초음파 내시경 유도 하 경식도 배액술로 치료한 종격동 침범 췌장 가성 낭종

김효정 ( Hyo Jung Kim ),김명환 ( Myung Hwan Kim ),박도현 ( Do Hyun Park ),권혜미 ( Hye Mi Kwon ),박소정 ( So Jung Park ),최은지 ( Eun Ji Choi ),최준혁 ( Joon Hyuk Choi ),김형중 ( Hyoung Jung Kim ) 대한췌장담도학회 2014 대한췌담도학회지 Vol.19 No.3

Pancreatic pseudocyst is a common complication of acute/chronic pancreatitis, but extension of a pancreatic pseudocyst into the mediastinum is a rare occurrence. In this report, we described a case of a 62-year-old male with necrotizing pancreatitis presenting with chest pain and dysphagia caused by a mediastinal pseudocyst. Endoscopic retrograde pancreatography revealed pancreatic duct disruption and leaks. A mediastinal pseudocyst was successfully drained by endoscopic ultrasound (EUS)-guided transesophageal approach. Chest pain and dysphagia disappeared swiftly with drainage. Associated pancreatic pseudocyst at tail was managed by EUS-guided cystogastrostomy and pleural effusion was controlled by percutaneous drainage, respectively. In a follow-up period of 3 months, there has been no recurrence of symptoms and signs. Although currently EUS-guided transesophageal approach was done in the selected cases, this procedure is technically feasible, less invasive and more effective than surgical approach.

균일한 길이 데이터 집합의 분할분배방식

김희원,김형중,이정문,Kim, Hee-Won,Kim, Hyoung Joong,Lee, Jung-Moon 강원대학교 산업기술연구소 1995 産業技術硏究 Vol.15 No.-

This paper presents a new method for load distribution in a single-level tree network equipped with front-end processors. This method focuses on effective data distribution over a number of processors minimize job processing time. Optimal multiple installment load distribution algorithm is presented. Minimum number of processors that maximizes efficiency is decided theoretically.

키 높이 깔창이 신체전반의 기능변화에 미치는 영향

정주현(Jung Ju-Hyeon),김지은(Kim Ji-Eun),문연이(Moon Yeoun-Yi),김형중(Kim Hyoung-Joong),심제명(Shim Je-Myung) 한국체육과학회 2009 한국체육과학회지 Vol.18 No.2

Purpose : The purpose of this study was to investigate the effect of functional change of the whole body to wear hidden increaser. Subject : We examed 21 students undergraduate in M college who had healthy male. Experimental group of ten subjects weared hidden increaser. Control group of eleven subjects. Method : First of all, Balance test was operated unilateral stance test and functional reach test(FRT). Functional reach test(FRT) was divided to the whole surface and the side surface. Sensory test was operated to two point discrimination, tactile sense test and sense of position test. The last, range of motion(ROM)test of ankle was operated goniometer. Results : The results were as follows; 1) It showed significantly differences between pre and post test on experimental group in FRT heel up test and FRT heel down test(p<.05), also pre-post variation at heel up test showed significantly difference on experimental group(p<.05). 2) The LRT test showed significantly differences between pre and post test on experimental group(p<.05). 3) The range of motion(ROM) test showed significantly differences between pre and post test on experimental group, also pre-post variation at range of motion test showed significantly difference on experimental group(p<.05). 4) It showed significantly differences between pre and post on experimental group in two-point discrimination and sense of position test(p<.05), also pre-post variation at two-point discrimination and sense of position test showed significantly difference on experimental group(p<.05). Coclusion : When experimental group wore hidden increaser for 4 weeks, the balance ability of experimental group was more decreased than control group, two point discrimination and sense position test was decreased and range of motion(ROM)of ankle test was increased, but, tactile sense test was not changed at sense ability. The result suggest that long time experience in wearing hidden increaser may be caused sensory change, decreased balance ability and range of motion change.

Note on the Partial Sum Problem Mapping into a Hypercube

이정문(Jung Moon LEE),김형중(Hyoung Joong KIM) 대한전기학회 1990 대한전기학회 학술대회 논문집 Vol.1990 No.11

철골공사의 품질관리 업무 프로세스 모델 개발

김종성,김형중,변은정,구교진,현창택,Kim, Jong-Seong,Kim, Hyoung-Joong,Byun, Eun-Jung,Koo, Kyo-Jin,Hyun, Chang-Taek 한국건설관리학회 2007 건설관리 : 한국건설관리학회 학회지 Vol.8 No.3

건축물이 고층화, 대형화되면서 철골구조를 기본골조로 채택하는 경우가 많아지고 있으며, 철골공사의 품질관리는 사전계획단계부터 이루어지며, 단계별 참여자간의 업무 구분 및 연계가 매우 중요하다 이에 본 연구는 철골공사의 품질관리를 보다 원활하게 수행하기 위하여, 기존 철골공사 품질관리업무를 기반으로 업무간 상호관계 및 입출력 정보를 고려한 품질관리 업무 프로세스 모델을 개발하고자 한다. As higher and bigger buildings, steel structure is so for a basic building structure. Quality management of the steel frame work is started from pre plan phase. And classification and relation of works is very important in quality management. The purpose of this study is developing a quality management model for the better quality management in a steel frame work. This model consider a interrelationship of works and $input^{\circ}{\S}utput$ information, and based on the actual condition of current quality management.

