지 않은 단순한 단어(minimal $X^{0}$ elements)로 가정한다. 즉, [+wh] 의미의 겹의문사는 동일한 구성

• Journal of the Korean Society for Library and Information Science
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• v.30 no.2
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• pp.3-50
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• 1996

At present, Korean universities and colleges are confronted with a strong challenge, within and without, demanding a drastic change or innovation of university education. Discussion on the propulsion of the School Program is now under way as one of the means to reform the university education With such a background in mind, we have considered what should be the desirable course of Library and Information Science in Korea. We have considered the characteristic features and roles of library and information professionals to cope with the now approaching information society and the changing conditons of educational environment We have collected the pros and cons among professors of tile School Program, and investigated the curricula of the three universities which are at present practicing the School Program. Of the 139 professors to whom we have sent the questionnaries, $92(66\%)$ responded, of which the pros were 42 and the cons were 45. The model plan for the School Program is 'departmental school program' $(44\%)$, which purports to adopt 'departmental school program', with the curricula and material resources being utilized in common, or to adopt joint-appointment system with the common utilization of teaching materials and the introduction of a limited dual major system. The argument against introduction the School Program was that because of the peculiar nature of the discipline itself, Library and Information Science can not be merged with any other discipline.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.45 no.4
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• pp.41-49
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• 2008

H.264/AVC supports variable block motion compensation, multiple reference images, 1/4-pixel motion vector accuracy, and in-loop deblocking filter, compared with the existing compression technologies. While these coding technologies are major functions of compression rate improvement, they lead to high complexity at the same time. For the H.264 video coding technology to be actually applied on low-end / low-bit rates terminals more extensively, it is essential to improve tile coding speed. Currently the deblocking filter that can improve the moving picture's subjective image quality to a certain degree is used on low-end terminals to a limited extent due to computational complexity. In this paper, a performance improvement method of the deblocking filter that efficiently reduces the blocking artifacts occurred during the compression of low-bit rates digital motion pictures is suggested. In the method proposed in this paper, the image's spatial correlational characteristics are extracted by using the variable block information of motion compensation; the filtering is divided into 4 modes according to the characteristics, and adaptive filtering is executed in the divided regions. The proposed deblocking method reduces the blocking artifacts, prevents excessive blurring effects, and improves the performance about $30{\sim}40%$ compared with the existing method.

• Journal of the Korea Society of Computer and Information
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• v.15 no.7
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• pp.57-66
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• 2010

Due to the advancement of IPTV technologies, open IPTV services are a step closer to becoming reality. In such service environment, users are able to enjoy IPTV services using a variety of devices available at their home domain. However, it is impossible to get such flexible services at their convenience unless each of devices is individually connected to Set-Top-Box (STB) because of Conditional Access System (CAS) or service providers otherwise allow STB to freely distribute decoded contents to every user devices attached to STB. In this paper, we propose a key management scheme for securely distributing contents from STB to multiple user devices at home domain. The proposed scheme also makes the service providers be able to control the access rights to each of user devices without installing individual STBs. It is achieved by computationally dividing a private key of RSA signature scheme into three parts and thus makes possible to distribute the contents scrambled through a underlying CAS mechanism without re-encrypting them that the existing scheme should employ. It improves significantly computation and communication complexities, maintaining it as secure as the existing schemes. Additionally, it prevents misbehaving users from illegally distributing the contents from STB to their devices available at home domain.