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Real-Time White Spectrum Recognition for Cognitive Radio Networks over TV White Spaces
Kim, Myeongyu,Jeon, Youchan,Kim, Haesoo,Kim, Taekook,Park, Jinwoo The Korea Institute of Information and Commucation 2014 Journal of communications and networks Vol.16 No.2
A key technical challenge in TV white spaces is the efficient spectrum usage without interfering with primary users. This paper considers available spectrum discovery scheme using in-band sensing signal to support super Wi-Fi services effectively. The proposed scheme in this paper adopts non-contiguous orthogonal frequency-division multiplexing (NC-OFDM) to utilize the fragmented channel in TV white space due to microphones while this channel cannot be used in IEEE 802.11af. The proposed solution is a novel available spectrum discovery scheme by exploiting the advantages of a sensing signaling. The proposed method achieves considerable improvement in throughput and delay time. The proposed method can use more subcarriers for transmission by applying NC-OFDM in contrast with the conventional IEEE 802.11af standard. Moreover, the increased number of wireless microphones (WMs) hardly affects the throughput of the proposed method because our proposal only excludes some subcarriers used by WMs. Additionally, the proposed method can cut discovery time down to under 10 ms because it can find available channels in real time by exchanging sensing signal without interference to the WM.
Haesoo Kim,HongJin Jeon,JaeNam Bae,MaengJe Cho,SeongJin Cho,Hyochul Lee,JinPyo Hong 대한신경정신의학회 2018 PSYCHIATRY INVESTIGATION Vol.15 No.3
Objective The purpose of the present study was to investigate the association between Body Mass Index, suicide, perceived stress, and life dissatisfaction in a general population sample of Korean adults. Methods A total of 6,022 nationally representative adults aged 18 to 74 were selected using a multistage cross-sectional cluster sampling method. Questionnaires regarding suicide behaviors, perceived stress, and life satisfaction were completed by the participants. They also reported their heights and weights, which were used to calculate BMI. Psychiatric disorders were diagnosed according to the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, using the Korean version of the Composite International Diagnostic Interview. Results The results showed that being underweight was associated with higher risk for suicide ideation [odds ratio (OR), 1.6; 95% confidence interval (Cl), 1.18-2.05] and suicide attempt (OR, 2.0, 95% Cl, 1.23-3.31). Likewise, obesity also increased the risk of suicide ideation (OR, 1.3; 95% Cl, 1.11-1.56) although not suicide attempt. Furthermore, underweight individuals were more likely to report severe level of perceived stress (OR, 1.7; 95% Cl, 1.26-2.17) and life dissatisfaction (OR, 1.3; 95% Cl, 1.07-1.68). All of the results remained significant after adjusting for age, gender, education, and psychiatric illnesses. Conclusion This study found that being underweight is a significant risk factor for suicide and poor subjective wellbeing in Korea. It suggests that BMI status may be an important modifiable factor for improving mental health in Korea.
북한어판 알코올사용장애 진단검사(Alcohol Use Disorder Identification Test-North Korean version, AUDIT-NK)의 신뢰도와 타당도
김해수(Haesoo Kim),이소희(Soo Hee Lee),전진용(Jin Yong Jun),이태엽(Taeyeop Lee),한정미(Jeong Mee Han),안명희(Myung Hee Ahn,),최지희(Ji Hee Choi),홍진표(Jin Pyo Hong) 한국중독정신의학회 2016 중독정신의학 Vol.20 No.2
Objectives : The aim of the study was to develop North Korean version of Alcohol Use Identification Test and assess its reliability and validity. Methods : North Korean defectors (n=206) were recruited from North Korean counseling call center. Psychiatrists and psychiatric residents interviewed the participants. Psychiatric diagnosis were given to those who met criteria for Diagnostic and Statistical Manual of Mental Disorders-IV. Participants then completed the Alcohol Use Disorder Identification Test-North Korean version (AUDIT-NK), Center for Epidemio-logic Studies Depression Scale-North Korea (CES-D-NK), Impact of Event Scale-Revised-North Korea (IES-R-NK), and alco-hol section of Brief Psychological State Inventory for North Korean Refugees (BPSI-NKR-alcohol). After one week, the same questionnaires were administered to 131 participants to assess test-retest reliability. Results : Cronbach’s alpha value indicating internal reliability was 0.88 for AUDIT-NK. The test-retest cor-relation coefficient was 0.91. Pearson correlation coefficient be-tween AUDIT-NK and BPSI-alcohol was 0.80 for males and 0.71 for females, indicating high convergent validity. Good dis-crimination and validity of AUDIT-NK were evident based on its low correlation with CES-D-NK (males, 0.16 ; females, 0.00) or IES-R-NK (males, 0.16 ; females, 0.03). Conclusion : AUDIT-NK is a valid and reliable measure to assess symptoms of alcohol use disorder in North Korean refugees.
유기동물 문제 해결을 위한 소셜 미디어 플랫폼 ‘집사랑’ 제안
김해수(Haesoo Kim),김혜인(Hyein Kim),박혜정(Hyejung Park),석민창(Minchang Seok) 한국HCI학회 2020 한국HCI학회 학술대회 Vol.2020 No.2
본 연구는 저조한 유기동물 입양 현황에 대한 문제 인식 및 분석을 바탕으로 유기동물에 대한 인식 개선 및 입양 장려를 위한 해결책을 제시하고자 한다. 이를 위해 현재 활용되고 있는 유기동물 관련 플랫폼 조사, 사용자 조사 및 전문가 인터뷰 등의 분석 결과를 바탕으로 반려동물 중심의 소셜 미디어 플랫폼인 ‘집사랑’을 유기동물의 입양률 저조 및 부정적 인식 문제에 대한 해결 방법으로 제안하고자 한다.