전기기계 설계용 병렬솔버 개발

김형수(Hyung Soo Kim),김형중(Hyoung Joong Kim),최경(Kyung Choi),이향범(Hyang Beom Lee),정현교(Hyun Kyo Jung),한송엽(Song-yop Hahn) 대한전기학회 1995 대한전기학회 학술대회 논문집 Vol.1995 No.11

자궁육종 40예의 예후인자 분석

최종열 ( Jong Yeol Choi ),김형중 ( Hyoung Jung Kim ),어완규 ( Wan Kyu Eo ),김흥열 ( Heung Yeol Kim ) 대한산부인과학회 2006 Obstetrics & Gynecology Science Vol.49 No.6

Objective: Uterine sarcomas are rare tumors of mesodermal origin and constitute 2-6% of uterine malignancies. They are the most malignant group of uterine tumors and present difficult problems with regard to diagnosis and treatment. The aim of this study is to investigate the clinicopathologic finding and outcome of patients with uterine sarcoma. Methods: From Jan. 1996 to Dec. 2004, 40 patients with histologically proven uterine sarcomas at Gospel Hospital were evaluated for their clinical profile and survival retrospectively. Results: The age of patients with uterine sarcoma ranged 28 to 71 years, and the mean age was 48.0 years. The common presenting symptoms were abnormal uterine bleeding, abdominal pain and lower abdominal palpable mass. The overall 5-year survival rate of uterine sarcoma was 48.9% and the mean survival time was 73.6 months. The overall 5-year survival rate of 24 patients less than 50 years was significantly better than that of 16 patients more than 50 years, 69.1% vs 24.6% (P=0.0139). When classified according to histologic type, there were 21 cases (52.5%) of leiomyosarcoma (LMS), 8 cases (20.0%) of endometrial stromal sarcoma (ESS), 10 cases (25.0%) of malignant mixed mullerian tumors (MMMT) and 1 case (2.5%) of liposarcoma. The overall 5-year survival rate of MMMT was significantly worse than that of LMS and ESS, 26.7% vs 49.0% and 100.0%, respectively (P=0.0423). Classifying according to the FIGO surgical staging criteria, we found the following distribution; stage I of 26 cases (66.7%), stage II of 4 cases (10.3%), stage III of 5 cases (12.8%) and stage IV of 4 cases (10.3%). The overall 5-year survival rate of stage I and II was significantly better than stage III and IV, 61.8% vs 11.1% (P=0.0011). The overall 5-year survival rate of 14 patients less than 10 mitotic figures per 10 high-power microscopic fields had a tendency to good prognosis than that of 13 patients more than 10 mitotic figures per 10 high-power microscopic fields, 83.9% vs 38.5% (P=0.0568). The overall 5-year survival rate of 6 patients less than 35 U/mL of CA-125 had a tendency to good prognosis than that of 12 patients more than 35 U/mL of CA-125, 83.3% vs 20.8% (P=0.0580). However, menstrual status and treatment modality were not significant prognostic factors. Conclusions: Uterine sarcoma are aggressive tumors with a poor prognosis. Age, histologic type, and stage were statistically significant prognostic factors for overall survival in uterine sarcomas.

DNF 정책을 가지는 속성 기반 서명

이광수(Kwangsu Lee),황정연(Jung Yeon Hwang),김형중(Hyoung-Joong Kim),이동훈(Dong Hoon Lee) 대한전자공학회 2009 電子工學會論文誌-CI (Computer and Information) Vol.46 No.1

