• 한국콘텐츠학회논문지
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• 제6권6호
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• pp.56-63
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• 2006

키 복구 연구는 많은 논란에도 불구하고 연구가 확대되고 있는 주제로서, 키 관리의 형태로 법인차원에서 필요하게 되었다. 네트워크에 연결된 시스템들은 TCP/IP의 인터넷 IP 계층에서 키 복구를 도입하여 사용하고 있다. IETF 프로토콜 중 IPSec은 인터넷의 네트워크 계층에서 IP 메시지에 대하여, 암호화 서비스와 인증 서비스를 제공하는 보안 프로토콜이다. 본 논문은 IETF의 인터넷 표준 구조와 호환되게 키 복구 정보를 포함하는 데이터를 전송하는 방법을 제안하고 있다.

• 한국정보시스템학회지:정보시스템연구
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• 제18권3호
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• pp.111-134
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• 2009

Today many owners of Web sites are looking to user's satisfaction survey as a key means of measuring the usability of a Web site. While it is preferred for it simplicity and ease of use, this survey method is not without potential risks. This paper focuses on showing that the existing practice of questionnaire-based usability measurement is subject to human recall errors, and that such flaws can be reduced when the questionnaire survey is followed by the users hands-on experience of the site. An empirical study was conducted, and the results indicate that the above speculation holds true. Even if respondents felt highly confident about their responses on a recall survey, a hands-on experience with a focal Web site increased the extent to which the respondents were satisfied with the shopping mall site. This indicates that a user's perception of the quality of a Web site may be distorted or lost as time goes by. In addition, the findings have shown that the use of the verbal protocol analysis method can reveal critical information that can help track the root causes of Web site usability problems, thereby helping to develop site enhancement strategies. The paper concludes with directions for future research.

• 한국정보과학회논문지:정보통신
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• 제36권5호
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• pp.383-388
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• 2009

본 논문에서는 IR-UWB(Impulse Radio Ultra Wide Band) 통신에서 패킷 전송이 실패하였을 경우에 그 원인을 알아보고 이에 맞는 최선의 재전송 프로토콜을 제안한다. 최근 많이 연구되고 있는 IR-UWB 통신에서는 시간 호핑이라는 기능을 사용하면 동시에 여러 사용자가 패킷을 충돌 없이 전송할 수 있는 특징이 있다. 제안하는 이기적 재전송 프로토콜은 패킷 전송 실패를 탐지한 후 타임아웃이나 채널 탐색 없이 이기적으로 재전송을 수행하며, 채널을 효율적으로 사용하여 전체처리율을 50%까지 높이고 재전송시의 패킷 지연 시간을 70%까지 줄이는 효과가 있음을 시뮬레이션을 통하여 검증하였다.

• 대한한의진단학회지
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• 제19권2호
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• pp.91-100
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• 2015

Objectives The aim of this study is to develop a structured clinical protocol related with acquisition of radial pulse wave in the randomized, $2{\times}2$ cross-over design, and cold-heat intervention trial for a pilot and preliminary study. Methods The protocol was contrived based on wide ranging literature searches for cold-heat intervention experiments and radial pulse diagnoses. Results Sample size of 60 subjects was calculated based on an effect size derived from the previous study designed to detect the pre-post cold-heat differences in the radial pulse. Each subjects will be randomly assigned to the cold (first) to heat (last) group (n=30) or heat (first) to cold (last) group (n=30). All subjects will fill out a case report form and questionnaires related with pattern identification, dietary patterns, sleep quality, and physical activity will be surveyed and used as a secondary outcomes. Safety assessment will be reported at the final stage. Conclusions This protocol will provide an additional reference to future studies related with observation of radial pulse during any interventions and also expect to be used as a guideline for acquisition of reliable radial pulse wave data.

• 인터넷정보학회논문지
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• 제9권2호
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• pp.83-88
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• 2008

SIP(Session Initiation Protocol)는 인터넷상에서 멀티미디어 세션을 시작하고 컨트롤하기 위한 응용계층 프로토콜이다. SIP 서비스를 사용하기 위해 클라이언트는 서버로부터 우선 사용자 인증을 받아야 한다. 일반적으로 인증이란 통신 상대방이 제공하는 네트워크 서비스에 접근하기 위해 자신의 신원을 검증받는 과정을 말한다. 2005년, Yang 등은 SIP 응용을 목적으로 Diffie-Hellman 프로토콜에 기반한 키 교환 및 인증 방식을 제안하였다. 그러나 Yang 등이 제안한 방식은 상당한 양의 계산을 필요로 하기 때문에 계산능력이 떨어지는 클라이언트나 서버로 구성된 네트워크 환경에서 사용하기에는 부적합하다는 단점을 가지고 있다. 이에 Huang과 Wei는 최근 Yang 등이 제안한 방식을 개선하여 효율성을 증대시킨 새로운 키 교환 및 인증 방식을 제안하고 이의 안전성을 주장하였다. 하지만 본 논문에서는 Huang-Wei가 제안한 키 교환 및 인증 방식이 사전공격과 전방향 비밀성에 취약함을 보인다.

