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Jung Hyeonjong,Lee Dong‐Hwa,Cheong Do Young 한국증권학회 2022 Asia-Pacific Journal of Financial Studies Vol.51 No.5
We assume a hypothetical defined benefit (DB) pension plan that reflects the characteristics of the occupational pension in South Korea and propose a surplus optimization strategy using a regime-switching model. Using conditional surplus at risk, we construct an optimized portfolio that limits extreme tail risks. Furthermore, we identify the surplus risk and return conditional on global macroeconomic status using a hidden Markov model. The main results are that the DB pension portfolio should move from principal-protected products to diverse capital market products, and the DB pension portfolio using the regime-switching model outperforms an unconditional static portfolio.
S-Parameter를 이용한 변압기의 고주파 모델링 기법
정현종(Hyeonjong Jung),윤석(Seok Yoon),김유선(Yuseon Kim),배석(Seok Bae),임영석(Yeongseog Lim) 한국전자파학회 2018 한국전자파학회논문지 Vol.29 No.9
연구는 S-parameter를 이용한 변압기의 고주파 모델링 방법을 제시한다. 1차측과 2차측을 단락 또는 개방 회로를 구성하여 각 상태에서의 반사계수를 Vector Network Analyzer로 측정하였다. 측정 결과로부터 등가회로 소자를 추출하여 고주파 등가회로를 모델링하고, 2-port 회로에서 측정한 S-parameter 측정치와 시뮬레이션 결과를 비교함으로써 타당성을 검증하였다. 이는 정확하고 예측 가능한 고주파 변압기를 설계하는데 적용될 수 있다. In this paper, we propose a method for high-frequency modeling of transformers using the S-parameter. The open and short circuits of the primary and secondary sides were configured, and the reflection coefficient in each circuit was measured using a vector network analyzer. The equivalent circuit elements were extracted from the measured results to model the high-frequency equivalent circuit, and the validity of the method was verified by comparing the measured S-parameters in a 2-port network with the simulation results.
Fundamental understandings of mesh process and various formats of digital data in digital dentistry
Lee So-Hyoun,Jung Chang-Mo,Yoon Mi-Jung,Huh Jung-Bo,Lee Hyeonjong 대한치과이식(임프란트)학회 2021 The Korean Academy of Implant Dentistry Vol.40 No.1
Clinicians manage three-dimensional (3D) data in routine practice in the era of digital dentistry. Fundamental knowledge of digital data beyond the user’s manual provided by the companies is needed to understand and handle the 3D data in clinics. The 3D data used in the clinic are acquired by scanners and processed using a step-by-step procedure. A point cloud is an initial form of raw data. The data are then filtered, and a triangle mesh is generated. The meshes could be exported in various file formats. This fundamental knowledge would be helpful for clinicians in daily practice.
Jeongjin Park,HyeonJong Jung,YoungGab Kim 대한인간공학회 2015 대한인간공학회 학술대회논문집 Vol.2015 No.10
Objective: The aim of this development is to improve the human performance of employee in nuclear power plant each group and to internalize human performance tools in early stage. Background: Human error caused severe events and issued in NPP. So, most nuclear power plants are using human performance tools to enhance human performance. Human performance tools consisted of following 16 tools; Task Review, Job Site Review, Questioning Attitude, Stop When Unsure, Self-Checking, 3-Way Communication, Phonetic Alphabet, Procedure Use and Adherence, Pre-Job Briefing, Concurrent Verification, Independent Verification, Peer Checking, Flagging, Placekeeping, Turnover, Post-Job Critique. Lecture material includes these all tools. However, prior lecture material of human performance tools is too difficult and boring because they are text-oriented and not systematic. Especially, there is no classification by lecture group (such as new employee, operation team, maintenance team and etc.) Method: The lecture material needs to be customized by training target group. So, we divide following 5 groups; new employee, operation team, maintenance team, maintenance partner companies and experts. Because there is different about understanding level and application method in each group, we use video clip and actual examples to help that they can be easily understanding human performance tools. Results: To effective learning of human performance tools, video clip and actual examples will be helpful. But human performance tools are not trained once. So, Periodic update of video clip and actual examples is required. Conclusion: Human performance tools are powerful technique to prevent human error in NPP. So, effective learning program and lecture material must be developed consistently. Application: The standard lecture material will be distributed to each training center and NPP and used in human performance enhancement training course.