속성 기반 서명(Attribute-Based Signature) 기법이란 서명자의 비밀키에 속성 집합(Attribute Set)이 연관되고 서명에 접근구조(Access Structure)가 연관되는 서명 기법이다. 속성 기반 서명 기법은 객체의 식별자가 속성 집합으로 표현되는 속성 기반 시스템(Attribute-Based System) 또는 권한 기반 시스템(Role-Based System)에서 서명자의 익명성과 접근 제어를 가능하게 하는 유용한 서명 기법이다. 본 논문에서는 속성 기반 서명 기법을 정의하고 서명에 포함되는 정책을 DNF(Disjunctive Normal Form) 수식으로 표현이 가능한 효율적인 속성 기반 서명 기법을 제시한다. 제시한 기법은 서명 검증시 상수번의 페어링 연산만이 필요한 최초의 안전한 기법이다. 그리고 증명이 가능한 속성 기반 서명 기법을 구성하기 위해서 새로운 interactive 가정을 소개하고 제안된 기법이 랜덤 오라클과 새로운 가정에서 안전함을 보인다. An attribute-based signature scheme is a signature scheme where a signer's private key is associate with an attribute set and a signature is associated with an access structure. Attribute-based signature schemes are useful to provide anonymity and access control for role-based systems and attribute-based systems where an identity of object is represented as a set of roles or attributes. In this paper, we formally define the definition of attribute-based signature schemes and propose the first efficient attribute-based signature scheme that requires constant number of pairing operations for verification where a policy is represented as a disjunctive normal form (DNF). To construct provably secure one, we introduce a new interactive assumption and prove that our construction is secure under the new interactive assumption and the random oracle model.

대장직장암에서 p27<SUP>Kip1</SUP> 단백 발현과 임상병리학적 예후인자와의 관계

홍범기(Bum Ki Hong),김형중(Hyoung Joong Kim),이태진(Tae Jin Lee),박용검(Yong Gum Park),지경천(Gyung Cheon Ji),장인택(In Taik Chang),박성일(Seung Il Park),이정효(Jung Hyo Lee) 대한외과학회 2001 Annals of Surgical Treatment and Research Vol.60 No.5

CCA 안전성을 제공하는 ID기반 프락시 재암호화 기법

구우권(Woo Kwon Koo),황정연(Jung Yeon Hwang),김형중(Hyoung-Joong Kim),이동훈(Dong Hoon Lee) 대한전자공학회 2009 電子工學會論文誌-CI (Computer and Information) Vol.46 No.1

ID기반 재암호화 기법(ID-based proxy re-encryption scheme)은 사용자 간의 복호 능력 위임을 가능하게 하며 분산 데이터 저장, DRM, 이메일 전달 시스템 등의 다양한 분산 암호시스템을 위해 활발히 연구되고 있다. 최근 재암호화키 생성의 비상호성(Non-interactivity)을 제공하는 기법이 Green과 Ateniese에 의해 제안되었다. 이 기법은 선택 암호문 공격에 대한 안전성을 제공하기 위해 설계되었다. 본 논문에서는 Green-Ateniese ID기반 재암호화 기법이 근본적으로 사용자 키 노출 공격에 취약함을 보이고 선택 암호문 공격에 대한 안전성이 보장되지 않음을 증명한다. 그리고 이러한 보안 취약점을 해결하는 새로운 두가지 ID기반 재암호화 기법들을 제안한다. 제안 기법들이 랜덤 오라클 모델(Random Oracle Model)에서 단순 평문 공격과 선택 암호문 공격에 대해 각각 안전함을 증명한다. 선택 암호문 공격에 안전한 제안 기법을 구성하기위해, 본 논문에서는 최초로 짧은 서명에 기반한 자가 인증 기법을 고안하여 적용한다. 제안 기법의 중요한 특징은 재암호화 후 암호문의 구조가 유지되는 것이다. 따라서 이전 기법들과는 대조적으로 암호문 확장이 발생되지 않는다. 또한 재암호화의 횟수에 제한이 없어서 연속적인 암호문 변환이 가능하여 다중의 사용자를 위한 복호 능력 위임을 구현할 수 있다. A proxy re-encryption scheme allows Alice to temporarily delegate the decryption rights to Bob via a proxy. Alice gives the proxy a re-encryption key so that the proxy can convert a ciphertext for Alice into the ciphertext for Bob. Recently, ID-based proxy re-encryption schemes are receiving considerable attention for a variety of applications such as distributed storage, DRM, and email-forwarding system. And a non-interactive identity-based proxy re-encryption scheme was proposed for achieving CCA-security by Green and Ateniese. In the paper, we show that the identity-based proxy re-encryption scheme is unfortunately vulnerable to a collusion attack. The collusion of a proxy and a malicious user enables two parties to derive other honest users' private keys and thereby decrypt ciphertexts intended for only the honest user. To solve this problem, we propose two ID-based proxy re-encryption scheme schemes, which are proved secure under CPA and CCA in the random oracle model. For achieving CCA-security, we present self-authentication tag based on short signature. Important features of proposed scheme is that ciphertext structure is preserved after the ciphertext is re-encrypted. Therefore it does not lead to ciphertext expansion. And there is no limitation on the number of re-encryption.