• 한국치위생학회지
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• 제17권6호
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• pp.1067-1080
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• 2017

Objectives: This study analyzed the perception towards clinical practice education content held by dental hygiene students in dental institutions and their perceived importance of dental hygienists' clinical duties. Methods: The subjects of this study were 182 dental hygienists who were working at dental institutions in Seoul, Gyeonggi, and Chungcheong areas. A survey was conducted with a self-administered questionnaire. In the questionnaire, the clinical practice contents were classified into observation, preparation, and performance, and the importance of clinical duty was measured with a 3-point scale. For the clinical practice contents and the importance of duty, descriptive statistics and chi-square test were performed, and the study results were analyzed using STATA 11.0. Results: With regard to clinical practice contents, observation was mainly performed in oral & maxillofacilal radiology, preventive dentistry, periodontal medicine and oral medicine. In primary care and infection control, practice and observation were mainly performed. In the department of orthodontics and pediatric dentistry, observation and preparation were mainly conducted, while in oral surgery, conservative dentistry observation, preparation and practice were all conducted. With regard to clinical practice contents according to the dental institution, there were statistically significant differences in the type of dental institution and the duty (p>0.05). In terms of the importance of dental hygienist's duty, infection control, toothbrushing education for each patient, removal of plaque, and patient education after surgery were considered important. Conclusions: For clinical practice of the dental hygiene department, the education contents should be standardized in accordance with the importance of the dental hygienist's duty, a protocol for operation of practice should be developed, and a method of standardization of evaluation should be sought in the future.

• 한국의류학회지
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• 제21권8호
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• pp.1323-1333
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• 1997

The objectives of this study were to identify 1) the steps of information processing and evaluation in clothing purchase decision making, 2) evaluative criteria and determinant attributes at each step, 3) decision making rule, and 4) the effect of clothing involvement on information processing and evaluation. The data were obtained 71 female adults using questionnaire, observation and protocol in real shopping behavior. Consumer's information processing and evaluation was a circulated process composed of multi-steps. Consumer considered aesthetic and intrinsic evaluative criteria to be important and used compensatory and noncompensatory rule together at each decision making step. Clothing involvement had an partial effect on information processing and evaluation.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제49권1호
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• pp.21-29
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• 2023

Objectives: Dental or maxillofacial emergencies are uncommon during pregnancy, but if they occur, they are challenging to treat due to potential risks. The mother should not be denied necessary medical or dental care because of pregnancy. The aim of the study is to observe outcomes of pregnancy in patients requiring emergency minor oral surgical procedures during gestation and to determine the safety of the pregnant woman undergoing the procedure and the fetus. Materials and Methods: The study was conducted on 52 pregnant women requiring emergency oral surgical procedures. A standard treatment protocol for treatment of specific entities was followed. Close monitoring and observation were the primary goal of treatment. All patients were followed postoperatively until complete recovery from the surgical procedures and then until birth of the baby. A control group of 52 healthy pregnant patients who did not require oral surgical procedures was considered for statistical analysis. The measurements to calculate observation were fetal loss (spontaneous abortion), preterm birth, low-birth weight, or incidence of any congenital anomalies in the baby and its association with surgical procedures. Results: No fetal loss occurred in any of the cases. However, four patients experienced preterm birth and seven neonates exhibited low birth weights. No congenital abnormalities were discovered. In one instance, a patient who underwent surgery for a mandibular symphysis fracture under general anesthesia in the 31st week of pregnancy experienced labor pain on the fourth postoperative day, requiring an emergency Caesarean section. Conclusion: The results of our study demonstrate that, compared to the control group, minor emergency surgeries performed during pregnancy have no discernible negative effects on the fetus. These procedures can safely be performed by adhering to our described protocols.

• 전자공학회논문지
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• 제50권4호
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• pp.97-107
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• 2013

수중무선통신시스템은 AUV간 수중 무선통신, 해양환경 모니터링, 양식장 관리, 항만 감시, 자원 탐사 및 개발, 지형 및 지질 조사 등 다양한 산업에 활용 가능하다. 하지만 수중 무선 통신은 지상 무선 통신과는 달리 물이 가지고 있는 매질의 특성때문에 전력손실, 주위 잡음 및 인위 잡음, 멀티패스 등으로 인한 높은 에러율 그리고 긴 전송지연 등과 같은 요소들을 고려하여야 한다. 따라서 본 논문에서는 ALOHA 기반의 Media Access Control(MAC) 프로토콜과 CSMA/CA 기반의 MAC 프로토콜을 혼합하여 수중 환경에 적합한 MAC 프로토콜을 제안한다. 성능을 평가하기 위해 수학적 분석 모델을 제시하고, 구현을 통해 기존 MAC 프로토콜과 비교함으로써 성능의 개선점을 검증한다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제45권4호
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• pp.207-214
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• 2019

Objectives: Medically compromised patients often fear required dental surgical procedures that can increase the risk of medical emergency when combined with reduced tolerance for stress. A stress reduction protocol (SRP) helps doctors minimize treatment-related stress and improves patient management with minimum complications. Diabetes and co-morbid hypertension carry 4-fold risk of aggravation of cardiovascular emergencies and 7.2-fold risk of mortality. Diabetic neuropathy can result in difficult diagnosis of myocardial infarction and reduces chances of surviving a myocardial infarction compared with a non-diabetic person. The aim of the study was to assess the feasibility of a protocol for management of patients having both diabetes and hypertension who required minor oral surgery to minimize the rate of cardiovascular emergencies. Materials and Methods: A prospective study was conducted in 140 patients having both diabetes and hypertension who required minor oral surgical procedures. A systematic approachable protocol was designed for management of such patients. Results: Among 140 patients, 6 patients (4.3%) had cardiovascular complications, while 3 patients (1 with syncope and 2 with hypertension) did not require any intervention other than observation. Two patients were managed with aspirin and nitroglycerin, and 1 patient had possible myocardial infarction (overall incidence 0.7%) with chest pain, S-T segment elevation on electrocardiogram, and troponin level of 0.60 ng/mL. Conclusion: The proposed protocol helps to improve management of patients having both diabetes and hypertension. We recommend that patients with uncontrolled diabetes and uncontrolled hypertension and/or patients having history of cardiovascular complication should be treated in a medical facility with a readily available cardiology unit. This facilitates prompt response to emergency and instant implementation of treatment, helping to reduce morbidity and mortality.