Kim, Amy,Lee, Jung-Bok,Ko, Yousun,Park, Taeyong,Jo, Hyeonjong,Jang, Jin Kyoo,Lee, Kyoungsuk,Kim, Kyung Won,Lee, In-Seob The Korean Gastric Cancer Association 2022 Journal of gastric cancer Vol.22 No.2
Purpose: Weight loss and deterioration in body composition are observed in patients with gastric cancer (GC) following gastrectomy. This study aimed to investigate the impact of residual stomach volume (RSV) on the nutritional status and body composition of patients with GC treated with distal gastrectomy. Materials and Methods: In total, 227 patients who underwent minimally invasive distal gastrectomy with Billroth 1 anastomosis for stage I GC between February 2015 and May 2018 were enrolled. Clinicodemographic and laboratory data were collected from the GC registry. The RSV, abdominal muscle area, and subcutaneous/visceral fat areas were measured using computed tomography data. Results: A larger RSV was associated with a lower decrease in the nutritional risk index (P=0.004) and hemoglobin level (P=0.003) during the first 3 months after surgery, and better recovery at 12 months. A larger RSV demonstrated an advantage in the preservation of abdominal muscle area (P=0.02) and visceral fat (P=0.04) after surgery, as well as less reduction in weight (P=0.02) and body mass index (P=0.03). Conclusions: Larger RSV was associated with improved nutritional status and better preservation of muscle and fat after distal gastrectomy.
치은연하 변연을 가지는 맞춤형 지대주에서 디지털 중첩기술을 이용한 인상채득술의 임상 적용 증례
김진완,정창모,윤미정,이소현,이현종,허중보,Kim, Jin-Wan,Jeong, Chang-Mo,Yun, Mi-Jung,Lee, So-Hyoun,Lee, Hyeonjong,Huh, Jung-Bo 대한치과보철학회 2020 대한치과보철학회지 Vol.58 No.2
임플란트 상부 보철물 제작 시 치은연하 변연을 가지는 맞춤형 지대주의 인상채득을 위해 전통적으로 치은 압배술이 실시되어 왔다. 하지만 치은 압배술은 치은 퇴축 등의 부작용이 있으며 출혈은 부정확한 인상채득의 원인이 될 수 있다. 본 증례에서는 이러한 문제점들을 해결하기 위해 보철물을 제작할 때 중첩 가능하도록 제작된 맞춤형 지대주를 이용하는 새로운 방법을 적용하였다. 지대주를 임플란트에 연결하기 전 형상데이터를 저장하고, 임플란트에 연결 후 치은 압배 과정 없이 광학 인상채득한 뒤 두 데이터를 중첩하여 상부보철물을 제작하였다. 치은 연하 변연을 가지는 임플란트 보철물 제작 시 심미성을 만족시키면서 기존의 인상채득 방식보다 빠르고 간편하며 우수한 변연 및 내면적합도를 보였기에 임상적 효용성에 대해 보고하고자 한다. Traditionally, gingival retraction has been performed to obtain customized abutment impressions with subgingival margins of the implant supported prosthesis. However, gingival retraction may have side effects such as gingival recession and bleed, leading to an inaccurate impression. In order to prevent these problems, in this case, the new technique has been introduced; a customized abutment which is designed for superimposition is used. Before the connection of the abutment to the implant fixture, pre-scanned shape data are stored, and then the optical impression without gingival retraction is obtained after connecting to the fixture. The suprastructure is fabricated by superimposing the two data. This technique showed the clinical efficacy of fabricating the implant supported prosthesis with subgingival margin, which satisfied the aesthetics, convenience, and clinically acceptable marginal and internal fit.